移动Ad hoc网络中路由协议的研究

移动Ad hoc网络由无线移动节点在没有任何现存的网络基础设施的情况下组成的自治系统,成为一个具有任意通信拓扑图模型的通信网络.由于网络节点的多跳性、有限的传输带宽、高速移动性、能量受限等特点,使路由协议成为Ad hoc网络设计的关键.主要介绍了Ad hoc网络的路由协议设计策略及分类原则,并对现有的具有代表性的路由协议性能进行了比较分析,为进一步研究提出新的课题.     

基于PPV的公平移动支付协议

结合CEMBS的设计思想,在尽量满足移动网络特性的情况下,设计了一个能在移动终端观看视频服务的即看即付的公平协议.该协议在服务请求阶段通过利用CEMBS,在乐观情况下,可信第三方移动网络运营商不需参与,就可使互不信任的User与VASP完美地实现双方的认证与会话密钥协商,同时完成了服务请求的建立,双方均是不可否认的,且整个过程只需三条消息;在支付阶段,也可以保证双方公平地进行交易.通过分析,该协议满足公平性、不可否认、原子性、认证性以及保密性等一些必备性质,且协议比较简单,应用范围比较广泛.     

基于RTM模型的OBAMP和ODMRP路由协议仿真与分析

将RTM模型引入到多播路由研究中,文章选取具有代表性的Random Waypoint,Random Walk with Reflection和West Uni Place为移动场景,以多播路由协议ODMRP和覆盖多播路由协议OBAMP为仿真对象,在不同组成员个数和速度的条件下,分别对其使用NS2模拟仿真。仿真分析可知,在速度变化明显的移动模型中,选取随机路点(RW)模型作为网络中节点的移动模式较好;对数据转发率要求高的网络适宜选取OBAMP协议,对实时性要求较高的网络多采用ODMRP协议。为设计能满足不同应用需要的Ad Hoc网络多播路由、覆盖多播路由协议提供科学参考。     

异构环境下基于移动代理的主动自组网构架

分析了移动自组网的异构性、路由协议和能量保护问题,应用移动代理和主动网络技术,给出了一个开放的、扩展性强的基于移动代理的主动自组网构架,该构架通过分群策略,使多个路由协议能在异构环境下并行工作,而且也满足移动节点能量保护的需求。     

基于CSP方法的移动自组织网络认证协议TAM的分析与改进

针对移动自组织网络认证协议应对安全威胁、满足安全目标的有效性问题,提出了采用基于通信顺序进程（CSP, communicating sequential process）和模型检测的协议分析方法,对移动自组织网络的代表性认证协议TAM进行分析、建模、检验并改进。首先采用CSP方法对TAM中参与者的通信行为建立模型、给出了安全目标的安全规范;然后利用模型检测工具FDR验证了TAM的CSP进程,结果表明TAM不满足认证性和机密性安全规范;最后对TAM进行了改进并检验,结果表明改进后的TAM满足安全目标,实验表明与TAM相比,改进的TAM在合理的簇规模情况下增加可接受的额外开销。     

一种基于遗传算法的移动无线传感器网络节能路由协议的设计

基于遗传算法设计了一种移动无线传感器网络的节能路由协议.详细阐述了整个MWSN网络中分簇的实现过程,提出了MWSN网络的电能消耗模型,基于遗传算法实现了节点剩余电量的查询与优化处理.基于OMNet++实现了协议仿真,发现该协议优于M-LEACH协议.结果显示,该协议更适合使用于能耗相对紧张而移动性较强的MWSN网络.     

CDMA 2000标准制式的移动IP协议分析

随着IPv6标准的成熟和试运行,在3G牌照下发之际,能提供随时随地的移动数据通信已成为人们的迫切需求.通过移动IP协议,移动主机可以通过一个永久的IP地址连接到任何链路上,移动主机移动后仍可以保持正常通信.为了探讨移动IP协议在运营商级商用的技术可行性,文中通过剖析移动IP协议的工作原理及主要技术特点,就移动IPv6在CDMA 2000网络中的系统结构、协议模型、路由方式及存在问题进行了探讨.     

