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Data retransmission method and system based on HARQ

A data retransmission and data packet technology, which is applied in the field of HARQ-based data retransmission, can solve the problems of low retransmission Chasecombining gain and poor performance, so as to improve retransmission combining gain, improve reliability, and solve the problem of low gain Effect

Active Publication Date: 2021-04-30
上海微波技术研究所(中国电子科技集团公司第五十研究所)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1) Solve the problems of low gain and poor performance of retransmission Chase combining

Method used

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  • Data retransmission method and system based on HARQ
  • Data retransmission method and system based on HARQ
  • Data retransmission method and system based on HARQ

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0058] In order to solve the existing problems such as low gain of retransmission Chase combining and low reliability of parity bit demodulation, the present invention provides a data retransmission method based on HARQ.

[0059] A HARQ-based data retransmission method provided according to the present invention includes:

[0060] Step M1: For the data packet transmitted for the first time, divide the bit stream into blocks, and encode each code block after the block, to obtain an encoded bit sequence;

[0061] Step M2: performing rate matching on the coded bit sequence through a rate matching module;

[0062] Step M3: In order to increase the reliability and anti-interference characteristics of data transmission, perform constellation mapping on the rate-matched bit sequence after passing through the interleaver and send it to the receiving end;

[0063] For example: the traffic channel in 5G chooses the row-column interleaver, and the number of rows is the modulation order....

Embodiment 2

[0090] Embodiment 2 is a modification of embodiment 1

[0091] Taking the data transmission process of a 5G service channel as an example, consider a retransmission scenario, and the specific steps are as follows:

[0092] Step 1: Follow the figure 1 The corresponding process performs CB-level CRC addition, padding bit addition, and LDPC encoding on each code block, and punches and truncates the encoded bit sequence, and puts it into the circular buffer;

[0093] Step 2: According to the configured redundant version position k0, the originator takes the E length from the circular buffer as the transmission bit sequence;

[0094] Step 3: High Speed ​​Packet Access (HSPA) row-column interleaving is used for the initial transmission, which can ensure that the information bits of the initial transmission are in the high position of the modulation symbol, and the check bits are in the low position of the modulation symbol, so that the information bits can be in the low position of...

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Abstract

The invention provides a data retransmission method and system based on HARQ. The data retransmission method comprises the steps of: partitioning a bit stream for a data package transmitted for the first time, and coding each code block after partitioning to obtain a coded bit sequence; carrying out rate matching on the coded bit sequence through a rate matching module; performing constellation mapping on the bit sequence after rate matching through an interleaver, and sending the bit sequence to a receiving end; when a received newly transmitted packet does not pass the crc verification, storing the newly transmitted packet which does not pass the crc verification into a corresponding HARQ ID storage; retransmitting the newly transmitted packet which does not pass the crc test; and judging whether the received packet is a retransmission packet or not by the receiving end, and if the received packet is the retransmission packet, combining soft bits corresponding to new transmission and retransmission and decoding combined codes. According to the data retransmission method and the system, the problems of low retransmission Chase coding gain, low check bit demodulation reliability and the like in the prior art are solved.

Description

technical field [0001] The present invention relates to the technical field of data transmission in a wireless communication system, in particular to a HARQ-based data retransmission method and system. Background technique [0002] HARQ (Hybrid Automatic Repeat reQuest) technology is a retransmission combining technology based on the physical layer. It is a data combination of Feed-forward Error Correction (FEC) and Automatic Repeat reQuest (ARQ). The retransmission mechanism overcomes the respective shortcomings of ARQ and FEC, can improve spectrum efficiency, thereby improving system throughput, and makes retransmission bring combined gain. According to whether the retransmitted bit information is the same as the original transmission, the combining technology is divided into two types: chase combining (CC) and incremental redundancy (IR). The retransmitted bit information in chase combining is the same as the original transmission, and the retransmitted bit information i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/18
CPCH04L1/0067H04L1/0071H04L1/1812
Inventor 谢静
Owner 上海微波技术研究所(中国电子科技集团公司第五十研究所)