Association Integrated SU / MU-MIMO signaling and codebook design with closed loop

Method which comprises: Receiving a first channel feedback at a base station of a first wireless device, said multi-user multiple-input multiple output (multi-user Multiple Input, Multiple Output - MU-MIMO) is implemented, and wherein the first channel feedback a forward channel from the base station to the first wireless describes apparatus, wherein the first channel feedback is quantized using a first codebook, First precoding data for transmission to the first wireless device, wherein the first channel feedback is used, Receiving a second channel feedback to the base station of a second wireless device, wherein single-user MIMO (single user MIMO - SU-MIMO) is implemented, and wherein the second channel feedback describes a downlink channel from the base station to the second wireless device, wherein the second channel feedback is quantized using a second codebook, which is less than the first code book and a subset thereof, and Second precoding data for transmission to the second wireless device, wherein the second channel feedback is used.