Method of generating a handoff candidate list

• US 7,110,766 B1
• Filed: 05/31/2005
• Issued: 09/19/2006
• Est. Priority Date: 05/31/2005
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Tayloe, Daniel R., Hogberg, Shawn W., Wright, Douglas E.
• Primary Examiner(s): Le, Danh Cong
• Application Number:
  US11/142,058
• Time in Patent Office: 476 Days
• Field of Search: 455/438, 455/439, 455/436, 370/331, 370/332
• US Class Current: 455/438
• CPC Class Codes: H04W 36/0061 of neighbour cell information

Abstract

A method of generating a handoff candidate list (490) to provide to a mobile station (302) may include providing the mobile station in a multi-sector handoff state (360) with a unique combination of a plurality of sectors (362, 363, 364), and recording at least one target sector (371, 372, 373) selected from a plurality of available sectors (366) that is added to the unique combination of the plurality of sectors. The recording step may be iteratively performed whenever the mobile station is in the multi-sector handoff state with the unique combination of the plurality of sectors thereby defining the at least one target sector that has actually been used by the mobile station in the multi-sector handoff state with the unique combination of the plurality of sectors. Upon the mobile station entering the multi-sector handoff state with the unique combination of the plurality of sectors, providing the handoff candidate list to the mobile station, wherein the handoff candidate list comprises the at least one target sector.

Claims

1. A method of providing a handoff candidate list to a mobile station, comprising:

providing the mobile station in a multi-sector handoff state with a unique combination of a plurality of sectors; and

communicating the handoff candidate list to the mobile station, wherein the handoff candidate list comprises at least one target sector selected from a plurality of available sectors, and wherein the at least one target sector has a higher probability of actually being used by the mobile station in the multi-sector handoff state based on the unique combination of the plurality of sectors and at least one of a historical data set and a predictive data set of the unique combination of the plurality of sectors.

2. The method of claim 1, wherein the at least one target sector was actually selected previously.

3. The method of claim 1, wherein selecting comprises selecting the at least one target sector based on a weighted average of a higher probability of actually being selected and a signal quality metric of the at least one target sector.

4. The method of claim 1, further comprising selecting the at least one target sector, wherein the unique combination of the plurality of sectors and the historical data set are used to select the at least one target sector.

5. The method of claim 4, wherein the historical data set comprises the at least one target sector used most frequently when the mobile station is in the multi-sector handoff state with the unique combination of the plurality of sectors.

6. The method of claim 1, further comprising selecting the at least one target sector, wherein the unique combination of the plurality of sectors and the predictive data set are used to select the at least one target sector.

7. The method of claim 6, wherein the predictive data set comprises the at least one target sector used most frequently when the mobile station is in the multi-sector handoff state with the unique combination of the plurality of sectors.

8. A method of generating a handoff candidate list to provide to a mobile station, comprising:

providing the mobile station in a multi-sector handoff state with a unique combination of a plurality of sectors;

recording at least one target sector selected from a plurality of available sectors that is added to the unique combination of the plurality of sectors;

iteratively performing the recording step whenever the mobile station is in the multi-sector handoff state with the unique combination of the plurality of sectors thereby defining the at least one target sector that has actually been used by the mobile station in the multi-sector handoff state with the unique combination of the plurality of sectors; and

upon the mobile station entering the multi-sector handoff state with the unique combination of the plurality of sectors, providing the handoff candidate list to the mobile station, wherein the handoff candidate list comprises the at least one target sector.

9. The method of claim 8, further comprising ranking the at least one target sector based on a probability of actually being used by the mobile station.

10. The method of claim 8, wherein recording comprises recording a signal quality metric of the at least one target sector added to the unique combination of the plurality of sectors.

11. The method of claim 10, further comprising ranking the at least one target sector based on a probability of actually being used by the mobile station and the signal quality metric of the at least one target sector.

12. The method of claim 10, further comprising ranking the at least one target sector based on a weighted average of actually being used and the signal quality metric of the at least one target sector.

13. The method of claim 8, further comprising selecting the at least one target sector for inclusion into the handoff candidate list based on the unique combination of the plurality of sectors and a historical data set of the at least one target sector actually used by the mobile station in the multi-sector handoff state with the unique combination of the plurality of sectors.

14. The method of claim 13, wherein the historical data set comprises the at least one target sector used most frequently when the mobile station is in the multi-sector handoff state with the unique combination of the plurality of sectors.

15. The method of claim 8, further comprising for each unique combination of the plurality of sectors in each of a plurality of multi-sector handoff states in a wireless network, recording the at least one target sector selected from the plurality of available sectors that is added as the mobile station transitions among the unique combinations of the plurality of sectors in each of the plurality of multi-sector handoff states.

16. A base station controller performing a method of generating a handoff candidate list to provide to a mobile station, comprising:

communicatively coupling the base station controller to the mobile station while the mobile station is in a multi-sector handoff state with a unique combination of a plurality of sectors;

recording at least one target sector selected from a plurality of available sectors that is added to the unique combination of the plurality of sectors;

iteratively performing the recording step whenever the mobile station is in the multi-sector handoff state with the unique combination of the plurality of sectors thereby defining the at least one target sector that has actually been used by the mobile station in the multi-sector handoff state with the unique combination of the plurality of sectors; and

upon the mobile station entering the multi-sector handoff state with the unique combination of the plurality of sectors, providing the handoff candidate list to the mobile station, wherein the handoff candidate list comprises the at least one target sector.

17. The base station controller of claim 16, further comprising ranking the at least one target sector based on a probability of actually being used by the mobile station.

18. The base station controller of claim 16, wherein recording comprises recording a signal quality metric of the at least one target sector added to the unique combination of the plurality of sectors.

19. The base station controller of claim 18, further comprising ranking the at least one target sector based on a probability of actually being used by the mobile station and the signal quality metric of the at least one target sector.

20. The base station controller of claim 18, further comprising ranking the at least one target sector based on a weighted average of actually being used and the signal quality metric of the at least one target sector.

21. The base station controller of claim 16, further comprising selecting the at least one target sector for inclusion into the handoff candidate list based on the unique combination of the plurality of sectors and a historical data set of the at least one target sector actually used by the mobile station in the multi-sector handoff state with the unique combination of the plurality of sectors.

22. The base station controller of claim 16, further comprising for each unique combination of the plurality of sectors in each of a plurality of multi-sector handoff states in a wireless network, recording the at least one target sector selected from the plurality of available sectors that is added as the mobile station transitions among the unique combinations of the plurality of sectors in each of the plurality of multi-sector handoff states.