System and method for supporting soft handover in broadband wireless access communication system

• US 20050288026A1
• Filed: 06/10/2005
• Published: 12/29/2005
• Est. Priority Date: 06/10/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Jeong-Heon, Cho, Jae-Weon, Maeng, Seung-Joo, Jang, Ji-Ho, Jeon, Jae-Ho, Joo, Pan-Yuh, Byun, Myung-Kwang
• Application Number:
  US11/149,696
• Publication Number:
  US 20050288026A1
• Time in Patent Office: Days
• US Class Current: 455/442
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04W 36/00692 using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] allocation of physical resources in CoMP or in CA H04L5/0035
• CPC Class Codes: H04W 36/185 using make before break

Abstract

Disclosed is a method for supporting a serving BS currently providing an MS with a communication service to perform handover in a broadband wireless access communication system which includes the MS, the serving BS and a target BS to which handover of the MS is directed. In such a method, the serving BS allocates the same sub-channel as that allocated to the MS in a specific time period by the target BS in the same time period, and information about the allocated sub-channel is transmitted to the MS.

Claims

1. A method for supporting a serving base station (BS) currently providing a mobile station (MS) with a communication service to perform a handover in a broadband wireless access communication system which includes the MS, the serving BS and a target BS to which handover of the MS is directed, the method comprising the steps of:

allowing one of the serving BS and the target BS to allocate the same sub-channel as that which is allocated by the other BS to the MS in a specific time period in the same time period; and

transmitting information about the allocated sub-channel to the MS.

2. The method as claimed in claim 1, wherein at least one of the serving BS and the target BS transmits sub-channel allocation information of at least one of the serving BS and the target BS to the MS.

3. The method as claimed in claim 2, wherein the sub-channel allocation information of the respective BSs is included in at least one of a UL-MAP and a DL-MAP of the respective BSs.

4. A method for supporting a serving base station (BS) currently providing a mobile station (MS) with a communication service to perform a handover in a broadband wireless access communication system which includes the MS, the serving BS and a target BS to which handover of the MS is directed, the method comprising the steps of:

allowing one of the serving BS and the target BS to allocate a different sub-channel from that which is allocated by the other BS to the MS in a specific time period in the same specific time period; and

transmitting information about the allocated sub-channel to the MS.

5. The method as claimed in claim 5, wherein at least one of the serving BS and the target BS transmits sub-channel allocation information of the serving BS and the target BS to the MS.

6. The method as claimed in claim 5, wherein the serving BS and the target BS transmit their own sub-channel allocation information to the MS.

7. The method as claimed in claim 5, wherein the sub-channel allocation information of the respective BSs is included in at least one of a UL-MAP and a DL-MAP of the respective BSs.

8. The method as claimed in claim 6, wherein the sub-channel allocation information of the respective BSs is included in at least one of a UL-MAP and a DL-MAP of the respective BSs.

9. A method for supporting a serving base station (BS) currently providing a mobile station (MS) with a communication service to perform a handover in a broadband wireless access communication system which includes the MS, the serving BS and a target BS to which handover of the MS is directed, the method comprising the steps of:

allowing one of the serving BS and the target BS to allocate a different sub-channel from that which is allocated by the other BS to the MS in a specific time period in a different time period; and

transmitting information about the allocated sub-channel to the MS.

10. The method as claimed in claim 9, wherein at least one of the serving BS and the target BS transmits sub-channel allocation information of the serving BS and the target BS to the MS.

11. The method as claimed in claim 9, wherein the serving BS and the target BS transmit their own sub-channel allocation information to the MS.

12. The method as claimed in claim 10, wherein the sub-channel allocation information of the respective BSs is included in at least one of a UL-MAP and a DL-MAP of the respective BSs.

13. The method as claimed in claim 11, wherein the sub-channel allocation information of the respective BSs is included in at least one of a UL-MAP and a DL-MAP of the respective BSs.

14. A method for transmitting a signal by an MS in order to perform a handover in a broadband wireless access communication system which includes the MS, a serving BS currently providing the MS with a communication service and a target BS to which handover of the MS is directed, the method comprising the steps of:

receiving information about sub-channel allocation of the serving BS and information about sub-channel allocation of the target BS from at least one of the serving BS and the target BS; and

transmitting the signal to the serving BS and the target BS using the allocated sub-channel corresponding to the information about sub-channel allocation.

