Granted Patent B2

US 9,084,205 · App. 12/741,774 · Granted Jul 14, 2015

Inventors: Sophie Vrzic (Nepean, CA); Mo-Han Fong (Ottawa, CA)

Assignee: RPX Clearinghouse LLC

H04W52/243H04W52/146H04W52/367H04W52/365

Abstract

Claims (73)

1. A method of operating a subscribing station located within a serving sector of a cell within a wireless network, comprising:

obtaining at least one interference parameter for each of one or more neighboring sectors of the serving sector by obtaining an interference parameter that is an interference threshold for each of the one or more neighboring sectors; and

controlling a maximum transmit power of the subscribing station based on the at least one interference parameter for each of the one or more neighboring sectors by:

controlling the maximum transmit power of the subscribing station based on the interference parameter for each of the one or more neighboring sectors;

determining an estimated received power to the neighboring sector for each neighboring sector of the one or more neighboring sectors;

determining whether the interference threshold is greater than the estimated received power for the neighboring sector for each neighboring sector of the one or more neighboring sectors;

if the interference threshold for at least one neighboring sector of the one or more neighboring sectors is not greater than the estimated received power for the at least one neighboring sector, decreasing the maximum transmit power as compared to a standard maximum transmit power;

determining a power headroom of the subscribing station based on the maximum transmit power as controlled based on the interference parameter for each of the one or more neighboring sectors; and

reporting the power headroom of the subscribing station to a base station for the cell in which the subscribing station is located, wherein the base station allocates resources to the subscribing station based on the power headroom.

2. The method of claim 1 wherein the interference threshold for only one neighboring sector of the one or more neighboring sectors is not greater than the estimated received power for the one neighboring sector, and decreasing the maximum transmit power as compared to the standard maximum transmit power comprises:

determining a difference value between the estimated received power for the one neighboring sector and the interference threshold for the one neighboring sector; and

subtracting the difference value from the standard maximum transmit power to provide the maximum transmit power of the subscribing station.

3. The method of claim 1 wherein the interference threshold is not greater than the estimated received power for two or more neighboring sectors of the one or more neighboring sectors, and decreasing the maximum transmit power as compared to the standard maximum transmit power comprises:

determining a difference value between the estimated received power and the interference threshold for each of the two or more neighboring sectors;

identifying a maximum difference value from the difference values for the two or more neighboring sectors; and

subtracting the maximum difference value from the standard maximum transmit power to provide the maximum transmit power of the subscribing station.

4. The method of claim 1 wherein controlling the maximum transmit power of the subscribing station further comprises providing the standard maximum transmit power as the maximum transmit power of the subscribing station if, for each of the one or more neighboring sectors, the interference threshold is greater than the estimated received power.

5. The method of claim 1 wherein the one or more neighboring sectors are one of a group consisting of: all inter-cell neighboring sectors of the serving sector, a subset of all inter-cell neighboring sectors of the serving sector, all inter-cell and intra-cell neighboring sectors of the serving sector, and a subset of all inter-cell and intra-cell neighboring sectors of the serving sector.

6. The method of claim 1 wherein the at least one interference parameter for each of the one or more neighboring sectors is adaptively controlled.

7. A method of operating a subscribing station located within a serving sector of a cell within a wireless network, comprising:

obtaining at least one interference parameter that is an interference threshold for each of one or more neighboring sectors of the serving sector wherein a bandwidth in the serving sector and the one or more neighboring sectors is divided into a plurality of frequency zones, and obtaining the at least one interference parameter for each of the one or more neighboring sectors comprises, for each frequency zone of the plurality of frequency zones, obtaining an interference parameter for the frequency zone from at least one neighboring sector of the one or more neighboring sectors;

controlling a maximum transmit power of the subscribing station based on the at least one interference parameter for each of the one or more neighboring sectors by determining an estimated received power to the neighboring sector for each neighboring sector of the one or more neighboring sectors and, for each frequency zone of the plurality of frequency zones:

controlling the maximum transmit power of the subscribing station for the frequency zone based on the interference parameter for the frequency zone from each of the at least one neighboring sectors for which an interference parameter for the frequency zone has been obtained;

