System and method for fast network re-entry in a broadband wireless access communication system

• US 7,302,264 B2
• Filed: 06/10/2005
• Issued: 11/27/2007
• Est. Priority Date: 06/11/2004
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Song, Jun-Hyuk, Chang, Yong, Kim, Tae-Ho, Kim, Tae-Won, Chang, Hong-Sung, Yoon, Seung-Il
• Primary Examiner(s): Mehrpour; Naghmeh
• Application Number:
  US11/149,697
• Publication Number:
  US 20050277417A1
• Time in Patent Office: 900 Days
• Field of Search: 455/436, 455/439, 455/445, 455/517, 455/432, 455/524
• US Class Current: 455/436
• CPC Class Codes: H04W 12/041 Key generation or derivation
• CPC Class Codes: H04W 36/0033 with transfer of context information
• CPC Class Codes: H04W 60/04 using triggered events

Abstract

A system and method for fast network re-entry in a broadband wireless access communication system. A mobile station transmits a first message requiring fast network re-entry to a base station and performs the fast network re-entry together with the base station when receiving a second message approving the fast network re-entry from the base station. The base station receives the first message, authenticates the first message using final session information of the mobile station that is previously stored in the base station, transmits the second message to the mobile station when succeeding in authentication of the first message, and performs the fast network re-entry together with the mobile station.

Claims

1. A method for fast network re-entry of a mobile station in a broadband wireless access communication system, the method comprising the steps of:

transmitting a first message requesting fast network re-entry to a base station when the mobile station detects that it is necessary to perform network re-entry to the base station in an idle state in which the mobile station stores final session information of a previous active state;

receiving a second message approving the fast network re-entry from the base station; and

performing the fast network re-entry with the base station.

2. The method as claimed in claim 1, wherein the first message includes first information indicating that the network re-entry to be performed is the fast network re-entry, and second information indicating processes that must be omitted during the fast network re-entry from among a plurality of processes performed in a conventional network re-entry.

3. The method as claimed in claim 2, wherein the second message includes third information indicating approval of the fast network re-entry, and fourth information indicating processes that must be omitted during the fast network re-entry from among a plurality of processes performed in a conventional network re-entry.

4. The method as claimed in claim 3, wherein the step of performing the fast network re-entry with the base station comprises omitting the processes from among the plurality of processes performed in the conventional network re-entry based on the fourth information;

and

performing only remaining processes.

5. The method as claimed in claim 1, wherein the first message is a ranging request message including first information and second information, the first information indicating that the network re-entry is the fast network re-entry, the second information indicating processes that must be omitted during the fast network re-entry from among a subscriber station basic capability negotiation process, a privacy key management process, a network address acquisition process, a time information acquisition process, and a TFTP (Trivial File Transfer Protocol) process, which are performed in a conventional network re-entry.

6. The method as claimed in claim 5, wherein the second message is a ranging response message including third information and fourth information, the third information indicating approval of the fast network re-entry, the fourth information indicating processes which must be omitted during the fast network re-entry from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, which are performed in the conventional network re-entry.

7. The method as claimed in claim 6, wherein the step of performing the fast network re-entry with the base station, comprises:

omitting processes from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, based on the fourth information; and

performing only remaining processes.

8. A method for fast network re-entry of a mobile station in a broadband wireless access communication system including the mobile station, a serving base station that provides service to the mobile station, a target base station, which is different from the serving base station, and an ASA (Authentication and Service Authorization) server connected to the target base station, the method comprising the steps of:

storing final session information by the mobile station when transitioning into an idle state;

transmitting the final session information to the target base station so that the target base station and the ASA server store the final session information, when the mobile station detects that handover from the serving base station to the target base station is necessary, after the mobile station stores the final session information;

transmitting a first message requiring fast network re-entry to the target base station;

receiving a second message approving the fast network re-entry from the target base station; and

performing the fast network re-entry with the target base station.

9. The method as claimed in claim 8, wherein the first message includes first information indicating that the network re-entry is the fast network re-entry, and second information indicating processes that must be omitted during the fast network re-entry from among a plurality of processes performed in a conventional network re-entry.

10. The method as claimed in claim 9, wherein the second message includes third information indicating approval of the fast network re-entry, and fourth information indicating the processes that must be omitted during the fast network re-entry from among the plurality of processes performed in the conventional network re-entry.

