WO2005104492A1

WO2005104492A1 - Communication terminal apparatus and transmitting method

Info

Publication number: WO2005104492A1
Application number: PCT/JP2005/007395
Authority: WO
Inventors: Hidetoshi Suzuki
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2004-04-23
Filing date: 2005-04-18
Publication date: 2005-11-03
Also published as: JP2005311882A

Abstract

A communication terminal apparatus capable of reducing transmission delay and performing an efficient system operation. In this apparatus, based on the results of determinations at an initial transmission and at a retransmission; transmission data amount information indicative of the amount of data that are desired to be transmitted on the respective channels; information of priorities of TrCHs; information of priorities that are different between the initial transmission and the retransmission; and based on information of transmission power of an upstream line, a MAC part (107) selects a TFC having a combination of the transmission rates of the channels on which transmission can be performed with a predetermined transmission power. At this moment, in the TrCHs performing HARQ, the priorities, which are different between the initial transmission and the retransmission, are designated from an RRC part (106) to the same TrCHs. When the TrCHs perform HARQ, the MAC part (107) outputs transmission data to an encoding part (112). When the TrCHs are not adapted to perform transmission of HARQ, the MAC part (107) outputs the transmission data to an encoding part (108).

Description

Specification

Communication terminal device and transmission method

Technical field

The present invention relates to a communication terminal device and a transmission method, and more particularly, to a communication terminal device and a transmission method applied to a system for performing scheduling in uplink.

Background art

[0002] In the WCDMA (Wideband Code Division Multiple Access) system, a high-speed packet transmission system called HSDPA (High-Speed Downlink Packet Access) is known as a technique for transmitting packet data on the downlink. In addition, a standardization organization, 3GPP, is studying a method called Uplink Enhancement or HSUPA (High-Speed Uplink Packet Access) for high-speed packet transmission and low delay in uplink transmission.

[0003] In the uplink of a wireless communication system, when the total transmission power of the communication terminal device exceeds the maximum transmission power, control such as stopping transmission on the V or shifted channel or reducing the transmission rate is performed. It is necessary to make sure that the total transmission power does not exceed the maximum transmission power. As a method for realizing this, Transport Format Combination Selection (hereinafter referred to as “TFC selection”) is known (for example, Non-Patent Document 1).

[0004] TFC selection is a combination of transport formats indicating the amount of data to be transmitted on each DCH when the communication terminal apparatus multiplexes and transmits data on a plurality of DCHs (individual channels). Transport format combination

(Transport Format Combination: hereafter abbreviated as “TFC”). Judge whether the total transmission power does not exceed the maximum transmission power by! / ヽ and select a transmittable TFC.

[0005] The total transmission power is limited by the capability of the communication terminal itself or by a network device such as a base station temporarily issuing a command to limit the transmission power of the communication terminal to the communication terminal. In some cases. By controlling the transmission rate of each communication terminal device or the total transmission power of each communication terminal device in the uplink by a network device such as a base station, the amount of uplink interference can be controlled. The same frequency such as CDMA uplink In the scheme shared by the communication terminals, the amount of uplink interference determines the capacity of the system. For this reason, in the uplink, scheduling is performed such that communication terminal equipment in a state with good propagation conditions is intensively allocated to network equipment such as base stations, and communication terminal equipment with poor propagation conditions is not allocated as much as possible. By performing the operation, the amount of uplink interference can be controlled, and the system can mainly use a state with good propagation conditions. As a result, the system capacity can be improved.

Non-Patent Document 1: 3GPP TS25.133 v5.9.0 section6.4 Transport format combination selection in UE

Disclosure of the invention

Problems to be solved by the invention

[0006] However, the conventional apparatus has a problem that high quality transmission cannot be performed when an error occurs. To enable high-quality transmission, a method of requesting automatic retransmission when an error occurs is conceivable.

[0007] In an automatic retransmission request, a transmitting side and a receiving side are connected by a bidirectional transmission path, and a packet including a codeword generated by performing error detection coding on information bits by the transmitting side is transmitted to a receiving side. The sending and receiving sides detect errors. If no error is detected in the received data, the receiving side returns an acknowledgment signal Ack (Positive Acknowledgment) indicating that the data was received correctly to the transmitting side, and if an error is detected in the received data, the retransmission request signal Nack ( Negative Acknowledgment) to the sender. The sender retransmits the same packet upon receiving Nack. The sender repeats retransmission of the same packet until receiving the Ack. However, in the automatic retransmission request, there is a problem that the retransmission is repeated, thereby increasing the transmission delay and deteriorating the efficiency of the entire system. In particular, when the propagation environment is poor, the error rate of the data increases, so that there is a problem that the number of retransmissions increases and the transmission delay increases rapidly.

