一种Ad Hoc网络组移动模型

战术互联网是Ad Hoc网络的主要应用，在该网络环境下，节点由于作战使命及建制的约束，移动节点常呈现出“组移动”的特征且组内节点通常分布在相对狭长的地带。针对战术互联网中移动节点的移动特征，提出了一种符合战术互联网环境的组移动模型：狭长的组移动模型（CGM：Confined Group Mobility），并从网络拓扑结构和对路由协议性能的影响两个方面与目前广泛采用的参考点组移动模型（RPGM：Refefence Point Group Mobility）进行了比较。仿真表明，不同的组移动模型对Ad Hoc网络的性能仿真将产生较大的影响。     

一种新的无线Mesh网路由协议

无线Mesh网SEE-Mesh提案中的按需多径路由算法HWMP存在效率低、扩展性不强等问题.基于先应式路由思想,结合分布与集中式路由的特点,将数据链路层的平面路由方法拉伸成类似于IP路由的多级路由框架,提出了一种新的Mesh网络多径路由协议WMRP.网络仿真与性能评估表明,新协议在多项性能参数上优于原协议,较大提高了执行效率及其可扩展性.     

一种基于蚁群的机会网络多目标路由算法

机会网络是一种由移动对等通信节点组成、节点具有消息存储能力、节点间接触随机出现的网络.现有的机会网络路由协议绝大多数仅考虑针对单个路由目标进行路由决策,不能很好的适应上层应用需求或环境的变化,同时难以提高路由协议的综合性能.面向可加性可乘性,极值性三种类型的路由目标,通过运用多目标决策理论及蚁群算法,给出了一种机会网络中多目标路由算法Multiple Objective Decision Making ruting,MODM).该算法中路由决策取决于多项路由指标,能够为不同的应用需求或环境提供不同的路由服务,提高了机会网络下路由算法的综合性能.实验结果表明该算法能够根据不同的需求对多个路由目标进行优化,与传染病、First Contact等机会网络路由算法相比拥有较好的综合性能.     

无线Mesh网络公平感知路由算法设计与仿真

为了减小无线Mesh网络(WMN)路由的不稳定性,基于DSR提出了一种新的可预测公平感知路由协议算法(PFRP),利用MAC的网络状态信息传给网络层DSR路由代理,以便选择到目的地的拥塞和延时更小的最佳路由。此外,还综合考虑了通过统计和估计获得的链路可用带宽和节点队列负载容量等因素,相对于拥塞程度概念提出了一个新的路由准则"拥塞控制度"来表征网络节点传输的拥塞控制状态。大量仿真结果表明提出的路由算法体现了比DSR协议更好的网络流传输公平性及负载均衡性能,如延时和吞吐率。     

一种跨层服务发现协议的设计与仿真分析

一般认为，服务发现协议用于解决设备间的相互发现及网络服务的自动获取。对于网络可靠性差，节点移动性大的Ad Hoc网络而言，服务的自动发现至关重要，但由此带来的通讯开销和请求时延也相当显著。为此，提出了一种基于混合区域路由协议ZRP的跨层服务发现协议-CZRP。该协议通过将服务发现机制与网络层ZRP路由机制相结合，利用ZRP的混合路由及BRP广播机制，添加服务加入、查询、选择、删除等机制，可在开销较低的条件下完成服务的自动发现。仿真结果表明，在移动Ad Hoc网络环境下，CZRP可较大地降低网络通讯开销和服务请求延迟。     

移动Ad Hoc网络中基于竞争的跨层路由协议

基于IEEE 802.11 DCF协议和竞争转发的思想,提出了一种适于移动Ad Hoc网络的路由协议,即基于竞争的跨层路由(CCR)协议.协议采用位置信息辅助的BRTS/CTS/DATA/ACK四次握手机制实现对数据包的竞争转发,通过区分优先级的方法解决空洞通信问题.最后,在OPNET仿真平台下对CCR协议进行了性能评估.仿真结果表明,与DSR协议和LAR1协议相比,CCR协议具有较高的数据包投递率、较低的端到端时延和较小的控制开销.     

