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

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...

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.

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