A Two-Cell-Lookahead Call Admission and Handoff Management Scheme for Multimedia LEO Satell.pdf

Proceedings of the 36th Hawaii International Conference on System Sciences - 2003A Two-Cell-Lookahead Call Admission and Handoff Management Scheme for Multimedia LEO Satellite Networks Petia Todorova?, Stephan Olariu? and Hoang Nam Nguyen? ?FhG-Fokus, Kaiserin-Augusta-Allee 31, D-10589 Berlin, Germany ?Department of Computer Science, Old Dominion University, Norfolk, VA 23529, U.S.A. ? Institute of Communication Networks, TU Vienna, Favoritenstrasse 9-388, Vienna, Austria Abstract The main contribution of this work is to propose a novel call admission and handoff management scheme for LEO satellite networks. A key ingredient in our scheme is a companion predictive bandwidth allocation strategy that exploits the topology of the network and contributes to maintaining high bandwidth utilization. Our bandwidth allocation scheme is specifically tailored to meet the QoS needs of multimedia connections. The performance of our scheme is compared to that of various bandwidth allocation schemes proposed in the literature. Simulation results show that, compared with the other bandwidth allocation schemes, our scheme offers low call dropping probability (CDP), providing for reliable handoff of on- going calls and acceptable call blocking probability (CBP) for new calls. 1. Introduction In response to increasing demands for truly global coverage needed by Personal Communication Services (PCS), a new generation of mobile satellite networks intended to provide anytime-anywhere communication services was proposed in the literature [Aky97, Del00, Lug99]. Low Earth Orbiting (LEO) mobile satellite networks, deployed at altitudes ranging from 500 km to 2000 km, are well suited to handle bursty Internet and multimedia traffic and to offer low cost access to end- users equipped with hand-held devices. LEO satellite networks offer numerous advantages over terrestrial networks, such as global coverage, low cost-per-minute access time,