WO2011120220A1 - Procédé et dispositif de décodage dans un réseau relais - Google Patents

Procédé et dispositif de décodage dans un réseau relais Download PDF

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Publication number
WO2011120220A1
WO2011120220A1 PCT/CN2010/071445 CN2010071445W WO2011120220A1 WO 2011120220 A1 WO2011120220 A1 WO 2011120220A1 CN 2010071445 W CN2010071445 W CN 2010071445W WO 2011120220 A1 WO2011120220 A1 WO 2011120220A1
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WIPO (PCT)
Prior art keywords
data
channel
aliased
packet
data packets
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Application number
PCT/CN2010/071445
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English (en)
Chinese (zh)
Inventor
李纪
胡中骥
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上海贝尔股份有限公司
阿尔卡特朗讯
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to PCT/CN2010/071445 priority Critical patent/WO2011120220A1/fr
Priority to CN201080062275.8A priority patent/CN102725986B/zh
Priority to TW100108572A priority patent/TW201218710A/zh
Publication of WO2011120220A1 publication Critical patent/WO2011120220A1/fr

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Classifications

    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0076—Distributed coding, e.g. network coding, involving channel coding
    • H04L1/0077—Cooperative coding

Definitions

  • the present invention relates to wireless relay communications, and more particularly to decoding in wireless relay communications. Background technique
  • relaying is an important technology for increasing capacity and improving coverage.
  • UE user equipment
  • eNB base station
  • the relay station usually also receives uplink data of each user equipment, and uses it as a secondary base station to decode uplink data of the user equipment.
  • the auxiliary information is forwarded to the base station.
  • the traditional relay mode is that the relay station RN forwards the uplink data of each user equipment one by one.
  • the user equipments UE1 and UE2 respectively transmit their uplink data packets P1 and P2 to the relay station RN and the base station eNB in the first time slot and the second time slot; the relay station RN is respectively in the third And receiving the received uplink data packets P1 and P2 from the user equipments UE1 and UE2 as auxiliary information to the base station eNB to assist the base station eNB in the first and second time slots.
  • the uplink data received from the user equipment UE1 and UE2 is decoded.
  • the relay station RN increases, one by one forwarding requires more and more time slots, which causes a long communication delay. In an FDD system, such problems are similar, requiring multiple spectrum resources.
  • the uplink time resource or spectrum is very valuable, and the power of the relay station is also very important, so the industry urgently needs a more efficient relay mode.
  • the applicant has proposed a method of relaying in the PCT/CN2009/000446 application, as shown in FIG. 2, taking the TDD system as an example, the user equipments UE1 and UE2 are respectively sent in the first time slot and the second time slot.
  • the uplink data packets P1 and P2 are given to the relay station RN and the base station eNB; the relay station RN performs a bitwise exclusive OR (or the same) on the received data packets P1 and P2 from the user equipment UE1 and UE2, and the obtained auxiliary information is obtained.
  • the third time slot is forwarded to the base station eNB to assist the base station eNB in decoding the upstream data packets P1 and P2 from the user equipment UE1 and UE2 received in the first and second time slots.
  • relay The station RN only occupies one time slot to provide auxiliary information, saving 50% of forwarding resources.
  • the uplink data is recovered based on the received uplink data from the user equipments UE1 and UE2 and the auxiliary information provided by the relay station RN using the soft combining decoder.
  • the performance improvement of the above proposed method is relatively slow. This means that the relay link is not being used very efficiently. Summary of the invention
  • the existing one-by-one forwarding mode occupies more uplink communication resources (time or spectrum).
  • the present invention needs to provide a communication technique that occupies less resources and can fully utilize the performance of the relay link.
  • a method for providing auxiliary information for assisting a receiver in decoding a plurality of received data packets in a relay station based on the LTE-A standard includes the following steps: receiving the plurality of data packets separately; performing aliasing between different data packets on the data in the multiple data packets, and the aliased data includes data in each data packet; performing the data after the aliasing Channel coding, wherein the channel coding step comprises performing data compression processing on the aliased data; and transmitting the channel-coded data as the auxiliary information to the receiver.
  • a method of decoding a plurality of data packets in a receiver based on the LTE-A standard wherein the receiver receives a copy of the plurality of data packets and according to The auxiliary information provided by the relay device according to the first aspect of the present invention for assisting the receiver to decode the plurality of data packets, the method comprising the steps of: decoding a received copy of each data packet; When at least one copy of the data packet cannot be correctly decoded, an estimation of the original data of each data packet is separately obtained; and an estimation of the original data of each data packet is performed between different data packets performed by the relay device to obtain the auxiliary information.
  • the aliasing corresponding to the aliasing performing data decompression corresponding to the data compression performed by the relay device on the received auxiliary information; based on the decompressed auxiliary information and the aliased data packet Estimation of the original data, performing joint channel decoding, obtaining original data of the aliased data packets; original of the aliased data packets
  • the data is subjected to anti-aliasing corresponding to aliasing between different data packets performed by the relay device to recover each data packet.
  • an apparatus for providing auxiliary information for assisting a receiver in decoding a received plurality of data packets in a relay station based on the LTE-A standard comprising: a receiving device, For respectively receiving the plurality of data packets; the aliasing device is configured to perform aliasing between the data packets in the plurality of data packets, and the aliased data includes data in each data packet; the channel encoder is used Channel-coding the aliased data, wherein the channel encoder includes a data compressor for performing data compression on the aliased data; and transmitting means for using the channel-encoded data as The auxiliary information is sent to the receiver.
  • an apparatus for decoding a plurality of data packets in a receiver based on an LTE-A standard wherein the receiver receives a copy of the plurality of data packets and according to
  • the apparatus according to the third aspect of the present invention provides auxiliary information for assisting the receiver to decode the plurality of data packets, the device comprising: a decoder, configured to decode a copy of each received data packet, And when the copy of the at least one data packet cannot be correctly decoded, respectively obtaining an estimate of the original data of each data packet; the aliaser for performing the estimation of the original data of each data packet with the third according to the present invention
  • the device of the aspect obtains the aliasing corresponding to the aliasing between the data packets performed by the auxiliary information; and the decompressor is configured to perform the auxiliary information received by the device according to the third aspect of the present invention.
