Methods and apparatus for use in a wireless communications system that uses a multi-mode base station
Abstract
This record has no abstract on file.
Term
Term ended
Projected expiry passed 15 September 2026, 0 years ago.
- Priority
- Filed
- Published
- Projected expiry
- Today
1 claim: 1 independent, 0 dependent
- 1Patent claims Zastrzeżenia patentowe 1. The way the base station works, including:1. Sposób działania stacji bazowej, obejmujący: działanie w aktywnym trybie pracy podczas pierwszego okresu czasu, przy czym wspomniany aktywny tryb pracy obejmuje nadawanie sygnałów synchronizacji przy pierwszej szybkości;i operating in an active mode of operation during a first period of time, said active mode of operation comprising transmitting synchronization signals at a first rate;and - operation in transmit standby mode during a second period of time during which at least some of said synchronization signals are transmitted at at least one position: i) a lower speed than in said active mode, and ii) at a lower power level than said signals synchronization broadcast in said active mode. -78działanie w trybie pracy w gotowości do nadawania podczas drugiego okresu czasu, podczas którego co najmniej niektóre wspomniane sygnały synchronizacji są nadawane przy co najmniej jednej pozycji: i) niższej szybkości niż we wspomnianym aktywnym trybie, oraz ii) przy niższym poziomie mocy niż wspomniane sygnały synchronizacji nadawane we wspomnianym aktywnym trybie. 2. The method of claim 1, wherein the average transmit power level of said synchronization signals during said first period of time is higher than the average transmit power level of said at least some periodic signals during the second period of time. 2. Sposób według zastrzeżenia 1, w którym średni poziom mocy nadawania wspomnianych sygnałów synchronizacji podczas wspomnianego pierwszego okresu czasu jest wyższy niż średni poziom mocy nadawania wspomnianych co najmniej niektórych sygnałów okresowych podczas drugiego okresu czasu. 3. The method of claim 2, wherein during said first period of time, a first average amount of power is used to transmit said synchronization signals, said synchronization signals being a set of non-talking channel signals and said non-talking channel signals set comprising one of control and synchronization signals;and wherein during said second period of time the base station transmitter transmits said synchronization signals using an average transmit power level that is lower than said first average transmit power level. 3. Sposób według zastrzeżenia 2, w którym podczas wspomnianego pierwszego okresu czasu, pierwsza średnia ilość mocy jest wykorzystywana do nadawania wspomnianych sygnałów synchronizacji, przy czym wspomniane sygnały synchronizacji są zestawem sygnałów kanału nierozmównego, a wspomniany zestaw sygnałów kanału nierozmównego obejmuje jeden z sygnałów sterowania i synchronizacji;oraz w którym podczas wspomnianego drugiego okresu czasu nadajnik stacji bazowej nadaje wspomniane sygnały synchronizacji wykorzystując średni poziom mocy nadawania, który jest niższy niż wspomniany pierwszy średni poziom mocy nadawania. 4. The method of claim 3, wherein the transmission during said second period of time comprises: 4. Sposób według zastrzeżenia 3, w którym nadawanie podczas wspomnianego drugiego okresu czasu obejmuje: nadawanie co najmniej jednego ze wspomnianych sygnałów synchronizacji przy zmniejszonym poziomie transmitting at least one of said synchronization signals at a reduced level - powers relative to the power level at which said synchronization signals are transmitted during said first period of time. -79mocy w stosunku do poziomu mocy, przy którym wspomniane sygnały synchronizacji są nadawane podczas wspomnianego pierwszego okresu czasu. 5. The method of claim 1, wherein said synchronization signals are pilot signals. 5. Sposób według zastrzeżenia 1, w którym wspomniane sygnały synchronizacji są sygnałami pilota. 6. The method of claim 3, wherein transmitting during said second period of time comprises transmitting at least some of said synchronization signals at a reduced rate. 6. Sposób według zastrzeżenia 3, w którym nadawanie podczas wspomnianego drugiego okres czasu obejmuje nadawanie co najmniej niektórych ze wspomnianych sygnałów synchronizacji przy zmniejszonej szybkości. 7. The method of claim 6, wherein said at least some synchronization signals include at least one of beacon signals and pilot signals. 7. Sposób według zastrzeżenia 6, w którym wspomniane co najmniej niektóre sygnały synchronizacji obejmują co najmniej jeden z sygnałów nawigacyjnych i sygnałów pilota. 8. The method of claim 6, wherein said first time period is a single OFDM symbol transmission time period, in which at least some of the synchronization signals that are pilot signals are transmitted in parallel, and wherein the transmission of at least some of said synchronization signals at reduced speed includes transmitting at a lower rate the number of pilot signals during the symbol transmission time than said first number of synchronization signals. 8. Sposób według zastrzeżenia 6, w którym wspomniany pierwszy okres czasu jest pojedynczym okresem czasu nadawania symbolu OFDM, w którym co najmniej niektóre sygnały synchronizacji, które są sygnałami pilota są nadawane równolegle, i w którym nadawanie co najmniej niektórych wspomnianych sygnałów synchronizacji przy zmniejszonej szybkości obejmuje nadawanie mniejszej liczby sygnałów pilota w okresie czasu nadawania symbolu, niż wspomniana pierwsza liczba sygnałów synchronizacji. 9. The method of claim 8, wherein said first and second time periods correspond to the same periods of symbol transmission in a repeating downlink time setting structure. 9. Sposób według zastrzeżenia 8, w którym wspomniane pierwsze i drugie okresy czasu odpowiadają tym samym okresom czasu nadawania symboli w powtarzającej się strukturze ustawień czasowych łącza nadawczego (downlink). 10. Sposób według zastrzeżenia 2, w którym pierwszy okres czasu jest okresem czasu, w którym dane użytkownika są Of 10. The method of claim 2, wherein the first period of time is the period of time in which the user data is - transmitted via a talk channel between said base station and said wireless terminal;and wherein said second period of time is a period of time during which no user data is transferred between said base station and said wireless terminal. -80przesyłane poprzez kanał rozmówny między wspomnianą stacją bazową a wspomnianym terminalem bezprzewodowym;oraz w którym wspomniany drugi okres czasu jest okresem czasu, podczas którego żadne dane użytkownika nie są przesyłane między wspomnianą stacją bazową a wspomnianym terminalem bezprzewodowym. 11. The method of claim 8, wherein during said second period of time, the base station does not support any wireless terminals via a wireless communication link or all wireless terminals supported by said base station via a wireless communication channel are in a sleep state. 11. Sposób według zastrzeżenia 8, w którym podczas wspomnianego drugiego okresu czasu, stacja bazowa nie obsługuje żadnych terminali bezprzewodowych poprzez bezprzewodowe łącze komunikacyjne lub wszystkie terminale bezprzewodowe obsługiwane przez wspomnianą stację bazową poprzez kanał komunikacji bezprzewodowej są w stanie uśpienia. 12. The method of claim 1, further comprising: 12. Sposób według zastrzeżenia 1, dodatkowo obejmujący: base station operating to receive the signal;and to switch from said operating mode in readiness to transmit to said active operating mode in response to said received signal. działanie stacji bazowej w celu odbioru sygnału;oraz w celu przejś cia ze wspomnianego trybu pracy w gotowości do nadawania we wspomniany aktywny tryb pracy w odpowiedzi na wspomniany odebrany sygnał. 13. The method of claim 12, wherein said received signal is one of the signals - an access signal, a base station wake-up signal, a call switch signal, and a status change signal. 13. Sposób według zastrzeżenia 12, w którym wspomniany odebrany sygnał jest jednym z sygnałów - sygnałem dostępu, sygnałem wzbudzenia stacji bazowej, sygnałem przełączenia połączenia i sygnałem zmiany stanu. 14. The method of claim 13, wherein said signal is from a wireless terminal. 14. Sposób według zastrzeżenia 13, w którym wspomniany sygnał pochodzi z terminala bezprzewodowego. -8115. Sposób według zastrzeżenia 13, w którym wspomniany etap odbierania sygnału obejmuje odbieranie wspomnianego sygnału poprzez bezprzewodowe łącze komunikacyjne. -8115. The method of claim 13, wherein said step of receiving a signal comprises receiving said signal via a wireless communication link. 16. The method of claim 13, wherein said step of receiving a signal comprises receiving said signal from a network node coupled to said base station. 16. Sposób według zastrzeżenia 13, w którym wspomniany etap odbierania sygnału obejmuje odbieranie wspomnianego sygnału z węzła sieci sprzężonego ze wspomnianą stacją bazową. 17. The method of claim 1, further comprising: operating the base station to transition from said transmit standby mode of operation to said active mode of operation based on the provided schedule. 17. Sposób według zastrzeżenia 1, dodatkowo obejmujący: działanie stacji bazowej w celu przejścia od wspomnianego trybu pracy w gotowości do nadawania we wspomniany aktywny tryb pracy na podstawie przewidzianego rozkładu. 18. The method of claim 1, further comprising: 18. Sposób według zastrzeżenia 1, dodatkowo obejmujący: działanie stacji bazowej w celu przejścia od wspomnianego trybu pracy w gotowości do nadawania we wspomniany aktywny tryb w odpowiedzi na sygnał odebrany z kolejnego węzła. operating the base station to transition from said mode of readiness to transmit to said active mode in response to a signal received from the next node. 19. The method of claim 1, further comprising: 19. Sposób według zastrzeżenia 1, dodatkowo obejmujący: działanie stacji bazowej w celu przejścia od wspomnianego aktywnego trybu pracy do wspomnianego trybu pracy w gotowości do nadawania w odpowiedzi na wykrycie okresu nieaktywności kanału nadawania. operating the base station to transition from said active mode of operation to said mode of readiness to transmit in response to detecting the period of inactivity of the transmission channel. 20. Sposób według zastrzeżenia 1, dodatkowo obejmujący: twenty. The method of claim 1, further comprising: przechodzenie ze wspomnianego aktywnego trybu pracy do wspomnianego trybu pracy w gotowości do switching from said active operating mode to said operating mode ready for -82nadawania w odpowiedzi na wykrycie przejścia co najmniej jednego terminala bezprzewodowego z aktywnego stanu w uśpiony stan pracy. Sending in response to detecting the transition of at least one wireless terminal from an active state to a sleep state. 21. The method of claim 20, wherein the detected transition of at least one wireless terminal from an active state to a sleep state means that no wireless terminals currently supported by the base station are in an active state of operation. 21. Sposób według zastrzeżenia 20, w którym wykryte przejście co najmniej jednego terminala bezprzewodowego z aktywnego stanu w uśpiony stan pracy oznacza, że żadne terminale bezprzewodowe aktualnie obsługiwane przez stację bazową nie są w aktywnym stanie pracy. 22. The method of claim 1, further comprising: 22. Sposób według zastrzeżenia 1, dodatkowo obejmujący: przechodzenie ze wspomnianego aktywnego trybu pracy, do wspomnianego trybu pracy w gotowości do nadawania zgodnie z rozkładem. transitioning from said active operating mode to said operating mode in readiness for broadcasting in accordance with the schedule. 23. Base station containing: 23. Stacja bazowa, zawierająca: nadajnik do nadawania sygnałów;transmitter for transmitting signals;a first control module for controlling the transmission of synchronization signals during the first active operating mode, said first control module controlling the transmission of at least some synchronization signals at the first speed and the first power level during said first active operating mode;and a second control module for controlling the transmission of synchronization signals during the second synchronization signal mode, said second control module controlling the transmission of said at least some synchronization signals at a second and second speeds pierwszy moduł sterowania do sterowania nadawaniem sygnałów synchronizacji podczas pierwszego aktywnego trybu pracy, przy czym wspomniany pierwszy moduł sterowania, steruje nadawaniem co najmniej niektórych sygnałów synchronizacji przy pierwszej szybkości i pierwszym poziomie mocy podczas wspomnianego pierwszego aktywnego trybu pracy;oraz drugi moduł sterowania do sterowania nadawaniem sygnałów synchronizacji podczas drugiego trybu pracy sygnału synchronizacji, przy czym wspomniany drugi moduł sterowania, steruje nadawaniem wspomnianych co najmniej niektórych sygnałów synchronizacji przy drugiej szybkości i drugim -83poziomie mocy, w którym co najmniej jedna pozycja ze wspomnianej drugiej szybkości i wspomnianego drugiego poziomu mocy nadawania są zmniejszane w stosunku odpowiednio do pierwszej szybkości i pierwszego poziomu mocy. A power level at which at least one position from said second speed and said second transmit power level are reduced relative to the first speed and first power level, respectively. 24. The base station of claim 23, further comprising: 24. Stacja bazowa według zastrzeżenia 23, dodatkowo zawierająca: base station transition control module for controlling the transition between said first and second operating modes synchronization signal. moduł sterowania przejściem trybu stacji bazowej do sterowania przejściem między wspomnianym pierwszym i drugim trybem pracy sygnał u synchronizacji. 25. The base station of claim 24, further comprising: 25. Stacja bazowa według zastrzeżenia 24, dodatkowo zawierająca: memory for storing distribution information used by said control module of base station mode transition when determining when the transition between synchronization signaling modes occurs. pamięć do przechowywania informacji o rozkładzie wykorzystywanej przez wspomniany moduł sterowania przejściem trybu stacji bazowej przy określaniu, kiedy następuje przejście między trybami pracy sygnalizacji synchronizacji. 26. The base station of claim 25, wherein said schedule information includes date, time and corresponding mode information for a wide variety of times. 26. Stacja bazowa według zastrzeżenia 25, w której wspomniana informacja o rozkładzie obejmuje datę, czas i odpowiednie informacje dotyczące trybu, dla wielu różnych czasów. 27. A base station according to claim 24, comprising: 27. Stacja bazowa według zastrzeżenia 24, zawierająca: a receiver for receiving signals from a wireless, and in which said control module additionally terminal switching base station mode responds to at least one of odbiornik do odbioru sygnałów z bezprzewodowego, oraz w której wspomniany moduł sterowania dodatkowo terminala przejściem trybu stacji bazowej reaguje na co najmniej jeden z -84 signals - excitation signal, access request signal and mobile node state transition request signal received using said receiver. -84sygnałów - sygnał wzbudzenia, sygnał żądania dostępu i sygnał żądania przejścia stanu węzła mobilnego odebrany za pomocą wspomnianego odbiornika. 28. The base station of claim 27, further comprising: 28. Stacja bazowa według zastrzeżenia 27, dodatkowo zawierająca: an interface coupling said base station to a network node;and wherein said base station mode transition control module responds to at least one of the signals - a call switching signal, an excitation signal, a state change control signal, and a state change request signal transmitted via said interface. interfejs sprzęgający wspomnianą stację bazową z węz ł em sieci;oraz w której wspomniany moduł sterowania przejściem trybu stacji bazowej reaguje na co najmniej jeden z sygnałów - sygnał przełączenia połączenia, sygnał wzbudzenia, sygnał sterujący zmianą stanu i sygnał żądania zmiany stanu przesyłany za pomocą wspomnianego interfejsu. 