Method and apparatus for inter-cell interference cancellation in wireless communication system
The present invention relates to a method and an apparatus for transmitting information among base stations for inter-cell interference cancellation in a massive MIMO or FD-MIMO system. A base station acquires interference area information, which is information on an area causing interference to a neighbor base station, and transmits the interference area information to the neighbor base station. The interference area information may include any one from among the vertical and horizontal angles of a beam causing interference to the neighbor base station, or the number of the area causing interference to the neighbor base station.
1. A method of transmitting, by a base station to a neighboring base station, interference area information regarding an area causing interference within a coverage of the neighboring base station, the method comprising:
receiving, by the base station, information on an index number of areas operated by the neighboring base station;
determining, by the base station, information on vertical and horizontal angles of a beam causing interference to the neighboring base station;
determining information on index number of interfered area by mapping the information on the index number of areas operated by the neighboring base station to the information on vertical and horizontal angles to be used for beamforming; and
transmitting, by the base station to the neighboring base station, the interference area information including the information on index number of interfered area.
2. The method of claim 1 , wherein the neighboring base station schedules a user equipment within the coverage of the neighboring base station, based on the interference area information.
3. The method of claim 1 , wherein the interference area information is transmitted by being included in a load information message or another message.
4. The method of claim 1 , further comprising:
transmitting height information of the base station and distance information (ISD; Inter Site Distance) between the base station and the neighboring base station.
5. The method of claim 4 , wherein the height information of the base station and the distance information between the base station and the neighboring base station are transmitted upon X2 setup.
6. The method of claim 1 , wherein the information on the vertical and horizontal angles of the beam includes at least one of a center value of main lobe of the beam, a range value according to beam width, or a range value which represents width of one binding beam allocated to a UE and closest beams thereto.
7. The method of claim 1 , wherein the interference area information is transmitted per a PRB or per the interfered area, or the interference area information is transmitted by including information on areas with the greatest interference within the coverage.
8. The method of claim 1 , wherein the information on index number of interfered area represents an index number of an area causing interference to the neighboring base station among the index number of areas operated by the neighboring base station.
9. The method of claim 8 ,
wherein the information on an index number of areas operated by the neighboring base station is received from operations, administration and maintenance (OAM).
10. The method of claim 8 , wherein the information on an index number of areas operated by the neighboring base station is received via an X2 setup request message or an X2 setup response message.
11. A base station for transmitting, to a neighboring base station, interference area information regarding an area causing interference within a coverage of the neighboring base station, the base station comprising:
a memory;
a transceiver configured to receive information on an index number of areas operated by the neighboring base station; and
a processor, connected with the memory and the transceiver, and configured to:
determine information on vertical and horizontal angles of a beam causing interference to the neighboring base station,
determining information on index number of interfered area by mapping the information on the index number of areas operated by the neighboring base station to the information on vertical and horizontal angles to be used for beamforming; and
transmit the interference area information including the information on index number of interfered area to the neighboring base station.
12. The base station of claim 11 , wherein the information on index number of interfered area represents index number of an area causing interference to the neighboring base station among the index number of areas operated by the neighboring base station.
13. The base station of claim 11 , wherein the neighboring base station schedules a user equipment within the coverage of the neighboring base station, based on the interference area information.