LINK PERDURABILITY BASED ROUTING FOR MOBILE AD HOC NETWORKS

Ad Hoc networks are prone to link failures due to mobility. In this letter, a link perdurability based routing scheme is proposed to try dealing with this problem. This scheme uses signal strength measurements to estimate the route life time and hence chooses a stable route, and is implemented in two typical ad hoc routing protocols to evaluate its performance.The simulation results have shown that this scheme can improve these protocols‘ packet delivery ratio in cases where there are frequent link failures.     

基于地理定位信息的移动自组网路由协议综述

移动自组网是自组网技术的重要应用领域,其关键技术在于路由协议的设计和选取.分析了移动自组网路由协议的基本设计原则和分类,总结了基于地理定位信息的移动自组网路由协议的发展现状和特点,指明了目前研究的热点方向.最后,对移动自组网的发展方向进行了展望.     

移动Ad Hoc网络中的ZRP

主要介绍了区域路由协议(ZRP),对Ad Hoc网络中的路由选择问题和ZRP提出的原因进行了讨论。详细描述了ZRP的结构和路由选择的过程,并且给出了一个实例。最后还介绍了询问控制机制,对ZRP的性能做一个总体的回顾和展望。     

Ad Hoc网络中一种基于QoS的分布式多播路由算法

通过分析Ad Hoe网络的特点及基于QoS的多播路由问题，提出了一种新的分布式多播路由算法。实验和分析的结果表明，文中构造的路由方案成功地解决了Ad Hoe网中基于QoS的多播路由问题。当Ad Hoe网络的拓扑结构改变不太快时，本文提出的路由方案不仅满足了实时业务对网络带宽和端到端延时的要求，优化了路由树的代价，而且有效地控制了算法的复杂性并可适用于大规模的网络中。     

移动Ad Hoc网络按需路由协议的研究

移动Ad Hoc网络是一种具有高度动态拓扑结构、节点任意移动的自组织网络。路由协议能够为数据分组的传输指定路径,是移动节点相互通信的基础,对移动Ad Hoc网络的性能起着至关重要的作用。文中介绍移动Ad Hoc网络及其路由协议的基本概念和特殊性,研究几种典型按需路由协议的原理,对协议进行综合比较,简要讨论了各自的优缺点。     

稀疏移动自组网中路由算法的改进

Epidemic路由协议是第一个针对稀疏移动自组网提出的路由协议,它利用节点移动,相互之间不断＂接触＂,使数据从源节点开始像病毒那样传播到网络中的其它节点。针对Epidemic协议中无效通信过程与到达目的节点的数据分组继续在网络中存在并扩散等不足,提出了一个改进协议E-EPI（Extend-Epidemic）。仿真实验表明,E-EPI协议在控制节点缓存大小的前提下,能保证较好的数据到达率。     

移动Ad Hoc网络中AODV路由协议的改进

移动Ad Hoc网络研究中,路由协议是一个关键问题。鉴于Ad Hoc网络的高移动性,通信路径的稳定性显得尤为重要。本文在基于AODV（Ad Hoc On-Demand Distance Vector）按需距离矢量路由的思想上,提出一种新的双径路由改进方案。旨在提高协议的健壮性,增强网络对拓扑变化的适应能力。性能分析和仿真结果表明,改进后的AODV路由协议,降低了端到端时延,减少了数据包的丢失,提高了网络的吞吐量,使得网络的性能得到了提升。     

A design framework and taxonomy for hybrid routing protocols in mobile Ad Hoc networks

Routing protocols for mobile ad hoc networks can be classified into two categories: topological routing and geographic routing. Hybrid routing protocols that take advantage of both schemes have attracted a lot of attention recently. This article provides a systematic survey of these hybrid routing protocols. We first analyze the three types of routing information used in the hybrid routing protocols, namely, topological information, geographic information, and hierarchy information. Then, based on a review of the representative hybrid routing protocols, we summarize the three design options for hybrid routing protocols, namely, radius of the routing zone (1, k, or D), geographic information (position or position plus partition), and routing structure (flat or hierarchical). Finally, we propose a three-dimensional design framework that can accommodate well all of the existing hybrid routing protocols. The framework also helps find the unexplored design space, motivating the design of new hybrid routing protocols.     