29. The base station of claim 28 wherein said base station mode transition control module changes from said first active mode of operation to said second mode of synchronization signal in response to not detecting any users with an active uplink in which user data is transmitted in certain period of time. 29. Stacja bazowa według zastrzeżenia 28 w której wspomniany moduł sterowania przejściem trybu stacji bazowej przechodzi ze wspomnianego pierwszego aktywnego trybu pracy we wspomniany drugi tryb pracy sygnału synchronizacji w odpowiedzi na nie wykrycie żadnych użytkowników z aktywnym łączem zwrotnym (uplink), w którym dane użytkownika są przesyłane w pewnym okresie czasu. 30. Stacja bazowa według zastrzeżenia 29, w której wspomniany nadajnik stacji bazowej jest nadajnikiem sygnału thirty. A base station according to claim 29, wherein said base station transmitter is a signal transmitter OFDM. OFDM. Qualcomm Incorporated Full nomocnik: Qualcomm Incorporated Peł nomocnik: - 85 53 / 57P25407PL00 - 85 53/57P25407PL00 DO KOLEJNYCH WĘZŁÓW SIECI/ INTERNET TO NEXT NETWORK / INTERNET NODES FIGURA 1 FIGURE 1 -86 BASE STATION - ACCESS Node -86STACJA BAZOWA - WĘZEŁ DOSTĘPU DO KOLEJNYCH WĘZŁÓW SIECI/ INTERNET FIGURA 2 TO NEXT NETWORK NODES / INTERNET FIGURE 2 -87s -87s CO WHAT LLI < LLI < P ?§ w m P? § in m LU LU N ABOUT£ N O£ 2 ^ 0 <CL - ZO δ 2^0 < CL — Z O δ O LU < LL _l P Z < W O LU <LL _l PZ <W O yLO Oh yo C0 \ t £> C0\ t£> CO WHAT Sm sm UJ p UJ s o w >o o Q- O o S o g ow> oo Q- O o S og co —4— <D every —4— <D After Po O H W LU > 2j f llt O Ś OHW LU> 2j f llt ABOUT Ξ) N > ω s ? CL O < < N — I- N ωο< Ξ) N> ω s? CL O <<N - I- N ωο < kABOUT kO LLlJ < lllJ < CL CL Oj cm cm ω «<co Oj cm cm ω«< co -W j - i> LU i < FROM 'n ω and OQ ο · ω;lu -5 every ltj -W j — i > LU i < Z ’ n ω i O Q ο·ω ;lu -5 co ltj Pl Pl A AND CM § s 5 < CM § s 5 < LU Q ΰ DC H O ó LU Q ΰ DC HO Fm 00 o fm 00 about m co m every co co* what what* 0- LU Z N < < z id £2 0- LU ZN <<from id £ 2 CO m WHAT co ro cc co ro cc CD ro co CD ro co CD co co CD every what FIGURA 3 FIGURE 3 INDICATOR WSKAŹNIK TONE TONU -89WSKAŹNIK -89WSKAŹNIK TONE TONU U) and U) i o o oo INDICATOR WSKAŹNIK TONE TONU INDICATOR WSKAŹNIK TONE ο TONU ο CO WHAT FIGURA 10 θ FIGURE 10 θ ο ο 4 11 4 11 FIGURA 11 FIGURE 11 FIGURA 12 FIGURE 12 -951300 -951300 FIGURA 13A FIGURE 13A FIGURA 13A FIGURE 13A FIGURA 13B FIGURE 13B FIGURA 13C FIGURE 13C FIGURA 13 FIGURE 13 FIGURA 13B FIGURE 13B 1346 1346 call was received? ^ połączenia został Odebrany?^ Monitor BS mode change signal Monitoruj sygnał zmiany trybu BS NIE NO 1369 YES 1369 TAK Czy Whether NIE NO TAK YES FIGURA 13C FIGURE 13C -98f -98f CD CD ANSWER TO THE DETERMINED PERIOD OF INACTIVITY ODPOWIEDŹ NA WYKRYTY OKRES NIEAKTYWNOŚCI -99WSKAŹNIK -99WSKAŹNIK TONE TONU CM CM ABOUT O ŁO ŁO -100- -100- FIGURA 16 FIGURE 16 101TONY 101TONY FIGURA 17 FIGURE 17 -102- -102- FIGURA 18 FIGURE 18 -103- -103- FIGURA 19 FIGURE 19
239 paragraphs, as filed
[0001] The present invention relates to methods and apparatus for implementing wireless communication systems, wherein the apparatus may include, for example, base stations that support multiple modes of operation and / or wireless terminals for interaction with base stations that support multiple modes of operation.
BACKGROUND OF THE INVENTION [0002] Typically, in a wireless communication system, base stations are powered and operated continuously in an active mode of operation. In this active operating mode, the base station is operated in accordance with the downlink time and frequency structure settings, e.g., repetitive time settings and frequency structure. Synchronization signals such as beacon signals and pilot signals are transmitted based on a predetermined distribution in connection with a predetermined power level. The power levels and transmission speed of these synchronization signals usually do not differ regardless of the number and / or status of the users who are currently served by the base station. With high population density of cellular network coverage areas, this is not important, since there are usually at least one or more active users at any given time using the base station as their point of connection and user data transfer. These active wireless terminals require a full level of synchronization signals such as precise maintenance
-3 synchronization of time settings and keeping accurate current channel estimates.
[0003] However, in some areas of the cellular network coverage, such as remote rural areas, low population density and / or areas with widely varying load requirements expressed as a function of time or distribution, it would be beneficial if methods and the device were developed so that they allow the base station to be operated at a certain time and / or under certain conditions, such as reducing transmit power and / or reducing interference generated by the base station. For example, we consider the case that a base station, e.g. a base station along a train track in a rural area, may have significant time intervals, and the base station has no registered wireless terminals that need to send user data, e.g., receive and / or send user data. In this situation, during this time interval, base station power is wasted by transmitting a full set of synchronization signals at normal power levels. In addition, adjacent cells, which may have high population densities and usually have many active users, will be adversely affected by interference generated from unnecessary synchronization transmission signaling. By reducing the level of interference experienced in an adjacent cell, the data throughput in that adjacent cell can be increased, for example, by allowing the coding rate to be increased for a given transmit power level and modulation system.
[0004] It would be desirable for the methods and apparatus to be developed to reduce transmission synchronization signals in response to changing
-4 (hand-off levels and possibilities of signaling system conditions. It would be beneficial if such methods and the device support at least some: fast transition back to full level of synchronization signals when required, easily detectable reactivation signals, uniform operations suspend the transition between different synchronizations as a function of schedule information. It would also be beneficial if the developed methods and device for supporting multiple levels of synchronization signaling were still able to support registered wireless terminals in the sleep state of wireless terminals regardless of the level of synchronization signaling. In addition, it would be beneficial if the low level of synchronization signaling still provided the wireless terminal with the capability to detect the presence of the base station and / or compare the received base station signal with other neighboring base stations that could potentially be used as attachment points to network.
[0005] In view of the above, there is a need for new methods and apparatus for implementing and operating a base station operating in multiple modes.
SUMMARY OF THE INVENTION [0006] The present invention relates to methods and apparatus for implementing wireless communication systems, wherein the apparatus may include, for example, base stations that support multiple modes of operation and / or wireless terminals for interaction with base stations that support multiple modes of operation.
[0007] In various embodiments of the invention, the base station supports multiple modes of operation, for example, the first
-5 mode such as full power mode and second mode such as sleep mode. More than two operating modes can be and in some embodiments are supported by a base station, each mode of which corresponds to, for example, different signaling rates of at least one periodic signal and / or different power levels used to transmit certain specific periodic signals such as a group pilot tone or beacon signals.
[0008] By supporting multiple modes of operation, the transmission of base station control signals can be reduced when a higher level of signaling is not required, for example when there are no active wireless terminals in the cell. By reducing the base station broadcast in terms of frequency and / or power level, interference in communication in adjacent cells can be reduced. This allows for improved throughput in systems with multiple base stations, where broadcasting by neighboring base stations can lead to mutual interference. Depending on the specific operating mode, the base station may support downlink signaling, e.g., data broadcast, but not uplink data, which may require a higher level of control signaling. Modes that support both downlink and reverse link user data communication, e.g., text data, image data, audio data and / or user user data, between wireless terminals and the base station normally correspond to one or more higher, e.g., with full turns on, base station operation modes.
[0009] During different base station operating modes, different levels and / or signaling rates and / or output power
- 6 broadcasts are supported depending on the operation mode. For example, in some embodiments, pilot signals and / or various control signals that are normally transmitted at the first periodic speed in a fully on state are transmitted at a reduced speed during the sleep mode of the base station compared to the full activation of the base station mode . In some embodiments, the number of pilot signals transmitted during sleep mode is reduced during individual periods of symbol transmission time during the sleep mode of operation compared to the full activation of the mode of operation. In some embodiments, the number of individual periods of symbol transmission time during which pilot signals are transmitted during a sleep mode of operation is reduced from the number of individual periods of symbol transmission time during which pilot signals are transmitted in full activation of the mode of operation, for the same number of periods of time. broadcasting OFDM symbols, for example, the same number of consecutive periods of broadcasting OFDM symbols corresponding to a grouping in the structure of repeating forward link time settings. In some embodiments, during a partially turned on or dormant mode of operation, the power level at which specific signals are transmitted is reduced compared to the power level used when the mode is fully turned on.
[0010] The base station transition between operating modes can be triggered in many ways. The base station may operate in various modes, according to a predetermined timetable, for example, train timetable, commuter timetable or other type of timetable. Such a distribution can be designed so that the base station will operate in the fully on state in the specified
They support detected points at a known time for normally corresponding periods of wireless terminal data transmission activity. Alternatively or in addition to the designated base station operating modes, in some embodiments, the base stations monitor the activity of the wireless terminals in the cell that they adapt to the level of data transmission activity. For example, the base station may switch from full power on to a lower activity mode with less control signaling in response to detecting a period in which no user data, e.g. text, voice or other user user data has been transmitted by a predetermined period of time or when there is an indication that this cell does not contain any active or registered wireless terminals.
[0011] Transitions are triggered, in some embodiments, from the base station's dormant operating mode to fully engaging the operating mode by receiving an excitation signal from a mobile node. Wireless terminal registration and / or mobile node request signals to transition from the mobile device's dormant mode of operation to the active mode of the mobile node, in which the mobile node can transmit user data on the reverse link can serve as excitation signals and / or control signals that are used to cause base station operation changes from less active to more active base station operating mode.
[0012] The methods and apparatus of the present invention operate with different modes of activity. While power transmission is one advantage of supporting multiple base station modes, the reduced signal interference achieved by operating base stations saves
- 8 modes of reduced base station operation activity may increase the overall system performance by reducing interference in adjacent cells during sleep mode or other mode of reduced base station operation activity.
[0013] Numerous additional features of advantages and embodiments of the present invention are discussed in detail herein below.
BRIEF DESCRIPTION OF THE FIGURES [0014] Figure 1 is a drawing of an exemplary communication system implemented in accordance with the present invention and using methods of the present invention.
[0015] Figure 2 is a drawing of an exemplary base station implemented in accordance with the present invention and using methods of the present invention.
[0016] Figure 3 is a drawing of an exemplary wireless terminal implemented in accordance with the present invention and using methods of the present invention.
[0017] Figure 4 is a drawing of an exemplary time frequency grid reflecting radio link resources for a forward link available to a base station implemented in accordance with the present invention, and an indication of time setting synchronization signals transmitted by a base station using these resources when operating in an active mode.
[0018] Figure 5 is a drawing of an exemplary time frequency grid reflecting radio link resources for the forward link available to a base station implemented in accordance with the present invention, and an indication of the synchronization signals of the time settings transmitted by
- a base station utilizing these resources when operating in transmit standby mode for the embodiment. [0019] Figure 6 is a drawing of an exemplary time frequency grid reflecting radio link resources for a forward link available to a base station implemented in accordance with the present invention, and an indication of the synchronization signals of the time settings transmitted by the base station using these resources during operation in the standby mode for another embodiment.
[0020] Figure 7 is a drawing of an exemplary time frequency grid reflecting radio link resources for a forward link available to a base station implemented in accordance with the present invention, and an indication of synchronization signals of time settings transmitted by the base station using these resources during operation in the standby mode for yet another embodiment.
[0021] Figure 8 is a drawing illustrating an exemplary base station implemented in accordance with the present invention, currently in an active base station operating mode, in which the base station cell includes an active wireless terminal.
[0022] Figure 9 is a drawing illustrating an exemplary base station implemented in accordance with the present invention, currently operating in transmit standby mode, in which the base station cell includes wireless terminals that are turned off but does not contain any wireless sleep terminals or active state.
[0023] Figure 10 is a drawing illustrating an exemplary base station implemented in accordance with the present invention, currently operating in a mode
-10 working in broadcast standby, in which the base station cell includes a wireless terminal that is turned off and a wireless terminal that is in sleep mode but does not contain any wireless terminals in the active state.
