Techniques for determining vicinity information for access points using location assistance data

1. A method for obtaining assistance data corresponding to a plurality of access points (APs) at a mobile device, comprising:

receiving, at the mobile device, first assistance data from a location server, wherein the first assistance data comprises a first group data that is common among the plurality of APs, wherein the first group data is associated with a first group identifier (ID), the group ID, assigned to each AP of the plurality of APs, and wherein the first group data comprises information corresponding to a reference grid that is used in determining AP-specific information corresponding to each of the plurality of APs;

receiving, at the mobile device, the first group ID and a set of AP-specific information for at least one AP among the plurality of APs; and

determining, by the mobile device, AP vicinity information corresponding to the at least one AP based on the first group ID and the set of AP-specific information, the AP vicinity information indicating a plurality of locations relative to the at least one AP; and

receiving, at the mobile device, second assistance data corresponding to a second plurality of APs, wherein the second assistance data comprises a second group data that is common among the second plurality of APs, the second group data being associated with a second group ID, and the second plurality of APs comprising at least one of the APs in the plurality of APs, wherein the second group data comprises information corresponding to a second reference grid, wherein the second reference grid is used in determining the set of AP-specific information.

2. The method of claim 1 , wherein the reference grid comprises at least one of a common grid point spacing, common grid origin, and a common grid orientation.

3. The method of claim 1 , wherein the first group data further comprises at least one of a version and a validity period.

4. A mobile device for obtaining assistance data corresponding to a plurality of access points (APs), comprising:

a communication system; and

memory, communicatively coupled to one or more processors, the one or more processors configured to:

receive, via the communication system, first assistance data from a location server, wherein the first assistance data comprises a first group data that is common among the plurality of APs, wherein the first group data is associated with a first group identifier (ID), the group ID, assigned to each AP of the plurality of APs, and wherein the first group data comprises information corresponding to a reference grid that is used in determining AP-specific information corresponding to each of the plurality of APs;

receive, via the communication system, the first group ID and a set of AP-specific information for at least one AP among the plurality of APs;

determine AP vicinity information corresponding to the at least one AP based on the first group ID and the set of AP-specific information, the AP vicinity information indicating a plurality of locations relative to the at least one AP; and

receive, via the communication system, second assistance data corresponding to a second plurality of APs, wherein the second assistance data comprises a second group data that is common among the second plurality of APs, the second group data being associated with a second group ID, and the second plurality of APs comprising at least one of the APs in the plurality of APs, wherein the second group data comprises information corresponding to a second reference grid, wherein the second reference grid is used in determining the set of AP-specific information.

5. The device of claim 4 , wherein the reference grid comprises at least one of a common grid point spacing, common grid origin, and a common grid orientation.

6. The device of claim 4 , wherein the first group data further comprises at least one of a version and a validity period.

7. A non-transitory computer-readable medium comprising processor-executable instructions, the processor-executable instructions, when executed by the one or more processors, cause the one or more processors to:

receive, at a mobile device, first assistance data from a location server, wherein the first assistance data comprises a first group data that is common among a plurality of APs, wherein the first group data is associated with a first group identifier (ID), the group ID, assigned to each AP of the plurality of APs, and wherein the first group data comprises information corresponding to a reference grid that is used in determining AP-specific information corresponding to each of the plurality of APs;

receive, at the mobile device, the first group ID and a set of AP-specific information for at least one AP among the plurality of APs;

determine, by the mobile device, AP vicinity information corresponding to the at least one AP based on the first group ID and the set of AP-specific information, the AP vicinity information indicating a plurality of locations relative to the at least one AP; and

receive, at the mobile device, second assistance data corresponding to a second plurality of APs, wherein the second assistance data comprises a second group data that is common among the second plurality of APs, the second group data being associated with a second group ID, and the second plurality of APs comprising at least one of the APs in the plurality of APs, wherein the second group data comprises information corresponding to a second reference grid, wherein the second reference grid is used in determining the set of AP-specific information.

8. The non-transitory computer-readable medium of claim 7 , wherein the reference grid comprises at least one of a common grid point spacing, common grid origin, and a common grid orientation.

9. The non-transitory computer-readable medium of claim 7 , wherein the first group data further comprises at least one of a version and a validity period.

10. A mobile device for obtaining assistance data corresponding to a plurality of access points (APs), comprising:

means for receiving, at the mobile device, first assistance data from a location server, wherein the first assistance data comprises a first group data that is common among the plurality of APs, wherein the first group data is associated with a first group identifier (ID), the group ID, assigned to each AP of the plurality of APs, and wherein the first group data comprises information corresponding to a reference grid that is used in determining AP-specific information corresponding to each of the plurality of APs;

means for receiving, at the mobile device, the first group ID and a set of AP-specific information for at least one AP among the plurality of APs;

means for determining, by the mobile device, AP vicinity information corresponding to the at least one AP based on the first group ID and the set of AP-specific information, the AP vicinity information indicating a plurality of locations relative to the at least one AP; and

means for receiving, at the mobile device, second assistance data corresponding to a second plurality of APs, wherein the second assistance data comprises a second group data that is common among the second plurality of APs, the second group data being associated with a second group ID, and the second plurality of APs comprising at least one of the APs in the plurality of APs, wherein the second group data comprises information corresponding to a second reference grid, wherein the second reference grid is used in determining the set of AP-specific information.

11. The apparatus of claim 10 , wherein the reference grid comprises at least one of a common grid point spacing, common grid origin, and a common grid orientation.

12. The apparatus of claim 10 , wherein the first group data further comprises at least one of a version and a validity period.