Patent ID: 8634319
Filing Date: 2014-01-21
Classification: H04B

Abstract:
1. A method for reporting a channel quality indicator at user equipment (UE) in a wireless communication system, comprising: receiving one or more common reference signals from a base station; computing a channel quality indicator for dual-layer transmission of a physical downlink shared channel, based on the one or more common reference signals; and reporting the channel quality indicator for the dual-layer transmission to the base station, wherein data is mapped to each of a first layer and a second layer corresponding to predetermined antenna ports for a UE-specific reference signal, wherein the data is transmitted from the base station to the UE with the UE-specific reference signal through the predetermined antenna ports, wherein when the UE is configured with a precoding matrix index reporting, the UE computes the channel quality indicator under an assumption that the physical downlink shared channel transmission scheme is a closed-loop spatial multiplexing scheme based on the common reference signals, and wherein when the UE is not configured with the precoding matrix index reporting, the UE computes the channel quality indicator under an assumption that the physical downlink shared channel transmission scheme is a transmit diversity scheme based on the common reference signals.