Method and device for processing acknowledgement (ACK)/negative acknowledgment (NACK) feedback bit

A technology of feedback bits and processing methods, applied in the field of communication, can solve problems such as inconsistency of understanding, affecting system retransmission performance, etc., and achieve the effect of improving transmission reliability and system retransmission efficiency

Active Publication Date: 2011-05-25
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In the LTE-A system, when ACK / NACK is multiplexed and transmitted, there is no clear method for mapping the ACK / NACK feedback information and the ACK / NACK feedback bit sequence actually transmitted by the UE, which will cause the base station and UE to ACK / NACK Inconsistent understanding of NACK feedback information, which affects system retransmission performance

Method used

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  • Method and device for processing acknowledgement (ACK)/negative acknowledgment (NACK) feedback bit
  • Method and device for processing acknowledgement (ACK)/negative acknowledgment (NACK) feedback bit
  • Method and device for processing acknowledgement (ACK)/negative acknowledgment (NACK) feedback bit

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Embodiment 1

[0045] Embodiment 1 of the present invention provides a method for processing ACK / NACK feedback bits, such as Figure 4 As shown, the method includes the following steps:

[0046] Step 401, the UE receives data on N downlink carriers and M downlink subframes.

[0047] Wherein, N≥1, M≥1, ACK / NACK feedback information of M downlink subframes is transmitted in the same uplink subframe.

[0048] When the UE determines that there is no semi-persistent scheduling SPS physical downlink shared channel PDSCH transmission without a corresponding downlink control channel PDCCH on a downlink carrier, or there is an SPS PDSCH transmission without a corresponding PDCCH, and receives a downlink allocation index DAI value equal to M when the PDCCH is received , and execute step 402;

[0049] When the UE determines that there is SPS PDSCH transmission without a corresponding PDCCH on one downlink carrier and no PDCCH with a DAI value equal to M is received, step 403 is performed.

[0050] S...

Embodiment 2

[0066] The second embodiment of the present invention provides a method for processing ACK / NACK feedback bits. The UE needs to feed back ACK / NACK information corresponding to four downlink subframes in one uplink subframe (ie, M=4), and downlink subframe 3 is an SPS subframe. frame, the base station schedules dynamic PDSCH in downlink subframe 3, and the base station schedules 4 subframes in downlink carrier 1 and 3 subframes in downlink carrier 2, such as Figure 5A The schematic diagram of the transmission at the base station side is shown.

[0067] The UE does not receive the PDCCH in the downlink subframe 3 of the downlink carrier 1 (that is, the dynamic scheduling is lost), but the DAI value in the PDCCH in the downlink subframe received by the UE last on the downlink carrier 1 is 4, which is equal to M, like Figure 5B The schematic diagram of UE receiving is shown.

[0068] Let the ACK / NACK feedback bit sequence corresponding to the downlink carrier c be , where c i...

Embodiment 3

[0074] The third embodiment of the present invention provides a method for processing ACK / NACK feedback bits. The UE needs to feed back ACK / NACK information corresponding to four downlink subframes in one uplink subframe (ie, M=4), and downlink subframe 3 is an SPS subframe. frame, the base station dynamically schedules downlink subframes 1, 2 and 4 on downlink carrier 1, and dynamically schedules downlink subframes 2 and 3 on downlink carrier 2, such as Figure 6A The schematic diagram of the transmission at the base station side is shown.

[0075] The UE does not receive the PDCCH in the downlink subframe 2 of the downlink carrier 1 (that is, the dynamic scheduling is lost), and does not receive the PDCCH in the downlink subframe 3 of the downlink carrier 2 (that is, the dynamic scheduling is lost), such as Figure 6B The schematic diagram of UE receiving is shown.

[0076] Let the ACK / NACK feedback bit sequence corresponding to the downlink carrier c be , where c is the ...

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Abstract

The invention discloses a method and device for processing an acknowledgement (ACK)/negative acknowledgment (NACK) feedback bit. The method comprises the following steps: user equipment (UE) receives data in N downlink carriers and M downlink subframes; when determining that semi persistent schedule (SPS) physical downlink shared channel (PDSCH) transmission which does not correspond to a physical downlink control channel (PDCCH) does not exist in one downlink carrier, or SPSPDSCH transmission which dose not correspond to the PDCCH exists in one downlink carrier, and the receiving the PDCCH of which the downlink allocation index (DAI) value is equal to M, the UE carries out mapping on the ACK/NACK feedback information of the downlink carrier by adopting a first class mode; and when determining that the SPSPDSCH transmission which does not correspond to the PDCCH exists on the downlink carrier, and receiving no PDCCH of which the DAI value is equal to M, the UE carries out mapping on the ACK/NACK feedback information of the downlink carrier by adopting a second class mode. According to the embodiment, when the UE loses the packets, the problem that the understanding of a base station is not consistent with the understanding of the UE for the ACK/NACK feedback information can be avoided, thus improving the reliability of the ACK/NACK transmission and the retransmission efficiency of a system.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a method and device for processing ACK / NACK feedback bits. Background technique [0002] For a long-term evolution multi-carrier system, in order to support a wider system bandwidth (such as 100MHz) than the LTE (Long Term Evolution) system, a spectrum with a bandwidth of 100M can be directly allocated, such as figure 1 The schematic diagram of the single-spectrum system shown; some spectrums allocated to the existing system can also be aggregated to form a large bandwidth for the long-term evolution multi-carrier system. At this time, the uplink and downlink carriers in the system can be configured asymmetrically, that is, the user It may occupy N≥1 carriers for downlink transmission and M≥1 carriers for uplink transmission, such as figure 2 Schematic diagram of the spectrum aggregation system shown. [0003] The current LTE-A (LTE-Advanced, LTE-Advanced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18
Inventor 高雪娟沈祖康林亚男
Owner DATANG MOBILE COMM EQUIP CO LTD
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