Method and apparatus for permitting direct handoff between base stations in a wireless network

• US 6,628,632 B1
• Filed: 07/19/1999
• Issued: 09/30/2003
• Est. Priority Date: 07/19/1999
• Status: Expired due to Term

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Dolan, Michael F.
• Primary Examiner(s): Trost, William
• Assistant Examiner(s): PEREZ GUTIERREZ, RAFAEL
• Application Number:
  US09/356,510
• Time in Patent Office: 1,534 Days
• Field of Search: 455/438, 455/561, 455/560, 455/439, 455/437, 455/442, 455/436, 370/332, 370/331
• US Class Current: 370/332
• CPC Class Codes: H04W 36/10 Reselecting an access point controller
• CPC Class Codes: H04W 92/20 between access points

Abstract

A handoff method and apparatus are disclosed for use in a wireless communication network in which a primary base station servicing a call directly selects a handoff candidate base station based in part on provided base station identity and address information. The base station is operable to directly establish a connection with a handoff candidate, selected from the one or more neighbor base stations, or neighbors of its neighbors, and handoff the call, based on one or more signal quality measurements and base station identity and address information.

Claims

1. A base station controller, associated with a primary base station, for wireless signal communication directly between base stations, comprising:

a processor, adapted to initiate direct contact with a neighboring base station in preparation of wireless communication signal handoff from the primary base station,

the processor being further adapted to output a signal contacting the neighboring base station and to receive information from the contacted neighboring base station, including address information of second order neighbors; and

a memory, adapted to store received information, including address information of the second order neighbors, the processor thereafter being adapted to initiate a handoff of the wireless communication signal directly from the primary base station to a selected neighboring base station, among the second order neighbors, using the received information.

2. The base station controller of claim 1, wherein the processor is further adapted to receive signal quality measurements for neighboring base stations and second order neighbors and the processor is adapted to selected an acceptable one of the neighboring base stations and second order neighbors and initiate handoff of the wireless communication signal from the primary base station to the selected base station based on the received signal quality measurements.

3. The base station controller of claim 2, wherein the wireless communication signal is a wireless communication call of a wireless unit being handled by the primary base station.

4. The base station controller of claim 3, wherein the received signal quality measurements are measurements of the quality of the wireless communication call at the neighboring base stations and the second order neighbors.

5. The base station controller of claim 1, wherein the processor is further adapted to receive signal quality measurements for neighboring base stations and the processor is adapted to initiate contact with a neighboring base station based on the received signal quality measurements.

6. The base station controller of claim 5, wherein the processor is further adapted to receive signal quality measurements for second order neighbors upon the processor determining that no neighboring base station is acceptable for handoff of the wireless communication signal and wherein the processor is adapted to select an acceptable one of the second order neighbors and initiate handoff of the wireless communication signal from the primary base station to the selected second order neighbor based on the received signal quality measurements.

7. The base station controller of claim 6, wherein the processor is further adapted to receive signal quality measurement for third order neighbors upon the processor determining that no second order neighbor is acceptable for handoff for the wireless communication signal and wherein the processor is adapted to select an acceptable one of the third order neighbors and initiate handoff of the wireless communication signal from the primary base station to the selected third order neighbor based on the received signal quality measurements.

8. The base station controller of claim 7, wherein the wireless communication signal is a wireless communication call of a wireless unit being handled by the primary base station.

9. The base station controller of claim 8, wherein the received signal quality measurements are measurements of the quality of the wireless communication call at the neighboring base stations and the third order neighbors.

10. The base station controller of claim 6, wherein the wireless communication signal is a wireless communication call of a wireless unit being handled by the primary base station.

11. The base station controller of claim 10, wherein the received signal quality measurements are measurements of the quality of the wireless communication call at the neighboring base stations and the second order neighbors.

12. The base station controller of claim 5, wherein the wireless communication signal is a wireless communication call of a wireless unit being handled by the primary base station.

13. The base station controller of claim 12, wherein the received signal quality measurements are measurements of the quality of the wireless communication call at the neighboring base stations.

