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ARQ mechanism able to automatically request retransmissions for multiple rejections

A technology that automatically requests retransmission and the sender is applied in the transmission system, using the return channel for error prevention/detection, network traffic/resource management, etc., and can solve problems such as high delay and low channel utilization

Inactive Publication Date: 2004-09-01
武汉汉网高技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of low channel utilization and high delay caused by high bit errors in the wireless link existing in the prior art, and to provide an automatic request retransmission mechanism with high confirmation efficiency and high throughput

Method used

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  • ARQ mechanism able to automatically request retransmissions for multiple rejections
  • ARQ mechanism able to automatically request retransmissions for multiple rejections
  • ARQ mechanism able to automatically request retransmissions for multiple rejections

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0084] Table 6 Definition of the data PDU format used in the specific implementation

[0085] 8

7

6

5

4

3

2

1

Octet1

A / M

FSN

Octet2

FSN

ACK

type

Unus

ed

Octet3

Bitmap / Relative

Offsets

Octet4

Octet5

ACK PDU Count

Octet6

CRC

Octet7

[0086] Table 7 The link control PDU format definition used in the specific implementation

[0087] Bit 1

Bit 2

Bit 3

Bit 4

......

Bit 16

[0088] Table 8 The format definition of the bitmap adopted by the entity implementation

[0089] relative

Offset 1

relative

Offset 2

relative

Offset 3

[0090] Table 9 The format definition of the relative offset used by the entity implementation

[0091] For the link ...

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PUM

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Abstract

This invention relates to ARQ mechanism for data link layer error control in the wireless data communication system, and reforms the unreliable wireless physical link into the reliable data logical link to provide the reliable data transmission sphere for the network layer. Compared with the existing ARQ mechanism, this invention greatly increases the acknowledgement rate, yet does not reduce the throughput rate, greatly lowers the data band-width of acknowledgement, and therefore more data band-width can send the backward data to support two-way data transmission. By fixing the length bit map and relative bias, in accordance with error data PDU distribution, this invention automatically select the acknowledgement type with the highest acknowledgement efficiency to confirm the part of data PDU that need the most acknowlegement in the reception window.

Description

technical field [0001] The invention relates to an automatic retransmission ARQ method for data link layer error control in a wireless data communication system. Background technique [0002] Advanced data link control HDLC automatic request retransmission mechanism and selective retransmission SR automatic request retransmission mechanism are used in low bit error rate wired data communication systems, which can obtain good data transmission efficiency, while in wireless data communication systems, due to The quality of the wireless channel is very poor, and a large amount of link control bandwidth is required to transmit the confirmation information of the error frame, and the confirmation efficiency is very low. Therefore, in a wireless data communication system, an automatic retransmission request mechanism with high acknowledgment efficiency is required. [0003] The third-generation mobile communication standard 3GPP adopts the multi-rejection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04L1/18H04L69/40H04W28/06H04W28/14
Inventor 吴伟民肖瑶杨帆郭磊周宗仪朱光喜
Owner 武汉汉网高技术有限公司
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