The impact of multihop wireless channel on TCP throughput and loss

摘要: This paper studies TCP performance over multihop wireless networks that use the IEEE 802.11 protocol as access method. Our analysis and simulations show that, given a specific network topology flow patterns, there exists window size W*, at which achieves best throughput via improved spatial channel reuse. However, does not operate around typically grows its average much larger; this leads to decreased increased packet loss. The reduction can be explained by loss behavior. results overload is mainly signified link contention in networks. As long buffer each node reasonably large (say, larger than 10 packets), overflow-induced rare drops due link-layer dominate. Link-layer offer first sign for overload. We further links collectively exhibit graceful drop behavior: offered load increases, probability also but saturates eventually. In general, insufficient stabilize W*. Consequently, suffers from reduced propose two techniques, RED adaptive pacing, through we are able improve 5% 30% various simulated topologies. Some simulation validated real hardware experiments.