11. The method as claimed in claim 10, wherein the step of performing the fast network re-entry with the target base station, comprises:

omitting processes from among the plurality of processes performed in the conventional network re-entry based on the fourth information; and

performing only remaining processes.

12. The method as claimed in claim 8, wherein the first message is a ranging request message including first information and second information, the first information indicating that the network re-entry is the fast network re-entry, the second information indicating processes which must be omitted during the fast network re-entry from among a subscriber station basic capability negotiation process, a privacy key management process, a network address acquisition process, a time information acquisition process and a TFTP (Trivial File Transfer Protocol) process, which are performed in a conventional network re-entry.

13. The method as claimed in claim 12, wherein the second message is a ranging response message including third information and fourth information, the third information indicating approval of the fast network re-entry, the fourth information indicating the processes that must be omitted during the fast network re-entry from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process and the TFTP process, which are performed in the conventional network re-entry.

14. The method as claimed in claim 13, wherein the step of performing the fast network re-entry with the target base station, comprises:

omitting processes from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process and the TFTP process, which are performed in the conventional network re-entry, based on the fourth information; and

performing only remaining processes.

15. A method for fast network re-entry of a base station in a broadband wireless access communication system, the method comprising the steps of:

receiving a first message requiring fast network re-entry from a mobile station that is in an idle state during which the mobile station stores final session information of a previous active state;

authenticating the first message using final session information of the mobile station that is previously stored in the base station;

transmitting a second message approving the fast network re-entry to the mobile station, after the first message is authenticated; and

performing the fast network re-entry with the mobile station.

16. The method as claimed in claim 15, wherein the first message includes first information indicating that the network re-entry is the fast network re-entry, and second information indicating processes that must be omitted during the fast network re-entry from among a plurality of processes performed in a conventional network re-entry.

17. The method as claimed in claim 16, wherein the second message includes third information indicating approval of the fast network re-entry, and fourth information indicating the processes that must be omitted during the fast network re-entry from among the plurality of processes performed in the conventional network re-entry.

18. The method as claimed in claim 17, wherein the step of performing the fast network re-entry with the mobile station, comprises:

omitting processes from among the plurality of processes performed in the conventional network re-entry, based on the fourth information; and

performing only remaining processes.

19. The method as claimed in claim 15, wherein the first message is a ranging request message including first information and second information, the first information indicating that the network re-entry is the fast network re-entry, the second information indicating processes which must be omitted during the fast network re-entry from among a subscriber station basic capability negotiation process, a privacy key management process, a network address acquisition process, a time information acquisition process, and a TFTP (Trivial File Transfer Protocol) process, which are performed in a conventional network re-entry.

20. The method as claimed in claim 19, wherein the second message is a ranging response message including third information and fourth information, the third information indicating approval of the fast network re-entry, the fourth information indicating the processes that must be omitted during the fast network re-entry from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, which are performed in the conventional network re-entry.

21. The method as claimed in claim 20, wherein the step of performing the fast network re-entry together with the mobile station, comprises:

omitting processes from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process and the TFTP process, which are performed in the conventional network re-entry, based on the fourth information; and

performing only remaining processes.

22. A method for fast network re-entry in a broadband wireless access communication system, the method comprising the steps of:

transmitting a first message requiring fast network re-entry from a mobile station to a base station, when the mobile station detects that it is necessary to perform network re-entry to the base station in an idle state during which the mobile station stores final session information of a previous active state;

receiving the first message by the base station;

authenticating the first message by the base station using final session information of the mobile station that is previously stored in the base station;

transmitting a second message approving the fast network re-entry to the mobile station, the first message is authenticated; and

performing the fast network re-entry by the mobile station and the base station.

23. The method as claimed in claim 22, wherein the first message includes first information indicating that the network re-entry to be performed is the fast network re-entry, and second information indicating processes that must be omitted during the fast network re-entry from among a plurality of processes performed in a conventional network re-entry.

24. The method as claimed in claim 23, wherein the second message includes third information indicating approval of the fast network re-entry, and fourth information indicating the processes that must be omitted during the fast network re-entry from among the plurality of processes performed in the conventional network re-entry.

25. The method as claimed in claim 24, wherein the step of performing the fast network re-entry by the mobile station together with the base station, comprises:

omitting processes from among the plurality of processes performed in the conventional network re-entry based on the fourth information; and

performing only remaining processes.

