Interference control in a wireless communication system

• US 8,849,210 B2
• Filed: 06/29/2012
• Issued: 09/30/2014
• Est. Priority Date: 03/15/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Mese, Murat, Sutivong, Arak, Julian, David Jonathan
• Primary Examiner(s): Lee, John J
• Application Number:
  US13/538,753
• Publication Number:
  US 20120270582A1
• Time in Patent Office: 823 Days
• Field of Search: 455/522, 455/69, 455/63.1, 455/436, 455/453, 455/446, 455/422.1, 455/452.2, 455/509, 455/67.13, 455/67.11, 455/515, 455/126, 455/501, 370/252, 370/328, 370/329, 370/234, 370/331
• US Class Current: 455/63.1
• CPC Class Codes: H04B 17/10 of transmitters
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04W 28/24 Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 92/20 between access points

Abstract

For interference control, a sector m estimates interference observed from terminals in neighbor sectors and obtains an interference estimate. Sector m may generate an over-the-air (OTA) other-sector interference (OSI) report and/or an inter-sector (IS) OSI report based on the interference estimate. Sector m may broadcast the OTA OSI report to the terminals in the neighbor sectors. These terminals may adjust their transmit powers based on the OTA OSI report. Sector m may send the IS OSI report to the neighbor sectors, receive IS OSI reports from the neighbor sectors, and regulate data transmissions for terminals in sector m based on the received IS OSI reports. Sector m may control admission of terminals to sector m, de-assign admitted terminals, schedule terminals in sector m in a manner to reduce interference to the neighbor sectors, and/or assign the terminals in sector m with traffic channels that cause less interference to the neighbor sectors.

Claims

1. A method for interference control, the method being implemented by a sector, the method comprising:

obtaining a measured interference that represents an estimate of interference observed at the sector due to transmissions from terminals in other sectors;

generating an interference report based on the measured interference, wherein the interference report conveys the measured interference for the sector relative to multiple interference thresholds; and

broadcasting the interference report to the terminals in the other sectors.

2. The method of claim 1, wherein the measured interference is a measured interference-over-thermal.

3. The method of claim 1, further comprising broadcasting interference reports received from other sectors to terminals being served by the sector.

4. A method for interference control, the method being implemented by a terminal, the method comprising:

receiving an interference report that is broadcast by a neighbor sector, wherein the interference report conveys measured interference for the neighbor sector relative to multiple interference thresholds; and

adjusting transmit power of the terminal based on the interference report.

5. The method of claim 4, further comprising:

receiving multiple interference reports from multiple neighbor sectors; and

identifying a strongest neighbor sector;

wherein the transmit power of the terminal is adjusted based only on the interference report from the strongest neighbor sector.

6. The method of claim 4, further comprising receiving multiple interference reports from multiple neighbor sectors, wherein the transmit power of the terminal is adjusted based only on the interference reports from the neighbor sectors that are included in an other-sector interference set.

7. The method of claim 6, wherein adjusting the transmit power comprises decreasing the transmit power if any neighbor sector in the other-sector interference set observes high or excessive interference.

8. The method of claim 6, wherein adjusting the transmit power comprises:

determining a transmit power adjustment for each neighbor sector in the other-sector interference set; and

combining transmit power adjustments for all neighbor sectors in the other-sector interference set to obtain an overall transmit power adjustment.

9. A sector that is configured for interference control, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable to;

obtain a measured interference that represents an estimate of interference observed at the sector due to transmissions from terminals in other sectors;

generate an interference report based on the measured interference, wherein the interference report conveys the measured interference for the sector relative to multiple interference thresholds; and

broadcast the interference report to the terminals in the other sectors.

10. The sector of claim 9, wherein the measured interference is a measured interference-over-thermal.

11. The sector of claim 9, wherein the instructions are also executable to broadcast interference reports received from other sectors to terminals being served by the sector.

12. A terminal configured for interference control, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable to;

receive an interference report that is broadcast by a neighbor sector, wherein the interference report conveys measured interference for the neighbor sector relative to multiple interference thresholds; and

adjust transmit power of the terminal based on the interference report.

13. The terminal of claim 12, wherein the instructions are also executable to receive multiple interference reports from multiple neighbor sectors and to identify a strongest neighbor sector, wherein the transmit power of the terminal is adjusted based only on the interference report from the strongest neighbor sector.

14. The terminal of claim 12, wherein the instructions are also executable to receive multiple interference reports from multiple neighbor sectors, and wherein the transmit power of the terminal is adjusted based only on the interference reports from the neighbor sectors that are included in an other-sector interference set.

15. The terminal of claim 14, wherein adjusting the transmit power comprises decreasing the transmit power if any neighbor sector in the other-sector interference set observes high or excessive interference.

16. The terminal of claim 14, wherein adjusting the transmit power comprises:

determining a transmit power adjustment for each neighbor sector in the other-sector interference set; and

combining transmit power adjustments for all neighbor sectors in the other-sector interference set to obtain an overall transmit power adjustment.

17. A sector that is configured for interference control, comprising:

means for obtaining a measured interference that represents an estimate of interference observed at the sector due to transmissions from terminals in other sectors;

means for generating an interference report based on the measured interference, wherein the interference report conveys the measured interference for the sector relative to multiple interference thresholds; and

means for broadcasting the interference report to the terminals in the other sectors.

18. A terminal that is configured for interference control, comprising:

means for receiving an interference report that is broadcast by a neighbor sector, wherein the interference report conveys measured interference for the neighbor sector relative to multiple interference thresholds; and

means for adjusting transmit power of the terminal based on the interference report.

19. The terminal of claim 18, further comprising:

means for receiving multiple interference reports from multiple neighbor sectors; and

means for identifying a strongest neighbor sector;

wherein the transmit power of the terminal is adjusted based only on the interference report from the strongest neighbor sector.

20. The terminal of claim 18, further comprising means for receiving multiple interference reports from multiple neighbor sectors, wherein the transmit power of the terminal is adjusted based only on the interference reports from the neighbor sectors that are included in an other-sector interference set.

21. A non-transitory processor-readable storage medium, comprising:

code for causing a sector to obtain a measured interference that represents an estimate of interference observed at the sector due to transmissions from terminals in other sectors;

code for causing the sector to generate an interference report based on the measured interference, wherein the interference report conveys the measured interference for the sector relative to multiple interference thresholds; and

code for causing the sector to broadcast the interference report to the terminals in the other sectors.

22. A non-transitory processor-readable storage medium, comprising:

code for causing a terminal to receive an interference report that is broadcast by a neighbor sector, wherein the interference report conveys measured interference for the neighbor sector relative to multiple interference thresholds; and

code for causing the terminal to adjust transmit power of the terminal based on the interference report.

23. The processor-readable storage medium of claim 22, further comprising:

code for causing the terminal to receive multiple interference reports from multiple neighbor sectors; and

code for causing the terminal to identify a strongest neighbor sector;

wherein the transmit power of the terminal is adjusted based only on the interference report from the strongest neighbor sector.

24. The processor-readable storage medium of claim 22, further comprising code for causing the terminal to receive multiple interference reports from multiple neighbor sectors, wherein the transmit power of the terminal is adjusted based only on the interference reports from the neighbor sectors that are included in an other-sector interference set.