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A Method for Adjusting Downlink Related Parameters Based on Feedback Ambiguity

A technology of related parameters and feedback methods, applied in the direction of transmission modification based on link quality, adjustment of transmission rate, digital transmission system, etc., can solve problems such as PDSCH performance degradation, improve performance, improve transmission efficiency, and reduce invalid retransmissions Effect

Active Publication Date: 2018-04-27
广东世炬网络科技有限公司
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Problems solved by technology

[0011] The purpose of the present invention is to provide a method for adjusting downlink related parameters based on feedback ambiguity, which can better solve the problem of PDSCH performance degradation caused by PDSCH ACK / NACK feedback ambiguity by judging, counting, testing, and confirming feedback ambiguity

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  • A Method for Adjusting Downlink Related Parameters Based on Feedback Ambiguity
  • A Method for Adjusting Downlink Related Parameters Based on Feedback Ambiguity
  • A Method for Adjusting Downlink Related Parameters Based on Feedback Ambiguity

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[0061] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, but not to limit the present invention.

[0062] Due to the existence of feedback ambiguity, invalid downlink retransmission occurs in the eNB, which reduces the transmission efficiency of the air interface, which is a great waste of precious radio resources. The current use strategy of the feedback method is basically a conclusion derived from the channel conditions and link performance of some channels themselves, and it is even just a guess, so it is not reliable. The present invention starts from reverse analysis, deeply identifies feedback ambiguity, and obtains the real situation of feedback ambiguity through three steps of feedback ambiguity judgment, feedback ambiguity statistics, and feedback ambiguity ...

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Abstract

Provided are a method and apparatus for adjusting a downlink related parameter on the basis of feedback ambiguity. A base station performs feedback ambiguity judgment on basis of ACK / NACK and CQI reported by UE, to determine whether there is probability of feedback ambiguity; when there is probability of feedback ambiguity, the base station collects statistics on feedback ambiguity according to a feedback manner, a feedback channel, an ambiguity probability corresponding to the number of downlink received codewords and the number of downlink received subframes of PDSCH, to determine whether there is risk of feedback ambiguity; when there is risk of feedback ambiguity, the base station performs a feedback ambiguity test by performing single subframe or single codeword scheduling of the PDSCH of a UE, to determine a subframe or codeword with feedback ambiguity; the base station adjusts a downlink related parameter according to a result of the feedback ambiguity test. By identifying feedback ambiguity and performing an ambiguity adjustment for corresponding UE, the solution can reduce invalid retransmission and increase transmission efficiency.

Description

technical field [0001] The present invention relates to the ACK (Acknowledgement, correct response) / NACK ( The performance comparison and improvement of Bundling (binding) and Multiplexing (multiplexing) of the two feedback methods of Negative-Acknowledgement (error response). Background technique [0002] LTE TDD is a branch of LTE, and its frame structure (type 2) is as follows figure 1 As shown, each 10ms radio frame includes 2 half-frames with a length of 5ms, each half-frame consists of 4 data subframes and 1 special subframe, and the special subframe includes downlink pilot time slots DwPTS, The guard time slot GP and the uplink pilot time slot UpPTS have a total of 3 special time slots. Since the radio frame can support multiple uplink and downlink ratios, such as figure 2 and image 3 Therefore, it is more suitable for mobile networks with "asymmetric uplink and downlink data services". For example, for a commercial service model with a higher downlink traffic f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/06H04L1/16
CPCH04L1/0003H04L1/0015H04L1/0026H04L1/1614H04L1/1621H04L1/1825H04L1/1867H04L2001/125
Inventor 刘学斌董晖
Owner 广东世炬网络科技有限公司
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