移动Ad Hoc网络路由协议分析

文章首先简单介绍了无线自组网(Ad Hoc网络),然后分析了Ad Hoc网络与现存的一些通信系统在路由选择上的主要区别,介绍了Ad Hoc网络路由协议的分类以及几类典型的Ad Hoc网络路由协议,最后提出了Ad Hoc网络路由协议今后的主要研究方向.     

一种适用于非对称链路的Ad Hoc网络路由协议

提出了一种适用于非对称链路的Ad Hoc网络路由协议。该协议是一种基于路由池的反应式路由协议，当源节点与目标节点有数据交换时，通过路由发现过程分别在源节点和目标节点构建数据路由池和应答路由池，数据的发送和应答路径随机地从相应路由池中选取，并在数据的交换的过程中动态地更新和维护路由池。仿真结果表明该协议适用于普遍存在非对称链路的无线移动Ad Hoc网络。     

Ad Hoc网络路由协议综述

文章分析了Ad Hoc网络的特征以及路由设计协议所面临的问题与挑战,综述了Ad Hoc网络的传统路由协议,针对理想自组网路由协议应满足的7个方面,着重对适用于不同业务需求和网络需求的路由协议进行了介绍,为Ad Hoc网络路由协议的进一步研究提供了参考。     

QoS routing for MPLS networks employing mobile agents

The implementation of new networking technologies, such as multiprotocol label switching and differentiated services, will introduce powerful features to the near-future Internet backbone, making a significant contribution to the overall end-to-end provision of quality of service. However, to achieve such an improvement these technologies require not only effective support from current routing algorithms, but also enhanced capabilities, which are currently being developed. To contribute to this development, a novel and powerful scheme is introduced in this article that provides a means of supporting QoS routing through the use of mobile software agents. Specifically, we describe the use of mobile agents to efficiently realize multipoint-to-point routing trees by means of the Wave paradigm, while satisfying the QoS requirements of the set of traffic streams involved in the process. Both benefits and important issues to be considered when using mobile agent schemes in QoS routing are further stressed     

Multipath routing for video delivery over bandwidth-limited networks

The delivery of quality video service often requires high bandwidth with low delay or cost in network transmission. Current routing protocols such as those used in the Internet are mainly based on the single-path approach (e.g., the shortest-path routing). This approach cannot meet the end-to-end bandwidth requirement when the video is streamed over bandwidth-limited networks. In order to overcome this limitation, we propose multipath routing, where the video takes multiple paths to reach its destination(s), thereby increasing the aggregate throughput. We consider both unicast (point-to-point) and multicast scenarios. For unicast, we present an efficient multipath heuristic (of complexity O(|V|/sup 3/)), which achieves high bandwidth with low delay. Given a set of path lengths, we then present and prove a simple data scheduling algorithm as implemented at the server, which achieves the theoretical minimum end-to-end delay. For a network with unit-capacity links, the algorithm, when combined with disjoint-path routing, offers an exact and efficient solution to meet a bandwidth requirement with minimum delay. For multicast, we study the construction of multiple trees for layered video to satisfy the user bandwidth requirements. We propose two efficient heuristics on how such trees can be constructed so as to minimize the cost of their aggregation subject to a delay constraint.     

