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Method and system for synthesis applying two-way channel quality indication in TDD system

A technology of channel quality indication and time division duplex system, which is applied in the transmission system, digital transmission system, error prevention/detection using the return channel, etc., and can solve the problems of insufficient reflection of channel characteristics and high signaling overhead of the uplink, etc.

Active Publication Date: 2008-07-30
HUAWEI TECH CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method and system for comprehensive application of two-way channel quality indication in a time division duplex system to solve the problem of periodic feedback of channel quality in the prior art Insufficient reflection of channel characteristics, and enhanced channel quality indicator feedback cause large uplink signaling overhead

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  • Method and system for synthesis applying two-way channel quality indication in TDD system
  • Method and system for synthesis applying two-way channel quality indication in TDD system

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Embodiment Construction

[0018] The present invention will be further described below with specific embodiments in conjunction with the accompanying drawings.

[0019] The invention discloses a method for comprehensively applying two-way channel quality indication in a time division duplex system, the first embodiment of which is as follows figure 1 shown, including the following steps:

[0020] S101. Set a first period t and a second period T.

[0021] A single downlink channel quality indicator is replaced by a comprehensive uplink and downlink channel quality indicator, and the feedback cycles of the uplink and downlink channel CQI are firstly set respectively. In order to reflect the real-time reflection of channel characteristics, and taking into account the possible differences in the uplink and downlink channel environments in specific applications, the feedback period of the uplink channel quality indicator CQI_U can be set to a short period t, and the feedback period of the downlink channel ...

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Abstract

The invention discloses a method for synthesizing and applying two-way channel quality indication in a time division duplex system, which comprises the following steps: setting up a first period t and a second period T. In the first period t, a sending terminal measures an upstream channel signal of a receiving terminal, acquires an upstream channel quality indicator CQI-U and adjusts a transmission policy according to the upstream channel quality indicator. In the second period T, the receiving terminal measures a downstream channel signal, acquires an downstream channel quality indicator, feeds back to the sending terminal, and further adjusts the transmission policy according to the downstream channel quality indicator by the sending terminal. The invention further discloses a time division duplex communication system. The invention replaces the single downstream channel COI feedback in prior art through adjusting the transmission policy by the sending terminal with consideration of the upstream and downstream channel CQI, thus saving the expenditure on upstream signaling and meanwhile reducing possible time delay.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and system for comprehensively applying two-way channel quality indication in a TDD (Time Division Duplex, Time Division Duplex) system. Background technique [0002] With the increasing development of wireless communication technology, terminals have higher and higher requirements on communication rate and service quality. In order to provide the highest possible system throughput and communication quality, the signal receiving end is required to measure and estimate the channel quality, and feed it back to the signal sending end with as little delay and redundancy as possible, so that the sending end can know in time Various characteristics of the transmission channel, and according to these information, make adjustments suitable for the characteristics of the transmission channel in the process of adaptive coding and modulation, resource schedul...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/34H04B7/26H04B17/00H04L1/00H04L1/16
Inventor 杨炼
Owner HUAWEI TECH CO LTD
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