for each neighboring sector of the at least one neighboring sector for which an interference threshold for the frequency zone has been obtained, determining whether the interference threshold for the neighboring sector for the frequency zone is greater than the estimated received power for the neighboring sector;

if the interference threshold for the frequency zone is not greater than the estimated received power for at least one of the at least one neighboring sector, decreasing the maximum transmit power for the frequency zone as compared to a standard maximum transmit power;

providing the standard maximum transmit power as the maximum transmit power of the subscribing station for the frequency zone if, for each of the at least one neighboring sector for which an interference threshold for the frequency zone has been obtained, the interference threshold is greater than the estimated received power.

8. The method of claim 7 wherein the interference threshold for the frequency zone is not greater than the estimated received power for only one neighboring sector of the at least one neighboring sector, and decreasing the maximum transmit power for the frequency zone as compared to the standard maximum transmit power comprises:

determining a difference value between the estimated received power for the one neighboring sector and the interference threshold for the frequency zone for the one neighboring sector; and

subtracting the difference value from the standard maximum transmit power to provide the maximum transmit power of the subscribing station for the frequency zone.

9. The method of claim 7 wherein the interference threshold for the frequency zone is not greater than the estimated received power for two or more neighboring sectors of the at least one neighboring sector, and decreasing the maximum transmit power for the frequency zone as compared to the standard maximum transmit power comprises:

determining a difference value between the estimated received power and the interference threshold for the frequency zone for each of the two or more neighboring sectors;

identifying a maximum difference value from the difference values for the two or more neighboring sectors; and

subtracting the maximum difference value from the standard maximum transmit power to provide the maximum transmit power of the subscribing station for the frequency zone.

10. The method of claim 7 wherein the maximum transmit power for at least one frequency zone of the plurality of frequency zones is different than the maximum power for at least one other frequency zone of the plurality of frequency zones.

11. The method of claim 7 further comprising:

for each frequency zone of the plurality of frequency zones, determining a power headroom of the subscribing station for the frequency zone based on the maximum transmit power of the subscribing station for the frequency zone; and

reporting the power headroom of the subscribing station for each of the plurality of frequency zones to a base station for the cell in which the subscribing station is located, wherein the base station selects a frequency zone for the subscribing station based on the power headroom of the subscribing station for each of the plurality of frequency zones to provide a selected frequency zone and allocates resources to the subscribing station based on the power headroom of the subscribing station for the selected frequency zone.

12. A method of operating a subscribing station located within a serving sector of a cell within a wireless network, comprising:

obtaining at least one interference parameter for each of one or more neighboring sectors of the serving sector by obtaining an interference parameter for the frequency zone from at least one neighboring sector of the one or more neighboring sectors, wherein:

a bandwidth in the serving sector and the one or more neighboring sectors is divided into a plurality of frequency zones;

for each sector, one frequency zone of the plurality of frequency zones is an unrestricted frequency zone and other frequency zones of the plurality of frequency zones are restricted frequency zones; and

each sector of the serving sector and the one or more neighboring sectors uses a different frequency zone of the plurality of frequency zones as the unrestricted frequency zone of the sector;

controlling a maximum transmit power of the subscribing station based on the at least one interference parameter for each of the one or more neighboring sectors by:

providing a standard maximum transmit power as the maximum transmit power for the subscribing station for the unrestricted frequency zone of the serving sector; and

for each restricted frequency zone of the serving sector, controlling the maximum transmit power of the subscribing station for the restricted frequency zone based on the interference parameter for the restricted frequency zone from each of the at least one neighboring sector for which an interference parameter for the restricted frequency zone has been obtained.

13. The method of claim 12 wherein the interference parameter for each of the one or more neighboring sectors is an interference threshold, and for each restricted frequency zone of the serving sector, controlling the maximum transmit power of the subscribing station for the restricted frequency zone comprises:

for each neighboring sector of the one or more neighboring sectors, determining an estimated received power to the neighboring sector;

for each neighboring sector of the at least one neighboring sector for which an interference threshold for the restricted frequency zone has been obtained, determining whether the interference threshold for the neighboring sector for the restricted frequency zone is greater than the estimated received power for the neighboring sector; and

if the interference threshold for the restricted frequency zone is not greater than the estimated received power for at least one of the at least one neighboring sector, decreasing the maximum transmit power for the restricted frequency zone as compared to the standard maximum transmit power.

