DBLAR:A DISTANCE-BASED LOCATION-AIDED ROUTING FOR MANET

In location-aided routing of Mobile Ad hoc NETworks(MANET),nodes mobility and the inaccuracy of location information may result in constant flooding,which will reduce the network performance.In this paper,a Distance-Based Location-Aided Routing(DBLAR) for MANET has been proposed.By tracing the location information of destination nodes and referring to distance change between nodes to adjust route discovery dynamically,the proposed routing algorithm can avoid flooding in the whole networks.Besides,Distance Update Threshold(DUT) is set up to reach the balance between real-time ability and update overhead of location information of nodes,meanwhile,the detection of relative distance vector can achieve the goal of adjusting forwarding condition.Simulation results reveal that DBLAR performs better than LAR1 in terms of packet successful delivery ratio,average end-to-end delay and routing-load,and the set of DUT and relative distance vector has a significant impact on this algorithm.

Route maintenance of on-demand routing protocol in mobile ad hoc networks

In mobile ad hoc networks(MANETs),if a muhihop route breaks,route maintenance is typicallyperformed to establish a new route which causes high control overhead and long packet delay.To decreasethe time of recovery and the overhead of maintenance,a new route maintenance mechanism in which themaintenance is confined to the vicinity of the broken link is proposed.This mechanism patches brokenroute through some other nodes in which only nodes near the broken link(s)may need to be substitutedand the rest of nodes can be retained on the route.The broken link can be repaired without consideringits relative position in the whole path,so the ability of dealing with link failure is improved obviously.Simulation results show that the proposed strategy improves network performance significantly,such as inmerits of control overhead and packet delay.

A reliable routing algorithm based on fuzzy Petri net in mobile ad hoc networks

A novel reliable routing algorithm in mobile ad hoc networks using fuzzy Petri net with its reasoning mechanism was proposed to increase the reliability during the routing selection. The algorithm allows the structured representation of network topology, which has a fuzzy reasoning mechanism for finding the routing sprouting tree from the source node to the destination node in the mobile ad hoc environment. Finally, by comparing the degree of reliability in the routing sprouting tree, the most reliable route can be computed. The algorithm not only offers the local reliability between each neighboring node, but also provides global reliability for the whole selected route. The algorithm can be applied to most existing on-demand routing protocols, and the simulation results show that the routingreliability is increased by more than 80% when applying the proposed algorithm to the ad hoc on demand distancevector routing protocol.

QoS Aware Routing Protocol to Improve Packet Transmission in Shadow-Fading Environment for Mobile Ad Hoc Networks

In Shadow-Fading model, it is difficult to achieve higher Packet Delivery Ratio (PDR) due to the effects of large scale fading. The main goal of this paper is to improve the PDR in Shadow-Fading environment. To achieve this objective a protocol has been proposed that discovers backup routes for active sessions. These backup routes salvage the packets of active session in case of active route failure. It is found by research that proactively maintaining backup routes for ac-tive sessions can noticeably improve the PDR in Shadow-Fading environment. This protocol has been implemented with a mechanism of having backup routes and simulations have been conducted by using both node disjoint paths and link disjoint paths. Comparisons have been made between new protocol as well as AODV protocol. Simulation has been carried out using Network Simulator 2 (NS2) and the results show that the proposed QoSAR protocol exhibits higher PDR than AODV protocol in Shadow-fading environment.

Trust-based Intelligent Scheme for Mitigating Black Hole Attacks in IoT

Internet of Things(IoT)networks are characterized by a multitude of wireless,interconnected devices that can dynamically join or exit the network without centralized administration or fixed infrastructure for routing.While multipath routing in IoT networks can improve data transmission reliability and load balancing by establishing multiple paths between source and destination nodes,these networks are susceptible to security threats due to their wireless nature.Traditional security solutions developed for conventional networks are often ill-suited to the unique challenges posed by IoT environments.In response to these challenges,this paper proposes the integration of the Ad hoc On-demand Multipath Distance Vector(AOMDV)routing protocol with a trust model to enhance network performance.Key findings from this research demonstrate the successful fusion of AOMDV with a trust model,resulting in tangible improvements in network performance.The assessment of trustworthiness bolsters both security and routing capabilities in IoT networks.The trust model plays a crucial role in mitigating black hole attacks in IoT networks by evaluating the trustworthiness of nodes and helping in the identification and avoidance of malicious nodes that may act as black holes.Simulation results validate the efficacy of the proposed trust-based routing mechanism in achieving its objectives.Trust plays a pivotal role in decision-making and in the creation of secure distribution systems.By assessing the trustworthiness of nodes,both network security and routing efficiency can be enhanced.The effectiveness of the proposed trust-based routing mechanism is scrutinized through simulations,offering insights into its potential advantages in terms of improved network security and routing performance in the context of the IoT.

AODV和AOMDV路由协议性能分析与比较

移动无线自组网(MANET)作为一种典型的自组织网络,其路由协议一直是研究的重点。介绍了无线自组网按需平面距离矢量路由(AODV)协议和无线自组网按需多路径距离矢量路由(AOMDV)协议的特点,在NS2模拟软件中使用多种测试场景和不同的介质访问控制(MAC)层协议对这两种路由协议的性能进行了测试和分析。实验结果表明,AOMDV协议在平均延时和路由发现频率上优于AODV协议,在分组投递率和归一化路由开销方面的性能低于AODV协议。

无线Ad Hoc网络中AODV路由算法的研究与改进

无线Ad Hoc网络是一个多跳的、临时的、对等的自治系统,它由一组带有无线收发信装置的移动节点组成。由于在军事通信、紧急救援、传感器网络等通信场合的广泛应用,无线Ad Hoc网络成为当前研究的热点之一。针对无线AdHoc网络中AODV路由协议算法在网络拓扑结构改变后出现的性能缺陷,提出了一种改进后的AODV路由协议M_EAODV,通过设置多条备份路由来减少链路修复。仿真结果表明,改进后的AODV在分组传送成功率、平均端到端时延、路由开销等性能方面都得到了有效改善,能够在链路中断后迅速启用备份路由,更适应于拓扑结构变化快的网络环境。

移动Ad Hoc网络AODV路由协议的改进

针对移动Ad Hoc网络AODV路由协议的路由维护的缺点,提出了AODV-BR路由协议,即具有备份路由的AODV路由协议。新协议通过为网络中的连接链路增加一条备份路由提高了AODV路由维护的性能。仿真实验表明AODV-BR有效减少了网络中链路中断的数量,降低了丢包率。

移动Ad hoc网络路由协议的安全性分析与对策

移动Ad hoc网络是一种自组织、多跳的无线网络,由于其独特性能使移动Adhoc网络面临着比现有网络具有更大的安全挑战,其中路由安全对该网络的安全性起着关键性的作用。在介绍移动Ad hoc网络主要路由协议及其特点的基础上,笔者深入研究了移动Ad hoc网络路由协议中存在的黑洞、拒绝服务等安全漏洞;详细分析了几种主要的Ad hoc路由协议的安全性增强方案;根据不同路由协议的特点,分别提出了利用单向散列链改进距离矢量路由协议安全性的两种方案;分析了一种用于改善源路由协议安全性的方案的可行性。最后,指出了移动Ad hoc网络路由协议安全性问题的进一步改进和研究方向。

基于OPNET的Ad Hoc网络AODV路由协议仿真

为更好地解决多种Ad Hoc路由协议的有效性差、控制开销大等问题,利用OPNET仿真工具对AODV(Ad Hoc On-Demand Distance Vector)路由协议的性能进行仿真,阐述了利用OPNET仿真平台进行Ad Hoc路由协议仿真的一般方法和过程。网络传输时延、网络吞吐量和网络负载等关键参数的仿真结果表明,AODV路由协议的性能比较稳定,即按需路由协议比主动路由协议更适合Ad Hoc网络,为研究Ad Hoc网络提供了参考。

MAODV协议的QoS延伸

研讨了AdHoc网络中具有QoS约束的多播路由问题和网络模型,提出了一种基于延伸MAODV(Multicast AdHoc On-demand Distance Vector)多播路由协议的延时、带宽和包丢失率等度量的QoS多播路由协议。仿真实验显示该协议较好地改进了端到端传输延时、带宽利用率和传输性能,为AdHoc网络QoS多播路由提供了一种新的有效途径。

基于能量和链路状态的AODV路由请求转发机制研究

按需距离矢量路由算法(AODV)为移动无线自组织网络(Manet)提供了高效的、扩展性能良好的路由解决方案。然而AODV在选择路径时仅以最短路径和最快响应作为度量准则,并未考虑节点能量、负载以及链路状态等因素,导致得到的路径并非为最优且节点能量消耗不均衡,降低了网络生存时间。在传统AODV算法基础上,提出了一个改进的路由算法,该算法在路由选择时充分考虑了节点的能量、负载以及节点间的链路状态,可以有效提高网络性能并延长网络生存时间。在NS2平台上的仿真实验结果也显示,所提算法在路由负荷、时延、分组传递率以及节能方面均优于传统AODV算法。

