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Method, base station and relay station for performing an arq process in relay based system

A relay station and base station technology, applied in radio relay systems, transmission link error control systems, error prevention/detection using return channels, etc., can solve problems such as large delays, ARQ retransmission delays, waste of wireless resources, etc.

Active Publication Date: 2013-05-29
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

UE reordering and the HARQ process for status report transmissions greatly cause delays for possible ARQ retransmissions in between
[0010] The second flaw of this scheme is that the two-step ARQ retransmissions lead to excessive status report transmissions on the Uu interface, wasting precious radio resources
[0011] The third flaw is due to the fact that ARQ between base station and ARS is based on TPDU, which means an extra SN (sequence number) should be applied to every TPDU for ARS reordering process
Because all ARQ retransmissions should be first positioned by UE and then performed by base station, due to RS forwarding, a larger delay will be introduced compared to the no-RS scenario

Method used

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  • Method, base station and relay station for performing an arq process in relay based system
  • Method, base station and relay station for performing an arq process in relay based system
  • Method, base station and relay station for performing an arq process in relay based system

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Embodiment Construction

[0039] The method of performing a downlink ARQ process in a relay-based wireless communication system according to the present invention can be applied to the corresponding 3GPP specification of LTE-Advanced. Thought of the present invention mainly comprises the following points:

[0040] 1) The active ARQ process is triggered by the transmitter instead of the receiver;

[0041] The active ARQ procedure between the base station and the ARS is automatically triggered by the base station (eNode B) after the corresponding L1 (layer 1) transmission fails;

[0042] ARS does not perform a reordering process to locate lost TPDUs; each TPDU has no SN to save header overhead;

[0043] ARS is simple to operate, it only demultiplexes TPDUs into L2PDUs and forwards them to corresponding UEs immediately. This helps reduce latency due to relay forwarding;

[0044] There is no status report from ARS for ARQ process to avoid resource waste;

[0045] ARQ retransmission is triggered by the ...

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Abstract

A method, in a relay-based wireless communication system, for performing downlink ARQ process, is proposed according to the invention. The method comprises: the BS sends first data to the RS, the first data multiplexing second data for one or more terminal equipments; if the transmission of the first data fails, unsolicited ARQ process to the RS is triggered by the BS, so as to perform the retransmission of the first data; the RS demultiplexs the first data transmitted from the BS to generate the second data, and sends the demultiplexed second data to the terminal equipment; if the transmission of the second data fails, the unsolicited ARQ process to the terminal equipment is triggered by the RS, so as to perform the retransmission for the second data; and the terminal equipment receives the second data and triggers a passive ARQ process for the reception of the second data.

Description

technical field [0001] The present invention relates to the field of wireless communication, and more particularly to a method for performing a downlink ARQ (Automatic Repeat Request) process in a relay-based wireless communication system, which can shorten the delay in performing the ARQ process and reduce the Uu interface. Status report transmission. Background technique [0002] The relay concept was proposed as an option for the 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) advanced system. Relays introduced by transmissions of more than one hop should be addressed to meet the goals of 3GPP LTE-A relay requirements. It is foreseeable that DL (downlink) asynchronous HARQ (hybrid automatic repeat request) will be used in 3GPP LTE advanced system for backward compatibility. [0003] The current relay concept has been applied in IEEE. Three ARQ mechanisms are disclosed in the current standard 802.16j / D4: end-to-end, dual-link and hop-by-hop. The end-t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/08
CPCH04L1/18H04L2001/0097H04B7/14
Inventor 杨涛范尼沃诺·安东尼拉
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD