Inter-cell interference coordination in a wireless communication system
First 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;
subframes of the plurality of downlink subframes belonging to the first subframe set, andsubframes of the plurality of downlink subframes belonging to the second subframe set,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, andwherein some of the plurality of downlink subframes do not belong to either of the first subframe set and the second subframe set.
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Abstract
Disclosed herein is a wireless communication system. More particularly, disclosed herein is a method and apparatus for coordinating and reducing inter-cell interference in a wireless communication system. A method of transmitting channel state information (CSI) measurement resource information by a base station includes determining first and second subframe sets, in which CSI measurement will be performed, among a plurality of downlink subframes, transmitting information indicating the first and second subframe sets to a terminal, and receiving the CSI of each of the first and second subframe sets from the terminal. A subframe belonging to the first subframe set and a subframe belonging to the second subframe set do not overlap, and some of the plurality of subframes do not belong to either of the first and second subframe sets.
16 Citations
5 Claims
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1. A method of transmitting channel state information (CSI) measurement resource information by a base station, the method comprising:
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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; subframes of the plurality of downlink subframes belonging to the first subframe set, and subframes of the plurality of downlink subframes belonging to the second subframe set, 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. - View Dependent Claims (2, 4, 5)
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3. A base station for transmitting channel state information (CSI) measurement resource information, the base station comprising:
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a reception module configured to receive an uplink signal from a terminal; a transmission module configured to transmit a downlink signal to the terminal; and a processor configured to; control the reception module to receive 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, determine, based on the ABS information, a first subframe set and a second subframe set, in which CSI measurement will be performed, among a plurality of downlink subframes, and control the transmission module to transmit, through the transmission module, information to the user equipment, the information indicating; subframes of the plurality of downlink subframes belonging to the first subframe set, and subframes of the plurality of downlink subframes belonging to the second subframe set, 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.
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Specification