By Vaduvur Bharghavan, Alan Demers, Scott Shenker, Lixia Zhang
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Extra info for MACAW: A Media Access Protocol for Wireless LANs
Sample text
As the users are not fully identified, they cannot be easily charged (unless they are on a Pre-pay service). However, local services can be based on advertising, calling party charging, or users’ ability to pay in another way. With minimal local authentication, users are allowed to use Visited Network services that operate from a Local Application Server (AS). 7 illustrates Option 2. (3) A third option is a service that involves a local network AS. This AS may be contacting another AS in the Home Network to complete the service.
Terminal mobility is independent of the user and is concerned with the identification of the hardware or firmware rather than the user. 2 IMS User Mobility A prime principle in IMS is User Mobility. As in wireless networks, users can appear in different spots on the IP network. The network must associate the IMS user profile with the current equipment being used by that user, and attach the user’s equipment through authentication and authorization processes that assign an IP address and bind it to a user account.
The separation of services from session control facilitates easy modification and roll-out of services. The flexible structure of the user data central repository in IMS enables storing user-specific service triggers and parameters. The ability to merge in Web-based services and utilize user-generated content allows for infinite variations.