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Title:	An eficient slow-start and congestion avoidance mechanisms for transmission control protocol over long term evolution advanced network
Authors:	Ghassan Akram Abed (P53024)
Supervisor:	Mahamod Ismail, Prof. Dr.
Keywords:	TCP/IP (Computer network protocol) Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia
Issue Date:	15-Jan-2013
Description:	Transmission Control Protocol (TCP) is the dominant protocol in modern communication networks, within which the issues of reliability, data flow and congestion control must be handled efficiently. TCP provides a communication service at an intermediate level between an application program and the Internet Protocol (IP). With the evolution of Third Generation (3G) toward 4G wireless network, such as Long Term Evolution-Advanced (LTE-Advanced) standard, the use of TCP becoming more important for reliable end-to-end data delivery. As TCP was initially designed for wired networks, the LTE-Advanced network performance will degrade due to signal impairment and heavily congested links. Consequently, the traditional TCP versions such as Tahoe, Reno, Newreno, Sack, Fack, and Vegas, could not fulfil LTE-Advanced requirements to support huge number of user equipment's that need wider channel bandwidth, low latency, and the enormous data stream transferred over this network. The objective of this thesis is to develop an efficient congestion control technique during slow-start and congestion avoidance phases for new TCP agent over LTE-Advanced network. Instead of using exponential increments as in traditional TCP variants, the proposed slow-start algorithm duplicates the congestion window (cwnd) and then approximates cwnd size using a quadratic interpolation approach until reaching the slow-start threshold (ssthresh). An improved Additive Increase Multiple Decrease (AIMD) algorithm control cwnd increment to avoid the congestion by deriving a new relationship between AIMD parameters. Moreover, multiple TCP technique achieves virtual multi-flows estimated dynamically according to network congestion conditions over the same connection. The proposed congestion control mechanism is integrated within a new high speed TCP agent called TCP Rapid using Network Simulator 2 (NS-2) and is verified over a traffic model of an LTE-Advanced network. Performance comparison in term of throughput, packet loss, queue size and goodput, as well and the behaviour of the congestion window proved that the proposed mechanism outperform the standard TCP variants. The throughput of TCP Rapid increased by 3 folds compared to Tahoe and doubled with Newreno while the goodput is 45% to 57% better than Reno and maintaining minimum packet loss and adequate queue size. Finally, it can be concluded that the proposed TCP is substantially efficient for wide-bandwidth lowlatency networks such as LTE-Advanced, thus achieving higher throughput and a lower packet loss level.,Ph.D.
Pages:	212
Call Number:	TK5105.585A244 2013 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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