Power control for reverse link
View Patent ↗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.
1. A method performed in a wireless communication system, the method comprising:
determining a first power level for one or more wireless communication devices configured for operation under a power constraint;
wherein the first power level comprises a difference between a power level of at least one of the one or more wireless communication devices under the power constraint and a second power level of the at least one of the one or more wireless communication devices independent of the power constraint;
obtaining a third power level of noise and interference signals surrounding the one or more wireless communication devices;
estimating a fourth power level by filtering the third power level;
determining a sum of the fourth power level and the first power level;
setting a dynamic threshold value that comprises a product of a static rise-over-thermal threshold value and the sum; and
setting a reverse activity bit of the wireless communication system when a Received Signal Strength Indication (RSSI) of the wireless communication system exceeds the dynamic threshold value.
2. The method of claim 1 , wherein the power constraint comprises a decreased power constraint relative to another power constraint of the wireless communication system.
3. The method of claim 1 , wherein filtering comprises tracking a ramp-up of filtered noise and interference at an onset of a burst.
4. The method of claim 1 , wherein filtering comprises providing a gradual damping of filtered noise and interference at an end of a burst.
5. The method of claim 1 , wherein filtering 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; and
issuing a power level command to at least one of the one or more wireless communication devices based on the virtual pilot SINR.
7. A non-transitory computer-readable storage medium configured to store instructions that are executable by one or more processors of a wireless communication system to perform operations comprising:
determining a first power level for one or more wireless communication devices configured for operation under a power constraint;
wherein the first power level comprises a difference between a power level of at least one of the one or more wireless communication devices under the power constraint and a second power level of the at least one of the one or more wireless communication devices independent of the power constraint;
obtaining a third power level of noise and interference signals surrounding the one or more wireless communication devices;
estimating a fourth power level by filtering the third power level;
determining a sum of the fourth power level and the first power level;
setting a dynamic threshold value that comprises a product of a static rise-over-thermal threshold value and the sum; and
setting a reverse activity bit of the wireless communication system when a Received Signal Strength Indication (RSSI) of the wireless communication system exceeds the dynamic threshold value.
8. The non-transitory computer-readable storage medium of claim 7 , wherein the power constraint comprises a decreased power constraint relative to another power constraint of the wireless communication system.
9. The non-transitory computer-readable storage medium of claim 7 , wherein filtering comprises tracking a ramp-up of filtered noise and interference at an onset of a burst.
10. The non-transitory computer-readable storage medium of claim 7 , wherein filtering comprises providing a gradual damping of filtered noise and interference at an end of a burst.
11. The non-transitory computer-readable storage medium program product of claim 7 , wherein filtering comprises using a time-based filtering function.
12. The non-transitory computer-readable storage medium program product of claim 7 , wherein the operations further comprise:
determining a virtual pilot signal-to-interference-plus-noise-ratio (SINR); and
issuing a power level command to at least one of the one or more wireless communication devices based on the virtual pilot SINR.
13. A wireless communication system comprising:
one or more processors; and
a non-transitory computer-readable storage medium configured to store instructions that are executable by the one or more processors to perform operations comprising:
determining a first power level for one or more wireless communication devices configured for operation under a power constraint;
wherein the first power level comprises a difference between a power level of at least one of the one or more wireless communication devices under the power constraint and a second power level of the at least one of the one or more wireless communication devices independent of the power constraint;
obtaining a third power level of noise and interference signals surrounding the one or more wireless communication devices;
estimating a fourth power level by filtering the third power level;
determining a sum of the fourth power level and the first power level; setting a dynamic threshold value that comprises a product of a static rise-over- thermal threshold value and the sum; and
setting a reverse activity bit of the wireless communication system when a Received Signal Strength Indication (RSSI) of the wireless communication system exceeds the dynamic threshold value.
14. The wireless communication system of claim 13 , wherein the power constraint comprises a decreased power constraint relative to another power constraint of the wireless communication system.
15. The wireless communication system of claim 13 , wherein filtering comprises tracking a ramp-up of filtered noise and interference at an onset of a burst.
16. The wireless communication system of claim 13 , wherein filtering comprises providing a gradual damping of filtered noise and interference at an end of a burst.
17. The wireless communication system of claim 13 , wherein filtering comprises using a time-based filtering function.
18. The wireless communication system of claim 13 , wherein the operations further comprise:
determining a virtual pilot signal-to-interference-plus-noise-ratio (SINR); and
issuing a power level command to at least one of the one or more wireless communication devices based on the virtual pilot SINR.