Method and device for determining HARQ (Hybrid Automatic Repeat request) mode

A mode and detection module technology, applied in the field of communication, can solve problems such as resource conflicts and waste of resources

Inactive Publication Date: 2011-05-11
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If the base station executes according to the normal HARQ process, and the UE's TTI bundling has already taken effect, the UE will execute according to the TTI bundling HARQ process, and will send PUSCH data in 4 consecutive subframes, resulting in scheduling at the same frequency domain position as the base station in the next 3 subframes of businesses generate resource conflicts
If the base station performs the TTI bundling HARQ process, but the UE's TTI bundling does not take effect, the UE will perform the normal HARQ process and only send in one subframe, then it will waste resources at the same frequency domain position in the next three subframes
[0005] Therefore, it is urgent to solve the problem that the base station and the UE may adopt different retransmission modes between when the UE receives the reconfiguration message and when the TTI bundling HARQ mode takes effect.

Method used

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  • Method and device for determining HARQ (Hybrid Automatic Repeat request) mode
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  • Method and device for determining HARQ (Hybrid Automatic Repeat request) mode

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Embodiment Construction

[0024] In the embodiment of the present invention, after receiving the feedback from the UE for the reconfiguration message, it detects whether the TTI bundling mechanism on the UE side is in effect, that is, detects whether the UE has adopted the TTI bundling HARQ mode, and if it is in effect, then determine that the UE adopts the TTI bundling HARQ mode, otherwise It is determined that the UE adopts the normal HARQ mode. After the HARQ mode adopted by the UE is determined, it is beneficial for the network side to adopt the same HARQ mode as the UE, so as to solve the problem caused by the possible adoption of different retransmission modes by the network side and the UE.

[0025] see figure 2 , the main method flow for determining the HARQ mode in this embodiment is as follows:

[0026] Step 201: Send a reconfiguration message to notify the UE to reconfigure to the TTI bundling HARQ mode.

[0027] Step 202: After receiving the UE's feedback on the reconfiguration message, ...

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Abstract

The invention discloses a method for determining an HARQ (Hybrid Automatic Repeat request) mode, which is used for promoting the network side and the terminal side to adopt the same HARQ mode. The method comprises the following steps of: (1) sending a reconfiguration message to UE to notify the reconfiguration of the UE to a TTIbundling HARQ mode; (2) performing activation detection to judge whether a TTIbundling mechanism on the UE side is effective after receiving feedback on the reconfiguration message from the UE; and (3) determining the HARQ mode adopted by the UE according to the detection result. The invention also discloses a device for realizing the method.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and a device for determining a HARQ mode. Background technique [0002] In an LTE (Long Term Evolution) system, in order to improve system performance in a coverage-limited scenario, a HARQ (Hybrid Automatic Repeater) mode is often used. However, due to the increased delay due to HARQ retransmission, LTE has introduced a TTI bundling (transmission interval bundling) mechanism in the R8 (version 8) standard. The TTI bundling mechanism uses non-adaptive automatic retransmission, that is to say, different redundant versions of the transport block are sent in consecutive TTIs, and only the last sent redundant version is ACK (correct response) / NACK (wrong response ) feedback, which overcomes the shortcomings of HARQ retransmission, and improves the uplink coverage effect through the energy accumulation of consecutive TTIs. [0003] In the prior art, after deciding to adopt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18
CPCH04L1/1812H04L1/1896H04W72/12
Inventor 徐明宇徐昊
Owner DATANG MOBILE COMM EQUIP CO LTD
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