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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: TCP NCE: A unified solution for non-congestion events to improve the performance of TCP over wireless networks | Sreekumari and Chung EURASIP Journal on Wireless Communications and Networking 2011 2011 23 EURASIP Journal op . http jwcn.eurasipjournals.eom content 2011 1 23 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access TCP NCE A unified solution for non-congestion events to improve the performance of TCP over wireless networks Prasanthi Sreekumari and Sang-Hwa Chung Abstract In this article we propose a unified solution called Transmission Control Protocol TCP for Non-Congestion Events TCP NCE to overcome the performance degradation of TCP due to non-congestion events over wireless networks. TCP NCE is capable to reduce the unnecessary reduction of congestion window size and retransmissions caused by non-congestion events such as random loss and packet reordering. TCP NCE consists of three schemes. Detection of non-congestion events NCE-Detection Differentiation of non-congestion events NCE-Differentiation and Reaction to non-congestion events NCE-Reaction . For NCE-Detection we compute the queue length of the bottleneck link using TCP timestamp and for NCE-Differentiation we utilize the flightsize information of the network with a dynamic delay threshold value. We introduce a new retransmission algorithm called Retransmission Delay for NCE-Reaction which guides the TCP sender to react to non-congestion events by properly triggering the congestion control mechanism. According to the extensive simulation results using qualnet network simulator TCP NCE acheives more than 70 throughput gain over TCP CERL and more than 95 throughput improvement as compared to TCP NewReno TCP PR RR TCP TCP Veno and TCP DOOR when the network coexisted with congestion and non-congestion events. Also we compared the accuracy and fairness of TCP NCE and the result shows significant improvement over existing algorithms in wireless networks. Keywords Wireless Networks TCP Congestion loss Non-congestion events Introduction Transmission Control Protocol TCP 1 is the .