[0024] Figure 11 is a drawing of a table illustrating the characteristics of an active station operating mode and a base station operating mode in readiness for the present drawing illustrating comprising a base broadcast train on an embodiment of the present invention.
[0025] Figure 12 shows an exemplary communication system routed through wireless cells and distribution information used when switching the base station operating mode, a communication system implemented in accordance with the present invention and using methods of the present invention.
[0026] Figure 13 comprising the combination of Figure 13A, Figure 13B, and Figure 13C is a flowchart of an exemplary method of operating a base station in accordance with the present invention.
[0027] Figure 14 of an exemplary base station by the present invention.
[0028] Figure 15 is a drawing of an exemplary time frequency grid reflecting radio link resources for a forward link available to a base station implemented in accordance with the present invention, and an indication of synchronization signals of time settings transmitted by the base station using these resources during operation in the standby mode for yet another embodiment.
shows a drawing of the state diagram implemented in accordance with
[0029] Figure 16 is a drawing illustrating a series of operations for successive moments of time in an embodiment of the present invention, these operations include base station wake-up signaling transmitted over a wireless link.
[0030] Figure 17 is a drawing illustrating part of the exemplary OFDM uplink time settings and frequency structure for explaining the exemplary base station wake-up signaling in accordance with various embodiments of the present invention.
[0031] Figure 18 is a drawing illustrating exemplary uplink radio link access resources, exemplary segments and exemplary signaling corresponding to an active base station operating mode and a base station operating mode in readiness for broadcasting, in accordance with some embodiments of the present invention.
[0032] Figure 19 is a flowchart of an exemplary method of operating a wireless terminal in accordance with the present invention.
DETAILED DESCRIPTION [0033] Figure 1 is a drawing of an exemplary communication system 100 implemented in accordance with the present invention and using methods of the present invention. An exemplary communication system 100 may be, for example, a multi-access wireless orthogonal frequency division multiplexing (OFDM) communication system. Exemplary system 100 includes a plurality of base stations (BS 1 106, BS M 108), each BS base station (106, 108) having a corresponding cellular coverage area (cell 1 102, cell M 104). BS base stations (106, 108)
-12 example, router. 106, BS M 108), are implemented in accordance with the present invention, and support (i) an active mode of operation and (ii) a mode of readiness to transmit. BS base stations are coupled together via a backhaul network. System 100 also includes network node 110, on Network Node 110 it is coupled to (BS 1 via network links (120, 122), respectively. Network link 124 couples network node 110 to other network nodes, e.g., other base stations
BS, routers, authentication nodes - command control authorization (AAA) - (Authentication - Authorization Accounting), home agent nodes, etc., and / or with
Internet. The network links (120, 122, 124) may be, for example, fiber optic links, cable links and / or high performance radio links, such as targeted microwave links.
[0034] System 100 also includes a plurality of wireless terminals (WT 1112 WT N114 WT 1'116 WT N'118).
At least some of the WT wireless terminals (112,
114, 116, 118) are mobile nodes that can move through the communication system and establish a connection network point using the base station in the cell in which it is currently located. WT (112, 114, 116, 118) wireless terminals can be, for example, mobile phones, portable data terminals, personal digital assistants (PDAs), portable computers, and / or other wireless communication devices supporting communication voice, video, text, messages and / or files. Wireless terminals WT (112, 114, 116, 118) are implemented in accordance with the present invention to support wireless communication signaling by means of base stations (106, 108) operating in multiple modes.
[0035] WT wireless terminals (112, 114) are currently located in cell 1 102 and can be coupled to BS 1 106 base station via wireless links (126, 128) respectively. The WT wireless terminals (116, 118) are currently located in cell M 104 and can be coupled to BS M 108 base stations via wireless links (130, 132) respectively. WT wireless terminals (112, 114, 116, 118) can operate in various states, for example, in an active state or in a sleep state. In some embodiments, the active state of the WT wireless terminal may then be an authorized WT wireless terminal supporting an active on state and an active suspended state.
[0036] Figure 2 is a drawing of an exemplary base station 200 implemented in accordance with the present invention and using methods of the present invention.
An example of a BS 200 elder station may be any of the BS (106, 108) base stations of the system 100 of Figure 1. An example of a BS 200 base station includes receiver 202, transmitter 204, processor 206, input / output interface 208, and memory 210 coupled together via bus 212, through which various elements can exchange data and information. Receiver 202 is coupled to a receiving antenna 203 through which the base station 200 can receive uplink signals from a plurality of wireless terminals. The received reverse link signals may include, for example, access signals, base station wake-up signals, handoff signals, WT wireless terminal change signals, resource requests, user data, power control information signals, time control information signals, confirmation signals. Receiver 202 includes a decoder 214 for decoding the received uplink signals that have been
Previously encoded by the WT wireless terminal prior to transmission, e.g., by decoding the encoded user data block transmitted in the uplink talk channel segment. Transmitter 204 is coupled to transmit antenna 205 by means of which the BS base station can transmit downlink signals to WT wireless terminals. Downlink signals may include, for example, beacon signals, pilot signals, power control signals, time setting control signals, registration signals, paging signals, assignment signals and user data signals. Transmitter 204 includes an encoder 216 for encoding downlink data / information, e.g., encoding a user data block into a downlink talk channel segment. In different base station modes, different sets of downlink signals may be transmitted, different power levels may be used for the same type of downlink signal, and / or the frequency of transmitting different signals may be different. The I / O interface 208 provides the BS 200 base station with an interface to the interconnection network by coupling the BS 200 base station with other network nodes and / or the Internet. Signals transmitted via the I / O interface 208 may include, for example, scheduling information associated with switching BS 200 base station modes, BS base station wake-up signals, BS base station command mode change signals and WT wireless terminal connection switching signals.
[0037] Memory 210 includes procedures 218 and data / information 220. The processor 206, for example, the CPU executes procedures 218 and uses data / information 220 in memory 210 to control the operation of the base station 200 and implement the methods of the present invention. Procedures 218 include communication procedures 222 and base station control procedures 224.
-15 Communication procedures 222 implement various communication protocols used by the BS 200 base station. Base station control procedures 224 include scheduling module 226, base station mode transition module 228, active mode module 230, transmission ready mode module 232, receiver control module 234, transmitter control module 236 and input / output interface control module 238.
[0038] Scheduling module 226, e.g., the scheduler, schedules uplink and forward link segments for WT wireless terminals. Scheduling is a function of the BS 200 base station operating mode. In some embodiments, when the BS base station is in active mode of operation, the BS base station may schedule uplink and uplink talk channel segments for WT wireless terminals while the BS base station is in standby mode, BS base station it does not schedule any reverse link or forward link talk channel segments for WT wireless terminals.
[0039] The base station mode transition control module 228 controls the transition of the BS 200 base station between an active mode of operation and a transmission readiness mode. Base station mode transition module 228 uses data / information 220 in memory 220 containing mode transition criteria 270, mode transition information 269, number of active users 253, inactivity time 254, received 255 access signals, received 256 excitation signals, received 257 signals connection switching, status change signals received 258, change mode signals received 249 and / or current mode 252 when deciding, whether and at what time to switch between base station operating modes, for example, from active
-16 mode in broadcast standby mode or from broadcast standby mode in active mode. As part of the mode transition process, the mode transition module 228 activates one of the active mode modules 230 and the mode module 232 in transmit standby when deactivating the other.
[0040] The active mode control module 230 controls the base station BS operations in the base station active mode. The active mode module 230 includes a first synchronization signaling module 240, a talk channel signaling module 242 and a first paging module 244. The first synchronization signaling module 240 uses data / information 220 containing information 272 about the synchronization signal of the active mode to control the power level and speed of the synchronization signals, the synchronization signals comprising beacon signals and pilot signals. In the active mode of operation, at least some of the synchronization signals are controlled to be transmitted at at least one position: (i) higher power level and (ii) higher speed when the base station is in the standby mode. In active mode, base station 200 supports uplink and uplink talk channel signaling with scheduler 226 scheduling uplink and uplink talk channel segments to active WT wireless terminals that are served by BS 200 base station, e.g., WT wireless terminals currently registered at the BS 200 base station, operating in active mode of operation and currently having a BS base station assigned to the active user ID of the WT wireless terminal. Reverse talk cell reverse link segments are used to convey user data / information. Module 242
- traffic channel signaling controls operations related to coding, modulation and broadcasting of downlink talk channel signals and controls operations related to decoding, demodulation and recovery of reverse link traffic channel signals. The first paging module 244 controls paging operations in the active mode of the base station.
[0041] The transmit standby control module 232 controls the operations of the base station BS in the base standby mode of transmission. The transmit standby control module 232 includes a second synchronization signaling module 246 and a second paging module 244. Second synchronization signaling module 246 uses data / information 220 containing information 279 about the synchronization signal in ready to transmit mode to control the power level and speed of the synchronization signals, the synchronization signals comprising at least one of the beacon signals and the pilot signals. In the transmission standby mode, at least some of the synchronization signals are controlled so that they are transmitted at at least one position: (i) lower power level and (ii) lower speed when the base station is in active operating mode [ 0042] The receiver control module 234 controls the operations of the receiver 202; the transmitter control module controls the operations of the transmitter 204; the input / output interface control module controls input / output interface 208 operations. In some embodiments, modules 234, 236, and / or 238 work in conjunction with either the active mode module 230 or the transmit standby module 232 depending on the current BS base station operation mode 252. [0043] Data / information 220 includes WT wireless data information 250, Data / information 251 o
-18 system, current mode 252, number of active users 253, time of 254 inactivity and current information 259 about transmission power. Sometimes one or more of the following information may be included in information 220: received information about access signal 255, received information about excitation signal 256, received information about suspension signal 257, received information about status change signal 258 and received information about signal 249 mode changes.
[0044] The WT wireless terminal data information 250 contains different sets of information at different times depending on the WT wireless terminals currently supported by the BS 200 base station. Sometimes the BS base station may not have any users in either sleep or active state. which are currently registered and supported. Other times, the BS base station may have one or more users who are served by the BS 200 base station and the WT wireless terminal data / information 250 contains (data / information about the WT 1 wireless terminal 260, ... 261 data / information about the terminal WT N), each data / information set corresponding to the WT wireless terminal of the currently supported user. The WT 1 wireless terminal data information 260 includes user data 262, the WT wireless terminal identification 264, device / session / resource information 263 and the WT wireless terminal user information 265. User data 262 includes, for example, voice, video, text, data file and information intended for the WT 1 wireless terminal and / or to be sent to the peer node of the WT 1 wireless terminal in a communication session with the WT 1 wireless terminal.
The identification information 264 of the WT wireless terminal includes identifiers associated with the WT 1 wireless terminal, e.g., a unique device identifier, a base station assigned to the registered user identifier and / or a base station assigned to the active user identifier. The device / session / resource information 263 includes information that identifies the type of WT device, e.g., mobile phone, data terminal, model, class, layer, etc., session information including, e.g., routing information, information identifying the peer, session time information, etc., and resource information containing, for example, an assigned reverse link and / or downlink talk channel segments, assigned dedicated control channel segments, assigned resources for paging directed to the WT1 wireless terminal, etc. Information about the user status of the WT wireless terminal 265 includes information identifying the current operating status of the WT 1 wireless terminal, for example, sleep state, active suspension on state or active state suspension.
[0045] The current mode 252 includes information identifying the current operating mode of the BS 200 base station, the active mode or mode in readiness for broadcasting users 253 identifies the wireless WTs currently registered with the base station BS 200 in the active operating state. Inactivity time 254 is the time counter maintained by the BS 200 base station with the amount of time since at least one WT wireless terminal was active from the point of view of the BS 200 base station. When the inactivity time 254 exceeds the threshold in the mode transition criteria 270, the mode transition module 228 causes the transition of the station
The number of active terminals number
-20 base BS from active mode to standby for broadcast.
[0046] Received access signal information 255 means a detected received request for access by a wireless WT, e.g., registered In some embodiments, under certain access signal 255, terminal 228, request terminal transition signal.
conditions, received by can be used to trigger a transition from the standby mode to transmit to the active mode. For example, it is possible that the WT wireless terminal has entered the BS 200 base station cell and requires user data transfer, the BS base station may be in the transmit standby mode, the WT wireless terminal may send a reverse link access signal during the contention-based access interval and the received one the signal may be used as a transition 228 to trigger the transition of the BS 200 base station into active mode.
[0047] The received information about the wake-up signal means a detected received request to transition the base station from the standby mode to transmit to the active mode. For example, the wireless terminal, by monitoring the power level and / or rate of synchronization signals transmitted on the forward link, determines that the base station BS 200 is in transmit standby mode, but decides that it requires becoming an active user; therefore the WT wireless terminal sends the wake-up signal to the BS base station. For example, in some embodiments, the tone, tones or predefined times within the time / frequency setting structure may be reserved to receive the excitation signal. In some embodiments, the same radio link resources reserved for access signals may also be
-21 used for excitation signals. In some embodiments, the excitation signal has different properties than the access signal. In some embodiments, the wake-up signal is the same as the access signal, with the BS 200 treating the received signal differently depending on its current mode 252.
[0048] The received call switching signal 257 includes information related to the connection switching operation. In some embodiments, sometimes, the handoff signal may be transmitted over a wireless link with a WT wireless terminal. In some embodiments, sometimes, the call switching signal may be transmitted via the interconnection network via the I / O interface 208, for example, taking into account more uniform and / or faster connection switching operations. The received information 257 about the call switching signal can be used by the BS 200 base station to update the data / information of the WT wireless terminal and the number of active users 253. For example, if the received information 257 of the call switching signal indicates that the last current active user is switched to an adjacent base station, this information may be used to update the number of active users 253 and trigger the inactivity timer 254. In another example, if the received information 257 of the call switching signal indicates that the last current registered user in the BS 200 base station, e.g., the sleep state user is switched to the neighbor base station, the 257 information of the switching switching signal can be used to call transition from active mode to
- ready to transmit mode without waiting for the inactivity delay timer to reach the transition criterion. As yet another example, if the received switching information 257 indicates that the active WT wireless terminal is to be switched from an adjacent BS base station to a BS 200 base station, where the BS 200 base station is currently in transmit standby mode, the information may be used to bring the base station 200 into active mode, for example, so that the BS 200 base station will be in active mode, when the WT wireless terminal performs call switching, providing more uniform connection switching operations.
