WO2010137272A1 - 基地局装置、端末装置、無線通信システム及び送信方法 - Google Patents
基地局装置、端末装置、無線通信システム及び送信方法 Download PDFInfo
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- WO2010137272A1 WO2010137272A1 PCT/JP2010/003438 JP2010003438W WO2010137272A1 WO 2010137272 A1 WO2010137272 A1 WO 2010137272A1 JP 2010003438 W JP2010003438 W JP 2010003438W WO 2010137272 A1 WO2010137272 A1 WO 2010137272A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0093—Point-to-multipoint
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
Definitions
- the present invention relates to a base station device, a terminal device, a wireless communication system, and a transmission method in an MBMS (Multimedia Broadcast and Multicast Service) system.
- MBMS Multimedia Broadcast and Multicast Service
- a base station device transmits information data such as multimedia broadcast and broadcast service to a plurality of terminal devices (hereinafter abbreviated as “terminals”). It is a two-multipoint transmission service.
- a base station allocates the same data block to the same radio resource and transmits it to a plurality of terminals. Therefore, unicast transmission is performed by assigning a plurality of data blocks to a plurality of radio resources by ptp (point-to-point). Compared to the above, there is a feature that the utilization efficiency of radio resources can be improved.
- MBMS is defined in the standardization organization 3GPP (3rd Generation Partnership Project).
- 3GPP 3rd Generation Partnership Project
- MBMS a method for transmitting the same data block from a single base station is called Single-cell transmission, and a method for transmitting from a plurality of base stations is called Multi-cell transmission.
- Non-Patent Document 1 stipulates that HARQ (Hybrid-Automatic-Repeat-reQuest) is applied as retransmission control in single-cell transmission MBMS, as in unicast.
- HARQ Hybrid-Automatic-Repeat-reQuest
- the terminal that has received the MBMS data block returns an ACK / NACK (ACKnowledgement / Negative ACKnowledgement) to the base station according to whether or not the data block has been correctly decoded.
- the base station retransmits the MBMS data block in which NACK is detected.
- Non-Patent Document 1 since a plurality of terminals individually return ACK / NACK, the utilization efficiency of uplink (uplink) radio resources decreases as the number of terminals increases.
- NACK increases, retransmissions occur frequently, and the utilization efficiency of Downlink radio resources decreases. For example, when the NACK frequency of the terminal receiving the MBMS service at the cell edge is high, it is retransmitted to all terminals receiving the service.
- Non-Patent Document 2 proposes the following ACK / NACK return method in order to solve the above-described problems of the prior art.
- ⁇ ACK is not returned, but is returned only for NACK using OOK modulation (On-Off keying).
- NACKs from multiple terminals are added to the same radio resource and transmitted to the base station.
- the base station receives the NACK added for a plurality of terminals, and determines whether or not retransmission is necessary according to the NACK. For example, the threshold of the NACK power is determined, and the presence or absence of retransmission is determined according to the threshold determination result.
- Minority NACK When the base station determines whether or not retransmission is necessary based on the threshold value determination result of NACK power obtained by adding a plurality of terminals, when only a small number of terminals are NACK, the data block that the terminal could not decode is not retransmitted (Hereinafter referred to as “Minority NACK”). NACK occurs probabilistically. Therefore, Minority NACK can occur in all terminals.
- Non-Patent Document 2 is a majority retransmission method, a data block that could not be decoded by the terminal is not retransmitted to the terminal in which the Minority NACK has occurred, and the service quality at the terminal is not retransmitted. Will fall.
- An object of the present invention is to provide a base station apparatus, a terminal apparatus, a radio communication system, and a transmission method capable of reducing a decrease in efficiency of downlink radio resources due to retransmission while giving a retransmission opportunity to all terminals notifying retransmission requests. Is to provide.
- the base station apparatus of the present invention is a base station apparatus that transmits multicarrier data and / or broadcast data to a plurality of terminal apparatuses simultaneously in units of data blocks, and receives retransmission request signals from the plurality of terminal apparatuses, respectively.
- the terminal device of the present invention receiving means for receiving a symbol sequence broadcast from a base station device in units of data blocks, slot separating means for separating multiple blocks arranged in a retransmission data slot from the symbol sequence, Block separation means for separating the multiplex block into a plurality of data blocks and outputting a retransmission data block; demodulation / decoding means for demodulating and decoding the retransmission data block and outputting decoded data; and error of the decoded data
- a configuration is adopted that includes error detection means for detecting presence / absence and transmission means for transmitting a retransmission request signal according to the error result.
