Random access method and radio communication terminal device
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- 1Zastrzeżenia patentowe 1. Sposób dostępu bezpośredniego obejmujący:etap duplikowania pakietu transmisji;etap przydzielania każdego z wielu zduplikowanych pakietów transmisji do kanału dostępu bezpośredniego;i etap transmisji wielu pakietów transmisji zgodnie z wynikiem przydziału w etapie przydzielania;przy czym, w etapie przydzielania, wiele zduplikowanych pakietów transmisji jest przydzielanych się do podnośnych w kanale dostępu bezpośredniego. 2. Sposób dostępu bezpośredniego według zastrz. 1, obejmujący także etap określania liczby duplikatów pakietu transmisji w etapie duplikowania na podstawie priorytetu usługi planowanej po rozpoczęciu komunikacji. 3. Sposób dostępu bezpośredniego według zastrz. 1, obejmujący także etap określania liczby duplikatów pakietu transmisji w etapie duplikowania, na podstawie liczby ponownych transmisji pakietu transmisji. 4. Sposób dostępu bezpośredniego według zastrz. 1, obejmujący także etap określania liczby duplikatów pakietu transmisji w etapie duplikowania, na podstawie liczby aparatów terminali komunikacji należących do tej samej komórki i używających kanał dostępu bezpośredniego. 5. Sposób dostępu bezpośredniego według zastrz. 1, przy czym w etapie przydzielania, wiele zduplikowanych pakietów transmisji jest także przydzielanych do jednej ze szczelin czasowych w kanale dostępu bezpośredniego. 6. Sposób dostępu bezpośredniego według zastrz. 1, przy czym w etapie przydzielania, wiele zduplikowanych pakietów transmisji jest także przydzielanych do jednej z anten w kanale dostępu bezpośredniego. 7. Sposób dostępu bezpośredniego według zastrz. 1, przy czym w etapie przydzielania, wiele zduplikowanych pakietów transmisji jest losowo przydzielanych do jednej ze szczelin czasowych w kanale dostępu bezpośredniego. 8. Aparat terminala komunikacji radiowej zawierający: sekcję duplikowania, która duplikuje pakiet transmisji;sekcję przydzielania, która przydziela każdy z wielu zduplikowanych pakietów transmisji do kanału dostępu bezpośredniego;i sekcję transmisji, która transmituje wiele pakietów transmisji zgodnie z wynikiem przydziału w etapie przydzielania;- 149. 10. przy czym sekcja przydzielania przydziela także wiele zduplikowanych pakietów transmisji do podnośnych w kanale dostępu bezpośredniego. Aparat terminala komunikacji radiowej według zastrz. 8, przy czym sekcja przydzielania przydziela wiele identycznych pakietów transmisji do jednej z wielu anten dla transmisji do kanału dostępu bezpośredniego. Aparat terminala komunikacji radiowej według zastrz. 8, przy czym sekcja przydzielania przydziela wiele identycznych pakietów transmisji do co najmniej dwóch kolejnych szczelin czasowych w kanale dostępu bezpośredniego. -15200-1 FIG.1 C\J O FIG.3 APARAT 200-1 TERMINALA KOMUNIKACJI RADIOWEJ FIG.4A -18- 19“5 UJ £ O □ g “3 O cx UJ H CM ό o CM £ £ < uft m CM 5— z z ΞΞ z: ω •co 'CO co 'CO o o o o o z z z Q α Q □ Q O o O O O CL CL CL Cl CL CQ o i 1 APARAT 200-3 TERMINALA KOMUNIKACJI RADIOWEJ FIG.4C -20-21- FIG.5A -22-23- CO un O u. Q LO o Lu Ld tn O -27ι±ι 210 ο < CC ο LL Z FIG.6 FIG.7 FIG.8 FIG.9 -31210 FIG.11 LO I— LU CZ o cz Q_ < FIG.12A -34αΐ Ν CL Ο Ζ) □ α C0 ±1 (Ζ Ο £ £ FIG.12B -35ODNOŚNIKI CYTOWANE W OPISIE Poniższa lista odnośników cytowanych przez zgłaszającego ma na celu wyłącznie pomoc dla czytającego i nie stanowi części dokumentu patentu europejskiego. Pomimo, że dołożono największej staranności przy jej tworzeniu, nie można wykluczyć błędów lub przeoczeń i EUP nie ponosi żadnej odpowiedzialności w tym względzie. Dokumenty patentowe cytowane w opisie •JP 2001268051 A [0004] • DE 19820684 A1 [0006] •WO 2004019630 A1 [0007] • US 20030174663 A1 [0009] • EP 0917317 A1 [0010] • EP 0993214 A1 [0011] Literatura niepatentowa cytowana w opisie • W-CDMA Mobile Communication Scheme. Maruzen Co., Ltd, 25 June 2001, 45 [0005]
120 paragraphs, as filed
Technical field [0001] The present invention relates to a direct access method in a radio communication system consisting of a plurality of apparatus of a radio communication terminal and base station apparatus, and a apparatus of a radio terminal of the direct access method.
