Abstract
Objectives: To design an adaptive window adjustment mechanism for Transmission Control Protocol (TCP) in Mobile Ad hoc NETworks (MANET). Methods/Statistical Analysis: A congestion control using Fuzzy based adaptive TCP window adjustment technique is proposed. In this technique, the bottleneck bandwidth and total round-trip delay metrics are considered as input for the fuzzy logic decision model. The corresponding congestion window adjustment size is returned as the output. The proposed Fuzzy TCP-WA technique is simulated using NS2 and compared with FL-TCP. The proposed TCP-WA technique can be applied in interactive real-time applications like live chat session and File Transfer Protocol (FTP). Simulation results using NS2 suggest that the proposed congestion control technique Findings: educes the packet drop and delay and increases the throughput. Keywords: Bandwidth and Delay Product, Bottleneck Bandwidth, Congestion Control, Congestion Window, Fuzzy Logic, Roundtrip Delay, Transmission Control Protocol (TCP)
Highlights
The major issues of Mobile Ad hoc Networks (MANET) are frequent mobility, network partitions, collisions, high error rate, limited bandwidth and power
As the bandwidth and delay product has severe impact on the congestion, the congestion windows has to be adjusted based on this product
Since Fuzzy Transmission Control Protocol (TCP)-WA considers the RTT delay for window adjustment, it has 46% reduced delay when compared to FL-TCP
Summary
The major issues of Mobile Ad hoc Networks (MANET) are frequent mobility, network partitions, collisions, high error rate, limited bandwidth and power. Various researches have been conducted to analyze the reasons for the poor performance of TCP in MANETs. The main reasons responsible for this poor performance include lossy nature of wireless channel, inefficient MAC protocols, control packet overhead of routing protocols etc[1]. Congestion control has been an important issue for wireless networks in recent days. Congestion normally occurs in a bottleneck link along the path from source to destination nodes. Congestion control schemes, that operate on various types of traffic should satisfy various Quality of Service (QoS) constraints[3]. TCP based congestion control mechanism adjusts the data rate to avoid congestion
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