Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-07-05
2011-11-08
Afshar, Kamran (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S435200, C455S433000, C455S443000, C455S444000, C455S445000, C455S448000, C455S518000, C455S519000, C455S456100, C455S457000
Reexamination Certificate
active
08055262
ABSTRACT:
Several embodiments of an IMS communications network are disclosed. In one embodiment, the network comprises a plurality of dispatch application servers (DAS), an S-CSCF, and an event notification server. The S-CSCF is adapted to receive an IMS registration request from a dispatch client, authenticate the registration request, send a registration confirmation to the dispatch client, and send a notification indicating the registration of the dispatch client to an event notification server. The event notification server is adapted to receive the notification from the S-CSCF, select a DAS, and send a notification to the selected DAS indicating an assignment to provide dispatch service to the dispatch client. In another embodiment, the registration notification to the event notification server is sent from the dispatch client, instead of the S-CSCF.
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3GPP TS 23.228, V6.6.0, (Jun. 2004; IP Multimedia Subsystem (IMS) Stage 2, Release 6.
Bui Hung
Choksi Ojas
Kalathur Ramesh
Kuan David
Stoler Moshe
Afshar Kamran
Nextel Communications Inc.
Shaheed Khalid
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