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By Hossam Afifi; Djamal Zeghlache

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Mainly we can enumerate the ATTACH, ACTIVATE PDP and ROUTING AREA UPDATE procedures. We describe them hereafter. 1. Attach procedure The ATTACH procedure is used in GPRS and UMTS to authenticate the user. In IGPRS attach procedure, the MN sends a Binding Update to the Access Router (AR) with a signature involving its secret key. This signature (called SRES in GPRS) is forwarded in a DIAMETER message to the AAAF. As explained before, the AAAF has to contact the AAAH to verify the identity. This may include a procedure to the HLR used in GSM networks.

While public groups, created by the service provider, are open to all users, private groups are created by individual users. Private groups may, in turn, be either open (similar to public groups) or closed. Having obtained permission (if needed) to join a group, a user may leave a group at any time at his choosing. Information about current membership of a group is available to a user once he joins a group and subscribes to the automatic notification service. 4 Shared content feature This feature enables a user or an operator to store arbitrary content, including pictures, music and other multimedia content, in his own storage area to share with others.

G. RADIUS or DIAMETER servers, charging, billing and policy servers). 323 systems alone. 323 and mobile networks”, it introduces necessary functionality that may be needed for user, terminal, service and service provider mobility. This includes specifying the necessary functional entities, the appropriate interfaces between them, and suitable protocols that may be used within an interface. 323 systems. 323 systems. 323 systems. In addition, any new functional entities that may be needed for this purpose will be introduced.

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