Probability based dynamic channel reservation strategy for reliable handoff in multimedia LEO satellite communications

Low earth orbit (LEO) satellites are deployed to provide global coverage and complement the performance of terrestrial wireless networks. In this paper, we propose a novel bandwidth allocation strategy along with a connection admission control technique aiming at improving the utilization of network resource and providing the network with better QoS guarantees such as new connection blocking probability (CBP) and handoff connection dropping probability (CDP) in multimedia LEO satellite networks. Our connection admission control scheme that we call the probability based dynamic channel reservation strategy (PDR) dynamically reserve bandwidth for real-time services based on their handoff probability, and the reserved bandwidth for real-time handoff connection can also be used by new connections under a certain probability determined by the mobility characteristics and bandwidth usage of the system. Simulation results have shown that, compared with other bandwidth allocation schemes, our scheme not only lowers the CDP for Class I real-time service, but also maintains the CBP to certain degree, thus offers very low call dropping probability for real-time connections while, at the same time, keeping resource utilization high