14. The method of claim 13 wherein the interference threshold for the restricted frequency zone is not greater than the estimated received power for two or more neighboring sectors of the at least one neighboring sector, and decreasing the maximum transmit power for the restricted frequency zone as compared to the standard maximum transmit power comprises:

determining a difference value between the estimated received power and the interference threshold for the restricted frequency zone for each of the two or more neighboring sectors;

identifying a maximum difference value from the difference values for the two or more neighboring sectors; and

subtracting the maximum difference value from the standard maximum transmit power to provide the maximum transmit power of the subscribing station for the restricted frequency zone.

15. The method of claim 13 wherein controlling the maximum transmit power of the subscribing station for the restricted frequency zone further comprises providing the standard maximum transmit power as the maximum transmit power of the subscribing station for the restricted frequency zone if, for each of the at least one neighboring sector for which an interference threshold for the restricted frequency zone has been obtained, the interference threshold is greater than the estimated received power.

16. The method of claim 13 wherein the interference threshold for the restricted frequency zone is not greater than the estimated received power for only one neighboring sector of the at least one neighboring sector, and decreasing the maximum transmit power for the restricted frequency zone as compared to the standard maximum transmit power comprises:

determining a difference value between the estimated received power for the one neighboring sector and the interference threshold for the restricted frequency zone for the one neighboring sector; and

subtracting the difference value from the standard maximum transmit power to provide the maximum transmit power of the subscribing station for the restricted frequency zone.

17. The method of claim 12 wherein the maximum transmit power for the serving sector for at least one frequency zone of the plurality of frequency zones is different than the maximum transmit power for the serving sector for at least one other frequency zone of the plurality of frequency zones.

18. The method of claim 12 further comprising:

for each frequency zone of the plurality of frequency zones, determining a power headroom of the subscribing station for the frequency zone based on the maximum transmit power of the subscribing station for the frequency zone; and

reporting the power headroom of the subscribing station for each of the plurality of frequency zones to a base station for the cell in which the subscribing station is located, wherein the base station selects a frequency zone for the subscribing station based on the power headroom of the subscribing station for each of the plurality of frequency zones to provide a selected frequency zone and allocates resources to the subscribing station based on the power headroom of the subscribing station for the selected frequency zone.

19. The method of claim 18 wherein in order to select the frequency zone for the subscribing station, the base station determines whether the subscribing station is a cell edge subscribing station based on the power headroom of the subscribing station for each of the plurality of frequency zones and selects the unrestricted frequency zone for the subscribing station if the subscribing station is determined to be a cell edge subscribing station.

20. A subscribing station adapted to be used within a serving sector of a cell within a wireless network, comprising:

a wireless communication interface adapted to communicatively couple the subscribing station to the wireless network; and

a control system associated with the wireless communication interface and adapted to:

obtain at least one interference parameter for each of one or more neighboring sectors of the serving sector by obtaining an interference parameter that is an interference threshold for each of the one or more neighboring sectors; and

control a maximum transmit power of the subscribing station based on the at least one interference parameter for each of the one or more neighboring sectors by:

controlling the maximum transmit power of the subscribing station based on the interference parameter for each of the one or more neighboring sectors;

determining an estimated received power to the neighboring sector for each neighboring sector of the one or more neighboring sectors;

determining whether the interference threshold is greater than the estimated received power for the neighboring sector for each neighboring sector of the one or more neighboring sectors;

if the interference threshold for at least one neighboring sector of the one or more neighboring sectors is not greater than the estimated received power for the at least one neighboring sector, decreasing the maximum transmit power as compared to a standard maximum transmit power; and

determining a power headroom of the subscribing station based on the maximum transmit power as controlled based on the interference parameter for each of the one or more neighboring sectors; and

reporting the power headroom of the subscribing station to a base station for the cell in which the subscribing station is located, wherein the base station allocates resources to the subscribing station based on the power headroom.

Assignments (10)

Continuity (2)