Institute for Systems Research

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    Push-Based Information Delivery in Two Stage Satellite-Terrestrial Systems
    (2000) Ercetin, Ozgur; Tassiulas, Leandros; ISR; CSHCN
    Satellite broadcast data delivery has inherent advantages in providing global access to information to everyone. However, users of satellite communications need expensive and cumbersome equipment to receive and transmit satellite signals. Furthermore, as the amount of information being broadcast increases, average user latency increases as well. In many situations, users in a locality may have similar interests and hence they can be better served by a local broadcast schedule. A two stage satellite-terrestrial wireless broadcast system can provide more efficient service. In such a system, main server broadcasts information via satellite to the geographically distributed local ground stations. Every station has limited buffer capacity to store the items broadcast by the satellite. According to their cache content, and the interests of their users, local stations deliver the information to their users via terrestrial wireless channel. We develop novel methods for the joint cache management and scheduling problem encountered in these systems. Our results demonstrate that two stage systems can provide more efficient data delivery compared to the single stage systems.
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    Caching and Multicasting in DBS Systems
    (1999) Liu, Mingyan D.; Karir, Manish; Baras, John S.; Baras, John S.; ISR; CSHCN
    The use of Caching and Multicasting has been studied extensively inthe context of terrestrial networks. However, the use of thesetechnologies in a Direct Broadcast Satellite(DBS) system remains unclear.In this paper we discuss possible choices of caching and multicasting schemes, motivated by current applications in the terrestrial Internet,that could be considered for a DBS system. We examine their advantages and disadvantages as well as the tradeoffs involved in combinations of different approaches. We also propose some uses of these technologies and describe an architecture that enhances the performance and efficiency of a DBS system. This paper is published in the Proceedings of International Workshop on Group Communication, International Conference on Parallel Processing, September 1999.