无线Mesh网中编码感知组播路由协议CAMR

网络编码是一种能够提高网络吞吐量的新技术,将网络编码应用于无线Mesh网组播对Mesh网络进一步实用化有重要意义.编码感知路由是一种能够充分识别和利用网络中的编码机会的路由.虽然已有若干个基于网络编码的单播路由协议,但无线网络中编码机会并没有被充分利用,到目前为止还没有无线Mesh网络中的编码感知组播路由协议.提出一个编码感知组播路由协议CAMR(coding-aware multicast routing).CAMR协议利用了一个新奇的编码感知路由度量CAM(coding-awarerouting metric),可以度量无线Mesh网络中节点的实际编码机会和编码能力的大小.基于CAM设计的CAMR协议可以充分利用无线Mesh网络中节点的编码机会,提高了无线Mesh网络组播的吞吐量.模拟实验验证了CAMR协议的优势及其有效性.     

无线传感器网络路由协议研究进展

无线传感器网络具有与传统网络不同的特点,且与应用高度相关.传统路由协议不能有效地用于无线传感器网络,因而人们研究了众多的无线传感器网络路由协议.在介绍无线传感器网络的特点后,提出了路由协议的分类方法,然后着重分析了当前一些较为重要的路由协议的核心路由机制,并采用比较方式指出了这些路由协议的类别、特点和主要应用范围.最后总结了好的路由协议应具有的特点以及未来的研究策略与发展趋势.     

无线传感器网络路由协议研究

无线传感器网络是新型的信息获取和处理新技术,文章简要介绍了无线传感器网络的体系结构,对当前一些较为重要的路由协议的核心路由机制进行了分析,路由协议需要进一步改进或设计新的路由协议,使网络具备更好的可伸缩型和更强的适应网络拓扑变化的能力.     

基于能量与节点缓冲区的机会路由研究

无线传感器网络作为一种新型的信息获取系统,因为具有自组织性、灵活性和低成本等特点,可以被广泛应用到军事领域、环境科学、医疗健康等各个方面,是近年来研究的热点。路由技术是无线传感器网络的关键技术之一。网络生命周期和吞吐量是衡量无线传感网络性能的重要指标。本文主要针对无线传感器网络中的机会路由协议,基于地理位置策略,综合考虑节点中能量与节点缓存因素。设计了一种具有能量自我保护,改善网络中节点能量均衡性,延长网络生命周期,提高网络吞吐量的机会路由协议(EBOR:Energy and Buffer Opportunistic Routing)。仿真实验表明,相比传统机会路由,本文提出的EBOR具有更优的网络生命周期与吞吐量。     

一种新的基于无线射频的机会网络路由

机会网络是一种能够在极端条件下互联高度异类网络的新型网络,其主要特点是不存在端到端的直接路径,数据的传输要靠存储转发过程来实现.将无线射频技术应用于机会网络中的数据传递,融合无线射频技术在数据传输过程中的无接触、无需人工干预、抗恶劣环境等特点,提出了基于无线射频的路由协议,并对其性能进行了分析和仿真,证明了该路由协议的可行性和合理性.     

WSN中一种基于EDC的机会路由协议

对于有损链接无线网络,机会路由的性能优于传统单播路由,然而由于无线传感器网络具有很强的占空比特性,使得现有的机会路由协议不适用于无线传感器网络。为此,提出一种基于占空比唤醒估计值(EDC)的机会路由协议,将EDC度量的关键特性作为路由度量,以支持分布式计算,从而生成无回路路由拓扑。通过理论分析表明EDC度量可以近似得出报文转发需要的占空比唤醒真实值。Twist和Motelab测试床上的实验结果证明,与基于预期传输次数的机会路由协议相比,该协议在无线电占空比值、时延和转发节点数量等方面性能更优。     

移动自组网中路由协议的研究

在无线移动自组网中每个节点都需要兼具路由器的功能,路由是一个非常重要的研究问题,各种无线移动自组网路由协议的提出及相关的性能分析评价也成为学术界的研究热点.本文简单比较了AODV、GPSR及ADV 3种典型的无线移动自组网路由协议,并通过NS-2仿真,对3种路由协议在UDP和TCP业务流下的平均投递率、路由开销、平均端到端延时和吞吐率网络性能进行分析及评价.     

