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Method, device and system for retransmission in wireless communication system

A wireless communication system and retransmission technology, applied in the field of data transmission, can solve the problem that packet transmission is not completely satisfactory

Inactive Publication Date: 2016-02-24
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, packet delivery in conventional telecommunication systems is still not entirely satisfactory, and an optimized retransmission mechanism is required

Method used

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  • Method, device and system for retransmission in wireless communication system
  • Method, device and system for retransmission in wireless communication system
  • Method, device and system for retransmission in wireless communication system

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Embodiment Construction

[0025] For the purposes of this disclosure, a "transmission" is the first transmission of a particular protocol data unit (PDU) characterized by a sequence number or corresponding identifier. The term "retransmission" refers to any additional transmission related to a PDU with this sequence number. This includes the retransmission of the correct coded version (eg, with HARQ type 1) of the PDU as well as the retransmission of the new coded version of the PDU. The size of the retransmission can be the same or different than the first transmission. Also, with reference to ARQ and / or HARQ functionality, the terms ARQ, ARQ protocol, etc. will be used below in their general meaning.

[0026] figure 1 is a schematic overview of an example WCDMA communication system in which the present invention may be used. The illustrated system 100 includes a radio access network (RAN), such as a universal terrestrial radio access network (UTRAN), and a core network 130 . The RAN performs radi...

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Abstract

The invention relates to retransmissions in wireless communication systems. It is proposed to reduce the retransmission delays by utilizing feedback associated with a lower protocol layer than the conventional feedback messages of the ARQ functionality. After sending a packet from a transmitter towards a receiver, the transmitter monitors the link for a low-level control signal from the receiver. The low-level control information can e.g. comprise power control commands or be related to link quality indicators. Based on this signal, it is decided whether a retransmission is to take place, e.g. at the transmitter or at an external control unit.

Description

technical field [0001] The present invention relates generally to data transmission in wireless communication systems, and more particularly to retransmission in Automatic Repeat Request (ARQ) systems. Background technique [0002] Wireless communication systems depend heavily on reliable packet delivery, and in the event of a transmission failure, the packet (or at least some information related thereto) typically needs to be retransmitted. Of course, the most desirable solution is a communication system designed to eliminate the need for retransmissions. However, this is not feasible since it is not always possible to choose an appropriate transmission power to ensure correct reception of blocks. For example, the maximum possible transmission power is typically limited and power estimates often include measurement errors, leading to an increased likelihood of transmission errors. In addition, there may be unintentional interfering signals causing reception problems. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04W80/02H04L12/855H04L47/2466
CPCH04W28/02H04L47/10H04L47/26H04W8/04
Inventor M·迈耶R·卢德威格
Owner TELEFON AB LM ERICSSON (PUBL)
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