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Method and arrangement in a telecommunication system

A cellular communication system and message technology, applied in the field of HARQ process, to achieve the effect of avoiding retransmission

Active Publication Date: 2014-01-29
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
  • Method and arrangement in a telecommunication system

Examples

Experimental program
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Embodiment Construction

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

[0054] Regarding the problem of having two different interpretations of the NDI bit according to the C-RNTI value used to address the user equipment UE, the solution is to ignore the previous dynamically scheduled NDI value to adopt the following after the HARQ process has been used for SPS Any NDI received in the first PDCCH message for dynamic scheduling and interpret it as a new transmission attempt instead of 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 SPS is disabled. It may start with a specific NDI value, for example, 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 with the previous value (using a modulo ...

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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; 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-persistent scheduling and dynamically scheduled transmission. Background technique [0002] To achieve effective link utilization, modern radio interface protocols support Hybrid Automatic Repeat Request (HARQ). HARQ transmission has the feature of transmitting (for example, by using Turbo codes) channel-coded data units to the receiver. The receiver replies with a feedback signal, which indicates successful reception (ACK) or unsuccessful reception (NACK). In the case of receiving a NACK, the data sender retransmits the same data unit or another so-called redundancy version of the same data unit. The HARQ receiver soft-combines all received redundancy versions of a specific data unit. For each terminal, there is one HARQ entity in the transmitting unit (for example, a base station such as eNodeB), and there is one HARQ entity in the receiving unit (for example, user equipment UE). Each HARQ entit...

Claims

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Application Information

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Patent Type & Authority Patents(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)