INTER-CELL INTERFERENCE RELIEF METHOD

• US 20100279619A1
• Filed: 01/16/2009
• Published: 11/04/2010
• Est. Priority Date: 01/16/2008
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute, Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Song, Young Seog, Kim, Ji Hyung, Lee, Seung Joon, Kwak, Byung-Jae, Yeh, Choong Il, Kwon, Dong Seung
• Granted Patent: US 8,805,283 B2
• Time in Patent Office: Days
• US Class Current: 455/63.1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022

Abstract

In a method of mitigating inter-cell interference, terminals are grouped into groups. A base station transmits data to a first terminal belonging to a first group among the groups, without cooperation with a neighboring base station. The base station transmits data to a second terminal belonging to a second group among the groups, through cooperation with the neighboring base station.

Claims

1. A method of mitigating inter-cell interference in a base station, the method comprising:

grouping a plurality of terminals into a plurality of groups;

transmitting first data to a first terminal belonging to a first group among the plurality of groups without cooperation with a neighboring base station; and

transmitting second data to a second terminal belonging to a second group among the plurality of groups through cooperation with the neighboring base station.

2. The method of claim 1, wherein the transmitting of the second data comprises transmitting the second data using the same resource as a resource of the neighboring base station, and

the second data is the same as data transmitted by the neighboring base station.

3. The method of claim 2, wherein the transmitting of the second data transmits the second data using a space time code (STC) scheme using beamforming through cooperation with the neighboring base station.

4. The method of claim 1, further comprising transmitting third data to a third terminal belonging to the second group among the plurality of groups through cooperation with another neighboring base station,

wherein the base station transmits the second data and the third data using the same resource and different beams.

5. The method of claim 1, further comprising transmitting fourth data to a fourth terminal belonging to the second group using a beamforming scheme without cooperation with the neighboring base station, while the neighboring base station transmits third data to a third terminal belonging to the second group using the beamforming scheme.

6. The method of claim 1, further comprising:

transmitting third data to a third terminal belonging to a third group among the plurality of groups through cooperation with the neighboring base station; and

transmitting fourth data to a fourth terminal belonging to the third group among the plurality of groups through cooperation with the neighboring base station, using a second resource that is different from a first resource, while transmitting the third data using the first resource.

7. The method of claim 1, further comprising distributing a resource in at least one direction of a time direction and a frequency direction to allocate the distributed resource to each of the groups.

8. The method of claim 1, further comprising receiving feedback information from each of the terminals,

wherein the grouping comprises grouping the plurality of terminals into the plurality of groups based on the feedback information.

9. The method of claim 8, further comprising sharing the feedback information with the neighboring base station.

10. The method of claim 8, wherein the feedback information received from each of the terminals includes a signal to interference plus noise ratio (SINR), and information on a preferred beam among a plurality of beams of a serving base station.

11. The method of claim 10, wherein the feedback information includes at least one of an index of an interference cell and an interference beam index of the interference cell.

12. The method of claim 10, wherein an SINR of the first group is higher than an SINR of the second group.

13. A method of mitigating inter-cell interference in a terminal, the method comprising:

transmitting feedback information to a serving base station;

receiving first data from the serving base station without cooperation with a neighboring base station, when the terminal belongs to a first group based on the feedback information; and

receiving second data through cooperation between the serving base station and the neighboring base station, when the terminal belongs to a second group based on the feedback information.

14. The method of claim 13, wherein the receiving of the second data comprises receiving the second data that is transmitted using the same resource at the serving base station and the neighboring base station.

15. The method of claim 13, wherein the same resource is the same as a resource that another terminal belonging to the second group uses to receive data while the terminal receives the second data.

16. The method of claim 13, wherein the same resource is different from a resource that another terminal belonging to the second group uses to receive data while the terminal receives the second data.

17. The method of claim 13, wherein the feedback information includes at least one of an SNIR, information on a preferred beam among a plurality of beams of the serving base station, and information on an interference cell.

18. The method of claim 17, wherein an SINR of the first group is higher than an SINR of the second group.

19. A method of mitigating inter-cell interference at a base station, the method comprising:

grouping a plurality of terminals into a plurality of groups;

not applying a network multiple input multiple output (MIMO) scheme to a terminal belonging to a first group among the plurality of groups; and

applying, to a terminal belonging to a second group among the plurality of groups, the network MIMO scheme through cooperation with a neighboring base station.

20. The method of claim 19, further comprising applying, to a terminal belonging to a third group among the plurality of groups, a fractional frequency reuse (FFR) scheme and the network MIMO scheme through cooperation with the neighboring base station.

21. The method of claim 19, further comprising receiving feedback information from each of the terminals,

wherein the grouping comprises grouping the plurality of terminals into the plurality of groups based on the feedback information, and

the feedback information includes at least one of an SINR, information on a preferred beam among a plurality of beams of the base station, and information on an interference cell.