[0008] Further, in a conventional apparatus, a communication terminal apparatus in which transmission power in an uplink is limited in a base station apparatus has a limited amount of data that can be transmitted, so that communication in which such transmission power is limited is performed. There is a problem that a terminal device cannot transmit transmission data efficiently. Also, in the conventional device, it exists at the cell boundary, etc., and Since the amount of data that can be transmitted is limited in a communication terminal device whose transmission power is close to the limit of the transmission capability of the mobile station, such a communication terminal device whose transmission power is limited can reduce the transmission data efficiency. There is a problem that it cannot be sent well.

An object of the present invention is to provide a communication terminal device and a transmission method capable of reducing transmission delay and performing efficient system operation in a system transmitting a plurality of channels. It is.

Means for solving the problem

[0010] The communication terminal device according to the present invention is configured to correct the transmission data at the first transmission or the error of the transmission data at a communication partner based on the priorities at the time of the first transmission and at the time of retransmission. Transmission rate setting means for variably setting the transmission rate of retransmission data at the time of retransmission for each channel, and combining the transmission data or the retransmission data at the transmission rate set by the transmission rate setting means between channels. And a transmitting unit that transmits the combined transmission data generated by the combining unit.

[0011] The transmission rate setting method of the present invention is a method for correcting transmission data at the first transmission or an error of the transmission data at a communication partner based on priorities at the time of the first transmission and at the time of retransmission. The transmission rate of the retransmission data at the time of the retransmission is variably set for each channel.

[0012] The transmission method of the present invention is a communication method for correcting transmission data at the first transmission or an error of the transmission data at a communication partner based on priorities at the time of the first transmission and at the time of retransmission. A step of variably setting a transmission rate of retransmission data at the time of retransmission for each channel, and generating combined transmission data by combining the transmission data at the set transmission rate or the retransmission data between channels; Transmitting the generated combined transmission data.

[0013] The communication method of the present invention is a communication method for correcting transmission data at the time of the first transmission or an error of the transmission data at a communication partner based on priorities at the time of first transmission and retransmission. A step of variably setting the transmission rate of retransmission data at the time of retransmission for each channel; and transmitting the transmission data or the retransmission data at the set transmission rate to the channel. Generating combined transmission data by combining them, transmitting the generated combined transmission data, receiving the combined transmission data, and transmitting and receiving the combined transmission data. Separating the combined transmission data into data of each channel based on information on the transmission rate of the transmission data or the retransmission data; and, if the retransmission data exists in the separated data, Decoding the received data with error correction by the retransmission data.

The invention's effect

According to the present invention, in a system transmitting a plurality of channels, transmission delay can be reduced and efficient system operation can be performed.

Brief Description of Drawings

FIG. 1 is a block diagram showing a configuration of a communication terminal device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a base station apparatus according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a MAC unit according to the embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a communication system according to an embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a TFC according to an embodiment of the present invention and a transmission rate of each channel. FIG. 6 is a diagram illustrating an order of priority at the time of initial transmission and retransmission of each channel according to an embodiment of the present invention. Diagram showing the relationship with rank

FIG. 7 is a diagram showing a state transition according to the embodiment of the present invention.

FIG. 8 is a diagram showing a state of each TFC according to the embodiment of the present invention.

FIG. 9 is a diagram showing a state of each TFC according to the embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment)

FIG. 1 is a block diagram showing a configuration of communication terminal apparatus 100 according to the embodiment of the present invention. In the present embodiment, a transport channel (hereinafter referred to as “TrCH”) 1

The case where transmission data is transmitted by TrCH2 and TrCH3 will be described.

[0018] Antenna 101 transmits the transmission data output from switching section 102 to a base station apparatus, which will be described later, and also receives the transmitted data and outputs the transmission data to switching section 102. Switching section 102 outputs the transmission data input from transmission RF section 119 to antenna 101 during transmission, and outputs the reception data input from antenna 101 to reception RF section 103 upon reception.

[0020] Reception RF section 103 down-converts the reception data input from switching section 102 to a baseband frequency in radio frequency power and outputs the result to despreading section 104.

[0021] Despreading section 104 despreads the received data input from received RF section 103 using a predetermined spreading code, and outputs the result to demodulation section 105.

[0022] Demodulation section 105 demodulates the received data input from despreading section 104 and outputs the demodulated data to RRC section 106 and MAC section 107.

[0023] RRC section 106 receives, from the received data input from demodulation section 105, transmission rate selection information, which is information indicating the priority of each channel and the first transmission and retransmission between channels, and A plurality of transmission rates are set, one of the set transmission rates is selected for each channel, and TFC selection information (transmission rate information), which is information on the transmission rate combined, is extracted and output to the MAC unit 107.

