Mobile-Host-Centric Transport Protocol For Wireless Local Area Networks

With the extensive application of wireless LANs, how to connect the wireless networks to Internet with a wide bandwidth has become more and more important and significant not only in science but also in economics. A high performance wireless internet transport protocol is the key to solve this problem. However, the Internet transport protocol was designed for fixed host and wired networks. It cannot adapt to wireless environment commendably and induce the decline of transport performance in wireless links.In this dissertation, we firstly proposed a new mobile-host-centric transport protocol (MCP). The protocol integrates the traditional sender centric transport protocol into the receiver centric transport protocol. The receiver centric control mechanism manages the data which is sent from fixed hosts to mobile hosts, and the sender centric control mechanism deals with the data which comes from mobile hosts to fixed hosts. In our MCP, most of the control mechanisms are implemented in mobile hosts. In this way, the mobile hosts are able to adjust the control scheme according to the state of wireless links, and the performance of the protocol can be improved efficiently.Secondly, we simulated the hand-off processes of mobile hosts and some basic function modules of MCP in various WLAN scenarios by the Network Simulator version 2 (NS2). The function modules mainly include the mobile-host-centric data transportation mechanism, the establishment and close of connections, flow control mechanism and congestion control mechanism, etc. And then, we recorded and analyzed the experimental results. The simulation results show that MCP has the same performance with TCP and also can be compatible with standard TCP.Finally, after thorough studies and precise experiments, we draw a conclusion that the MCP protocol is feasible in WLAN.