CN107181575B - Self-adaptive hybrid automatic retransmission method - Google Patents

Self-adaptive hybrid automatic retransmission method Download PDF

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CN107181575B
CN107181575B CN201710285994.XA CN201710285994A CN107181575B CN 107181575 B CN107181575 B CN 107181575B CN 201710285994 A CN201710285994 A CN 201710285994A CN 107181575 B CN107181575 B CN 107181575B
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information
hybrid automatic
decoding
automatic repeat
repeat request
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CN107181575A (en
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焦慧颖
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China Academy of Information and Communications Technology CAICT
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China Academy of Telecommunications Research CATR
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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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • 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
    • H04L1/1864—ARQ related signaling

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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

The application discloses a self-adaptive hybrid automatic retransmission method, which solves the problem of low retransmission efficiency. The embodiment of the application provides a self-adaptive hybrid automatic retransmission method, which comprises the following steps: the receiving end sends a hybrid automatic repeat request to the sending end, and the request contains decoding state information; the sending end identifies the decoding state information and determines the length of coding information of retransmission redundancy; and the sending end sends a bit sequence according to the redundancy version value and the coding information length corresponding to the hybrid automatic repeat request. According to the method and the device, the HARQ feedback of the receiving end is considered to be more accurate in decoding accuracy, and the throughput performance of a user can be greatly improved.

