Abstract
With the proliferation of mobile and wireless computing devices, the demand for continuous network connectivity exits for various wired-and-wireless integrated networks. Since Transmission Control Protocol (TCP) is the standard network protocol for communication on the Interne, any wireless network with Internet service need to be compatible with TCP. TCP is tuned to perform well in traditional wired networks, where packet losses occur mostly because of congestion. However cellular wireless network suffers from significant losses due to high bit errors and mobile handoff. TCP responds to all losses by invoking congestion control and avoidance algorithms, resulting in degraded end-to-end performance. This paper presents an improved Explicit Loss Notification algorithm to distinguish between packet loss due to congestion and packet loss due to wireless errors and handoffs. Simulation results show that the proposed protocol significantly improves the performance of TCP over cellular wireless network in terms of throughput and congestion window dynamics.
Highlights
Transmission Control Protocol (TCP) is the most commonly used protocol at the transport layer of the network stack in the Internet
We cannot expect regular TCP to perform well in a mobile network. One reason for this is that wired links have low bit error rates (BER), as opposed to wireless links that suffer from high bit error rates and mobile handoff [1]
Simulation has been carried out to evaluate the performance of the proposed scheme i.e., Explicit Error and Handoff Notification Scheme under high BER condition of wireless link and during mobile handoff
Summary
It provides reliable data transfer for many popular Internet applications such as electronic mail, file transfer, web browsing and remote network access. If regular TCP is used on a mobile network, it will encounter packet losses that may be unrelated to congestion. These losses will trigger congestion control procedure at the fixed host. These procedures will result in significant reductions in throughput and unacceptable inter-reactive delays for active connection, severely degrading performance. If the losses are not due to congestion, TCP unnecessarily reduces throughput leading to poor performance
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