Method and apparatus for re-registration of connections for service ...

(65) Prior Publication Data

US 2008/0089308 Al Apr. 17, 2008

(51) Int. CI.

H04W4/00 (2009.01)

(52) U.S. CI 370/338; 370/328; 455/433;

455/435.1

(58) Field of Classification Search 455/410 411;

370/338

See application file for complete search history. (56) References Cited

U.S. PATENT DOCUMENTS

Active sessions and dialogs may be moved between connections and P-CSCFs. For example, in some embodiments either new bindings may be created with a different connection for a Public User ID or the UE may re-register one or more specific bindings for a Public User ID from one connection to another. The capabilities improve service continuity when handing over between IP-CANs. FIG. 13 illustrates exemplary messaging for moving bindings to a new connection for a Private User ID between UE (1305) and P-CSCF (1307) when the UE (1305) is in a visited IP-CAN, that is, visited network (1303). The UE (1305) invokes the unprotected global seamless re-registration of the embodiments via an unprotected initial registration procedure wherein the UE (1305) includes a "seamless-ims" parameter in the Require and Proxy-Require headers of the REGISTER request (1313). The S-CSCF (1311) provides the capability to subsequently re-register bindings over new or existing connections.

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* cited by examiner