[0002] Conventionally, in a radio communication system according to a cell diagram, when the radio terminal apparatus starts or resumes communication, the individual channel between the radio terminal apparatus and the base station apparatus is not yet set up and the radio terminal apparatus is therefore designed to attempt to access the base station apparatus using a direct access channel (henceforth RACH: direct access channel). For example, in the radio communication system according to the W-CDMA scheme, the ALOHA slotted scheme was adopted. When each of the many apparatus of the radio communication terminal starts or resumes communication, an attempt to access the base station apparatus is made at random time from the initial candidates for the time (RACH subchannel). If there is no response from the base station apparatus within a predetermined period of time from the access time, access is considered unsuccessful and another attempt is made to access the base station apparatus (see, for example, Non-Patent Document 1).
[0003] Further, in a radio communication system according to a multi-carrier transmission scheme, a technology is known in which, when the transmission packet is transmitted to the base station apparatus by RACH for setting up an individual channel, the apparatus of the radio terminal selects the slot (time) and subcarrier ( frequency) RACH and the spreading code based on certain conditions, scatters the transmission packet using the selected spreading code, and then transmits the packet to the base station apparatus at the selected time and frequency (see, for example, Patent Document 1). Also, in the technology disclosed in Patent Document 1, attempting to access the base station apparatus, and there is no response from the base station apparatus at a specified access time, the radio terminal apparatus attempts to access the base station apparatus again.
[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2001-268051.
[0005] Non-Patent Document 1: Keiji Tachikawa (ed.), "W-CDMA Mobile Communication Scheme", Maruzen Co., Ltd., page 45, 25 June 2001.
[0006] Document DE 198 20 684 A1 relates to a method of configuring a mobile station connection for a radio communication system. In the frequency channel, N narrowband subchannels are created for direct access. A mobile station requesting connection configuration selects more than one number of subchannels that form a carrier group. Then, the request symbol distributed on the carrier group is sent from the mobile station to the base station.
[0007] Document WO 2004/019630 A1 relates to a system and method for use in the mode of wireless packet data communication to facilitate communication between one or more remote devices and a base target device. The system provides a high priority access channel that can be used by explicitly allowed remote packet data units for implementation
-2 direct access requests to the channel when the standard communication channel is overloaded. It has been shown that when the user needs to contact the base station, the standard RACH channel is used to attempt to access. In the event that the network is not too busy, that the base station will conduct normal negotiations and communication.
[0008] If the standard RACH channel is too busy, it will be verified whether the user equipment is able to use the high priority RACH channel. If the user equipment is not considered capable of using such a high priority channel, a delay algorithm is initiated, after which another attempt is made to access the network again by using the standard RACH channel. However, if your equipment is able to work on a high priority RACH channel, it will attempt to connect to the base station on a priority RACH channel.
[0009] Document US 2003/0174663 A1 relates to a satellite communication system and provides an approach for performing a competitive pattern that supports differentiated quality of service levels. The system terminals have been shown to communicate according to the differentiated ALOHA protocol, in which the quality of service levels corresponds to the degree of differentiation.
[0010] Document EP 0 917 317 A1 relates to a method of resolving conflicts between remote hosts claiming bandwidth in wireless frequency division multiple access networks ί time with two-way alternating and simultaneous two-way transmission. A multi-access demand (ODMA) method with fair queuing (FQ) rule (called ODMAFO) for efficient use of the limited bandwidth available in wireless communication networks is provided. In this method, the high-intensity short-term transmission source sends the channel access packet to reserve the bandwidth for future transmissions whenever the packet arrived at an empty queue, while the constant transmission rate will only go through the rivalry once during connection setup. The rule of distributed fair queuing with self-clocking is used to determine the order of transmission of different uplink source locations, which allows differentiated QoS.
[0011] Document EP 0 993 214 A1 relates to a method and devices for transmitting and receiving data in a telecommunications multi-access code scale system. A direct access time window is provided that includes a plurality of direct access slots for transmitting direct access data, for example from a mobile station to a base station. Many direct access slots in the direct access time window are divided into at least two groups, with the groups being allocated to respective priority classes, where the priority classes represent the priorities of the direct access data transmission to the transmission in the direct access slots. The method allows limiting congestion in direct access slots for specific types of access at the expense of other types of access and more efficient use of the direct access time window.
The essence of the invention
Problems to be Solved by the Invention [0012] However, in the technologies disclosed in Patent Document 1 and Non-Patent 1, many radio terminal apparatus attempts to access the base station apparatus by RACH and an attempt to access the base station apparatus is repeated after determining successful or unsuccessful combination of individual channels so that a chance can occur, when setting up an individual channel after the first access to the base station apparatus may require
-3czasu. In addition, the number of transmission packets transmitted by RACH increases when the number of radio communication terminal apparatus belonging to the same cell increases so that the probability of collision of transmission packets becomes high and the setting up of individual channels requires a longer time. For this reason, with conventional technology, there is a greater likelihood of communication deterioration and a lack of access condition for communications and the like in a radio terminal apparatus designed for service planning requesting a QoS (service quality) delay requirement.
[0013] It is therefore an object of the invention to provide a direct access method for setting up an individual channel between a radio terminal apparatus and a base station apparatus in a short time, and a radio terminal apparatus for performing this direct access method.