基于不同移动模型的移动自组网多播路由协议性能研究

为了研究移动自组网中多播路由协议在不同移动模型下的性能,选取随机路点移动模型、高斯马尔科夫移动模型和参考点组移动模型,将三种移动模型的移动场景加入到NS2中,对基于部分网络编码的实时多播协议PNCRM进行仿真.结果表明,PNCRM协议在随机路点移动模型和高斯马尔科夫移动模型中的数据包投递率明显高于参考点组移动模型,但是参考点组移动模型的总开销和端到端延时是最优的.这样我们就可以根据不同的性能指标要求选择合适的移动模型.     

移动多协议融合网关的建模

多协议融合网关是一种融合多种路由协议,实现异构网络混合组网的网络设备.为验证多协议网关在移动环境下的可行性,文中在OPNET网络仿真软件的基础上,对多协议网关建立模型,并设定通过网关互操作Ad hoc、WLAN、LAN网络的仿真场景,加载Email、FTP、Database业务模拟实际网络行为.结果表明,移动多协议融合网关能实现异构网络之间数据的交换和无缝转发,保障异构网络业务的需求.     

RTP/RTCP协议在3GPP移动流媒体业务中的研究与应用

分析了3GPP移动流媒体服务框架和移动流媒体传输控制协议。重点设计了一个简易流媒体系统,实现了RTP/RTCP协议在移动流媒体业务中的应用。测试结果表明,所设计的RTP/RTCP协议栈能够满足移动流媒体业务的实时性需求。     

使用EHN-HP机制提高移动切换中TCP性能

移动通讯技术的发展促使传统有线互联网向无线移动网络延伸.TCP协议是现在互联网上使用最为广泛的端到端可靠传输协议,但TCP协议是在有线链路基础上设计的,直接在无线移动网络上使用TCP协议会造成TCP性能的下降.本文详细分析了移动切换对TCP协议造成的影响,比较并分析现有的几种解决方案,针对切换对TCP造成的影响提出了EHN-HP机制.EHN-HP机制在现有的TCP协议上进行改进,增加了切换处理机制(Handoff Process),通过网络模拟器的模拟结果表明,EHN-HP机制有效的改善了TCP协议在切换过程中的性能.     

网络切换对TCP吞吐量和公平性的影响分析

无线移动网络的发展日新月异.TCP协议是目前互联网上使用的最为广泛的端到端可靠传输协议,但其应用在无线网络上的时候,TCP性能下降明显.文中详细分析了TCP移动网络的切换对TCP造成影响的几个重要方面.最后通过在NS2上进行实验揭示了对多个TCP流公平性的影响,即切换后RTT越小的TCP流的吞吐量增长的越快,同时静态链路会夺取无线链路的链路资源.     

Ad Hoc无线网络路由协议研究与展望

AdHoc无线网络是一种无通信基础设施的临时网络 ,首先详细阐述AdHoc无线网络结构和特点 ,然后提出设计AdHoc无线网络协议时必须要满足的条件 ,并分析目前已有的路由协议 ,最后指出下一步研究方向。     

Building a signaling protocol architecture for future mobile networks

Third-generation mobile systems are emerging. These systems will support a unified user access to a variety of services, including the existing mobile and fixed network (PSTN, N-ISDN) services, the enhanced multimedia and multiparty services envisaged for broadband networks, and personal communication services as well. The role of signaling is predominant in building a flexible, efficient, and evolving system. The aim of this paper is to provide a framework for developing a signaling protocol architecture for future mobile networks. The study especially focuses on the universal mobile telecommunication system (UMTS). Within this framework various design and operational requirements imposed on UMTS can be satisfied. A method to deal with the functional complexity of UMTS is provided. Mobile networks are viewed as integral parts of the broadband infrastructure and are built upon the IN principles.     

