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WO2010115295A1 - Procédé de demande de retransmission, procédé de retransmission et dispositifs correspondants - Google Patents

Procédé de demande de retransmission, procédé de retransmission et dispositifs correspondants Download PDF

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Publication number
WO2010115295A1
WO2010115295A1 PCT/CN2009/000386 CN2009000386W WO2010115295A1 WO 2010115295 A1 WO2010115295 A1 WO 2010115295A1 CN 2009000386 W CN2009000386 W CN 2009000386W WO 2010115295 A1 WO2010115295 A1 WO 2010115295A1
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WO
WIPO (PCT)
Prior art keywords
retransmission
feedback channel
primary
information
transmitter
Prior art date
Application number
PCT/CN2009/000386
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English (en)
Chinese (zh)
Inventor
吴克颖
汪勇刚
王河
李纪
Original Assignee
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.)
Filing date
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/CN2009/000386 priority Critical patent/WO2010115295A1/fr
Priority to CN200980156884.7A priority patent/CN102318254B/zh
Publication of WO2010115295A1 publication Critical patent/WO2010115295A1/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
    • H04L1/12—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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements

Definitions

  • the field of wireless transmission of the present invention particularly relates to a request retransmission method, a retransmission method, and a device thereof.
  • HARQ hybrid retransmission request
  • the current HARQ is based on a transport block (TB). For each received TB and associated
  • HARQ processing should attempt to decode the data in the soft buffer. If the data in the soft buffer is successfully decoded, an acknowledgment (ACK) of positive data is generated in this HARQ process. Otherwise, an acknowledgment (NACK) for the data is generated in this HARQ process.
  • ACK acknowledgment
  • NACK acknowledgment
  • ACK acknowledgment
  • NACK negative acknowledgement
  • HARQ should be based on incremental redundancy (Incremental Redundancy 0 should note that chase merging is a special case of incremental redundancy and therefore can be supported without any doubt.
  • the HARQ acknowledge bit is received from the MAC.
  • Each positive acknowledgment (ACK) is encoded as a binary "0”
  • each negative acknowledgment “NACK” is encoded as a binary "1”.
  • Retransmission information length In some scenarios, only a portion of the original transmitted information is severely corrupted, and the remaining information is received with satisfactory quality. In this case, spectral efficiency can be significantly improved by retransmitting part of the original information instead of all of the original information. Therefore, additional feedback must tell the BS which part of the information needs to be retransmitted.
  • Interleaving pattern for retransmission In order to better utilize the frequency/time diversity of the channel, the retransmitted symbol bits may be transmitted in an order different from the order used in the previous transmission. This means you can use no The same interleaving pattern, which may be fixed in advance or selected by the MS from the pre-defined set of interleaving patterns according to the current channel conditions, and fed back to the BS along with the NACK signal.
  • FEC block index In some cases, several FEC blocks share the same CRC portion to reduce the load. When an error is detected, it is likely that not all FEC blocks but only some of them have errors. In this case, it is more efficient to retransmit only the FEC blocks that have errors, not all FEC blocks.
  • the optimal precoding matrix for retransmission is also likely to be different from the optimal precoding matrix for original/previous transmission.
  • the MS can reselect the precoding matrix to optimize the retransmission performance and feed back the updated precoding matrix index along with the NACK signal to the BS to improve the quality of the retransmission.
  • embodiments of the present invention propose a system, a transmitter, a receiver, and a method thereof for retransmission.
  • a method for requesting retransmission comprising the steps of: receiving a signal from a transmitter and determining whether retransmission is required, and feeding back in the main feedback channel whether a transmitter is required to perform retransmission. Instructing information; and if retransmission is required, feeding back retransmission enhancement information in a second feedback channel associated with the primary feedback channel, the retransmission enhancement information being a reception quality or transmission validity of the signal for retransmission of the levee Information.
