WO2009088226A2 - Méthode de transmission de signaux utilisant le schéma harq pour garantir un gain de réarrangement de constellation - Google Patents

Méthode de transmission de signaux utilisant le schéma harq pour garantir un gain de réarrangement de constellation Download PDF

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Publication number
WO2009088226A2
WO2009088226A2 PCT/KR2009/000085 KR2009000085W WO2009088226A2 WO 2009088226 A2 WO2009088226 A2 WO 2009088226A2 KR 2009000085 W KR2009000085 W KR 2009000085W WO 2009088226 A2 WO2009088226 A2 WO 2009088226A2
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WO
WIPO (PCT)
Prior art keywords
block
scheme
code
code block
code blocks
Prior art date
Application number
PCT/KR2009/000085
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English (en)
Other versions
WO2009088226A3 (fr
Inventor
Bong Hoe Kim
Dong Youn Seo
Dae Won Lee
Ki Jun Kim
Original Assignee
Lg Electronics Inc.
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.)
Filing date
Publication date
Priority claimed from KR1020080135489A external-priority patent/KR101476203B1/ko
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to US12/811,372 priority Critical patent/US8537909B2/en
Publication of WO2009088226A2 publication Critical patent/WO2009088226A2/fr
Publication of WO2009088226A3 publication Critical patent/WO2009088226A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
    • 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
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0047—Decoding adapted to other signal detection operation
    • H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
    • 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
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0066—Parallel concatenated codes
    • 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
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy

