2WIN: an efficient call admission control scheme for quality of service in broadband multimedia LEO satellite networks

ABSTRACT

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 ensuring global coverage, LEO satellite systems support communications with hand-held devices and offer low cost access, making them promising platforms for military communications and for Personal Communication Services (PCS). The main contribution of this work is to propose 2WIN (Two Windows), an efficient call admission control scheme for multimedia LEO satellite networks. Instead of maintaining priority queues and making resource reservations in a number of cells that the user is likely to visit, 2WIN relies on a lightweight call admission mechanism that uses a pair of back-to-back virtual windows. The performance of 2WIN is compared with three related schemes. Simulation results show that our new scheme offers excellent quality of service (QoS) for multimedia traffic, featuring a very low call dropping probability, providing for reliable handoff of on-going calls, as well as a low call blocking probability for new call requests, while still ensuring high bandwidth utilization.

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