Study On TCP In Ad Hoc Network

Traditional TCP widely used in the Internet, which was designed for the wired network, has achieved a great of successes. While it misinterprets the packets' corruption over the wireless links as congestion in network, so the traditional TCP suffers from significant throughout degradation in the wireless mobile environment. This paper focuses on the performance of TCP in an Ad hoc network. Due to the unique issues in the network, including mobility-induced disconnection, network partition, high channel errors, the congestion control and the error recovery in the network is challenging. Based on the detail of traditional TCP, the reason of the low throughput and impaired performance of TCP in wireless networks is given, then some solutions are proposed based on the transmission control principle. Moreover the impactions of protocols in the lower layers including MAC and routing protocol on TCP in Ad hoc network are discussed in detail, and the interaction between TCP and MAC layer protocols, the affection of route protocols on the performance of TCP and the particular congestion control and error recovery mechanism are first investigated. In this environment an integrated wireless TCP, called IWTCP, is presented to solve the problem about higher bit error rates and disconnection, which emphasizes on the analysis and simulation, the results show that the scheme can greatly improve the performance of TCP, and the realization of IWTCP is given at last.