Improving recital of transport protocol in cognitive radio mobile ad hoc networks

2015 International Conference on Applied and Theoretical Computing and Communication Technology (iCATccT) Pub Date : 2015-10-01 DOI:10.1109/ICATCCT.2015.7456949

A. Selvan, K. Selvaradjou

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Abstract

Cognitive Radio (CR) networks has the potential to solve the scarcity problem of wireless resources were unlicensed users can opportunistically perform transmission without impacting the operations of licensed users. In CogMANET, the channel switching is inherently necessary when primary users appears on the channel. During the channel switching, the communication characteristics such as bottleneck bandwidth and RTT will change. Due to this change, TCP has to adaptively update its congestion window (cwnd) to make an efficient use of the available resources. TCP CRAHN which incorporate spectrum awareness by combining explicit feedback from intermediate nodes and destination was proposed. In this paper, TCP CRAHN is evaluated in cases where bottleneck bandwidth and RTT changes. Based on the results, TCP CoBA (Collabarative Bottleneck Analysis) is proposed to further improve the throughput. This protocol updates the cwnd based upon the available buffer space in the relay node upon channel switch. Comparison of TCP CRAHN and TCP CoBA throughput will be analyzed and implemented using the NS2 Simulator.

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认知无线电移动自组网中传输协议的改进

认知无线电(CR)网络具有解决无线资源稀缺问题的潜力，即未经许可的用户可以在不影响许可用户操作的情况下进行传输。在CogMANET中，当主用户出现在通道上时，通道切换本质上是必要的。在信道切换过程中，瓶颈带宽、RTT等通信特性会发生变化。由于这种变化，TCP必须自适应地更新其拥塞窗口(cwnd)，以有效地利用可用资源。提出了将中间节点和目的节点的显式反馈结合起来，实现频谱感知的TCP CRAHN。本文对瓶颈带宽和RTT变化情况下的TCP CRAHN进行了评估。在此基础上，提出了TCP协同瓶颈分析(CoBA)，进一步提高吞吐量。该协议根据通道切换时中继节点中的可用缓冲区空间更新cwnd。TCP CRAHN和TCP CoBA吞吐量的比较将使用NS2模拟器进行分析和实现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2015 International Conference on Applied and Theoretical Computing and Communication Technology (iCATccT)

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