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TCP proxies have been introduced as a method to improve throughput and reduce congestion in mobile ad hoc networks. Proxies split the path into several shorter paths which have higher throughput due to reduced packet loss and round trip time. As a side effect, congestion is reduced because fewer link layer retransmissions occur. In current protocols, proxies are assigned at the start of the transfer and must be used for the duration. Due to mobility and congestion change, pinned proxies can actually reduce throughput.In this thesis, we present a second version of the DTCP protocol which includes the ability to switch proxies in the middle of a transfer. We demonstrate in the Network Simulator version 2 that the new protocol performs better than other related protocols in simulated mobile ad hoc networks with varying levels of mobility and congestion. |