[0049] The received mode change information 249 includes information received in a command mode change message, e.g., from a central management command node, indicating that the base station mode change will be made. For example, a central management node may indicate mode changes according to a schedule or according to total interference level, load patterns, priority issues, contingency issues, etc. In another example, a neighbor base station may send a command mode change message to the BS 200 base station.
[0050] The received state change signal information 258 includes received information from the WT wireless terminal indicating a request for a state change, e.g., from a sleep state to an active state or from an active state to a user state. This affects the BS base station's operating mode accordingly. For example, if the BS base station is currently in transmit standby mode and the BS base station receives a signal indicating that one of the WT wireless terminals is currently registered, but in sleep state, requests transition to the active state, module 228
23 transitions can cause the base station 200 to go into active mode. In another example, if the BS base station is currently in active mode, with only one active WT wireless terminal, and the active WT wireless terminal requests sleep, then the BS base station sets the number of active users 253 to zero and starts the inactivity counter, which may cause the base station to go into standby mode, if no other WT wireless terminal becomes active before reaching the timeout criterion.
[0051] Current transmit power information 259 is information related to the current broadcast of the BS base station. According to the invention, the average transmission power of the BS base station associated with the transmission of non-spoken channel signals during the standby mode of operation is reduced when compared with the average transmission power associated with the transmission of non-spoken channel signals during the active mode. For example, by reducing the power level of each pilot signal during transmit standby mode, the average transmit power is reduced. Alternately, by reducing the number of pilot tones per OFDM symbol transmission time interval, e.g., four to one, the average transmission power is reduced. Alternately, by skipping OFDM symbol transmission time intervals during which pilot signals are carried, the average transmission power is reduced.
[0052] System data / information 251 includes active mode information 266, transmission ready mode information 267, frequency structure information and uplink / forward link time information 268,
[0053] Information information 272 about characteristic information 269 about distribution, information 270 about mode transition criterion and information 271 about power.
266 Active mode contain synchronization signals containing information related to synchronization signals that are generated and transmitted by the BS base station when they are in active mode. The synchronization signal information 272 includes 273 beacon information and pilot information 274. The navigation information 273 includes power information 275, e.g., a reference power level associated with the beacon tone or tones of each beacon, and speed information 276, e.g., information identifying the speed of beacon transmission when in active mode. Pilot information 274 includes power information 277, e.g., reference power level associated with pilot tone tones, and speed information 278, e.g., information that identifies which of the OFDM transmission time intervals are used to transmit pilot tone. and how many pilot tones are transmitted simultaneously in each OFDM transmission time interval in which pilot tones are transmitted when they are in active mode. [0054] The transmit standby information 267 includes the information 279 containing the characteristic synchronization signals which by the base station BS when they are in the transmit standby mode. The synchronization signal information 279 includes information 280 about the beacon signal and pilot information about the 281 signal. The navigational information 280 includes power 282 information, e.g., a reference power level associated with a beacon tone or synchronization tone tones, related information is generated and transmitted
Each beacon and speed information 283, e.g., information identifying the speed of transmitting the beacon when in transmit standby mode. Pilot information 281 includes power information 284, e.g., reference power level associated with pilot tones, and rate information 285, e.g., information that identifies which OFDM transmission time intervals are used to transmit pilot tone and how many pilot tones are transmitted simultaneously in each OFDM transmission time interval in which the pilot tones are transmitted when they are in transmit standby mode. According to the present invention, at least some of the synchronization signals transmitted by the base station in transmit standby mode are transmitted at at least one position: (i) reduced power level and (ii) reduced speed relative to the active mode. This results in a lower average transmit power output by the base station when it is in transmit standby mode, which results in reduced interference levels from the point of view of neighboring cells that use the same frequencies.
[0055] Information 268 about the frequency structure and uplink / downlink time settings include, for example, uplink carrier frequency, uplink tone block, forward link carrier frequency, downlink tone block, uplink tone hopping information, information about skipping tone of the forward link, segment definitions at repetitive time settings and frequency structure, navigation information, pilot signal information, OFDM symbol transmission time setting information, and OFDM symbol grouping to, for example,
-26 half-slots, slots, super-slots, navigation slot, ultra-slots etc. The schedule information 269 includes saved schedule information identifying the moment of transition to the base station between the active mode and the standby mode. In various embodiments, the distribution information 269 includes data, time, and corresponding mode information for many different moments. The distribution information 269 may include predetermined timetables and / or timetables that can be corrected. For example, the BS 200 base station may be located in a remote region with low population density, and the timetable information 269 may be based on train timetables or coordinated timetables to ensure that the base station is in an active mode consistent with the expected train presence in the base station cell. Regulation information may be sent to take account of train delays, cancellations and / or adding trains from outside the timetable.
[0056] Mode transition criterion information 270 includes information such as inactivity time limits used by base station mode transition module 228 to determine if and when mode switching should be performed. The power information 271 includes information about the power of the BS base station, for example, the rated power level of the BS base station reference start and specific power levels or offsets from the start level associated with each of the different types of signals to be transmitted by the BS base station, e.g. , beacon, pilot tone, flash memory allocation, permanent allocation, recall, talk channel at different data rates, etc.
[0057] Figure 3 is a drawing of an exemplary wireless terminal (WT) 300 implemented in accordance with
By the present invention and using the methods of the present invention. The exemplary WT 300 wireless terminal may be any of the WT wireless terminals (112, 114, 116, 118) of the exemplary system 100 of Figure 1. [0058] The exemplary WT 300 wireless terminal includes receiver 302, transmitter 304, processor 306, input devices 308 / User outputs and memory 310 coupled together via a 312 bus through which various elements can exchange data and information. Receiver 302 is coupled to a receiving antenna 303, through which the WT 300 wireless terminal can receive downlink signals from BS 200 base stations.
[0059] When the base station 200 is in transmit standby mode, the forward link signals include synchronization signals, e.g., beacon signals and pilot signals at reduced speed and / or power level. When the base station 200 is in active mode of operation, the downlink signals include synchronization signals, e.g., beacon signals and pilot signals at a higher speed and / or higher power level compared to the standby mode. In the active mode of the BS base station, uplink and forward link talk channel signaling is supported and downlink signals usually also include assignment signals and talk channel signals. Receiver 302 includes a decoder 314 that decodes received downlink signals that have been encoded by the base station prior to transmission.
[0060] Transmitter 304 is coupled to transmit antenna 305 through which the WT 300 wireless terminal can transmit uplink signals to BS 200 base stations. In some embodiments, the same antenna is used for both the receiver and the transmitter.
Uplink signals may include access signals, BS base station wake-up signals, WT wireless terminal change request signals, uplink talk channel segment resource requests, connection switching signals, power and time control signals, and user data signals. Transmitter 304 includes an encoder 316 that encodes at least some uplink signals prior to transmission.
[0061]
User input / output devices 308 include, for example, switches, a microphone, a speaker, a display, an auxiliary keyboard, a keyboard, a touch screen, a mouse, a camera, etc., and provide an interface for entering user data / information and outputting received user data / information . User input / output devices 308 also allow the WT 300 wireless terminal operator to control at least some WT wireless terminal operations, e.g., initiating connection, initiating mode change request, accessing stored information, power off, power off, etc.
[0062] Memory 310 includes procedures 318 and data / information 320. The processor 306, for example, the CPU, executes procedures 318 and uses data / information 320 in memory 310 to control the operation of the wireless terminal and to implement the methods of the present invention. Procedures 318 include
WT 300 and wireless procedures. Procedures
<td>which</td><td>implement</td><td>protocols</td>
<td>by</td><td colspan="2">wireless terminal</td>
<td> 324</td><td>control</td><td>terminal</td>
<td> 324</td><td>control</td><td>terminal</td>
<td>module</td><td colspan="2">326 specifying the mode</td>
base station, excitation signaling module 327, module
328 access signaling, link switching signaling module 330, state transition module 332
- WT wireless terminal, module 333 time / synchronization settings, module 334 base station identification, module 336 receiver control, module 338 transmitter control and module 339 user input / output.
[0063] Base station mode determination module 326 uses information 320 data in memory 310 to determine the operating mode that the BS base station that transmitted the received synchronization signals being evaluated, e.g., beacon signals and / or pilot, currently operates in example, broadcast standby mode or active mode. For example, in some embodiments, the reduced pilot tone signaling rate indicates that the BS base station is in transmit standby mode and the detected rate of received pilot tones is used by module 326 to determine the BS base station mode. As another example, in some embodiments, the reduced pilot signal power level indicates that the base station is in transmit standby mode and the level of received pilot signals can be compared with the level of received beacon signals when performing the determination. In some embodiments, the detected level offset in the received pilot tone can indicate a change in base station mode. The BS base station mode determination module 326 includes at least one of the more relative power level determination modules 327 and the speed analysis module 329. The BS base station mode determining module 326 processes the received synchronization signals to evaluate at least one of the synchronization signal power levels and the speed of at least some of the synchronization signals. The relative power level determination module 327 determines the relative power level between at least two
- types of synchronization signals received, e.g., pilot tone and beacon signals. Speed analysis module 329 distinguishes between received synchronization signal rates corresponding to different modes of operation. For example, in some embodiments, the base station uses different pilot tone tone rates for transmit standby mode and base station active mode, and speed analysis module 329 measures the received pilot tone speed and determines the received pilot tone tone mode base station operation. In some embodiments, precise pilot tone measurement is not performed, but the received signals are processed by the speed analysis module 329 to be able to associate the sync signaling level with one of the different base station operating modes. The relative power level determination module 327 and / or the speed analysis module 329 uses the synchronization signal information 341 as input received and generates the synchronization signal information 347 processed as output.
[0064] The base station mode decision module 331 determines the base station operating mode based on the relative power level of at least two different synchronization signals and / or the speed of at least one type of synchronization signal. For example, the processed output synchronization signal 347 from the relative power level determination module 327 and / or the speed analysis module 329 is used by base station mode decision module 331 in combination with BS base station mode detection information 372 to determine the current mode of the station base.
[0065] In some other embodiments, the base station mode determination module 326 determines the operating mode on
-31 based on the downlink signaling level and / or omission of one or more specific types of signals. For example, in some such embodiments, base station mode determination module 326 determines the base station operating mode based on the presence or absence of allocation signals corresponding to uplink traffic channel segments.
[0066] The wake-up signaling module 327 controls the generation and transmission of wake-up signals to the base station BS 200, e.g., the base station BS 200 detected by the module 326 determining that it is in transmit standby mode when the wireless terminal WT 300 wishes to wake up the base station, for example, to register at the base station to change to an active state from the sleep state, so that the WT wireless terminal can send uplink talk channel data, etc.
[0067] Access signal module 328 controls the generation and transmission of access signals to the BS 200 base station, for example, during predetermined access intervals using predetermined tones in the structure of a reverse link time setting and frequency, the access signals not requiring precise synchronization time settings and are used to initiate a registration request from the base station. Connection switching signaling module 330 controls the connection switching operations associated with the WT 300 wireless terminal including control of generating and transmitting the signal requesting switching of the BS base station connection. The state transition module 332 controls the transition operations of the WT 300 wireless terminal and requests transitions that are sent to the BS 300 base station, e.g., transition from the WT wireless terminal's sleep state to the active state of the terminal
-32 wireless
WT and from the active state of the WT terminal to the sleep state of the WT wireless terminal. In some embodiments, the active state of the WT wireless terminal is then authorized to include an active suspended state and an active on state. The state transition request may include state change request signals and requests for uplink radio link resources that may be considered, in some embodiments, as a state change request. In some embodiments, the transition of the WT wireless terminal states are tracked by the BS base station and used by the BS base station to determine the transition of the BS base station modes.
[0068] The timing / synchronization module 333 performs timing synchronization and frequency synchronization operations, e.g., synchronization of the reverse link broadcast of WT wireless terminals to arrive in synchronization with the transmission of other wireless WT terminals in accordance with the structure of the reverse link time settings and frequencies, which are maintained by the BS base station and referenced relative to uplink signaling synchronization signals. In some embodiments, the WT wireless terminal obtains a coarse synchronization level based on received beacon signals and / or pilot signals, and transmits BS base station wake-up signals and / or access signals without the need for a high level of time setting synchronization. The timing / synchronization module 333 achieves a high level of synchronization, for example, within the duration of the cyclic prefix for regular uplink signaling, including uplink talk channel signals, transmitted when the base station is in active mode. Identification module 334
The base station identifies the base station transmitting synchronization signals, e.g., beacon signals, and the identification may include determining the attachment network point associated with the base station, sector and / or carrier frequency. Receiver control module 336 controls the operations of the receiver 302; transmitter control module 338 controls the operation of transmitter 304, and user input / output module 339 controls user input / output devices 308. Some of the WT wireless terminal control modules may work in conjunction with specific operations. For example, transmitter control module 338 may operate in conjunction with the excitation signaling module 327 at specific times.
[0069] Data / information 320 includes data / information 336 about the wireless terminal, information 338 about the access signal, information 340 about the wake-up signal of the base station, information 342 about the call switching signal, information 344 about the status change signal, received information 341 about the synchronization signal , processed synchronization signal information and system data / information 350. Data / information 336 about the WT wireless terminal include user 352 data, information 354 about the device / session / resource, information 356 about the identification of the WT wireless terminal, information 358 about the status of the user of the WT wireless terminal, 360 information about the identification of the base station and information 362 about the mode base station.
