Comparative performance of the CFDAMA protocol via satellite with various terminal request strategies
Paul Mitchell, David Grace, Tim C. Tozer · 2002
This paper examines the relative performance of the Combined Free/Demand Assignment Multiple Access (CFDAMA) protocol with different terminal request strategies. A new scheme is proposed employing round robin assignment of request slots (CFDAMA-RR), which is compared with the standard schemes incorporating random, packet accompanied, and Combined Requests (CFDAMA-CR). It is shown that the CFDAMA-RR scheme can offer improved delay/utilisation performance of a satellite channel due to its inherent fairness and contentionless nature. Simulation results are presented with three different source traffic models, Poisson, self-similar (Pareto ON-OFF) and exponential ON-OFF. The results indicate that the ON-OFF nature of a traffic model has a more significant impact on Medium Access Control (MAC) protocol performance than the specific distribution of ON and OFF times.