Transmission power control method and apparatus for mobile communication system
Abstract
A method and apparatus for controlling the power of a signal transmitted between a base station and a mobile terminal which constitute a mobile communication system. At least one of the base station and the mobile terminal has functions to compare a predetermined reference value and a necessary transmission power obtained as a result of transmission power control in order to compensate for a signal intensity fluctuation occurring on a link between the base station and the mobile terminal, temporarily stopping the transmission if the necessary transmission power is larger than a predetermined permissible value, and transmit the signal if the necessary transmission power is equal to or smaller than the predetermined permissible value.

Term
No projected expiry on record.
- Priority
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- Granted
- Today
20 claims: 7 independent, 13 dependent
- 1CLAIMS PATENTKRAV 1. En sändeffektstyrmetod för att styra signalstyrkan hos en signal som sänds mellan en basstation och en mobil terminal, vilka utgör ett mobilt kommunikationssystem och som i nämnda mobila terminal omfattar stegen:1st A transmit power control method for controlling the signal strength of a signal transmitted between a base station and a mobile terminal, which constitutes a mobile communication system and which comprises said steps in said mobile terminal: - detektera en signalvariation, som uppträder på en nerlänk, på vilken en signal överförs från nämnda basstation till nämnda mobila terminal, alstra sändeffektstyrinformation för att kompensera för en signalvariation, som inträffar på en upplänk utgående från nämnda detekterade signalvariation, kompensera med hjälp av nämnda alstrade sändeffektstyrinformation signalstyrkan hos en signal, som sänds på nämnda upplänk från nämnda mobila terminal till nämnda basstation och detecting a signal variation occurring on a downlink, on which a signal is transmitted from said base station to said mobile terminal, generating transmit power control information to compensate for a signal variation occurring on an uplink based on said detected signal variation, compensating by said generated transmit power control information signal strength of a signal transmitted on said uplink from said mobile terminal to said base station and - sända från nämnda mobila terminal till nämnda basstation nämnda sändeffektstyrinformation, som har använts för att kompensera nämnda sändeffekt. transmitting from said mobile terminal to said base station said transmit power control information which has been used to compensate said transmit power.
- 5En sändeffektstyrmetod för att styra signalstyrkan hos en signal, som sänds från en basstation och en mobil terminal, som utgör ett mobilt 5th A transmit power control method for controlling the signal strength of a signal transmitted from a base station and a mobile terminal constituting a mobile 20 communication system, comprising at least in either of said base station and said mobile terminal steps:20 kommunikationssystem, och som omfattar åtminstone i endera av nämnda basstation och nämnda mobila terminal stegen: - styra sändeffekten för att kompensera för en ändring i signalstyrkan, som uppträder på en signallänk mellan nämnda basstation och nämnda mobila terminal, controlling the transmit power to compensate for a change in signal strength occurring on a signal link between said base station and said mobile terminal, 25 temporarily stopping the transmission if the necessary transmit power as a result of said transmit power control is greater than a predetermined reference value, and 25 - temporärt stoppa sändningen om nödvändig sändeffekt som ett resultat av nämnda sändeffektstyrning är större än ett förutbestämt referensvärde, och - sända nämnda signal om nämnda nödvändiga sändeffekt är lika med eller mindre än nämnda referensvärde. transmitting said signal if said necessary transmit power is equal to or less than said reference value. 30 30
- 9En apparat för sändeffektstyrning för att styra signalstyrkan hos en signal 9th An apparatus for transmitting power control to control the signal strength of a signal 15 transmitted between a base station and a mobile terminal constituting a mobile communication system and comprising;15 som sänds mellan en basstation och en mobil terminal vilka utgör ett mobilt kommunikationssystem och som omfattar;- alstringsanordning för sändeffektstyrinformation för upplänken för att detektera en signalvariation som uppträder på en nerlänk från nämnda basstation till nämnda mobila terminal och alstra sändeffektstyrinformation för - uplink transmit power control information generating device for detecting a signal variation occurring on a downlink from said base station to said mobile terminal and generating transmit power control information for 20 to compensate for a signal variation occurring on an uplink based on said detected signal variation;20 att kompensera för en signalvariation, som uppträder på en upplänk utgående från nämnda detekterade signalvariation, - inställningsanordningar för sändeffekt för upplänk för att kompensera med sändeffekten den signal som skall sändas på nämnda upplänk från nämnda mobila terminal till nämnda basstation utgående från nämnda alstrade - uplink transmit power setting devices to compensate with the transmit power the signal to be transmitted on said uplink from said mobile terminal to said base station from said generated 25 transmit power control information and 25 sändeffektstyrinformation och - sändanordningar för sändeffektstyrinformation för att sända nämnda sändeffektstyrinformation som används för kompensering med nämnda sändeffekt från nämnda mobila terminal till nämnda basstation och där alla nämnda anordningar ingår i nämnda mobila terminal. transmit power transmit control information means for transmitting said transmit power control information used to compensate with said transmit power from said mobile terminal to said base station and wherein all said devices are included in said mobile terminal.
- 15En apparat för sändeffektstyrning för att styra signalstyrkan hos en signal som sänds mellan en basstation och en mobil terminal vilka utgör ett mobilt kommunikationssystem omfattande:15th An apparatus for transmit power control for controlling the signal strength of a signal transmitted between a base station and a mobile terminal which constitutes a mobile communication system comprising: 10 comparison means for comparing a predetermined reference value and necessary transmit power obtained as a result of the transmit power control to compensate for a signal strength variation occurring on a link between said base station and said mobile terminal, and 10 - jämförelseanordningar för att jämföra ett förutbestämt referensvärde och nödvändig sändeffekt, som erhållits som ett resultat av sändeffektstyrningen för att kompensera för en signalstyrkevariation, som uppträder på en länk mellan nämnda basstation och nämnda mobila terminal, och - anordningar för att temporärt stoppa sändningen om nödvändig sändeffekt - means for temporarily stopping the transmission if necessary transmit power 15 is greater than said reference value as a result of said comparison, and wherein all devices are included in at least one of said base station and said mobile terminal. 15 är större än nämnda referensvärde som ett resultat av nämnda jämförelse, och där alla anordningar ingår i åtminstone endera av nämnda basstation och nämnda mobila terminal.
