Recovery techniques in mobile networks
View Patent ↗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.
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 non-transitory 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 non-transitory computer readable medium of claim 8 , where the second query indicates that a restart took place at the S-CS CF.
10. The non-transitory computer readable medium of claim 9 , further comprising instructions for transmitting a profile download to the S-CSCF from the UMS.
11. The non-transitory computer readable medium of claim 8 , wherein the first query is a route request.
12. The non-transitory 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 non-transitory 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 non-transitory 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.