  • the data compression is used in the channel encoder to reduce the amount of data of the auxiliary information, and by adjusting the compression ratio of the data compression, a corresponding proportion of uplink communication resources can be saved. Moreover, the receiving end can better recover the original auxiliary information through the channel decoder. At the same time, the above aspect maintains the amount of data packet information in the auxiliary information, so that the receiving end can better decode the data packet based on the data packet received by the direct link in combination with the auxiliary information. Since the relay station can provide the auxiliary information with better signal quality by using the relay link, the turbo decoder can effectively combine the auxiliary information for decoding, so as the relay link is improved, the performance according to the embodiment of the present invention is improved. Big Upgrade.
  • the above data compression and decompression is implemented by a rate matcher and a rate dematcher already agreed in the current LTE standard.
  • most of the modules conform to the existing LTE system definition, and only need to increase the aliasing module between the data packets. The module does not perform multiplication/addition operations, so the complexity is small.
  • the data of at least one of the data packets is also inter-packet interleaved prior to the step of aliasing the plurality of data packets.
  • the data of at least one of the data packets is also deinterleaved.
  • this function can also be implemented by an interleaver already agreed in the LTE standard, without the need to add additional functional modules.
  • the aliased data is divided into a plurality of data blocks whose length is not greater than the maximum length. Then, a plurality of data blocks are encoded; after the decoder decodes the plurality of coding blocks at the receiver to obtain a plurality of data blocks, each data block is connected in series.
  • the technical problem that the data length after aliasing is larger than the maximum length allowed by the encoder is solved.
  • FIG. 1 is a schematic diagram of relaying of a relay station RN in the existing LTE-A standard
  • FIG. 2 is a schematic diagram of a new relay station RN for relaying proposed by the applicant
  • FIG. 4 is a relay station of an embodiment of the present invention. Schematic diagram of the workflow of the front end;
  • FIG. 5 is a schematic diagram of an apparatus for providing auxiliary information for decoding an received plurality of data packets by an auxiliary receiver in a relay station according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram showing a workflow of a front end of a base station according to an embodiment of the present invention
  • 7 is a schematic diagram of an apparatus for decoding a plurality of data packets in a base station according to an embodiment of the present invention
  • Figure 8 is a simulation diagram for comparing performances according to embodiments of the present invention and prior art
  • Fig. 9 is a simulation diagram for comparing performances according to an embodiment of the present invention and another prior art.
  • the user equipments UE1 and UE2 transmit their uplink data packets P1 and P2 to the relay station RN and the base station eNB in the first time slot and the second time slot, respectively.
  • the two data packets can also be sent by one user equipment.
  • the present invention can be applied to the case of two or more data packets (or two or more users) and to the case of two or more relays. The same applies to the FDD system.
  • the receiving device calculates the symbol maximum likelihood ratio sequence LLRs1 of the TBI, and then calculates the bit maximum likelihood ratio sequence LLRM, and then passes through the channel. After decoding, it is restored to data bits; similarly, the receiving device also restores TB2 corresponding to packet P2 to data bits.
  • a two-way process is used—depicting the data packets P1 and P2. It can be understood that the symbol maximum likelihood ratio calculation, the bit maximum likelihood ratio calculation, and the bit maximum likelihood ratio calculation of the data packets P1 and P2 are processed.
  • the channel decoders can be the same set of units.
  • the channel decoder may also include a channel deinterleaver, a rate dematcher, a subblock deinterleaver, a code block concatenation device, and a CRC (Cyclic Redundancy Coding) detection device. This process is well known to those skilled in the art.
  • a 1/3 encoding rate, a packet length of 3456 bits, and QPSK modulation are taken as an example.
  • the 3432-bit data packets P1 and P2 are respectively re-encoded by the CRC, and the CRC check bit is added, and the length becomes 3456 bits.
  • the data packets P1 and P2 are respectively interleaved in the packet.
  • This function can be performed by the data interleaving module in the relay station. Interleaving generally involves only the shifting of data, and does not involve adding or multiplying the data, so the computational complexity is low. It can be understood that only one data packet can be inter-frame interleaved. In another embodiment, no intra-packet interleaving is performed on any one of the packets.
  • the aliaser performs aliasing between the different packets in the packets P1 and P2, and the aliased data includes the data in the packets P1 and P2.
  • the data interleaving module in the relay station is used to interleave the data in the data packets P1 and P2 on a bit-by-bit or bit-by-bit basis. Interleaving generally involves only data shifting, and does not involve data. Addition or multiplication, so the computational complexity is very low.
  • the data in packets P1 and P2 are directly concatenated in series. The data length after aliasing is 6912 bits.
  • the aliased data is treated by the backend function module as a normal TB, so it is then compatible with existing backend functional modules.
  • the code block divider divides the aliased data into two data blocks of lengths of 3456 and 3520 bits, respectively. It can be understood that the code block divider can be omitted if the length of the aliased data is less than or equal to the maximum length.
  • the Turbo encoder performs Turbo coding with a coding rate of 1/3 for the two divided data blocks, and obtains two auxiliary code blocks having lengths of 10380 bits and 10572 bits, respectively.
  • the sub-block interleaver performs sub-block interleaving on the turbo coded auxiliary code block.
  • the rate matcher then performs rate matching on the sub-block interleaved auxiliary code blocks.
  • the coding rate is 2/3 and the compression ratio is 50%.
  • Two auxiliary code blocks with a total length of 10380 bits are obtained, which are denoted as J C CB 1 and JNC CB2.
  • Other compression ratios may also be employed. This embodiment uses the same compression ratio as the XOR scheme to compare the performance available when using the same forwarding resources.
  • the auxiliary code block is further interleaved by the channel interleaver.
  • the transmitting device for example, the modulator modulates the auxiliary code block into a complex signal sequence having a length of 5190 symbols, and transmits the signal to the base station eNB in the third time slot or the fourth time slot, the complex signal
  • the sequence is denoted as P_j NC .
  • the first time slot and the second time slot of the base station eNB respectively calculate the symbol maximum likelihood ratio sequence LLRs1, and then calculate the bit thereof.
  • Maximum likelihood ratio sequence LLRbl Thereafter, channel deinterleaving, rate matching, and sub-block deinterleaving are performed separately to obtain a copy of the encoded data packets P1 and P2.