- 16Ett datoravläsningsbart inspeiningsmedium, i vilket finns lagrat ett program 16th A computer-readable recording medium in which a program is stored 20 for introducing transmit power control to control the signal strength of a pilot signal transmitted between a base station and a mobile terminal, which constitutes a mobile communication system, wherein said recording medium is present in at least one of said base station and said mobile terminal, and wherein said program comprises 20 för att införa sändeffektstyrning för att styra signalstyrkan hos en pilotsignal, som sänds mellan en basstation och en mobil terminal, vilka utgör ett mobilt kommunikationssystem, där nämnda inspeiningsmedium finns i åtminstone endera av nämnda basstation och nämnda mobila terminal och där nämnda program omfattar 25 - programs for performing transmit power control for a signal transmission to compensate for a signal strength variation occurring on a link between said base station and said mobile terminal, 25 - program för att utföra sändeffektstyrning för en signalöverföring för att kompensera för en signalstyrkevariation, som uppträder på en länk mellan nämnda basstation och nämnda mobila terminal, - program för att temporärt stoppa sändning om nödvändig sändeffekt för signalöverföringen är större än ett förutbestämt referensvärde som ett - program to temporarily stop transmission if the necessary transmit power for signal transmission is greater than a predetermined reference value such as a 30 results of said transmit power control as well 30 resultat av nämnda sändeffektstyrning samt - program för att sända om nämnda nödvändiga sändeffekt är lika med eller mindre än nämnda referensvärde. - programs for transmitting if said necessary transmit power is equal to or less than said reference value. 52 1 599 :;.V7 ::/. 52 1 599 : ;.V7 ::/. Ή : : · · ' Ή: · · '
- 1717 A mobile terminal for communicating with a base station provided with an antenna for receiving signals from said and for transmitting signals to said base station and with a DSP for determining whether or not data is transmitted based on conditions in a connection between said mobile terminal and said base station, wherein if said DSP makes the assessment not to transmit said data a transmission of said data is temporarily prevented. 17 En mobil terminal för kommunicering med en basstation försedd med en antenn för mottagning av signaler från nämnda och för utsändning av signaler till nämnda basstation och med en DSP för att bedöma om data skall överföras eller inte vilka är baserade på förhållanden i en förbindelse mellan nämnda mobila terminal och nämnda basstation, varvid om nämnda DSP gör bedömningen att ej överföra nämnda data ett sändande av nämnda data temporärt förhindras.
- 1919 A mobile terminal according to the claim, wherein the transmission contains a signal with an antenna unit of a received signal. 19 En mobil terminal enligt patentkravet, där överföringen innehåller en signal med en antennenhet av en mottagen signal.
Independent claims7
187 paragraphs in 1 section, as filed
(54) NAME Transmission power control method and apparatus for mobile communication system (56) PUBLISHING QUOTES:
EP 548 939 (H04B 7/005), US 5 333 175 (H04M 11/00) (57} SUMMARY · A method and apparatus for controlling the signal strength of a signal transmitted between a base station and a mobile terminal, which constitute a mobile communication system. At least one of the base station and the mobile terminal has functions for comparing a predetermined reference value and the necessary transmit power obtained as a result of the transmit power control to compensate for signal strength variations occurring on the link between the base station and the mobile terminal. and temporarily stopping the transmission if the required transmit power is greater than a predetermined allowable value and transmitting the necessary transmit power signal is equal to or less than the predetermined allowable value.
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521 599
SUMMARY OF THE PATENT APPLICATION
A method and apparatus for controlling the signal strength of a signal transmitted between a base station and a mobile terminal constituting a mobile communication system.
At least one of the base station and the mobile terminal has functions for comparing a predetermined reference value and the necessary transmit power obtained as a result of the transmit power control to compensate for signal strength variations occurring on the link between the base station and the mobile terminal. and temporarily stopping the transmission if the required transmit power is greater than a predetermined allowable value and transmitting the necessary transmit power signal is equal to or less than the predetermined allowable value.
521 599
Background of the Invention
The present invention relates generally to a transmit power control method and an apparatus for a mobile communication system controlling the transmit power between the base station and a mobile terminal of a mobile communication system and in particular to the most suitable technology for use in the transmit power control method and the apparatus for a mobile communication system where the transmit power is controlled in accordance with changes in signals received between the base station and the mobile terminal of the mobile the communication system based on systems with TDD-SS (Time split duplex with spread spectrum) and FDD (Frequency divided duplex).
There is a conventional mobile communication system for transmitting and receiving data by radio between base stations and mobile terminals. This mobile communication system utilizes different carrier frequencies for the uplink on which the signals are transmitted from a mobile terminal to the base station and for the downlink on which the signals are transmitted from the base station to the mobile terminal by FDD.
The signal transmitted and received between the base station and the mobile terminal in this mobile communication system is attenuated on the path between the base station and the mobile terminal and by the obstacles that exist between them and vary in signal strength due to interference between the direct wave and the reflected wave and similar phenomenon.
In order to compensate for the variations in the signal strength of the signal transmitted and received between the base station and the mobile terminal and which is dependent on the carrier frequency, the transmit power in the mobile FDD communication system is controlled by closed loop control. E.g.
521 599, the IS-95 specifications provide control of the transmit power in the uplink of the FDD system by controlling the transmit power in the terminal. The technique for controlling the downlink is described in U.S. Patent No. 5,559,790 entitled
Distributed spectrum communication system and associated transmission power control method, invented by Yano et al. and assigned to the inventor for the present patent and issued September 24, 1996. In addition, there is another information on uplink control technology proposed in a related U.S. patent application Serial No. 08/690819 entitled Mobile CDMA Communication System and Communication Method by these Inventors and assigned to the inventor of the present invention and registered on August 1, 1996. The interpretation of the above-mentioned United States application and the subsequent patent application in the United States, serial number 08/678656, registered July 11, 1996, are included in the interpretation of this application as references.
