Nayeema Islam and Mohammed Nasir Uddin
Department of Computer Science and Engineering, Jagannath University, Dhaka,
Bangladesh
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.
KEYWORDS
TCP, Cellular Wireless Network, Handoff, High Bit Error, Explicit Loss and Handoff Notification
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