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Implementation of TCP Congestion Control mechanism for Wireless Networks using TCP Reserved Field and Signal to Noise Ratio (SNR)

D. Hema Latha, T. Venkat Narayana Rao, D. Rama Krishna Reddy


TCP is the most popular and widely used network transmission protocol. All most 90% of the Internet connections make use of TCP for communication. TCP is reliable for wired networks and it considers all packet timeouts in wired networks as due to network congestion and not because of bit errors. However, TCP suffers from performance degradation over error-prone wireless links, as it has no technique to distinguish error deficits from congestion deficits, with networking becoming more divergent, with wired and wireless topologies. It considers all packet deficits are due to congestion and subsequently reduces the packet burst transmission, at the same time decreasing the network throughput. In this paper a new TCP congestion control mechanism is proposed that is suitable and applicable for wireless and also for wired networks and is capable of distinguishing congestion deficits from error deficits. The proposed technique uses the reserved field of the TCP header to indicate whether the connection established is over a wired or a wireless link.

Further, the proposed technique influences the usage of Signal to Noise Ratio (SNR) to discover the reliability of the link and determine whether to decrease the packet burst or retransmit the timed-out packet. Investigations performed, revealed that the proposed mechanism confirmed to function amend in circumstances where timeouts were due to error and not due to congestion. Further, the future work can be enhanced upon the proposed mechanism so that it can leverage Cyclic Redundancy Check(CRC) and Header Error Check(HEC) errors so that it can be properly determined the reason for initializing transmission timeouts in wireless networks.



TCP Congestion, Wireless Network, Reserved Field, SNR

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