[0024] MAC section 107, which is a transmission rate setting means, extracts an Ack signal or a Nack signal from the received data input from demodulation section 105, and determines the first transmission and retransmission or the number of retransmissions. Do. Then, MAC section 107 determines whether transmission has been performed for each channel at the time of initial transmission and retransmission or the number of retransmissions,! / Transmission data amount information indicating the amount of data, and transmission rate selection input from RRC section 106. Information, the TFC selection information input from the RRC section 106, and the transmission power information, which is information on the measurement result of the uplink transmission power input from the transmission RF section 119 described later, based on the allowable maximum transmission power. Select the TFC of the combination of the transmission rate of each channel that can transmit with the following specified transmission power. By selecting the TFC, the MAC unit 107 can variably set the transmission rate for each channel. When retransmission is repeated, MAC section 107 sets a different transmission rate for each retransmission number. Then, the MAC unit 107 is set so that the TrCH performs HARQ.If not, the MAC unit 107 outputs the transmission data at the set transmission rate to the encoding unit 112, and the TrCH is set so that the TrCH performs HARQ. In this case, the transmission data at the set transmission rate is output to encoding section 108. Also, the MAC unit 107 uses the information of the selected TFC. It outputs certain TFC selection information to TFC information generation section 115. Further, MAC section 107 controls HARQ control section 111 so as not to exceed the transmission rate in the selected TFC. The details of the MAC unit 107 will be described later.

[0025] Encoding section 108 encodes the transmission data input from MAC section 107 and outputs the transmission data to interleaving section 109.

[0026] Interleaving section 109 rearranges the transmission data input from coding section 108 in a predetermined pattern and outputs the rearranged transmission data to rate matching section 110.

[0027] Rate matching section 110 performs a process of thinning out data in units of bits or a process of removing data in units of bits so that transmission data input from interleaving unit 109 fits in one frame, and performs HARQ control unit 111. Output to

[0028] HARQ section 111 is a section for transmitting as transmission bit data from transmission data input from rate matching section 110 within a range not exceeding the transmission rate of the TFC selected by MAC section 107 under the control of MAC section 107. Is selected and output to the combining unit 116.

The encoding unit 112 encodes the transmission data input from the MAC unit 107 and outputs the transmission data to the interleaving unit 113.

[0030] Interleaving section 113 rearranges the transmission data input from coding section 112 in a predetermined pattern and outputs the rearranged transmission data to rate matching section 114.

[0031] Rate matching section 114 performs processing of thinning out data in units of bits so that transmission data input from interleaving section 113 falls within one frame, or retransmission (repetition) of data within the same transmission cycle. And outputs it to the synthesizing unit 116 so that one frame is filled. Note that retransmission within the same transmission cycle is referred to as retransmission (repeatment), and retransmission in a different transmission cycle after receiving a NACK is also referred to as retransmission. Refers to retransmission. In the case of a repetition, it is described as retransmission.

[0032] TFC information generating section 115 performs processing for including the TFC information input from MAC section 107 in transmission data, and outputs the result to combining section 116.

[0033] Combining section 116 combines the transmission data at the time of retransmission inputted from HARQ control section 111 with the transmission data at the time of the first transmission inputted from rate matching section 114, and also transmits TFC information. The TFC information including the TFC information input from report generation section 115 is output to modulation section 117 as transmission data.

[0034] Modulating section 117 modulates the transmission data input from combining section 116 and outputs the result to spreading section 118.

[0035] Spreading section 118 spreads transmission data input from modulating section 117 with a predetermined spreading code, and outputs the result to transmission RF section 119.

[0036] Transmission RF section 119 up-converts transmission data input from spreading section 118 from a baseband frequency to a radio frequency, amplifies the transmission data to a predetermined power, and switches switching section 10.

Output to 2. Further, transmission RF section 119 outputs transmission power information, which is information on transmission power of the amplified transmission data, to MAC section 107.

Next, the configuration of base station apparatus 200 will be described using FIG. Figure 2 shows the base station equipment.

FIG. 2 is a block diagram showing a configuration of 200.

The antenna 201 receives data transmitted from the communication terminal device 100 and receives

Output to 02.

[0039] Reception RF section 202 downconverts the reception data input from antenna 201 to a baseband frequency in radio frequency power and outputs the result to despreading section 203.

[0040] Despreading section 203 performs despreading processing on the received data input from receiving RF section 202 with the same spreading code as that used in the spreading processing, and outputs the result to rake receiving section 204.

