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Enhancement of HSWA-TCP Congestion Avoidance Scheme for High Speed Satellite Communication Network


Prof. Riddhi P. Pandya , CHARUSAT - Charotar University of Science & Technology; Prof. Ayesha S. Shaikh, CHARUSAT - Charotar University of Science & Technology


HSWA-TCP, Satellite Communication, BER


The Transmission Control Protocol (TCP) is the mostly used protocol for data transmission over terrestrial-wire line networks. However, TCP's congestion control algorithm wasn't created to match the special characteristics (long delay and high Bit Error Rate) of satellite links, resulting in a drastically performance degradation. For high speed satellite communication networks to match its characteristics such as long delay and high Bit Error Rate several protocols are designed. SCPS-TP is one of the protocols designed for satellite networks but its throughput is low in high speed satellite environment. SCPS-TP congestion avoidance algorithm is modified to adapt the characteristics of high speed satellite communication network which is called the HSWA-TCP. HSWA-TCP is simulated and results show that performance of HSWA-TCP decays very sharply in high BER. To overcome these limitations Enhanced HSWA-TCP protocol is developed which depends not only on RTT and BER but also on bandwidth estimation. Enhanced HSWA-TCP continuously estimate bandwidth utilized by the sender, and based on that adjusts the cwnd rather than just at the time of packet loss. Simulation results show that, Enhanced HSWA-TCP throughput is improved and remain constant even in high BER and on average, throughput of Enhanced HSWA-TCP is 56% improved compare to HSWA-TCP.

Other Details

Paper ID: IJSRDV2I9430
Published in: Volume : 2, Issue : 9
Publication Date: 01/12/2014
Page(s): 775-779

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