Means for solving the problem [0014] The direct access method according to the invention includes a step of duplicating a transmission packet, a step of allocating each of a plurality of duplicate transmission packets to a direct access channel and a step of transmitting a plurality of transmission packets according to the allocation result in the allocation step, wherein in the allocation step a plurality of duplicate transmission packets are allocated to subcarriers in a direct access channel.
[0015] According to this method, the radio terminal apparatus assigns and transmits multiple transmission packets to the base station apparatus via RACH so that even if many radio terminal apparatus belongs to the same cell, there is a high probability that one of the many transmission packets is received by the base station apparatus without collision with transmission packets transmitted from other apparatus of the radio communication terminals. As a result, according to the method, the radio terminal apparatus transmits duplicate transmission packets to the RACH without waiting for a response from the base station apparatus to confirm whether or not the transmission packets transmitted on the RACH have been received in the base station apparatus, thus setting up an individual channel to the base station camera in a short time.
[0016] The direct access method according to the invention includes, in the above-mentioned invention, the step of determining the number of duplicates of the transmission packet in the duplication step based on the priority of the service planned after commencing communication.
[0017] According to this method, in addition to the effect of the invention, the number of transmission packets to be transmitted on the RACH by the apparatus of the radio communication terminal is limited according to the types of services planned after setting up the individual channel so that from many apparatus of the radio communication terminals belonging to the same cell, the most urgent is more likely to set up an individual channel. As a result, according to this method, problems of communication deterioration, inaccessibility of communication, and the like are less likely to occur in many of the apparatus of radio communication terminals belonging to the same cell.
[0018] The direct access method according to the invention comprises, in the above-mentioned invention, the step of determining the number of duplicate transmission packets in the duplication step based on the number of retransmissions of the transmission packet.
[0019] According to this method, in addition to the effect of the invention, the number of duplicate transmission packets increases based on the number of retransmissions of the transmission packet, so that from many radio terminal apparatus devices belonging to the same cell, the most urgent one is more likely to set up an individual channel. As a result, according to this method, problems of deterioration
Communications, inaccessibility, and the like are less likely to occur in many of the devices in a radio communication terminal belonging to the same cell. [0020] The direct access method according to the invention includes, in the above-mentioned invention, the step of determining the number of duplicate transmission packets in the duplication step based on the number of radio terminal apparatus belonging to the same cell and using the direct access channel.
[0021] According to this method, in addition to the effect of the invention, the number of radio terminal apparatus belonging to the same cell increases, the radio terminal apparatus creates fewer duplicate transmission packets so that the collision probability of transmission packets can be reduced. As a result, according to this method, problems of communication deterioration, inaccessibility of communication, and the like are less likely to occur in many of the apparatus of radio communication terminals belonging to the same cell.
[0022] In the direct access method according to the invention, in the allocation step of the above-mentioned invention, each of the plurality of duplicate transmission packets is allocated to one of the time slots in the direct access channel.
[0023] In the direct access method according to the invention, in the allocation step of the above-mentioned invention, each of the plurality of duplicate transmission packets is allocated to one of the subcarriers on the direct access channel.
[0024] According to these methods, in addition to the effect of the invention, the radio terminal apparatus randomly allocates multiple transmission packets to one of: RACH time slots and subcarriers, so that it is possible to reduce the signal processing load necessary for the allocation of transmission packets in the radio terminal apparatus.
[0025] In the direct access method according to the invention, in the allocation step of the above-mentioned invention, each of the plurality of duplicate transmission packets is allocated to one of the time slots and one of the subcarriers in the direct access channel.
[0026] According to this method, in addition to the effect of the invention, the radio terminal apparatus randomly allocates multiple transmission packets to RACH time slots and subcarriers, so that even if multiple radio terminal apparatus apparatus belongs to the same cell, the probability of collision of transmission packets can be reduced.
[0027] In the direct access method according to the invention, in the allocation step of the above-mentioned invention, each of the plurality of duplicate transmission packets is allocated to one of the spreading codes on the direct access channel.
[0028] According to this method, in addition to the effect of the invention, many radio terminal apparatus diffuses and transmits transmission packets to the base station apparatus using randomly selected spreading codes so that even if the radio terminal apparatus is known to belong to the same cell, it is possible to limit collision probability of transmission packets.
[0029] The radio terminal apparatus of the invention adopts a configuration with: a duplication section that duplicates a transmission packet; an allocation section that allocates each of the duplicate transmission packets to the direct access channel; and a transmission section that transmits multiple transmission packets according to the allocation result in the allocation section, the allocation section also allocating multiple duplicate transmission packets to subcarriers on the direct access channel.
[0030] According to this configuration, the radio terminal apparatus iosally assigns multiple duplicate transmission packets to the RACH and transmits transmission packets to the base station apparatus such that even when multiple apparatus of the radio communication terminal belongs to the same cell, a high probability is achieved, that many transmission packets will be received by the base station apparatus without interfering with transmission packets from other apparatus of the radio terminal. As a result, according to this configuration, the radio terminal apparatus transmits duplicate transmission packets to RACH without waiting for a response from the base station to confirm whether the transmission packets transmitted to RACH are received at the base station or not, thus setting up an individual channel to the apparatus base station in a short time.
