METHOD FOR CONTROLLING INTERFERENCE

• US 20100278063A1
• Filed: 04/29/2010
• Published: 11/04/2010
• Est. Priority Date: 04/29/2009
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute, Samsung Electronics Co. Ltd.
• Original Assignee: Electronics and Telecommunications Research Institute, Samsung Electronics Co. Ltd.
• Inventors: YOON, Chul Sik, CHANG, Sung Cheol, AHN, Jee Hwan, KIM, Sung Kyung, KIM, Won-Ik, KIM, Hyun-Jae
• Granted Patent: US 8,717,914 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 16/08 Load shedding arrangements
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A method for controlling interference between a plurality of neighboring base stations for a terminal by a serving base station of the terminal in a communication system is provided. The method includes receiving interference amount information on a first region of a downlink frame from the terminal, determining an interference amount estimate for the first region based on the received interference amount information, comparing the determined interference amount estimate with an interference amount tolerance for the first region; and transmitting an interference indicator requesting reduction in transmission power for the first region to the plurality of neighboring base stations when the interference amount estimate exceeds the interference amount tolerance.

Claims

1. A method for controlling interference between a plurality of neighboring base stations for a terminal by a serving base station of the terminal in a communication system that can communicate between the base stations, the method comprising:

receiving interference amount information on a first region of a downlink frame from the terminal by the serving base station;

determining an interference amount estimate for the first region by the serving base station based on the interference amount information;

comparing the interference amount estimate with an interference amount tolerance for the first region by the serving base station; and

transmitting an interference indicator requesting reduction in transmission power for the first region to the plurality of neighboring base stations by the serving base station if it is determined that the interference amount estimate exceeds the interference amount tolerance.

2. The method of claim 1, wherein the determining of the interference amount estimate comprises determining at least one of a Carrier to Interference and Noise Ratio (CINR) and a Received Signal Strength Indication (RSSI) for the first region included in the interference amount information.

3. The method of claim 2, wherein the determining of the interference amount estimate comprises determining an estimate that is in proportion to a path loss and the transmission power for the first region included in the interference amount information and in inverse proportion to the CINR.

4. The method of claim 1, further comprising:

determining a first interference amount estimate corresponding to the interference amount estimate of a first neighboring base station for the first region based on the interference amount information by the serving base station;

comparing the first interference amount estimate with the interference amount tolerance by the serving base station; and

transmitting the interference indicator to the first neighboring base station by the serving base station when the first interference amount estimate exceeds the interference amount tolerance.

5. The method of claim 4, wherein the determining of the first interference amount estimate comprises determining a ratio of an entire load of the plurality of neighboring base stations to the load of the first neighboring base station by the serving base station.

6. The method of claim 4, wherein the determining of the first interference amount estimate comprises determining an estimate that is in proportion to a path loss and the transmission power of the serving base station for the first region included in the interference amount information and in inverse proportion to a Carrier to Interference and Noise Ratio (CINR) for the first region included in the interference amount information by the serving base station.

7. The method of claim 6, wherein the determining of the first interference amount estimate further comprises determining an estimate that is in inverse proportion to a difference between the path loss of the serving base station for the first region included in the interference amount information and the path loss of the first neighboring base station for the first region by the serving base station.

8. The method of claim 1, wherein the transmitting of the interference indicator comprises:

increasing an overload indicator indicating a frequency where the interference amount estimate exceeds the interference amount tolerance when the interference amount estimate exceeds the interference amount tolerance by the serving base station; and

transmitting the interference indicator to the plurality of neighboring base stations by the serving base station when the frequency corresponding to the overload indicator exceeds a preset permissible frequency.

9. The method of claim 1, wherein the first region comprises a radio resource region that allows the serving base station the transmission power higher than remaining regions other than the first region in the downlink frame.

10. A method for controlling interference between a plurality of neighboring base stations for a terminal by a serving base station of the terminal in a communication system that cannot communicate between the base stations, the method comprising:

receiving interference amount information on a first region of a first downlink frame transmitted by the serving base station from the terminal, by the serving base station;

determining an interference amount estimate for the first region by the serving base station based on the interference amount information;

determining an interference level for the first region by the serving base station according to the interference amount estimate based on an interference amount tolerance for the first region;

determining transmission power of an interference indicator broadcasting region for the first region by the serving base station according to the interference level; and

transmitting pilot sub-carriers as the transmission power by the serving base station in the interference indicator broadcasting region.

11. The method of claim 10, wherein the determining of the interference level comprises comparing the determined interference amount estimate with an interference amount tolerance for the first region.

12. The method of claim 10, wherein the determining of the interference amount estimate comprises determining a Carrier to Interference and Noise Ratio (CINR) and a Received Signal Strength Indication (RSSI) for the first region included in the interference amount information.

13. The method of claim 11, wherein the determining of the interference amount estimate comprises determining an estimate that is in proportion to a path loss and the transmission power for the first region included in the interference amount information and in inverse proportion to the CINR by the serving base station.

14. The method of claim 10, wherein the first region comprises a radio resource region that allows the serving base station the transmission power higher than remaining regions other than the first region in the downlink frame.

15. A method for controlling interference affecting neighboring cells by a base station in a communication system that cannot communicate between the base stations, the method comprising:

determining an interference level of a first base station for a service region of a second base station according to at least one of a Carrier to Interference and Noise Ratio (CINR) and a Received Signal Strength Indication (RSSI) of a broadcasting region in a downlink frame of a second base station adjacent to the first base station;

determining transmission power for a lower region in a downlink frame of the first base station by the first base station according to the interference level; and

transmitting the lower region as the transmission power by the first base station.

16. The method of claim 15, wherein the lower region comprises a radio resource region that allows the second base station the transmission power higher than the remaining regions other than the lower region in the downlink frame of the second base station.

17. The method of claim 15, further comprising:

receiving at least one of the CINR and the RSSI in the broadcasting region from a terminal positioned in a service region of the first base station by the first base station, prior to the determining of the interference level.

18. The method of claim 15, further comprising:

measuring at least one of the CINR and the RSSI in the broadcasting region by the first base station, prior to the determining of the interference level.