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Channel information feedback method, user equipment, method for sending data, and base station

  • US 9,755,806 B2
  • Filed: 07/30/2012
  • Issued: 09/05/2017
  • Est. Priority Date: 08/22/2011
  • Status: Active Grant
First Claim
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1. A method of feeding back channel information to coordinated cells, comprising:

  • measuring channel quality of downlink channels between the coordinated cells and a user equipment;

    classifying the coordinated cells into different coordinated cell classes based on a measurement result of the channel quality;

    selecting, based on different channel quality intervals corresponding to the different coordinated cell classes, channel information feedback modes with different levels of feedback enhancement for the different coordinated cell classes, respectively; and

    determining channel information to be fed back to coordinated cells in respective coordinated cell classes in a predetermined order with use of the selected channel information feedback modes with different levels of feedback enhancement, and transmitting the determined channel information to the coordinated cells, whereinthe channel information feedback modes indicate contents of the channel information to be fed back and/or calculation manners for calculating the channel information to be fed back,the channel information to be fed back is at least one of effective channel quantization information and phase correction angle information, andthe calculation manners are one of the following;

    jointly optimizing both the effective channel quantization information and the phase correction angle information simultaneously; and

    calculating the effective channel quantization information independently, and then jointly calculating the phase correction angle information based on the calculated effective channel quantization information.

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