METHOD AND APPARATUS FOR REPORTING DOWNLINK CHANNEL STATE

摘要

A method and apparatus for reporting a downlink channel state to a serving Base Station (BS) at a User Equipment (UE) in a wireless communication system in which each of N (N is an integer equal to or larger than 2) BSs transmits one or more independent layers to the UE are disclosed. The method includes receiving configuration information about a channel state information reference signal (CSI-RS) process including CSI-RS resource i (i=0, . . . , N—1) and one channel state information interference measurement (CSI-IM) resource, the CSI-RS resource i being allocated to BS i from among the N BSs, performing channel measurement in CSI-RS resource i to measure downlink channel Hi from BS i, and transmitting, to the serving BS, a channel state report including a precoding matrix index i (PMIi) and a rank indicator i (RIi), which maximize throughput of downlink channels from the N BSs, and/or a channel quality indicator i (CQIi). The RIi may range from 0 to Lmax and Lmax is a maximum number of layers which the UE is able to receive.

主权项

1. A method for reporting a downlink channel state to a serving Base Station (BS) at a User Equipment (UE) in a wireless communication system in which each of N (N is an integer equal to or larger than 2) BSs transmits one or more independent layers to the UE, the method comprising:
receiving configuration information about a channel state information reference signal (CSI-RS) process including CSI-RS resource i (i=0, . . . , N−1) and one channel state information interference measurement (CSI-IM) resource, the CSI-RS resource i being allocated to a BS i from among the N BSs; performing channel measurement in the CSI-RS resource i to measure downlink channel Hi from the BS i; and transmitting, to the serving BS, a channel state report including a precoding matrix index i (PMIi) and a rank indicator i (RIi), which maximize throughput of downlink channels from the N BSs, and/or a channel quality indicator i (CQIi), wherein the RIi ranges from 0 to Lmax and Lmax is a maximum number of layers which the UE is able to receive.