Control method for repeatedly transmitting ACK/NACK and user equipment (UE)

Abstract

The invention relates to a mobile communication technology and provides a control method for repeatedly transmitting ACK / NACK (Acknowledgement Character / Negative Acknowledgement) and user equipment (UE), which are used for improving the performance of an ACK / NACK repeated transmitting mechanism. When UE receives downlink data of a new HARQ (Hybrid Automatic Repeat Request) progress for each time, if a base station is judged to have correctly judged an ACK / NACK signal transmitted by last HARQ with the same progress number and rest ACK / NACK signal of the last progress, which is not transmittedwith the same progress number, the rest ACK / NACK signal of the last progress with the same progress number is not transmitted any longer; and the rest ACK / NACK signal of the last progress with the same progress number can be continuously transmitted only when the base station does not correctly judge the ACK / NACK signal of the last progress with the same progress number, so that transmission resource of an uplink subframe can be saved and more ACK / NACK signals of the HARQ progress can obtain transmission opportunity.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a control technology for repeated transmission of ACK / NACK in a TDD system. Background technique [0002] Generally, a user equipment (User Equipment, UE) in a HARQ (Hybrid Automatic Repeat Request: Hybrid Automatic Repeat Request) process feeds back ACK / NACK to the base station only once. Sometimes when the cell coverage radius is large, the reliability of ACK / NACK feedback from users at the edge of the cell cannot be guaranteed, and ACK / NACK errors will cause unnecessary retransmissions or residual HARQ errors. In order to ensure the reliability of edge user ACK / NACK, an ACK / NACK repetition (ACK / NACK Repetition) transmission mechanism is adopted in LTE, so that the same ACK / NACK signal can be repeatedly sent in multiple consecutive uplink subframes, eNB Combine multiple received repeated ACK / NACK signals before making a judgment, which can greatly reduce the probability of AC...

AI Technical Summary

Problems solved by technology

In the prior art, it is stipulated that the ACK / NACK signal fed back for HARQ process 1 must be transmitted only after all the ACK / NACK signals fed back for HARQ process 0 have been transmitted, which results in the ACK / NACK signal fed back for HARQ process 1 No uplink transmission resources available

Furthermore, even if the UE correctly receives the downlink data of HARQ process 1, when the eNB does not receive the ACK fed back by the UE, it will generally assume that the downlink data of HARQ process 1 has not been received correctly and retransmit the data, resulting in subsequent The reception error of downlink data may even continue in a vicious cycle, thus affecting the performance of the ACK / NACK repeated transmission mechanism

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