  • a retransmission method comprising the steps of: receiving a feedback signal in a primary feedback channel and a second feedback channel associated with the primary feedback channel; if found in primary feedback
  • the channel carries a message that requires retransmission and carries retransmission enhancement information in a second feedback channel associated with the primary feedback channel, and performs retransmission according to the retransmission enhancement information carried in the second feedback channel, where
  • the retransmission enhancement information is information for improving reception quality or transmission validity of a signal to be retransmitted.
  • a transmitter comprising: a receiving control unit, configured to receive a feedback signal in a second feedback channel associated with a primary feedback channel and a primary feedback channel, if found Carrying a message requesting retransmission in the primary feedback channel and in association with the primary feedback channel
  • the retransmission enhancement information is carried in the second feedback channel, and the retransmission enhancement information is used to improve the reception quality or transmission of the retransmitted signal according to the retransmission enhancement information carried in the second feedback channel.
  • Information of validity a retransmission unit, used to retransmit according to the indication.
  • a receiver including: a transmission control unit, configured to receive a signal from a transmitter and determine whether retransmission is required, and indicate whether feedback is required in a primary feedback channel.
  • Retransmitted indication information and if retransmission is required, indicating feedback of retransmission enhancement information in a second feedback channel associated with the primary feedback channel, the retransmission enhancement information being used to improve reception quality of the retransmitted signal Or transmission of validity information; feedback unit: used to feedback according to the indication.
  • a system for retransmission including the above transmitter and the above receiver.
  • the existing HARQ feedback channel structure cannot support advanced HARQ techniques to require additional information from the MS to improve the quality/efficiency of retransmissions.
  • the technical solution of the present invention solves this problem by introducing a hierarchical structure of a HARQ feedback channel and a second HARQ feedback channel based on a contention mechanism. This solution not only provides a solution that supports advanced HARQ technology, but also minimizes potential loads. Since multiple primary HARQ feedback channels share a second HARQ feedback channel in a competitive manner, the additional feedback load can be effectively reduced. By carefully selecting the number of primary HARQ feedback channels sharing a second HARQ feedback channel, the collision probability can be effectively controlled and the efficiency of the second HARQ feedback channel can be maximized.
  • Figure 1 is a schematic diagram showing the results of LTE reception simulation
  • FIG. 2 is a schematic structural diagram of a system according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a transmitter according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a receiver according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of request retransmission according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram showing a hierarchical retransmission feedback channel structure according to an embodiment of the present invention
  • FIG. 9 is a flow chart of an encoding step in accordance with an embodiment of the present invention.
  • FIG. 10 is a schematic diagram showing an example of changing a retransmission format based on a code block error according to an embodiment of the present invention.
  • FIG. 11 is a flow chart of performing retransmission according to an embodiment of the present invention.
  • FIG. 12 is a schematic diagram showing the gain of the HARQ and the change retransmission format proposed by the embodiment of the present invention. detailed description
  • a second HARQ feedback channel can be provided in an embodiment of the invention. Since additional retransmission enhancement information is required only when feedback "NACK" is required, it is difficult to assign a second HARQ feedback channel to each user in advance.
  • One possible solution is to assign a second HARQ feedback channel to each user. However, since in a real system, the probability of decoding failure is approximately 10% to 20%, if a second HARQ feedback channel is allocated for each user, more than 80% of the resources are wasted. Therefore, preferably, embodiments of the present invention propose a second HARQ feedback channel based on a contention mechanism to solve this problem.
  • the basic idea of an embodiment of the present invention is to define a hierarchical structure of a HARQ feedback channel:
  • the primary HARQ feedback channel is the same as a conventional HARQ feedback channel, and is used to transmit "ACK" and "NACK” indicators, and the second HARQ feedback channel is feedback"
  • the transmission of NACK" is to send additional information to improve the quality/efficiency of the retransmission.
  • the primary HARQ channel is for transmission-specific, that is, one HARQ feedback channel is allocated for each HARQ-enabled transmission.