[0070] User data 352 includes, for example, data corresponding to voice, video, text, files to be sent to peer WT 300 wireless terminal or received from peer WT 300 wireless terminal. Device / session / resource information 353 includes information on the identification of an equivalent terminal
-34 resources of the wireless terminal WT 300 wireless information in the communication session with the WT 300 wireless terminal, routing information and radio information corresponding to
WT 300, for example, identifying downlink and uplink talk channel segments assigned to the WT 300 wireless terminal when its currently connected BS base station is in active mode of operation. The WT wireless terminal identification information 356 includes identifiers associated with and / or assigned to the WT wireless terminal 300 comprising, for example, a base station assigned to the registered user identifier, a base station assigned to the active user identifier, paging identifier information and / or group identifier information. Wireless terminal user information information identifying whether the WT wireless terminal is in sleep or active state. The user status information 358 of the WT wireless terminal, in some embodiments, also includes additional information identifying whether the WT wireless terminal is in an active on or active suspended state.
base station identification identifying the base station that is used as the current point of the WT wireless network connection terminal and / or information identifying the BS base station with which the WT wireless terminal needs to register and use as a network connection point. For example, the base station ID information 360 may be obtained from received beacon signals and / or received pilot signals. The 360 information on base station mode contains information that identifies the operating mode for base stations,
358
WT with condition contain
Information about 360 contains information
For example, to identify base stations. For example, at any time, the base station may be in transmit standby mode, for example, in a sleep mode of operation having reduced output signals, lower output power and generating less interference, or the base station may be in active mode of operation, for an example that reflects a fully occupied operating mode and supports uplink and forward link talk channel signaling.
[0071] Access signal information 338, including access signal specifications, such as, for example, signal characteristics, including power level information, modulation signal value information and extension part information, is used by access signal module 328 to generate access signals used to register the WT 300 wireless terminal with the base station. BS base station excitation signal information 340 including excitation signal specifications, such as, for example, signal characteristics including power level information, modulation signal value information and extension portion information, is used by excitation module 328 to generate excitation signals used to wake up a base station that is in transmission standby mode. The suspension signal information 342 includes information used to generate the connection switching signals and information derived from the received connection switching signals. The status change information 344 includes information related to changes in the status of the WT 300 wireless terminal, for example, information regarding the change in the status of the message request and information indicating that the BS base station has authorized the change of the state of the WT wireless terminal to
-36 example, assigning an active user ID to the WT wireless terminal.
[0072] The received synchronization signal information 341 includes the received information 343 about the beacon signal and the received information 345 about the pilot signal corresponding to the received forward link synchronization signals received by the receiver 302. The received information 343 about the synchronization signal is used as an input signal for the relative determination module 327 power level and / or speed analysis module 329. The processed sync signal information 347 includes power level information 349 and speed information 351. The processed synchronization signal information 347 includes information output from the relative power determination module and / or the speed analysis module 329 that is used as an input by the base station mode decision module 331. The power level information 349 includes, for example, a specific power level associated with a received beacon, a specific power level associated with the received pilot tone signals, and a relative power ratio between the two types of received signals. The rate information 351 includes information, e.g., about a specific rate of received signal types. In some embodiments, specific pilot tone rates are, for example, a specific number of pilot tone signals transmitted simultaneously in one OFDM symbol transmission time interval. Another example of a determined rate of pilot tone signals is, for example, a ratio of a first number of OFDM transmission time intervals comprising pilot tone signals to a second number of OFDM transmission time intervals during which no pilot tone signals are transmitted.
[0073] The received information 343 about the beacon signal in connection with the processed information 347 about the synchronization signal includes information related to and / or obtained from the received beacon signals, e.g., received signal power level, tones associated with received navigation, time within the structure time settings associated with the received navigation signal, base station, sector and / or carrier associated with the received navigation. The received pilot signal information 345 in connection with the processed synchronization signal information 347 includes information related to and / or obtained from the received pilot signals, e.g., power level of received pilot signals, speed of received pilot signal signaling containing the number of pilot signals per transmission time interval. OFDM symbol and / or a fraction of the OFDM symbol transmission time intervals containing pilot signals, the relative power of the received pilot signals relative to the received beacon signals and / or base station identification information obtained from pilot signals, e.g., base station identifier obtained from pilot slope.
[0074] The system data / information 350 comprises a plurality of sets of base station information (BS 1 364 information, BS N 366 information). BS 1 base station information 364 includes information 368 on active mode, information 370 on standby mode, information 372 on base station mode detection, information 374 on frequency structure and uplink / forward link time settings, and information 376 on station identification base.
[0075] Information 374 about the frequency structure and uplink / forward link timing includes, for example, the link carrier frequency
Reverse link signal, reverse link signal block information, reverse link tone hopping sequence information, reverse link segment information, forward link carrier frequency, forward link tone block information, forward link tone hopping information, symbol transmission time interval information OFDM, information on grouping of OFDM symbol transmission time intervals into half-slots, slots, super-slots, navigation slots, ultra-slots etc. The active mode information 368 contains information related to segments, signals and functions associated with the active mode, for example, talk channel segments and signals, dedicated segments and control channel signals. Broadcast standby information 370 includes information related to segments, signals and functions associated with transmit standby mode, e.g., signals associated with base station wake-up signaling and wake-up operations. The base station mode detection information 372 includes information used by the base station determination module 326 to evaluate received beacon signals and / or a pilot to determine a BS base station operating mode. Information 372 about BS base mode detection includes, for example, speed information and / or power level information associated with each BS base station operating mode that can be used to distinguish between different base station operating modes. For example, information 372 may include pilot speed in each mode and / or relative pilot power level relative to beacon signals in each mode.
The 376 base station identification information includes information that allows the 334 base station ID module
BS specify the BS base station corresponding to the received one
Signals, for example, a set of beacon tones occurring at predetermined frequencies and / or times in terms of forward link time settings and BS1-related frequency structure identifying BS 1 among many base stations in the system. The identification may include identification of the cell, sector and / or carrier frequency used.
[0076] Figure 4 is a drawing 400 of an exemplary time frequency grid reflecting radio link resources for a forward link available to a base station implemented in accordance with the present invention, and an indication of time setting synchronization signals transmitted by a base station using these resources when operating in active mode. The vertical axis 402 represents the tone indicator (0, 1, 2, ... 15) in a tone block, used for downlink signaling by a base station. The horizontal axis 404 represents the time, each unit reflecting one OFDM symbol transmission time interval. Each small square in the grid represents the basic transmission unit, the OFDM tone symbol, corresponding to one tone during one OFDM symbol transmission time interval. The modulation symbol can be transferred corresponding to each OFDM tone symbol of the network. Legend 406 indicates that full shading of the grid square, as shown in legend 408, means that the beacon tone signal at the PB power level occupies the tone symbol. Legend 406 also indicates that the vertical shading line of the grid square, as shown in legend 410, means that the pilot tone signal at the PP power level occupies the tone symbol.
[0077] Figure 5 is a drawing 500 of an exemplary time frequency grid reflecting radio link resources for the forward link available to a base station,
Implemented in accordance with the present invention, and an indication of the synchronization signals of the time settings transmitted by the base station using these resources when operating in the standby mode for the embodiment. The base station may be the same base station corresponding to the description of Figure 4, but now operating in the transmit standby mode and not the active mode. The vertical axis 502 represents the tone indicator (0, 1, 2, ..., 15) in the tone block used for downlink signaling by the base station. The horizontal axis 504 represents the time, each unit reflecting one OFDM symbol transmission time interval. Each small square in the grid represents the basic transmission unit, the OFDM tone symbol, corresponding to one tone during one OFDM symbol transmission time interval. The modulation symbol can be transferred corresponding to each OFDM tone symbol of the network. Legend 506 indicates that full shading of the grid square, as shown in legend 508, means that the beacon tone signal at the PB power level occupies the tone symbol. Legend 506 also indicates that the vertical shading line of the grid square, as shown in legend 510, means that the pilot tone signal at the PPR power level occupies the tone symbol, where PPR <PP. In this embodiment, by reducing the power level of each transmitted pilot signal, the total average transmit power of the base station is reduced in transmit standby mode relative to the active mode of operation.
[0078] Figure 6 is a drawing 600 of an exemplary time frequency grid reflecting radio link resources for the forward link available to a base station implemented in accordance with the present invention, and an indication of the synchronization signals of the time settings transmitted by
- a base station using these resources when operating in transmit standby mode for another embodiment. The base station may be the same base station corresponding to the description of Figure 4, but now operating in the transmit standby mode and not the active mode. The vertical axis 602 represents the tone indicator (0, 1, 2, ..., 15) in the tone block used for downlink signaling by the base station. The horizontal axis 604 represents the time, each unit reflecting one OFDM symbol transmission time interval. Each small square in the grid represents the basic transmission unit, the OFDM tone symbol, corresponding to one tone during one OFDM symbol transmission time interval. The modulation symbol can be transferred corresponding to each OFDM tone symbol of the network. Legend 606 indicates that full shading of the grid square, as shown in legend 608, means that the beacon tone signal at the PB power level occupies the tone symbol. Legend 606 also indicates that the vertical shading line of the grid square, as shown in legend element 610, means that the pilot tone signal at PP power level. In Figure 4, 28 successive OFDM symbol transmission time intervals are shown. In Figure 4, three of the OFDM symbol transmission time intervals contain one beacon tone signal and do not contain any pilot signals, while each of the remaining OFDM symbol transmission time intervals contains 4 pilot tone signals. Compared to Figure 6, the three beacon signal OFDM symbol transmission time intervals remain unchanged; however, the pilot signaling has been reduced. In Figure 6, each of the seven OFDM symbol transmission time intervals includes 4 pilot signals, while the remaining 18 OFDM symbol transmission time intervals contain zero pilot signals. Including
In an embodiment, by reducing the pilot signaling rate, the total average transmit power of the base station is reduced in the standby mode of operation relative to the active mode of operation.
[0079] Figure 7 is a drawing 700 of an exemplary time frequency grid reflecting radio link resources for a forward link available to a base station implemented in accordance with the present invention, and an indication of the synchronization signals of the time settings transmitted by the base station using these resources when in standby mode. for yet another embodiment. The base station may be the same base station corresponding to the description of Figure 4, but now operating in the standby mode and not in the active mode. The vertical axis 702 represents the tone indicator (0, 1, 2, ..., 15) in the tone block used for downlink signaling by the base station. The horizontal axis 704 represents time, each unit reflecting one OFDM symbol transmission time interval. Each small square in the grid represents the basic transmission unit, the OFDM tone symbol, corresponding to one tone during one OFDM symbol transmission time interval. The modulation symbol can be transferred corresponding to each OFDM tone symbol of the network. Legend 706 indicates that full shading of the grid square, as shown in legend 708, means that the beacon tone signal at the PB power level occupies the tone symbol. Legend 706 also indicates that the vertical shading line of the grid square, as shown in legend 710, means that the pilot tone signal is at the PP power level. In Figure 4, 28 successive OFDM symbol transmission time intervals are shown. In Figure 4, three of the OFDM symbol transmission time intervals contain one tone signal
And no pilot signals, while each of the remaining 25 OFDM symbol transmission time intervals contains 4 pilot tone signals. Compared to Figure 7, the three beacon OFDM symbol transmission time beams remain unchanged, however, pilot signaling has been reduced. In the figure. 7, each of the 25 OFDM symbol transmission time intervals contains only one pilot tone. In this embodiment, by reducing the pilot signaling speed, the total average transmit power of the base station is reduced in the standby mode of operation relative to the active mode of operation.
[0080] Figure 15 is a drawing 1500 of an exemplary time frequency grid reflecting radio link resources for a forward link available to a base station implemented in accordance with the present invention, and an indication of time setting synchronization signals transmitted by a base station using these resources in standby mode for transmission for yet another embodiment. The base station may be the same base station corresponding to the description of Figure 4, but now operating in the standby mode and not in the active mode. The vertical axis 1502 represents the tone indicator (0, 1, 2, ..., 15) in the tone block used for downlink signaling by the base station. The horizontal axis 1504 represents the time, each unit reflecting one OFDM symbol transmission time interval. Each small square in the grid represents the basic transmission unit, the OFDM tone symbol, corresponding to one tone during one OFDM symbol transmission time interval. The modulation symbol can be transferred corresponding to each OFDM tone symbol of the network. Legend 1506 indicates that full shading of the grid square, as shown in legend 1508,
-44 means that the beacon tone at PB power level is occupied by the tone symbol. In Figure 4, 28 successive OFDM symbol transmission time intervals are shown. In the figure. 4 three of the OFDM symbol transmission time intervals contain one beacon tone and do not contain any pilot signals, while each of the remaining 25 OFDM symbol transmission time intervals contain 4 pilot tone signals. Compared to Figure 15, three OFDM symbol beacon time beacon signals remain unchanged, however pilot signaling has been eliminated. In this embodiment, by reducing the pilot signaling rate to zero, the total average transmit power of the base station is reduced in transmit standby mode relative to the active mode of operation.
[0081] Figures 4-7 and 15 are provided to explain the concepts of synchronization signaling power and / or rate reduction according to the present invention. The features of the radio link resources, types of synchronization signaling, amount of power reduction and / or amount of speed reduction may vary depending on the system type and system specifications.
[0082] In one example, an OFDM wireless communication system for a base station operating in an active mode, for example, the OFDM symbol transmission time interval is approximately 100 microseconds, the downlink tone block contains 113 adjacent tones, the beacon takes one tone for two consecutive OFDM symbol transmission time intervals, beacons appear once during the beacon slot 912 OFDM symbol transmission time intervals and pilot tone that can be transmitted during each of 896 OFDM symbol transmission time intervals
-45 during the beacon slot, and the pilot signals make up approximately 18% of the base station's transmit power. In some such exemplary systems, the base station in transmit standby has a reduced pilot signaling level, e.g., one pilot tone for every eight OFDM symbol transmission time intervals, where pilot tone symbols were previously transmitted in the active mode. This exemplary base station operating mode in transmit standby corresponds to one pilot tone for each of the 112 OFDM symbol transmission time intervals in the beacon slot. In some such embodiments, the beacon signaling is unchanged between the two base station operating modes. Although the beacon signal is usually transmitted at a much higher power level than the pilot signal, it is transmitted at a much lower frequency, and the energy is concentrated on one or several tones, which reduces damage due to interference. However, pilot signals are transmitted much more often and absorb a significant portion of the base station's transmit power when the mode is active; therefore, reducing or limiting the pilot signaling in transmit standby mode can achieve more
In addition, some base stations do not transmit downlink talk signals when in standby mode, thereby further reducing base station transmit power and interference levels.
