Method and apparatus for notifying protocol unit length variation

A protocol data unit, length variation technology, applied in the direction of error prevention/detection using the return channel, can solve the problems of high resource overhead and long delay in signaling interaction, so as to improve reliability, reduce transmission failures and save money. The effect of bandwidth resources

Active Publication Date: 2007-09-05
SHANGHAI ULTIMATE POWER COMM TECH
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  • Abstract
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Problems solved by technology

[0008] Aiming at the disadvantages of long delay and high resource overhead in the signaling interaction mode in the prior art, the present inven...

Method used

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  • Method and apparatus for notifying protocol unit length variation
  • Method and apparatus for notifying protocol unit length variation
  • Method and apparatus for notifying protocol unit length variation

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Embodiment Construction

[0036] Fig. 3 is a flowchart of a method for notifying a protocol data unit length change according to an embodiment of the present invention.

[0037] The Upper ARQ layer segments the service data unit (SDU), and the HARQ layer adds some header marks to the segmented data, for example, the segment sequence number (SN), and segment identification, filling amount, filling, etc. , Generate Upper ARQ PDU. The Upper ARQ PDUs will be concatenated at the HARQ layer, sent to the receiving end, analyzed at the receiving end through reverse steps, and combined into SDUs, thereby completing data transmission.

[0038] In step 301, the length of the Upper ARQ (higher layer retransmission control) PDU to be concatenated is compared with the segmented Upper ARQ PDU length value during the current data transmission. The length value of the UpperARQ PDU to be concatenated is obtained from the data transmitted by the Upper ARQ layer according to the corresponding transmission protocol. In t...

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Abstract

The invention is used in a communication system with at least two layers of retransmission control function. It comprises: deciding the length of PDU generated by an upper retransmission layer is changed; setting a length indication domain in lower retransmission control PDU; transmitting lower layer retransmission control PDU to the sending end. The invention also providing an apparatus thereof comprising: a comparison unit, a setting unit and a sending end.

Description

technical field [0001] The invention relates to an automatic retransmission request method, in particular to a method and device for notifying the length change of a protocol data unit. Background technique [0002] In 3G Long Term Evolution (LTE), a two-layer retransmission mechanism using HARQ+Upper ARQ (Automatic Repeat Request) has been agreed upon. Among them, HARQ (Hybrid Automatic Repeat Request) mainly obtains a combination gain through detection of error blocks, retransmission and combination, so as to improve the utilization rate of physical resources. For error blocks that cannot be detected by HARQ or error blocks that fail to be transmitted after multiple retransmissions, the outer layer ARQ (Upper ARQ) is responsible for detection and retransmission. [0003] FIG. 1 is a schematic diagram of a two-layer automatic repeat request mechanism. In the double-layer ARQ (Automatic Repeat Request) structure, the SDU (Service Data Unit) is segmented at the Upper ARQ la...

Claims

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Application Information

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IPC IPC(8): H04L1/18
Inventor 毕海洲李国庆高卓蒋守宁
Owner SHANGHAI ULTIMATE POWER COMM TECH
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