AODV和AOMDV路由协议性能仿真与分析

使用NS-2仿真软件,选取分组投递率、端到端的平均时延、归一化的路由开销和路由发现频率4个指标对AODV和AOMDV路由协议进行了性能仿真,通过改变业务源连接数目、节点的暂停时间分析比较这些参数对2个协议性能的影响,研究结果表明了AOMDV多径协议的优越性。并提出了对AOMDV协议的改进。

一种适用于WiFi Mesh网络的AODV改进路由协议

提出了一种利用wireless fidelity(WiFi)Mesh网络中多传输范围、多速率特性的路由算法.这种算法引进了跨层设计思想,利用IEEE 802.11的自适应速率切换机制,节点建立路由时以物理层的数据传输速率作为判据,速率相同时则选择跳数少的路径.提出了通过调整发射功率实现在不同速率下选择路径的方法.利用这种算法改进了Ad hoc按需距离矢量(AODV)路由协议,提出WiFi-AODV路由算法.仿真分析表明,该路由算法能建立一条数据速率高、传输时延小、系统吞吐量大的路由.

多径路由协议AOMDV的改进与性能分析

移动无线自组网是一种移动多跳无线网络,有效的路由算法是关键。由于移动自组网的移动性,会使得无线自组网按需多径距离矢量路由(AOMDV)协议的活动路由不再是最短路径。针对此不足,提出了改进方法:构建两跳路由,然后利用两跳路由信息对活动路由进行动态优化,使路径更短。NS-2仿真结果表明,改进的AOMDV协议在路由发起频率、端到端平均时延、归一化路由开销和数据分组投递率等方面的性能均比AOMDV效果好。

一种新的跨层功率控制无线传感器网络路由协议

无线传感器网络中通信终端的能量非常有限,但在许多应用场景下,节点的能量消耗较大,因此采用有效的功率控制策略非常重要。利用信道增益的对称性,在AODV协议的基础上提出了一种不依赖于地理位置信息的跨层功率控制路由协议PBAODV(Power aware Based AODV),分析与实验表明该协议在不影响其他网络性能指标的前提下,有效的降低了系统整体能耗。

一种用于单向链路网络的路由算法

价格低廉的卫星只收接收器能接收卫星发送的高带宽的数据，但是它不能向卫星发送数据．这样，卫星到这种接收器的链路就是单向的链路．现有的路由协议要求每条链路都是双向链路，不能处理单向链路的问题．一些学者利用“隧道”方法来解决这个问题．但是，这种方法需要事先知道一条从接收者到卫星上行链路发送站的“隧道”，因而不能适应网络拓扑结构的动态变化．文章提出了一种动态路由算法，它能用于具有单向链路的网络。

基于负载均衡与时延约束的AODV协议

为了降低无线网格网(Wireless mesh network,WMN)中节点间的端到端传输时延,该文提出了一种改进的基于负载均衡与时延约束的自组织网络按需距离矢量路由协议(Enhancedrouting protocol on ad hoc on-demand distance vector(AODV)with load balance and delay restriction,BD_AODV)。BD_AODV要求源节点在进行路由请求时,包含对传输时延的要求和节点的负载信息,选择满足传输时延要求的节点转发路由请求至目的节点,目的节点搜集并将每条链路的平均负载反馈给源节点,使其能够据此选择合适的传输路由。网络模拟软件仿真实验表明,BD_AODV有助于保持网络的负载均衡,缩短端到端的传输时延,减少数据包丢失,提高无线网格网的服务质量。

一种改进的无线自组网QoS路由协议——EQAODV

提出了一种新的QoS路由保障协议,该协议是在按需距离矢量路由(AODV)协议的基础上引入QoS保障机制扩展而成。它将带宽作为QoS路由保障的先决条件,延时和分组丢失率作为优化的目标,更好地保障了无线自组网的服务质量。仿真结果表明,该协议能较大地改善网络的性能,在QoS保障上优于AODV协议。

移动Ad Hoc网络路由协议的性能分析与比较

移动Ad Hoc网络是由一组无线移动主机组成的一个没有任何建立好的基础设施或集中管理设备的临时网络。网络拓扑易变、带宽、能源有限是移动Ad Hoc网络的主要特点。分析表驱动路由协议DSDV和按需路由协议DSR、AODV和TO- RA,并利用NS2软件进行了仿真实验,通过改变节点的暂停时间和移动速度这两个参数来比较这两个参数对这四种协议性能的影响。仿真结果表明,按需路由协议在分组投递率、端到端的平均时延、路由开销方面都表现出较好的性能。但同时结合表驱动路由协议的特点,为进一步在综合考虑以上两类路由协议特点的基础上研究新的路由协议提供很好的参考。