[0083] In another type of wireless communication system, for example, a CDMA system, extension code synchronization signals may be used, and the power level and / or the number of extension code synchronization signals are a favorable reduction of these examples of interference.
performance,
-Reduced when operating in transmit standby mode compared to the active mode.
[0084] Figure 8 is a drawing 800 illustrating an exemplary base station, BS K 804, with a cellular network coverage area, cell K 802. Cell K 802 includes two exemplary wireless terminals (WT A 806, WT B 807) coupled to a BS K base station 804 via wireless connections (808, 809), respectively. The BS K 804 base station may be compatible with the exemplary BS 200 base station of Figure 2, while the WT A wireless terminal and the WT B wireless terminal may be compatible with the exemplary WT 300 wireless terminal of Figure 3. The BS K 804 base station is currently in the active mode of the base station; the WT A 806 wireless terminal is in an active WT enabled state of the wireless terminal; The WT B 807 wireless terminal is in the active suspension state of the WT wireless terminal.
[0085] Figure 9 is a drawing 900 illustrating an exemplary base station, BS L 904, with a cellular network coverage area, cell L 902. Cell L 902 includes two exemplary wireless terminals (WT C 906 WT D 908). The BS L 904 base station can be compatible with the exemplary BS 200 lilac station of Figure 2, while the WT C 906 wireless terminal and the WT D 908 wireless terminal can be compatible with the exemplary WT 300 wireless terminal of Figure 3. The WT C 906 wireless terminal and the WT D 908 wireless terminal are currently in an off state. There are no WT wireless terminals in the L cell currently supported by the BS L 904 base station, and the L 904 base station is currently in standby mode. [0086] Figure 10 is a drawing 1000 illustrating an example base station, BS P 1004, with cellular network coverage area, cell P 1002. Cell P 1002 includes
-47 two exemplary wireless terminals (WT E 1006, WT F 1007) The BS P 1004 base station may be compatible with the exemplary BS 200 base station of Figure 2, while the WT E 1006 wireless terminal and the WT F 1008 wireless terminal may be compatible with the exemplary WT 300 wireless terminal of Figure 3. The BS P 1004 base station is currently in operating standby mode. The WT E 1006 wireless terminal is currently turned off and is not supported by the BS P 1004 base station. The WT F 1008 wireless terminal is currently in sleep mode and is coupled to the BS P 1004 base station via a 1010 wireless link. Currently there are no terminals wireless WT in cell P 1002 supported by the BS P 1004 base station, which would be in an active working state.
[0087] Figure 11 is a drawing of a table 1100 illustrating the characteristics of an active base station operating mode and a base station operating mode in broadcast standby for the embodiment in accordance with the present invention. The first information column 1102 lists information related to the active mode of the base station. Second column 1104 of information exchanges information related to the standby mode of transmitting the base station. First line 1106 indicates that in base station active mode, BS base station can support WT wireless terminals in active mode and WT wireless terminals in sleep mode, while in BS base station standby mode, BS base station can support terminals wireless WT in vertical operation mode.
[0088] The second line 1108 indicates that the beacon signals in the embodiment are transmitted in both active operating mode and transmit standby mode. Including
In the embodiment, the navigation signaling is the same regardless of the base station operating mode. In some embodiments, the beacon signal is a relatively high power signal occupying one or several, e.g., two or three or four tones for several, e.g., one or two or consecutive OFDM symbol transmission time intervals. In some such embodiments, other tones of the downlink tone block are left unused when transmitting the beacon. In some embodiments, the beacon signaling may differ in two modes, such that the power and / or speed is reduced in the active signal in the standby mode compared to the mode. In some embodiments, the beacon can contain one or several high power tones and a large number of low power tones, e.g., 25 to 75 tones from a 113 tone tone block that are transmitted during the same OFDM symbol transmission interval or periods. . In some such embodiments, in the standby mode of transmission for high power tone there may be no interaction, but the speed and / or power level of the low power tone may be reduced relative to the active mode. [0089] Third line 1110 indicates that pilot signals are transmitted in both active and standby modes; however, the pilot signal transmission speed and pilot signal power level in this embodiment is reduced in transmit standby mode relative to the active mode.
embodiments, one position: (and pilot signal and (ii) pilot signal signaling speed is reduced in transmit standby mode compared to the active mode of operation.
At some power level
[0090] The fourth row 1112 indicates that uplink and forward link talk channel data is transmitted in this embodiment in the base station active mode but not in the base station standby mode.
[0091] The fifth line 1114 indicates that paging signals are transmitted in both active mode and transmit standby mode. In some embodiments, the paging signaling may be transmitted at different speeds and / or may have different properties depending on the base station operating mode. For example, in active mode, paging opportunities may occur more often than in transmit standby mode. In addition, in some embodiments, paging signals in an active mode may convey more information and / or may have a structure that allows faster response of the WT to which the paging is directed.
[0092] Figure 12 is drawing 1200 illustrating an exemplary communication system implemented in accordance with the present invention and using methods of the present invention. Figure 12 includes a plurality of base stations (BS 1 1210, BS 2 1212, BS 3 1214), each corresponding to a cellular coverage area respectively (cell 1 1216, cell 2 1218, cell 3 1220). Train track 1202 is shown with an exemplary train 1204 located on track 1202. Basically, more than one train can operate in an area covered by a communication system at the same time. Exemplary train 1204 includes many mobile nodes (MN 1 1206, MN N 1208).
[0093] The exemplary communication system also includes a node
1222 networks connected to (BS 1 1210, BS 2 1212, BS 3 1214), respectively using wireless connections (1226, 1228,
-501,230). Network node 1222 is coupled to other nodes on the network and / or the Internet using a 1232 network link. The network links (1226, 1228, 1230, 1232) may be, for example, fiber links, cable links, and / or high-speed wireless links performance, such as targeted microwave links. Network node 1222 contains distribution information 1224.
[0094] Timetable information 1224 includes train timetable information, for example, identifying when a train or trains will be within each of the BS's base station's coverage area. Network node 1222 by transmitting schedule information and / or information obtained from BS base station schedule information, may affect base station switching from standby to transmit mode to active mode and from active mode to transmit standby mode. For example, network node 1222 may send schedule information to each BS base station, and the BS base station may switch accordingly. Alternatively, the network node may use distribution information to determine when to issue command mode switching signals to each base station to request base station mode switching operations.
[0095] In some embodiments, information obtained from train tracking and / or train position detection mechanism, such as track sensors, for example, already in place and used to prevent collision is used to control the transition of base stations from active mode to mode in ready to transmit and from ready to transmit in active mode. In some embodiments, there is a controlled base station of base station mode transition along track 1202, e.g., directed through
- node 1222 of the network, taking into account the current location of train 1204, direction of train 1204 and speed of train 1204.
[0096] Consider, as an example, that track area 1202 that runs through cells 1216, 1218 and 1220 is a fairly remote rural area with very low population density. In this embodiment, when train 1204 is not in the cell (1216, 1218, 1220), it may be beneficial to place the base station (1210, 1212, 1214) in transmit standby mode, thereby reducing transmit power and reducing interference ; however, when the train is just appearing in the cell or is in the cell (1216, 1218, 1220) it may be beneficial for the base station to be in active mode. In some embodiments, there may be connections along the tracks with adjacent base stations passing between modes when the MN mobile nodes (1206, 1208) of the train are switched from one base station to the next. Reduced interference may be particularly beneficial in cell boundary areas, for example, in a cell boundary area bordering a region with a higher population, where another neighbor base station can usually be operated continuously in an active mode of operation.
[0097] In some embodiments, under certain conditions, the base stations are instructed to be in broadcast standby mode when the train is near or at a specific location, for example, a bridge or tunnel, for example, for safety purposes.
[0098] The described methods in the embodiment with respect to the train of Figure 12 also apply to other transport networks. For example, base stations can be located along flight route and mode
The base station of the transition operation can be coordinated with the flight schedule information.
[0099] Figure 13 comprising the combination of Figure 13A, Figure 13B, and Figure 13C is a flowchart 1300 of an exemplary method of operating a base station in accordance with the present invention. An exemplary base station may be base station 200 of Figure 2. The exemplary method starts in step 1302 when the base station is turned on and initialized. Operation proceeds from step 1302 to step 1306, step 1308, and by attaching node A 1303 to step 1304.
[0100] In step 1306, the base station is set to active mode, and then in step 1310, the base station is operating in active mode. The operations of step 1310 include during the first period of time transmitting synchronization signals at the first rate. For example, the synchronization signals may include a combination of beacon signals and pilot signals. In some embodiments, the active mode of operation may be considered as the operating state of a fully occupied base station, an operation capable of serving one or more active users and supporting uplink and uplink talk channel signaling. The first synchronization signaling speed may be such as to handle relatively fast synchronization and channel estimation for WT wireless terminals served by the base station. The operation proceeds from step 1310 to step 1312.
[0101] In step 1312, the base station is operated to check if there are any WT wireless terminals that are served in the active state. For example, WT wireless terminals can register at a base station that wants to use them as a network connection point. For example, a registered terminal
The wireless may be in different states at different times, for example, in sleep or active state; the active state may additionally be authorized to enable the active suspension state and the active enable state. The BS base station may control the transition of the WT wireless terminals to the active state, and the control operations may include assigning active user identifiers to the WT wireless terminals. The BS base station can track the number of users currently in the active state. If at step 1312 it is determined that there are no WT wireless terminals supported in the active state of the WT wireless terminal, e.g., no WT wireless terminals currently registered in the BS base station that is supported are currently not in the active state, then the operation proceeds to step 1314; otherwise, the operation proceeds to step 1316. In step 1316, the base station after determining that there is at least one registered WT wireless terminal in the active state, resets the inactivity counter. Operation proceeds from step 1316 back to step 1312, where the base station again checks to see if there are any WT wireless terminals supported in the active state.
[0102] In step 1314, the inactivity counter is increased. Operation proceeds from step 1314 to step 1318. In step 1318, the base station checks if the inactivity counter has exceeded a predetermined limit. If the counter exceeds the predetermined limit, the operation goes to step 1320, otherwise the operation returns to step 1312, where the base station again checks if there are any WT wireless terminals or not that are served in an active state.
[0103] In step 1320, the base station is operated to transition the base station to transmit standby mode. The standby mode is the base station's operating state, in which the base station does not support active users, but can support users in sleep mode, and in which the base station is operated to achieve lower average output power than in active mode , thus creating less interference in the system. Operation proceeds from step 1320 to step 1322. In step 1322, the base station is operated in a transmission-ready mode that includes during a second period of time during which synchronization signals are transmitted, with synchronization signals transmitted at least one positions: i) a lower speed than in the active mode, and ii) at a lower power level than synchronization signals transmitted in the active mode. In some embodiments, some synchronization signals, e.g., beacon signals, may be the same in both base station operating modes, while other synchronization signals, e.g., pilot signals, may be reduced in power level and / or speed when they are in the transmission standby mode.
[0104] Returning to step 1304, in step 1304, the base station is served to track the current time. Operation proceeds from step 1304 to step 1324. In step 1324, the base station checks to see if the current time indicates that the base station should go into mode according to the schedule information. For example, the BS base station may be located in a remote rural area and may switch modes depending on whether the train including the mobile wireless terminals is currently or not in the vicinity of its cellular coverage area based on timetable information
- 55 trains either stored and / or sent to the base station. If the current time does not indicate that the base station should go into mode, the operation proceeds from step 1324 back to step 1304. However, if the current time indicates that the mode transition should be based on schedule information, then the operation proceeds from step 1324 to step 1326.
[0105] In step 1326, the base station is operated to determine whether the transition should be in active mode, in which case the operation goes to step 1328, or into a standby mode, in which case the operation goes to of step 1330. At step 1328, the base station checks if the BS base station is already in an active state, in which case no further action is necessary in connection with this transition. However, if in step 1328 it is determined that the BS base station is not in active mode, then the operation proceeds from step 1328 to step 1332, where the base station is operated to switch to active mode. Operation proceeds from step 1332, by connecting the F 1334 node, to step 1310, where the base station is operated in active mode.
Returning to step 1330, at step 1330, the base station checks if the BS base station is already in transmit standby mode, in which case no further action is necessary in connection with this transition. However, if it is determined in step 1330 that the BS base station is not in transmit standby mode, then the operation proceeds from step 1330, by attaching the G node 1336, to step 1320, where the base station is operated to switch to ready to broadcast.
[0107] Returning to step 1308, in step 1308 the base station is operated to receive signals over wireless links and a connection network interface
-56 to register the use of this connected waiting interconnection on a regular basis. The operation proceeds from step 1308, by attaching the nodes (B 1338, C 1346, D 1352, E 1364, J 1365), corresponding to the stages (1340, 1348, 1354, 1366, 1367).
