| The behavior of various congestion control techniques are studied using a test-bed that simulates a Geo-Hop satellite channel. The varying parameters of BER, channel rate and the link delay of the satellite channel are simulated with SGLS (Space to Ground Link Simulator) test-bed. The performance of Pure Rate control, SCPS-Vegas-Congestion, SCPS-Vegas-Corruption, SCPS-VJ and TCP-Sack congestion control algorithms that are implemented in SCPS-TP and TCP protocols are compared and studied. For SCPS-VJ, SCPS-Vegas-Corruption and SCPS-Vegas-Congestion, the effect of rate control is also studied. From the comprehensive experimentation and analysis of all the experimented congestion control techniques, at BER 10-5 some interesting observations are concluded. Pure Rate control performs the best of all the considered congestion control techniques. TCP-Sack and SCPS-VJ performs better than SCPS-Vegas (both corruption and congestion) and SCPS-Vegas-Corruption performs far better than SCPS-Vegas-Congestion. At high BERs, congestion control with rate control is better than that of without rate control for all the tested congestion control techniques. |
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