- the wireless communication system of the present invention is a base station device that transmits multicarrier data and / or broadcast data to a plurality of terminal devices simultaneously in units of data blocks, and receives retransmission request signals from the plurality of terminal devices, respectively.
- Receiving means for receiving the received symbol sequence, and from the symbol sequence to the retransmission data slot Slot separating means for separating the multiplexed blocks, block separating means for separating the multiplexed blocks into a plurality of data blocks and outputting retransmission data blocks, and demodulating and decoding the retransmission data blocks to obtain decode
- the transmission method of the present invention is a transmission method for simultaneously transmitting multicarrier data and / or broadcast data to a plurality of terminal devices in units of data blocks, receiving a retransmission request signal from each of the plurality of terminal devices, and receiving In response to the retransmission request signal, the transmission data included in different data blocks are encoded and modulated to output a plurality of retransmission data blocks, and the plurality of retransmission data blocks are multiplexed to output a multiplexed block.
- the multiplex block is arranged in a retransmission time slot.
- the present invention it is possible to reduce the efficiency of downlink radio resources due to retransmission while giving a retransmission opportunity to all terminals that notify the retransmission request.
- FIG. 1 shows the principal part structure of the base station of the transmission side which concerns on Embodiment 1 of this invention.
- FIG. 1 shows the example of arrangement
- FIG. which shows the principal part structure of the base station of the transmission side which concerns on Embodiment 2 of this invention.
- FIG. 2 shows the principal part structure of arrangement
- FIG. 3 The figure which shows the principal part structure of the base station of the transmission side which concerns on Embodiment 3 of this invention.
- FIG. 3 The figure which shows the example of arrangement
- FIG. 1 shows a main configuration of transmitting-side base station 100 according to the present embodiment.
- the division unit 101 receives the transmission data and divides the transmission data into a plurality of blocks. Then, the dividing unit 101 outputs the obtained plurality of data blocks to the encoding / modulation unit 102 and the encoding / modulation unit 110.
- the encoding / modulating unit 102 includes an encoding unit 103 and a modulating unit 104, and the encoding unit 103 performs encoding processing on a data block output from the dividing unit 101 and including transmission data for initial transmission. I do. Also, the modulation unit 104 modulates the encoded data output from the encoding unit 103 to generate a first transmission data block. Then, modulation section 104 outputs the generated initial transmission data block to arrangement section 114.
- the radio reception unit 106 receives a control signal (feedback information) transmitted from a terminal on the receiving side via the antenna 105, performs reception processing such as down-conversion and A / D conversion on the control signal, and performs reception processing.
- the control signal subjected to is output to the demodulation unit 107.
- This control signal includes a response signal (ACK / NACK) fed back from the receiving terminal and a data block number.
- the response signal (ACK / NACK) is notified to base station 100 for each data block.
- Demodulation section 107 demodulates the control signal and outputs the demodulated control signal to retransmission request detection section 108.
- the retransmission request detection unit 108 detects a response signal (ACK / NACK) notified from each terminal for each data block from the control signal input from the demodulation unit 107. Then, retransmission request detection section 108 outputs the detected response signal and data block number information to retransmission control section 109.
- the retransmission control unit 109 controls retransmission of the data block based on the response signal and the data block number input from the retransmission request detection unit 108. Specifically, retransmission control section 109 outputs the data block number notified of NACK input from retransmission request detection section 108 to encoding / modulation section 110. Also, retransmission control section 109 outputs the number of data block numbers notified of NACK within a predetermined period as multiplexing number N to multiplexing section 113 and modulation section 115. Further, retransmission control section 109 outputs information on the data block number included in the multiplexed block to modulation section 115. In addition, when the retransmission control unit 109 arbitrarily sets a predetermined period for detecting the number of data block numbers notified of NACK, the retransmission control unit 109 outputs information on the predetermined period to the modulation unit 115.
