WTCP: A Reliable Transport Protocol for Wireless Wide-Area Networks |
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Authors: | Sinha Prasun Nandagopal Thyagarajan Venkitaraman Narayanan Sivakumar Raghupathy Bharghavan Vaduvur |
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Affiliation: | (1) Bell Laboratories, Lucent Technologies, New Jersey, USA;(2) Coordinated Science Laboratory, University of Illinois at Urbana-Champaign, USA;(3) Motorola Labs, Schaumburg, IL, USA;(4) Electrical and Computer Engineering, Georgia Institute of Technology, USA |
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Abstract: | Wireless wide-area networks (WWANs) are characterized by very low and variable bandwidths, very high and variable delays, significant non-congestion related losses, asymmetric uplink and downlink channels, and occasional blackouts. Additionally, the majority of the latency in a WWAN connection is incurred over the wireless link. Under such operating conditions, most contemporary wireless TCP algorithms do not perform very well. In this paper, we present WTCP, a reliable transport protocol that addresses rate control and reliability over commercial WWAN networks such as CDPD. WTCP is rate-based, uses only end-to-end mechanisms, performs rate control at the receiver, and uses inter-packet delays as the primary metric for rate control. We have implemented and evaluated WTCP over the CDPD network, and also simulated it in the ns-2 simulator. Our results indicate that WTCP can improve on the performance of comparable algorithms such as TCP-NewReno, TCP-Vegas, and Snoop-TCP by between 20% to 200% for typical operating conditions. |
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Keywords: | Wireless transport WTCP reliable wireless transmission |
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