[0041] Rake receiving section 204 rake-combines the received data input from despreading section 203 and outputs the result to demultiplexing section 206.

[0042] The TFC determination unit 205 sets a plurality of transmission rates for each channel and selects one of the set transmission rates for each channel, as instructed by, for example, a control station that is an upper station of the base station apparatus 200. A table storing channel separation information, which is information on the combined transmission rates, is stored. Then, TFC determining section 205 also outputs rake receiving section 204 information on the transmission rate of each channel in accordance with the TFC information included in the received data input to separating section 206 to separating section 206. The TFC selection information and the channel separation information are the same information.

[0043] Separation section 206, which is channel separation means, receives reception data input from rake reception section 204. The TFC information contained in the TFC information is extracted, and the transmission rate of each channel is selected with reference to the channel separation information stored in the TFC determination unit 205 using the extracted TFC information. Then, separating section 206 separates the received data into the received data of each channel according to the selected transmission rate of each channel. Then, the separation unit 206 outputs the separated reception data to the rate dematching unit 212 in the case of the channel where HARQ is not set, and outputs the separated reception data in the case of the channel where the H ARQ is set. Is output to the rate dematching section 207.

[0044] Rate dematching section 207 performs processing to reduce the value corresponding to the intermediate value to the data thinned out at the time of transmission with respect to the received data input from demultiplexing section 206. For the data retransmitted within the same retransmission cycle (repetition), the number of data is adjusted by combining the retransmitted data, and the force is also output to the ding leave section 208.

Dinave section 208 rearranges the received data input from rate dematching section 207 so as to return to the initial arrangement, and outputs the rearranged data to storage section 209 and adder 210.

The storage unit 209 stores the received data input from the dent leave unit 208. Then, when information indicating that a retransmission request has been made because an error has occurred in the received data is input from error correction decoding section 211, storage section 209 determines the stored received data in which the error has occurred as a predetermined value. Output to the adder 210 at the timing. Further, storage section 209 does not output to adder 210 when information indicating a retransmission request is not input from error correction decoding section 211.

[0047] Adder 210 adds the received data, which is the retransmission data input from dent leave section 208, and the received data input from storage section 210, and outputs the result to error correction decoding section 211.

[0048] Error correction decoding section 211 corrects, decodes, and outputs received data input from adder 210 as received data.

[0049] Rate dematching section 212 performs processing to re-add the data that has been interleaved IV during transmission to the received data input from demultiplexing section 206, or performs processing to interpolate the data that has been interleaved during transmission. Output to section 213.

[0050] Dint leave section 213 rearranges the received data input from rate dematching section 212 so as to return to the initial arrangement, and outputs the rearranged data to error correction decoding section 214.

[0051] Error correction decoding section 214 corrects the received data input from ding leave section 213. Then, the data is decoded and output as received data.

Next, details of the configuration of MAC section 107 will be described using FIG. FIG. 3 is a block diagram showing a configuration of the MAC unit 107.

The determination unit 301 refers to the TFC selection information stored in the storage unit 302 using the transmission power information input from the transmission RF unit 119, so that the transmission power is equal to or less than the allowable maximum transmission power. The TFC of the combination of the transmission rate of each channel that can be transmitted at the predetermined transmission power in the transmission power information is searched. Then, as a result of the search, the determination unit 301 selects a TFC of a combination of transmission rates of each channel that can transmit at a predetermined transmission power with a transmission power equal to or lower than the allowable maximum transmission power, and transmits information of the selected TFC to the TFC. Output to selection section 303. It should be noted that the allowable maximum transmission power is stored by the determination unit 301 in advance. Also, the TFC selected by the determination unit 301 may be one or more.

Storage section 302 stores the TFC selection information transmitted from base station apparatus 200 in advance and extracted by RRC section 106 and then input from RRC section 106, and the maximum allowable The TFC information of the combination of the transmission rate of each channel that can be transmitted with the transmission power equal to or lower than the transmission power and the predetermined transmission power is output to the determination unit 301.

[0055] TFC selecting section 303 outputs the transmission data of each channel at the selected TFC transmission rate to encoding section 108 or encoding section 112, and transmits the transmission completion wait data. Output to the holding unit 304. Further, TFC selecting section 303 selects one TFC from the TFC information input from determining section 301 based on the priority of the transmission rate selection information input from RRC section 106. At this time, when Ack signals are input from demodulation section 105 for all channels, TFC selection section 303 determines that there is no retransmission data, and transmits retransmission data for the channel to which a Nack signal has been input from demodulation section 105. Select TFC as necessary. Further, TFC selecting section 303 outputs the TFC information to TFC information generating section 115 and controls HARQ control section 111 so as not to exceed the transmission rate of the selected TFC.