- the encoding / modulating unit 110 includes an encoding unit 111 and a modulating unit 112, and the encoding unit 111 holds transmission data output from the dividing unit 101 for each data block and is notified from the retransmission control unit 109. Encoding processing is performed on transmission data included in the data block number. Also, the modulation unit 112 modulates the encoded data output from the encoding unit 111 to generate a retransmission data block. Then, modulation section 112 outputs the generated retransmission data block to multiplexing section 113.
- the multiplexing unit 113 multiplexes N retransmission data blocks based on the multiplexing number N input from the retransmission control unit 109 to generate a multiplexed block.
- the multiplexing unit 113 uses time division multiplexing, frequency division multiplexing, or code division multiplexing.
- the multiplexing unit 113 outputs the generated multiplexed block to the arrangement unit 114.
- Arranging section 114 arranges the first transmission data block and the multiplexed block in the time slot, and outputs the arranged first transmission data block and multiplexed block (symbol sequence) to data / control signal multiplexing section 116. Specifically, arrangement section 114 provides retransmission time slots at predetermined intervals, and arranges multiple blocks in the retransmission time slots. The predetermined period is set based on a predetermined period in which the above-described retransmission control unit 109 detects the number of data block numbers notified of NACK. The arrangement method in the arrangement unit 114 will be described later. Arrangement section 114 outputs the arranged symbol series to data / control signal multiplexing section 116.
- Modulation section 115 modulates control information including multiplexing number N, information on data block numbers included in the multiplexed block, and information on a period in which a retransmission time slot is provided, and the modulated control information is converted into a data / control signal.
- the data is output to the multiplexing unit 116.
- the data / control signal multiplexing unit 116 multiplexes the symbol sequence (initial transmission data block and multiplexing block) arranged in each time slot and the control information input from the modulation unit 115 in the arrangement unit 114, and multiplexes them.
- the later signal is output to the wireless transmission unit 117.
- the radio transmission unit 117 performs transmission processing such as D / A conversion, amplification, and up-conversion on the signal input from the data / control signal multiplexing unit 116, and receives the signal subjected to the transmission processing via the antenna 105. To the other terminal.
- FIG. 2 shows a main configuration of receiving-side terminal 200 according to the present embodiment.
- the radio reception unit 202 receives a signal transmitted from the base station 100 on the transmission side via the antenna 201, and performs reception processing such as down-conversion and A / D conversion on the signal. Radio reception section 202 then outputs the signal after reception processing to multiplexed information detection section 203 and time slot separation section 204.
- the multiplex information detection unit 203 extracts information on the multiplex number N of retransmission data blocks multiplexed in the multiplex block from the received signal, and multiplexes information on the extracted multiplex number N and the data block number of the retransmission data block.
- the data is output to the block separation unit 206.
- the multiplexed information detection unit 203 outputs information on the detected period in which the retransmission time slot is provided to the time slot separation unit 204. .
- the time slot separation unit 204 separates the first transmission data block arranged in the first transmission time slot and the multiplexed block arranged in the retransmission time slot from the signal after reception processing. Time slot separation section 204 then outputs the initial transmission data block to demodulation section 205 and outputs the retransmission data block to multiplex block separation section 206.
- Demodulation section 205 demodulates the initial transmission data block input from time slot separation section 204 and outputs the demodulated data block to decoding section 208.
- Multiplex block separation section 206 extracts a data block number detected as having an error from a control signal input from error detection section 209, which will be described later, and is detected as having an error among the separated retransmission data blocks.
- the retransmission data block corresponding to the data block number is output to demodulation section 207.
- Demodulation section 207 demodulates the data block for retransmission input from multiplex block separation section 206, that is, the data block previously detected as having an error in error detection section 209, and decodes the demodulated data block 208. Output to.
- the decoding unit 208 decodes the data blocks input from the demodulation unit 205 and the demodulation unit 207, respectively.
- the decoding unit 208 performs HARQ processing in units of data blocks, for example. That is, when decoding a data block, since the data block that was received last time and determined to have an error in the error detection unit 209 and the data block for retransmission received this time are combined and decoded, a coding gain is obtained. Can be improved.
- the decoding unit 208 outputs each decoded data block to the error detection unit 209.
- the error detection unit 209 performs error detection on the data block input from the decoding unit 208. Then, the error detection unit 209 generates a response signal for each data block according to the error detection result (with or without error). When the error detection result includes an error, the error detection unit 209 generates a response signal including NACK and the data block number of the data block in which the error is detected. On the other hand, when the error detection result is no error, the error detection unit 209 generates a response signal including ACK and the data block number of the data block in which no error is detected. Error detection section 209 outputs a control signal including NACK / ACK and data block number to multiplex block separation section 206 and modulation section 210.
