Innovative TCP over Wireless Networks

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Basil Romi Jose
Nagaraj Vernekar


Transmission Control Protocol (TCP) was designed to perform well in wired networks where packet losses are mainly due to congestion. It has been observed that TCP performance degrades while operating over mobile wireless networks. In these networks packet losses occur also due to radio signal errors and disconnections in case of handover or loss of signal and not always due to congestion. TCP interprets packet loss on these networks as an indication of congestion and invokes congestion control mechanism as in a wired network. This reduces transmission rate drastically reducing throughput over these networks. In this paper we propose a simple TCP algorithm for wireless network environment. The proposed algorithm estimates the available bandwidth in the network using a forecasting method based on the rate of ACK’s received by the sender. Further based on this estimated bandwidth the congestion control parameters adapt dynamically to the network state and thus preventing drastic throughput degradation. The proposed algorithm will be then compared to the existing TCP New Reno and TCP Westwood..


Keywords: TCP, computer networks, congestion control


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