Method and apparatus for enhancement of synchronization for TD-SCDMA baton handover

• US 9,125,149 B2
• Filed: 04/07/2010
• Issued: 09/01/2015
• Est. Priority Date: 09/30/2009
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chin, Tom, Shi, Guangming, Lee, Kuo-Chun
• Primary Examiner(s): AJIBADE AKONAI, OLUMIDE
• Application Number:
  US13/379,598
• Publication Number:
  US 20120184278A1
• Time in Patent Office: 1,973 Days
• Field of Search: 455436-444, 370/332, 370/280, 370/465, 370/329, 370/331, 370/328, 370/330, 370/350, 370/503, 370/504, 370/509, 370/512
• US Class Current: 1/1
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/0072 of resource information of target access point
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/001 Synchronization between nodes

Abstract

A method and apparatus for wireless communication comprising switching an uplink (UL) from a source cell to a target cell; and receiving a Synchronization Shift (SS) command from the source cell, wherein the SS command is generated by the target cell. In one aspect, the method and apparatus further comprise switching a downlink (DL) through the target cell; completing a physical channel reconfiguration; and sending a Physical Channel Reconfiguration Complete message to the Radio Network Controller (RNC) through the target cell.

Claims

1. A method of wireless communication for Time Division Synchronous Code Division Multiple Access (TD-SCDMA) baton handover comprising:

switching an uplink (UL) from a source cell to a target cell at a first time;

receiving a Synchronization Shift (SS) command from the source cell at a second time, wherein the SS command is generated by the target cell; and

switching a downlink (DL) from the source cell to the target cell at a third time,

in which the first time is before the second time and the second time is before the third time.

2. The method of claim 1 further comprising:

completing a physical channel reconfiguration.

3. The method of claim 2 further comprising sending a Physical Channel Reconfiguration Complete message to the Radio Network Controller (RNC) through the target cell.

4. The method of claim 2 wherein the target cell and the source cell are associated with a base station and the Synchronization Shift (SS) command is sent from the target cell to the source cell prior to being received.

5. The method of claim 4 wherein the base station is a Node B, and the source cell and the target cell are part of a UMTS Terrestrial Radio Access Network (UTRAN).

6. The method of claim 2 wherein the target cell is associated with a first base station and the source cell is associated with a second base station, and wherein the first base station is not the same as the second base station.

7. The method of claim 6 wherein the first base station and the second base station are part of a UMTS Terrestrial Radio Access Network (UTRAN).

8. The method of claim 7 wherein the Synchronization Shift (SS) command is forwarded by the target cell to the Radio Network Controller (RNC) and the RNC in turn forwards the Synchronization Shift (SS) command to the source cell prior to being received.

9. The method of claim 1 wherein timing correction of the start of a baton handover is calculated by the target cell and converted into the Synchronization Shift (SS) command.

10. The method of claim 9 wherein the Synchronization Shift (SS) command is based on a Synchronization Shift (SS) indication message originated from the target cell and transmitted over an Iub interface.

11. An apparatus for wireless communication for Time Division Synchronous Code Division Multiple Access (TD-SCDMA) baton handover comprising:

means for switching an uplink (UL) from a source cell to a target cell at a first time;

means for receiving a Synchronization Shift (SS) command from the source cell at a second time, wherein the SS command is generated by the target cell; and

means for switching a downlink (DL) from the source cell to the target cell at a third time,

in which the first time is before the second time and the second time is before the third time.

12. The apparatus of claim 11 further comprising:

means for completing a physical channel reconfiguration.

13. The apparatus of claim 12 further comprising means for sending a Physical Channel Reconfiguration Complete message to the Radio Network Controller (RNC) through the target cell.

14. The apparatus of claim 12 wherein the target cell and the source cell are associated with a base station and the Synchronization Shift (SS) command is sent from the target cell to the source cell prior to being received.

15. The apparatus of claim 14 wherein the base station is a Node B, and the source cell and the target cell are part of a UMTS Terrestrial Radio Access Network (UTRAN).

16. The apparatus of claim 12 wherein the target cell is associated with a first base station and the source cell is associated with a second base station, and wherein the first base station is not the same as the second base station.

17. The apparatus of claim 16 wherein the first base station and the second base station are part of a UMTS Terrestrial Radio Access Network (UTRAN).

