Throughput and Compatibility Analysis of TCP Variants in Heterogeneous Environment

Throughput and Compatibility Analysis of TCP Variants in Heterogeneous Environment

Sukant Kishoro Bisoy (SOA University, India), Prasant Kumar Pattnaik (KIIT Univeristy, India) and Narendra Kumar Kamila (C. V. Raman College of Engineering, India)
DOI: 10.4018/978-1-5225-0501-3.ch011
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Abstract

When TCP Reno and TCP Vegas connections share a link, TCP Reno generally steals more bandwidth and dominates TCP Vegas because of its aggressive nature. This is the major reason why TCP Vegas has not gained much popularity and deployment in the Internet despite its excellent standalone performance. This work systematically examines compatibility between Reno and Vegas in wired as well as in wireless networks. Popular Active Queue Management (AQM) technique named as Random Early Detection (RED) to minimize the incompatibility between Reno and Vegas in wired network. For wireless network two ad hoc routing protocols such as Ad Hoc On-Demand Distance Vector (AODV) and Destination-Sequenced Distance Vector (DSDV) are considered. Simulation results show that the incompatibility between Reno and Vegas in wired network is minimized using popular RED techniques. But in wireless ad hoc network environment Reno's aggressive behavior gets deteriorated while sharing with Vegas. Moreover, Reno and Vegas are more compatible in wireless network than wired network when both coexist in same time.
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Problem Statement

In recent studies it is seen that TCP Vegas out performs TCP Reno in both wired as well as wireless networks. It is also observed that when both TCP Vegas and TCP Reno coexist (heterogeneous environment) on the same wired links; Reno dominates because of its more aggressive behavior. And TCP Reno generally steals more bandwidth than TCP Vegas. It is believed that this is a major reason why TCP Vegas has not gained the expected popularity and deployment in the Internet despite its excellent standalone performance. In wired network the incompatibility between Reno and Vegas is reduced using Random Early Detection (RED) (Floyd, 1993) techniques. According to the author knowledge, compatibility between TCP Reno and TCP Vegas in wireless environment is not studied considering many issues. So we have attempted to analyze the fairness, throughput of a network and compatibility between them when co-exist in wired and wireless medium.

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