[0056] The transmission completion waiting data holding unit 304 temporarily holds the transmission data input from the TFC selection unit 303, and when the Nack signal is input from the demodulation unit 105, stores the held transmission data. Output to TFC selection section 303, and saves when Ack signal is input from demodulation section 105. Discard the transmitted data.

Next, operations of communication terminal apparatus 100 and base station apparatus 200 will be described. FIG. 4 is a diagram showing a communication system 400 using the communication terminal device 100 and the base station device 200. In FIG. 4, communication terminal apparatus 100 has the same configuration as FIG. 1, and base station apparatus 200 has the same configuration as FIG.

First, the control station 401 generates, for example, the TFC selection information shown in FIG. 5 and the transmission rate selection information shown in FIG. 6, and transmits the generated information to the base station apparatus 200. Here, for example, the transmission data of TrCHl is voice data, the transmission data of TrCH2 is streaming type packet communication data, and the transmission data of TrCH3 is WWW access type packet communication data. As a result, the channel that transmits transmission data with a shorter allowable delay time has a higher priority, and the voice data of TrCHl is always transmitted with priority, and the packet communication data of the streaming type of TrCH2 is transmitted to the WWW of TrCH3. Sent prior to access type packet communication data. Furthermore, regarding the transmission data of TrCH2, the priority at the time of retransmission is higher than that at the time of the first transmission, so that erroneous data is transmitted preferentially, and QoS management can be performed. I'm familiar. Here, the TrCH1 audio data has a low error rate requirement, but the delay time requirement is particularly severe, so HARQ is set !, na! / ,. Also, the streaming type packet communication data, which is TrCH2, requires less error rate, but the delay time is more demanding than WWW access and slower than voice. The WWW access type, which is TrCH3, has a strict error rate requirement and a strict delay time requirement. Considering these, HARQ is set for TrCH2 and TrCH3. Here, an example of three TrCHs is described, but it is not limited to three channels. In addition, the transmission rate selection information in FIG. 6 is a case where priorities are set at the time of initial transmission and at the time of retransmission, but when retransmission is repeatedly performed, a different priority may be provided for each number of retransmissions. It is possible.

[0059] Next, base station apparatus 200 that has received the TFC selection information and the transmission rate selection information stores TFC selection information as channel separation information in TFC determination section 205, and stores TFC selection information and transmission rate information. The transmission rate selection information is transmitted to the communication terminal device 100. Next, the communication terminal apparatus 100 having received the TFC selection information and the transmission rate selection information extracts the TFC selection information and the transmission rate selection information in the RRC section 106, and extracts the TFC selection information in the MAC section 107. Store the information. The processing up to this point is performed before starting communication.

[0060] Next, communication terminal apparatus 100 can transmit at MAC section 107 with the transmission power equal to or less than the allowable maximum transmission power and the predetermined transmission power of the transmission power information from the TFC selection information and the transmission power information. Select the TFC for the combination of transmission rates. For example, when the transmission data amount information indicating that data transmission has been performed on all channels is input, and there is no retransmission data even when the V or deviation channel is used, if the maximum transmission power is less than the maximum permissible transmission power When the total number of bits of TrCH1 to TrCH3 is 500 bits as the transmission rate of each channel that can be transmitted at the predetermined transmission power of the transmission power information with the transmission power of 500, the MAC unit 107 calculates the total bits of TrCH1 to TrCH3. Select TFC = 2, TFC = 3, TFC = 4, TFC = 6, and TFC = 7 as TFCs whose number does not exceed 500 bits. As a result, as shown in FIG. 7, the MAC unit 107 sets the TFC = 1 and TFC = 5 to `` Blocked statej '' indicating transmission prohibition, and sets TFC = 2 to TFC = 4, TFC = 6 and TFC = 7. As a “Supported state indicating transmission permission”, each TFC is brought into the state shown in FIG. As described above, the communication terminal apparatus 100 continuously applies the evaluation criterion of Elimination Blockings Recovery for each TFC using information on the transmission power of each slot of the communication terminal apparatus 100, and “¾upported statej,“ Excess-power State transition of statej and “Blocked statej” is performed.

[0061] Specifically, when the communication terminal apparatus 100 transmits the selected TFC in, for example, 15 slots out of 30 slots, if the transmission power exceeds the allowable maximum transmission power, the Elimination criterion is set. Judge that it is satisfied, and it becomes Excess-power state. After entering the Excess-power state, it enters the Blocked state after a certain period of time.

The length of the transition to the Blocked state is determined in consideration of the time required to change the bit rate in the upper layer, the interleave length, and the signal transmission delay from Layer 1 to the upper layer. If the transmission power does not exceed the maximum allowable transmission power continuously for 30 slots when TFC is transmitted, it is determined that the Recovery criterion has been satisfied and the state transits to the Supported state.

