TaoZheng/Pathload-for-ns2

PathChirp is a well-known tool to estimate available bandwidth based on an approach of self-induced congestion, which exponentially increases the rate of probing packets in each packet train. But the inappropriate gaps of probing rates often result in a large deviation of estimated available bandwidth. In order to solve this problem, we propose HybChirp, an active probing tool which uses linearly spaced probing packets (lin- chirps) and exponentially spaced probing packets (exp-chirps) in combination. HybChirp improves PathChirp by adopting the hybrid of lin-chirps and exp-chirps, while inherits the advantages of PathChirp such as the short convergence time and low overhead. The NS-2 simulation results have shown that HybChirp outperforms PathChirp and Pathload in terms of accuracy, overhead, convergence time and adaptivity.

Tcl