Advantageous Effect of the Invention [0031] According to the invention, many radio terminal apparatus randomly allocates multiple duplicate transmission packets to RACH and transmits transmission packets to the base station apparatus such that even when many of the radio terminal apparatus belongs to this cell, a high probability is achieved, that many transmission packets are received by the base station's camera, without interfering with the transmission packets transmitted from other apparatus of the radio communication terminal. As a result, according to the invention, the radio terminal apparatus transmits duplicate transmission packets to RACH without waiting for a response from the base station apparatus to confirm whether the transmission packets transmitted to the RACH were received at the base station or not, thus setting up an individual channel to the base station In a short period of time.
Description of the figures [0032]
Fig. 1 shows a configuration of a radio terminal system using a direct access method according to embodiment 1 of the invention;
Fig. 2 is a block diagram illustrating the configuration of a radio terminal apparatus according to embodiment 1 of the invention;
Fig. 3 is a flowchart describing a direct access method according to embodiment 1 of the invention;
Fig. 4A illustrates the allocation of a RACH transmission packet according to embodiment 1 of the invention; Fig. 4B illustrates the allocation of a RACH transmission packet according to embodiment 1 of the invention; Fig. 4C illustrates the allocation of a RACH transmission packet according to embodiment 1 of the invention; Fig. 4D illustrates the allocation of a RACH transmission packet according to embodiment 1 of the invention; Fig. 5A illustrates the allocation of a RACH transmission packet according to embodiment 1 of the invention; FIG. 5B illustrates the allocation of a RACH transmission packet according to embodiment 1 of the invention; Fig. 5C illustrates the assignment of a RACH transmission packet according to embodiment 1 of the invention; Fig. 5D illustrates the allocation of a RACH transmission packet according to embodiment 1 of the invention; Fig. 5E illustrates the allocation of a RACH transmission packet according to embodiment 1 of the invention; FIG. 6 is a block diagram illustrating the configuration of an apparatus of a radio communication terminal according to embodiment 2 of the invention;
Fig. 7 is a flowchart describing a direct access method according to embodiment 2 of the invention;
Fig. 8 is a block diagram illustrating the configuration of a radio terminal apparatus according to embodiment 3 of the invention;
-6Fig. 9 is a flowchart describing a direct access method according to embodiment 3 of the invention;
Fig. 10 is a block diagram illustrating the configuration of a radio terminal apparatus according to embodiment 4 of the invention;
Fig. 11 is a flowchart describing a direct access method according to embodiment 4 of the invention;
Fig. 12A shows the correlation between priority, the number of radio terminal apparatus belonging to the same cell, and the number of duplicate transmission packets according to embodiment 4 of the invention;
Fig. 12B shows the correlation between priority, the number of radio terminal apparatus belonging to the same cell and the number of duplicate transmission packets according to embodiment 4 of the invention.
Best Mode for Carrying Out the Invention (Embodiment 1) [0033] Fig. 1 is a configuration diagram of a radio communication system consisting of four apparatus of the 200-1 to 200-4 radio communication terminal and the base station apparatus 100, which sets up individual channels using a direct access method according to embodiment 1 of the invention. In Fig. 1, the communication area of the radio communication system is designated as "cell A". In addition, in cell A of Fig. 1 OFDM (orthogonal frequency division multiplication) signal is subjected to packet exchange. In addition, the configurations and operation of the 200-1 to 200-4 radio terminal apparatus will be discussed below, but the 200-1 to 200-4 radio terminal apparatus are of the same configuration and the same function, so branch numbers can be omitted when explanations of the function and the like are performed in full.
[0034] Fig. 2 is a block diagram of the configuration of the radio terminal apparatus 200. The radio terminal apparatus 200 includes a packet generating section 201, duplication section 202, allocation section 210, packet multiplexing section 221, transmission section 222 and antenna element 223. In addition, the allocation section 210 includes the allocation sections of the RACH 211-1 to 211-c subchannel. In addition, "c" is any natural number of two or more.
[0035] The transmission packet generating section 201 generates a transmission packet including information about the radio terminal 200 apparatus necessary to set up an individual channel to the base station apparatus 100 when the radio terminal 200 apparatus is started or restored from the idle state, and provides the generated transmission packet to duplicate section 202.
[0036] The duplication section 202 duplicates the input transmission packet from the transmission packet generating section 201 and provides c duplicate transmission packets according to the sub-channel assignment section RACH 211-1 to 211-c.
[0037] The RACH 211 sub-channel allocation section randomly allocates input transmission packets from duplicate section 202 to any subcarriers with any RACH time slots. The allocation section 210 mutually compares the results of the RACH 211-1 subchannel allocation section to 211-c, and when transmission packets are allocated to the same subcarrier with the same time slot with coverage, the allocation section 210 instructs one of the RACH 211 subchannel allocation sections to again performed the assignment. The allocation section 210 then instructs the allocation sections 211-1 to 211-c to specify transmission packets to the packet multiplexing section 221 with subcarriers assigned assigned slots
- time after confirming that the time slots and subcarriers allocated by the RACH 211-1 to 211-c subchannel allocation sections do not coincide. The sub-channel allocation sections RACH 211-1 to 211-c report transmission packets at a predetermined time and frequency to the packet multiplexing section 221 according to the instructions in the allocation section 210.
