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Mobile multimedia services are expected to be in high demand from mobile wireless users on a worldwide scale. The research community and telecommunications industry have focused their efforts in providing suitable wireless networks for such services. The great advance achieved among wireless local area network (WLAN) technologies, combined with the current delays in deploying 3 G cellular networks, forces the network operators to investigate possible interworking mechanisms to exploit the broadband capabilities of WLANs jointly with currently deployed 2.5 G cellular networks, as well as other commercial broadband systems. The authors present a generic management platform, suitable for WLANs interworking with other wireless systems, targeting the implementation of a high-speed wireless environment and able to maintain multimedia services, especially at hot-spot locations. The main aim was to keep the functional layout of each individual wireless network as close as possible to its original form. Finally, the authors present examples of WLANs interworking with other wireless systems, using either real commercially deployed networks or laboratory testbeds.
Recently, wireless LAN systems have been widely deployed for public mobile Internet services. Public wireless LAN systems can provide high speed Internet connectivity using portable devices such as laptop computers, personal digital assistants (PDAs), etc. In public wireless LAN systems, reliable user authentication and mobility support are essential issues. However, re-authentication during handoff procedures causes long handoff latency and this affects the quality of service in real-time multimedia applications. A fast handoff scheme based on mobility prediction is proposed. In this scheme, a mobile host entering the area covered by an access point (AP) performs authentication procedures for multiple APs, rather than just the current AP. These multiple APs are selected by a prediction method called the frequent handoff region (FHR) selection algorithm, which takes into account users' mobility patterns, service classes, etc. Since a mobile host is registered and authenticated for an FHR in advance, handoff latency resulting from re-authentication can be significantly reduced. Simulation results show that the proposed scheme is more efficient than other schemes in terms of handoff delay and buffer requirements.
The SIM (Subscriber Identity Module) transformed the smartcard business as mobile phones started to flourish and each had to carry one. But, as the networks become increasingly complex, offering a multiplicity of capabilities to the users-multimedia applications, high-performance processing, large storage and commerce-the complexity of the SIM grows, too. The USIM (Universal Subscriber Identity Module) will improve the relationship with the users and it's a good candidate to enable content delivery. The USIM is expected to offer higher capacities, going into the megabyte domain, to be able to store even more data to meet the growing number of applications in its pitch to be 'all things to all people'.
