d line equipment such as desktops that can access the Internet, and the number of mobile devices is expected to continue to grow more rapidly than fixed line devices. Mobile terminals will be the most commonly used devices for accessing and exchanging information as well as e-commerce [10]. This trend is viewed as the integration and convergence of information technology, telecommunications, and content. This trend has resulted in new service delivery dynamics and a paradigm shift in telecommunications that will benefit both end users and service providers [10]. The following general requirements are applied to telecommunication services and applications, noting that the requirements may be different from one service offering to another: Seamless and continuous connectivity, as well as seamless handover across heterogeneous networks to support a wide range of user mobility from stationary to high speed. This includes mobility management and inter-system interoperability when users are in multi-mode service [11]. Low power consumption in multi-mode devices through complexity and size reduction. Application scalability and quality of service to maintain services despite changes of radio channel condition by adapting the data rate and/or the error tolerance of the application. Security and data integrity for multimedia and e-commerce applications. In the latter, authentication of user information integrity and protection of user information are required to support high security services and prevent security breaches. Prioritization for applications with urgency such as emergency/disaster. Such applications require higher priority than other applications and support of prioritization of access to network resources. Location determination capability and accuracy to enable certain location-dependent applications. An important aspect of this capability is the ability to protect the privacy information of the user. Broadcast and multicast and efficient support for point-to-multipoint transmission is required because broa