[0038] The packet multiplexing section 221 multiplexes input transmission packets from the sub-channel allocation section of RACH 211-1 to 211 reports multiplexed transmission packets to the radio transmission section 222.
[0039] The radio transmission section 222 consists of an S / P converter, IFFT, P / S converter, safety interval insertion camera, bandpass filter, C / A converter, low noise amplifier and the like, and after OFDM signal generation (multiplexing from orthogonal frequency division) from the input transmission packet from the 2211 multiplexing section, the radio transmission section 222 transmits the generated OFDM signal via the radio transmitter to the base station apparatus 100 via antenna element 223.
[0040] Next, the operations of the apparatus of the radio communication terminal 200 will be explained using Fig. 3. Fig. 3 is a flowchart illustrating the steps of a direct access method according to this embodiment.
[0041] First, in step ST310, the duplication section 202 duplicates c input transmission packets from the generation section of transmission packet 201.
[0042] Then, in step ST320, the RACH subchannel allocation sections 211-1 to 211-c randomly allocate input transmission packets from duplicate section 202 to any subcarriers in any RACH time slots.
[0043] Then, in step ST330, the allocation section 210 determines whether or not the allocation results by the allocation subchannel sections of RACH 211-1 to 211-c. When the allocation section 210 determines in step ST330 that the allocation results by the allocation section of the RACH subchannel 211 coincide, the allocation section 210 forces one of the allocation sections of the RACH subchannel 211 that caused the overlap to reallocate according to step ST320. On the other hand, when the allocation section 210 determines in step ST330 that the allocation results by the allocation section of the RACH sub-channel 211 do not coincide, step ST340 is performed.
[0044] Then, in step ST340, the radio transmission section 222 generates an OFDM signal from the input transmission packet from the packet multiplexing section 221, and transmits the generated OFDM signal via the radio transmitter to the base station apparatus 100 via RACH via antenna element 223.
[0045] Figs. 4A to 4D and Figs. 5A to 5E show a specific aspect of allocating a transmission packet to any subcarriers in any RACH time slots by the direct access method according to this embodiment. In this embodiment, the allocation section of the RACH 211 subchannel is assumed to process five subcarriers (SCs) and five time slots (TSs) as RACH units and randomly assigns transmission packets within that one unit.
[0046] Fig. 4A illustrates the allocation of RACH transmission packets in the 200-1 radio terminal apparatus, and Figures 4B to 4D show the 200-2 to 200-4 radio communication apparatus, respectively. Fig. 4A to Fig. 4D illustrate the aspect of randomly allocating transmission packets to one of the time slots and to one of the RACH subcarriers, and Fig. 4B to one of the subcarriers through all RACH time slots, and Fig. 4C to one of the time slots in SC3 RACH.
[0047] Figs. 5A to 5E show the transmission conditions of the 200-1 to 200-4 radio communication terminal apparatus about SC1 to SC5 at times TS1 to TS5, when the 200-1 to 200-4 radio communication terminal apparatus transmit packets transmission according to the assignment aspects shown in Figs. 4A to 4D. Accordingly, Figure 5A shows the transmission condition in TS1, Figure 5B in TS2, Figure 5C in TS3, Figure 5D in TS4, and Figure 5E in TS5. In fig. 5A to 5E, "x" is attached to all colliding transmission packets and "O" to transmission packets received first in the base station apparatus 100, for each apparatus of the 200-1 to 200-4 radio communication terminals.
[0048] As shown in Figs. 5A to 5E, individual channels may be combined with the base station apparatus 100 respectively at the time of TS1 in the apparatus of the 200-1 radio communication terminal, at the time of TS3 in the apparatus of the 200-3 radio communication terminal and at the time of TS4 in apparatus of the 200-4 radio communication terminal.
[0049] In this way, according to this embodiment, the radio terminal apparatus 200 randomly allocates a plurality of uplinked and allocated RACH transmission packets in the sub-channel allocation sections RACH 211-1 to 211-c, and transmits transmission packets in allocated time slots and subcarriers without waiting for a response from the base station apparatus 100 to the first transmission packets, thereby setting up an individual channel to the base station apparatus 100 in a short time.
[0050] Furthermore, many transmission packets are randomly assigned to time slots only according to the apparatus of the radio communication terminal 200-2 according to this embodiment, and to the RACH subcarrier only according to the apparatus of the radio communication terminal 200-3 so that it is possible to limit the signal processing load in the allocation section of the RACH 211 subchannel necessary for allocating transmission packets compared to the case, when multiple transmission packets are randomly assigned to RACH time slots and subcarriers.
[0051] Furthermore, according to the apparatus of the radio communication terminals 200-1 to 200-4 according to this embodiment, the sub-channel allocation section of RACH 211 randomly assigns multiple transmission packets to one of the RACH time slots and also to one of the RACH subcarriers so that even when many apparatus of radio communication terminals 200 belongs to the same cell, it is possible to limit the collision probability of transmission packets in RACH.
[0052] In addition, the following applications and changes in the direct access method and apparatus of the radio communication terminal 200 according to this embodiment may be possible.
