EP3245744

• Telefonaktiebolaget LM Ericssonsince Oct 20, 2017; EPO record ends Jul 24, 2020

A network node (10) signals to a wireless communication device (14) which precoders in a codebook are restricted from being used. The network node (10) in this regard generates codebook subset restriction signaling that, for each of one or more groups of precoders, jointly restricts the precoders in the group by restricting a certain component (e.g., a certain beam precoder) that the precoders in the group have in common. This signaling may be for instance rank- agnostic signaling that jointly restricts the precoders in a group without regard to the precoders' transmission rank. Regardless, the network node (10) sends the generated signaling to the wireless communication device (14). A network node (10) signals to a wireless communication device (14) which precoders in a codebook are restricted from being used, For each of one or more groups of the codebook the node identifies one or more reference configurations for the group, wherein each reference configuration is one of different possible configurations that restrict different subgroups of precoders in the group from being used; identifies, from the different possible configurations for the group, an actual configuration to be signaled for the group; and generates signaling to indicate the actual configuration for the group, by generating the signaling as a bit pattern whose length depends on (i) whether the actual configuration matches one of the one or more reference configurations and/or (ii) which reference configuration the actual configuration matches; and sends the generated signaling to the wireless communication device (14).

From the international application WO2016114708