[0062] Next, MAC section 107 has the highest priority of TrCHl from the transmission rate selection information in FIG. High, so the selected TFC = 2, TFC = 3, TFC = 4, T = 6 and T = 7 Bit number power of TrCHl Not O bit TFC = 2, T? J = 3 and Ding? Select = 4. Next, since the transmission data of TrCH2 has a higher priority than the transmission data of TrCH3 from the transmission rate selection information in FIG. 6, the MAC section 107 selects the TFC = 2, TFC = 3 and TFC = 4 Also choose TFC = 2 for medium power. Accordingly, MAC section 107 outputs 100 bits as TrCH1 transmission data to encoding section 112, and outputs 200 bits as TrCH2 transmission data to encoding section 108. The combining unit 116 combines the transmission data of TrCH1 and the transmission data of TrCH2. At this time, the transmission data of TrCH3 becomes 0.

[0063] Next, data transmission is performed on all channels. When transmission data amount information is input and TrCH2 has retransmission data remaining and TrCHl and TrCH3 have no retransmission data, the maximum permissible transmission is performed. If the total bit number of TrCH1 to TrCH3 is 500 bits as the transmission rate of each channel that can be transmitted at the transmission power equal to or lower than the power and the predetermined transmission power of the transmission power information, TFC = 2 in the same order as above Retransmission data is sent for the force Tr CH2 for which is selected. By this means, MAC section 107 outputs 100 bits to TrCH1 transmission data to encoding section 108, and outputs 200 bits to TrCH2 retransmission data to encoding section 108, and combining section 116 transmits TrChl transmission data and Combine the retransmission data of TrCH2.

[0064] At this time, retransmission data is transmitted by HARQ, which is a method for performing error correction and retransmission together in TrCH2. As HARQ, erroneous data is discarded on the receiving side and retransmitted data is decoded independently, and no combining processing is performed between the first data and retransmitted data! / ヽData that is not discarded at the receiving end and combined with additional redundant bits of retransmitted data, and is decoded, or Type 3 that is capable of decoding even single retransmitted data, which is the same method as Type 2. It is possible to adopt any of the methods called. Another HARQ classification method is a method called Chase combining, in which the same data is transmitted in the initial transmission and retransmission, and the receiving side combines the initial data and retransmission data to perform power error correction decoding. Some or all of the parity bit data to be sent are different between the transmission and retransmission. The same part of the bit data may be combined and error-correction-decoded by either of the methods called Incremental redundancy. Incremental redundancy methods include a method that does not send systematic bit data during retransmission and a method that sends systematic bits, and both methods can be applied.

[0065] Next, when the transmission data of TrCH3 is transmitted, the transmission data amount information is input, and if there is no retransmission request and no retransmission data of TrCH3 after transmitting the transmission data of TrCHl and TrCH2, the allowable maximum When the transmission rate of each channel that can be transmitted at a transmission power equal to or less than the transmission power and a predetermined transmission power of the transmission power information is the total number of bits of TrCH1 to TrCH3, S400 bits, the MAC unit 107 sets the TrCH1 to TrCH3 to Total number of bits Select TFC = 2, TFC = 4, TFC = 6, and TFC = 7 as TFC that does not exceed 00 bits. As a result, as shown in FIG. 7, the MAC unit 107 changes TFC = 3 from “Supported state” to “Excess-power statej” indicating immediately before the transmission is prohibited (step ST701), and from “Excess-power state”. "Transition to Blocked statej (step ST702), TFC = 1, Tok = 3, and Tok = 5 indicate that transmission is prohibited." 8101½ (1 statej, TFC = 2, TFC = 4, “7 = 7” and “7 = 7” indicate transmission permission “3 01 ^ (1 statej) to set each TFC to the state shown in FIG. 9. Next, the MAC unit 107 selects the selected TFC = 2, TFC = 4, TFC = 6, and TFC = 7 are selected, and TFC = 6 having the largest number of bits of TrCH3 is selected.From this, MAC section 107 encodes 400 bits as transmission data of TrCH3. Output to 112. The transmission rate selection information in Fig. 6 is given a priority due to the difference between the first transmission and the retransmission, but it is also possible to provide a priority for each retransmission count. In the case of, by performing the processing described above, it is possible to set different transmission record over preparative every number of retransmissions.

