RECOVERY TECHNIQUES IN MOBILE NETWORKS

• US 20110199978A1
• Filed: 04/29/2011
• Published: 08/18/2011
• Est. Priority Date: 03/12/2001
• Status: Active Grant

• Current Assignee: CommWorks Solutions, LLC (IP Investments Group LLC)
• Original Assignee: Intellectual Ventures I LLC (Intellectual Ventures LLC)
• Inventors: Faccin, Stefano, Verkama, Markku, Phan-Anh, Son, Einola, Heikki Juhani, Benko, Balint, Hartikainen, Auvo
• Granted Patent: US 8,200,211 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 8/30 Network data restoration; Network data reliability; Network data fault tolerance

Abstract

A technique for protecting location information of a subscriber in a mobile network is disclosed. A User Mobility Server (UMS) receives a first query from a first call state control function (CSCF). The UMS transmits a call setup and a subscriber identity to a servicing-call state control function (S-CSCF). The S-CSCF may have no record of the subscriber identity due to a restart are some other event. The UMS receives a second query from the S-CSCF based in part of the subscriber identity. The UMS transmits a home address of a mobile station to the S-CSCF. The UMS may also transmit a profile download to the S-CSCF.

Claims

1. A method comprising:

receiving a first query at a user mobility server (UMS) from a first call state control function (CSCF);

transmitting a call setup and a subscriber identity (SI) to a servicing-call state control function (S-CSCF) from the UMS;

receiving a second query at the UMS from the S-CSCF based at least in part on the SI; and

transmitting a home address of a mobile station to the S-CSCF from the UMS.

2. The method of claim 1, where the second query indicates that a restart took place at the S-CSCF.

3. The method of claim 2, further comprising transmitting a profile download to the S-CSCF from the UMS.

4. The method of claim 1, wherein the first query is a route request.

5. The method of claim 1, wherein the first query is based at least in part on an alias dialed by the mobile station.

6. The method of claim 5, wherein the mobile station is an internet protocol based terminal for which an internet protocol version 6 (IPV6) address is stored on the UMS.

7. The method of claim 1, further comprising transmitting an address of the S-CSCF and the SI from the UMS to the first CSCF.

8. A computer readable medium having instructions stored thereon, the instructions comprising:

instructions for receiving a first query at a user mobility server (UMS) from a first call state control function (CSCF);

instructions for transmitting a call setup and a subscriber identity (SI) to a servicing-call state control function (S-CSCF) from the UMS;

instructions for receiving a second query at the UMS from the S-CSCF based at least in part on the SI; and

instructions for transmitting a home address of a mobile station to the S-CSCF from the UMS.

9. The computer readable medium of claim 8, where the second query indicates that a restart took place at the S-CSCF.

10. The computer readable medium of claim 9, further comprising instructions for transmitting a profile download to the S-CSCF from the UMS.

11. The computer readable medium of claim 8, wherein the first query is a route request.

12. The computer readable medium of claim 8, wherein the first query is based at least in part on an alias dialed by the mobile station.

13. The computer readable medium of claim 12, wherein the mobile station is an internet protocol based terminal for which an internet protocol version 6 (IPV6) address is stored on the UMS.

14. The computer readable medium of claim 8, further comprising instructions for transmitting an address of the S-CSCF and the SI from the UMS to the first CSCF.

15. A system comprising:

an Interrogating-Call State Control Function (I-CSCF) configured to send a first query to a User Mobility Server (UMS);

the UMS configured to;

receive the first query from the I-CSCF,

transmit a call setup and a subscriber identity (SI) to a servicing-call state control function (S-CSCF),

receive a second query from the S-CSCF based at least in part on the SI, and

transmit a home address of a mobile station to the S-CSCF; and

the S-CSCF configured to;

receive the call setup from the UMS;

transmit the second query to the UMS.

16. The system of claim 15, where the second query indicates that a restart took place at the S-CSCF.

17. The system of claim 16, wherein the UMS is further configured to transmit a profile download to the S-CSCF.

18. The system of claim 15, wherein the first query is a route request.

19. The system of claim 15, wherein the first query is based at least in part on an alias dialed by the mobile station.

20. The system of claim 19, wherein the mobile station is an internet protocol based terminal for which an internet protocol version 6 (IPV6) address is stored on the UMS.

21. The system of claim 15, wherein the UMS is further configured to transmit an address of the S-CSCF and the SI to the first CSCF.