GSM-R应急自组网中的分簇路由算法研究

在采用分簇结构的GSM-R应急自组织网络中,簇头的选择将直接影响整个网络的性能,因此必须设计合理的分簇算法,综合考虑网络环境中的各种因素,使得形成的分簇结构具有很好的系统环境和应用需求的适应性。通过对Ad Hoc自组网中的加权分簇算法WCA（Weighted Clustering Algorithm）简单介绍,从算法的复杂度、负载均衡性和适用环境等方面对其性能进行比较和分析。本文改进一种基于组合加权思想的分簇算法,即基于簇稳定性的加权分簇算法,以下简称CSBWCA（Cluster-Stability Based Weighted Clustering Algorithm）。同时,介绍了此算法的设计思想,并仿真了加权分簇算法和基于稳定性的加权分簇算法的节点簇间转移次数R随GSM-R应急网络中参与应急通信的终端数目N和最大转移速度的变化情况以及两种分簇算法的簇头更新次数U随终端数目以及终端最大移动速度的变化情况。仿真结果表明,基于簇稳定性的加权分簇算法的性能明显优于加权分簇算法。     

无线Ad Hoc网络中功率感知路由协议的研究

能量节省是无线Ad Hoc网络中的一个研究重点.功率感知路由协议不但可以解决无线Ad Hoc网络的节能问题,同时还能够提高网络的性能.文章对目前提出的功率感知路由协议进行了分类,并分别进行了描述,最后指出了功率感知路由协议的未来研究方向.     

一个移动Ad Hoc网络中AODV-HC路由协议

提出了移动Ad Hoc网络中路由协议AODV-HC,该协议通过到目的节点的跳数,在链路中断时,能快速有效地修复路由路径,并通过到基础路径的跳数有效地减少广播风暴.实验结果表明AODV-HC比AODV有较少的平均延时和较少的路径节点跳数.     

Ad Hoc网络负载均衡路由协议研究

网络负载是影响Ad Hoc网络性能的重要因素,网络负荷比较重时,局部的拥塞将导致网络性能的下降,分析研究现有负载均衡路由协议,并利用链路层信息,结合原Ad Hoc路由协议AODV提出了一种跨层负载均衡的路由协议方案,在选路过程中引入负载均衡机制,均衡网络流量,以提高网络时延、分组到达率等性能.最后用NS2软件仿真证明了改进路由算法的优越性.     

面向VANETs城市环境的基于道路连通路由协议

路由协议是车联网VANETs的研究焦点,特别是在城市环境中,复杂路况给VANETs的路由提出挑战。为此,提出面向VANETs城市环境基于道路连通的路由RCR协议。考虑道路是静态的,建立以道路连通为基础的路由协议。RCR协议先利用数字地图知识将道路划分为不同路段,再依据车辆的位置选择网关,建立包含路段信息的路由表,最后,采用反应式路由策略建立路由。仿真结果表明,提出的RCR协议降低了端到端传输时延、提高了数据包的传递率,与GYTAR协议相比,RCR协议的端到端传输时延下降了32%。     

Multipath optimized link state routing for mobile ad hoc networks

Multipath routing protocols for Mobile Ad hoc NETwork (MANET) address the problem of scalability, security (confidentiality and integrity), lifetime of networks, instability of wireless transmissions, and their adaptation to applications.Our protocol, called MultiPath OLSR (MP-OLSR), is a multipath routing protocol based on OLSR [1]. The Multipath Dijkstra Algorithm is proposed to obtain multiple paths. The algorithm gains great flexibility and extensibility by employing different link metrics and cost functions. In addition, route recovery and loop detection are implemented in MP-OLSR in order to improve quality of service regarding OLSR. The backward compatibility with OLSR based on IP source routing is also studied. Simulation based on Qualnet simulator is performed in different scenarios. A testbed is also set up to validate the protocol in real world. The results reveal that MP-OLSR is suitable for mobile, large and dense networks with large traffic, and could satisfy critical multimedia applications with high on time constraints.     

Securing QoS signaling in IP-based military Ad Hoc networks

QoS qualifiers in the IP header are prone to attacks. Malicious modifications may lead to theft of service as well as denial of service. Standard IPsec does not cover these header fields, leaving them prone to attacks. The article proposes a variant of the IPsec authentication header that includes protection of these fields. The solution is designed for single-domain networks with planned origin, such as military ad hoc networks.