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Ad Hoc网络目前的主要应用领域仍然是军事方面.文中针对战场环境中装甲部队这一特殊移动自组网的运动特性及移动终端配置等特点,参考目前较为完善的AODV、DSR路由协议,提出了适用于装甲车自组网的路由协议MMAR(military mobile ad hoc network routing protocol),通过OPNET仿真表明:相对于军用移动环境,该协议比AODV、DSR能更有效地减少路由负载,并能显著提高端到端时延、相对路由开销和平均投递率等性能. 相似文献
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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。 相似文献
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无线Mesh网络(Wireless Mesh Network,WMN)是一种新兴的源于移动Ad Hoc网络的宽带无线接入技术.它通过网关节点接入因特网.实际应用中当网络接入业务量很大或网络规模扩大时,一个网关节点将成为网络接入性能的"瓶颈",大量转发的数据包将导致严重的拥塞.针对此问题提出一种基于移动自组网DSR协议的多网关选播路由协议MAMSR,仿真实验表明它能有效解决接入拥塞问题. 相似文献
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移动无线自组织网络(Mobile Ad Hoc Network,MANET)具有抗毁性强、组网灵活的特点,战场通信环境是其很重要的应用背景,基于距离向量的按需路由协议(Ad-hoc On-demand Vector Routing,AODV)在移动无线自组织网络中具有广泛的应用。针对移动无线自组网AODV路由协议,在分析其工作原理的基础上,建立网络流量的分析模型。从网络发起泛搜索路由引起网络流量变化的角度,分析不同的协议攻击方法对网络的影响。 相似文献
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Bandwidth and power constraints are the main concerns in current wireless networks because multihop ad hoc mobile wireless networks rely on each node in the network to act as a router and packet forwarder. This dependency places bandwidth, power, and computation demands on mobile hosts which must be taken into account when choosing the best routing protocol. In previous years, protocols that build routes based on demand have been proposed. The major goal of on-demand routing protocols is to minimize control traffic overhead. We perform a simulation and performance study on some routing protocols for ad hoc networks. The distributed Bellman-Ford (1957, 1962), a traditional table-driven routing algorithm, is simulated to evaluate its performance in multihop wireless network. In addition, two on-demand routing protocols (dynamic source routing and associativity-based routing) with distinctive route selection algorithms are simulated in a common environment to quantitatively measure and contrast their performance. The final selection of an appropriate protocol will depend on a variety of factors, which are discussed in this article 相似文献
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High throughput reactive routing in multi-rate ad hoc networks 总被引:3,自引:0,他引:3
A reactive routing algorithm for multi-rate ad hoc wireless networks is proposed. It enhances the AODV protocol and achieves higher throughput by utilising the multi-rate capability of the underlying wireless channel via the MAC delay routing metric. Simulations show that the protocol leads to a significant throughput increase over traditional ad hoc routing protocols. 相似文献
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ABRP: Anchor-based Routing Protocol for Mobile Ad Hoc Networks 总被引:2,自引:0,他引:2
Ad hoc networks, which do not rely on any infrastructure such as access points or base stations, can be deployed rapidly and
inexpensively even in situations with geographical or time constraints. Ad hoc networks are attractive in both military and
disaster situations and also in commercial uses like sensor networks or conferencing. In ad hoc networks, each node acts both
as a router and as a host. The topology of an ad hoc network may change dynamically, which makes it difficult to design an
efficient routing protocol. As more and more wireless devices connect to the network, it is important to design a scalable
routing protocol for ad hoc networks. In this paper, we present Anchor-based Routing Protocol (ABRP), a scalable routing protocol
for ad hoc networks. It is a hybrid routing protocol, which combines the table-based routing strategy with the geographic
routing strategy. However, GPS (Global Positioning System) (Kaplan, Understanding GPS principles and Applications, Boston:
Artech House publishers, 1996) support is not needed. ABRP consists of a location-based clustering protocol, an intra-cell
routing protocol and an inter-cell routing protocol. The location-based clustering protocol divides the network region into
different cells. The intra-cell routing protocol routes packets within one cell. The inter-cell routing protocol is used to
route packets between nodes in different cells. The combination of intra-cell and inter-cell routing protocol makes ABRP highly
scalable, since each node needs to only maintain routes within a cell. The inter-cell routing protocol establishes multiple
routes between different cells, which makes ABRP reliable and efficient. We evaluate the performance of ABRP using ns2 simulator.
