Research On TCP Technology In Wireless Internet

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. Two improved schemes are given in different network structure respectively. One is in wireless Internet in which the wireless link lies in the last hop of communication path. In this environment an integrated scheme is presented to solve the problem about higher bit error rates and disconnection. Then cross-layer problem occurring in the scheme is analyzed in detail and simulated. The other is in AD HOC networks. Because of the unique issues in the networks, including mobility-induced disconnection, network partition, high out-of-order delivery ratios and channel errors, the congestion control and the error recovery in the network is challenging. In this environment, 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 discussed. Then a particular transport layer protocol scheme based on the non-feedback mechanism is presented, with emphasis on the analysis and simulation of the key parameter. The result shows that the scheme can greatly improve the performance of TCP.