  • the base station eNB After receiving the complex signal Pj NC including the auxiliary code block, the base station eNB calculates its symbol maximum likelihood ratio sequence and then calculates its bit maximum likelihood ratio sequence. Then, channel deinterleaving is performed separately, and the compressed auxiliary code block is decompressed by rate de-matching, and then sub-block deinterleaving is performed, and finally two auxiliary code blocks are obtained.
  • a copy of the encoded data packets P1 and P2 is provided to the Turbo decoder for decoding.
  • the decoded data of the two packets is output.
  • the Turbo decoder acquires the estimates Lai and La2 of the original data of the packets P1 and P2, respectively, as a priori information for decoding in the following processing.
  • the Turbo decoder is a conventional decoder that performs multiple (e.g., 15) cycles of decoding internally.
  • the decoding of the Turbo decoder and the techniques for obtaining an estimate of the original data in the data packet are well known to those of ordinary skill in the art and will not be described again.
  • the interleaver performs an interleaving of the original data of the at least one data packet corresponding to the intra-packet interleaving performed by the relay station RN to obtain the auxiliary information.
  • the relay station RN does not perform intra-packet interleaving, the interleaving at the base station eNB should be omitted.
  • the aliaser will perform aliasing for each of the estimated Las corresponding to the aliasing between different packets made by the relay station to obtain the auxiliary information. For example, in the case where the relay station RN interleaves the data in the packets P1 and P2 bit by bit or bit by bit, the data aliasing also interleaves the estimated Lai and La2 in a bitwise or bit by bit manner.
  • the code block splitter divides the aliased estimate of the original data of each data packet into multiple The estimated data blocks La CB1 and La CB2 are each not longer than the maximum length. It should be noted that the code block splitter performs CRC calculation on the divided binary data block by default, and adds a CRC check bit after each data block; Since the estimate of the original data generated by the Turbo decoder is a real value that has not been hard-decided, the code block splitter should be set to not perform the CRC calculation, and the CRC check bit after each estimated data block is directly filled in. 0.
  • the obtained plurality of estimated data blocks La CB l and LaCB2 correspond to the received plurality of auxiliary code blocks JNC CB1 and JNC CB2.
  • the Turbo decoder performs joint channel decoding on each of the estimated data blocks La CB1 and La CB2 and the corresponding auxiliary code blocks JNC CB 1 and JNC CB2 to obtain respective data of the original data of each of the aliased data packets. Piece.
  • the code block reassembler concatenates the individual data blocks of the original data of the aliased data packets into the original data of the aliased data packets.
  • the de-aliasing performs the unaliasing of the original data of the aliased data packets corresponding to the inter-packet aliasing performed by the relay station RN, and separates the data belonging to the different data packets.
  • the deinterleaver performs deinterleaving on the at least one data packet that is de-aliased corresponding to the intra-packet interleaving performed by the relay station RN to recover each data packet. data.
  • the de-interlacing at the base station eNB should be omitted.
  • Applicants have used simulations to compare the performance of embodiments in accordance with the present invention with the performance of a relay technique proposed in the PCT/CN2009/000446 application.
  • JNC represents an embodiment according to the present invention
  • s-XOR represents soft XOR is the technology used in the existing XOR relay literature.
  • the channel condition used for the simulation is the Rayleigh channel.
  • the link quality of the access link (UE-RN) is 20 dB better than the direct link.
  • the Turbo code is 3456 bits long.
  • the modulation method is QPSK.
  • Turbo decoding is performed 15 times in the inner loop.
  • the dashed line represents a hard decision XOR
  • the long dash represents a soft decision XOR
  • the straight line represents an embodiment according to the present invention
  • the triangle line is 10 dB
  • the circle is 12.5 dB
  • the square is 15 dB.
  • the abscissa is the bit signal to noise ratio and the ordinate is the bit error rate. The lower the signal-to-noise ratio required to achieve a certain bit error rate (ie, the curve is close to the left), the better the communication performance.
  • soft-decision XOR uses information from the direct link and the relay link equally; when the quality of the three links is low, the merge can produce a better signal; but when there is only a relay chain When the road is improved, the reception performance is not improved much.
  • channel decoding is first performed on the signal of the direct link and then on the signal of the relay link.
  • the turbo decoder can effectively combine the auxiliary information for decoding, so with the relay chain.
  • Embodiments of the present invention are superior to soft combining techniques when the quality of the relay link is 10 dB better than the direct link. This can usually be guaranteed through careful network deployment. In the case where 12.5 dB can be guaranteed, the embodiment of the present invention can improve reception performance by 2.8 dB compared to soft combining XOR for a bit error rate of 10 - 3 ; compared with hard-combined XOR, the present invention The implementation can improve the reception performance by 5.7 dB.
  • the embodiment of the present invention can improve the reception performance by 5 dB compared to the soft combining XOR for the case where the bit error rate is 10 - 3 ; compared with the hard combining XOR, the embodiment of the present invention Can improve the receiving performance by 8.1dB.
  • Applicants also employ simulation means for performance and other embodiments in accordance with the present invention.
  • a prior art C. Hausl and P. Durpaz, Joint Network-Channel Coding for the Multiple-Access Relay Channel, Proc. International Workshop on Wireless Ad Hoc and Sensor Networks, New York, USA, June 2006
  • a single intra-cycle Turbo decoding is performed on the data packet replica to obtain an estimated data block, and a secondary estimated data block obtained by Turbo decoding of a single inner loop based on the estimated data block and the auxiliary code block is used. Looping multiple times (for example, 15 times) Turbo decoding of a single inner loop of the packet copy is performed using the sub-estimated data block obtained each time and the step is repeated.
  • the improved technique 1 is that the Turbo decoding inner loop is performed 3 times and the outer loop is performed 5 times; the improved technique 2 is that the Turbo inner loop is performed 5 times and the outer loop is performed 3 times; the embodiment of the present invention uses the usual Turbo decoder (inside) The cycle is performed 15 times), eliminating the need for an outer loop.
  • the total number of Turbo decodings for these four methods is the same.
  • the other simulation parameters are the same as the previous simulation. As shown in Figure 9, it can be seen that although the other prior art uses the estimated data block to decode the packet copy each time, it seems that it should have better performance, but the simulation results show that this The performance of an embodiment of the invention is superior to the other prior art.
  • the present invention uses a module compatible with the existing LTE system, particularly the Turbo decoder, to make a small change to the existing system, but to obtain better performance than the reference technology.
  • This reference technology requires a comprehensive modification of existing systems, especially Turbo decoders.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

