Method for introducing switched virtual connection call redundancy in asynchronous transfer mode networks

• US 6,724,756 B2
• Filed: 01/12/1999
• Issued: 04/20/2004
• Est. Priority Date: 01/12/1999
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Fourie, Henry L., Lau, Chun-Hung
• Primary Examiner(s): TON, DANG T
• Application Number:
  US09/229,150
• Publication Number:
  US 20010002193A1
• Time in Patent Office: 1,925 Days
• Field of Search: 370/216, 370/217, 370/218, 370/219, 370/220, 370/221, 370/360, 370/386, 370/389, 370/390, 370/392, 370/395, 370/395.1, 370/503, 370/350, 370/351, 370/352, 370/401, 379/269, 379/242, 379/268, 709/223, 709/200, 709/213, 709/217, 709/218, 709/220, 709/226
• US Class Current: 370/360
• CPC Class Codes: H04L 2012/5626 Network management, e.g. Intelligent nets
• CPC Class Codes: H04L 2012/5627 Fault tolerance and recovery
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A method for sharing a call record between a first controller and a second controller is disclosed. The method comprises the step generating the call record in the first controller. For one embodiment, the call record comprises call parameters operable to establish a call connection between the first controller and a remote controller. The method also comprises the step of transferring the call record to the second controller. For one embodiment, the second controller performs as a stand-by controller and is able to take over the operations of the first controller in the event of failure of the first controller.

Claims

1. A method for sharing a call record between a first controller and a second controller, the method comprising:

generating the call record in the first controller, wherein the call record comprises call parameters operable to establish a call connection between one of the first controller or the second controller and a remote controller, the remote controller residing in a different node than the first and second controllers; and

transferring the call record to the second controller.

2. The method of claim 1, wherein the call parameters are further operable to synchronize communication between one of the first controller or the second controller and a switch coupled to the first controller and the second controller.

3. The method of claim 1, wherein the call parameters are further operable to synchronize communication between one of the first controller or the second controller and the remote controller.

4. The method of claim 1, further comprising deleting the call record, wherein the call record is deleted subsequent to a call release message received by the first controller.

5. The method of claim 1, wherein the second controller is operable to perform as a stand-by controller.

6. The method of claim 4, wherein the call record is transferred to the second controller after the call connection between the first controller and the remote controller reaches a first phase.

7. The method of claim 6, wherein the first phase comprises an active phase.

8. The method of claim 6, wherein the call record is deleted in a second phase.

9. The method of claim 8, wherein the second phase comprises a release phase.

10. A method for reducing call termination in a network having a plurality of nodes, the method comprising:

generating a plurality of call records in a first controller of a first node of the plurality of nodes, wherein the call record comprises a set of call parameters of a plurality of active calls, wherein the set of call parameters comprises a plurality of call reference numbers, each call reference number of the plurality of call reference numbers corresponding to an active call of the plurality of active calls; and

transferring the plurality of call records to a second controller in the first node, wherein the second controller is operable to maintain the plurality of active calls.

11. The method of claim 10, wherein the second controller is operable to maintain the plurality of active calls in the event of failure in the first controller.

12. The method of claim 10, wherein the second controller is operable to synchronize communication with an adjacent node of the plurality of nodes.

13. The method of claim 12, wherein the synchronization of communication with the adjacent node comprises comparing a call parameter between the second controller and a third controller of the adjacent node.

14. The method of claim 10, wherein the second controller is operable to synchronize communication with a switch of the first node.

15. The method of claim 14, wherein the synchronization of communication with the switch comprises comparing a call parameter between the second controller and the switch.

16. The method of claim 15, wherein the call parameter comprises a switch interface number stored in the call record.

17. The method of claim 15, wherein the call parameter comprises a channel number stored in the call record.

18. A method of call management, comprising:

handling an active call by a first node using an active controller and a first switch;

switching to a standby controller of the first node in response to a failure of the active while maintaining the active call; and

synchronizing the standby controller of the first node to a second switch in an adjacent node subsequent to the switching, wherein each of the first node and the adjacent node have their own active controller and standby controller.

19. The method of claim 18, further comprising resynchronizing the standby controller with a remote controller in the adjacent node subsequent to the switching.

20. A method of claim 19, further comprising auditing the standby controller to determine whether the active call should be terminated.

29. The method of claim 18, wherein synchronizing comprises synchronizing a call database of the standby controller with a cross-connect database of the adjacent switch.

21. A machine readable medium having stored thereon instructions which when executed by a processor cause the processor to perform the following:

generating a call record in a first controller, wherein the call record comprises call parameters operable to establish a call connection between one of the first controller or a second controller and a remote controller, the remote controller residing in a different node than the first and second controllers; and

transferring the call record to the second controller.

22. The machine readable medium of claim 21, wherein the call parameters are further operable to synchronize communication between one of the first controller or the second controller and a switch coupled to the first controller and the second controller.

23. The machine readable medium of claim 21, wherein the call parameters are further operable to synchronize communication between one of the first controller or the second controller and the remote controller.

24. The machine readable medium of claim 21, further comprising deleting the call record, wherein the call record is deleted subsequent to a call release message received by the first controller.

25. A network node, comprising

means for generating a call record in a first controller, wherein the call record comprises call parameters operable to establish a call connection between one of the first controller or a second controller and a remote controller, the remote controller residing in a different node than the first and second controllers;

and

means for transferring the call record to the second controller.

26. The network node of claim 25, further comprising means for synchronizing communication between one of the first controller or the second controller and a switch coupled to the first controller and the second controller.

27. The network node of claim 25, further comprising means for synchronizing communication between one of the first controller or the second controller and the remote controller.

28. The network node of claim 25, further comprising means for deleting the call record subsequent to a call release message received by the first controller.