认知无线Ad Hoc网络稳定路由算法的研究与实现

发布时间：2018-01-09 05:23

本文关键词：认知无线Ad Hoc网络稳定路由算法的研究与实现　出处：《中南林业科技大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着无线电技术、通信网络的迅猛发展以及无线业务带宽需求量的增加,网络中的频谱资源变得越来越紧张。认知无线电(Cognitive Radio, CR)技术能够有效缓解网络中频谱资源紧张的问题。认知无线Ad Hoc网络(Cognitive Radio Ad Hoc Networks, CRAHNs)是采用CR技术的Ad Hoc网络。Ad Hoc网络中已有的路由算法无法直接应用于CRAHNs。近年来,针对CRAHNs中的路由问题已经取得了一些研究成果,但是以链路稳定性为目标的路由问题还有待深入研究,因为CRAHNs中的次用户(Secondary Users, SUs)节点机会式的使用授权网络中主用户(Primary Users, PUs)未使用的频谱,以及SUs节点具有移动性,导致的链路不稳定性并严重影响到CRAHNs的网络性能。本文以稳定性为目标对CRAHNs中路由问题展开研究,主要研究包括：1)首先对CRAHNs中已有的路由指标和算法进行了全面系统的分析研究。CRAHNs中已有的路由指标可以分为6类,主要包括：基于吞吐量、基于延迟、基于位置、基于能量、基于链路稳定性以及混合多种路由指标。2)提出了一种基于移动预测的稳定路由判据指标CMID,CMID主要包含4个因素：①信道自身的异构性,包括信道带宽、信道稳定度、以及信道使用率。②节点的移动性。③链路的干扰。④节点之间的距离。3)在提出稳定路由判据指标CMID的基础之上,提出了一种CRAHNs中满足QoS约束的稳定路由与频谱分配算法MRS2Q,基本思想是：在一个可变化的扇形区域内基于路由判据指标CMID选择下一跳节点,为了控制路由路径的长度,初始化扇形区域圆心角为90度,如果扇形区域内找不到满足需要的下一跳节点,则增加扇形区域的圆心角,直到能扇形区域内找下一跳节点为止。4)最后利用仿真平台NS2对提出的算法进行仿真,以节点的移动速度和主用户节点数为参数,分析比较了网络的平均吞吐量和平均延迟。通过仿真发现,我们提出的稳定路由判据指标CMID和稳定路由与频谱分配算法MRS2Q能够构造稳定的路由路径,相比较其他路由算法能获得较好的网络性能。
[Abstract]:With the rapid development of radio technology, the rapid development of communication network and the increase of bandwidth demand of wireless services, the spectrum resources in the network become more and more tight. Cognitive Radio Cognitive Radio. Cr) technology can effectively alleviate the problem of spectrum resource shortage in networks. Cognitive Radio Ad Hoc Networks in cognitive wireless Ad Hoc networks. CRAHNs is an Ad Hoc network using CR technology. The existing routing algorithms in Ad Hoc networks can not be directly applied to CRAHNs in recent years. Some research achievements have been made on the routing problem in CRAHNs, but the routing problem aiming at link stability still needs to be deeply studied. Because the secondary users (sus) nodes in the CRAHNs are opportunistic to use the primary Users in the authorized network. The unused spectrum, and the mobility of the SUs node. This paper studies the routing problem in CRAHNs with the aim of stability. The main research includes: 1) first of all, the existing routing indexes and algorithms in CRAHNs are analyzed comprehensively and systematically. The existing routing indexes in CRAHNs can be divided into six categories. Mainly include: based on throughput, based on delay, based on location, based on energy. Based on link stability and mixed routing index. 2) a stable routing criterion based on mobile prediction (CMIDCMID) is proposed, which consists of four factors, namely, heterogeneity of the channel itself. Including channel bandwidth, channel stability, and channel utilization. 2 node mobility. 3. 3. The distance between the interference 4 nodes of the link. 3) based on the proposed stability routing criterion CMID. A stable routing and spectrum allocation algorithm, MRS2Q, which satisfies QoS constraints in CRAHNs is proposed. The basic idea is to select the next hop node based on the routing criterion CMID in a variable sector region. In order to control the length of the routing path, the center angle of the sector region is initialized to 90 degrees. If the next hop node can not be found in the sector region, the center angle of the sector region is increased. Finally, the proposed algorithm is simulated using the simulation platform NS2, taking the moving speed of the node and the number of primary user nodes as parameters. The average throughput and average delay of the network are analyzed and compared. The stable routing criterion (CMID) and the stable routing and spectrum allocation algorithm (MRS2Q) proposed by us can construct stable routing paths, which can obtain better network performance compared with other routing algorithms.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN925

【相似文献】