POWER CONTROL FOR REVERSE LINK

• US 20100167777A1
• Filed: 12/30/2008
• Published: 07/01/2010
• Est. Priority Date: 12/30/2008
• Status: Abandoned Application

• Current Assignee: Airvana Corporation (CommScope Holding Company, Inc.)
• Original Assignee: Airvana Incorporated (CommScope Holding Company, Inc.)
• Inventors: Raghothaman, Balaji, Humblet, Pierre A.
• Application Number:
  US12/346,272
• Publication Number:
  US 20100167777A1
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level

Abstract

A method performed in a wireless communication system having radio frequency burst transmission interference is presented. The method includes obtaining a first power level of noise and interference signals in an environment of at least one of a plurality of wireless communication devices serviced by an access point; and estimating a second power level by filtering the first power level.

Claims

1. A method performed in a wireless communication system having radio frequency burst transmission interference, the method comprising:

obtaining a first power level of noise and interference signals in an environment of at least one of a plurality of wireless communication devices serviced by an access point; and

estimating a second power level by filtering the first power level.

2. The method of claim 1, wherein the first power level comprises a difference between a Received Signal Strength Indication (RSSI) and a sum of received power level of all wireless communication devices serviced by the access point.

3. The method of claim 1, wherein filtering the first power level comprises tracking a ramp-up of filtered noise and interference at an onset of a burst.

4. The method of claim 1, wherein filtering the first power level comprises providing a gradual damping of filtered noise and interference at the end of a burst.

5. The method of claim 1, wherein filtering the first power level comprises using a time-based filtering function.

6. The method of claim 1, further comprising:

determining a virtual pilot signal-to-interference-plus-noise-ratio (SINR) of the wireless communication system based on the second power level; and

issuing a power level command to at least one of the plurality of wireless communication devices based on the virtual pilot SINR.

7. A method performed in a wireless communication system, the method comprising:

determining a first power level for one or more wireless communication devices served by an access point and operating under a minimum power constraint, the first power level being a difference between a received power level from at least one wireless communication device and a second power level that would be received if the at least one wireless communication device were not under a minimum power constraint.

8. The method of claim 7, further comprising:

obtaining a third power level of noise and interference signals in the environment of the one or more wireless communication devices serviced by the access point; and

estimating a fourth power level by filtering the third power level.

9. The method of claim 8, further comprising:

determining a sum of the fourth power level and the first power levels of all the wireless communication devices serviced by the access point;

setting a dynamic threshold value that is a product of a static rise-over-thermal threshold value and the sum; and

setting a reverse activity bit when a Received Signal Strength Indication (RSSI) exceeds the dynamic threshold value.

10. A computer program product, encoded on a computer-readable medium, operable to cause data processing apparatus to perform operations comprising:

obtaining a first power level of noise and interference signals in an environment of at least one of a plurality of wireless communication devices serviced by an access point; and

estimating a second power level by filtering the first power level.

11. The computer program product of claim 10, wherein the first power level comprises a difference between a Received Signal Strength Indication (RSSI) and a sum of received power level of all wireless communication devices serviced by the access point.

12. The computer program product of claim 10, wherein filtering the first power level comprises tracking a ramp-up of filtered noise and interference at an onset of a burst.

13. The computer program product of claim 10, wherein filtering the first power level comprises providing a gradual damping of filtered noise and interference at the end of a burst.

14. The computer program product of claim 10, wherein filtering the first power level comprises using a time-based filtering function.

15. The computer program product of claim 10, further comprising:

determining a virtual pilot signal-to-interference-plus-noise-ratio (SINR) of the wireless communication system based on the second power level; and

issuing a power level command to at least one of the plurality of wireless communication devices based on the virtual pilot SINR.

16. A computer program product, encoded on a computer-readable medium, operable to cause data processing apparatus to perform operations comprising:

determining a first power level for one or more wireless communication devices served by an access point and operating under a minimum power constraint, the first power level being a difference between a received power level from at least one wireless communication device and a second power level that would be received if the at least one wireless communication device were not under a minimum power constraint.

17. The computer program product of claim 16, further comprising:

obtaining a third power level of noise and interference signals in the environment of the one or more wireless communication devices serviced by the access point; and

estimating a fourth power level by filtering the third power level.

18. The computer program product of claim 16, further comprising:

determining a sum of the fourth power level and the first power levels of all the wireless communication devices serviced by the access point;

setting a dynamic threshold value that is a product of a static rise-over-thermal threshold value and the sum; and

setting a reverse activity bit when a Received Signal Strength Indication (RSSI) exceeds the dynamic threshold value.