[0053] This embodiment describes a case in which many apparatus of radio communication terminals 200 randomly allocates transmission packets to RACH time slots and subcarriers, but the invention is not limited to this and, for example, it is also possible that many apparatus of communication terminals radio 200 transmits not OFDM signal, but single carrier packet data signals by radio communication, and allocates these packet data signals randomly to any RACH time slots.
[0054] Furthermore, in this embodiment, a case is described in which the radio terminal 200 apparatus randomly allocates and transmits transmission packets to RACH time slots and subcarriers, and the invention is not limited to this and, for example, it is possible for the apparatus radio terminal 200 randomly selects spreading codes instead of RACH time slots and subcarriers, and also performs code splitting of transmission packets using selected spreading codes. Furthermore, it is possible that the radio terminal 200 apparatus randomly allocates packets to the RACH subchannel, with time slots, subcarriers and spreading codes being set items. As a result of,
Even if many apparatus of the radio communication terminal 200 belong to the same cell, it is possible to further reduce the collision probability of transmission packets in RACH.
(Embodiment 2) [0055] Fig. 6 is a block diagram illustrating the configuration of the apparatus of the radio communication terminal 600, according to embodiment 2 of the invention. The radio terminal apparatus 600 also includes a priority determining section 601 and a section for determining the number of duplicates 602 in the radio terminal apparatus 200, explained in embodiment 1. Therefore, the radio terminal 600 apparatus has many elements to show the same function as the radio terminal 200 apparatus components, so these elements are assigned the same numerical references as the 200 radio terminal apparatus components and their descriptions will be omitted .
[0056] Priority determination section 601 defines priority according to the types of services planned by the radio terminal apparatus 600 after commencing communication with the base station apparatus 100. For example, in connection services and video streaming services, because the allowable delay time is short (the QoS delay requirement is demanding), the priority determination section 601 specifies that high priority is necessary in the radio terminal apparatus 600 provided for planning such a service. The 601 priority determination section then provides the priority information to the 602 duplicate determination section.
[0057] The duplicate determination section 602 compares the input priority information from the priority determination section 601 with a predetermined conversion table, determines the number of duplicates corresponding to the priority, and reports the specified number of duplicates to duplicate section 202.
[0058] Next, the operations of the radio terminal 600 apparatus will be explained using Fig. 7. Fig. 7 is a flowchart explaining the steps of a direct access method according to embodiment 2 of the invention.
[0059] First, in step ST710, the priority determination section 601 determines the priority of the apparatus of the radio communication terminal 600 based on the input information about the QoS delay requirements from the control section or the like (not shown).
[0060] Then, in step ST720, the duplicate number determining section 602 determines the number of duplicate transmission packets based on the priority specified in step ST710, and provides information about the number of duplicates to the duplicate section 202.
[0061] Next, steps ST310 to 340 in embodiment 1 are sequentially performed.
[0062] Here, an example of the conversion table contained in the section for determining the number of duplicates 602 will be shown below in Table 1. This conversion table was prepared such that a = 1, based on the fact that c = a<sup>x</sup>p- (1) (c is the number of duplicates, α is a constant, ap is a priority).
(Table 1)
Priority
Number of Duplicates
<td> 5 :</td><td> 5</td>
<td> 4 :</td><td> 4</td>
<td> 3 :</td><td> 3</td>
<td> 2 :</td><td> 2</td>
<td> 1 :</td><td> 1</td>
[0063] In this way, according to the direct access method according to this embodiment, the number of duplicate transmission packets in duplicate section 202 is determined based on the types of services to
The planning after individual channel setup, and the requirement for QoS delay from multiple apparatus of the radio communication terminal 600 becomes more demanding so that it is possible to set up an individual channel to the base station apparatus 100 in a short time. As a result, according to the direct access method of this embodiment, problems of communication deterioration, a state of inaccessibility for communication, and the like are less likely to occur in many of all apparatus of the radio communication terminal 600 belonging to the same cell.
(Embodiment 3) [0064] Fig. 8 is a block diagram illustrating the configuration of the apparatus of the radio communication terminal 800, according to embodiment 3 of the invention. The radio terminal apparatus 800 also includes a section for determining the number of duplicates 802 in the radio terminal apparatus 200, explained in embodiment 1. The apparatus of the radio terminal 800 contains a number of elements to show the same function as the elements of the apparatus of the radio communication schedule 200, so these elements are assigned the same numerical references as the elements in the apparatus of the radio terminal 200 and their descriptions will be omitted.
[0065] The duplicate determination section 802 compares the retransmission input information from the priority determination section 601 with a predetermined conversion table, determines the number of duplicates corresponding to the number of retransmissions, and provides information about the specified number of duplicates to duplicate section 202. In addition, the "number of retransmissions" in this embodiment is increased each time all TS1 doTSS shown in any of Figs. 4 to 4D are transmitted. [0066] Next, the apparatus operations of the radio communication schedule 800 will be explained using Fig. 9. Fig. 9 is a flowchart explaining the steps of a direct access method according to this embodiment.
[0067] First, in step ST910, the duplicate determination section 802 compares the input retransmission number with a predetermined conversion table, determines the number of duplicate transmission packets, and provides information on the number of duplicates to duplicate section 202.