14. The base station controller of claim 1, wherein the wireless communication signal is a wireless communication call of a wireless unit being handled by the primary base station.

15. The base station controller of claim 1, wherein the processor is further adapted to receive information including address information of third order neighbors.

16. The base station controller of claim 15, wherein the processor is adapted to initiate handoff of the wireless communication signal directly from the primary base station to a selected one of the neighboring base station, the second order neighbors and the third order neighbors, using the received information.

17. The base station controller of claim 15, further comprising:

a memory, adapted to store received information, including address information of the second order neighbors and of the third order neighbors.

18. The base station controller of claim 17, wherein the processor is adapted to initiate handoff of the wireless communication signal directly from the primary base station to a selected one of the neighboring base station, the second order neighbors and the third order neighbors, using the received information.

19. The base station controller of claim 1, wherein the handoff performed is a semi-soft handoff.

20. The base station controller of claim 1, wherein the handoff performed is a soft handoff.

22. The method of claim 1, further comprising the step of:

receiving signal quality measurements for neighboring base stations and second order neighbors at the primary base station, and

selecting an acceptable one of the neighboring base stations and second order neighbors for handing off of the wireless communication signal based on the received signal quality measurements.

23. The method of claim 22, wherein the wireless communication signal is a wireless communication call of a wireless unit being handled by the primary base station.

24. The method of claim 23, wherein the received signal quality measurements are measurements of the quality of the wireless communication call at the neighboring base stations and the second order neighbors.

25. The method of claim 1, further comprising the steps of:

receiving signal quality measurements for neighboring base stations at the primary base station; and

contacting a neighboring base station directly based on the received signal quality measurements.

26. The method of claim 25, further comprising the steps of:

receiving signal quality measurements for second order neighbors at the primary base station, upon determining that no neighboring base station is acceptable for handing off of the wireless communication signal; and

selecting an acceptable one of the second order neighbors for handing off of the wireless communication signal based on the received signal quality measurements.

27. The method of claim 26, further comprising the steps of:

receiving signal quality measurements for third order neighbors at the primary base station, upon determining that no second order neighbor is acceptable for handing off of the wireless communication signal; and

selecting an acceptable one of the third order neighbors for handing off of the wireless communication signal based on the received signal quality measurements.

28. The method of claim 27, wherein the wireless communication signal is a wireless communication call of a wireless unit being handled by the primary base station.

29. The method of claim 28, wherein the received signal quality measurements are measurements of the quality of the wireless communication call at the neighboring base stations and the third order neighbors.

30. The method of claim 26, wherein the wireless communication signal is a wireless communication call of a wireless unit being handled by the primary base station.

31. The method of claim 30, wherein the received signal quality measurements are measurements of the quality of the wireless communication call at the neighboring base stations and the second order neighbors.

32. The method of claim 25, wherein the wireless communication signal is a wireless communication call of a wireless unit being handled by the primary base station.

33. The method of claim 32, wherein the received signal quality measurements are measurements of the quality of the wireless communication call at the neighboring base stations.

34. The method of claim 1, wherein the wireless communication signal is a wireless communication call of a wireless unit being handled by the primary base station.

35. The method of claim 1, wherein the information received includes address information of third order neighbors.

36. The method of claim 35, wherein the wireless communication signal is handed off directly from the primary base station to a selected one of the neighboring base stations, the second order neighbors and the third order neighbors, using the received information.

37. The method of claim 1, wherein the handoff performed is a semi-soft handoff.

38. The method of claim 1, wherein the handoff performed is a soft handoff.

21. A method of wireless signal communication directly between base stations in a wireless network comprising:

contacting a neighboring base station directly in preparation of wireless communication signal handoff from a primary base station;

receiving information at the primary base station from the contacted neighboring base station, including identity and address information of second order neighbors; and

performing a handoff of the wireless communication signal directly from the primary base station to a selected neighboring base station, including the neighboring base station and the second order neighbors, using the received information.