Regardless of whether the mobile communication system is CDMA-FDD or CDMA-TDD type, the following problems arise when controlling the transmit power on the transmission distance between the mobile terminal and the base station. In other words, when the attenuation of the data signal on the transmission distance between the base station and a certain mobile terminal increases temporarily, the base station transmits signals with much higher power in accordance with the function of the power control and this interferes with other mobile terminals. Moreover, when the transmit power from a mobile terminal is greatly increased, it can also block or disturb other base stations.
In the mobile FDD communication system, since closed-loop control can still occur and in which the transmission power in the uplink is controlled by the mobile terminal in accordance with the uplink power control information obtained at the base station, while the downlink is controlled by the base station in accordance with the power control information for the downlink, which is obtained at the mobile terminal, you get a problem because it takes a long time to change the transmit power.
521 599
Summary of the Invention
It is an object of the invention to provide a method and apparatus for controlling the transmit power in the mobile communication system with which the transmit power can be prevented from being wasted and from interfering with other stations.
Another object of the invention is to provide a method and apparatus for controlling the transmit power of the mobile communication system which can rapidly compensate for the signal variations occurring on the uplink and the size of which is reported from the mobile terminal to the base station.
Still another object of the invention is to provide a method and apparatus for controlling the transmit power of the mobile communication system which can rapidly compensate for signal variations caused on the downlink, which exist between the base station and the mobile terminal.
According to the present invention, there is provided a method and apparatus for controlling the strength of a signal transmitted between a base station and a mobile terminal, comprising: Devices for detecting a signal variation occurring on the downlink or uplink, means for generating transmit power control information to compensate for the signal variations occurring on the uplink or downlink from the detected signal variation, means for compensating for the strength of the transmitted signal on the up or down link from the information; and means for comparing the transmit power control information and a predetermined allowable compensation value; temporarily stopping the transmission if the transmit power control information is greater than a predetermined allowable compensation value as a result of the comparison, and adjusting the transmit power if the transmit power control information is equal to or less than the predetermined allowable compensation value and where all of the above devices are located in the base station or mobile station. The principle described above is useful especially when a signal in the form of data packets should
521 599 is transmitted between the base station and the mobile terminal. According to this principle, unlike the total transmission, the transmission is temporarily stopped when the transmitted power demand for the packet exceeds a predetermined value and when it becomes so high that it interferes with other base stations or mobile terminals in a mobile communication system, and the transmission resumes after a certain period of time. this way the communications are not disturbed at all as confirmed by tests performed by the inventors.
In order to fulfill the above-mentioned objects, the following typical features are proposed for the invention.
(1) A method of controlling the transmit power to control the signal strength of a signal transmitted between the base station and the mobile terminal constituting a mobile communication system, wherein the method comprises the steps of detecting a signal variation occurring on the downlink having the function of transmitting a signal from the base station to the mobile terminal, generate transmit power control information to compensate for signal variations on an uplink based on the detected signal variations, compensate with the transmit power variations of the signal transmitted on the uplink from the mobile terminal from the generated transmit power control information, and transmit the transmit power control information used to transmit the signal , for which the signal strength has been compensated, from the mobile terminal to the base station.
In the transmitting power control method of the mobile communication system, the mobile terminal which is connected to the base station receives a signal transmitted on a downlink from the base station to the mobile terminal, e.g. a pilot signal transmitted on a pilot channel.
When the mobile terminal detects a signal variation, e.g. attenuation that occurs on the downlink due to fading, distance or a barrier on the transmission route.
521 599
The mobile terminal assumes that the downlink detected signal variation also occurs in the uplink, on which a signal is transmitted from the mobile terminal to the base station, and generates control information for the transmit power to compensate for the signal variations occurring on the uplink.
The mobile terminal then changes the transmit power of the signal to be transmitted on the uplink from the mobile terminal to the base station based on the generated transmit power control information.
In addition, the mobile terminal also transmits the transmit power control information used to compensate for the signal variations, from the mobile terminal to the base station.
According to the transmission power control method of the mobile communication system, it is possible, since the mobile terminal compensates for the signal variations that occur on the uplink upon transmission from the mobile terminal to the base station, by sensing the signal variations that occur on the downlink upon transmission from the base station to the mobile terminal. , to quickly compensate for the signal variations that occur on the uplink upon transmission from the mobile terminal to the base station.
(2) A transmitting power control method for the mobile communication system according to paragraph (1), wherein the base station communicating with the mobile terminal has functions for receiving transmit power control information transmitted from the mobile terminal to the base station, detecting a signal variation which occurs on the uplink for transmission from the mobile terminal to the base station, generates transmit power control information to compensate for the signal variations that occur on the downlink; based on the detected signal variations and the transmit power control information transmitted from the mobile terminal and compensate the signal strength of the signal to be transmitted on the downlink from the base station to the mobile terminal, based on the transmit power control information generated.
521 599
The base station receives a signal transmitted on the uplink from the mobile terminal to the base station, e.g. a signal in the form of reservation packets and data packets, which are transmitted on a reservation channel and a transmission channel.
The base station detects signal variations occurring on the uplink for transmission from the mobile terminal to the base station and generates transmit power control information to compensate for the signal variations occurring in the downlink based on the detected fluctuations and transmit power control information transmitted from the mobile terminal.
The base station modifies the transmit power of the signal transmitted on the downlink from the base station to the mobile terminal based on the generated transmit power control information.
According to the transmission power control method for the mobile communication system, it is possible, since the base station detects signal variations that occur in the uplink for transmission from the mobile terminal to the base station, and compensates for the signal variations that occur on the downlink for transmission from the base station to the mobile terminal. quickly compensate for signal variations that occur on the downlink for transmission from the base station to the mobile terminal.
