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Method for adjusting downlink relevant 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, reduce invalid retransmission, and improve transmission efficiency. Effect

Active Publication Date: 2013-10-30
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 PDSCHACK by judging, counting, testing, and confirming feedback ambiguity / NACK feedback ambiguity brings PDSCH performance degradation

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  • Method for adjusting downlink relevant parameters based on feedback ambiguity
  • Method for adjusting downlink relevant parameters based on feedback ambiguity
  • Method for adjusting downlink relevant parameters based on feedback ambiguity

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Embodiment Construction

[0061] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, and are not intended 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 wireless resources. However, the current strategy for using the feedback method is basically a conclusion derived from the channel conditions and link performance of some channels themselves, and it is even a guess, so it is not reliable. The present invention proceeds from reverse analysis, deeply identifies feedback ambiguity, and obtains the real situation of feedback ambiguity through three steps of feedback ambiguity judgment, feedback ambiguity statisti...

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Abstract

Disclosed are a method and apparatus for adjusting downlink related parameters on the basis of feedback ambiguity. The method comprises the steps of: a base station performs a feedback ambiguity determination on the basis of ACK / NACK and a channel quality indicator information (CQI) reported by UE, to determine whether there is a probability of feedback ambiguity; when there is a probability of feedback ambiguity, the base station performs an account for feedback ambiguity on the basis of a feedback manner, a feedback channel, an ambiguity probability corresponding to the number of downlink received subframes and codewords through physical downlink shared channel (PDSCH), to determine whether there is a risk of feedback ambiguity; when there is a risk of feedback ambiguity, the base station performs a feedback ambiguity test by scheduling a single subframe or single codeword of PDSCH for UE, to determine the subframe or codeword showing feedback ambiguity; the base station adjusts downlink related parameters on the basis of a result of the feedback ambiguity test. By identifying feedback ambiguity and performing an ambiguity adjustment for corresponding UE, the present invention can reduce invalid retransmission and increase transmission efficiency.

Description

technical field [0001] The present invention relates to ACK (Acknowledgment, correct response) / NACK (Negative-Acknowledgment, wrong response) of PDSCH (Physical Downlink Shared Channel, physical downlink shared channel) under TDD (TimeDivisionDuplexing, Time Division Duplexing) of the fourth generation mobile communication LTE (LongTermEvolution, long-term evolution) ) Performance comparison and improvement of the two feedback methods Bundling (binding) and Multiplexing (multiplexing). 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, and each half-frame is composed of 4 data subframes and 1 special subframe, and the special subframe includes the downlink pilot time slot DwPTS, There are 3 special time slots in total, the guard time slot GP and the uplink pilot time slot UpPTS. Since the wireless frame can support multiple uplink and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04L1/16
CPCH04L1/12H04L1/20H04L1/0003H04L1/0015H04L1/0026H04L1/1614H04L1/1621H04L1/1825H04L1/1867H04L2001/125
Inventor 刘学斌董晖
Owner 广东世炬网络科技有限公司
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