- the modulation unit 210 modulates the control signal input from the error detection unit 209 and outputs the modulated control signal to the wireless transmission unit 211.
- the wireless transmission unit 211 performs transmission processing such as D / A conversion, amplification, and up-conversion on the control signal, and transmits the control signal subjected to the transmission processing to the transmission-side base station 100 via the antenna 201.
- FIG. 3 shows data block numbers (# 1 to # 6) arranged in each time slot (T1 to T8) and four terminals (UE: User Equipment, UE # 1 to UE # 4) for each data block.
- UE User Equipment
- time slots T1 to T3, T5 to T7 are time slots for initial transmission
- time slots T4 and T8 are retransmission time slots
- FIG. This is an example provided for each slot.
- the retransmission control unit 109 sets the number of data block numbers for which NACK is notified in three time slots as a predetermined period as the multiplexing number N.
- NACK is notified from the UEs # 2, # 3, and # 4 to the data block # 1 transmitted in the initial transmission time slot T1, and transmitted in the initial transmission time slot T2.
- NACK is notified from UE # 4 to data block # 2 and ACK is notified from all UEs # 1 to # 4 to data block # 3 transmitted in the first transmission time slot T3.
- the retransmission control unit 109 sets the multiplexing number N to 2 and outputs the multiplexing number 2 to the multiplexing unit 113.
- the multiplexing unit 113 multiplexes the data blocks # 1 and # 2 to generate a multiplexed block, and the arranging unit 114 provides a retransmission time slot in the time slot T4, and arranges the multiplexed block in the time slot T4.
- the multiplex block arranged in the time slot T4 is an example in which the retransmission data blocks of the data blocks # 1 and # 2 are frequency-multiplexed in the multiplexing unit 113, and is arranged in the time slot T8.
- the multiplexed block is an example in which the data block for retransmission of data blocks # 4, # 5, and # 6 is frequency-multiplexed by the multiplexing unit 113.
- time slot arrangement pattern is not limited to that shown in FIG. 3, and it is sufficient that the retransmission time slots are provided periodically.
- base station 100 When 200 knows the time slot arrangement pattern in advance, base station 100 only needs to notify terminal 200 of the number N of multiplexed blocks arranged in the retransmission time slot.
- retransmission control section 109 determines the coding rate and modulation level for generating retransmission data blocks according to the number of multiplexing N in multiplexing section 113, and encodes and modulates the determined coding rate and modulation level.
- the data may be output to the unit 110. For example, in the example shown in FIG. 3, since the number of data blocks for retransmission multiplexed in time slot T4 is 2, retransmission control section 109 uses data block # 1 so that frequency resources are allocated by 1/2. The coding rate and modulation level of data block # 2 are determined. This makes it possible to generate multiple blocks while effectively using frequency resources that can be used in retransmission time slots.
- the retransmission control unit 109 increases the transmission data of a data block having a larger number of NACK notifications among multiplexed data blocks, that is, transmission data of a data block having a larger number of NACK notifications from different terminals.
- the ratio of radio resources to be allocated may be increased. For example, when NACK is notified from three UEs (# 2, # 3, # 4) to data block # 1, and NACK is notified from one UE (# 4) to data block # 2, Of the radio resources in the retransmission time slot, the ratio of radio resources allocated to data block # 1 is made larger than the ratio of radio resources allocated to data block # 2 (see FIG. 4).
- a data block with a large number of retransmission requests can improve a coding gain or a modulation gain of a data block with a large number of retransmission requests by allocating more radio resources in a retransmission time slot.
- the notification of the request can be suppressed.
- the retransmission control unit 109 transmits the transmission data of the data block having a larger number of NACK notifications among the multiplexed data blocks, that is, the transmission data of the data block having a larger number of NACK notifications from different terminals.
- the coding rate or the modulation level may be lowered.
- the retransmission data block may be frequency-multiplexed, the retransmission data block may be time-multiplexed as shown in FIG. Code multiplexing may be used.
- retransmission time slots are provided at predetermined intervals, and data blocks to which NACK is fed back are multiplexed and arranged in the retransmission time slot.
