ARQ mechanism able to automatically request retransmissions for multiple rejections

A technology of automatic request retransmission and mechanism, applied in transmission system, digital transmission system, multiplexing communication and other directions, can solve the problems of low channel utilization, high delay and so on

Inactive Publication Date: 2002-11-13
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

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Experimental program
Comparison scheme
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Embodiment Construction

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

[0087] Bit1

Bit2

Bit3

Bit4

……

Bit16

[0088] Table 8 Bitmap format definition used by entity implementation

[0089] relative

Offset1

relative

Offset2

relative

Offset3

[0090] Table 9 Format definition of Relative Offsets adopted by entity implementation

[0091] For the link control PDU defined in Table 7, the confirmation information contained in the link control PDU of...

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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 thethroughput 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 mechanism 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-rejecti...

Claims

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Application Information

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Patent Type & Authority Applications(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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