Definitions

  • the present invention relates to a method for transmitting signals using a hybrid automatic repeat request (HARQ) scheme to guarantee a constellation rearrangement gain in a mobile communication system.
  • HARQ hybrid automatic repeat request
  • a forward error correction (FEC) code In order to enable a receiver to correct an error which occurs in a channel, information transmitted by a transmitter is transmitted after being coded using a forward error correction (FEC) code.
  • the receiver demodulates the received signal, decodes the FEC code, and restores transmitted information. In such a decoding process, the error of the received signal which occurs in the channel is corrected.
  • FEC codes may be used, for example, a turbo encoder will be described in the following description.
  • the turbo encoder is constituted by a recursive systematic convolution encoder and an interleaver.
  • an interleaver for facilitating parallel decoding such as quadratic polynomial permutation (QPP) interleaver
  • QPP interleaver has excellent performance in only a specific data block size.
  • the performance of the turbo encoder is improved as the size of the data block is increased.
  • a data block having a predetermined size or more is divided into several small data blocks and encoding is performed.
  • Each of the divided small data blocks is called a code block.
  • the code blocks generally have the same size. However, due to the limitation of the size of the QPP interleaver, one of the several code blocks may have a different size.
  • interleaving may be performed. In addition, the interleaved information is transmitted after being mapped to an actual radio resource.
  • rate matching is performed with respect to the encoded code blocks.
  • the rate matching is performed by puncturing or repetition.
  • the rate matching may be performed in the unit of encoded code blocks like the wideband code division multiplexing access
  • WCDMA 3 rd generation partnership project
  • the rate matching may be separately performed with respect to a systematic part and a parity part of each of the encoded code blocks. This is shown in FIG. 1.
  • FIG. 1 is a schematic view showing a process of encoding a code block, performing rate matching with respect to the encoded code block, and transmitting the code block.
  • each code block may be divided into a systematic bit stream and two parity bit streams by turbo encoding. These bit streams are subjected to sub-block interleaving and are then subjected to circular buffer rate matching.
  • FIG. 1 shows a method of dividing the code block into the systematic part and the parity part and performing sub-block interleaving. The interleaved information is transmitted in the unit of information having a predetermined size.
  • a hybrid automatic repeat request (HARQ) technology is obtained by combining channel coding and an ARQ technology, and improves decoding performance by retransmitting a data block in which an error occurs and combining the retransmitted data block and a previously transmitted data block.
  • the HARQ scheme may be classified according to regulations of a time point when a retransmission is performed, and may be classified into an asynchronous HARQ scheme in which the time point when the retransmission is performed is variable, and a synchronous HARQ scheme in which the time point when the retransmission is performed is fixed.
  • the HARQ scheme may be classified into a chase combining (CC) scheme and an incremental redundancy (IR) scheme according to types of a redundancy version (RV) used for the retransmission.
  • CC chase combining
  • IR incremental redundancy
  • a gain of a signal-to-noise ratio (SNR) is obtained by transmitting the same data block as a previous transmission.
  • SNR signal-to-noise ratio
  • a coding gain is obtained by transmitting data including a redundancy version different from that of a previous transmission.
  • the error performance of a specific bit location may be more excellent than that of another specific bit location.
  • a diversity gain is obtained and thus the error performance can be improved.
  • This scheme is called a constellation rearrangement scheme.
  • a constellation rearrangement gain can be mainly in the CC scheme, if a coding rate is low in the HARQ system using the IR scheme, many portions of the RVs overlap. Thus, even in this case, a gain can be obtained.
  • An object of the present invention devised to solve the problem lies on a method for transmitting signals to guarantee a constellation rearrangement gain having a predetermined level or more upon a retransmission in a mobile communication system for transmitting the signals using a HARQ scheme based on the above-described technology.
  • the object of the present invention can be achieved by providing a method for transmitting signals using a hybrid automatic repeat request (HARQ) scheme, the method including: encoding a first code block and a second code block having different sizes; performing sub-block interleaving with respect to each of the encoded first code block and second code block; and transmitting the sub-block interleaved first and second code blocks according to redundancy version (RV) start locations of the first code block and the second code block, wherein a first RV of the first code block and a second RV of the second code block have different start locations.
  • RV redundancy version
  • the first RV and the second RV may be set to be started from different RV start locations of a plurality of RV start locations which are equally defined with respect to the first code block and the second code block.
  • the start location of the second RV may be set by applying an offset having a predetermined size to the start location of the first RV.
  • the HARQ scheme may be an asynchronous HARQ scheme
  • the first RV and the second RV may be shared between a transmitter and a receiver by signaling.
  • the HARQ scheme is a synchronous HARQ scheme
  • the first RV and the second RV may -be previously decided between a transmitter and a receiver.
  • first RV of the first code block and the second RV of the second code block may be set such that constellation rearrangement gains having a predetermined threshold or more are acquired with respect to both the sub-block interleaved first and second code blocks.
  • first RV of the first code block and the second RV of the second code block may be set such that the order of bit streams modulated by an M-QAM (M>4) scheme is changed upon a retransmission with respect to both the sub-block interleaved first and second code blocks .
  • the first RV of the first code block and the second RV of the second code block may be set such that the order of bit streams modulated by a l ⁇ -QAM scheme is shifted by odd-numbered bits with respect to both the sub-block interleaved first and second code blocks.
