Dynamic adjustment of the pilot-channel, paging-channel, and sync-channel transmission-power levels based on forward-link and reverse-link RF conditions

• US 8,145,254 B1
• Filed: 07/14/2010
• Issued: 03/27/2012
• Est. Priority Date: 03/05/2007
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Talley, Ryan S., Wurtenberger, Andrew M.
• Primary Examiner(s): TRINH, TAN H
• Application Number:
  US12/836,399
• Time in Patent Office: 622 Days
• Field of Search: 455/522, 455/69, 455/420, 455/424, 455/423, 455/450, 455/452.1, 455/452.2, 455/453, 455/464, 455/10, 455/13.4, 455/509, 455/513, 455/515, 455/67.11, 455/67.13, 455/67.16, 455/114.2, 455/115.1, 455/115.3, 455/115.4, 455/500, 455/446, 455/220, 370/252, 370/311, 370/342, 370/913, 370/335, 370/318, 370/332, 370/277, 370/320, 370/328, 370/331
• US Class Current: 455/522
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels

Abstract

Methods and systems are provided for dynamic adjustment of the pilot-channel, paging-channel, and sync-channel transmission-power levels based on forward-link and reverse-link RF conditions. In an exemplary embodiment, a base station provides service on a carrier in a wireless coverage area, and computes both an E_c/I_or value and a reverse noise rise (RNR) value for the carrier. Based at least in part on the E_c/I_or value and at least in part on the RNR value, the base station adjusts at least one of a pilot-channel power level, a paging-channel power level, and a sync-channel power level for the carrier. As an example, if (a) E_c/I_or is above a first threshold and (b) RNR is below a second threshold, the base station may increase all three of the power levels, so as to improve service quality and coverage, among other advantages.

Claims

1. A method comprising:

providing service on a carrier in a wireless coverage area;

computing an E_c/I_or value for the carrier;

computing a reverse noise rise (RNR) value for the carrier; and

adjusting all three of a pilot-channel power level for the carrier, a paging-channel power level for the carrier, and a sync-channel power level for the carrier based at least in part on the computed E_c/I_or value and at least in part on the computed RNR value.

2. The method of claim 1, carried out by at least one of a base station, a base transceiver station, a base station controller, a radio network controller, and an access node.

3. The method of claim 1, wherein the service comprises code division multiple access (CDMA) service.

4. The method of claim 1, wherein the wireless coverage area comprises at least one of a cell and a sector.

5. The method of claim 1, wherein computing the E_c/I_or value comprises computing a logarithmic ratio of a pilot-channel power level and an all-channel power level, wherein the pilot-channel power level represents power allocated to transmitting a pilot channel, and wherein the all-channel power level represents power allocated to transmitting at least the pilot channel, a paging channel, and a sync channel.

6. The method of claim 5, wherein the all-channel power level further represents power allocated to transmitting one or more traffic channels.

7. The method of claim 1, wherein computing the RNR value comprises:

measuring a current level of noise on a reverse link; and

computing the RNR value as the difference between the current level of noise on the reverse link and a baseline level of noise on the reverse link.

8. The method of claim 7, wherein the baseline level of noise on the reverse link corresponds to at least one of a minimum amount of reverse noise measured in the previous 24 hours, an average of 24-hour minimum levels of reverse noise over a previous 7-day period, and an amount of noise present when the wireless coverage area is unloaded.

9. The method of claim 1, wherein adjusting all three of the pilot-channel power level, the paging-channel power level, and the sync-channel power level based at least in part on the computed E_c/I_or value and at least in part on the computed RNR value comprises at least one of (a) comparing the computed E_c/I_or value with a forward-link radio-frequency (RF) threshold and (b) comparing the computed RNR value with a reverse-link RF threshold.

10. The method of claim 9, wherein the forward-link RF threshold is −

6 dB, and wherein the reverse-link RF threshold is 5 dB.

11. The method of claim 9, wherein adjusting all three of the pilot-channel power level, the paging-channel power level, and the sync-channel power level based at least in part on the computed E_c/I_or value and at least in part on the computed RNR value further comprises:

if (a) the computed E_c/I_or value is greater than the forward-link RF threshold and (b) the computed RNR value is less than the reverse-link RF threshold, then increasing all three of the pilot-channel power level, the paging-channel power level, and the sync-channel power level.

12. The method of claim 9, wherein adjusting all three of the pilot-channel power level, the paging-channel power level, and the sync-channel power level based at least in part on the computed E_c/I_or value and at least in part on the computed RNR value further comprises:

if (a) the computed E_c/I_or value is less than the forward-link RF threshold and (b) the computed RNR value is greater than the reverse-link RF threshold, then decreasing all three of the pilot-channel power level, the paging-channel power level, and the sync-channel power level.

13. The method of claim 1, wherein:

the pilot-channel power level, the paging-channel power level, and the sync-channel power level have a proportional relationship among each other prior to adjusting the three power levels; and

adjusting the three power levels comprises either (a) increasing all three power levels so as to maintain that proportional relationship or (b) decreasing all three power levels so as to maintain that proportional relationship.

14. The method of claim 1, carried out on a periodic basis.

15. A base station comprising:

a wireless-communication interface;

a processor; and

data storage comprising instructions executable by the processor to;

provide service on a carrier in a wireless coverage area;

compute an E_c/I_or value for the carrier;

compute a reverse noise rise (RNR) value for the carrier; and

adjust all three of a pilot-channel power level for the carrier, a paging-channel power level for the carrier, and a sync-channel power level for the carrier based at least in part on the computed E_c/I_or value and at least in part on the computed RNR value.

16. The base station of claim 15, wherein the instructions to adjust all three of the pilot-channel power level, the paging-channel power level, and the sync-channel power level based at least in part on the computed E_c/I_or value and at least in part on the computed RNR value comprise instructions to:

compare the computed E_c/I_or value with a forward-link radio-frequency (RF) threshold;

compare the computed RNR value with a reverse-link RF threshold;

if (a) the computed E_c/I_or value is greater than the forward-link RF threshold and (b) the computed RNR value is less than the reverse-link RF threshold, then increase all three of the pilot-channel power level, the paging-channel power level, and the sync-channel power level; and

if (a) the computed E_c/I_or value is less than the forward-link RF threshold and (b) the computed RNR value is greater than the reverse-link RF threshold, then decrease all three of the pilot-channel power level, the paging-channel power level, and the sync-channel power level.

17. The base station of claim 15, wherein:

the pilot-channel power level, the paging-channel power level, and the sync-channel power level have a proportional relationship among each other prior to adjusting the three power levels; and

the instructions to adjust the three power levels comprise instructions to either (a) increase all three power levels so as to maintain that proportional relationship or (b) decrease all three power levels so as to maintain that proportional relationship.