Performance evaluation for TCP with traffic shaping over satellite communications

Abstract

interest in getting the TCP protocols to work more efficiently Abstract-Nowadays the demand for high-mobility remote over long delay paths. Still, efforts are underway to enable access broadband services like satellite networks is becoming better utilization of satellite links. more popular. Therefore arise of the network congestion seems to Performance of data communication is limited by the delay be the major problems for most of network operators. TCP inherent in geostationary systems and the probability of bit (Transmission Control Protocol) is being studied in order to errors found in any wireless system, including satellite systems. provide reliable data delivery over broadband satellite These limitations are becoming more important as new satellite communications. TCP per se provides various congestion offer much higher data transmission rates than those avoidance algorithms that may be used over the satellite link. systems However, TCP may somehow have to face with some difficulties available in the past. due to the satellite transmission and propagation delay. In such Satellite telecommunications can be affected by problems network where significant losses are occurred, it is difficult for caused by propagation delay. Owing to the large distance of TCP to respond to the required throughput but in other words it the geostationary satellite from the earth, the propagation time may degrade the performance. In this paper, traffic shaping is between two stations via satellite can reach approximately 275 investigated in order to ease the problem of congestion. To shape ms. Thus, a double-hop connection would require about 550 the traffic prior to the entrance of satellite communication system, ms in one way. However under ITU-T recommendation, the the paper makes use of NoQ, Network of Queue, and then the delay should be limited to 400 ms. Thus a TCP packet and the

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