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Feedback method and device for channel quality indication in communication system and communication terminal

A channel quality indication and communication system technology, applied in the field of channel quality indication feedback methods and devices, and communication terminals, can solve problems such as difficulty in accurately adapting to channel states, system performance effects, and differences in mobile fading channel system performance, and achieve the realization of The method has low complexity, accurate channel capacity, and the effect of improving performance gain

Active Publication Date: 2015-07-01
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

However, the system performance under the AWGN channel and static channel characteristics is very different from that of the mobile fading channel system. It is impossible to cover all types of channels with only a fixed set of code rate correction factor values, which will lead to the reported CQI Difficult to accurately adapt to actual channel conditions, thus affecting system performance

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  • Feedback method and device for channel quality indication in communication system and communication terminal
  • Feedback method and device for channel quality indication in communication system and communication terminal
  • Feedback method and device for channel quality indication in communication system and communication terminal

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Embodiment Construction

[0059] In the prior art, in the process of converting the obtained signal-to-noise ratio under the Rayleigh fading channel to the equivalent signal-to-noise ratio under the AWGN channel, the channel state information and the reported CQI are determined with a fixed code rate correction factor, so it is difficult to accurately to adapt to the actual channel state, resulting in an impact on the system performance.

[0060] Therefore, the inventor of the present application has fully analyzed the prior art, and considered from the perspective of channel capacity, taking advantage of the strong correlation of channel capacity, to calculate the channel correlation coefficient between different subframes, and to calculate the channel correlation coefficient according to the channel correlation coefficient. Determine how fast the channel changes to distinguish channels with different moving speeds, select different code rate correction factors, and use the calculated channel capacity ...

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Abstract

The invention provides a feedback method and device for channel quality indication in a communication system and a communication terminal. The method comprises the steps of determining the variation speed degree of the current channel according to the channel association among different sub-frames; selecting corresponding code rate modifying factors based on the variation speed degree of the current channel; treating the calculated channel capacity and the selected code rate modifying factor as the channel state information to obtain the corresponding channel quality indicator; reporting the obtained channel quality indicator to a base station in the communication system. According to the technical scheme, the method has the advantages that the fed back CQI can be accurately adapted to the actual channel state, so that the performance gain of the system can be increased.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a method and device for feeding back a channel quality indication in a communication system, and a communication terminal. Background technique [0002] A channel quality indicator (CQI, Channel Quality Indicator) is a measurement standard for the communication quality of a wireless channel, and is used to adaptively select an appropriate modulation and coding scheme (MSC, Modulation and Code Scheme). The CQI may be a value (or values) representing a channel measure for a given channel. Generally, a high value of CQI indicates that a channel has better quality, and vice versa. The CQI for a channel can generally be determined by using, for example, Signal to Noise Ratio (SNR, Signal to Noise Ratio), Signal to Interference plus Noise Ratio (SINR, Signal to Interference plus Noise Ratio), Signal to Noise and Distortion Ratio (SNDR, Signal to Noise Ratio) plu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 周秦英董霄剑董宇
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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