15. The method as claimed in claim 14, wherein the sub-channel allocation information of the respective BSs is included in at least one of UL-MAPs and DL-MAPs of the respective BSs.

16. The method as claimed in claim 14, wherein, when the same sub-channels are allocated in the same time slots, the MS receives the sub-channel allocation information of the serving BS and the sub-channel allocation information of the target BS from at least one of the serving BS and the target BS.

17. The method as claimed in claim 14, wherein, when the same sub-channels are allocated in the same time slots, the MS receives the sub-channel allocation information of the serving BS and the sub-channel allocation information of the target BS from one BS, a channel condition of which is better than the other, of the serving BS and the target BS.

18. The method as claimed in claim 14, wherein when the sub-channel allocated by the serving BS and the sub-channel allocated by the target BS are different from each other, the MS receives the sub-channel information of the serving BS and the sub-channel information of the target BS from the respective BSs.

19. The method as claimed in claim 14, wherein, when the sub-channel allocated by the serving BS and the sub-channel allocated by the target BS are different from each other, the MS receives the sub-channel information of the BSs from at least one of the serving BS and the target BS.

20. A system for supporting handover in a broadband wireless access communication system, the system comprising:

a mobile station (MS);

a serving base station (BS) which currently provides a communication service to the MS; and

a target BS to which handover of the MS is directed, wherein one of the serving BS and the target BS allocates the same sub-channel as that which is allocated by the other BS to the MS in a specific time period in the same time period and at least one of the serving BS and the target BS transmits information about the allocated sub-channel to the MS, and wherein the MS receives the information about the allocated sub-channel and transmits a signal to the serving BS and the target BS using the allocated sub-channel corresponding to the information about the allocated sub-channel.

21. The system as claimed in claim 20, wherein the serving BS transmits sub-channel allocation information of the target BS together with its own sub-channel allocation information.

22. The system as claimed in claim 20, wherein the target BS transmits sub-channel allocation information of the serving BS together with its own sub-channel allocation information.

23. The system as claimed in claim 20, wherein, when the same sub-channels are allocated in the same time slots, the MS receives the sub-channel allocation information of the serving BS and the sub-channel allocation information of the target BS from at least one of the serving BS and the target BS.

24. The system as claimed in claim 20, wherein, when the same sub-channels are allocated in the same time slots, the MS receives the sub-channel allocation information of the serving BS and the sub-channel allocation information of the target BS from one BS, a channel condition of which is better than the other, of the serving BS and the target BS.

25. A system for supporting handover in a broadband wireless access communication system, the system comprising:

a mobile station (MS);

a serving base station (BS) which currently provides a communication service to the MS; and

a target BS to which handover of the MS is directed,

wherein one of the serving BS and the target BS allocates the different sub-channel as that which is allocated by the other BS to the MS in a specific time period in the same time period and at least one of the serving BS and the target_BS transmits information about the allocated sub-channel to the MS, and wherein the MS receives the information about the allocated sub-channel and transmits a signal to the serving BS and the target BS using the allocated sub-channel corresponding to the information about the allocated sub-channel.

26. The system as claimed in claim 25, wherein the MS receives the sub-channel information of the serving BS and the sub-channel information of the target BS from the respective BSs.

27. The system as claimed in claim 25, wherein the MS receives the sub-channel information of the BSs from at least one of the serving BS and the target BS.

28. A system for supporting handover in a broadband wireless access communication system, the system comprising:

a mobile station (MS);

a serving base station (BS) which currently provides a communication service to the MS; and

a target BS to which handover of the MS is directed,

wherein one of the serving BS and the target BS allocates the different sub-channel as that which is allocated by the other BS to the MS in a specific time period in the different time period and at least one of the serving BS and the target BS transmits information about the allocated sub-channel to the MS, and wherein the MS receives the information about the allocated sub-channel and transmits a signal to the serving BS and the target BS using the allocated sub-channel corresponding to the information about the allocated sub-channel.

29. The system as claimed in claim 28, wherein the MS receives the sub-channel information of the serving BS and the sub-channel information of the target BS from the respective BSs.

30. The system as claimed in claim 28, wherein the MS receives the sub-channel information of the BSs from at least one of the serving BS and the target BS.

31. A method for transmitting a signal by an BS in order to perform a handover in a broadband wireless access communication system which includes the MS, a serving BS currently providing the MS with a communication service and a target BS to which handover of the MS is directed, the method comprising the steps of:

receiving information about sub-channel allocation of the serving BS and information about sub-channel allocation of the target BS from at least one of the serving BS and the target BS; and

transmitting the signal to the MS using the allocated sub-channel corresponding to the information about sub-channel allocation.