  • a method for transmitting signals using a hybrid automatic repeat request (HARQ) scheme including: encoding predetermined code blocks; performing sub-block interleaving with respect to the encoded code blocks; and transmitting the sub-block interleaved code blocks according to redundancy version (RV) start locations of the sub-block interleaved code blocks, wherein the RVs are set such that the order of bit streams modulated by an M-QAM (M>4) scheme is changed upon a retransmission.
  • RV redundancy version
  • the RVs may be set such that the order of bit streams modulated by the 16-QAM scheme is shifted by odd-numbered bits with respect to the sub-block interleaved code blocks upon a retransmission.
  • FIG. 1 is a schematic view showing a process of encoding a code block, performing rate matching with respect to the encoded code block, and transmitting the code block.
  • FIG. 2 is a view showing a start point of each redundancy version (RV) in a system using a circular buffer rate matching.
  • FIG. 3 is a view showing a case where a constellation rearrangement gain cannot be acquired by a retransmission when symbol bits modulated by a l ⁇ -QAM scheme are transmitted after being subjected to rate matching using a circular buffer.
  • FIG. 4 is a view showing a case where RVs are set to guarantee a constellation rearrangement gain, according to an embodiment of the present invention.
  • FIG. 5 is a view showing a case where a constellation rearrangement gain acquired by any one code block cannot be acquired by a code block having a different size with respect to code blocks having different sizes, according to an embodiment of the present invention.
  • the present invention provides a method for transmitting signals to guarantee a constellation rearrangement gain having a predetermined level or more upon a retransmission in a mobile communication system for transmitting the signals using a HARQ scheme.
  • a method for acquiring the constellation rearrangement gain while transmitting symbol bits modulated an M-QAM (M>4) scheme or a HARQ scheme will be described in detail.
  • FIG. 2 is a view showing a start point of each redundancy version (RV) in a system using a circular buffer rate matching.
  • FIG. 2 shows a case where encoding is performed using a turbo encoder having a rate of 1/3 and the number of RVs is set to 4. Accordingly, a front 1/3 part is a systematic part and a rear 2/3 part is a parity part. The same principle is applicable even when the coding rate and the number of RVs are changed.
  • FIG. 2 it is assumed that the gap between the RVs is obtained by dividing the whole size of a circular buffer by the number of RVs.
  • RV start point or "RV start location” described herein may indicate the location of the circular buffer where information stored in the circular buffer is read as the information which will be transmitted according to the RV numbers upon an initial transmission and a retransmission.
  • RV transmission start point indicates the location where the signals to be transmitted according to RV numbers are read from the circular buffer.
  • One symbol modulated by the 16-QAM scheme may be represented by 4-bit information as described above.
  • the 4-bit information is sequentially represented by il, i2, ql and q2.
  • the location of one modulated symbol on a constellation may be decided by the 4-bit information.
  • I ⁇ -QAM symbol constellation bits may be represented as follows. Table 1
  • FIG. 3 is a view showing a case where a constellation rearrangement gain cannot be acquired by a retransmission when symbol bits modulated by a 16-QAM scheme are transmitted after being subjected to rate matching using a circular buffer.
  • FIG. 3 shows a case where, when the signals are read and transmitted from the circular buffer at four RV start points, all symbol bits modulated by the 16-QAM scheme are aligned in the same order and are transmitted. That is, when bit information corresponding to one modulated symbol is sequentially represented by il, ⁇ 2, ql and q2 in the system using the 16-QAM modulation scheme, the bits are arranged at all the RV start locations in the same order and thus the constellation rearrangement gain cannot be acquired.
  • the RV start locations are set such that the bit information order of the modulated symbols is changed to guarantee the constellation rearrangement gain having a predetermined level or more.
  • FIG. 4 is a view showing a case where RVs are set to guarantee a constellation rearrangement gain, according to an embodiment of the present invention.
  • bit streams corresponding to one 16- QAM modulated symbol are arranged in order of il, 12, ql and q2 and are transmitted at RV(O), and are arranged in order of i2, il, q2 and ql and are transmitted at RV(I), such that the location of the symbol on the constellation is changed upon a retransmission.
  • This may be set by adjusting each RV start location in consideration of the bit arrangement of the modulated symbol.
  • the RV start locations are set such that the bit streams corresponding to one modulated symbol are shifted by odd- numbered bits upon the retransmission.
  • the bit streams are shifted by odd-numbered bits and are transmitted, a location having good performance and a location having bad performance are changed on the constellation. Therefore, a higher constellation rearrangement gain can be acquired compared with the case where the bit streams are shifted by even-numbered bits and are transmitted.
  • the width A of the circular buffer is proportional to the size of the encoded codeword.
  • a null bit may be inserted into a lower end of the circular buffer as shown in FIG. 4. Accordingly, even when the width A of the circular buffer is a multiple of 4, the bit streams corresponding to the symbol modulated by the 16-QAM scheme may not be arranged in the same order at all the RV start locations.
  • a data block (an information block or a transport block) transmitted from an upper layer has a specific size or more due to the limitation of a physical layer, for example, the limitation of the size of a QPP interleaver
  • the data block may be divided into several code blocks.
  • WCDMA wideband code division multiple access
  • HSDPA high-speed downlink packet access
  • HSUPA high-speed uplink packet access
  • the sizes of the divided code blocks are identical.
  • the sizes of the code blocks may be different according to a wireless communication system due to various reasons such as the limitation of the interleaver size or the like.
  • FIG. 5 is a view showing a case where a constellation rearrangement gain acquired by any one code block cannot be acquired by a code block having a different size with respect to code blocks having different sizes, according to an embodiment of the present invention.
