Layered Multicast Congestion Control Algorithm for GEO Satellite Networks
Liu Gong · 2007
A new layered multicast congestion control algorithm SLMCC is proposed for GEO satellite networks in this paper, aiming at the network characteristics of high BER and long propagation delays. In SLMCC, the queue information at system bottlenecks is used in adjusting the multicast layers in time, which eliminates the influence of the GEO long propagation delays. The average rate of multicast flows and of TCP flows passing through the bottlenecks are measured and compared for TCP-friendliness, and a novel rate-based layer priority modification policy is designed for bandwidth fairness among heterogeneous multicast sessions. In order to avoid the unnecessary decrease of multicast rate along with the bad-performance TCP flows in high BER satellite channels, a comparison coefficient α is adopted in SLMCC. Simulation results show that SLMCC significantly improves the performance of layered multicast in GEO satellite environments.