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An adaptive MAC layer protocol for ATM-based LEO satellite networks

: Emmelmann, M.; Bischl, H.


IEEE Vehicular Technology Society -VTS-:
IEEE 58th Vehicular Technology Conference, VTC 2003-Fall. Proceedings. Vol.4 : 6 - 9 October 2003, Orlando, Florida, USA
Piscataway, NJ: IEEE Operations Center, 2004
ISBN: 0-7803-7954-3
Vehicular Technology Conference (VTC Fall) <58, 2003, Orlando/Fla.>
Conference Paper
Fraunhofer FOKUS ()

German Aerospace Center (DLR), Fraunhofer FOKUS.cats, and Tesat-Spacecom have designed a future multimedia ATM-based LEO satellite network. Part of the development was an adaptive MAC and FEC scheme which is presented in this paper. The FEC implementation switches on the fly during a connection between several FEC and modulation modes to guarantee a maximum ATM cell error rate of 10 -6. In order to prevent influences of the changing FEC scheme on the user-level data rate, the MAC dynamically changes its packet lengths. Additionally, to minimize contention on the up-link, the MAC structures its TDMA frame into a fixed assigned part and a contention specific part. The boarder in between the two is dynamically altered according to the current link utilization.