(3) a transmission power control method for the mobile communication system according to paragraph (1) or (2), further comprising the steps of comparing the transmitted power control information generated with a maximum allowable change or compensation value; temporarily stop transmission if the transmit power control information generated is greater than the maximum allowable compensation value and compensate for the signal variations if the transmit power control information generated is equal to or less than the maximum allowable compensation value.
In more detail, the base station or mobile terminal compares it
521 599 generated associated transmit power control information and the maximum allowable compensation value for the base station or mobile terminal, temporarily stops transmission if the generated transmit power control information is greater than the maximum allowable compensation value until the next time slot arrives.
If the transmit power control information generated is equal to or less than the maximum allowable compensation value, the signal variations are compensated based on the transmit power control information generated.
According to the transmission power control method of the mobile communication system, unnecessary transmission of transmit power can be avoided, since the transmission is temporarily stopped if the generated transmit power control information is greater than the maximum allowable compensation value and resume when the transmit power control information becomes equal to or less than the maximum permissible comp.
Brief description of the figures
Fig. 1 is a block diagram of a mobile communication system according to an embodiment of the invention.
Fig. 2 is a block diagram of a base station 100 for the mobile communication system of this first embodiment.
Fig. 3 is a block diagram of a mobile terminal 110 of the mobile communication system according to this first embodiment.
Fig. 4 is a timing diagram showing briefly data transmission in the mobile communication system according to this first embodiment.
Fig. 5 is a flow chart showing the transmission power control routines of the base station 100 of the mobile communication system of this first embodiment.
Fig. 6 is a flow chart showing the transmission power control routines of the mobile terminal 110 of the mobile communication system of this first embodiment.
Fig. 7 is a block diagram of a mobile communication system according to one
521 599 other embodiments of the invention.
Fig. 8 is a flow chart showing the transmission power control routines of a base station 700 in a mobile communication system according to the above-mentioned second embodiment.
Fig. 9 is a flow chart showing the transmission power control routines of a mobile terminal 710 in a mobile communication system according to the above-mentioned second embodiment.
Other objects and features of the invention will become apparent upon reading the description of the following embodiments, made with reference to the accompanying figures.
Description of proposals for designs
An embodiment of the transmit power control method and apparatus according to the invention will now be described, wherein the invention is utilized in a mobile communication system and controls the transmit power when communication occurs between a base station and a mobile terminal by means of TDD-SS systems.
Fig. 1 is a block diagram showing the basic features of the mobile communication system design of this embodiment. According to Fig. 1, the mobile communication system of this invention has a base station 100 which includes a downlink transmit power control 101, a downlink transmit power control information comparator 102, a downlink transmit power control information generator 103, and a transmit power control information receiver 104, a mobile terminal 110. , which includes an uplink transmit power 111, a uplink transmitter 112 comparator 112, an uplink transmitter power control information generator 113 and a transmit power control information transmitter 114, the communication channels 120 comprising an uplink 121, a downlink 122, blocked time slots 123, and a carrier frequency 124.
The base station 100 and the mobile terminal 110 are in communication with each other
521 599 by the uplink 121, on which a signal is transmitted from the mobile terminal 110 to the base station 100, and by the downlink 122, on which a signal is transmitted from the base station 100 to the mobile terminal 110. The communication channels 120 on the carrier frequency 124 are allocated in a time-divided manner to the uplink 121 and downlink 122 and between link allocation times there are locked time slots 123 to prevent interference.
Downlink transmit power 101 in base station 100 responds to the output of comparator 102 of downlink transmit power control information and provides a transmit power transmitted on downlink 122 from base station 100.
The downlink transmit power control information comparator 102 of the base station 100 compares whether the downlink transmit power control information generated by the downlink transmitter 103 power output information is greater than the maximum allowable base station 100 compensation value.
The downlink transmit power control information generator 103 generates downlink transmit power information 122 by utilizing the uplink 121 signal information and the downlink transmit power control information transmitted from the mobile terminal 110.
Since the signal received by base station 100 on uplink 121 has been compensated by mobile terminal 110, the downlink generator 103 of transmit power control information in base station 100 calculates the value of the signal on uplink 121 before compensating using the transmit power control information transmitted from the terminal 110 and generates transmit power 122nd
The transmit power control information receiver 104 of the base station 100 receives the transmit power control information transmitted from the mobile terminal 110.
The uplink transmit power 111 in the mobile terminal 110 determines
521 599 transmit power that mobile terminal 110 is to transmit on uplink 121 in accordance with the result of comparator 112 of uplink transmit power control information.
The uplink transmit power control information comparator 112 of mobile terminal 110 compares whether the uplink control uplink 121 generated by uplink transmit power control information generator 113 is greater than a maximum allowable compensation value in mobile terminal 110.
Generator 113 of transmit power control information for the uplink in the mobile terminal
110 generates transmit power control information for uplink 121 using the signal information on downlink 122.
The transmit power control information transmitter 114 in the mobile terminal 110 transmits the transmit power control information for the uplink 121 as determined by the adjuster
111 for uplink transmit power, to base station 100.
Fig. 2 is a block diagram showing the basic features of the base station 100's construction in the mobile communication system of this embodiment. The base station 100 comprises a CPU 201, a memory 202, a display unit 203, In / Out unit 204, the digital signal processor (DSP) 205, a mobile communication switch interface 206, an antenna 210, a pilot channel modulator 211, a response channel modulator 212, a transmit channel modulator. 213, reservation channel adaptation filter 214-215, transmit channel adaptation filter 216-217, a parabrus code generator (Pn code generator) 218, summers 220 and 221, multipliers 230 and 231 and a TDD switch 240.
