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Wang H.,Beijing University of Posts and Telecommunications | Zhang Q.,Beijing University of Posts and Telecommunications | Zhang Q.,State Key Laboratory of Information Photonics and Optical Communication BUPT | Xin X.,Beijing University of Posts and Telecommunications | And 5 more authors.
Journal of Information and Computational Science | Year: 2012

The Quality of Service (QoS) related concepts of Data Over Cable Interface Specification (DOCSIS) are studied and performance improvements based on DOCSIS for Geostationary Orbit (GEO) satellite networks are proposed. A predictive method that can forecast how many data packets will arrive in the MAC layer is adopted. Moreover, the request/grant mechanism in DOCSIS is analyzed when it is used in GEO satellite networks. The simulation results show that the request/grant mechanism in DOCSIS is not suitable for GEO satellite networks. The improvement based on the request/grant mechanism is proposed in this paper. In addition, the fragmentation flowchart in DOCSIS is redesigned and the simulation result shows that it has a better performance. Copyright © 2012 Binary Information Press. Source


Wang H.,Beijing University of Posts and Telecommunications | Wang H.,State Key Laboratory of Information Photonics and Optical Communication BUPT | Zhang Q.,Beijing University of Posts and Telecommunications | Zhang Q.,State Key Laboratory of Information Photonics and Optical Communication BUPT | And 6 more authors.
Journal of Theoretical and Applied Information Technology | Year: 2013

Compared with Geostationary Orbit (GEO) satellite systems and Medium Earth Orbit (MEO) satellite systems, Low Earth Orbit (LEO) satellite systems provide lower propagation delay as well as higher throughput. Because of these reasons, LEO satellite systems can play a pivotal role in providing services to areas where there is no substantial terrestrial infrastructure. In this paper, a novel kind of Dynamic On-demand Multipath Routing algorithm (DOMR) is proposed for LEO satellite networks. The performance of LEO satellite networks based on DOMR algorithm is simulated and analyzed. Moreover, the packet delivery ratio of LEO satellite networks when running DOMR and Dynamic Source Routing Algorithm for LEO Satellite Networks (DSR-LSN) is compared. The packet delivery ratio is about 6.39% higher when running DOMR. Simulation results show that on-demand multipath routing algorithm has a good performance in drop rate and the end-to-end delay of packet delivery. © 2005 - 2013 JATIT & LLS. Source

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