  • the second HARQ feedback channel is allocated to multiple primary HARQ feedback channel sharing, and the user who needs to retransmit can feed back the retransmission enhancement information on the second HARQ feedback channel. A plurality of users who need to feed back information on the same second HARQ feedback channel need to compete.
  • the following describes the uplink channel of the 3G LTE system as an example.
  • the size of the transport block (TB) is larger than the TB in UMTS.
  • approximately 64.5% are segmented into multiple code blocks (CBs).
  • CBs code blocks
  • TB and its CB are protected with the same CRC.
  • CRC code blocks
  • Only a few CB decodings may fail, but the entire TB will be retransmitted, resulting in wasted resources.
  • Table 1 show that when the first transmission error rate is about 5% to 20%, it is wasted. The ratio is about 15% to 20%.
  • the transport block with the CRC sequence is 14688, which is segmented into 3 code blocks.
  • Figure 1 shows the results of the simulation. As can be seen from Figure 1, when the first transmission error rate is about 10%, the block correctness rate reaches 20%. When the bandwidth is widened and the transport block becomes larger, the correct rate of the code block becomes larger, and the waste caused by retransmitting the transport block is also greater.
  • embodiments of the present invention propose base stations, mobile terminals, systems and methods for retransmission.
  • Embodiments of the present invention propose a system for retransmission, as shown in Figure 2, which includes a transmitter and a receiver as described below.
  • Embodiments of the present invention also propose a transmitter for retransmission.
  • the transmitter includes:
  • the receiving control unit 310 is configured to receive a feedback signal in the second feedback channel and the second feedback channel associated with the primary feedback channel, if it is found that the primary feedback channel carries the indication information requesting retransmission and is in the primary feedback channel
  • the associated second feedback channel carries retransmission enhancement information, and indicates that retransmission is performed according to the retransmission enhancement information carried in the second feedback channel, where the retransmission enhancement information is used to improve the reception quality or transmission of the retransmitted signal.
  • Information of validity a retransmission unit 320, configured to perform retransmission according to the indication.
  • the receiving control unit 310 includes: a despreading module 312, configured to despread the received signal in the third feedback channel by using a spreading sequence associated with the primary feedback channel; and a measuring module 314, configured to measure the despreading module
  • the SINR of the despread signal is 312.
  • the determining module 316 is configured to, when determining that the SINR measured by the measurement module 314 is greater than a predetermined threshold, instructing to use the despreading module 312 to despread the obtained retransmission enhanced information for retransmission.
  • the transmitter may further include a channel association unit 330 for pre-setting a correspondence between the primary feedback channel and the second feedback channel for use by the despreading module 312.
  • the transmitter may further include a spreading sequence processing unit 340 for predetermining the set of spreading sequences, assigning one spreading sequence of the set of spreading sequences to each primary HARQ feedback channel for use by the despreading module 312.
  • a spreading sequence processing unit 340 for predetermining the set of spreading sequences, assigning one spreading sequence of the set of spreading sequences to each primary HARQ feedback channel for use by the despreading module 312.
  • the receiver includes a transmission control unit 410 for receiving a signal from a transmitter and determining whether retransmission is required, and in the main feedback
  • the feedback in the channel requires the transmitter to perform retransmission indication information; if retransmission is required, the retransmission enhancement information is fed back in the second feedback channel associated with the primary feedback channel, where the retransmission enhancement information is used to improve the retransmission Information on the reception quality or transmission validity of the signal; a feedback unit 420 for performing feedback according to the indication.
  • the receiver further includes a spreading unit 430 for spreading the retransmission enhancement information using a spreading sequence associated with the primary feedback channel; the transmission control unit 410 indicating a second feedback channel associated with the primary feedback channel
  • the retransmission enhanced information is carried in the spread spectrum.
  • the receiver may further include a spreading sequence processing unit 440 for predetermining the set of spreading sequences, and assigning one spreading sequence of the set of spreading sequences to each primary HARQ feedback channel for use by the spreading unit 430.
