Method and apparatus for using factorized precoding

摘要

According to one or more aspects, the teachings herein improve user equipment (UE) Channel State Information (CSI) feedback, by letting the precoder part of a CSI feedback report comprise factorized precoder feedback. In one or more such embodiments, the factorized precoder feedback corresponds to at least two precoder matrices, including a recommended “conversion” precoder matrix and a recommended “tuning” precoder matrix. The recommended conversion precoder matrix restricts the number of channel dimensions considered by the recommended tuning precoder matrix and, in turn, the recommended tuning precoder matrix matches the recommended precoder matrix to an effective channel that is defined in part by said recommended conversion precoder matrix.

主权项

1. A method of precoding transmissions from a first device to a second device, said method comprising:
receiving factorized precoder feedback from the second device indicating at least one of a recommended conversion precoder matrix and a recommended tuning precoder matrix that jointly represent a recommended precoder matrix that is a matrix multiplication of the recommended conversion and tuning precoder matrices, wherein said recommended conversion precoder matrix restricts a number of channel dimensions considered by said recommended tuning precoder matrix and said recommended tuning precoder matrix matches said recommended precoder matrix to an effective channel that is defined in part by said recommended conversion precoder matrix; determining a precoding operation based at least in part on evaluating said recommended precoder matrix; and transmitting a precoded signal to the second device that is precoded according to said precoding operation.