Focused assistance data for WiFi access points and femtocells
First Claim
1. A method in a mobile device for determining a position fix in a wireless network, the method comprising:
- determining a first position fix of the mobile device;
receiving, at the mobile device, a linked database from a location server, wherein the linked database is in response to the first position fix of the mobile device, comprising a first set of access points associated with the first position fix of the mobile device, and whereinthe linked database provides links associating access points in the first set of access points with corresponding sets of access points, wherein an at least one link to a corresponding set of access points indicates access points that are visible, for determining a second position fix, utilizing at least one radio frequency (RF) scan conducted in a coverage area of an associated access point in the first set of access points;
searching for access points in the first set of access points utilizing at least one radio frequency (RF) scan conducted in the coverage area of a first access point in the first set of access points; and
discovering for position determination a second set of access points based on the first access point that is visible and the at least one link between the first access point and the corresponding set of access points associated with the first access point provided in the linked database, and wherein the second position fix for the mobile device is determined using the second set of access points.
1 Assignment
0 Petitions
Accused Products
Abstract
Systems, apparatus and methods for reducing a long list of access points (APs) to a short list of access points are presented. Advantageously, a mobile device only need to search for access points on the short list thereby more quickly discovering access points, saving battery power, determining a position fix based on the discovered access points, and reducing a time to fix. Embodiments enable a mobile device to determine which access points should be detectable at a new location of the mobile device. Various embodiments comprise: (1) a linked database; (2) a grouped database; (3) an associated database; and (4) database feedback.
19 Citations
21 Claims
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1. A method in a mobile device for determining a position fix in a wireless network, the method comprising:
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determining a first position fix of the mobile device; receiving, at the mobile device, a linked database from a location server, wherein the linked database is in response to the first position fix of the mobile device, comprising a first set of access points associated with the first position fix of the mobile device, and wherein the linked database provides links associating access points in the first set of access points with corresponding sets of access points, wherein an at least one link to a corresponding set of access points indicates access points that are visible, for determining a second position fix, utilizing at least one radio frequency (RF) scan conducted in a coverage area of an associated access point in the first set of access points; searching for access points in the first set of access points utilizing at least one radio frequency (RF) scan conducted in the coverage area of a first access point in the first set of access points; and discovering for position determination a second set of access points based on the first access point that is visible and the at least one link between the first access point and the corresponding set of access points associated with the first access point provided in the linked database, and wherein the second position fix for the mobile device is determined using the second set of access points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A mobile device for determining a position fix in a wireless network, the mobile device comprising:
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a wireless transceiver configured to receive a linked database from a location server, wherein the linked database is in response to a first position fix of the mobile device, comprising a first set of access points associated with the first position fix of the mobile device, and wherein the linked database provides links associating access points in-the first set of access points with corresponding sets of access points, wherein an at least one link to a corresponding set of access points indicates access points that are visible, for determining a second position fix, utilizing at least one radio frequency (RF) scan conducted in a coverage area of an associated access point in the first set of access points; and a processor coupled to the wireless transceiver and configured to determine the second position fix of the mobile device and configured to search for access points in the first set of access points utilizing at least one radio frequency (RF) scan conducted in the coverage area of a first access point in the first set of access points, and discover for position determination a second set of access points based on the first access point that is visible and the at least one link between the first access point and the corresponding set of access points associated with the first access point provided in the linked database, and wherein the second position fix for the mobile device is determined using the second set of access points. - View Dependent Claims (16, 17, 18)
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19. A mobile device for determining a position fix in a wireless network, the mobile device comprising:
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means for determining a first position fix of the mobile device; means for receiving, at the mobile device, a linked database from a location server, wherein the linked database is in response to the first position fix of the mobile device, comprising a first set of access points associated with the first position fix of the mobile device, wherein the linked database provides links associating access points in the first set of access points with corresponding sets of access points, wherein an at least one link to a corresponding set of access points indicates access points that are visible, for determining a second position fix, utilizing at least one radio frequency (RF) scan conducted in a coverage area of an associated access point in the first set of access points; and means for searching for access points in the first set of access points utilizing at least one radio frequency (RF) scan conducted in the coverage area of a first access point in the first set of access points; and means for discovering for position determination a second set of access points based on the first access point that is visible and the at least one link between the first access point and the corresponding set of access points associated with the first access point provided in the linked database, and wherein the second position fix for the mobile device is determined using the second set of access points. - View Dependent Claims (20)
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21. A non-transitory computer-readable storage medium including program code stored thereon for a mobile device to determine a position fix in a wireless network, the non-transitory computer-readable storage medium comprising program code to:
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determine a first position fix of the mobile device; receive, at the mobile device, a linked database from a location server, wherein the linked database is in response to the first position fix of the mobile device, comprising a first set of access points associated with the first position fix of the mobile device, and wherein the linked database provides links associating access points in the first set of access points with corresponding sets of access points, wherein an at least one link to a corresponding set of access points indicates access points that are visible, for determining a second position fix, utilizing at least one radio frequency (RF) scan conducted in a coverage area of an associated access point in the first set of access points; and search for access points in the first set of access points utilizing at least one radio frequency (RF) scan conducted in the coverage area of a first access point in the first set of access points; and discover for position determination a second set of access points based on the first access point that is visible and the at least one link between the first access point and the corresponding set of access points associated with the first access point provided in the linked database, and wherein the second position fix for the mobile device is determined using the second set of access points.
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Specification