18. The apparatus of claim 17 wherein the Synchronization Shift (SS) command is forwarded by the target cell to the Radio Network Controller (RNC) and the RNC in turn forwards the Synchronization Shift (SS) command to the source cell prior to being received.

19. The apparatus of claim 11 wherein timing correction of the start of a baton handover is calculated by the target cell and converted into the Synchronization Shift (SS) command.

20. The apparatus of claim 19 wherein the Synchronization Shift (SS) command is based on a Synchronization Shift (SS) indication message originated from the target cell and transmitted over an Iub interface.

21. A computer program product for Time Division Synchronous Code Division Multiple Access (TD-SCDMA) baton handover, comprising:

a non-transitory computer-readable medium comprising code for;

switching an uplink (UL) from a source cell to a target cell at a first time;

receiving a Synchronization Shift (SS) command from the source cell at a second time, wherein the SS command is generated by the target cell; and

switching a downlink (DL) from the source cell to the target cell at a third time,

in which the first time is before the second time and the second time is before the third time.

22. The computer program product of claim 21 further comprising code for:

completing a physical channel reconfiguration.

23. The computer program product of claim 22 further comprising code for sending a Physical Channel Reconfiguration Complete message to the Radio Network Controller (RNC) through the target cell.

24. The computer program product of claim 22 wherein the target cell and the source cell are associated with a base station and the Synchronization Shift (SS) command is sent from the target cell to the source cell prior to being received.

25. The computer program product of claim 24 wherein the base station is a Node B, and the source cell and the target cell are part of a UMTS Terrestrial Radio Access Network (UTRAN).

26. The computer program product of claim 22 wherein the target cell is associated with a first base station and the source cell is associated with a second base station, and wherein the first base station is not the same as the second base station.

27. The computer program product of claim 26 wherein the first base station and the second base station are part of a UMTS Terrestrial Radio Access Network (UTRAN).

28. The computer program product of claim 27 wherein the Synchronization Shift (SS) command is forwarded by the target cell to the Radio Network Controller (RNC) and the RNC in turn forwards the Synchronization Shift (SS) command to the source cell prior to being received.

29. The computer program product of claim 21 wherein timing correction of the start of a baton handover is calculated by the target cell and converted into the Synchronization Shift (SS) command.

30. The computer program product of claim 29 wherein the Synchronization Shift (SS) command is based on a Synchronization Shift (SS) indication message originated from the target cell and transmitted over an Iub interface.

31. An apparatus for wireless communication for Time Division Synchronous Code Division Multiple Access (TD-SCDMA) baton handover, comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to;

switch an uplink (UL) from a source cell to a target cell at a first time; and

receive a Synchronization Shift (SS) command from the source cell at a second time, wherein the SS command is generated and forwarded to the source cell by the target cell; and

switch a downlink (DL) from the source cell to the target cell at a third time,

in which the first time is before the second time and the second time is before the third time.

32. The apparatus of claim 31 wherein the at least one processor is further configured to:

complete a physical channel reconfiguration.

33. The apparatus of claim 32 wherein the at least one processor is further configured to send a Physical Channel Reconfiguration Complete message to the Radio Network Controller (RNC) through the target cell.

34. The apparatus of claim 32 wherein the target cell and the source cell are associated with a base station and the Synchronization Shift (SS) command is sent from the target cell to the source cell prior to being received.

35. The apparatus of claim 34 wherein the base station is a Node B, and the source cell and the target cell are part of a UMTS Terrestrial Radio Access Network (UTRAN).

36. The apparatus of claim 32 wherein the target cell is associated with a first base station and the source cell is associated with a second base station, and wherein the first base station is not the same as the second base station.

37. The apparatus of claim 36 wherein the first base station and the second base station are part of a UMTS Terrestrial Radio Access Network (UTRAN).

38. The apparatus of claim 37 wherein the Synchronization Shift (SS) command is forwarded by the target cell to the Radio Network Controller (RNC) and the RNC in turn forwards the Synchronization Shift (SS) command to the source cell prior to being received.

39. The apparatus of claim 31 wherein timing correction of the start of a baton handover is calculated by the target cell and converted into the Synchronization Shift (SS) command.

40. The apparatus of claim 39 wherein the Synchronization Shift (SS) command is based on a Synchronization Shift (SS) indication message originated from the target cell and transmitted over an Iub interface.