Granted Patent B2

US 8,532,651 · App. 12/956,397 · Granted Sep 10, 2013

Abstract

Claims (38)

1. A method of controlling wireless communications, comprising the steps of:

providing a list of cell identifiers to a mobile station, the list comprising a target active set of a controller that indicates candidate cells for possible communication with the mobile station;

receiving an indication from the mobile station that the mobile station has detected a cell identifier on the provided list;

determining whether timing information regarding the cell corresponding to the detected cell identifier is within a predetermined acceptable range; and

allowing the cell corresponding to the detected cell identifier to remain in the target active set of the controller and to be added to an active set of the mobile station only if the determined timing information is within the predetermined acceptable range.

2. The method of claim 1 , wherein the timing information comprises a cell frame number (CFN) offset.

3. The method of claim 1 , wherein the timing information comprises a chip offset.

4. The method of claim 1 , wherein the timing information comprises a user plane timing adjustment.

5. The method of claim 1 , wherein the predetermined acceptable range is based on an expected relationship between the timing information measured by the mobile station and timing information reported by the base station of the cell having the detected cell identifier.

6. The method of claim 5 , wherein the predetermined acceptable range comprises the user plane timing adjustment that is reported by the radio base station in response to a radio link setup request which included a cell frame number and chip offset measured by the mobile station.

7. The method of claim 6 , wherein determining whether the timing information is within the predetermined acceptable range comprises determining whether the user plane timing adjustment is within the predetermined acceptable range.

8. The method of claim 1 , wherein the predetermined acceptable range is indicative of a distance between base stations.

9. The method of claim 1 , wherein the cell identifiers comprise primary scrambling codes.

10. The method of claim 1 , comprising

removing the detected cell identifier from the provided list for the mobile station for at least a selected time responsive to determining that the determined timing information is outside of the predetermined acceptable range.

11. The method of claim 10 , comprising

establishing a time period during which the detected cell identifier will be prevented from being included in the target active set of the controller; and

preventing the detected cell identifier from being included in the target active set responsive to a subsequent receipt of the detected cell identifier from the mobile station if the time period has not yet expired.

12. The method of claim 1 , comprising

instructing the mobile station to turn off a cell set reporting functionality of the mobile station at least while the provided list is being used by the mobile station.

13. The method of claim 1 , wherein the determined timing information being within the predetermined acceptable range indicates that the cell corresponding to the detected cell identifier is the candidate cell in the target active set having the detected cell identifier.

14. A method of communicating, comprising the steps of:

receiving a list of cell identifiers at a mobile station, the list comprising a target active set of a controller that indicates candidate cells for possible communication with the mobile station;

detecting at least one of the cell identifiers from the list;

providing an indication that the mobile station has detected the at least one cell identifier; and

attempting to establish a communication link with the base station of the cell having the detected cell identifier when the cell is included in an active set for the mobile station responsive to timing information regarding the cell corresponding to the detected cell identifier being within an acceptable range.

15. The method of claim 14 , comprising

attempting a soft handover to the cell corresponding to the detected cell identifier.

16. The method of claim 14 , wherein the timing information comprises a cell frame number (CFN) offset.

17. The method of claim 14 , wherein the timing information comprises a cell chip offset.

18. The method of claim 14 , wherein the timing information comprises user plane timing adjustment information.

19. The method of claim 14 , wherein the predetermined acceptable range is indicative of a distance between base stations.

20. The method of claim 14 , wherein the cell identifiers comprise primary scrambling codes.

21. The method of claim 14 , comprising

removing the detected cell identifier from the received list for at least a selected time responsive to a corresponding indication from the provider of the received list.

22. The method of claim 14 , comprising

turning off a cell set reporting functionality of the mobile station at least while the received list is being used by the mobile station responsive to a corresponding indication from the provider of the received list.

23. The method of claim 14 , wherein the timing information regarding the cell corresponding to the detected cell identifier being within the acceptable range indicates that the cell corresponding to the detected cell identifier is the candidate cell in the target active set having the detected cell identifier.

Assignments (10)