Improvement of Hybla Algorithm in Topological High Dynamic Satellite Networks

Abstract

Aimming at the dramatic change of round trip delay caused by high dynamic changes of satellite network’s communication path and sudden growth of congestion window when Hybla is used in long-delay network, an advanced algorithm named Hybla MM (melioration method) is proposed which calculates the propagation delay and weight it to mitigate the sudden increase of congestion window caused by path change. At the same time the algorithm determine the degree of network congestion by using the number of satellite cache packets in order to appropriately increase or decrease the window value in the congestion avoidance phase, thus resulting in that window grows less aggressive than the original. The results of simulation indicate that the Hybla MM obviously increase the stability of the congestion window growth.