空间网络路由协议研究

空间网络的开放媒质、动态拓扑、分布式合作、资源受限等特点,使路由协议成为该领域的研究难点,在研究空间网络节点运行规律的基础上,提出一种空间网络路由协议,采用静态配置与动态调整相结合的路由策略,在网络拓扑变化时自动对路由进行调整。利用网络仿真软件NS2搭建了空间网络仿真平台进行仿真实验,结果表明,该协议信令开销较小,具有良好的网络性能,适合应用于空间网络。     

AD HOC网络中的一种QoS-AWARE多径路由协议

随着多媒体应用的不断发展,在Ad Hoc网络中提供QoS保证具有重要的意义.在研究节点拥塞、节点碰撞等本地信息对QoS路由影响的基础上,提出了一种在Ad Hoc网络中提供QoS保证的路由协议--基于本地信息的QoS-aware多径路由协议QAMR.该协议把带宽作为QoS参数,通过引入节点利用因子和路径利用因子来考虑可行路径处理能力问题和对业务的QoS保证.该协议的路由发现和路由维护算法是DSR协议的扩展.通过仿真和对比分析验证了QAMR协议无论在静态网络和动态网络,都具有很好的性能.     

改进的低时延全回波Q路由算法

针对传统路由算法不能适应拓扑环境及网络负载变化导致的拥塞问题,提出了一种改进的低时延全回波Q路由算法。改进算法对于原有算法附加学习率因子进行替换,使用调节范围更大、适应性更好、算法性能更稳健的双曲正割算子;改进算法根据不同网络情况自适应地调节学习率,进而提供合理的路由决策。仿真结果表明,该算法可以适应于静、动态拓扑环境,与已有的路由算法相比,改进算法能有效地减少高、低负载时数据的平均递交时间,降低路由间的振荡,提高数据包的投递率,且体现更好的稳健性。     

无线自组网中多速率敏感单播路由

针对多速率环境下按需路由协议,提出了基于延迟转发路由请求包的多速率敏感单播路由协议BDRMAU.其基本思想是中间节点根据路由请求包的发送者和本节点之间链路的传输速率,优先调度来自高传输速率链路发出的路由请求包来执行转发动作,因此,候选路由尽可能多地包含高传输速率链路,通过充分利用物理层多速率能力来提高网络吞吐量.模拟实验表明,BDRMAU较传统的协议能够较大地提高了网络吞吐量.     

Link reliability based hybrid routing for tactical mobile ad hoc network

Tactical mobile ad hoc network （MANET） is a collection of mobile nodes forming a temporary network, without the aid of pre-established network infrastructure. The routing protocol has a crucial impact on the network performance in battlefields. Link reliability based hybrid routing （LRHR） is proposed, which is a novel hybrid routing protocol, for tactical MANET. Contrary to the traditional single path routing strategy, multiple paths are established between a pair of source-destination nodes. In the hybrid routing strategy, the rate of topological change provides a natural mechanism for switching dynamically between table-driven and on-demand routing. The simulation results indicate that the performances of the protocol in packet delivery ratio, routing overhead, and average end-to-end delay are better than the conventional routing protocol.     

一种新型Ad hoc网络分簇路由协议

分簇路由协议能够提高系统性能,但也存在不足之处,维护簇结构需要复杂的簇选择算法,带来簇结构维护开销。提出了一种新的Ad hoc网络分簇路由协议,该协议利用簇的层次结构,并采用基于异常度的簇结构调整方案提高簇结构稳定性,减小路由协议开销。分析和仿真表明该协议具有控制开销小、网络性能高的特点。

Abstract：

The clustering hierarchical routing protocol have been developed to increase the system performance.Hierarchical structure has inevitably brought some drawbacks,maintaining the hierarchical structure needs more complicated cluster heads selection algorithm,which may result in the cost of maintaining cluster structure.A novel clustering structure based routing Protocol for ad hoc network was explored.It could reduce the route cost by adopting the hierarchical structure and could improve ad hoc network stability by introducing a configuration strategy based on ＂Exception Degree＂.Analysis and simulation show that the protocol is characterized with its low maintenance costs of routing and high network performance.     