  • the receiver may also include a channel association unit 450 for presetting the correspondence between the primary feedback channel and the second feedback channel for use by the transmission control unit 410.
  • the transmission control unit 410 and the spreading unit 430 can also receive information about the spreading sequence and the correspondence between the primary feedback channel and the second feedback channel from the base station as the transmitter.
  • transmitter and receiver of the embodiments of the present invention have been described above in the form of separate functional modules, each of the components shown in Figures 3 and 4 can be implemented in multiple devices in practical applications, showing many Group
  • the device can also be integrated in a chip or a device in practical applications.
  • the transmitter and receiver may also include any unit and device for other purposes.
  • FIG. 5 shows a flow chart of requesting retransmission in an embodiment of the present invention.
  • the channel association unit 330 of the transmitter or the channel association unit 450 of the receiver sets a correspondence between the primary feedback channel and the second feedback channel.
  • Fig. 6 shows a hierarchical structure of a HARQ feedback channel in an embodiment of the present invention.
  • a plurality of primary HARQ feedback channels share a common second HARQ feedback channel.
  • the corresponding user competes to use the second HARQ feedback channel to transmit additional information to the base station to improve the quality and efficiency of the retransmission.
  • the BS decodes the message on the second HARQ feedback channel decoding and uses the message to design a retransmission format, i.e., a precoding matrix of the failed message, retransmission information, an interleaving pattern used, and the like.
  • a retransmission format i.e., a precoding matrix of the failed message, retransmission information, an interleaving pattern used, and the like.
  • the BS may rely on different spreading sequences on the second HARQ feedback channel to distinguish retransmission enhancement information from different users, and use the despread SINR to determine whether the detection is correct. If the despread SINR is above a predetermined threshold, the detection is considered correct and the information is used for retransmission. If the despread SINR is below the predetermined threshold, then the detection error is considered and the retransmission is degraded to the conventional case without any retransmission enhancement information.
  • a key design consideration for embodiments of the present invention is to balance the trade-offs between collision probabilities.
  • the probability of collision depends on the number of primary HARQ feedback channels (N) sharing the same second HARQ feedback channel and the decoding failure probability (j3 ⁇ 4) of each transmission.
  • N the number of primary HARQ feedback channels sharing the same second HARQ feedback channel
  • j3 ⁇ 4 the decoding failure probability
  • N primary HARQ feedback channels share a second HARQ feedback channel.
  • the probability of collision can be calculated as:
  • the resource usage rate can be expressed as the probability of successful delivery on the second HARQ feedback channel, ⁇ :
  • the goal of the trade-off is to give the appropriate value N for the given value; to maximize e# while keeping /i ⁇ acceptable value.
  • N the efficiency has a global maximum point
  • Pe increases as N increases, which is reasonable because when more primary HARQ feedback channels share a common number
  • the appropriate value N can be selected according to these figures for different purposes to maximize efficiency ⁇ below a predetermined threshold.
  • step 512 the sequence processing unit 340 of the transmitter or the spreading sequence processing unit 440 of the receiver predetermines a set of spreading sequences (orthogonal or semi-orthogonal sequences).
  • the spreading sequence processing unit 340 of the transmitter or the spreading sequence processing unit 440 of the receiver allocates one spreading sequence in the set of spreading sequences for each primary HARQ feedback channel.
  • Different primary or secondary HARQ feedback channels may be assigned different or identical based on the number N of primary HARQ feedback channels corresponding to the same second HARQ feedback channel determined in step 610, and the size of the spreading sequence group determined in step 620.
  • Spreading sequence For example, if the number N of the primary HARQ feedback channels is greater than the size of the spreading sequence group, first, different spreading sequences are allocated to the primary HARQ feedback channel, and after the spreading sequence is allocated, the allocated spreading sequence groups are repeatedly used. It is assigned to the remaining primary HARQ feedback channel.
  • step 514 the correspondence between the set of spreading sequences and its primary HARQ feedback channel is shared between the BS and the MS.
