Institute for Systems Research

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Author: search.filters.author.Baras, John S.Subject: search.filters.subject.DBS

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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.
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    Extensions of DBS and Hybrid Internet
    (1997) Karir, Manish; Bharadwaj, Vijay G.; Holleman, Keith; Suphasindhu, Narin; Papademetriou, Spyro; Baras, John S.; ISR; CSHCN
    There has been a large amount of research dedicated to extending the asymmetric networks provided by receive-only Direct Broadcast Satellite systems like Hughes Network Systems' DirecPC product. One way to further develop Direct Broadcast Satellite services and to offset the high initial cost of these systems is to implement techniques that will allow one satellite receiver to act as a gateway for many clients to receive information. This would also help broaden the range of services provided by DBS systems. Besides providing direct-to-home traffic, DBS can be used to distribute bulk traffic to the local-loop distributors (direct-to-curb). We describe some experiments which extend the DBS system, in particular, the DirecPC and DirecTV DBS, by using the PC with the satellite receiver as a gateway to connect networks together. We also discuss simple methods of receiving multimedia traffic from the multicast backbone (MBONE) [Cas94] over the satellite link, and distributing it, through this gateway, to end users.

    The research and scientific content in this material will be presented at the 2nd ACM International Workshop on Satellite-Based Information Services (WOSBIS), October 1, 1997, Budapest, Hungary.