Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2011-03-01
2011-03-01
Ho, Duc C (Department: 2465)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S338000, C370S401000, C455S435100
Reexamination Certificate
active
07899036
ABSTRACT:
The present invention relates to assigning an S-CSCF to an un-registered user in an IMS network. A HSS maintains information about a registration state of users and about assignments of S-CSCF to the users. HSS determines if S-CSCFs are available to serve the users. When receiving a request associated with a user and requesting address of an S-CSCF assigned to the user, assignment of the S-CSCF for the user is removed from HSS if the S-CSCF has been determined not to be available and if the registration state of the user indicates that the user is not registered. The HSS may transmit Server Capabilities to an I-CSCF to enable the I-CSCF to re-select new S-CSCF to serve the user.
REFERENCES:
patent: 2005/0078642 (2005-04-01), Mayer et al.
patent: 2010/0217875 (2010-08-01), Belinchon Vergara et al.
patent: 2010/0223326 (2010-09-01), Noldus et al.
patent: WO 2006/016839 (2006-02-01), None
3GPP TS 23.228 V8.1.0, 3rdGeneration Partnership Project; Technical Specification Group Services and System Aspects; IP Multimedia Subsystem (IMS); Stage 2 (Release 8), Jun. 2007, a total of 226 pages.
XP-002470754 3GPP CT WG4 Meeting #36, “Discussion on the Failure of the S-CSCF”, C4-071026, Aug. 20-24, 2007, pp. 1-11.
XP-002430231 3GPP TSG-CT-1 Meeting #40, “Reassignment of S-CSCF During Terminating Call Procedure”, C1-051456, Oct. 31-Nov. 4, 2005, pp. 1-2.
ETSI TS 129 228 V7.3.0, Digital Cellular Telecommunications System (Phase 2+); Universal Mobile Telecommunications System (UMTS); IP Multimedia (IM) Subsystem Cx and Dx Interfaces; Signalling Flows and Message Contents (3GPP TS 29.228 version 7.3.0 Release 7), Sep. 2006, pp. 1-59.
ETSI TS 23.228 V8.0.0, 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; IP Multimedia Subsystem (IMS); Stage 2 (Release 8), Mar. 2007, pp. 1-224.
Ho Duc C
Nokia Siemens Networks Oy
Squire Sanders & Dempsey (US) LLP
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