Institute for Systems Research

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Author: search.filters.author.Karir, ManishSubject: search.filters.subject.simulation

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    A Simulation Study of Enhanced TCP/IP Gateways for Broadband Internet over Satellite
    (1999) Karir, Manish; Liu, Mingyan D.; Barrett, Bradley A.; Baras, John S.; Baras, John S.; ISR; CSHCN
    The demand for Internet bandwidth has been growing rapidlyover the years and the use of high-bandwidth satellites has been proposed as one possible solution to meet the increasingdemand.

    However, there are certain performance problems withproviding Internet over satellite due to the nature of TCP/IP protocol suite and the satellite link characteristics. In this paper, we describe a simulation study of an architecture for improving the performance of TCP/IP over satellite links.

    On each end of the satellite link, there are gateways that split the TCP connection so that the satellite link is transparent to the end hosts.

    The split TCP connection over the satellite segment is then optimized.TCP congestion control is maintained on each segment of the split connection.

    We simulated such an architecture in OPNET and present results showing improved throughput over the satellite link.

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    Hybrid Internet Simulation Testbed
    (1999) Liu, Mingyan D.; Karir, Manish; Raissi-Dehkordi, Majid; Baras, John S.; Baras, John S.; ISR; CSHCN
    Internet technology as a widely accepted modern telecommunicationstandard has been widely extended to combine with numerous othertechnologies, e.g., satellite, ATM, wireless. This is whatwe term Hybrid Internet. Along with this technology emerging,various enhancements and alterations of standard TCP/IP for differentpurposes have been proposed and studied intensively. More and morefrequently we are facing the question of how to choose from thesedifferent schemes to design a system for a particular purpose, whichwould inevitably involve the interaction and trade-off study. We believethat simulation is a powerful tool for this type of work.In this paper, we describeour implementation of a Hybrid Internet testbed which includesa series of traffic models and TCP/IP enhancements.The goal of our work is to makea set of reusable modules upon which we can build complex systemsto study the standard protocols and their variations.We also present application examples using these module components.