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Method and device for determining ACK (acknowledgement)/NACK (negative Acknowledgement) feedback bit number

A technology of feedback bits and bits, which is applied in the direction of using the return channel for error prevention/detection, etc. It can solve the problems of reducing coding gain, reducing the effectiveness of ACK/NACK information transmission, and large number of feedback bits.

Active Publication Date: 2011-07-27
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] To sum up, in the LTE-A system, if the number of ACK / NACK feedback bits is always determined according to the number of downlink carriers configured or aggregated by the UE, when the number of downlink carriers activated by the UE is smaller than the number of configured or aggregated downlink carriers, it will Increase the number of unnecessary ACK / NACK feedback information bits, resulting in ACK / NACK feedback information combining operations, reducing the effectiveness of ACK / NACK information transmission, increasing unnecessary system retransmissions, or reducing the coding gain due to the large number of feedback bits , thus reducing the performance of ACK / NACK information transmission

Method used

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  • Method and device for determining ACK (acknowledgement)/NACK (negative Acknowledgement) feedback bit number
  • Method and device for determining ACK (acknowledgement)/NACK (negative Acknowledgement) feedback bit number
  • Method and device for determining ACK (acknowledgement)/NACK (negative Acknowledgement) feedback bit number

Examples

Experimental program
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Embodiment 1

[0118] Embodiment 1: for a TDD system.

[0119] Assuming that downlink carrier 1 is the main downlink carrier, the UE is configured with 4 downlink carriers, and there are 3 downlink carriers in the activated state, which are downlink carriers 1, 2 and 3. Downlink carriers 1 and 2 adopt single codeword transmission mode, and downlink carriers 3 and 4 adopt the multi-codeword transmission mode, M=4, that is, the number of downlink subframes corresponding to ACK / NACK feedback in one uplink subframe on each downlink carrier is 4, and the UE is configured to use PUCCH format 3 to transmit ACK / NACK information , the example of how to indicate the UE to determine the number of ACK / NACK feedback bits is as follows:

[0120] Scenario (1): During the non-ambiguous period when no carrier activation or deactivation or reconfiguration operation is performed;

[0121] Base station: If the number of ACK / NACK feedback bits is calculated according to the configured downlink carrier, then acc...

Embodiment 2

[0159] Embodiment 2: for the FDD system.

[0160] Assuming that downlink carrier 1 is the main downlink carrier, UE is configured with 4 downlink carriers, and there are 3 active downlink carriers, which are downlink carriers 1, 2 and 3, and all downlink carriers are in multi-codeword transmission mode. In the downlink subframe, downlink data transmission is only scheduled on downlink carriers 1 and 2, and the UE is configured to use PUCCH format 1b with channel selection to transmit ACK / NACK information, the example of how to instruct the UE to determine the number of ACK / NACK feedback bits is as follows :

[0161] Base station:

[0162] When the above method 1 is adopted, it is divided into the following scenarios:

[0163] Scenario (1): During the non-ambiguous period when no carrier activation or deactivation or reconfiguration operation is performed, if the number of ACK / NACK feedback bits is calculated according to the configured downlink carriers, then the 4 configured ...

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Abstract

The invention discloses a method and a device for determining ACK (acknowledgement) / NACK (negative Acknowledgement) feedback bit number, and an indicating method and an indicating device for determining the ACK / NACK feedback bit number, which are used for enabling a UE (user equipment) to dynamically determine the ACK / NACK feedback bit number according to a configured downstream carrier, an activated downstream carrier or an indicated downstream carrier set, so as to improve the transmission reliability and transmission efficiency of the ACK / NACK information. The indicating method for determining the ACK / NACK feedback bit number comprises the following steps: a substation determines the indication information, wherein the indication information is used for indicating the UE to determine the mode of the ACK / NACK feedback bit number; and the substation sends the indication information to the UE through a physical downstream control communication channel (PDCCH).

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for determining the number of ACK / NACK feedback bits. Background technique [0002] For the long-term evolution upgrade (LTE-A) Carrier Aggregation (CA, Carrier Aggregation) system, in order to support a wider system bandwidth than the long-term evolution (LTE) system, such as 100MHz, one possibility is to directly allocate 100M bandwidth spectrum, such as figure 1 shown. Another possibility is to aggregate some frequency spectrum allocated to the existing system 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, users may occupy N (N≥ 1) Carriers are used for downlink transmission, and M (M≥1) carriers are occupied for uplink transmission. N is not equal to M, such as figure 2 shown. [0003] The LTE-A system currently su...

Claims

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Application Information

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IPC IPC(8): H04L1/16
Inventor 高雪娟沈祖康林亚男
Owner DATANG MOBILE COMM EQUIP CO LTD
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