We simulated different size of networks from 200 nodes to 1600 nodes. Simulation results show that ABRP is efficient and scales
well to large networks. ABRP combines the advantages of multi-path routing strategy and geographic routing strategy—efficiency
and scalability, and avoids the burden—GPS support. 相似文献
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PACMAN: passive autoconfiguration for mobile ad hoc networks 总被引:4,自引:0,他引:4
Mobile ad hoc networks (MANETs) enable the communication between mobile nodes via multihop wireless routes without depending on a communication infrastructure. In contrast to infrastructure-based networks, MANET's support autonomous and spontaneous networking and, thus, should be capable of self-organization and -configuration. This paper presents passive autoconfiguration for mobile ad hoc network (PACMAN), a novel approach for the efficient distributed address autoconfiguration of mobile ad hoc networks. Special features of PACMAN are the support for frequent network partitioning and merging, and very low protocol overhead. This is accomplished by using cross-layer information derived from ongoing routing protocol traffic, e.g., address conflicts are detected in a passive manner based on anomalies in routing protocol traffic. Furthermore, PACMAN assigns Internet protocol (IP) addresses in a way that enables their compression, which can significantly reduce the routing protocol overhead. The performance of PACMAN is analyzed in detail based on various simulation results. 相似文献
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Active routing for ad hoc networks 总被引:1,自引:0,他引:1
Ad hoc networks are wireless multihop networks whose highly volatile topology makes the design and operation of a standard routing protocol hard. With an active networking approach, one can define and deploy routing logic at runtime in order to adapt to special circumstances and requirements. We have implemented several active ad hoc routing protocols that configure the forwarding behavior of mobile nodes, allowing data packets to be efficiently routed between any two nodes of the wireless network. Isolating a simple forwarding layer in terms of both implementation and performance enables us to stream delay-sensitive audio data over the ad hoc network. In the control plane, active packets permanently monitor the connectivity and setup, and modify the routing state 相似文献
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Liang Dong 《Wireless Networks》2012,18(8):949-965
In delay-tolerant mobile ad hoc networks, motion of network nodes, network sparsity and sporadic density can cause a lack of guaranteed connectivity. These networks experience significant link delay and their routing protocols must take a store-and-forward approach. In this paper, an opportunistic routing protocol is proposed, along with its compatible media access control, for non-real-time services in delay-tolerant networks. The scheme is mobility-aware such that each network node needs to know its own position and velocity. The media access control employs a four-fold handshake procedure to probe the wireless channel and cooperatively prioritize candidate nodes for packet replication. It exploits the broadcast characteristic of the wireless medium to utilize long-range but unreliable links. The routing process seizes opportunities of node contacts for data delivery. It takes a multiple-copy approach that is adaptive with node movements. Numerical results in mobile ad hoc networks and vehicular ad hoc networks show superior performance of the proposed protocol compared with other routing protocols. The mobility-aware media access control and routing scheme exhibits relatively small packet delivery delay and requires a modest amount of total packet replications/transmissions. 相似文献
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QoS routing plays an important role for providing QoS in wireless ad hoc networks. The goals of QoS routing are in general twofold: selecting routes with satisfied QoS requirement(s), and achieving global efficiency in resource utilization. In this article we first discuss some key design considerations in providing QoS routing support, and present a review of previous work addressing the issue of route selection subject to QoS constraint(s). We then devise an on-demand delay-constrained unicast routing protocol. Various strategies are employed in the protocol to reduce the communication overhead in acquiring cost-effective delay-constrained routes. Simulation results are used to verify our expectation of the high performance of the devised protocol. Finally, we discuss some possible future directions for providing efficient QoS routing support in wireless ad hoc networks. 相似文献
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Increasing popularity and availability of portable wireless devices, which constitute mobile ad hoc networks, calls for scalable ad hoc routing protocols. On-demand routing protocols adapt well with dynamic topologies of ad hoc networks, because of their lower control overhead and quick response to route breaks. But, as the size of the network increases, these protocols cease to perform due to large routing overhead generated while repairing route breaks. We propose a multipath on-demand routing protocol (SMORT), which reduces the routing overhead incurred in recovering from route breaks, by using secondary paths. SMORT computes fail-safe multiple paths, which provide all the intermediate nodes on the primary path with multiple routes (if exists) to destination. Exhaustive simulations using GloMoSim with large networks (2000 nodes) confirm that SMORT is scalable, and performs better even at higher mobility and traffic loads, when compared to the disjoint multipath routing protocol (DMRP) and ad hoc on-demand distance vector (AODV) routing protocol. 相似文献
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To efficiently support tetherless applications in ad hoc wireless mobile computing networks, a judicious ad hoc routing protocol is needed. Much research has been done on designing ad hoc routing protocols and some well-known protocols are also being implemented in practical situations. However; one major imperfection in existing protocols is that the time-varying nature of the wireless channels among the mobile-terminals is ignored; let alone exploited. This could be a severe design drawback because the varying channel quality can lead to very poor overall route quality in turn, resulting in low data throughput. Indeed, better performance could be achieved if a routing protocol dynamically changes the routes according to the channel conditions. In this paper, we first propose two channel adaptive routing protocols which work by using an adaptive channel coding and modulation scheme that allows a mobile terminal to dynamically adjust the data throughput via changing the amount of error protection incorporated. We then present a qualitative and quantitative comparison of the two classes of ad hoc routing protocols. Extensive simulation results indicate that channel adaptive ad hoc routing protocols are more efficient in that shorter delays and higher rates are achieved, at the expense of a higher overhead in route set-up and maintenance. 相似文献
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Yanjing Sun Jianguang Sun Fangfang Zhao Zhuoxian Hu 《International Journal of Communication Systems》2016,29(1):210-225
According to the disadvantages of real time and continuity for multimedia services in ad hoc networks, a delay constraint multipath routing protocol for wireless multimedia ad hoc networks, which can satisfy quality of service (QoS) requirement (QoS multipath optimized link state routing [MOLSR]), is proposed. The protocol firstly detects and analyzes the link delay among the nodes and collects the delay information as the routing metric by HELLO message and topology control message. Then, through using the improved multipath Dijkstra algorithm for path selection, the protocol can gain the minimum delay path from the source node to the other nodes. Finally, when the route is launched, several node‐disjoint or link‐disjoint multipaths will be built through the route computation. The simulation and test results show that QoS‐MOLSR is suitable for large and dense networks with heavy traffic. It can improve the real time and reliability for multimedia transmission in wireless multimedia ad hoc networks. The average end‐to‐end delay of QoS‐MOLSR is four times less than the optimized link state routing. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献