In the base station 100, a bus interconnects the CPU 201, as the control function of the entire base station 100, with the memory 202, which stores control programs to control the function of the entire base station 100, the display unit 203, which presents the operating state of the base station 100, the I / O unit 204. , which provides command to base station 100 about the In / Out management, DSP-n 205, which controls
521 599 the routine for communicating with the mobile terminal 110 and the interface unit 206 for the mobile communication exchange.
The base station 100 communicates with the mobile terminal 110 by TDDSS. Between the base station 100 and the mobile terminal 110 there is a pilot channel, a reservation channel, a response channel and a transmit channel at the same carrier frequency (See Fig. 4).
DSP 205 in base station 100 comprises downlink transmit power control 101, downlink transmit power control information comparator 102, downlink transmit power control information generator 103, and transmit power control information receiver 104 described above.
DSP 205 is also connected to the pilot channel modulator 211, the response channel modulator 212, the transmission channel modulator 213, the reserve channel adaptation filter 214-215, the transmission channel adaptation filter 216-217, the PN code generator 218 and the TDD switch 240.
The pilot channel modulator 211 in the base station 100 modulates the pilot channel to transmit the pilot signal and feeds the modulated pilot signal via buzzer 220, multiplier 230, and TDD switch to antenna 210 from which it is transmitted to mobile terminal 110.
The response channel modulator 212 modulates the response channel through which a response or response to the backup packet received from the mobile terminal 110 is transmitted. The modulated response to the reservation packet is supplied via summers 220 and 221, the multiplier 230 and TDD switch 240 to the antenna 210 from which it is transmitted to the mobile terminal 110.
The transmission channel modulator 213 modulates a plurality of transmission channels on which data packets are transmitted. The modulated data packets are supplied via summers 220 and 221, multiplier 230 and TDD switch 240 to antenna 210 from which
521 599 it is transmitted to mobile terminal 110.
The reservation channel's matching filter 214-215 receives reservation packets sent from the mobile terminal 110 and the received reservation packets are processed by DSP 205.
The transmission channel's matching filter 216-217 receives data packets sent from the mobile terminal 110, and the received data packets are processed by DSP 205.
PN code generator 218 generates the PN code used in the respective pilot channel, reservation channel, response channel and transmission channel.
The TDD switch responds to a TDD synchronization signal generated by DSP 205 to temporarily engage the uplink and downlink or from transmission to reception and vice versa. When the base station 100 receives transmit power control information from the mobile terminal 110, the received transmit power control information is fed through the reservation channel matching filter 214215 and the transmission channel matching filter 216-217 to the transmit power control information receiver DSP 205.
The transmit power control signal determined by the downlink transmit power switch 101 in DSP 205 is applied to the pilot channel modulator 211, the response channel modulator 212 and the transmission channel modulator 213.
Fig. 3 shows a block diagram of the basic features of the construction of the mobile terminal 110 of the mobile communication system according to this embodiment. In Fig. 3, the mobile terminal 110 comprises a CPU 301, a memory 302, a display unit 303, an In / Out unit 304, DSP 305, an antenna 310, a reservation channel modulator 311, a transmit channel modulator 312, a pilot channel modulator 313, a response channel modulator 314. , a transmission channel modulator 315, a PN code generator 316, a controller 317 for
521 599 compensation of signal strength variations 317, an adder 320, the multipliers 330 and 331, and a TDD switch 340.
In the mobile terminal 110 shown in Fig. 3, the CPU 301, as the control function of the entire terminal, is in communication with the memory 302, which contains a control program, the presentation unit 303 presenting the operating position, the In / Out unit 304 performing the In / Out processing. of data to be transmitted or received, and DSP 305, which controls the function of communication with base station 100.
DSP 305 in mobile terminal 110 comprises uplink transmit power control 111, uplink transmitter power control information comparator 112, uplink transmitter power output control generator 113, and transmit power control information transmitter 114 described above.
DSP 305 is connected via a bus to the reservation channel modulator 311, the transmission channel modulator 312, the pilot channel modulator 313, the response channel modulator 315, the PN code generator 316, the transmit power control unit 317 for compensating signal variations and the TDD switch 340.
Reservation channel modulator 311 modulates the reservation channel, through which it sends a request for a transfer channel to the base station 100, which informs the base station that there are data packets to be transmitted over the transmission channel. The transmission channel modulator 312 modulates a plurality of transmission channels on which data packets are transmitted.
Reservation packets and data packets, which have been modulated by the respective reservation channel modulator 311 and transmission channel modulator 312, are supplied via the adder 320, the multiplier 330, the transmit power control unit 317 to compensate for signal strength variations, and the TDD switch to the antenna 310 from the data packet s
521 599
The pilot channel modulator 313 demodulates the pilot channel on which the pilot signal is transmitted. The signal strength and TDD synchronization of the received and demodulated pilot signal are applied to DSP 305.
The response channel modulator 314 demodulates the response channel on which the response packet is transmitted. The transmission channel modulator 315 demodulates a plurality of transmission channels on which data packets are transmitted.
The PN code generator 316 generates a plurality of PN codes used on the respective pilot channel, reservation channel, response channel and transmission channel.
The transmit power control unit 317 for compensating signal strength variations controls the transmit power based on the signal strength variation information generated by DSP 305.
TDD switch 340 responds to a TDD synchronization signal generated by DSP 305 to temporarily switch between uplink and downlink or change from transmission to reception or vice versa.
Fig. 4 is a timing diagram schematically showing the data transmission in the mobile communication system according to this embodiment. In Fig. 4, reference numbers 401-403 indicate reservation packets, 411-413 response packets, 421-423 data packets, and 431 and 432 pilot data.
As shown in Fig. 4, the data transmitted and received in the mobile communication system contains reservation packets 401-403, response packets 411-413, data packets 421-423 and pilot data 431 and 432.
When the reservation packet 401-403 is sent from the mobile terminal 110 to the base station 100, the base station sends the reply packets 411-413 to the mobile terminal 110 and then the mobile terminal sends packets 421-423 to the base station 100.
