Method for transmitting mixed automatic retransmission request feedback information

A technology of hybrid automatic retransmission and feedback information, applied in wireless communication, error prevention/detection using return channel, network traffic/resource management, etc. The effect of redundant retransmission, improving performance and downstream throughput

Inactive Publication Date: 2012-02-08
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of fixed grouping will cause redundant retransmissions and reduce downlink throughput
by figure 1 Take the n-k2th downlink subframe in as an example, the base station sends downlink data to the UE on two CCs, CC2 and CC3 ( figure 1 The shaded squares in the middle indicate resources that have sent downlink data, while the white squares indicate resources that have not sent downlink data), but the fixed grouping method can only divide these two CCs into the same group, and the two CCs corresponding to After ACK / NACK is bundled, 1-bit ACK / NACK information is fed back. If the transmission of CC2 is successful and the transmission of CC3 fails, the binding operation is performed, that is, the feedback NACK is obtained after performing an AND operation on ACK and NACK, so that the base station receives After NACK, the data of CC2 and CC3 in the n-k2th downlink subframe will be retransmitted, but in fact the downlink data of CC2 has been successfully transmitted, obviously, resulting in redundant retransmission

Method used

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  • Method for transmitting mixed automatic retransmission request feedback information
  • Method for transmitting mixed automatic retransmission request feedback information
  • Method for transmitting mixed automatic retransmission request feedback information

Examples

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example 1

[0043] Example 1. Assuming that the number M of downlink subframes corresponding to an uplink subframe is equal to 4, and the feedback overhead needs to be controlled at 12 bits, each downlink subframe can be divided into up to 3 CC groups. If the number N of CCs is equal to 4, And the DAI field contains 2 bits. At this time, the number of values ​​of the DAI domain is 2 2 , which is equal to the number N of CCs, so the values ​​of these 4 DAI fields can be used to indicate CC groups and the number of CCs in each group.

[0044] The specific indication method can be: use one DAI value to indicate the first CC group and this CC group contains a CC; use another DAI value to indicate the second CC group and this CC group contains a CC; use the other two The DAI value indicates the third CC group and indicates that this CC group includes one CC or two CCs, as shown in Table 1. Correspondingly, image 3 It is a schematic diagram of dynamically grouping CCs in Example 1. After ac...

example 2

[0048] Example 2. Assuming that the number M of downlink subframes corresponding to an uplink subframe is equal to 4, and the feedback overhead needs to be controlled at 12 bits, each downlink subframe can be divided into up to 3 CC groups. If the number N of CCs is equal to 5, And the DAI field contains 3 bits. At this time, because the number of values ​​of the DAI domain is 2 3 , which is greater than the number N of CCs, so the value of the DAI field can be used to indicate CC groups and the number of CCs in each group.

[0049] The specific indication method is: use one DAI value to indicate the first CC group and this CC group contains one CC; use the other two DAI values ​​to indicate the second CC group and indicate that this CC group contains one CC or two CC; use the other two DAI values ​​to indicate the third CC group and respectively indicate that this CC group includes one CC or two CCs, as shown in Table 2, correspondingly, Figure 4 It is a schematic diagram ...

example 3

[0055] Example 3. Assuming that the number M of downlink subframes corresponding to an uplink subframe is equal to 4, and the feedback overhead needs to be controlled at 12 bits, each downlink subframe is divided into a maximum of 3 CC groups. If the number N of CCs is equal to 5, and The DAI field contains 2 bits. This requires using 4 DAI values ​​to indicate the grouping information of 5 CCs.

[0056] The specific indication method can be: use one DAI value to indicate the first CC group and a CC included in this CC group; use another DAI value to indicate the second CC group and this CC group includes a CC; use the other two The DAI value indicates the third CC group and indicates that this CC group includes one, two or three CCs, where one DAI value can be used to indicate that the third group contains two CCs, and another DAI value can be repeatedly defined , indicating that it contains one or three CCs, as shown in Table 3. Because the third group of CCs reuses the DA...

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Abstract

The invention provides a method for transmitting mixed automatic retransmission request feedback information. User equipment (UE) obtains grouping information of a cell carrier (CC) from a downlink assigning instruction (DAI) domain of a physical downlink control channel (PDCCH) of each downlink sub frame, in addition, each CC of the corresponding downlink sub frame is grouped according to the grouping information of the CC, ACK / NACK information corresponding to the downlink data transmission of the CC in each group in each downlink sub frame is bound, the bound ACK / NACK information respectively corresponding to each CC group of each downlink sub frame is obtained, and the ACK / NACK information is sent on the uplink sub frame corresponding to each downlink sub frame. The method has the advantages that the UE feeds back possibly more effective ACK / NACK information, and the redundancy retransmission is reduced, so the downlink throughput is improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for transmitting hybrid automatic repeat request feedback information. Background technique [0002] The Long Term Evolution (LTE) system performs data transmission based on Hybrid Automatic Repeat Request (HARQ), that is, the data receiver transmits acknowledgment (ACK) or negative (NACK) information to the data sender according to whether the data is received correctly, where ACK and NACK are referred to as HARQ feedback information, and are represented by ACK / NACK information in the present invention. The scheduling of dynamic downlink data transmission is completed through the physical downlink control channel (PDCCH). For the semi-persistent scheduling (SPS) service, the initial transmission of downlink data does not need to send PDCCH, and only when the downlink data is retransmitted, it is realized through PDCCH scheduling. . [0003] For the LTE ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04W28/18
Inventor 李迎阳孙程君李小强
Owner BEIJING SAMSUNG TELECOM R&D CENT
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