- a retransmission time slot is provided, and M data blocks to which NACK is fed back are multiplexed and retransmitted. Place in the time slot.
- FIG. 6 shows the main configuration of the transmitting-side base station according to the present embodiment.
- the base station 100A in FIG. 6 differs from the base station 100 in FIG. 1 in place of the retransmission control unit 109, the multiplexing unit 113, the arrangement unit 114, and the modulation unit 115, instead of the retransmission control unit 109A, the multiplexing unit 113A, and the arrangement unit 114A.
- a modulation unit 115A instead of the retransmission control unit 109A, the multiplexing unit 113A, and the arrangement unit 114A.
- the retransmission control unit 109A controls retransmission of the data block based on the response signal and the data block number input from the retransmission request detection unit 108. Specifically, retransmission control section 109A outputs the data block number notified of NACK input from retransmission request detection section 108 to encoding / modulation section 110. Further, retransmission control section 109A counts the number of different data block numbers notified of NACK, and when the number of different data block numbers notified of NACK reaches a predetermined number M, the different NACK notified A control signal notifying that the number of data block numbers has reached a predetermined number M is output to multiplexing section 113A, arrangement section 114A, and modulation section 115A. When base station 100A arbitrarily sets a predetermined number M, retransmission control section 109A outputs information about predetermined number M to modulating section 115A.
- multiplexing section 113A When receiving a control signal from retransmission control section 109A, multiplexing section 113A multiplexes M data blocks for retransmission and generates a multiplexed block.
- the multiplexing unit 113A uses time division multiplexing, frequency division multiplexing, or code division multiplexing.
- the multiplexing unit 113A outputs the generated multiplexed block to the arrangement unit 114A.
- the placement unit 114A places the first transmission data block and the multiplexed block in the time slot, and outputs the first transmission data block and the multiplexed block after placement to the data / control signal multiplexing unit 116.
- the arrangement unit 114A provides a retransmission time slot when the retransmission control unit 109A is notified of a control signal that indicates that the number of different block numbers notified of NACK has reached a predetermined number M. Then, multiple blocks are arranged in the retransmission time slot.
- the arrangement method in the arrangement unit 114A will be described later.
- Modulation section 115A modulates control information including data block number information and retransmission time slot position information included in the multiplexed block, and outputs the modulated control information to data / control signal multiplexing section 116. .
- the modulation unit 115A modulates the control information by including information on the predetermined number M.
- FIG. 7 shows the main configuration of the receiving terminal according to the present embodiment.
- the terminal 200A in FIG. 7 is different from the terminal 200 in FIG.
- a block separation unit 206A is provided.
- the multiplex information detection unit 203A detects the position of the retransmission time slot in which the multiplex block is arranged from the control information included in the received signal, and sends the detected information on the position of the retransmission time slot to the time slot separation unit 204A. Output. Further, when the information about the predetermined number M is included in the control information, the multiple information detection unit 203A outputs the information about the predetermined number M to the multiple block separation unit 206A.
- the time slot separation unit 204A uses the information on the position of the retransmission time slot notified from the multiplex information detection unit 203A, and the first transmission data block arranged in the first transmission time slot from the signal after reception processing, The multiple blocks arranged in the retransmission time slot are separated. Then, time slot separation section 204A outputs the initial transmission data block to demodulation section 205 and outputs the retransmission data block to multiplexed block separation section 206A.
- the multiplex block separation unit 206A is based on a predetermined multiplex number M in accordance with the multiplex method in the multiplex unit 113A of the base station 100A, with the multiplex block arranged in the retransmission time slot input from the time slot separation unit 204A. Then, it is divided into M retransmission data blocks. Multiplex separation section 206A outputs the separated retransmission data block to demodulation section 207.
- FIG. 8 shows data blocks arranged in each time slot (T1 to T8) and responses notified from four terminals (UE # 1 to UE # 4) to each data block number (# 1 to # 6). An example of correspondence with signals is shown.
- the arrangement unit 114A provides a retransmission time slot when the number of different blocks notified of NACK reaches a predetermined number M.
- time slots T1, T2, T4 to T6, and T8 are time slots for initial transmission
- time slots T3 and T7 are retransmission time slots
- FIG. This is an example provided when the number of different blocks notified of NACK is two.