26. The method as claimed in claim 22, wherein the first message is a ranging request message including first information and second information, the first information indicating that the network re-entry to be performed is the fast network re-entry, the second information indicating processes that must be omitted during the fast network re-entry from among a subscriber station basic capability negotiation process, a privacy key management process, a network address acquisition process, a time information acquisition process, and a TFTP (Trivial File Transfer Protocol) process, which are performed in a conventional network re-entry.

27. The method as claimed in claim 26, wherein the second message is a ranging response message including third information and fourth information, the third information indicating approval of the fast network re-entry, the fourth information indicating processes that must be omitted during the fast network re-entry from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, which are performed in the conventional network re-entry.

28. The method as claimed in claim 27, wherein the step of performing the fast network re-entry by the mobile station together with the base station, comprises:

omitting processes from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, which are performed in the conventional network re-entry, based on the fourth information; and

performing only remaining processes.

29. A method for fast network re-entry in a broadband wireless access communication system that includes the mobile station, a serving base station that provides service to the mobile station, a target base station, which is different from the serving base station, and an ASA (Authentication and Service Authorization) server connected to the target base station, the method comprising the steps of:

transmitting final session information from the mobile station to the target base station so that the target base station and the ASA server store the final session information, when the mobile station detects that handover from the serving base station to the target base station is necessary, after the mobile station stores the final session information while transitioning into an idle state;

receiving the final session information in the target base station;

storing the final session information in the target base station;

transmitting a first message requiring the fast network re-entry to the target base station;

receiving the first message by the target base station;

authenticating the first message by the target base station using final session information of the mobile station stored in advance in the target base station;

transmitting a second message approving the fast network re-entry to the mobile station, after authenticating the first message; and

performing the fast network re-entry by the mobile station and the target base station.

30. The method as claimed in claim 29, wherein the first message includes first information indicating that the network re-entry to be performed is the fast network re-entry, and second information indicating processes that must be omitted during the fast network re-entry from among a plurality of processes performed in a conventional network re-entry.

31. The method as claimed in claim 30, wherein the second message includes third information indicating approval of the fast network re-entry, and fourth information indicating the processes that must be omitted during the fast network re-entry from among the plurality of processes performed in the conventional network re-entry.

32. The method as claimed in claim 31, wherein the step of performing the fast network re-entry by the mobile station together with the target base station comprises:

omitting processes from among the plurality of processes performed in the conventional network re-entry, based on the fourth information; and

performing only remaining processes.

33. The method as claimed in claim 29, wherein the first message is a ranging request message including first information and second information, the first information indicating that the network re-entry to be performed is the fast network re-entry, the second information indicating processes that must be omitted during the fast network re-entry from among a subscriber station basic capability negotiation process, a privacy key management process, a network address acquisition process, a time information acquisition process, and a TFTP (Trivial File Transfer Protocol) process, which are performed in a conventional network re-entry.

34. The method as claimed in claim 33, wherein the second message is a ranging response message including third information and fourth information, the third information indicating approval of the fast network re-entry, the fourth information indicating processes that must be omitted during the fast network re-entry from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, which are performed in the conventional network re-entry.

35. The method as claimed in claim 34, wherein the step of performing the fast network re-entry by the mobile station together with the target base station comprises:

omitting processes from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, which are performed in the conventional network re-entry, based on the fourth information; and

performing only remaining processes.

36. A system for fast network re-entry in a broadband wireless access communication system, the system comprising:

a base station; and

a mobile station for transmitting a first message requiring fast network re-entry to the base station when the mobile station detects that it is necessary to perform network re-entry to the base station in an idle state during which the mobile station stores final session information of a previous active state, the mobile station performing the fast network re-entry together with the base station when receiving a second message approving the fast network re-entry from the base station,

wherein the base station receives the first message, authenticates the first message using final session information of the mobile station that is previously stored in the base station, transmits the second message to the mobile station, after authenticating the first message, and performs the fast network re-entry with the mobile station.

37. The system as claimed in claim 36, wherein the first message comprises:

first information indicating that the network re-entry to be performed is the fast network re-entry; and

second information indicating processes that must be omitted during the fast network re-entry from among a plurality of processes performed in a conventional network re-entry.

38. The system as claimed in claim 37, wherein the second message comprises:

third information indicating approval of the fast network re-entry; and

fourth information indicating the processes that must be omitted during the fast network re-entry from among the plurality of processes performed in the conventional network re-entry.

