Method and system for retransmission

Inactive Publication Date: 2007-01-11
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0038] Consequently, it is an object to reduce transmission del

Problems solved by technology

This latency is of such an amount that for some humans it is considere

Method used

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  • Method and system for retransmission
  • Method and system for retransmission
  • Method and system for retransmission

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Embodiment Construction

[0055]FIG. 2 shows a preferred layered protocol structure, a protocol stack, according to the invention. The L2 MAC layer of FIG. 1 has been extended and divided into two sub-layers, a new L2 MAC sub-layer and a new MAC-ARQ sub-layer. Essentially the new L2 MAC sub-layer corresponds to the prior art L2 MAC sub-layer of FIG. 1. The MAC-ARQ plus the MAC layer could be regarded as one single MAC layer extended to also include hybrid ARQ functionality. However, for reasons of explanation they are preferably regarded as separate sub-layers. Further, on the network side, considering them as separate protocol sub-layers physically better corresponds to the physical entities where they reside. As illustrated in FIG. 2 on the UTRAN-side (or network side) L2 MAC sub-layer is preferably located in RNC, whereas L2 MAC-ARQ sub-layer is located in Node B. Hybrid ARQ protocol combine successively received retransmissions. It is a great advantage to have the hybrid ARQ protocol close to the physica...

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Abstract

The present invention relates to retransmissions in a communications system. A method and system of reducing uplink retransmission delay of a radio communications system by introducing an uplink MAC ARQ layer of Node B is disclosed. Further, a MAC PDU data indicator for soft combining control in Node B and RLC PDU reordering is introduced.

Description

TECHNICAL FIELD OF THE INVENTION [0001] The present invention relates to retransmissions in a communications system, and more especially it relates to a cellular mobile radio system, particularly to a Universal Mobile Telecommunications System, UMTS or WCDMA system. BACKGROUND AND DESCRIPTION OF RELATED ART [0002] Retransmission of data to or from a mobile station, MS, or user equipment, UE, is previously known. It is also known to use medium access control and radio link control layers of a UMTS protocol structure in acknowledged mode for dedicated channels. [0003] In acknowledged mode, retransmissions are undertaken in case of detected transmission errors not recovered by forward error control. This is also called automatic repeat request, ARQ. With ARQ, retransmissions can be undertaken unless a transmitted message is (positively) acknowledged. Retransmissions could also be initiated at explicit negative acknowledgments of transmitted messages. Generally there are time limits for...

Claims

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Application Information

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IPC IPC(8): H04J3/24H04L1/18
CPCH04L1/18H04L1/1835H04L1/1809H04L1/1845H04L1/1841
Inventor TORSNER, JOHAN
Owner TELEFON AB LM ERICSSON (PUBL)
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