无线mesh网络路由协议的研究

无线mesh网络是一种新型的无线宽带接人、多跳网络,它融合了无线局域网和移动Ad hoc网络的优点.根据无线mesh网络的结构特点,讨论和比较了无线mesh网络中各种路由协议的由来及其各自的特点,对现有的路由协议进行了分析和概括,指出了每种路由协议各自所具有的优缺点,最后讨论了无线mesh网络路由协议的一些应用以及未来的研究方向.     

无线传感器网络路由技术研究

无线传感器网络是当前研究和应用的热点,路由协议是其研究的重要领域.在比较与其它传统无线网络路由协议区别的基础上,归纳了无线传感器网络路由协议应具有的特性,并对近年来针对无线传感器网络提出的有代表性的路由协议进行了研究,总结了各种路由协议的特点和适合的应用场合,重点分析了它们的不足之处,最后指出了无线传感器网络路由技术未来发展的趋势.     

无线传感器网络LEACH协议性能分析

LEACH协议是专门应用于无线传感器网络的层次路由协议,在无线传感器网络路由协议中占有重要地位。本文采用理论分析与仿真实验相结合的方法,对LEACH协议的性能进行了深入研究,指出了LEACH协议路由算法的不足,明确了进一步对LEACH协议进行改进的方向。     

Survey of network coding-aware routing protocols in wireless networks

In recent times, there have been many advances in the field of information theory and wireless ad hoc network technologies. Regarding information theory progression and its connection with wireless ad hoc networks, this study presents fundamental concepts related to the application of the state-of-the-art Network Coding (NC) within wireless ad hoc networks in the context of routing. To begin with, this paper briefly describes opportunistic routing and identifies differentiation between NC-aware and NC-based routing mechanisms in wireless ad hoc networks. However, our main focus is to provide a survey of available NC-aware routing protocols that make forwarding decisions based on the information of available coding opportunities across several routes within wireless ad hoc networks. The taxonomy and characteristics of various representative NC-aware routing protocols will also be discussed. In summary, we provide a comparison of available NC-aware routing schemes and conclude that NC-aware routing techniques have several advantages over traditional routing in terms of high throughput, high reliability, and lower delay in a wireless scenario. To the best of our knowledge, this work is the first that provides comprehensive discussion about NC-aware routing protocols.     

Evaluating opportunistic networks in disaster scenarios

Forwarding data in scenarios where devices have sporadic connectivity is a challenge. An example scenario is a disaster area, where forwarding information generated in the incident location, like victims' medical data, to a coordination point is critical for quick, accurate and coordinated intervention. New applications are being developed based on mobile devices and wireless opportunistic networks as a solution to destroyed or overused communication networks. But the performance of opportunistic routing methods applied to emergency scenarios is unknown today. In this paper, we compare and contrast the efficiency of the most significant opportunistic routing protocols through simulations in realistic disaster scenarios in order to show how the different characteristics of an emergency scenario impact in the behaviour of each one of them.     

低开销的无线网络编码机会路由协议设计

针对基于无线Mesh网络编码的机会路由协议的节点转发冗余问题,从线性空间的角度对该类协议的信息传输过程进行建模与分析,提出一种基于动态冗余控制的无线Mesh网络编码机会路由协议。该协议利用零空间确认技术估计各节点的更新信息总量,根据更新总量动态调整节点转发冗余,通过引入转发优先级调度机制,避免不同的转发节点重复转发来自于相同线性空间的编码包。仿真实验结果显示,与经典的MORE协议相比,该协议能提高30％-100％的网络吞吐量,同时降低20％-45％的归一化开销。     

无线网状网中一种高吞吐量的路由策略

无线网状网（Wireless Mesh Network,WMN）是一种多跳、分布式的无线网络,可以提供多种宽带多媒体业务。目前,无线网状网的路由技术的研究还处于起步阶段。首先介绍当前几种著名的无线网状网路由协议,并分析了这些协议的不足,在此基础上提出一种新的路由算法,该算法综合考虑了链路质量、节点负载均衡、信道干扰三个主要因素,能够显著地提高网络性能。分析与仿真结果表明,该算法能显著地提高网络吞吐量和降低传输延时,并且具有良好的抗干扰性。     

Coordinated opportunistic routing protocol for wireless mesh networks

Opportunistic routing is an emerging research area in Wireless Mesh Networks (WMNs), that exploits the broadcast nature of wireless networks to find the optimal routing solution that maximizes throughput and minimizes packet loss. Opportunistic routing protocols mainly suffer from computational overheads, as most of the protocols try to find the best next forwarding node. In this paper we address the key issue of computational overhead by designing new routing technique without using pre-selected list of potential forwarders. We propose a novel opportunistic routing technique named, Coordinated Opportunistic Routing Protocol for WMNs (CORP-M). We compare CORP-M with well-known protocols, such as AODV, OLSR, and ROMER based on throughput, delivery ratio, and average end-to-end delay. Simulation results show that CORP-M, gives average throughput increase upto 32%, and increase in delivery ratio (from 10% to 20%). We also analyze the performance of CORP-M and ROMER based on various parameters, such as duplicate transmissions and network collisions, by analysis depicts that CORP-M reduces duplicate transmissions upto 70% and network collisions upto 30%.     

