DEVICE, METHOD AND COMPUTER SOFTWARE PRODUCT FOR BEAM GROUP SELECTION AND BEAM SUBSET IN COMMUNICATION SYSTEM

摘要

1. A device including: a processor; memory comprising a computer program code; wherein said memory and program code are configured to provide, together with said processor, said device to perform at least the following: measuring said device downlink channel state information from a base station, identifying a selected group of beams from a plurality of ray groups in accordance with the broadband property of said channel state information, wherein a characteristic of the aforementioned ray group It depends on the rank of the transmission, and the identification of the selected subset of rays in said selected group of rays in accordance with at least one subband, the number of rays in said selected subset of rays being equal to said transmission rank. 2. The device according to claim 1, wherein said memory and computer program code are also configured to provide, together with said processor, said device to perform at least the following: generating encoded feedback information identifying said selected group of rays and said selected subset of rays for each subbands in a double codebook format, and transmitting said encoded feedback information to said base station. 3. The apparatus of claim 2, wherein said double codebook format includes a first matrix representing said selected group of beams and a second matrix representing said selected subset of beams for each subband. The device according to claim 3, in which