Methods and apparatus for peer discovery interference management in a wireless wide area network

• US 8,812,680 B2
• Filed: 09/14/2011
• Issued: 08/19/2014
• Est. Priority Date: 09/14/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Patil, Shailesh, Wu, Xinzhou, Wang, Hua, Li, Junyi, Richardson, Thomas J.
• Primary Examiner(s): Dalencourt, Yves
• Assistant Examiner(s): Williams, Clayton R
• Application Number:
  US13/232,193
• Publication Number:
  US 20130066966A1
• Time in Patent Office: 1,070 Days
• Field of Search: None
• US Class Current: 709/226
• CPC Class Codes: H04W 72/563 of the wireless resources
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

A method of operating a wireless device is provided in which the wireless device determines to use one grouping of peer discovery resources of a plurality of groupings of peer discovery resources based on one of a path loss or a distance to a base station. The plurality of groupings include a first grouping of resources having a first plurality of identical subsets of resources and a second grouping of resources having a second plurality of identical subsets of resources. Each of the first plurality of identical subsets of resources extends over at least one of a different time period or a different number of subcarriers than each of the second plurality of identical subsets of resources. The wireless device transmits a peer discovery signal on one subset of the identical subsets of said one grouping of peer discovery resources.

Claims

1. A method of operating a wireless device, comprising:

determining to use a first grouping of peer discovery resources of a plurality of groupings of peer discovery resources based on one of a path loss or a distance to a local base station if the path loss or the distance to the local base station is greater than a threshold and determining to use a second grouping of peer discovery resources of a plurality of groupings of peer discovery resources based on one of the path loss or the distance to the local base station if the path loss or the distance to the local base station is less than the threshold, the first grouping of peer discovery resources having a first plurality of identical subsets of resources and the second grouping of peer discovery resources having a second plurality of identical subsets of resources, each of the first plurality of identical subsets of resources extending over at least one of a different time period or a different number of subcarriers than each of the second plurality of identical subsets of resources;

wherein the first grouping of peer discovery resources or the second grouping of peer discovery resources overlaps resources of an adjacent base station; and

transmitting a peer discovery signal on one subset of the identical subsets of resources of the determined of said first grouping of peer discovery resources or said second grouping of peer discovery resources.

2. The method of claim 1, wherein each of the first plurality of identical subsets of resources extends over a different time period and a different number of subcarriers than each of the second plurality of identical subsets of resources.

3. The method of claim 2, wherein each of the first plurality of identical subsets of resources extends over a first time period and over a first number of subcarriers, each of the second plurality of identical subsets of resources extends over a second time period and over a second number of subcarriers, the first time period is less than the second time period, and the first number of subcarriers is greater than the second number of subcarriers.

4. The method of claim 1, wherein each of the first plurality of identical subsets of resources extends over a different number of subcarriers than each of the second plurality of identical subsets of resources, each of the first plurality of identical subsets of resources extends over a first number of subcarriers, each of the second plurality of identical subsets of resources extends over a second number of subcarriers, and the first number of subcarriers is greater than the second number of subcarriers.

5. The method of claim 4, wherein the determining to use said first or second grouping of peer discovery resources comprises:

determining to use resources in the first plurality of identical subsets of resources when the wireless device has a path loss or a distance to a serving base station that is greater than a first threshold; and

determining to use resources in the second plurality of identical subsets of resources when the wireless device has a path loss or a distance to the serving base station that is less than a second threshold.

6. The method of claim 4, wherein the determining to use said first or second grouping of peer discovery resources comprises:

determining to use resources in the first plurality of identical subsets of resources when the wireless device has a path loss or a distance to a neighboring base station that is less than a first threshold; and

determining to use resources in the second plurality of identical subsets of resources when the wireless device has a path loss or a distance to the neighboring base station that is greater than a second threshold.