[0066] There are roughly two ways of using HARQ. The first method is to lower the target BLER (block error rate) for the first transmission. This method basically allows data to pass on the first transmission. However, even if it is incorrect, the retransmission data is sent immediately. By determining whether to send the retransmission data in a low layer such as layer 1 or the like, the time until retransmission can be reduced. As a result, the delay can be reduced, and gain can be obtained in a delay-sensitive type application. one more It is used to increase the target BLER for the first transmission. This method allows data to pass through multiple times. By increasing the target BLER in the first transmission, the mobile station transmission power or the coding rate of the transmission data can be increased. Even in such a case, data communication is successful at a certain rate, and the mobile station transmission power can be reduced by returning an Ack signal to the transmitting side. As a result, the radio wave use efficiency can be improved, and the bit rate can be improved when the coding ratio is increased. In this way, the priorities at the time of the first transmission and retransmission and the priorities for each channel are variably set, and the target BLER is adjusted, so that more efficient system operation can be performed.

[0067] The communication system 400 and the communication terminal 100 described above are considered as an extension of the UMTS system (WCDMA system) in which the communication terminal is the transmission side, and may be EUDTCH (extended uplink DTCH scheme) or HSUPA (High It is applicable to Speed Uplink Packet Access (up-speed transmission method).

As described above, according to the present embodiment, the transmission rate of transmission data is variably set for each channel based on different priorities at the time of initial transmission and at the time of retransmission, or based on the number of retransmissions. Since retransmission control is performed using the HARQ method, transmission delay due to repeated retransmissions can be reduced, and efficient system operation can be performed. Further, according to the present embodiment, retransmission control is performed by HARQ based on scheduling based on the priority of each channel, so that more efficient system operation can be performed. Further, according to the present embodiment, the transmission rate can be made higher for a channel that transmits transmission data having a shorter allowable delay time such as audio data. Can be shortened. For example, in the case of voice data, the allowable delay time is short, and in the case of data, the priority in transmission is increased, so that retransmission of packet communication data other than voice data is inadvertently repeated. It is possible to prevent a situation in which the sound is interrupted on the receiving side due to uniform priority given to the transmission of retransmission data. Further, for example, a channel for transmitting transmission data having a long allowable delay time, such as FTP, can transmit data with sufficient time for the system, so that the efficiency of the system can be increased. Also, the first transmission When the priorities are set in two cases, that is, when transmitting and when retransmitting, it is possible to simplify the process of determining the priorities when the communication terminal device sets the transmission rate. If a different transmission rate is set for each retransmission, efficient operation can be performed in the entire system to which the retransmission method is applied.

In the above embodiment, the transmission data of TrCH1 is used as voice data, the transmission data of TrCH2 is used as streaming type packet communication data, and the transmission data of TrCH3 is used as WWW access type packet communication. Power as data Not limited to this, priorities can be set as needed for any type of data. Also, in the present embodiment, the power applied to the CDMA system is not limited to this, and the present invention can be applied to any system other than the CDMA system. Also, in the present embodiment, the power of using HARQ as the retransmission method is not limited to this, and any retransmission method other than HARQ can be applied. Further, in the present embodiment, the priority information for each channel and the priority information at the time of initial transmission or retransmission are stored as one transmission rate selection information. However, the present invention is not limited to this. The information on the priority for each channel and the information on the priority at the time of initial transmission or retransmission may be divided and stored as different information. Further, in the present embodiment, the priority is set for each channel. However, the present invention is not limited to this, and the priority may be set for the first transmission and the retransmission without setting the priority for each channel, or may be set for each retransmission count. Priorities may be set.

[0070] The present specification is based on Japanese Patent Application No. 2004-128579 filed on April 23, 2004. All this content is included here.

Industrial applicability

The communication terminal device and the transmission method according to the present invention have an effect of reducing transmission delay and performing efficient system operation in a system transmitting a plurality of channels. Useful.

Claims

The scope of the claims

[1] Transmission of retransmission data at the time of the first transmission and retransmission data at the time of the retransmission for correcting an error of the transmission data at a communication partner based on a priority order at the time of the first transmission and the retransmission. Transmission rate setting means for variably setting a rate for each channel; synthesizing for synthesizing the transmission data or the retransmission data at the transmission rate set by the transmission rate setting means between channels to generate synthetic transmission data A communication terminal device comprising: a transmitting unit that transmits the combined transmission data generated by the combining unit.

2. The communication terminal device according to claim 1, wherein the transmission rate setting means variably sets a transmission rate of the transmission data or the retransmission data of each channel based on a priority order for each channel.

[3] The transmission rate setting means sets a plurality of transmission rates for each channel, selects one of the set transmission rates for each channel, and stores transmission rate information which is information of a transmission rate combined with each other. A combination of transmission rates such that a channel having a lower priority has a lower transmission rate with reference to the transmission rate information using priority information for each channel notified from the communication partner. 3. The communication terminal device according to claim 2, wherein a transmission rate is set by selecting a communication terminal.