[0068] Then, steps ST310 to 340 in embodiment 1 are sequentially carried out.
[0069] Here, an example of the conversion table contained in the section on determining the number of duplicates 802 will be shown below in Table 2. This conversion table was prepared so that β = 1, based on the fact that c = F * β · (1) {c is the number of duplicates, F is the number of retransmissions, and β is a constant}.
(Table 2)
<td>Number of retransmissions</td><td>Number of Duplicates</td>
<td> 5</td><td> 6</td>
<td> 4</td><td> 5</td>
<td> 3</td><td> 4</td>
<td> 2</td><td> 3</td>
<td> 1</td><td> 2</td>
[0070] Thus, according to the direct access method according to this embodiment, the number of transmission packets from the radio communication schedule 800 to the base station apparatus of the station 100 via RACH increases in accordance with the number of retransmissions such that from many apparatus of the radio terminal 800 belonging to to the same cell, the most urgent one is more likely to set up an individual channel for the base station apparatus 100 in a short time. As a result, according to the direct access method according to this embodiment, problems of communication deterioration,
- the lack of availability for communication and the like are less likely to occur in many of the 800 radio communication terminals belonging to the same cell.
(Embodiment 4) [0071] Fig. 10 is a block diagram illustrating the configuration of the apparatus of the radio communication terminal 1000 according to embodiment 4 of the invention. The radio terminal apparatus 1000 also includes a radio reception section 1001, a control information extraction section 1002 and a section for determining the number of duplicates 1003 in the radio terminal apparatus 200, explained in embodiment 1. The apparatus of the radio terminal 1000 contains many elements to show the same function as the elements of the apparatus of radio terminal 200, so these elements are assigned the same numerical references as the elements in the apparatus of radio terminal 200 and their descriptions will be omitted.
[0072] Radio reception apparatus 1001 includes a bandpass filter, A / C converter, low noise amplifier, C / A converter, FFT apparatus, P / S converter and the like and receives an OFDM signal to notify several apparatus of radio communication terminals 1000, which belong to A cell, transmitted regularly from the base station terminal 100 via antenna element 223, and when the reception of the predetermined reception signal leading to the OFDM signal occurs, radio reception section 1001 provides an OFDM signal to the control information extraction section 1002.
[0073] The control information extraction section 1002 extracts information about the number of radio communication terminal apparatus 1000 belonging to cell A from the input signal from radio reception section 1001 and provides the extracted control information to the duplicate number determination section 1003. [0074] The duplicate determination section 1003 compares the input control information from the control information extraction section 1002 with a predetermined conversion table, determines the number of duplicates corresponding to the control information, and provides information about the specified number of duplicates to duplicate section 202.
[0075] Next, the operations of the radio terminal 1000 apparatus will be explained using Fig. 11. Fig. 11 is a flowchart explaining the steps of a direct access method according to this embodiment.
[0076] First, in step ST1110, the control information extraction section 1002 extracts control information from the receiving input signal from the radio receiving section 1001.
[0077] Then, in step ST1120, the duplicate number determination section 1003 finds out the number of radio terminal 1000 apparatus belonging to cell A, based on control information, and determines the number of duplicates corresponding to that number with respect to the conversion table provided in advance. [0078] Steps ST310 to 340 in embodiment 1 are sequentially performed.
[0079] Here, an example of the conversion table contained in the section for determining the number of duplicates 1003 will be shown below in Table 3. In Table 3, the RACH 211 subchannel allocation section is assumed to process a total of 1,000 RACH subchannels composed of 10 time slots and 100 subcarriers for each time slot as a RACH unit, allocating a maximum of 100 transmission packets in one unit and in addition, the 1000 radio terminal apparatus is one of the priorities 1 to 5.
{Table 3)
Priority / Number of duplicates (number of terminals) / (20) :( 35) :( 100)
-125 / 7 (4): 5 (7): 1 (20) / 6 (4): 4 (7): 1 (20) / 5 (4): 3 (7): 1 (20) / 4 ( 4): 2 (7): 1 (20) / 1 (4): 1 (7): 1 (20) Total number of duplicates: 92: 98: 100 [0080] In addition, Fig. 12A shows the correlation between the number of apparatuses 1000 radio communication terminals belonging to cell A and a number of duplicates at priority 5 in this embodiment. In addition, in fig. 12B shows the correlation between the number of 1000 radio communication terminal apparatus belonging to cell A and the number of duplicates at priority 3 in this embodiment. As shown in Figs. 12A and 12B, this embodiment is shown so that the number of duplicate transmission packets in duplicate section 202 decreases as the number of radio communication terminal 1000 apparatus belonging to the same cell increases.
Accordingly, according to the direct access method of this embodiment, since the number of 1000 radio communication terminal apparatus belonging to the same cell increases, the number of transmission packets transmitted by the 1000 radio communication terminal apparatus decreases, it is possible to limit the probability of collision transmission packets in RACH in the same cell. As a result, according to the direct access method of this embodiment, problems of communication deterioration, a state of inaccessibility for communication and the like have a lower probability of occurrence in many of all apparatus of radio communication terminals 1000 belonging to the same cell.