- NACK is notified from the UEs # 2, # 3, and # 4 to the first transmission data block # 1 transmitted in the time slot T1, and the initial transmission data block # 1 transmitted in the time slot T2.
- retransmission control section 109A sends a control signal notifying the multiplexing section 113A that the number of different data block numbers notified of the NACK has reached a predetermined number of two. Output.
- the multiplexing unit 113A multiplexes the data blocks # 1 and # 2 to generate a multiplexed block, and the arranging unit 114A provides a retransmission time slot in the time slot T3, and arranges the multiplexed block in the time slot T3.
- arrangement section 114A provides a retransmission time slot when the number of different blocks notified of NACK reaches a predetermined number M, and multiplexes the data block to which NACK is fed back. Then, they are collectively arranged in the retransmission time slot. As a result, retransmission can be guaranteed for all terminals that have fed back the NACK, that is, in the example of FIG. 8, UE # 2 to UE # 4. Further, since the retransmission data block is multiplexed and arranged in one time slot, it is possible to reduce the loss of frequency efficiency of downlink radio resources due to retransmission.
- the radio resources in the retransmission data block are divided into a large number and the radio resources allocated to each retransmission data block It is possible to avoid an extremely small amount of resources and to secure appropriate radio resources for the retransmission data block.
- the multiplexing number of the data block for retransmission is not limited to two, and the base station 100A and the terminal 200A know in advance, or the base station 100A may notify the terminal 200A of the multiplexing number M.
- FIG. 9 shows a main configuration of base station 300 on the transmission side according to the present embodiment.
- the base station 300 of FIG. 9 includes a retransmission control unit 302 and a modulation unit 303 instead of the retransmission control unit 109 and the modulation unit 115 with respect to the base station 100 of FIG. 1, and a CQI (Channel Quality Indicator) extraction unit 301. Adopted a configuration with added.
- CQI Channel Quality Indicator
- the CQI extraction unit 301 extracts communication quality information (CQI) of each terminal from the demodulated control signal, and outputs the extracted CQI information to the retransmission control unit 302.
- CQI communication quality information
- the retransmission control unit 302 controls retransmission of the data block based on the response signal and the data block number input from the retransmission request detection unit 108. Further, the retransmission control unit 302 has a good communication quality of the data block for retransmission of the data block notified of the NACK based on the communication quality information (CQI) of the terminal notified of the NACK.
- CQI communication quality information
- a coding rate for generating the retransmission data block, a modulation level, and a radio resource to which the retransmission data block is allocated are determined so as to be allocated to the radio resource.
- the retransmission control unit 302 outputs information on the determined coding rate and modulation level to the coding / modulation unit 110, and outputs information on radio resources to which retransmission data blocks are allocated to the multiplexing unit 113 and the modulation unit 303.
- the modulation unit 303 includes information on radio resources to which retransmission data blocks are allocated, and modulates the control information.
- FIG. 10 shows a main configuration of a transmitting terminal according to the present embodiment.
- the same reference numerals as those in FIG. Terminal 400 in FIG. 10 has a configuration in which modulation section 402 is provided instead of modulation section 210 and propagation path state detection section 401 is added to terminal 200 in FIG.
- the propagation path state detection unit 401 detects the state of the propagation path using the reference signal transmitted from the base station 300, and outputs the detected state of the propagation path to the modulation unit 402 as communication quality information (CQI). .
- CQI communication quality information
- Modulation section 402 modulates the control signal input from error detection section 209 and the communication quality information (CQI) input from propagation path state detection section 401, and outputs the modulated control signal to radio transmission section 211.
- CQI communication quality information
- FIG. 11 shows data blocks arranged in each time slot (T1 to T8) and responses notified from four terminals (UE # 1 to UE # 4) to each data block number (# 1 to # 6). An example of correspondence with signals is shown.
- time slots T1 to T3, T5 to T7 are time slots for initial transmission
- time slots T4 and T8 are time slots for retransmission
- FIG. 10 is for retransmission as in FIG. This is an example in which time slots are provided at predetermined intervals every four time slots.
- NACK is notified from the UEs # 2, # 3, and # 4 to the data block # 1 transmitted in the initial transmission time slot T1, and transmitted in the initial transmission time slot T2.