7. An apparatus for wireless communication, comprising:

means for determining to use a first grouping of peer discovery resources of a plurality of groupings of peer discovery resources based on one of a path loss or a distance to a local base station if the path loss or the distance to the local base station is greater than a threshold and means for determining to use a second grouping of peer discovery resources of a plurality of groupings of peer discovery resources based on one of the path loss or the distance to the local base station if the path loss or the distance to the local base station is less than the threshold, the first grouping of peer discovery resources having a first plurality of identical subsets of resources and the second grouping of peer discovery resources having a second plurality of identical subsets of resources, each of the first plurality of identical subsets of resources extending over at least one of a different time period or a different number of subcarriers than each of the second plurality of identical subsets of resources;

wherein the first grouping of peer discovery resources or the second grouping of peer discovery resources overlaps resources of an adjacent base station; and

means for transmitting a peer discovery signal on one subset of the identical subsets of resources of the determined of said first grouping of peer discovery resources or said second grouping of peer discovery resources.

8. The apparatus of claim 7, wherein each of the first plurality of identical subsets of resources extends over a different time period and a different number of subcarriers than each of the second plurality of identical subsets of resources.

9. The apparatus of claim 8, wherein each of the first plurality of identical subsets of resources extends over a first time period and over a first number of subcarriers, each of the second plurality of identical subsets of resources extends over a second time period and over a second number of subcarriers, the first time period is less than the second time period, and the first number of subcarriers is greater than the second number of subcarriers.

10. The apparatus of claim 7, wherein each of the first plurality of identical subsets of resources extends over a different number of subcarriers than each of the second plurality of identical subsets of resources, each of the first plurality of identical subsets of resources extends over a first number of subcarriers, each of the second plurality of identical subsets of resources extends over a second number of subcarriers, and the first number of subcarriers is greater than the second number of subcarriers.

11. The apparatus of claim 10, wherein the means for determining to use said first or second grouping of peer discovery resources is configured to:

determine to use resources in the first plurality of identical subsets of resources when the apparatus has a path loss or a distance to a serving base station that is greater than a first threshold; and

determine to use resources in the second plurality of identical subsets of resources when the apparatus has a path loss or a distance to the serving base station that is less than a second threshold.

12. The apparatus of claim 10, wherein the means for determining to use said first or second grouping of peer discovery resources is configured to:

determine to use resources in the first plurality of identical subsets of resources when the apparatus has a path loss or a distance to a neighboring base station that is less than a first threshold; and

determine to use resources in the second plurality of identical subsets of resources when the apparatus has a path loss or a distance to the neighboring base station that is greater than a second threshold.

13. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and processing system configured to;

determine to use a first grouping of peer discovery resources of a plurality of groupings of peer discovery resources based on one of a path loss or a distance to a local base station if the path loss or the distance to the local base station is greater than a threshold and determine to use a second grouping of peer discovery resources of a plurality of groupings of peer discovery resources based on one of the path loss or the distance to the local base station if the path loss or the distance to the local base station is less than the threshold, the first grouping of peer discovery resources having a first plurality of identical subsets of resources and the second grouping of peer discovery resources having a second plurality of identical subsets of resources, each of the first plurality of identical subsets of resources extending over at least one of a different time period or a different number of subcarriers than each of the second plurality of identical subsets of resources;

wherein the first grouping of peer discovery resources or the second grouping of peer discovery resources overlaps resources of an adjacent base station; and

transmit a peer discovery signal on one subset of the identical subsets of resources of the determined of said first grouping of peer discovery resources or said second grouping of peer discovery resources.

14. The apparatus of claim 13, wherein each of the first plurality of identical subsets of resources extends over a different time period and a different number of subcarriers than each of the second plurality of identical subsets of resources.

15. The apparatus of claim 14, wherein each of the first plurality of identical subsets of resources extends over a first time period and over a first number of subcarriers, each of the second plurality of identical subsets of resources extends over a second time period and over a second number of subcarriers, the first time period is less than the second time period, and the first number of subcarriers is greater than the second number of subcarriers.