  • FIG. 5A shows a case where the RV start locations are set such that the modulated symbol bit arrangements are different with respect to the RV numbers in the system using the 16-QAM scheme as shown in FIG. 4. If the RVs are set as shown in FIG. 5A, the constellation rearrangement gain having a predetermined level or more can be acquired.
  • the constellation rearrangement gain cannot be acquired as shown in FIG. 5B. That is, with respect to a second code block having a second size different from a first size of a first code block applied like FIG. 5A, a degree that the order of symbol bit streams is changed according to RV start locations is decreased or the order of symbol bit streams may not be changed. In this case, since system performance is decided by a code block having a smallest constellation rearrangement gain, efficiency deteriorates.
  • the RV start locations are differently set according to the code blocks.
  • the following method is possible.
  • the offset may be applied to the start locations of RV(I), RV(2) and RV(3) such that the location in which the l ⁇ -QAM modulated symbol bit arrangement can be changed is set, a constellation rearrangement gain having a predetermined level or more can be acquired.
  • a method of applying the offset to the RV start locations by x bits with respect to the first code block and applying the offset to the RV start locations by y bits with respect to the second code block having the size different from that of the first code block is also possible.
  • the RV numbers may be applied to the code blocks having different sizes in different orders upon an initial transmission and a retransmission.
  • the constellation rearrangement gain having the predetermined level can be acquired if RV(I) is transmitted after RV(O) is transmitted with respect to the first code block
  • the constellation rearrangement gain is hard to be acquired if RV(I) is transmitted after RV(O) is transmitted with respect to the second code block having the size different from that of the first code block.
  • the constellation rearrangement gain is not acquired if RV(I) is transmitted after RV(O) is transmitted with respect to the second code block
  • the constellation rearrangement gain having the predetermined level or more is acquired if RV (2) is transmitted after RV(O) is transmitted.
  • the order of applying the RV numbers of the second code block may be differently applied
  • the RV numbers are applied in order of 0, 1, 2 and 3 with respect to the first code block and the RV numbers are applied in order of 0, 3, 2 and 1 with respect to the second code block such that similar constellation rearrangement gains can be acquired with respect to the both code blocks.
  • the RV numbers for the initial transmission may be differently set according to the code blocks.
  • the RV information which will be used for the current transmission should be signaled via a downlink control channel. Accordingly, in the above-described embodiment, it is preferable that the RV start locations based on the codewords are transmitted between a transmitter and a receiver by signaling.
  • the RVs which will be used for the current transmission may be signaled via a downlink control channel or predetermined RVs may be used.
  • the same scheme as the asynchronous HARQ scheme may be applied. If separate signaling is not performed with respect to the codeword- based RV information, the RV start locations and/or the applied RV patterns may be set to be previously decided and shared between the transmitter and the receiver.
  • the method which is applied when the number of kinds of code blocks having different sizes is 3 or more when the above-described method is applied to the transmission of downlink data or uplink data, the method which is applied when the number of kinds of code blocks is 2 as the above-described example is applicable .
  • the signaling for sharing the RV information between the transmitter and the receiver may be transmitted together with a signal for informing whether or not the data block which is currently transmitted is a new data block.
  • This may be called a new data indicator (NDI) . Accordingly, a signaling method for explicitly representing the NDI and the RVs which are currently transmitted is possible.
  • a retransmission sequence number may be used instead of the NDI. At this time, it may be promised that a specific value of the RSN indicates the initial transmission.
  • the transmission of the RSN may be performed in order of 0, 1, 2 and 3 and the RSN may be continuously maintained at 3 after a fourth transmission. At this time, it is assumed that the RSN is transmitted from the transmitter to the receiver.
  • data and control information are simultaneously transmitted via one physical channel.
  • the data and the control information are transmitted via a physical uplink shared channel (PUSCH) of the 3GPP LTE system.
  • PUSCH physical uplink shared channel
  • the control information is transmitted after performing rate matching with respect to a data part mapped to a physical resource or puncturing data.
  • a method of performing rate matching or puncturing with respect to each code block by the same amount in the entire control information is possible. That is, if the total amount of control information occupies 100 resource elements and the number of code blocks is 3, the resource elements are divided into a group of 33 resource elements, a group of 33 resource elements and a group of 34 resource elements such that a resource space for transmitting the control information is guaranteed. At this time, if the sizes of the code blocks are different, a small number of resource elements may be preferentially allocated to a code block having a small size.
  • the control signal is multiplexed with the data using puncturing
  • a method of equally performing puncturing with respect to the code blocks of the resource allocated to the data regardless of the sizes of the code blocks is possible. That is, if the control information occupies 100 resource elements and 288 (24 resource elements x 12 symbols) resource elements are allocated to the code blocks except a reference symbol, puncturing may be performed regardless of the sizes of the code blocks by arranging the control information to specific symbols.
  • the embodiments of the present invention are applicable to a 3 rd generation partnership project (3GPP)- based system and, more particularly, a 3GPP long term Evolution advanced (3GPP LTE-A) system. If a transmitter performs circular buffer rate matching with respect to information modulated by an M-QAM scheme and transmits the information, the same principle is applicable to other mobile communication systems.
  • 3GPP 3 rd generation partnership project
  • LTE-A 3GPP long term Evolution advanced

