Date of Award

Fall 12-2005

Document Type


Degree Name

Master of Science (MS)


Computer Science

Committee Director

Stephen Olariu

Committee Member

Larry Wilson

Committee Member

Mona Rizvi

Call Number for Print

Special Collections LD4331.C65 R597 2005


Low Earth Orbit (LEO) satellite networks are deployed as an enhancement to terrestrial wireless networks in order to provide broadband services to users regardless of their location. In addition to global coverage, these satellite systems support communications with hand-held devices and offer low cost-per-minute access cost, making them promising platforms for Personal Communication Services (PCS). LEO satellites are expected to support multimedia traffic and to provide their users with some form of Quality of Service (QoS) guarantees. However, the limited bandwidth of the satellite channel, satellite rotation around the Earth and mobility of end-users makes QoS provisioning and mobility management a challenging task. The main contribution of this work is to propose RADAR - Refined Admission Detecting Absence Region, a novel call admission control and handoff management scheme. 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 RADAR is compared to that of three recent schemes proposed in the literature. Simulation results show that our scheme offers low call dropping probability, providing for reliable handoff of on-going calls, and good call blocking probability for new call requests, while ensuring high bandwidth utilization.


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