39. The system as claimed in claim 38, wherein the step of performing the fast network re-entry by the mobile station together with the base station comprises:

omitting processes from among the plurality of processes performed in the conventional network re-entry, based on the fourth information; and

performing only remaining processes.

40. The system as claimed in claim 36, wherein the first message is a ranging request message including first information and second information, the first information indicating that the network re-entry to be performed is the fast network re-entry, the second information indicating processes that must be omitted during the fast network re-entry from among a subscriber station basic capability negotiation process, a privacy key management process, a network address acquisition process, a time information acquisition process, and a TFTP (Trivial File Transfer Protocol) process, which are performed in a conventional network re-entry.

41. The system as claimed in claim 40, wherein the second message is a ranging response message including third information and fourth information, the third information indicating approval of the fast network re-entry, the fourth information indicating the processes that must be omitted during the fast network re-entry from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, which are performed in the conventional network re-entry.

42. The system as claimed in claim 41, wherein the fast network re-entry is performed by omitting processes from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, which are performed in the conventional network re-entry, based on the fourth information, and performing only remaining processes.

43. A system for fast network re-entry in a broadband wireless access communication system, the system comprising:

a target base station; and

a mobile station for storing final session information when transitioning into an idle state, transmitting the final session information to the target base station, such that the target base station and an ASA (Authentication and Service Authorization) server store the final session information, when the mobile station detects that handover from a serving base station to the target base station is necessary after the mobile station stores the final session information, transmitting a first message requiring fast network re-entry to the target base station, and performing the fast network re-entry with the target base station, when receiving a second message approving the fast network re-entry from the target base station;

wherein the target base station receives and stores the final session information, authenticates the first message using final session information of the mobile station stored in advance in the target base station, transmits the second message to the mobile station, after authenticating the first message, and performs the fast network re-entry together with the mobile station.

44. The system as claimed in claim 43, wherein the first message comprises:

first information indicating that the network re-entry to be performed is the fast network re-entry; and

second information indicating processes that must be omitted during the fast network re-entry from among a plurality of processes performed in a conventional network re-entry.

45. The system as claimed in claim 44, wherein the second message comprises:

third information indicating approval of the fast network re-entry; and

fourth information indicating processes that must be omitted during the fast network re-entry from among the plurality of processes performed in the conventional network re-entry.

46. The system as claimed in claim 45, wherein, when the mobile station and the target base station perform the fast network re-entry, processes from among the plurality of processes performed in the conventional network re-entry are omitted based on the fourth information and only remaining processes are performed.

47. The system as claimed in claim 43, wherein the first message is a ranging request message including first information and second information, the first information indicating that the network re-entry to be performed is the fast network re-entry, the second information indicating processes that must be omitted during the fast network re-entry from among a subscriber station basic capability negotiation process, a privacy key management process, a network address acquisition process, a time information acquisition process, and a TFTP (Trivial File Transfer Protocol) process, which are performed in a conventional network re-entry.

48. The system as claimed in claim 47, wherein the second message is a ranging response message including third information and fourth information, the third information indicating approval of the fast network re-entry, the fourth information indicating the processes that must be omitted during the fast network re-entry from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, which are performed in the conventional network re-entry.

49. The system as claimed in claim 48, wherein, when the mobile station and the target base station perform the fast network re-entry, processes from among the subscriber station basic capability negotiation process, the privacy key management process, the network address acquisition process, the time information acquisition process, and the TFTP process, which are performed in the conventional network re-entry, are omitted based on the fourth information;

and only remaining processes are performed.

50. A method for fast network re-entry of a base station in a broadband wireless access communication system, the method comprising the steps of:

transmitting to a mobile station in an active state a deregistration command message to request for transition into an idle state, wherein the deregistration command message includes session information for a fast network re-entry;

receiving a ranging request message from the mobile station to perform the network re-entry after the mobile station transit into the active state;

transmitting to the mobile station a ranging response message that includes the session information represents whether each network re-entry process among network re-entry procedure is omitted or required.

51. The method as claimed in claim 50, wherein the session information in the deregistration command message represents services for the mobile station and operational information to be retained or omitted.

52. The method as claimed in claim 50, wherein the network re-entry procedure includes a subscriber station basic capability negotiation process, a privacy key management process, a network address acquisition process, a time information acquisition process, and a TFTP (Trivial File Transfer Protocol) process, which are performed in a conventional network re-entry.