Patent ID: 8526519
Filing Date: 2013-09-03
Classification: H04B,H04L,H04W

Abstract:
1. A system, comprising: a multiple-input multiple-output (MIMO) base station; a plurality of MIMO user equipment (UE) devices in communication with the MIMO base station; wherein the MIMO base station is configured to switch between a single-user (SU)-MIMO mode and a multiple-user (MU)-MIMO mode during communications with the plurality of MIMO UE devices based on multi-rank precoding matrix indicator (PMI) feedback received from at least one of the MIMO UE devices; wherein the multirank PMI feedback comprises: a first PMI corresponding to a recommended precoding matrix for SU-MIMO communications between the MIMO base station and the plurality of MIMO UE devices, and a rank indicator (RI) corresponding to the rank value of the first PMI; and a second PMI corresponding to a precoding matrix of a pre-defined restricted rank value applicable for MU-MIMO communications between the base station and the plurality of MIMO UE devices.