521 599
Backup packets 401-403, response packets 411-413, data packets 421-423 and pilot data 431 and 432, which are transmitted and received in the mobile communication system of this embodiment, have different appearance in the form of backup code, response code, Up / Down transfer code and pilot code and is transmitted on both uplink 121 and downlink 122 on the same carrier frequency 124.
The channels using the same carrier frequency 124 are separated as uplink 121 and downlink 122 by the time splitting. Before the mobile terminal 110 transmits data packets 421-423 to the base station, the reservation packets 401-403 on the uplink 121 are first sent from the mobile terminal 110 to the base station 100.
The base station 100, which has received the reservation packets 401-403, determines which transmission channel to be assigned to the mobile terminal 110, and then the response packets 411-413 on the downlink 122 are sent to the mobile terminal 110.
The mobile terminal 110 receiving the response packets 411-413 transmits the data packets 421-423 to the base station 100.
The pilot signal to be transmitted from base station 100 to mobile terminal 110 is transmitted only on downlink 122 as pilot data 431 and 432 are added.
Fig. 5 shows the routine of transmit power control processing in base station 100 of the mobile communication system of this embodiment.
As can be seen in Fig. 5, in base station 100 performs transmit power control by determining the transmit power on downlink 122 based on the transmit power control information transmitted from mobile terminal 110 and signal strength on uplink 121 and transmits these data to mobile terminal 110.
At base station 100, in step 501, a signal on the reservation channel or transmission channel is received from the matching filters 214-215 for
521 599 the reservation channel or adaptation filters 216-217 for the transfer channel.
In step 502, the base station 100 generator 103 derives transmit power control information for the downlink in the DSP 205 signal strength of the input signal on the reservation channel or transmit channel for each bit.
In step 503, base station 100 generates transmit power control information for downlink signal strength variations in uplink 121 using the transmit power information of the mobile terminal 110 received by transmit power information receiver 104 and the previously received signal strength for each bit on the reservation channel or transmission channel.
Since the signal on uplink 121 is already compensated by the mobile terminal 110, the received signal strength on the reservation channel or transmission channel on the uplink 121 is restored to previous signal strength before the mobile terminal 110 is compensated using the signal strength variations in the transmit power control information transmitted from the mobile terminal 110 , and then the signal strength variations on the uplink are estimated.
In step 504, the base station 100 generator 103 of downlink transmit power control information calculates the transmit power necessary to compensate for the signal strength variation estimated in step 503.
In step 505, base station comparator 102 compares the downlink transmit power information necessary to the transmit power calculated by generator 103 downlink transmit power information, and the maximum allowable transmit power compensation value which can be compensated in base station 100.
In step 505, the program goes to step 506 if the transmit power required to compensate for the signal strength variations estimated in step 503 is greater than the maximum allowable compensation value in base station 100 as a result of
521 599 the comparison between the necessary transmit power calculated by the generator 103 of transmit power control information for the downlink, and the maximum allowable compensation value for the base station 100.
In step 506, the base station waits for the next message location and then the program returns to step 502.
In step 505, the program proceeds to step 507 if the transmit power needed to compensate for the signal strength variations estimated in step 503 is equal to or lower than the maximum allowable compensation value for base station 100 as a result of the comparison of the required transmit power calculated by the generator 103 of transmit power control information for the downlink, and the maximum allowable compensation value for base station 100.
In step 507, the downlink transmitter 101 of the base station 100 locks the downlink transmit power 122 to the necessary transmit power calculated by the generator 103 downlink transmit power control information.
Fig. 6 shows the transmission power control routine in the mobile terminal 110 of the mobile communication system according to this embodiment.
As shown in Fig. 6, mobile terminal 110 performs the transmit power control and determines the transmit power on the uplink 121 upon receiving the pilot signal transmitted from the base station 100 and by transmitting to the base station 100 the transmit power control information used to control the transmit power.
In step 601 of mobile terminal 110, the pilot signal transmitted from base station 100 is received by pilot channel modulator 313 and supplied to DSP 305.
In step 602, the generator 113 of the mobile terminal 110 extracts transmit power control information for the uplink, the signal strength from the received pilot signal.
521 599
In step 603, the uplink generator 113 of transmit power control information for uplink integrates the recovered signal strength during the particular message space period in which the received pilot signal is transmitted or during the particular data packet period in which the data packet is transmitted.
In step 604, the mobile terminal 110's generator 113 calculates transmit power control information for the uplink attenuation of the pilot signal, which depends on the transmit distance or shadow attenuation of the pilot signal due to obstacles along the channel distance, from the integrated value over message period or data packet period.
In step 605, the mobile terminal 110's generator 113 calculates transmit power control information for the uplink compensation value, which is used to offset the attenuation calculated in step 604.
In step 606, the mobile terminal 110 generator 113 of transmit power control information for the uplink of the mobile terminal 110 estimates the signal strength variation present on the pilot signal based on the signal strength for each bit of the pilot signal extracted in step 602.
In step 607, the mobile terminal 110's generator 113 of transmit power control information for the uplink calculates the compensation value to compensate for the signal strength variation estimated in step 606.
In step 608, the mobile terminal 110 comparator 112 of uplink transmit power control information compares the transmit power needed to compensate for the signal strength variation calculated by the uplink transmitter power control information 113 and the maximum allowable maximum transmit power compensation value that can be compensated the mobile terminal 110.
If in step 608, transmit power needed to compensate for them
521 599 signal strength variations estimated at step 607 are greater than the maximum allowable compensation value for the mobile terminal 100 as a result of the comparison of the necessary transmit power calculated by the uplink transmitter 113 power output information and the maximum allowable compensation value for the mobile terminal 110. program over to step 609.
In step 609, the mobile terminal 110 waits for the next message location and then the program returns to step 602.
If in step 608, the transmit power needed to correct the signal strength variation estimated in step 607 is equal to or less than the maximum allowable compensation value of the mobile terminal 110 as a result of the comparison of the necessary transmit power calculated by the generator 113 of transmit power control information. uplink and maximum allowable compensation value for mobile terminal 110, the program proceeds to step 610.
