Performance Evaluation of Transmission Control Protocol over Adhoc Networks

Abstract

Ad Hoc Network is a multihop wireless network where all nodes cooperatively maintain network connectivity without a centralized infrastructure. The nodes participating in Ad Hoc Network operate both as hosts and as routers. The success of TCP in wired networks motivates its extension to wireless network. In Ad Hoc network the standard TCP faces server performance degradation over multihop networks given the noise nature of wireless media as well as unstable connectivity conditions in place. This research presents a study for a modified TCP protocol in order to enhance the behavior of the protocol in Ad-hoc wireless networks. Proposed two modification of the standard TCP by adjusting TCP's behavior during slow start and congestion avoidance phase’s .The throughput of the proposed protocols has increased over the throughput of the standard TCP protocol. Glomosim simulator was used, which is one of known simulators for Ad-hoc wireless networks.