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Data message request retransmission method and device

A data message and data header technology, applied in the field of communication, can solve the problems of lack of data packet verification and error correction, affecting transmission efficiency, frequent retransmission of data packets, etc., to achieve strong error correction capabilities, improve transmission efficiency, and improve The effect of bandwidth utilization

Inactive Publication Date: 2013-08-07
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a data packet request retransmission scheme, to at least solve the problem in the prior art due to the lack of using the CRC code of the data unit of the data packet in transmission to check and correct the data packet. The data packets need to be retransmitted frequently, which affects the transmission efficiency

Method used

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  • Data message request retransmission method and device
  • Data message request retransmission method and device
  • Data message request retransmission method and device

Examples

Experimental program
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Embodiment 1

[0075] Figure 4 It is a flowchart of a method for requesting retransmission of a data message in a WIMAX system according to Embodiment 1 of the present invention.

[0076] like Figure 4 As shown, the process includes the following steps (step 401-step 408):

[0077] Step 401, the receiving end receives the data message sent by the sending segment for the Kth time;

[0078] Step 402, the receiving end performs FEC verification and error correction on the data message;

[0079] Step 403, judging whether the FEC error correction of the data message is successful, if successful, the data message is saved, otherwise, step 404 is performed;

[0080] Step 404, obtain the i-th data unit of the data message for CRC check and error correction, and judge whether the data unit has failed in error correction, if yes, the data message has failed in error correction, and perform step 407, otherwise, perform step 405;

[0081] Step 405, judge whether the i-th data unit data unit is the...

Embodiment 2

[0086] In this embodiment, step 504 of Embodiment 1 is introduced in detail, Figure 5 It is a flow chart of verifying and error-correcting data units according to Embodiment 2 of the present invention, such as Figure 5 As shown, the process includes (step 501-step 506):

[0087] Step 501, first extract the data header information of the data unit, that is, the first 48 bits of information, CRC coded in the last 8 bits of the 48 bits, and check the data header according to the 8-bit CRC code. If the verification is successful, then no error correction is required, and step 503 is executed; otherwise, step 502 is executed;

[0088] Step 502: Perform 1-bit error correction on the data header, and perform a second check after error correction to determine whether the data header has been successfully corrected. If the error correction is successful, perform step 503; otherwise, determine that the data unit error correction has failed.

[0089] Step 503 : Obtain the data body a...

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PUM

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Abstract

A method and an apparatus for requesting retransmission of data message in physical layer are provided. The method comprises: a receiving side receiving the data message came from a sending side, in which the data message includes data units, and each data unit includes a data head with a first Cyclic Redundant Check (CRC) code and a data body with a second CRC code; verifying and correcting the error of the various data units according to the first CRC code and the second CRC code of various data units; determining whether to inform the sending side to retransmit the data message according to the current number of the retransmission of the data message in the case of failing to correct the error of one of the data units.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for requesting retransmission of a data message. Background technique [0002] Hybrid Auto Repeat Request (HARQ for short) is one of the key technologies of the 802.16 physical layer. For the traditional Auto Repeat Request (ARQ for short), it only performs retransmission control for the frame that checks the error, but ARQ has no error correction function. However, HARQ combines Forward Error Correction Coding (FEC for short) with ARQ to implement the error correction function. Each data packet sent by the sender contains parity bits for error correction and error detection. If the number of error bits in the data packet received by the receiving end is within the error correction capability of the FEC, the error will be corrected by itself; when the error is serious and exceeds the error correction capability of the FEC, the sending end will be notified to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/00H04L12/70
CPCH04L1/0057H04L1/1829
Inventor 楼红伟
Owner ZTE CORP