QoS-aware multicast routing protocol for Ad hoc networks

1 .INTRODUCTIONA mobile ad hoc network ( MANET) is a multi-hopwireless network formed by a collection of mobilenodes without the intervention of fixedinfrastructure.Because an Ad hoc network is infrastructure-less andself-organized,it is used to provide i mpromptu com-munication facilities in harsh environments . Typicalapplication areas of mobile ad hoc networkinclude bat-tlefields ,emergency search,rescue sites and data ac-quisitionin remote areas . A mobile Ad hoc networkisalso usef…     

Ad Hoc网络可扩展性仿真分析

影响Ad Hoc网络可扩展性的因素很多，本文在特定移动模型和路由算法的前提下，提出了一个仿真模型，并利用GlomoSim仿真工具对不同结点数组成的平面结构网络逐跳时延和包丢失率进行了仿真，得出了AODV路由协议的可扩展性优于DSR协议的结论，并根据仿真结果推断出网络的规模不可能过大。     

Virtual reality mobility model for wireless ad hoc networks

For wireless ad hoc networks simulation, node＇s mobility pattern and traffic pattern are two key elements. A new simulation model is presented based on the virtual reality collision detection algorithm in obstacle environment, and the model uses the path planning method to avoid obstacles and to compute the node＇s moving path. Obstacles also affect node＇s signal propagation. Considering these factors, this study implements the mobility model for wireless ad hoc networks. Simulation results show that the model has a significant impact on the performance of protocols.     

基于拓扑维护的自适应多信道OLSR路由协议

OLSR是一种应用于无线移动Ad hoc网络的基于链路状态机制的先应式路由协议。在OLSR中,网络拓扑的动态变化会使节点掌握的拓扑信息失效,从而导致路由表项不全,影响路由性能。针对上述问题,提出了一种基于拓扑维护的自适应多信道路由协议MOLSR-TM,该协议把拓扑维护状况感知和自适应算法引入OLSR,以调整HELLO控制消息的发送频率和邻居记录表、拓扑记录表的刷新频率。性能分析和仿真结果表明,MOLSR-TM能改善节点的拓扑维护状况,增强动态拓扑适应能力,提高数据成功率、端到端时延和网络吞吐率等性能。     

Multilevel security model for ad hoc networks

Modern battlefield doctrine is based on mobility, flexibility, and rapid response to changing situations. As is well known, mobile ad hoc network systems are among the best utilities for battlefield activity. Although much research has been done on secure routing, security issues have largely been ignored in applying mobile ad hoc network theory to computer technology. An ad hoc network is usually assumed to be homogeneous, which is an irrational assumption for armies. It is clear that soldiers, commanders, and commanders-in-chief should have different security levels and computation powers as they have access to asymmetric resources. Imitating basic military rank levels in battlefield situations, how multilevel security can be introduced into ad hoc networks is indicated, thereby controlling restricted classified information flows among nodes that have different security levels.     

分层分布式Ad Hoc网络拓扑模型的研究

以战术互联网络应用环境为背景，对分层分布式Ad Hoe网络拓扑仿真模型进行了研究，提出了“分层分阶段拓扑生成算法”，拓扑仿真结果与实际网络拓扑特点相吻合。利用仿真平台Glomosim，将不同网络拓扑连接情况的组网性能参数相比较，发现分层分布式Ad Hoe网络拓扑对系统组网效率影响较大。     

Distributed QoS multicast routing protocol in ad hoc networks

1 .INTRODUCTIONMobile ad hoc networks ( MANET) , also calledthe infrastructureless mobile network or self-or-ganized network,consists of a collection of mobilenodes sharing a wireless channel without any cen-tralized control or established communication back-bone .ad hoc networks have no fixed routers ;allnodes are capable of movement and can be connect-ed dynamically in an arbitrary manner . Usually ,these nodes act as both end systems and routers atthe same ti me . Nodes of these netwo…