  • steps 510 to 514 are performed in the base station, and at this time, the base station may be a transmitter or a receiver.
  • the mobile terminal can receive information about the spreading sequence and the correspondence between the primary feedback channel and the second feedback channel from the base station.
  • the information determined by the above steps can be used in multiple retransmissions, so it is not necessary to repeat this step before each retransmission.
  • the transmitter is a base station and the receiver is a mobile terminal.
  • the method of requesting retransmission will be explained.
  • the feedback unit 420 of the receiver feeds back a "NACK" message in the primary HARQ feedback channel, and the spreading unit 430 of the mobile terminal is used as the primary The spreading sequence assigned by the HARQ feedback channel spreads the retransmission enhancement information.
  • step 518 feedback unit 420 carries the spread information in a second HARQ feedback channel associated with the primary HARQ feedback channel for transmission.
  • FIG. 9 shows the processing structure for the DL-SCH, PCH and MCH transport channels.
  • TTI transmission time interval
  • Step 910 Add the CRC to the transport block
  • Step 920 Perform code block segmentation on the transmission segment and CRC attachment of the code block.
  • Step 930 Channel coding the code block that has code block segmentation and code block CRC attachment
  • Step 940 Perform rate matching
  • Step 950 Code block concatenation
  • Error detection is provided to the transport block by cyclic redundancy check (CRC).
  • CRC cyclic redundancy check
  • the proposed HARQ scheme pays more attention to the details of the TB data. Although the transmission is always based on TB, the feedback and retransmission are different from transport block based HARQ.
  • a primary indicator is a binary for carrying an ACK or NACK transmitted on the primary HARQ feedback channel
  • the second indicator is a code A bitmap sequence of the block for carrying retransmission enhancement information transmitted in the second HARQ feedback channel.
  • a 4-bit CRC is appended to the HARQ indicator (; HI) (second indicator) as shown in Table 2.
  • Table 2 Codewords in HARQ-based code blocks If the transport block is mapped to two layers of spatial multiplexing, the transport block can be multiplied. One way is to increase the indicator to 24 bits, but this can cause an overload. Another method is to use 12 bits to indicate two code blocks with 1 bit.
  • the submitted HARQ scheme should be adaptive based on the transmission properties (i.e., transport blocks that only include incorrect code blocks).
  • Adaptive means that the transmitter can change some or all of the attributes used in each retransmission (e.g., due to changes in the transport block format) compared to the initial transmission. Therefore, the associated control information needs to be sent along with the retransmission.
  • the changes considered include:
  • the HARQ process is similar to the previous one. It includes IR, N-channel stop-and-wait protocol, synchronous or asynchronous, adaptive and soft cache management. Although the feedback HARQ indicator can occupy more bits, retransmission can apply a lower code rate for higher reception performance.
  • Figure 10 illustrates one embodiment of changing the retransmission format based on code block errors.
  • the initial transmission applies 2/3 Turbo code and 16 QAM, and divides one transport block into 3 code blocks. If the receiver verifies that two code blocks are in error and the other is correct, feedback indicator 110 (or 011, 101). The transmitter should retransmit the first two code blocks (or the last two code blocks, or the first and third code blocks). In order to fill the entire transport block, 4/9 Turbo code rate is applied and 16QAM modulation is maintained.
  • the receiver verifies that only one code block is in error and the remaining two are correct, the feedback indicator 100 (or 010, 001).
  • the transmitter understands that the first code block (or the second last code block, or the third code block) should be retransmitted. In order to fill the entire transport block, 4/9 Turbo code rate should be maintained and QPSK modulation applied.
  • a 1-bit primary indicator is used to indicate whether the transport block is erroneous ACK/NACK, and a second indicator is used to indicate a bitmap error block bitmap. If a positive acknowledgment (ACK) is encoded in the primary indicator, there is no need to The second indicator is encoded. Taking the second indicator as 16. For example, assuming that the probability of the first transmission error is 10% to 20%, the total load of the feedback is:
  • the transport block size determines the second indicator size. If the size of the second indicator is limited according to the transport block size, the actual load will be smaller.