[0108] In step 1340, the base station monitors the access signal y from the WT wireless terminals seeking to become a BS base station for the base station as its network attachment point. Operation proceeds from step 1340 to step 1342, where the base station checks if an access signal has been received or not. If no access signal has been received, the operation returns to step 1340; otherwise, the operation goes, by attaching the H node 1344, to step 1328, where the BS base station checks whether the BS base station is currently in active mode or not. Returning to step 1348, in step 1348, the base station monitors the excitation signals, e.g., via wireless links from WT wireless terminals and / or via an interconnection network. The excitation signal via an interconnection network may originate from the WT wireless terminal, from a central command node, or from another network node such as an adjacent base station. For example, a wireless terminal of a currently neighboring BS base station, performing a call hold operation leading to a call hanging on a base station that is attempting to wake up, may initiate the wake-up signal and send that signal via the current network connection point. The WT wireless terminal can initiate this wake-up signal so as to obtain uninterrupted transmission of user data, and the wake-up signal information is ultimately sent to the BS base station in standby mode for broadcasting via the network to another soon
-57 interconnections. As another example, a centralized network control node may send a BS base station wake-up signal via interconnection, e.g., by means of a centralized control node implementing control according to train timetable information. As another example, another base station, for example, an adjacent base station having information about active mobile users approaching the outer border of the BS base station cell may send an excitation signal to the BS base station via interconnections such that the BS base station can pass to active mode and be ready for active mobile users when they enter their cell. As yet another example, the WT wireless terminal in the coverage areas of the base station's cellular network either recently powered or in sleep state could detect that the BS base station is in transmit standby mode, and the WT wireless terminal generates and sends an excitation signal to the BS base station behind using the wireless channel. Operation proceeds from step 1348 to step 1350, where the base station checks whether the wake signal has been received or not. If the excitation signal has not been received, the operation returns to step 1348; otherwise, the operation goes, by attaching the H node 1344, to step 1328, where the BS base station checks whether the BS base station is currently in active mode or not.
Returning to step 1354, in step 1354, the base station monitors call suspension signals, e.g., via wireless links from WT wireless terminals and / or via an interconnection network. Operation proceeds from step 1354 to step 1356, where the base station checks to see if the call hold signal remains
-58 received or not. If the call switching signal has not been received, the operation returns to step 1354; otherwise, operation proceeds to step 1358. In step 1358, the base station determines whether or not the operating mode change should be performed as a result of the received call switching signal. For example, we consider the case that the received call switching signal is done over a wireless link from the last currently registered wireless terminal supported by the base station, and then after completing the call switching, the base station may go into standby mode. However, if such a received call switching signal was received while other registered WT wireless terminals were still in an active state within the cell, a change of base station mode would not be appropriate. As another example, we consider the case that the call switching signal is via an interconnection network, indicating that the active wireless terminal is attempting to switch to the base station and that the base station is currently in standby mode. In such conditions it would be appropriate to switch the base station into active mode. However, if the base station was already in active mode, when such a hold call was received via an interconnection network, no base station mode transitions would be necessary. If in step 1358 the base station determines that a change of mode should take place, the operation proceeds to step 1360; otherwise, no further operations are performed to initiate a mode change in response to this received call switching signal.
We are currently considering [0111] In step 1360, the base station proceeds depending on the direction in which the mode transition takes place. If the mode transition occurs to active mode, the operation proceeds from step 1360, by attaching node I 1362, to step 1332. If the mode transition enters the standby mode, the operation proceeds from step 1360, by attaching node G 1336, to step 1320 .
[0112] Returning to step 1366 in step 1366, the base station monitors status change signals, for example, over wireless links from currently registered WT wireless terminals. For example, a registered WT may request a transition from the dormant state to an active state such that it can transmit and receive user data. Operation proceeds from step 1366 to step 1368, where the base station checks if a state change request signal has been received or not. In some embodiments, a request for additional radio link resources, e.g., a request for a traffic channel segment, can be seen as a state change request signal. If the status change signal has not been received, the operation returns to step 1366; otherwise, operation proceeds to step 1370. In step 1370, the base station determines whether or not the change of operating mode should be performed as a result of the received WT wireless terminal change signal. For example, the case that the state change signal is from a registered wireless terminal served by the base station in a dormant state requesting a change to an active state, and the base station is currently in the standby mode, then the BS base station should implement the mode change to active. However, if such a received WT wireless terminal change signal was received while
-60 base station was already in active mode, no change of base station mode would be necessary. If in step 1370 the base station determines that a mode change should take place, the operation proceeds to step 1360, otherwise no further operations are performed to initiate the base station mode change in response to this received WT wireless terminal change request signal. .
[0113] Returning to step 1367 in step 1367, the base station monitors the mode change signal, for example, commands via an interconnection network indicating that the BS base station should change its operating mode. For example, the network control mode or node of a neighboring base station may have decided to temporarily instruct the BS base station to exit the active mode and go into standby mode due to any of a variety of conditions, such as interference testing, load conditions, distribution, safety considerations, etc. Operation proceeds from step 1367 to step 1369, where the base station checks if a mode change request signal has been received or not. If the mode change signal has not been received, the operation returns to step 1367; otherwise, operation proceeds to step 1371. In step 1371, the base station determines whether or not the operating mode change should be performed as a result of the received base station status change signal. For example, different mode change criteria may be used depending on the source of the mode change signal and / or the current conditions of the base stations. Some received mode change signals are considered commands that the base station performs without additional conditioning, while other received mode change signals are considered as requests, with the base station being free to change the mode. For example, if the mode change command was issued by
- a centralized control node and was issued for security reasons, a change of mode can be implemented without additional conditions. Alternatively, if the mode change signal was a suggestion to go into standby mode, based on a timetable, e.g., a train schedule, and there are additional active registered users outside the train, commands may be ignored by the base station. If in step 1371 the base station determines that a mode change should take place, the operation proceeds to step 1360; otherwise, no further operations are performed to initiate a mode change in response to the received BS base mode change signal.
[0114] Figure 14 is a drawing 1400 of a state diagram of an exemplary base station implemented in accordance with the present invention. The exemplary base station may be base station 200 of Figure 2. The exemplary base station includes exemplary state 1 1402, otherwise known as base station active mode, and exemplary state 2 1404, otherwise known as base station standby mode. The arrows indicate the conditions causing the state to pass. The transition of the state from the active mode of the base station 1402 to the mode of operation 1404 in readiness for broadcasting the base station may be a response to: detected period of inactivity 1406, distribution information 1408, received signal 1409 change of base station mode, detected transition of at least one wireless terminal from active to sleep 1410, e.g., the transition whereby the entire wireless terminal currently registered with the base station is in a sleep state.
The transition from the 1404 operating mode ready to transmit the base station to the active 1402 base station operating mode may be the answer to: information
Timetable, received access signal 1414, received excitation signal 1416, received signal 1418 on hold, received signal 1420 of the WT wireless terminal change, e.g., status change request signal or received base station mode change signal 1422.
[0115] Figure 16 is a drawing 1600 illustrating a series of operations for successive moments of time in an embodiment of the present invention. Each scheme (1601, 1603, 1605, 1607, 1609 and 1611) represents operations for subsequent moments of time for the exemplary cell A 1602. Scheme 1601 illustrates that cell A 1602 includes an example base station A 1604, operating in standby mode broadcasting, sometimes referred to as vertical base station operating mode. For this example BS 1604 base station, when operating in transmit standby mode, this BS 1604 base station transmits beacon 1606 but does not transmit pilot signals.
[0116] Scheme 1603 illustrates that a WT 1608 wireless terminal has entered a cell or has turned on in a cell and received beacon 1606. The WT 1608 wireless terminal identifies the BS A 1604 base station from the recovered beacon information and recognizes that the BS 1604 base station is in transmit standby mode, for example, in the absence of pilot signals.
[0117] Scheme 1605 illustrates that the WT 1608 wireless terminal sends an excitation signal 1610 to the BS A 1604 base station. The excitation signal 1610 is implemented for easy detection without the need for precise synchronization of time settings, for example, a relatively high power signal at a known location with settings uplink and frequency structure with the duration of two OFDM symbol transmission time intervals. In some
63 embodiments, the excitation signal 1610 is implemented for easy detection without the need for any synchronization of time settings between the WT 1608 wireless terminal and the BS 1604 base station, e.g. when the BS base station in broadcast standby mode constantly monitors certain predetermined tones for the signal excitation. In some embodiments, the excitation signal 1610 has the same features as the access signal typically used to register an active base station.
[0118] Scheme 1607 indicates that base station 1604 recognized the excitation signal 1610 and went into active mode, for example, resuming normal channels used for controlling and signaling user data including pilot signals 1612. Scheme 1609 indicates that the WT 1608 wireless terminal recognized that the BS 1604 base station is in active mode and the WT 1608 wireless terminal transmitted an access request signal 1614, e.g., during one of the access intervals of the reverse link time setting and frequency structure using the segment competitive access. Scheme 1611 indicates that conventional registration of the WT A 1608 wireless terminal has been completed and the WT A 1608 wireless terminal has been accepted as the active user by the BS A 1604 base station. The BS A 1604 base station assigns the WT A wireless terminal to uplink and downlink talk channel segments , through which user data signals 1616 are transmitted.
[0119] Figure 17 is a drawing 1700 illustrating a portion of an exemplary OFDM uplink time setting and frequency structure. At the base station, you can refer to the uplink timing settings relative to the settings
A forward time link, e.g., relative to the forward link beacon. The vertical axis 1702 indicates the reverse link tones and includes the reverse link tone block 1701, for example, consisting of 113 adjacent tones. The horizontal axis 1704 represents time. The structure of the reverse link timing includes access intervals 1706, 1706 'and regular reverse link signaling intervals 1708. Access intervals, e.g., access interval 1706, may be used for access signals, e.g., registration request signals and base station wake up request signals. In some embodiments, depending on the base station operating mode, at least some of the access interval tone symbols are used for various purposes. At least some of the signals transmitted by the WT wireless terminal during the access interval need not be precisely synchronized in time with respect to the base station, while the signals transmitted by the WT wireless terminal during the regular uplink signaling interval 1708 usually have precise timing synchronization, for example, within the duration of the cyclic prefix. In some embodiments, signaling during an access interval uses contention based segments, while signaling during a regular uplink signaling interval uses allocated or assigned segments. Regular uplink signaling intervals can be used for various signaling including assigned uplink talk channel segment signaling and uplink dedicated control channel signaling.
[0120] Figure 18 is drawing 1800 illustrating exemplary radio link access compartment resources for
Reverse link, exemplary segments, and exemplary signaling corresponding to an active base station operating mode and a base station operating mode in readiness to transmit, in accordance with some embodiments of the present invention. The time frequency grid 1802 contains 48 tone symbols, each tone symbol being represented by a small square block, and each tone symbol representing radio link resources for one tone reverse link for one OFDM symbol transmission time interval. Time frequency grid 1802 includes a reverse link tone block 1804 composed of 16 adjacent tones (tone 0, tone 1, ..., tone 15), and has an access interval 1806, where the access range includes three successive intervals (1808, 1810, 1812) the broadcasting time of the OFDM symbol. In some embodiments, the access interval has different durations, e.g., 8 consecutive OFDM symbol transmission time intervals.
[0121] Time frequency grid 1814 shows a time frequency grid 1802 divided during the base station's active mode of operation to include two access segments. In some embodiments, a portion of the radio link resources for the reverse link during the access interval is reserved for access segments. Legend 1816 indicates that the tone symbols that are part of the first access segment are marked by shading in 1820, while the tone symbols that are part of the second access segment are marked by shading in vertical and horizontal lines 1822. During the active mode of the base station, the wireless terminal seeks to register with the base station and use the base station as its network connection point, uses one of the segments
-66 access to give the access request signal. In some embodiments, the WT access terminal randomly selects one of the access segments to use it to send its uplink access registration request signal. The time frequency grid 1814 'represents the time frequency grid 1814, but also includes an additional access request signal shown with an oblique shadow line 1824. Access request signaling is transmitted at the PAC level of power per tone, and the WT wireless terminal does not need to be precisely synchronized in time with respect to the base station, for example, the time setting synchronization error may be greater than the duration of the cyclic OFDM symbol prefix, but it is small enough so that the access request signal can be recognized by the base station and should be received at the base station within the access segment time constraints.
[0122] Time frequency grid 1826 shows time frequency grid 1802 during base standby mode; grid 1826 contains at least one excitation segment. Legend 1828 indicates that the tone symbols that are part of the excitation segment are represented by shading in the form of dot 1830. During the standby mode of transmitting the base station, the wireless terminal striving to wake up the base station, which causes the base station to switch from standby mode to transmit to the active mode, uses the excitation segment to transmit the excitation signal. The time frequency grid 1826 'represents the time frequency grid 1826 but also includes an additional excitation signal represented by shading in the form of vertical lines 1832. Excitation signaling is given at the PWU level of power per ton, where
-67PWU> PAC for the same WT wireless terminal, in the same location with the same beacon detected and having the same amount of battery charge remaining. The WT wireless terminal does not need to be precisely synchronized in time with respect to the base station, for example, the time setting synchronization error may be greater than the duration of the cyclic prefix of the OFDM symbol, but it is small enough so that the wake signal can be recognized by the base station and should be received at the base station within the time segment of the access segment. In accordance with some embodiments of the present invention, the number of tones used simultaneously for the excitation signal is reduced, for example, to one of the many tones used simultaneously for the access request signal, enabling the WT wireless terminal to significantly increase the transmit signal power per tone increasing the probability that the base station will successfully detect the wake signal.
[0123] In some embodiments, in transmit standby mode, the base station turns off all transmit signaling except the minimum signaling set so that the wireless terminal can use to detect the presence of the base station and / or determine the coarse synchronization level. In some such embodiments of OFDM, this minimum signaling set is beacon signaling, and beacon signals may be transmitted at the same or reduced power level with respect to the active mode of operation. In some embodiments of OFDM, this limited set of signals may be beacon and pilot signals where pilot signals are transmitted
At reduced power and / or speed with respect to signaling in active mode. In some embodiments, the wireless terminal upon detection of the base station, e.g., by means of received navigation, and requiring the base station to wake up sends the wake signal to the base station; the base station, after detecting the wake-up signal, reactivates the normal channels of the base station going to the active mode. In various embodiments, the excitation signal is intended for easy detection without the need to synchronize time settings or precisely synchronize time settings. For example, in an exemplary OFDM embodiment, the excitation signal may be a double symbol tone at a known location in the uplink and frequency structure time settings. In some embodiments, the excitation signal may be a signal transmitted at a relatively high uplink transmission power level, the signal being longer in duration than the normal modulation symbol value for a single OFDM tone symbol, and wherein the signal is transmitted in two or more successive OFDM symbol transmission time intervals. In some embodiments, the regular access signal may be considered to be a wake-up signal if the base station receiving the signal is in transmit standby mode. In some embodiments, the same radio link resources reserved for access signals may be reserved and used for excitation signals. In some such embodiments, access signals may differ from excitation signals.
