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The characteristics of multi-coverage of multilayer satellite networks make sure of good validity and reliability of the space-based networks. Walker delta type constellation guarantees permanent inter satellite links between satellites in the same layer and provides nonpermanent inter orbit links, both of which make an autonomic satellite backbone. As a integrated services network, multiplayer satellite...
Output queuing is well known for its ability to provide quality-of-service (QoS) guarantees. Unfortunately, the high-speed memory requirements of output queued (OQ) switch limit its use for large capacity switching architecture. A lot of work in literature has investigated how to emulate OQ switch with other switch architectures. A novel approach is constructing switches with buffered crossbars. However,...
To provide visual communication over enterprise leased line, the remote video surveillance system should be a suitable architecture to take the place of analog video model. The paper gives a reference design of remote digital video monitor system based on embedded system and dual core processors which can apply to IP-based video system. It has the merits of low cost and high quality for digital video...
Based on Globalstar and Odyssey systems, which are two well-known Walker delta type constellations, ISL networks are constructed and dynamic characteristics of inter orbit links are analyzed. Pointing, acquisition and tracking (PAT) subsystem on-board has close relationship with azimuth angle, elevation angle and ISL length whose variance is important to transponder power control system. Multi-coverage...
Polar and quasi-polar orbit constellations have "seams" between counter-rotated orbits, and ISLs need switch off above the polar regions. Satellite communication networks made up of Walker constellations have steady topology and good ISL performance. Adaptive routing strategy uses path-weight instead of delay or delay jitter as a criterion to select a path under three service models. Numerical...
Walker delta type constellation is an excellent candidate to compose non-geostationary orbit satellite communication networks. LEO and MEO satellite networks composed by Walker delta constellations have many excellent characteristics respectively and the elevation angle, azimuth angle and length of ISLs in these two systems are studied especially. Using different routing strategy in order to fulfil...
The convergence of diverse traffic requires modern networks to provide QoS (Quality of Service) solutions to time-critical applications. Due to its simplicity and scalability, the differentiated service (DiffServ) solution is expected to be widely deployed across the Internet. In this paper, we propose a distributed DiffServ supporting scheduling (DDSS) scheme based on buffered crossbar switches....
In packet switching network such as asynchronous transfer mode (ATM), the switching characteristics is important in delivering the guaranteed QoS (Quality of Service) level of the network. Many methods have been developed to control cell flow for shared bandwidth. The first-in first-out (FIFO), static priority (SPR), dynamically weighted priority scheduling (DWPS) (T. Lizambri, F. Duran, and S. Wakid,...
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