Uplink ACK/NACK bundling transmission method, terminal and base station

Abstract

The invention discloses an uplink ACK / NACK bundling transmission method. The method comprises steps: A, the terminal determines downlink sub frames demodulated continuously and correctly in a feedback window and feeds ACK / NACK information back in the corresponding uplink resources according to continuity of a value descried in the specification indicated by the downlink control information (DCI) formats 1 / 1A / 1B / 1D / 2 / 2A / 2B and semi-static scheduling configuration information; and B, the base station detects the ACK / NACK information fed back by the terminal, judges the downlink sub frames demodulated continuously and correctly by the terminal and carries out new transmission on other downlink data assignment besides the downlink sub frames demodulated continuously and correctly in the feedback window. The invention also discloses a terminal and a base station. When the technical scheme of the invention is applied, the data transmission efficiency is improved, and accuracy of judging missing of sub frames, incorrect sub frame demodulation and correct sub frame demodulation can be improved.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a method, terminal and base station for uplink ACK / NACK bundled transmission. Background technique [0002] Due to the asymmetry of TD-LTE uplink and downlink subframes, TD-LTE terminals will feed back ACK / NACK information corresponding to multiple downlink subframes in one uplink subframe. To solve this problem of multiple ACK / NACK feedback, TD - The LTE system defines two feedback modes, ACK / NACK Bundling mode and ACK / NACK Multiplexing mode. The base station notifies the terminal of the specific ACK / NACK feedback mode to be used through the RRC message. The specific RRC signaling is as follows: [0003] rrcConnectionSetup->PUCCH-ConfigDedicated->tdd-AckNackFeedbackMode [0004] The corresponding relationship between the uplink subframe n used to transmit ACK / NACK and multiple downlink subframes is shown in Table 1: [0005] Table 1: Downlin...

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Problems solved by technology

[0014] The binding feedback mode has the following problem: when there is packet loss in the downlink data allocation carried on a downlink subframe within the feedback window, the terminal still performs logical AND on the ACK / NACK information corresponding to all the received downlink data, thereby Ignore the packet loss phenomenon, which will cause the wrong judgment of the feedback information by the TD-LTE base station

[0041] From the above analysis, it can be seen that although the ACK / NACK multiplexing feedback mode avoids additional retransmission compared with the ACK / NACK bundling feedback mode, when the ACK / NACK information is fed back on the PUCCH, due to the actual feedback The information is 2 bits, so only QPSK modulation can be used, which will seriously affect the uplink coverage capability, especially when the terminal is located at the edge of the sector, at this time the downlink data allocation will be a code word, and BPSK modulation is used in the bonding feedback mode Compared with the traditional method, the coverage performance is greatly reduced; when the ACK / NACK information is transmitted on the PUSCH, the number of feedback bits is determined according to the size of the feedback window and the number of downlink data allocations transmitted within the feedback window, and the actual bits of the ACK / NACK information The number is 1-4 bits, which is also higher than the 1-2 bits of the bonded feedback mode

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