In step 610, the uplink transmit power transmitter 111 selector 111 selects a transmit power level closest to the transmit power level calculated by generator 113 of the uplink transmit power control information from a number of previously set transmit power levels.
In step 611, the uplink transmitter power transmitter 111 sets 111 of the uplink transmit power in accordance with the compensating value to compensate for distance attenuation or shadow attenuation, which was calculated in step 605 and the transmit power level selected in step 610.
In step 612, the mobile terminal 110's generator 113 measures uplink transmit power control information from the integrated value obtained when the pilot signal was integrated over message location or
521 599 data packet period in step 603.
In step 613, the transmitter 114 of the mobile terminal 110 of the transmit power control information transmits the signal strength variation determined in step 611 and the ratio C / L obtained in step 612 as the transmit power control information to the base station 100.
Another embodiment of the mobile communication system utilizing FDD and in which the invention has been used will now be described with reference to Figures 7 to 9.
In Fig. 7, the mobile FDD communication system comprises a base station 700 having a downlink transmit power control information receiver, a downlink transmit power switch 702, an uplink transmit power control information generator 703, and an uplink transmit power control information transmitter 704 having a downlink transmit power control information transmitter 711, a downlink transmitter power output control information generator 712; an uplink transmit power switch 713 and an uplink transmit power control information receiver, an uplink 721, a downlink 722, a blocked frequency range 723, an uplink carrier frequency 724, and a downlink carrier frequency 725.
In this system, base station 700 and mobile terminal 710 communicate with each other via uplink 721 to transmit a signal from mobile terminal 710 to base station 700 and downlink 722 to transmit a signal from base station 700 to mobile terminal 710. Uplink 721 and downlink 722 utilizes different carrier frequencies, uplink frequency 724 and downlink frequency 725 with a blocked frequency band 723 between the channels to prevent interference.
When the base station 700 transmits a pilot signal on the downlink 722, the mobile terminal 710 receives the pilot signal and then the generator 712 measures the
521 599 transmit power control information for the downlink signal strength of the received pilot signal on the downlink so as to estimate the signal attenuation and signal strength variation conditions on the transmission distance. Then, the generator 712 generates transmit power control information for the downlink to be utilized in controlling the transmit power in the downlink 722.
The downlink transmitter 710 transmit power control information transmitter 711 transmits the downlink transmit power output control information generated through uplink 721 to the base station.
The base station 700 receiver 701 of the downlink transmit power control information receives the downlink transmit power control information transmitted from the mobile terminal 710 and feeds it to the downlink transmit power 702. The transmitter power transmitter 702 of the base station 700 determines the transmit power of the downlink 722 using the obtained transmit power control information for the downlink.
The base station 700 generator 70 of uplink transmit power control information measures when it receives the uplink 721 signal from the mobile terminal 710, the signal variations or the like of the uplink 721 signal, and generates uplink transmit power control information for utilization in the uplink transmit power control 721. The base station transmitter 704 for transmit power control information transmits the generated transmit power control information for uplink on downlink 722 to mobile terminal 710.
The receiver terminal 714 of the uplink transmit power control information receives the uplink transmit power control information transmitted from the base station 700 and feeds it to the uplink transmitter power 713. The uplink transmit power adjuster 713 determines the uplink transmit power 721 using the received uplink transmit power control information.
521 599
Fig. 8 shows the transmission power control routine no in the base station 700 of the mobile communication system.
As shown in Fig. 8, the base station performs transmit power control such that the transmit power on the downlink 722 is set according to the transmit power control information transmitted from the mobile terminal 710 and when the signal strength variations or the like on the uplink are measured, the transmit transmit power control information can be generated. mobile terminal 710.
In step 801, base station 700 receiver 701 of downlink transmit power control information receives the downlink transmit power control information transmitted from mobile terminal 710 via uplink 721.
In step 802, base station adjuster 702 calculates downlink transmit power required transmission power utilizing the downlink transmit power control information transmitted from mobile terminal 710. In step 802A, base station comparator 706 of downlink transmit power control information compares the transmit power needed to compensate for the necessary transmit power generated by downlink transmitter 705 transmit power control information and the maximum allowable base power compensation value that can be compensated .
If, at step 802A, the required transmit power calculated from the downlink transmit power control information is greater than the maximum allowable compensation value for the base station 700 as a result of the comparison, the program goes to step 802B to stop the transmission. After the transmission is stopped to the next message location or packet period, the program proceeds to step 804 where signal from the matching filter is received. On the other hand, if the estimated necessary transmit power is equal to or less than the maximum allowable compensation value for the base station 700, the program goes to step 803 where the transmit power is determined.
521 599
In step 803, the base station 700 sets downlink transmit power adjusters downlink transmit power utilizing calculated necessary transmit power.
In step 804, the base station 700 generator 703 of transmit power output control information receives the signal transmitted on the uplink 721 from the mobile terminal 710.
In step 805, the base station 700 generates transmit power control information for the uplink signal strength for each bit of the received signal on the uplink 721.
In step 806, base station 700 generators 703 transmit uplink control information for the uplink signal strength variations of the signal transmitted on uplink 721 from the mobile terminal, based on the signal strength variations obtained for each bit, and generate uplink transmit power control information.
In step 807, base station 700 transmits transmit power output control information for uplink transmit transmit power control information generated by generator uplink transmit power control information 703 through downlink 722 to mobile terminal 710.
Fig. 9 shows the transmission power control routine of the mobile terminal 710 of the mobile communication system according to this last mentioned embodiment.
As shown in Fig. 9, the mobile terminal 710 performs transmit power control such that the transmit power of the uplink 721 is set according to the transmit power control information transmitted from the base station 700, and when signal strength variations or the like on the downlink signal are measured, the transmit power control information is transmitted to base station 700.