Description

Self-adaptive hybrid automatic retransmission method
Technical Field
The present application relates to the field of communications, and in particular, to a method for requesting hybrid automatic repeat request in an LTE system.
Background
The channel coding, interleaving and rate matching process of LTE is as follows: and forming subblock interleaving after channel coding of each code block, then forming a circular buffer, and selecting a bit sequence sent this time according to a Redundancy Version (RV) and the number of bits.
The hybrid automatic repeat request (HARQ) process for a transport block in LTE contains a maximum of 4 retransmission attempts, with the simplest HARQ retransmission form, only ACK and NACK, and when NACK is received, the same number ρ of coded bits is sent. For example, when a NACK is received, after the rate matching mechanism, a certain number of coded bits from the circular buffer are selected and modulated, and then sent to the receiving end for decoding, that is, the p number of coded bits is used for retransmission. Since the state of the terminal feeding back the ACK/NACK is single, the same ρ number of coded bits are sent for retransmission as long as NACK is received, which greatly affects throughput performance.
Disclosure of Invention
The application provides a self-adaptive hybrid automatic retransmission method, which solves the problem of low retransmission efficiency.
The embodiment of the application provides a self-adaptive hybrid automatic retransmission method, which comprises the following steps:
the receiving end sends a hybrid automatic repeat request to the sending end, and the request contains decoding state information;
the sending end identifies the decoding state information and determines the length of coding information of retransmission redundancy;
and the sending end sends a bit sequence according to the redundancy version value and the coding information length corresponding to the hybrid automatic repeat request.
Preferably, the decoding state information includes a probability of correctly decoding the received data.
Preferably, the automatic repeat request contains more than two states; the states include: one ACK and multiple NACKs; each NACK state corresponds to a probability of correct decoding.
Preferably, in the adaptive hybrid automatic repeat request method, when the probability of correct decoding increases, the sending end reduces the length of the encoded information; and when the probability of correct decoding is reduced, the transmitting end increases the length of the coded information.
Further preferably, the decoding state information is identified by accumulated mutual information of the decoder; the specific value of the accumulated mutual information is calculated by using the log-likelihood ratio at the decoder side.
As an embodiment of further optimizing the adaptive hybrid automatic repeat request method of the present application, the method further includes the following steps:
the sending end sends the length value of the coding information to the receiving end by using the control signaling.
Wherein the control signaling comprises modulation coding information and resource allocation information.
Further, the control signaling includes a redundancy version value.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects: the method provided by the patent introduces the multi-bit feedback report of the HARQ for better self-adaptive matching of the redundancy of the HARQ retransmission length so as to more flexibly support different 5G services and scenes. Considering more accurate decoding accuracy fed back by the HARQ at the receiving end, the throughput performance of the user can be greatly improved.
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The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a flow chart of a hybrid automatic repeat request method according to the present invention;
fig. 2 is a schematic diagram of LTE rate matching;
fig. 3 is a flowchart illustrating a hybrid automatic repeat request method according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The hybrid automatic repeat request (HARQ) in the LTE system has a simple function and is applicable to all service types, and the 5GNR has different service requirements, so as to more effectively optimize the performance of the user side, considering the HARQ configuration with the user as the center. Specifically, the HARQ feedback of the LTE is simple ACK or NACK, which does not reflect more accurate decoding accuracy, and if considering that the HARQ feedback of the receiving end is more accurate decoding accuracy, the throughput performance of the user can be greatly improved.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
FIG. 1 is a flow chart of a hybrid automatic repeat request method according to the present invention;
the embodiment of the application provides a self-adaptive hybrid automatic retransmission method, which comprises the following steps:
step 11, the receiving end sends a hybrid automatic repeat request to the sending end, and the request contains decoding state information;
in step 11, the receiving end feeds back more accurate ACK/NACK information than the prior art, and the specific ACK/NACK information is identified by how many bits without limitation.
Preferably, the decoding state information includes a probability of correctly decoding the received data. Feeding back more accurate ACK/NACK state for identifying decoding state information of the receiving end, namely the probability of correct decoding of the received data, and informing the transmitting end of how far away the HARQ transmission information is successfully decoded
Preferably, the automatic repeat request contains more than two states; the states include: one ACK and multiple NACKs; each NACK state corresponds to a probability of correct decoding.
For example, 2 bits are used to identify ACK/NACK information, for a total of four states, one is ACK, one is NACK but closer to the correct decoding distance, and the last is NACK but farther from the correct decoding distance; if there are more bits (greater than 2 bits) to identify the ACK/NACK information, one state may be ACK and the other state may represent NACK for different probability of correct decoding after quantization.
Further preferably, the decoding state information is identified by accumulated mutual information of the decoder; the specific value of the accumulated mutual information is calculated by using the log-likelihood ratio at the decoder side.
Step 12, the sending end identifies the decoding state information and determines the length of the coding information of the retransmission redundancy;
according to the decoding state information, the sending end can adaptively adjust the length of the coded information of the retransmission redundancy (redundancy) so as to improve the overall HARQ performance.
Preferably, in the adaptive hybrid automatic repeat request method, when the probability of correct decoding increases, the sending end reduces the length of the encoded information; and when the probability of correct decoding is reduced, the transmitting end increases the length of the coded information.
And step 13, the sending end sends a bit sequence according to the redundancy version value and the coding information length corresponding to the hybrid automatic repeat request.
More HARQ information feedback than the conventional art allows for variable length RV redundancy version (redundancy) with a significant performance improvement compared to 1-bit ACK/NACK feedback.
For example, the decoding correctness information collected by the receiving end is defined as IkMeaning the distance from the correct decoding after the kth transmission, i.e. the probability information of correct decoding, the sending end uses this information to determine the number ρ of coded bits actually needed to be transmitted for k +1 retransmissionsk+1(Ik) For consecutive HARQ retransmissions. A simple k +1 retransmission bit pk+1(Ik) The principle of the determination is that if the receiving end feeds back that the transmitting end is relatively far away from the correct decoding (i.e. the received data is positive)The exact decoding probability is low), the bit number of the RV encoded information is increased, and if the distance from the receiving end to the transmitting end for correct decoding is relatively short (i.e. the correct decoding probability of the received data is high), the bit number of the RV encoded information is decreased. The indication of the distance (probability of correct decoding) can be identified by Accumulated mutual information (ACMI) of the decoder, and the specific value of the ACMI is calculated by log-likelihood ratios (LLRs) at the decoder side.
Fig. 2 is a schematic diagram of LTE rate matching. The number of ACK/NACK bits corresponding to a code word fed back by the existing LTE is 1, the number of ACK/NACK bits corresponding to a code word fed back by the existing LTE is expanded, the ACK/NACK state fed back by a receiving end is finer, the fine ACK/NACK state reflects the probability of correct decoding of the receiving end, and the number of coding bits retransmitted by the transmitting end can be changed in a self-adaptive mode according to the state reported by the terminal. In the present application, as shown in fig. 2, in each data transmission process, the rate matching method of LTE selects a bit sequence to be transmitted this time according to the RV and the bit number corresponding to HARQ transmission this time, selects an initial position of the bit sequence according to the value of the RV, and after determining the initial position, selects a bit sequence to be transmitted this time from a circular buffer according to the bit number required for retransmission (as shown by a dashed-line frame in the figure). Component code here
Figure BDA0001280710000000051
And
Figure BDA0001280710000000052
refers to the information after the channel coding,
Figure BDA0001280710000000053
and
Figure BDA0001280710000000054
is the interleaved information, Kw＝3KΠIs the length of the circular buffer.
Fig. 3 is a flowchart illustrating a hybrid automatic repeat request method according to another embodiment of the present invention. As an embodiment of further optimizing the adaptive hybrid automatic repeat request method of the present application, the method further includes the following steps:
and step 14, the sending end sends the length value of the coding information to the receiving end by using the control signaling.
Preferably, wherein the control signaling contains modulation coding information and resource allocation information.
Further, the control signaling includes a redundancy version value.
For example, the bit length E of the RV encoded information specifically transmitted by the transmitting end may be indicated to the receiving end by control signaling, for example, downlink DCI format 0 transmits resource scheduling information of uplink PUSCH, and DCI format 1 transmits scheduling information of downlink single codeword PDSCH, where all of the DCI formats have redundancy version RV values RVidx{0,1,2,3}, modulation coding, and resource allocation information. According to more accurate ACK/NACK information fed back by a receiving end, the number E of RV coding bits needing to be sent by retransmission of a sending end is obtained, and then the sending end adjusts different retransmission RV values RVidxThe modulation coding information and resource allocation information in {0,1,2,3} time, and E-bit coded information bits are transmitted to the terminal.
It should be noted that this patent designs an HARQ scheme for adaptively changing the length of the retransmission coding bit information. The receiving end feeds back accumulated mutual information (ACMI) obtained by decoding at the transmitting end, usually log-maximum likelihood ratio (LLR) during decoding, to feed back more accurate ACK/NACK information, and identifies the distance of decoded received data from correct decoding. And the transmitting end adjusts the number of coding bits of the retransmission Redundancy Version (RV) according to the fed-back information. The simple principle is to increase the number of coded bits of the retransmitted redundancy version if farther away from the correct decoding and to decrease the number of coded bits of the retransmitted redundancy version if closer to the correct decoding. The transmitting end adjusts the number of coded bits of the retransmission redundancy version, and can adjust the number by controlling information such as a modulation coding mode, a resource allocation mode, a Redundancy Version (RV) and the like in signaling.
In the method, the receiving end feeds back more accurate ACK/NACK information, and compared with a method that 1bit in the traditional LTE represents simple ACK or NACK, the method greatly improves the throughput performance of the receiving end.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (5)