16. The apparatus of claim 13, wherein each of the first plurality of identical subsets of resources extends over a different number of subcarriers than each of the second plurality of identical subsets of resources, each of the first plurality of identical subsets of resources extends over a first number of subcarriers, each of the second plurality of identical subsets of resources extends over a second number of subcarriers, and the first number of subcarriers is greater than the second number of subcarriers.

17. The apparatus of claim 16, wherein to determine to use said first or second grouping of peer discovery resources, the processing system is configured to:

determine to use resources in the first plurality of identical subsets of resources when the apparatus has a path loss or a distance to a serving base station that is greater than a first threshold; and

determine to use resources in the second plurality of identical subsets of resources when the apparatus has a path loss or a distance to the serving base station that is less than a second threshold.

18. The apparatus of claim 16, wherein to determine to use said first or second grouping of peer discovery resources, the processing system is configured to:

determine to use resources in the first plurality of identical subsets of resources when the apparatus has a path loss or a distance to a neighboring base station that is less than a first threshold; and

determine to use resources in the second plurality of identical subsets of resources when the apparatus has a path loss or a distance to the neighboring base station that is greater than a second threshold.

19. A computer program product in a wireless device, comprising:

a non-transitory computer-readable medium storing code for;

determining to use a first grouping of peer discovery resources of a plurality of groupings of peer discovery resources based on one of a path loss or a distance to a local base station if the path loss or the distance to the local base station is greater than a threshold and determining to use a second grouping of peer discovery resources of a plurality of groupings of peer discovery resources based on one of the path loss or the distance to the local base station if the path loss or the distance to the local base station is less than the threshold, the first grouping of peer discovery resources having a first plurality of identical subsets of resources and the second grouping of peer discovery resources having a second plurality of identical subsets of resources, each of the first plurality of identical subsets of resources extending over at least one of a different time period or a different number of subcarriers than each of the second plurality of identical subsets of resources;

wherein the first grouping of peer discovery resources or the second grouping of peer discovery resources overlaps resources of an adjacent base station; and

transmitting a peer discovery signal on one subset of the identical subsets of resources of the determined of said first grouping of peer discovery resources or said second grouping of peer discovery resources, wherein a processor executes the code.

20. The computer program product of claim 19, wherein each of the first plurality of identical subsets of resources extends over a different time period and a different number of subcarriers than each of the second plurality of identical subsets of resources.

21. The computer program product of claim 20, wherein each of the first plurality of identical subsets of resources extends over a first time period and over a first number of subcarriers, each of the second plurality of identical subsets of resources extends over a second time period and over a second number of subcarriers, the first time period is less than the second time period, and the first number of subcarriers is greater than the second number of subcarriers.

22. The computer program product of claim 19, wherein each of the first plurality of identical subsets of resources extends over a different number of subcarriers than each of the second plurality of identical subsets of resources, each of the first plurality of identical subsets of resources extends over a first number of subcarriers, each of the second plurality of identical subsets of resources extends over a second number of subcarriers, and the first number of subcarriers is greater than the second number of subcarriers.

23. The computer program product of claim 22, wherein the determining to use said first or second grouping of peer discovery resources comprises:

determining to use resources in the first plurality of identical subsets of resources when the wireless device has a path loss or a distance to a serving base station that is greater than a first threshold; and

determining to use resources in the second plurality of identical subsets of resources when the wireless device has a path loss or a distance to the serving base station that is less than a second threshold.

24. The computer program product of claim 22, wherein the determining to use said first or second grouping of peer discovery resources comprises:

determining to use resources in the first plurality of identical subsets of resources when the wireless device has a path loss or a distance to a neighboring base station that is less than a first threshold; and

determining to use resources in the second plurality of identical subsets of resources when the wireless device has a path loss or a distance to the neighboring base station that is greater than a second threshold.