[0124] Figure 19 is a flowchart 1900 of an exemplary method of operating a wireless terminal, for example, a mobile node in accordance with the present invention.
An exemplary method of operation, including the establishment of a user data channel with a base station for transmitting uplink data, begins in step 1902. For example, a wireless terminal may turn on or initialize in step 1902 and require the establishment of a communication link for a reverse link with an attachment point to base station network corresponding to the coverage area of the cellular network in which it is located. As another example, a wireless terminal may be currently registered at the base station in which the cell is located, but may be in the dormant state of the WT wireless terminal and in step 1902 it begins initiating operations to transition to the active state of the WT wireless terminal. As another example, the wireless terminal may be an active user with a different point of attachment to the base station network located adjacent to the new base station that seeks to establish a user data channel and the wireless terminal enters the border area. The operation proceeds from the initial stage 1902 to stage 1904.
[0125] At step 1904, the wireless terminal determines whether the base station it is attempting to establish a user data channel in is in a limited state of activity. Step 1904 includes sub-step 1906 and sub-step 1908. In sub-step 1906, the wireless terminal receives a synchronization signal from a base station. Then, in sub-step 1908, the wireless terminal performs the determination of the base station operating mode based on the received synchronization signals.
[0126] In some embodiments, sub-step 1908 includes sub-step 1910, where the wireless terminal evaluates signal power levels to determine the base station operating mode. In some embodiments, higher levels
- 70 signal strengths of at least some types of synchronization signals indicate a fully enabled base station operating mode, while lower signal strength levels of the same types of synchronization signals indicate limited synchronization operating mode signaling, e.g., sleep mode of base station operation. In various embodiments, the synchronization signals comprise at least two types of signals, and the relative power of the two types of signals indicates the base station's operating mode. In some such embodiments, at least two types of signals include a first type of signal which is an OFDM beacon signal and a second type of signal which is a pilot tone signal, where the beacon tone signal has a power per tone at least three times such as signal strength per pilot tone. In some such embodiments, the transmit power level per OFDM beacon tone is the same in both the base station sleep mode and the base station active mode; however, the pilot signal of transmit power per tone is reduced in the sleep mode of the base station with respect to the active mode of the base station.
[0127] In some embodiments, sub-step 1908 includes sub-step 1912, in which the wireless terminal determines the rate at which the first type of synchronization signals is received and correlates the specific rate with the respective base station operating mode. In some such embodiments, the first type of synchronization signals are pilot tone signals. In some such embodiments, the base station is defined to be in limited synchronization mode signaling, e.g., in sleep mode of the station
Base when the specified speed is below a predetermined threshold.
[0128] Operation proceeds from step 1904 to step 1914. In step 1914, the operation of the wireless terminal proceeds along different paths depending on whether the base station is in limited operational state activity or not. If the base station is in a limited state of activity, e.g., the sleep state of the base station, then the operation proceeds from step 1914 to step 1916; however, if the base station is not in a limited state of activity, for example, the base station is in full activation of the base station active mode, then the operation proceeds from step 1914 to step 1926.
[0129] In step 1916, the wireless terminal transmits the signal used to call the base station to pass
<td colspan="2">to more active</td><td>signaling</td><td>sync</td><td>mode</td>
<td>working</td><td>e.g,</td><td>transmits a signal</td><td>excitation</td><td>signal</td>
<td>works</td><td>access, signal</td><td colspan="2">put the call on hold or</td><td>signal</td>
<td>works</td><td>state transitions.</td><td></td><td></td><td></td>
<td> [0130]</td><td>In some</td><td>examples</td><td>performance,</td><td>signal</td>
used to call the base station to switch to more active synchronization signaling of the operating mode is an excitation signal. In some such embodiments, the characteristics of the excitation signal are such as to provide easy detection by the base station in sleep mode. In some embodiments, the excitation signal contains less than 5 OFDM tones. In some such embodiments, the excitation signal uses single OFDM tones. In various embodiments, the excitation signal is transmitted for an uninterrupted period of time lasting more than one period of OFDM symbol transmission time. In various embodiments, the excitation signal is transmitted such that the signal
It takes more than one OFDM symbol transmission time interval, for example, 2 successive OFDM symbol transmission time intervals and the wireless terminal does not need to be precisely synchronized in time with respect to the base station, for example, the time setting synchronization error may be larger than the cyclic prefix OFDM, but it is small enough that the excitation signal can be detected by the base station, for example, the wireless terminal is synchronized with the base station within the OFDM symbol transmission time interval. In some embodiments, the predetermined set of tone excitation signals is used for some embodiments, the predetermined set of tones comprises at most one tone. In various embodiments, the excitation signal is transmitted by the wireless terminal at a power level per tonne that is higher than the average power level used by the wireless terminal to transmit user data. In some such embodiments, the excitation signal is transmitted by the wireless terminal at the highest power level per tone used by the wireless terminal. In some embodiments, the excitation signal is transmitted using one of the tones used to signal the access request.
[0131] In some embodiments, the signal used to call the base station to transition to a more active synchronization of the operating mode signaling is the access request signal, and the wireless terminal operates differently after the access request signal has been transmitted, if the access request signal has been transmitted, to the base station in a limited synchronization signaling mode than if the transmission was to the base station in full activation of the signaling mode
-73synchronizacji. In such an embodiment, the base station performs various processes in response to the received access request signal depending on the current mode of base station operation.
[0132] In some embodiments, in which the wireless terminal is currently connected as an active user via a wireless link to a current base station located in an adjacent base station to which the wireless terminal aims to excite and establish a user data channel, wherein the signal used to call the base station to switch to the more active synchronization mode is transmitted by the current base station as part of the call switching operation. For example, the wireless terminal may be in a sector or cell boundary area and provide for switching network connection points at the base station, and thus transmit such a signal to its current network connection point, and the signal may be sent, e.g., via a network interconnection connections to the base station that needs to be woken up. In this way, connection hold delays can be minimized.
[0133] In some embodiments, in which the wireless terminal is already registered at the base station such that the wireless terminal tends to cause a transition to a more active synchronization signaling mode and the wireless terminal is in the sleep mode of the wireless terminal in which the wireless terminal is not transmitting user data, wherein the signal used to call the base station to switch to a more active synchronization mode is a signal to request a state transition, e.g., a request via a wireless terminal to switch from a sleep mode
-74 WT wireless terminal for active WT wireless terminal mode.
[0134] Operation proceeds from step 1916 to step 1918. In step 1918, the wireless terminal waits for a period of time for the base station to go to the ON state. In some embodiments, the wireless terminal monitors changes in base station signaling, for example, in terms of speed and / or power level of base station signaling to confirm that the base station has switched to an active state of operation. In some embodiments, the wireless terminal repeats a signal intended to cause a transition if the base station mode transition is not observed within a predetermined amount of time, e.g., within the number of OFDM symbol transmission time intervals or at an expected point within the structure time settings, for example, the beginning of the next slot in the structure of the forward link time settings after taking into account the signaling of transmission times and the transition of the base station mode.
[0135] Then, in step 1920, the wireless terminal transmits registrations and / or base station access request signals, e.g., access request signals using a contention based segment in a reverse link time setting and frequency structure associated with the base station. For example, for a wireless terminal new for a cell, a complete sequence of registration and signaling of access requests may occur. However, for the wireless terminal currently registered in the base station, but in the WT wireless terminal sleep mode, the WT wireless terminal may have a registered user identifier, but may seek to achieve an active identifier
-75 user and can initiate synchronization of the closed loop time settings.
[0136] The operation runs from step 1920 to step 1922, where the wireless terminal performs closed-loop time control based on feedback signals from the base station. In some embodiments in which the wireless terminal is switched between two network attachment points in a base station corresponding to the same cell, for example, two attachment points to a sector of the same base station or two carrier frequency attachment points corresponding to the same sector of the same base station, some or all time setting synchronization operations may be skipped. In some embodiments, closed-loop power control associated with the wireless terminal's transmit power level is also performed.
[0137] Then, in step 1924, the wireless terminal initiates the transmission of user data to the base station. For example, the wireless terminal may have been previously assigned to the active user ID of the base station, for example, in step 1920, the base station scheduler could be assigned to one or more uplink talk channel segments to the wireless terminal, and the wireless terminal transmits user data using assigned uplink talk channel segments.
[0138] Returning to step 1926, in step 1926, the wireless terminal initiates registration and / or access operations, and then in step 1928, the wireless terminal performs control of the closed loop time settings based on feedback signals from the base station. The operation runs from stage 1928 to stage 1930. In stage
-761930, the wireless terminal initiates the transmission of user data to the base station.
[0139] When describing them in the context of an OFDM system, many methods and devices of the present invention are applicable to a wide range of communication systems, including many systems without OFDM and / or cell-free systems.
[0140] In various embodiments, the nodes described herein are implemented using one or more modules to perform the steps corresponding to one or more methods of the present invention, for example, switching between two base station operating modes, operating in an active mode base station operation, operation in standby mode for transmitting the base station, determining the base station operating mode, signaling to cause the mode transition, processing of the signaling associated with the mode transition, deciding whether to implement the mode transition or not, etc. In some embodiments, various features of the present invention are implemented using modules. Such modules can be implemented using software, hardware or a combination of software and hardware. Many of the methods or method steps described above can be implemented using machine executable instructions, such as software, contained in a machine readable medium, such as a memory device, for example, RAM, diskette, etc. to control a machine, for example, a computer general purpose with or without additional equipment to implement all or part of the methods described above, for example, in one or more nodes. In this regard, among other things, the present invention is directed to a machine readable medium including instructions executable by the machine to cause the machine,
In various CDMAs, for example, the processor and the assigned equipment will perform one or more steps of the method (s) described above.
[0141] The numerous additional variations of the methods and devices of the present invention described above will be apparent to those skilled in the art from the point of view of the above description of the invention. Such variations are to be recognized within the scope of the invention. The methods and devices of the present invention can be, and embodiments are, used in orthogonal frequency division multiplexing, and / or various other types of communication techniques that can be used to provide wireless communication links between access nodes and mobile nodes. In some embodiments, access nodes are implemented as base stations that establish communication links with mobile nodes using OFDM and / or CDMA. In various embodiments, mobile nodes are implemented as portable computers, personal digital assistants (PDAs) - (Personal Digital Assistants portable devices comprising a receiver / transmitter and logic circuits and / or procedures to implement the methods of the present invention.
or other circuits
40 members in 18 offices
Priority claims8
| Document | Office | Kind | Date |
|---|---|---|---|
| 22984605 | United States of America | A | |
| 22984605 | United States of America | A | |
| 06803642 | European Patent Office (EPO) | A | |
| 2006035931 | United States of America | W | |
| 2006035931 | United States of America | W | |
| EP20060803642 | – | – | – |
| US20050229846 | – | – | – |
| WO2006US35931 | – | – | – |
Members40
| Document | Office | Kind | |
|---|---|---|---|
| US2007066329A1 | United States of America | A1 | |
| CA2623060A1 | Canada | A1 | |
| WO2007035447A2 | World Intellectual Property Organization (WIPO) | A2 | |
| TW200726278A | Taiwan Province of China | A | |
| AR055173A1 | Argentina | A1 | |
| KR20080048084A | Republic of Korea | A | |
| EP1949564A2 | European Patent Office (EPO) | A2 | |
| JP2009510835A | Japan | A | |
| WO2007035447A3 | World Intellectual Property Organization (WIPO) | A3 | |
| CN101496309A | China | A | |
| RU2008115475A | Russian Federation | A | |
| EP1949564B1 | European Patent Office (EPO) | B1 | |
| ATE456202T1 | Austria | T1 | |
| DE602006011940D1 | Germany | D1 | |
| KR100947790B1 | Republic of Korea | B1 | |
| ES2339976T3 | Spain | T3 | |
| RU2390939C2 | Russian Federation | C2 | |
| PL1949564T3This record | Poland | T3 | |
| US7756548B2 | United States of America | B2 | |
| MY142192A | Malaysia | A | |
| SG165398A1 | Singapore | A1 | |
| US2011085611A1 | United States of America | A1 | |
| BRPI0616315A2 | Brazil | A2 | |
| JP2012054971A | Japan | A | |
| CA2623060C | Canada | C | |
| US8340703B2 | United States of America | B2 | |
| TWI387385B | Taiwan Province of China | B | |
| TW201330678A | Taiwan Province of China | A | |
| JP2014195293A | Japan | A | |
| TWI496498B | Taiwan Province of China | B | |
| JP5762914B2 | Japan | B2 | |
| JP5813824B2 | Japan | B2 | |
| CN105530690A | China | A | |
| CN101496309B | China | B | |
| CN106160839A | China | A | |
| HK1218362A1 | Hong Kong, China | A1 | |
| HK1226560A1 | Hong Kong, China | A1 | |
| CN105530690B | China | B | |
| BRPI0616315B1 | Brazil | B1 | |
| CN106160839B | China | B |
Numbers
- Publication, DOCDB
- 1949564
- Publication, EPODOC
- PL1949564T
- Application
- 803642
- Application, DOCDB
- 06803642
- Application, EPODOC
- PL20060803642T
Titles2
- English
- METHODS AND APPARATUS FOR USE IN A WIRELESS COMMUNICATIONS SYSTEM THAT USES A MULTI-MODE BASE STATION
- Polish
- Sposoby i urządzenie do zastosowania w systemie komunikacji bezprzewodowej, który wykorzystuje stację bazową pracującą w wielu trybach
Classification
- CPC, 11
- H04W52/0206
- H04W56/00
- H04B7/155
- H04B7/2678
- H04L5/0007
- H04L5/0048
- H04L5/0053
- H04W72/20
- Y02D30/70
- H04B7/15
- H04B15/00
- IPC, 1
- H04B7 26