[0082] Furthermore, although the above embodiments describe a case in which duplicate transmission packets are multiplexed and transmitted in subcarriers or time slots, where, for example, other resources such as the radio terminal apparatus 200 includes multiple transmit antennas, multiplexing and transmitting duplicate transmission packets in spatial resources, such as transmitting antenna and differentiation scheme, and scatter codes in the CDMA system.
[0083] Furthermore, the function blocks used in the descriptions of the above embodiments are usually implemented as LSI being an integrated circuit. They may be individual integrated circuits, or may be partially or completely contained on a single substrate.
[0084] This document adopts "LSI", but the names "IC", "system LSI", "super LSI" or "ultra LSI" may also be used depending on different degrees of merging.
[0085] Furthermore, the circuit integration method is not limited to LSI and it is possible to perform using a dedicated electrical circuit assembly or general purpose processors. After LSI production, it is also possible to use FPGA (programmable logic gate matrix) or a processor with variable configuration, in which connections and settings of the LSI circuit cells can be reconfigured.
[0086] In addition, if integrated circuit technology emerges that replaces LSI as a result of advances in semiconductor or other derivative technology, it is naturally also possible to perform
- the function block be cut down using such technology. Application in the field of biotechnology is also possible.
Industrial Applicability [0087] The direct access method and apparatus of the radio communication terminal according to the invention provides the advantage of setting up an individual channel to the base station in a short time, and is effective in use in a radio communication system and the like with a planned service requesting a QoS delay requirement .
54 members in 10 offices
Priority claims2
| Document | Office | Kind | Date |
|---|---|---|---|
| 2004065625 | Japan | A | |
| 2005003329 | Japan | W |
Members54
| Document | Office | Kind | |
|---|---|---|---|
| WO2005086520A1 | World Intellectual Property Organization (WIPO) | A1 | |
| EP1715709A1 | European Patent Office (EPO) | A1 | |
| KR20060126811A | Republic of Korea | A | |
| CN1926908A | China | A | |
| BRPI0508580A | Brazil | A | |
| US2007195730A1 | United States of America | A1 | |
| JPWO2005086520A1 | Japan | A1 | |
| RU2006132728A | Russian Federation | A | |
| CN100515117C | China | C | |
| CN101562844A | China | A | |
| RU2389158C2 | Russian Federation | C2 | |
| US7873000B2 | United States of America | B2 | |
| JP2011015438A | Japan | A | |
| KR20110031247A | Republic of Korea | A | |
| US2011081916A1 | United States of America | A1 | |
| EP1715709A4 | European Patent Office (EPO) | A4 | |
| KR20110070926A | Republic of Korea | A | |
| JP4734233B2 | Japan | B2 | |
| RU2010102421A | Russian Federation | A | |
| US8000295B2 | United States of America | B2 | |
| JP2011166831A | Japan | A | |
| JP4776738B2 | Japan | B2 | |
| JP2011199886A | Japan | A | |
| US2011243109A1 | United States of America | A1 | |
| KR101100979B1 | Republic of Korea | B1 | |
| KR101100996B1 | Republic of Korea | B1 | |
| KR101103230B1 | Republic of Korea | B1 | |
| EP2615883A1 | European Patent Office (EPO) | A1 | |
| RU2504118C2 | Russian Federation | C2 | |
| JP5433629B2 | Japan | B2 | |
| US8761131B2 | United States of America | B2 | |
| US2014254571A1 | United States of America | A1 | |
| US9060356B2 | United States of America | B2 | |
| BRPI0508580A8 | Brazil | A8 | |
| US2015264719A1 | United States of America | A1 | |
| US9363830B2 | United States of America | B2 | |
| US2016270067A1 | United States of America | A1 | |
| CN101562844B | China | B | |
| US9615359B2 | United States of America | B2 | |
| EP1715709B1 | European Patent Office (EPO) | B1 | |
| US2017181157A1 | United States of America | A1 | |
| ES2635864T3 | Spain | T3 | |
| PL1715709T3This record | Poland | T3 | |
| US10028262B2 | United States of America | B2 | |
| US2018302897A1 | United States of America | A1 | |
| EP2615883B1 | European Patent Office (EPO) | B1 | |
| BRPI0508580B1 | Brazil | B1 | |
| EP3442302A1 | European Patent Office (EPO) | A1 | |
| ES2708305T3 | Spain | T3 | |
| PL2615883T3 | Poland | T3 | |
| US10667245B2 | United States of America | B2 | |
| US2020260437A1 | United States of America | A1 | |
| EP3442302B1 | European Patent Office (EPO) | B1 | |
| ES2985074T3 | Spain | T3 |
Numbers
- Application
- 5719646
Titles2
- English
- RANDOM ACCESS METHOD AND RADIO COMMUNICATION TERMINAL DEVICE
- Polish
- Sposób dostępu bezpośredniego i urządzenie terminala komunikacji radiowej
Classification
- CPC, 10
- H04W74/0833
- H04W72/21
- H04W36/16
- H04W72/04
- H04W72/0446
- H04W88/08
- H04W74/004
- H04W72/543
- H04W72/56
- H04W72/0453
- IPC, 4
- H04W36 16
- H04W72 54
- H04W74 00
- H04W74 0833