Cooperative Handoff Management for Mobile Networks
Date Issued
2009
Date
2009
Author(s)
Pan, Yu-Chun
Abstract
Employing multiple radio access technologies such as WiMAX, HSDPA and Wi-Fi in a mobile network to provide users with more cost-effective communication services has long been a vision of many service network providers. In this thesis, we propose a security roaming solution in handover scenario and provide a novel user-decided service model in a cooperative wireless network environment and in the last, we based on user-decided service model, proposed a QoS guaranteed solution in vertical handoff scenario. When the radio resources of multiple wireless networks are collectively managed, four issues are raised in such a communication environment: a) service users would like to have IP-based roaming capability as they move rather than being constrained to a single spot or being forced to disconnect because his/her service provider does not have entire coverage of the city/region; b) the need on security and accounting management for mobile Internet; and c) the execution of AAA however would incur extra delay to handoff latency. For applications like VoIP, video streaming and TCP connections, it may disrupt the on-going communications if such latency becomes too large. d) within these versatile reless technologies, how can mobile users choose the suitable wireless network to move in. In this work, we propose an AAA-enabled roaming alliance architecture that provides fast and secure universal roaming service across multiple service domains. The associated protocols and the supporting security mechanisms are also proposed. Our design provides continuing communications service to mobile user belonging to different service operators to quickly and securely access service when roaming across multiple service domains. Mobile users only need to carry a U-Mobile Token to receive the service. The schemes proposed only incur minimal latency in security check. This is particularly important to the support of real-time mobile applications. or the novel user-decided service model which provided with multiple service options with different levels of service quality and charges. It is up to users to choose the most suitable service option (and access network) based on their personal preference and the amount of money they are willing to pay. We use a video streaming service in a WiMAX/HSDPA network as an example to illustrate the key concepts and resource management of our approach. The results of simulation show that, under the model, the service network can accommodate more users and provide higher user satisfaction than the traditional network-decided service model. It can also achieve higher resource utilization and revenues. We also extend this service model to vertical handoff service, besides providing seamless handoff, also keep the QoS service level as in the original network.
Subjects
cooperative
roaming
AAA
user-decided
service model
vertical handoff
service level
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