Opportunistic routing in wireless sensor networks powered by ambient energy harvesting

Energy consumption is an important issue in the design of wireless sensor networks (WSNs) which typically rely on portable energy sources like batteries for power. Recent advances in ambient energy harvesting technologies have made it possible for sensor nodes to be powered by ambient energy entirely without the use of batteries. However, since the energy harvesting process is stochastic, exact sleep-and-wakeup schedules cannot be determined in WSNs Powered solely using Ambient Energy Harvesters (WSN–HEAP). Therefore, many existing WSN routing protocols cannot be used in WSN–HEAP. In this paper, we design an opportunistic routing protocol (EHOR) for multi-hop WSN–HEAP. Unlike traditional opportunistic routing protocols like ExOR or MORE, EHOR takes into account energy constraints because nodes have to shut down to recharge once their energy are depleted. Furthermore, since the rate of charging is dependent on environmental factors, the exact identities of nodes that are awake cannot be determined in advance. Therefore, choosing an optimal forwarder is another challenge in EHOR. We use a regioning approach to achieve this goal. Using extensive simulations incorporating experimental results from the characterization of different types of energy harvesters, we evaluate EHOR and the results show that EHOR increases goodput and efficiency compared to traditional opportunistic routing protocols and other non-opportunistic routing protocols suited for WSN–HEAP.     

无线传感器网络的路由协议研究

无线传感器网络(WSNs)是计算机、通信和传感器3项技术相结合的产物,因其巨大的应用前景受到了越来越广泛的关注。介绍了WSNs的一些特点,指出传统路由协议不能有效应用于WSNs的路由协议;然后分类阐述了当前较为典型的路由协议,分析了它们的优缺点;对比分析了这些协议的特点;总结了路由协议设计应满足的要求、存在的挑战以及可能的研究方向。     

无线传感器网络节能路由研究

分簇结构作为一种提高能源利用率、减少网络能耗的有效途径,成为当前无线传感器网络节能路由协议的研究热点。介绍和分析了LEACH、PEGASIS和HEED三种典型节能分簇路由协议,通过对三者的综合比较总结出现有分簇路由协议存在的问题,并提出相应的解决思路。解释了要想将WiFi应用于无线传感器网络面临的困难。最后,展望了无线传感器网络路由协议未来的研究工作。     

无线传感器网络的路由协议研究

无线传感器网络（WSNs）是计算机、通信和传感器3项技术相结合的产物，因其巨大的应用前景受到了越来越广泛的关注。介绍了WSNs的一些特点，指出传统路由协议不能有效应用于WSNs的路由协议；然后分类阐述了当前较为典型的路由协议．分析了它们的优缺点；对比分析了这些协议的特点；总结了路由协议设计应满足的要求、存在的挑战以及可能的研究方向。     

Standardisation advancements in the area of routing for mobile ad-hoc networks

Mobile Ad hoc Networks (MANETs) are self-organized and fully distributed networks that rely on the collaboration of participating devices to route data from source to destination. The MANET paradigm is expected to enable ubiquitous mobile communication and thus the proliferation of pervasive applications. The MANET Working Group (WG) of the Internet Engineering Task Force (IETF) is responsible for standardizing an appropriate Internet Protocol (IP) based routing protocol functionality for both static (mesh) and dynamic (mobile) wireless ad hoc network topologies. In this paper, we provide a background on the possibility to use MANETs for enabling future pervasive internet and innovative ubiquitous services. We also describe the work achieved by the MANET WG thus far on the area of secure unicast and multicast routing for MANETs. We also examine non-IETF work on this area, chiefly based on adaptive and hybrid routing. The paper then presents comparative performance evaluations of discussed routing protocols. It is mainly observed that there is a need for adaptive hybrid routing approaches in order to support future innovative and pervasive applications. Consequently, we present our conclusions.