Patent ID: 9264915
Filing Date: 2016-02-16
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method for transmitting channel status information (CSI) by a User Equipment (UE) in a wireless communication system, comprising: determining signal characteristics and interference characteristics in a virtual reference resource for calculation of the CSI; determining the CSI using the determined signal characteristics and interference characteristics; and transmitting the CSI in a subframe n to an eNodeB (eNB), wherein the virtual reference resource is present in a subframe n−k (k≧4), wherein the determining signal characteristics includes determining whether the subframe n−k to which the virtual reference resource is set includes a valid downlink subframe or an invalid downlink subframe, wherein the signal characteristics are determined from a signal measurement result through the virtual reference resource when the subframe n−k is determined to be the valid downlink subframe or an average of measurement results of previously received reference signals when the subframe n−k is determined to be the invalid downlink subframe, wherein the interference characteristics are determined from a result of interference measurement in the virtual reference resource when the subframe n−k is determined to be the valid downlink subframe or an average of measurement results of previously set interference measurement resources when the subframe n−k is determined to be the invalid downlink subframe, and wherein the valid downlink subframe is set for the UE, is not multicast or broadcast over a single frequency network (MBSFN) subframe in transmission modes other than a transmission mode for downlink transmission of a maximum of 8 layers, does not include a downlink pilot time slot (DwPTS) field less than a predetermined length, and does not belong to a measurement gap set for the UE.