  • Figure 11 is a flow diagram of retransmission in accordance with an embodiment of the present invention. As shown in Figure 11:
  • step 1110 when the "NACK" message is carried in the primary HARQ feedback channel, the despreading module 312 in the receiving control unit 310 of the base station uses the spreading sequence associated with the primary HARQ feedback channel in the second HARQ feedback channel. The received signal is despread.
  • step 1120 the measurement module 314 of the base station measures the SINR of the despread signal.
  • the decision module 316 of the base station determines whether the SINR measured by the measurement module 314 is greater than a predetermined threshold. If the detection of the second HARQ feedback channel is considered successful, if greater than the predetermined threshold, the retransmission unit 320 of the base station in step 1150 utilizes The despreading module 312 despreads the retransmission enhanced information for retransmission; otherwise, it is considered that the detection of the second HARQ feedback channel fails, the obtained retransmission enhancement information is discarded in step 1140, and the retransmission unit 320 performs the conventional HARQ retransmission.
  • Fig. 12 is a diagram showing the gain of the HARQ and variation retransmission format proposed by the embodiment of the present invention. As shown in Fig. 12, according to the code block error, the proposed HARQ scheme using the change retransmission format can obtain the gain of ldB as compared with the conventional IR HARQ scheme.
  • the base station is a transmitter and the mobile terminal is a receiver (i.e., downlink), however, those skilled in the art can easily infer that the above system, transmitter, receiver And methods can also be used where the base station is the receiver and the mobile terminal is the transmitter (ie, the uplink).
  • a second HARQ feedback channel is used for multiple primary HARQ feedback channels.
  • more than one second HARQ feedback channel may also be used.
  • the number of second HARQ feedback channels can be increased to reduce the probability of collision.
  • the technical solutions provided by the embodiments of the present invention are equally applicable to other high-speed wireless communication systems, such as LTE-Advanced and WiMAX IEEE 802.16 systems.
  • the content included in the retransmission enhancement information may also be different according to different systems, for example, the retransmission enhancement information may further include an interlace pattern, a FEC index, and/or a codebook index for retransmission. It is not limited to the length of the retransmission information used in the above embodiment.
  • some embodiments also include a machine readable or computer readable program storage device (eg, a digital data storage medium) and encoding machine executable or computer executable program instructions, wherein the instructions perform some of the above methods or All steps.
  • the program storage device can be a digital memory, a magnetic storage medium (such as a magnetic disk and magnetic tape), a hardware or an optically readable digital data storage medium.
  • Embodiments also include a programming computer that performs the steps of the above method.

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

Abstract

L'invention porte sur un procédé de demande de retransmission, un procédé de retransmission et l'émetteur, le récepteur et le système correspondants. Le procédé de demande de retransmission comprend les étapes suivantes : des signaux provenant de l'émetteur sont reçus et il est déterminé si une retransmission est nécessaire ou non; les informations d'indication du fait que l'émetteur doit exécuter une retransmission ou non sont renvoyées dans un canal de rétroaction principal; si une retransmission est nécessaire, alors des informations d'amélioration de retransmission sont renvoyées dans un second canal de rétroaction associé au canal de rétroaction principal, et les informations d'amélioration de retransmission sont utilisées pour améliorer la qualité de réception ou l'efficacité de transmission de signaux de retransmission. Avec la solution technique, la qualité et l'efficacité de retransmission peuvent être efficacement améliorées.
PCT/CN2009/000386 2009-04-10 2009-04-10 Procédé de demande de retransmission, procédé de retransmission et dispositifs correspondants WO2010115295A1 (fr)

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CN200980156884.7A CN102318254B (zh) 2009-04-10 2009-04-10 请求重传方法、重传方法及其设备

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