- NACK is notified from the UE # 4 to the data block # 2 to be transmitted, and ACK is notified from all the UEs # 1 to # 4 to the data block # 3 transmitted in the initial transmission time slot T3.
- the retransmission control unit 302 determines the data block for retransmission of the data block notified of the NACK as the NACK.
- the coding rate for generating the retransmission data block, the modulation level, and the radio resource to which the retransmission data block is allocated are determined so as to allocate to the radio resource with good communication quality of the returned terminal.
- the retransmission control unit 302 assigns data block # 1 to the low frequency region of the radio resource of the retransmission time slot, and assigns data block # 2 Allocation is performed in a high frequency region (see FIG. 11), and information on radio resources to which retransmission data blocks are allocated is output to multiplexing section 113.
- retransmission control section 302 assigns data block # 5 to the middle frequency region of the radio resources of the retransmission time slot, and data block # 6 has the frequency
- the information is assigned to the low region, the remaining data block # 4 is assigned to the high frequency region (see FIG. 11), and information on the radio resource to which the retransmission data block is assigned is output to the multiplexing unit 113.
- the transmission data of a data block with a larger number of NACK notifications among multiplexed data blocks for retransmission that is, a data block with a larger number of NACK notifications from different terminals.
- retransmission control section 302 determines radio resources to which retransmission data blocks are allocated based on the communication quality of the terminal that has notified the retransmission request.
- the multiplexing unit 113 can allocate the retransmission data block to the radio resource with good communication quality of the terminal that has notified the retransmission request, and therefore can suppress the notification of the retransmission request again. Retransmission efficiency can be improved.
- the method of assigning radio resources to retransmission data blocks arranged in a multiplexed manner in the retransmission time slot described in the first embodiment has been described.
- the retransmission resource described in the second embodiment has been described.
- the radio resource allocation method described in the present embodiment can also be applied to retransmission data blocks that are multiplexed in time slots.
- the data block indicates a unit of encoding and decoding
- “data block” may be read as “Transport block”, “Code word”, “packet”, and the like.
- time slot indicates a transmission time unit, and “time slot” may be read as “Subframe”, “Frame”, or the like.
- the present invention is useful for a base station apparatus, a terminal apparatus, a wireless communication system, a transmission method, and the like in an MBMS system.
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Abstract
Description
図1に本実施の形態に係る送信側の基地局100の要部構成を示す。
実施の形態1では、再送用タイムスロットを所定の周期毎に設け、NACKがフィードバックされたデータブロックを多重してまとめて当該再送用タイムスロットに配置した。
本実施の形態では、再送用タイムスロットに多重して配置される再送用データブロックへの無線リソースの割り当て方法について説明する。