移动自组网基于动态蜂窝的QoS路由协议

本文为移动自组网提出了一个基于动态蜂窝的QoS路由协议，它利用移动跟踪技术实现了一个分布式动态蜂窝生成协议；采用一个多Qos路由探测算法选择一条能够最大满足QoS要求的路由，并在这条路由上建立端．端主动资源预留；使用移动预测和被动资源预留技术预测源结点和目的结点可能进入的蜂窝集合，并在这些蜂窝集合与目的结点和源结点之间提前进行端．端被动资源预留；融合蜂窝动态检测技术与QoS路由修补技术自动发现和修补断裂的QoS路由．由于该路由协议模仿了固定蜂窝网络中的操作，所以，大大改善了QoS路由的性能．仿真结果表明：在满足QoS条件下，它明显提高了包传输率，减轻了路由负载．     

Maximum battery life routing to support ubiquitous mobile computingin wireless ad hoc networks

Most ad hoc mobile devices today operate on batteries. Hence, power consumption becomes an important issue. To maximize the lifetime of ad hoc mobile networks, the power consumption rate of each node must be evenly distributed, and the overall transmission power for each connection request must be minimized. These two objectives cannot be satisfied simultaneously by employing routing algorithms proposed in previous work. We present a new power-aware routing protocol to satisfy these two constraints simultaneously; we also compare the performance of different types of power-related routing algorithms via simulation. Simulation results confirm the need to strike a balance in attaining service availability performance of the whole network vs. the lifetime of ad hoc mobile devices     

A Shoelace-Based QoS Routing Protocol for Mobile Ad Hoc Networks Using Directional Antenna

In this paper, we propose a new quality-of-service (QoS) routing protocol for mobile ad hoc network (MANET) using directional antennas. The proposed scheme offers a bandwidth-based routing protocol for QoS support in MANET using the concept of multi-path. Our MAC sub-layer adopts the CDMA-over-TDMA channel model. The on-demand QoS routing protocol calculates the end-to-end bandwidth and allocates bandwidth from the source node to the destination node. The paths are combined with multiple cross links, called shoelace, when the network bandwidth is strictly limited. Due to the property of the directional antenna, these cross links can transmit data simultaneously without any data interference. We develop a shoelace-based on-demand QoS routing protocol by identifying shoelaces in a MANET so as to construct a QoS route, which satisfied the bandwidth requirement, more easily. The shoelace-based route from the source to the destination is a route whose sub-path is constructed by shoelace structure. With the identified shoelaces, our shoelace-based scheme offers a higher success rate to construct a QoS route. Finally, simulation results demonstrate that the proposed routing protocol outperform existing QoS routing protocols in terms of success rate, throughput, and average latency.     

MRSVP: A Resource Reservation Protocol for an Integrated Services Network with Mobile Hosts

This paper describes a reservation protocol to provide real-time services to mobile users in an Integrated Services Packet Network. Mobility of hosts has significant impact on the quality of service provided to a real-time application. The currently proposed network system architecture and mechanisms to provide real-time services to fixed hosts are inadequate to accommodate the mobile hosts which can frequently change their point of attachments to the fixed network. Mobile hosts may experience wide variations of quality of service due to mobility. To reduce the impacts of mobility on QoS guarantees, a mobile host needs to make advance resource reservations at multiple locations it may possibly visit during the lifetime of the connection. The currently proposed reservation protocol in the Internet, RSVP, is not adequate to make such reservations for mobile hosts. In this paper, we describe a new reservation protocol, MRSVP, for supporting integrated services in a network with mobile hosts.     

多跳蜂窝网互连性研究

将Ad Hoc网络与蜂窝网融合首要解决的问题是Ad Hoc如何接入蜂窝网,多数方案使用的是移动IP。提出了一种基于扩展Ad Hoc路由协议的多跳转发网络方案。Ad Hoc多种路由协议中可以实现Ad Hoc网络与蜂窝网互连的只有DSDV,但在移动场景中的低性能限制了它的发展。AODV是Ad Hoc路由协议中最有前途的协议,但它并不支持Ad Hoc节点接入基站的路由搜索。研究对AODV协议进行改进,以使它能支持移动节点到固定基站以及有线网络的寻路。