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Method and arrangement in a telecommunication system

A technology of a cellular communication system and base station, which is applied in the field of HARQ process to avoid retransmission

Active Publication Date: 2011-08-17
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The required retransmissions are dynamically scheduled (but the HARQ process is still a semi-persistent process

Method used

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  • Method and arrangement in a telecommunication system
  • Method and arrangement in a telecommunication system

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Embodiment Construction

[0053] The invention can be illustrated in the following non-limiting description of embodiments of the invention.

[0054] For the problem of having two different interpretations of the NDI bits depending on the C-RNTI value used to address the user equipment UE, the solution is to ignore the previous dynamically scheduled NDI value to use Any NDI received in the first PDCCH message for dynamic scheduling, and interpret it as a new transmission attempt rather than a retransmission. An additional condition required to avoid HARQ errors is that the PDCCH message is the first PDCCH message used for dynamic scheduling after the SPS is deactivated. May start with a specific NDI value, e.g. always 1 or always 0 or any value of 0 and 1.

[0055] It is foreseen that the UE checks whether the NDI value in the received PDCCH downlink assignment or uplink grant has increased compared to the previous value (taking a modulo 2 operation), or equivalently has switched. That is, the NDI va...

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PUM

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Abstract

The present invention relates to a method in a cellular communication system, for avoiding errors in a HARQ process, wherein an NDI flag is used both for indicating either semi-persistent scheduling, SPS, activation or SPS retransmissions, and also for indicating, by toggling of the flag, a new transmission in dynamic scheduling mode. The method comprises the steps of: receiving, in a scheduling message, an indication that dynamically scheduled transmission will take place; and if a semi persistent resource has occurred for the same HARQ process since a previously received indication for dynamically scheduled transmission, then considering the NDI flag to be toggled regardless of the value of the NDI flag. Thus, if the condition is fulfilled, a UE will always regard the NDI flag as indicating or requesting a new data transmission.

Description

technical field [0001] The present invention relates to HARQ processes for semi-persistently scheduled and dynamically scheduled transmissions. Background technique [0002] To achieve efficient link utilization, modern radio interface protocols support Hybrid Automatic Repeat Request (HARQ). HARQ transmission has the feature of delivering (eg, by using Turbo codes) channel-coded data units to a receiver. The receiver replies with a feedback signal indicating successful reception (ACK) or unsuccessful reception (NACK). In case of receipt of a NACK, the data sender retransmits the same data unit or another so-called redundant version of the same data unit. A HARQ receiver soft-combines all received redundant versions of a particular data unit. For each terminal there is one HARQ entity in the transmitting unit (eg base station such as eNodeB) and one HARQ entity in the receiving unit (eg user equipment UE). Each HARQ entity hosts multiple parallel HARQ processes. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18
CPCH04W72/0406H04L1/1887H04L1/1812H04L1/1854H04L5/003H04W72/20H04W72/23H04W72/12
Inventor M·迈尔M·林德斯特伦H·韦曼J·托斯纳
Owner TELEFON AB LM ERICSSON (PUBL)
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