101 分割部
102,110 符号化・変調部
103,111 符号化部
104,112,115,115A,210,303,402 変調部
106,202 無線受信部
105,201 アンテナ
107,205,207 復調部
108 再送要求検出部
109,109A,302 再送制御部
113,113A 多重部
114,114A 配置部
116 データ・制御信号多重部
117,211 無線送信部
200,200A,400 端末
203,203A 多重情報検出部
204,204A タイムスロット分離部
206,206A 多重ブロック分離部
208 復号部
209 誤り検出部
Claims (10)
- マルチキャリアデータ及び/又はブロードキャストデータをデータブロック単位で複数の端末装置に一斉に送信する基地局装置であって、
前記複数の端末装置からそれぞれ再送要求信号を受信する受信手段と、
受信した前記再送要求信号に応じて、互いに異なるデータブロックに含まれる送信データを符号化変調して複数の再送用データブロックを出力する符号化・変調手段と、
前記複数の再送用データブロックを多重して多重ブロックを出力する多重手段と、
前記多重ブロックを再送用タイムスロットに配置する配置手段と、
を具備する基地局装置。 - 前記配置手段は、
前記再送用のタイムスロットを周期的に設ける、
請求項1に記載の基地局装置。 - 前記配置手段は、
前記再送要求信号が通知された異なるデータブロックの数が所定数になった場合に、前記再送用タイムスロットを設ける、
請求項1に記載の基地局装置。 - 前記多重手段は、
時分割多重、周波数分割多重、又は、符号分割多重を用いる、
請求項1に記載の基地局装置。 - 前記再送要求信号が通知されたデータブロックに含まれる送信データの符号化率及び変調レベルを決定する制御手段、を更に具備し、
前記符号化・変調手段は、決定された前記符号化率及び変調レベルを用いて前記再送用のデータブロックを出力する、
請求項1に記載の基地局装置。 - 前記制御手段は、
前記再送要求信号が通知された数が多いデータブロックの送信データほど、前記符号化率又は変調レベルを低くする、
請求項5に記載の基地局装置。 - 前記多重手段は、
前記再送要求信号を通知した前記端末装置の通信品質に基づいて、前記再送用のデータブロックを割り当てる無線リソースを決定する、
請求項1に記載の基地局装置。 - データブロック単位で基地局装置から一斉送信されたシンボル系列を受信する受信手段と、
前記シンボル系列から再送用データスロットに配置された多重ブロックを分離するスロット分離手段と、
前記多重ブロックを複数のデータブロックに分離して再送用データブロックを出力するブロック分離手段と、
前記再送用データブロックを復調復号して復号データを出力する復調・復号手段と、
前記復号データの誤り有無を検出する誤り検出手段と、
前記誤り結果に応じて再送要求信号を送信する送信手段と、
を具備する端末装置。 - マルチキャリアデータ及び/又はブロードキャストデータをデータブロック単位で複数の端末装置に一斉に送信する基地局装置であって、
前記複数の端末装置からそれぞれ再送要求信号を受信する受信手段と、
受信した前記再送要求信号に応じて、互いに異なるデータブロックに含まれる送信データを符号化変調して複数の再送用データブロックを出力する符号化・変調手段と、
前記複数の再送用データブロックを多重して多重ブロックを出力する多重手段と、
前記多重ブロックを再送用タイムスロットに配置する配置手段と、
を具備する前記基地局装置と、
データブロック単位で前記基地局装置から一斉送信されたシンボル系列を受信する受信手段と、
前記シンボル系列から前記再送用データスロットに配置された前記多重ブロックを分離するスロット分離手段と、
前記多重ブロックを複数のデータブロックに分離して再送用データブロックを出力するブロック分離手段と、
前記再送用データブロックを復調復号して復号データを出力する復調・復号手段と、
前記復号データの誤り有無を検出する誤り検出手段と、
前記誤り結果に応じて前記再送要求信号を送信する送信手段と、
を具備する端末装置と、
を備える無線通信システム。 - マルチキャリアデータ及び/又はブロードキャストデータをデータブロック単位で複数の端末装置に一斉に送信する送信方法であって、
前記複数の端末装置からそれぞれ再送要求信号を受信し、
受信した前記再送要求信号に応じて、互いに異なるデータブロックに含まれる送信データを符号化変調して複数の再送用データブロックを出力し、
前記複数の再送用データブロックを多重して多重ブロックを出力し、
前記多重ブロックを再送用タイムスロットに配置する、
送信方法。
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MX2011012336A MX2011012336A (es) | 2009-05-29 | 2010-05-21 | Dispositivo de estacion base, dispositivo de terminal, sistema de comunicacion inalambrica y metodo de transmision. |
US13/321,741 US20120063382A1 (en) | 2009-05-29 | 2010-05-21 | Base station device, terminal device, wireless communication system and transmission method |
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JP5948099B2 (ja) * | 2012-03-16 | 2016-07-06 | 株式会社Nttドコモ | 無線基地局、ユーザ端末、無線通信方法及び無線通信システム |
KR20140070987A (ko) * | 2012-12-03 | 2014-06-11 | 한국전자통신연구원 | 다중 대역을 이용하는 무선 링크 방법 및 시스템 |
WO2015103746A1 (en) * | 2014-01-08 | 2015-07-16 | Qualcomm Incorporated | Small mbsfn enhancement |
CN104780029B (zh) * | 2014-01-14 | 2019-02-19 | 华为技术有限公司 | 一种混合自动重传请求方法及相关装置 |
PL3621229T3 (pl) | 2017-02-06 | 2021-11-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Sposób częściowej retransmisji |
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JP2003244063A (ja) * | 2002-02-15 | 2003-08-29 | Matsushita Electric Ind Co Ltd | 基地局装置及びパケット伝送方法 |
JP2004104574A (ja) * | 2002-09-11 | 2004-04-02 | Mitsubishi Electric Corp | 再送制御方法および通信装置 |
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