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Olariu Stephan Ali Rizvi Syed Rashid Shirhatti Rajendra Todorova Petia 《Telecommunication Systems》2003,22(1-4):151-168
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 platform for Personal Communication Services (PCS). LEO satellites are expected to support multimedia traffic and to provide their users with the negotiated Quality of Service (QoS). 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. One important mobility problem is the intra-satellite handoff management. The main contribution of this work is to propose Q-Win, 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 Q-Win is compared to that of two 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, good call blocking probability for new call requests, while maintaining bandwidth utilization high. 相似文献
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Kandpal Manoj Shirhatti Vijay Singh Jaspreet Sontakke British Ashok Jejusaria Alok Arora Satay Pal Singh Singh Surinder 《Journal of Materials Science: Materials in Electronics》2022,33(27):21287-21296
Journal of Materials Science: Materials in Electronics - This paper reports, the impact of high-temperature annealing on temperature coefficient of resistance (TCR) of platinum thin films, by using... 相似文献
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