认知Ad Hoc网络可靠路由技术

发布时间：2018-01-21 06:27

本文关键词： 认知Ad Hoc网络路由协议稳定性可靠性　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：认知无线电技术通过机会性地接入授权频段提高了频谱的利用率,缓解了频谱资源日益匮乏的问题,因此它在无线通信系统中应用广泛,如组网灵活且抗毁性好的Ad Hoc网络。应用认知技术的Ad Hoc网络是军事通信的必备技术之一,它可以通过对环境的感知实现战场通信的智能化。随着智能终端的普及和一些可重配置设备的迅速发展,认知Ad Hoc网络在民用和商用领域的应用也有了广泛前景。由于认知Ad Hoc网络的频谱动态接入特性,网络中节点的可用信道具有异构性、时变性和空间特性。这些特性使得认知Ad Hoc网络的路由面临新的挑战。在此背景下,本文针对认知Ad Hoc网络的特性,对其可靠路由问题展开研究,提出了一种适用于认知Ad Hoc网络的路由协议SR-DSR,增强了数据传输的稳定性和可靠性。本文首先介绍了认知Ad Hoc网络的研究背景以及相关的基本概念,明确了论文研究的对象,接着阐述了认知Ad Hoc网络路由研究面临的挑战和需要注意的问题,并进一步分析了当前认知无线网络路由的研究成果,介绍了可以应用到认知Ad Hoc网络中的几种抗干扰技术。在此基础之上,本文提出了多接口多信道环境下一种适用于认知Ad Hoc网络的可靠路由协议SR-DSR。该协议考虑认知Ad Hoc复杂的无线环境和网络环境,以稳定性为首要指标,联合考虑路由和信道选择的问题。SR-DSR根据路径上各个节点的可用信道情况对路径进行建模,计算度量路径的稳定性。信道选择方面SR-DSR综合考虑了信道的稳定性,递交率以及信道容量。在路由维护阶段,SR-DSR采取信道切换方式维护路径有效性,减小了外部干扰的影响。通过OPNET仿真平台实验结果可以看出,相比RASR协议以及传统的DSR协议,SR-DSR在稳定性和可靠性方面都更具有优势。最后,本文在SR-DSR基础上,加入了局部重路由和多径功能,进一步优化了路由协议。仿真显示局部重路由功能对于节点移动引起的路由失效有比较明显的修复效果,有效的减小了频繁完全重路由带来的开销和时延问题。多径路由为有递交率要求的业务提供了良好的解决方案。
[Abstract]:Cognitive radio technology improves the efficiency of spectrum through opportunistic access to the authorized frequency band and alleviates the problem of increasing scarcity of spectrum resources. So it is widely used in wireless communication systems. For example, Ad Hoc networks with flexible network and good survivability. Ad Hoc network with cognitive technology is one of the necessary technologies in military communication. With the popularization of intelligent terminals and the rapid development of some reconfigurable devices, it can realize the intelligence of battlefield communication through the perception of environment. Cognitive Ad Hoc networks are also widely used in civil and commercial applications. Due to the spectrum dynamic access characteristics of cognitive Ad Hoc networks, the available channels of nodes in the network are heterogeneous. Temporal variability and spatial characteristics make the routing of cognitive Ad Hoc networks face new challenges. In this context, this paper focuses on the characteristics of cognitive Ad Hoc networks. In this paper, the reliable routing problem is studied, and a routing protocol (SR-DSR) suitable for cognitive Ad Hoc networks is proposed. The stability and reliability of data transmission are enhanced. Firstly, the research background and related basic concepts of cognitive Ad Hoc network are introduced, and the object of this paper is defined. Then, the challenges and problems of cognitive Ad Hoc network routing research are described, and the current research results of cognitive wireless network routing are analyzed. This paper introduces several anti-jamming techniques that can be applied to cognitive Ad Hoc networks. This paper presents a reliable routing protocol SR-DSRs for cognitive Ad Hoc networks in multi-interface and multi-channel environments, which considers the complex wireless and network environments of cognitive Ad Hoc. Taking stability as the primary index, the problem of routing and channel selection is considered jointly. SR-DSR models the path according to the available channel conditions of each node on the path. In the aspect of channel selection, SR-DSR takes into account the channel stability, delivery rate and channel capacity. SR-DSR adopts channel switching method to maintain path validity, which reduces the influence of external interference. The experimental results of OPNET simulation platform show that. Compared with RASR protocol and traditional DSR protocol, SR-DSR has more advantages in stability and reliability. Finally, this paper is based on SR-DSR. Local rerouting and multipath functions are added to further optimize the routing protocol. Simulation results show that the local rerouting function can significantly repair the routing failure caused by node movement. Multipath routing can effectively reduce the overhead and delay caused by frequent complete rerouting. Multipath routing provides a good solution for traffic with delivery rate.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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