Multi-beam codebooks with more optimized overhead

摘要

A method for determining an indication of a precoder, a wireless device, and a network node are provided. According to an aspect, a method in a wireless device includes determining an indication of a precoder from a codebook, the indication comprising a first beam phase parameter and a second beam phase parameter corresponding to the first beam and the second beam, respectively . The first beam phase parameter takes one of a first integer number of phase values and the second beam phase parameter takes one of a second integer number of phase values. The following conditions: the second integer number of phase values is less than the first number of phase values; And the second frequency-particle size is larger than the first frequency-particle size. The method includes transmitting a determined indication of a precoder to a network node. According to another aspect, the second beam has less power than the first beam, and the second integer number of phase values is less than the first integer number of phase values.