In step 901, mobile terminal 710 receives the pilot signal transmitted on downlink 722 from base station 700. In step 710, mobile terminal 710's uplink transmitter 713 derives transmit power for uplink signal strength for each bit of the
521 599 received pilot signal.
In step 903, the transmitter power transmitter 713 of the mobile terminal 710 integrates the uplink signal strength for a certain time, e.g. a message location during which data is transmitted or a data packet period during which a data packet is transmitted.
In step 904, the mobile terminal 710's adjuster 713 calculates the uplink transmit power attenuation of the pilot signal, which is due to distance or shadow attenuation due to obstacles along the transmit distance, based on the integrated value during a message location or a data packet period.
In step 905, the receiver terminal 714 of the mobile terminal 710 extracts transmission power control information for the uplink, which depends on the distance or shading, from received transmit power control information for the uplink.
In step 906, the uplink transmitter 713 of the mobile terminal 710 calculates the uplink transmit power necessary for the signal to be transmitted on the uplink 721, based on the attenuation of the pilot signal due to distance or obstruction and calculated in step 904. information on the attenuation due to distance or shading obtained in step 905. In step 906A, the mobile terminal 710 comparator 716 of uplink transmit power control information, calculated by the uplink transmit power control information generator, compares with the maximum allowable compensation value for the maximum permissible transmit power which can be compensated for in the mobile terminal 710. If in step 906A, the transmit power calculated in step 906 and needed to compensate for the attenuation obtained in steps 904, 905 is greater than the maximum allowable compensation value for mobile terminal 710 when the necessary transmit power calculated by the uplink transmit power control information generator is compared to the maximum allowable compensation value for the mobile terminal 710, so the program goes to step
521 599
908, where signal strength variations are estimated.
If, at step 906A, the necessary transmit power calculated by the uplink transmit power control information is equal to or less than the maximum allowable compensation value for mobile terminal 710, the program goes to step 907, where the transmit power is determined.
In step 907, the mobile terminal 710's adjuster 713 determines the transmit power of the uplink 721.
In step 908, the mobile terminal 710's estimator 712 of downlink transmit power control information estimates the downlink signal strength variations based on the signal strength extracted for each bit of the pilot signal in step 902 and the attenuation or shadow attenuation calculated in step 904.
In step 909, the mobile terminal 710 generator 712 of transmit power control information for the downlink derives the C / L ratio (carrier / interference) from the integrated value obtained by integration over the message location or data packet period of the pilot signal in step 903.
In step 910, the mobile terminal 710 transmits downlink transmit power control information for the downlink, the signal strength variations estimated in step 908, and the ratio C / l obtained in step 909 as downlink transmit power control information 721.
According to the mobile communication system utilizing FDD and described above, the uplink transmit power control information obtained in the base station 700 is transmitted to the mobile terminal 710 for the mobile terminal 710 to control the transmit power on the uplink 721, and the transmit power control information for the downlink 722, received in the mobile terminal 710 is sent to the base station 700 for the base station to control the transmit power on the downlink 722.
521 599
The maximum allowable compensation value in the above comparison can be set dynamically and in accordance with the conditions of the transmission distance, e.g. the speed of the mobile terminal. Furthermore, the maximum allowable compensation value can be set depending on differences in data rates for transmitted data packets or the availability needed. Each of the above methods for transmit power control can be introduced as software-based functions in the form of programs associated with the control process.
Although the present invention has been described from the aforementioned embodiments, the invention is not limited to these embodiments without various modifications and exchanges may of course be made to the invention without being outside the scope of the invention.
521 599
10 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10
28 members in 6 offices
Priority claims4
| Document | Office | Kind | Date |
|---|---|---|---|
| 31623296 | Japan | A | |
| 31623296 | Japan | A | |
| 08316232 | – | – | – |
| JP19960316232 | – | – | – |
Members28
| Document | Office | Kind | |
|---|---|---|---|
| FI974336A0 | Finland | A0 | |
| SE9704345D0 | Sweden | D0 | |
| FI974336A | Finland | A | |
| SE9704345L | Sweden | L | |
| CN1185084A | China | A | |
| JPH10215219A | Japan | A | |
| KR19980042787A | Republic of Korea | A | |
| US6175744B1 | United States of America | B1 | |
| US2001000168A1 | United States of America | A1 | |
| JP2002290326A | Japan | A | |
| US6546260B2 | United States of America | B2 | |
| US2003130004A1 | United States of America | A1 | |
| SE521599C2This record | Sweden | C2 | |
| CN1136741C | China | C | |
| CN1510938A | China | A | |
| JP2005020770A | Japan | A | |
| KR100473252B1 | Republic of Korea | B1 | |
| JP3631601B2 | Japan | B2 | |
| JP3660911B2 | Japan | B2 | |
| FI116112B | Finland | B | |
| KR100496528B1 | Republic of Korea | B1 | |
| CN1242633C | China | C | |
| US7120457B2 | United States of America | B2 | |
| US2007032197A1 | United States of America | A1 | |
| JP3902775B2 | Japan | B2 | |
| US7421283B2 | United States of America | B2 | |
| US2009005106A1 | United States of America | A1 | |
| US2009005107A1 | United States of America | A1 |
1 legal event, as the office reported them to INPADOC
Events
| Event | Code | |
|---|---|---|
| Patent has lapsedLapsedNUG | NUG |
Numbers
- Publication, DOCDB
- 521599
- Publication, EPODOC
- SE521599
- Application
- 9704345
- Application, DOCDB
- 9704345
- Application, EPODOC
- SE19970004345
Titles2
- Swedish
- Sändeffektstyrmetod och apparat för mobilt kommunikationssystem
- English
- Transmission power control method and apparatus for mobile communication system
Classification
- CPC, 4
- H04W52/24
- H04W52/362
- H04W52/30
- H04W52/248
- IPC, 8
- C04B35 583
- C04B35 599
- C04B35 00
- C04B35 645
- C04B35 65
- H04B7 005
- H04B7 26
- H04W52 24