Performance evaluation of LEO satellite constellations with inter‐satellite links under self‐similar and Poisson traffic (original) (raw)
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Many Transmission Control Protocol (TCP) versions have been proposed and some are in use today for terrestrial wired networks over the Internet Protocol (IP), e.g. Tahoe, Reno and many others. TCP/IP is being studied to overcome its limitations within the satellite medium and to allow its use in hybrid terrestrial/satellite networks. Studies mainly concentrate on use of Geostationary Earth Orbit (GEO) constellations. However interest in use of Low Earth Orbit (LEO) constellations is increasing, especially for multimedia transmissions within the UMTS (Universal Mobile Telecommunications System). This paper aims at providing some TCP performance results in a satellite scenario, both with GEO and LEO satellites. First it discusses some main problems of adaptation of the protocol to a satellite environment. Then it presents basic characteristics of some main TCP versions. Finally, it provides simulation results for goodput in case of LEO polar and inclined constellations. Results are provided both for an unshadowed scenario and for shadowed scenarios. They show the robustness of TCP even in a built-up environment with significant goodput levels at the data rate 128 kbit/s up to average obstructions elevation angles of about 30°-40°, especially when satellite diversity is adopted.