1. An adaptive hybrid automatic repeat request method, comprising:
the receiving end sends a hybrid automatic repeat request to the sending end, and the request contains decoding state information; the decoding state information comprises the probability of correctly decoding the received data;
the status included in the automatic repeat request includes: one ACK and multiple NACKs; each NACK state corresponds to a probability of correct decoding;
the sending end identifies the decoding state information and determines the length of coding information of retransmission redundancy;
the sending end sends a bit sequence according to the redundancy version value and the coding information length corresponding to the hybrid automatic repeat request;
the sending end sends the length value of the coding information to the receiving end by using a control signaling, wherein the control signaling comprises modulation coding information and a redundancy version value.
2. The adaptive hybrid automatic repeat request method of claim 1,
the decoding state information includes a probability of correctly decoding the received data.
3. The adaptive hybrid automatic repeat request method according to claim 2,
when the probability of correct decoding is increased, the sending end reduces the length of the coded information;
and when the probability of correct decoding is reduced, the transmitting end increases the length of the coded information.
4. The adaptive hybrid automatic repeat request method according to any of claims 1 to 3,
the decoding state information is identified by accumulated mutual information of a decoder; the specific value of the accumulated mutual information is calculated by using the log-likelihood ratio at the decoder side.
5. The adaptive hybrid automatic repeat request method of claim 1,
the control signaling contains resource allocation information.
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CN110730054A (en) * 2018-07-16 2020-01-24 普天信息技术有限公司 Retransmission method and system for repeated transmission of service channel based on HARQ
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CN101286825A (en) * 2007-04-11 2008-10-15 松下电器产业株式会社 Hybrid automatic retransmitting method based on reliability, transmitting terminal and system thereof
CN102739378A (en) * 2012-06-06 2012-10-17 东南大学 Adaptive virtual hybrid retransmission method applicable to satellite mobile communication system

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CN1925383A (en) * 2006-08-15 2007-03-07 华为技术有限公司 Data packet retransmitting method and transmitting device and retransmitting system
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