Le système de relais conforme à l'état antérieur de la technique occupe de nombreuses ressources de communication de liaison montante et n'utilise pas assez les liaisons relais. Pour remédier à ce problème, la présente invention propose un procédé et un dispositif de décodage destinés à un réseau relais. Une station relais réalise un mélange entre paquets portant sur les données d'une pluralité de paquets de données, suivi d'un codage de canal, et il transmet les données codées à un récepteur afin que ces informations l'aident à effectuer le décodage, ce codage de canal comprenant un traitement des données par compression. Le récepteur obtient l'évaluation des données d'origine de chacun des paquets de données, et il réalise un mélange correspondant à la station relais ; ledit récepteur effectue également une décompression des données des informations d'aide au décodage reçues, puis il mène à bien, en fonction des informations d'aide décompressées et de l'évaluation mélangée des données d'origine de chaque paquet de données, un décodage de canal combiné qui lui permet d'obtenir les données d'origine mélangées de chaque paquet de données, et enfin il annule le mélange pour récupérer chaque paquet de données. Le mode de réalisation de la présente invention réduit l'occupation des ressources et augmente l'utilisation des liaisons relais.
PCT/CN2010/071445 2010-03-31 2010-03-31 Procédé et dispositif de décodage dans un réseau relais WO2011120220A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2010/071445 WO2011120220A1 (fr) 2010-03-31 2010-03-31 Procédé et dispositif de décodage dans un réseau relais
CN201080062275.8A CN102725986B (zh) 2010-03-31 2010-03-31 用于在中继网络中进行解码的方法和设备
TW100108572A TW201218710A (en) 2010-03-31 2011-03-14 Decoding method and device in relay network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2010/071445 WO2011120220A1 (fr) 2010-03-31 2010-03-31 Procédé et dispositif de décodage dans un réseau relais