32. The method as claimed in claim 31, wherein the sub-channel allocation information of the respective BSs is included in at least one of UL-MAPs and DL-MAPs of the respective BSs.

33. The method as claimed in claim 31, wherein, when the same sub-channels are allocated in the same time slots, the MS receives the sub-channel allocation information of the serving BS and the sub-channel allocation information of the target BS from at least one of the serving BS and the target BS.

34. The method as claimed in claim 31, wherein, when the same sub-channels are allocated in the same time slots, the MS receives the sub-channel allocation information of the serving BS and the sub-channel allocation information of the target BS from one BS, a channel condition of which is better than the other, of the serving BS and the target BS.

35. The method as claimed in claim 31, wherein when the sub-channel allocated by the serving BS and the sub-channel allocated by the target BS are different from each other, the MS receives the sub-channel information of the serving BS and the sub-channel information of the target BS from the respective BSs.

36. The method as claimed in claim 31, wherein, when the sub-channel allocated by the serving BS and the sub-channel allocated by the target BS are different from each other, the MS receives the sub-channel information of the BSs from at least one of the serving BS and the target BS.

37. A system for supporting handover in a broadband wireless access communication system, the system comprising:

a mobile station (MS);

a serving base station (BS) which currently provides a communication service to the MS; and

a target BS to which handover of the MS is directed,

wherein one of the serving BS and the target BS allocates the same sub-channel as that which is allocated by the other BS to the MS in a specific time period in the same time period and at least one of the serving BS and the target BS transmits information about the allocated sub-channel to the MS, and wherein the MS receives the information about the allocated sub-channel and the serving BS and the target BS transmit a signal to the MS using the allocated sub-channel corresponding to the information about the allocated sub-channel.

38. The system as claimed in claim 37, wherein the serving BS transmits sub-channel allocation information of the target BS together with its own sub-channel allocation information.

39. The system as claimed in claim 37, wherein the target BS transmits sub-channel allocation information of the serving BS together with its own sub-channel allocation information.

40. The system as claimed in claim 37, wherein, when the same sub-channels are allocated in the same time slots, the MS receives the sub-channel allocation information of the serving BS and the sub-channel allocation information of the target BS from at least one of the serving BS and the target BS.

41. The system as claimed in claim 37, wherein, when the same sub-channels are allocated in the same time slots, the MS receives the sub-channel allocation information of the serving BS and the sub-channel allocation information of the target BS from one BS, a channel condition of which is better than the other, of the serving BS and the target BS.

42. A system for supporting handover in a broadband wireless access communication system, the system comprising:

a mobile station (MS);

a serving base station (BS) which currently provides a communication service to the MS; and

a target BS to which handover of the MS is directed,

wherein one of the serving BS and the target BS allocates the different sub-channel as that which is allocated by the other BS to the MS in a specific time period in the same time period and at least one of the serving BS and the target BS transmits information about the allocated sub-channel to the MS, and wherein the MS receives the information about the allocated sub-channel and the serving BS and the target BS transmit a signal to the MS using the allocated sub-channel corresponding to the information about the allocated sub-channel.

43. The system as claimed in claim 42, wherein the MS receives the sub-channel information of the serving BS and the sub-channel information of the target BS from the respective BSs.

44. The system as claimed in claim 42, wherein the MS receives the sub-channel information of the BSs from at least one of the serving BS and the target BS.

45. A system for supporting handover in a broadband wireless access communication system, the system comprising:

a mobile station (MS);

a serving base station (BS) which currently provides a communication service to the MS; and

a target BS to which handover of the MS is directed,

wherein one of the serving BS and the target BS allocates the different sub-channel as that which is allocated by the other BS to the MS in a specific time period in the different time period and at least one of the serving BS and the target BS transmits information about the allocated sub-channel to the MS, and wherein the MS receives the information about the allocated sub-channel and the serving BS and the target BS transmit a signal to the MS using the allocated sub-channel corresponding to the information about the allocated sub-channel.

46. The system as claimed in claim 45, wherein the MS receives the sub-channel information of the serving BS and the sub-channel information of the target BS from the respective BSs.

47. The system as claimed in claim 45, wherein the MS receives the sub-channel information of the BSs from at least one of the serving BS and the target BS.