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

A user equipment of feeding back channel information to coordinated cells, comprising:

• a measurement processing circuitry configured to measure channel quality of downlink channels between the coordinated cells and a user equipment;
• a classification processing circuitry configured to classify the coordinated cells into different coordinated cell classes based on a measurement result of the channel quality;
• a selection processing circuitry configured to select, 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
• a determination processing circuitry configured to determine 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 transmit the determined channel information to the coordinated cells, wherein
• the 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, and
• the calculation manners are one of the following:
• jointly optimizing 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.