Patent ID: 8908617
Filing Date: 2014-12-09
Classification: H04B,H04L,H04W

Abstract:
1. For use in a wireless communications network, a base station configured to communicate with a plurality of subscriber stations, the base station comprising: a transmit path circuitry configured to transmit control information to at least one of the plurality of subscriber stations via a plurality of resource blocks in a subframe; and a receive path circuitry configured to receive uplink data and reference signals from the at least one of the plurality of subscriber stations, wherein the uplink data and reference signals are transmitted using a subset of antenna ports according to a transmission rank R, wherein the control information comprises a cyclic shift indicator (CSI) value indicating a cyclic shift and an orthogonal cover code (OCC) index, corresponding to each of the reference signals, and the CSI value indicates the cyclic shift and the OCC index based on a resource mapping table, wherein the resource mapping table is used to map the cyclic shift vand the OCC index for all transmission ranks R, and wherein if the CSI value in the control information belongs to a first subset of CSI values, the OCC index for a first transmission layer is the same as an OCC index for a second transmission layer, wherein each transmission layer is identified by the transmission rank, and wherein a size of the first subset varies from 0 to 8, and the OCC index for each of a third transmission layer and a fourth transmission layer is different than the OCC index for the first transmission layer.