[4] The communication terminal device according to claim 2, wherein the transmission rate setting means sets the transmission rate on the assumption that the permissible delay time is short!

[5] The transmission rate setting means includes a table storing transmission rate selection information in which the first transmission and the retransmission and the priority are associated with each other, and the retransmission data is added to the combined transmission data. Using the information on whether or not power is included, referring to the transmission rate selection information, the transmission data at the time of the first transmission having the lower priority or the retransmission data at the time of the retransmission is transmitted more. 2. The communication terminal device according to claim 1, wherein the transmission rate is set so that the rate is reduced.

6. The communication terminal device according to claim 1, wherein the transmission rate setting means sets a different transmission rate for the retransmission data for each retransmission.

[7] A base station apparatus for receiving the combined transmission data transmitted from the communication terminal apparatus according to claim 1,

The base station device,

Channel separation means for separating the combined transmission data into data of each channel based on information on the transmission rate of the transmission data or the retransmission data of each channel set by the transmission rate setting means;

Decoding means for performing error correction and decoding on the previously received data if the data separated by the channel separation means includes the retransmission data, using the retransmission data;

A base station device comprising:

[8] When setting a plurality of transmission rates for each channel, selecting one of the set transmission rates for each channel, and combining the transmission rate information with each other, and setting the transmission rate by the transmission rate setting means, Storage means comprising a table storing channel separation information which is the same information as the information to be referred to,

The channel separation unit uses the transmission rate information of each channel set by the transmission rate setting unit, which has been transmitted, to the channel separation information stored in the storage unit. 8. The base station apparatus according to claim 7, wherein the combined transmission data is separated into data of each channel by referring to the data.

[9] Transmission of the retransmission data at the time of retransmission for correcting an error of the transmission data at the time of the initial transmission or the error of the transmission data at a communication partner based on the priority order at the time of the first transmission and the time of retransmission. A transmission rate setting method that variably sets the rate for each channel.

[10] There is provided a table storing transmission rate selection information relating the first transmission and the retransmission at the same time as the priority, and uses information on whether or not to transmit retransmission data. The transmission rate is set so that the priority is low with reference to the transmission rate selection information, and the transmission rate is lower as the transmission data at the first transmission or the retransmission data at the retransmission. The transmission rate setting method described in 9.

[11] The transmission data at the time of the first transmission or the error at the time of the retransmission for correcting an error of the transmission data by a communication partner based on the priority order at the time of the first transmission and the time of the retransmission Setting the transmission rate of retransmission data variably for each channel; and generating combined transmission data by combining the transmission data or the retransmission data at the set transmission rate between channels;

Transmitting the generated combined transmission data;

A transmission method comprising:

12. The transmission method according to claim 11, wherein a transmission rate of the transmission data or the retransmission data of each channel is variably set based on a priority order for each channel.

[13] A table in which a plurality of transmission rates are set for each channel, transmission rate information that is information of transmission rates selected and combined for each of the set transmission rates is selected for each channel, and a table is stored. Referring to the transmission rate information using the notified priority information for each channel, the transmission rate is selected by selecting a combination of transmission rates such that the priority is lower and the transmission rate is lower for the channel. 13. The transmission method according to claim 12, wherein:

14. The transmission method according to claim 12, wherein the transmission rate is set such that a channel that transmits transmission data with a shorter allowable delay time has a higher priority.

[15] The apparatus further comprises a table storing transmission rate selection information relating the first transmission and the retransmission at the time of transmission and the priority, and determines whether or not the retransmission data is included in the combined transmission data. Using the information, the transmission rate is set with reference to the transmission rate selection information so that the transmission data at the time of the first transmission having the lower priority or the retransmission data at the time of the retransmission has a lower transmission rate. 12. The transmission method according to claim 11, wherein the transmission method is performed.

16. The transmission method according to claim 11, wherein a different transmission rate is set for each retransmission of the retransmission data.

[17] Transmission of the retransmission data at the time of the first transmission and the retransmission data at the time of the retransmission for correcting an error of the transmission data at a communication partner based on the priority order at the time of the first transmission and the retransmission. Setting the rate variably for each channel;

Combining the transmission data or the retransmission data at a set transmission rate between channels to generate combined transmission data; Transmitting the generated combined transmission data;

Receiving the combined transmission data;

A step of separating the combined transmission data into data of each channel based on information on the transmission rate of the transmission data or the retransmission data of each channel set on the transmission side;

When the retransmitted data is included in the separated data, performing error correction on the previously received data using the retransmitted data and decoding the data;

A communication method comprising: