Method for handoff during connected mode of a multimode mobile station in mixed deployment

• US 9,173,138 B2
• Filed: 07/07/2009
• Issued: 10/27/2015
• Est. Priority Date: 07/07/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Agiwal, Anil, Nigam, Arishuman, Vadlapudi, Tirumala Sree Hari Vara Prasad
• Primary Examiner(s): Chang, Kent
• Assistant Examiner(s): Lu, William
• Application Number:
  US12/459,723
• Publication Number:
  US 20100002653A1
• Time in Patent Office: 2,303 Days
• Field of Search: 370330-342, 370/328, 370/352, 370/267, 370/503, 370/318, 455/41.2, 455/63.1, 455/434, 455/450, 455/509, 455/501, 455/422.1, 455/432.1, 4554611-4615, 455/436, 455/418, 455/458, 455/437, 455/343.2, 455/438
• US Class Current: 1/1
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface

Abstract

Methods for handoff of a multimode mobile station (MS). The MS, in connected mode, moves from a cell of a legacy base station to a cell of an ABS and scans base stations from a list of neighboring base stations, wherein at least the ABS is listed as another legacy base station in the list of neighboring base stations. The MS performs the handoff to connect to a legacy zone of the ABS. Further, the multimode MS switching from the legacy zone of the ABS to a advanced zone of the ABS based on a Zone Switch request or command is triggered by either the multimode MS or the ABS. The Zone Switch request is triggered after detecting capabilities of either the multimode MS or the ABS that they support advanced zone. The capabilities are detected by using MAC versions of the multimode MS and the ABS or an indicator for the advanced zone. The multimode MS can also performs handoff to the advanced zone from the cell of the legacy base station by receiving one or more information for ranging in the advanced zone from the ABS during the handoff.

Claims

1. A method for handover of a multimode mobile station, the method comprising:

performing, by the multimode mobile station, a handover from a legacy base station to a legacy zone of an advanced base station (ABS); and

performing, by the multimode mobile station, a zone switch for switching from the legacy zone of the ABS to an advanced zone of the ABS,

wherein performing the zone switch comprises;

transmitting, by the multimode mobile station, a ranging request message including MAC version information indicating a capability of the multimode mobile station, to the ABS; and

receiving, by the multimode mobile station, a ranging response message including zone switch information indicating the zone switch to the advanced zone of the ABS from the legacy zone of the ABS, from the ABS.

2. The method of claim 1, wherein transmitting, by the multimode mobile station, the ranging request message to the ABS comprises transmitting the ranging request message by setting a ranging purpose indicator in the ranging request message to a zone switch request.

3. The method of claim 1, wherein the ABS is configured to detect the capability of the multimode mobile station based on the MAC version information of the multimode mobile station, wherein the capability of the multimode mobile station is to support the advanced zone.

4. The method of claim 3, wherein the ABS is configured to detect the capability of the multimode mobile station by using the MAC version information of the multimode mobile station received from one of:

the legacy base station, wherein the MAC version information of the multimode mobile station is received over a backhaul network, and

the multimode mobile station, wherein the MAC version information of the multimode mobile station is received through a signaling message from the multimode mobile station.

5. The method of claim 3, wherein performing the zone switch further comprises switching, by the multimode mobile station, to the advanced zone of the ABS from the legacy zone of the ABS using at least one parameter for switching in zone switch information, wherein the at least one parameter comprises at least one of a frame offset and a preamble information.

6. The method of claim 1, further comprising:

scanning, by the multimode mobile station, a plurality of base stations from a list of neighbouring base stations, wherein the plurality of base stations includes the ABS.

7. The method of claim 6, wherein scanning, by the multimode mobile station, the plurality of base stations from the list of neighbouring base stations comprises:

receiving, by the multimode mobile station, the list of neighbouring base stations from the legacy base station through a neighbour advertisement message.

8. The method of claim 6, wherein performing, by the multimode mobile station, the handover into the legacy zone of the ABS comprises:

transmitting, by the multimode mobile station, a handover request message to the legacy base station;

receiving a handover response message to the handover request message from the legacy base station, wherein the handover response message includes at least one parameter for ranging in the advanced zone of the ABS based on the capability of the multimode mobile station; and

synchronizing, by the multimode mobile station, to the legacy zone of the ABS.

9. The method of claim 8, wherein synchronizing, by the multimode mobile station, to the legacy zone of the ABS comprises:

obtaining, by the multimode mobile station, one or more downlink and uplink parameters of the legacy zone through a broadcast message from the legacy zone of the ABS.

10. The method of claim 6, further comprising detecting, by the multimode mobile station, a capability of the ABS by using MAC version information of the ABS, which comprises:

receiving, by the multimode mobile station, the MAC version information of the ABS through a broadcast message from one of the legacy zone of the ABS and the legacy base station, wherein the MAC version information of the ABS indicates the capability of the ABS.

11. The method of claim 6, further comprising detecting, by the multimode mobile station, a capability of the ABS by using an indicator for indicating the presence of the advanced zone, which comprises:

receiving, by the multimode mobile station, the indicator from the legacy zone of the ABS through a downlink parameter broadcast in Frame Control Header (FCH).

12. The method of claim 1, wherein the zone switch information includes at least one preamble information of the advanced zone and a frame offset between the legacy zone and the advanced zone.

13. The method of claim 1, further comprising:

performing network entry in the advanced zone of the ABS by performing a synchronization with the advanced zone of the ABS, using the zone switch information.

14. The method of claim 1, further comprising:

receiving a neighbour advertisement message from the legacy base station; and

scanning, by the multimode mobile station, a plurality of neighbor base stations including the ABS based on the neighbour advertisement message.

15. The method of claim 1, further comprising:

detecting, by the multimode mobile station, a capability of the ABS indicating that the ABS supports the advanced zone,

wherein detecting the capability of the ABS indicating that the ABS supports the advanced zone comprises detecting the capability of the ABS indicating that the ABS supports the advanced zone by using one of MAC version information of the ABS and indication information for indicating a presence of the advanced zone.

16. The method of claim 15, wherein detecting, by the multimode mobile station, the capability of the ABS by using the MAC version information of the ABS comprises receiving, by the multimode mobile station, the MAC version information of the ABS through a broadcast message from one of the legacy zone of the ABS and the legacy base station.

17. The method of claim 15, wherein detecting, by the multimode mobile station, the capability of the ABS by using the MAC version information of the ABS further comprises receiving, by the multimode mobile station, the MAC version information of the ABS through an overhead message from the legacy zone of the ABS.

18. The method of claim 15, wherein detecting, by the multimode mobile station, the capability of the ABS by using the MAC version information of the ABS further comprises receiving, by the multimode mobile station, the MAC version information of the ABS through a neighbour advertisement message from one of the legacy zone of the ABS and the legacy base station.

19. The method of claim 15, wherein detecting, by the multimode mobile station, the capability of the ABS by using the indication information for indicating the presence of the advanced zone further comprises receiving, by the multimode mobile station, the indication information from the legacy zone of the ABS through a downlink parameter broadcast in Frame Control Header (FCH).

20. The method of claim 15, further comprising:

switching, by the multimode mobile station, to the advanced zone of the ABS from the legacy zone of the ABS based on the ranging response message received from the ABS.

21. The method of claim 15, wherein the ranging response message comprises at least one parameter for switching, wherein the at least one parameter for switching comprises at least one of a frame offset and a preamble information, and wherein switching, by the multimode mobile station, to the advanced zone of the ABS from the legacy zone of the ABS comprises switching to the advanced zone of the ABS by using the at least one parameter.

22. A method for handover of a multimode mobile station, comprising:

receiving, by an advanced base station (ABS) comprising a legacy zone and an advanced zone, a ranging request message including MAC version information indicating a capability of the multimode mobile station, from the multimode mobile station; and

transmitting, by the ABS, a ranging response message including zone switch information indicating a zone switch to the advanced zone of the ABS from the legacy zone of the ABS, to the multimode mobile station.

23. The method of claim 22, wherein the zone switch information includes at least one preamble information of the advanced zone and a frame offset between the legacy zone and the advanced zone.

24. The method of claim 22, further comprising:

performing network entry in the advanced zone of the ABS by performing a synchronization with the advanced zone of the ABS, using the zone switch information.

25. The method of claim 22, further comprising:

determining whether the capability of the multimode mobile station is to support the advanced zone; and

if the multimode mobile station supports the advanced zone, generating the ranging response message including the zone switch information.

26. The method of claim 22, further comprising:

transmitting MAC version information of the ABS indicating a capability of the ABS to the multimode mobile station,

wherein the capability of the ABS indicates that the ABS supports the advanced zone.

27. The method of claim 22, wherein the ranging request message includes a ranging purpose indicator set to a zone switch request.

28. The method of claim 22, wherein the ranging response message comprises at least one parameter for switching, and

wherein the at least one parameter for switching comprises at least one of a frame offset and a preamble information.

29. An apparatus of a multimode mobile station, comprising:

one or more processors configured to perform a handover from a legacy base station to a legacy zone of an advanced base station (ABS), and perform a zone switch for switching from the legacy zone of the ABS to an advanced zone of the ABS; and

a transceiver,

wherein the one or more processors are configured to transmit a ranging request message including MAC version information indicating a capability of the multimode mobile station, to the ABS, and

wherein the transceiver is configured to receive a ranging response message including zone switch information indicating the zone switch to the advanced zone of the ABS from the legacy zone of the ABS, from the ABS.

30. The apparatus of claim 29, wherein the one or more processors are further configured to detect a capability of the ABS indicating that the ABS supports the advanced zone by detecting the capability of the ABS indicating that the ABS supports the advanced zone by using one of MAC version information of the ABS or indication information for indicating a presence of the advanced zone.

31. The apparatus of claim 30, wherein the transceiver is configured to receive the MAC version information of the ABS through a broadcast message from one of the legacy zone of the ABS and the legacy base station.

32. The apparatus of claim 30, wherein the transceiver is configured to receive the MAC version information of the ABS through an overhead message from the legacy zone of the ABS.