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

L'invention porte sur une méthode de transmission de signaux utilisant le schéma HARQ (demande de répétition automatique hybride) pour garantir un gain de réarrangement de constellation présentant au moins un niveau prédéterminé. À cet effet des blocs de code prédéterminés sont codés, des sous-blocs sont intercalés conformément aux blocs de code codés, les sous-blocs intercalés sont transmis conformément aux emplacements de départ de la version redondante (RV) des blocs de code à sous-blocs intercalés. Les RVs sont choisis pour que l'ordre des flux de bits modulés par un schéma M-QAM (M>4) soit modifié lors d'une retransmission. Les RVs sont en outre choisis pour que leurs emplacements de départ appliqués à des blocs de code RV de différentes tailles soient différents.
PCT/KR2009/000085 2008-01-08 2009-01-08 Méthode de transmission de signaux utilisant le schéma harq pour garantir un gain de réarrangement de constellation WO2009088226A2 (fr)

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US12/811,372 US8537909B2 (en) 2008-01-08 2009-01-08 Method for transmitting signals using HARQ scheme to guarantee constellation rearrangement gain

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US1960508P 2008-01-08 2008-01-08
US61/019,605 2008-01-08
KR10-2008-0135489 2008-12-29
KR1020080135489A KR101476203B1 (ko) 2008-01-08 2008-12-29 성좌 재배열 이득을 보장하기 위한 ｈａｒｑ 기반 신호 전송 방법

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019053631A1 (fr) * 2017-09-15 2019-03-21 Telefonaktiebolaget Lm Ericsson (Publ) Réordonnement de blocs codés pour une retransmission harq dans un système new radio

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US20050249163A1 (en) * 2004-05-06 2005-11-10 Samsung Electronics Co., Ltd. Method and apparatus for determining rate matching parameters for a transport channel in a mobile telecommunication system
US20050250454A1 (en) * 2004-05-06 2005-11-10 Benoist Sebire Redundancy version implementation for an uplink enhanced dedicated channel
KR20060051682A (ko) * 2004-09-27 2006-05-19 닛본 덴끼 가부시끼가이샤 자동 재전송 수행을 위한 무선 장치

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KR20030091243A (ko) * 2002-05-25 2003-12-03 삼성전자주식회사 무선 패킷 데이터 채널 수신장치 및 방법
US20050249163A1 (en) * 2004-05-06 2005-11-10 Samsung Electronics Co., Ltd. Method and apparatus for determining rate matching parameters for a transport channel in a mobile telecommunication system
US20050250454A1 (en) * 2004-05-06 2005-11-10 Benoist Sebire Redundancy version implementation for an uplink enhanced dedicated channel
KR20060051682A (ko) * 2004-09-27 2006-05-19 닛본 덴끼 가부시끼가이샤 자동 재전송 수행을 위한 무선 장치

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019053631A1 (fr) * 2017-09-15 2019-03-21 Telefonaktiebolaget Lm Ericsson (Publ) Réordonnement de blocs codés pour une retransmission harq dans un système new radio
US11381344B2 (en) 2017-09-15 2022-07-05 Telefonaktiebolaget Lm Ericsson (Publ) Reordering of code blocks for HARQ retransmission in new radio

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