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US10484146B2 (en) * 2017-03-23 2019-11-19 Qualcomm Incorporated Downlink retransmission under unreliable code block group (CBG) level ACK/NACK feedback
WO2019099319A1 (fr) * 2017-11-15 2019-05-23 Idac Holdings, Inc. Système de codage polaire
CN109245858B (zh) * 2018-09-25 2021-03-23 重庆邮电大学 一种基于译码转发的改进型联合网络-Turbo编码方法
CN115001560B (zh) * 2022-04-13 2023-05-12 华东师范大学 一种基于功率域非正交多址接入的星地融合中继网络传输方法

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CN101414865A (zh) * 2008-11-12 2009-04-22 东南大学 无线中继器辅助多用户接入系统的联合多用户发送方法
CN101420291A (zh) * 2008-12-08 2009-04-29 北京邮电大学 中继系统中网络与信道编码的联合译码方法
US20090287979A1 (en) * 2008-05-15 2009-11-19 Haifeng Wang System and method for relay coding

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US20090287979A1 (en) * 2008-05-15 2009-11-19 Haifeng Wang System and method for relay coding
CN101414865A (zh) * 2008-11-12 2009-04-22 东南大学 无线中继器辅助多用户接入系统的联合多用户发送方法
CN101420291A (zh) * 2008-12-08 2009-04-29 北京邮电大学 中继系统中网络与信道编码的联合译码方法

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