Patent ID: 9525530
Filing Date: 2016-12-20
CPC Classification: H04L

Claim Text:
1. A method for feeding back channel state information (CSI) from a user equipment (UE) in a wireless communication system, the method comprising: receiving, by the UE from a base station, configuration information, a primary CSI reference signal (CSI-RS) and a secondary CSI-RS; configuring, by the UE, a common subband based on the primary CSI-RS and a combining channel quality of a subband related with both a serving cell and a first cooperative cell, wherein the first cooperative cell is configured to perform a joint transmission with the serving cell; generating, by the UE, first CSI on the configured common subband for both the serving cell and the first cooperative cell; and generating, by the UE, second CSI on an individual subband for a second cooperative cell, wherein the second CSI is generated to correspond to the secondary CSI-RS, and wherein the second cooperative cell is configured to perform a transmission different than the joint transmission.