Patent ID: 9438321
Filing Date: 2016-09-06
CPC Classification: H04B

Claim Text:
1. For use in a user equipment (UE) in a wireless network having two-dimensional antenna systems, a method of codebook sampling, the method comprising: receiving from an eNodeB (eNB) an indication of one or more restricted subsets M of vertical precoding matrices or non-subset restricted precoding matrix indicator (PMI) selection modes, wherein M is less than a total number of vertical precoding matrices N in a codebook and wherein the indication of the restricted subset or the non-subset restricted PMI selection modes is configurable by the network and received form the eNB through a higher layer signalling in conjunction with one or more changed feedback configurations, the codebook comprising a plurality of vertical precoding matrices and horizontal precoding matrices; and feeding back vertical precoding matrix indicators (V-PMI) to the eNB based on the restricted subset of vertical precoding matrices, wherein separate bitmaps are defined for subset restriction of Vertical and Horizontal precoders V and H individually, and wherein at least two bitmaps, A