33. The apparatus of claim 30, wherein the transceiver is configured to receive the MAC version information of the ABS through a neighbour advertisement message from one of the legacy zone of the ABS and the legacy base station.

34. The apparatus of claim 30, wherein the transceiver is configured to receive the indication information from the legacy zone of the ABS through a downlink parameter broadcast in Frame Control Header (FCH).

35. The apparatus of claim 29, wherein the transceiver is configured to transmit the ranging request message by setting a ranging purpose indicator in the ranging request message to a zone switch request.

36. The apparatus of claim 30, wherein the one or more processors are configured to switch to the advanced zone of the ABS from the legacy zone of the ABS based on the ranging response message received from the ABS.

37. The apparatus of claim 36, wherein the ranging response message comprises at least one parameter for switching, wherein the at least one parameter for switching comprises at least one of a frame offset and a preamble information, and wherein the one or more processors are configured to perform the zone switch for switching, by the multimode mobile station, to the advanced zone of the ABS from the legacy zone of the ABS using the at least one parameter.

38. The apparatus of claim 29, wherein the ABS is configured to detect the capability of the multimode mobile station based on the MAC version information of the multimode mobile station, wherein the capability of the multimode mobile station is to support the advanced zone.

39. The apparatus of claim 38, wherein the ABS is configured to detect the capability of the multimode mobile station by using the MAC version information of the multimode mobile station received from one of:

the legacy base station, wherein the MAC version information of the multimode mobile station is received over a backhaul network, and

the multimode mobile station, wherein the MAC version information of the multimode mobile station is received through a signaling message from the multimode mobile station.

40. The apparatus of claim 38, wherein the one or more processors are configured to switch to the advanced zone of the ABS from the legacy zone of the ABS using at least one parameter for switching in the zone switch information, wherein the at least one parameter comprises at least one of a frame offset and a preamble information.

41. The apparatus of claim 29, wherein the one or more processors are further configured to scan a plurality of base stations from a list of neighbouring base stations, wherein the plurality of base stations includes the ABS.

42. The apparatus of claim 41, wherein the transceiver is configured to receive the list of neighbouring base stations from the legacy base station through a neighbour advertisement message.

43. The apparatus of claim 41, wherein the one or more processors are configured to perform the handover into the legacy zone of the ABS by:

transmitting a handover request message to the legacy base station;

receiving a handover response message to the handover request message from the legacy base station, wherein the handover response message includes at least one parameter for ranging in the advanced zone of the ABS based on the capability of the multimode mobile station; and

synchronizing to the legacy zone of the ABS.

44. The apparatus of claim 43, wherein the one or more processors are configured to synchronize to the legacy zone of the ABS by obtaining, by the multimode mobile station, one or more downlink and uplink parameters of the legacy zone through a broadcast message from the legacy zone of the ABS.

45. The apparatus of claim 41, wherein the transceiver is configured to receive a MAC version of the ABS through a broadcast message from one of the legacy zone of the ABS and the legacy base station, wherein the MAC version of the ABS indicates a capability of the ABS.

46. The apparatus of claim 29, wherein the zone switch information includes at least one preamble information of the advanced zone and a frame offset between the legacy zone and the advanced zone.

47. The apparatus of claim 29, wherein the one or more processors are further configured to perform network entry in the advanced zone of the ABS by performing a synchronization with the advanced zone of the ABS, using the zone switch information.

48. The apparatus of claim 29, wherein the one or more processors are further configured to control the transceiver to receive a neighbour advertisement message from the legacy base station;

and scan a plurality of neighbour base stations including the ABS based on the neighbour advertisement message.

49. An apparatus for handover of a multimode mobile station in an advanced base station (ABS) comprising a legacy zone and an advanced zone, comprising:

a transceiver configured to;

receive a ranging request message including MAC version information indicating a capability of the multimode mobile station, from the multimode mobile station; and

transmit a ranging response message including zone switch information indicating a zone switch to the advanced zone of the ABS from the legacy zone of the ABS, to the multimode mobile station.

50. The apparatus of claim 49, wherein the zone switch information includes at least one preamble information of the advanced zone and a frame offset between the legacy zone and the advanced zone.

51. The apparatus of claim 49, further comprising:

one or more processors configured to perform network entry in the advanced zone of the ABS by performing a synchronization with the advanced zone of the ABS, using the zone switch information.

52. The apparatus of claim 49, further comprising:

one or more processors configured to determine whether the capability of the multimode mobile station is to support the advanced zone; and

if the multimode mobile station supports the advanced zone, generate the ranging response message including the zone switch information.

53. The apparatus of claim 49, wherein:

the transceiver is further configured to transmit MAC version information of the ABS indicating a capability of the ABS to the multimode mobile station, and

the capability of the ABS indicates that the ABS supports the advanced zone.

54. The apparatus of claim 49, wherein the ranging request message includes a ranging purpose indicator set to a zone switch request.

55. The apparatus of claim 49, wherein:

the ranging response message comprises at least one parameter for switching; and

the at least one parameter for switching comprises at least one of a frame offset and preamble information.