Patent ID: 9742546
Date: 2017-08-22
CPC Classifications: H04B,H04L,H04W

Claim:
1. A method of transmitting channel state information (CSI) measurement resource information by a base station, the method comprising: receiving, by the base station, an X2 interface message from a neighbor base station, the X2 interface message including almost blank subframe (ABS) information which includes a first bitmap and a second bitmap, the first bitmap indicating a first subset of ABSs and the second bitmap indicating a second subset of ABSs of the neighbor base station among a set of subframes included in a predefined time window; determining, based on the ABS information, a first subframe set and a second subframe set, in which CSI measurement will be performed by a user equipment (UE), among a plurality of downlink subframes; and transmitting, by the base station, information to the UE, the information indicating: wherein the transmitted information identifies a subframe belonging to the first subframe set and a subframe belonging to the second subframe set using one bit having a value of 0 or 1, wherein the subframe belonging to the first subframe set and the subframe belonging to the second subframe set do not overlap, and wherein some of the plurality of downlink subframes do not belong to either of the first subframe set and the second subframe set.