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移动代理技术在Ad Hoc无线网络中的应用研究 总被引:1,自引:0,他引:1
Ad Hoc无线网络是一组具有路由和转发功能的移动节点组成的一个多跳的临时性自治系统,是一种无中心的无线网络。现有的主动路由协议或者按需路由协议都不能很好地满足Ad Hoc网络的需要。介绍了Ad Hoc无线移动网络和移动代理技术。在分析了现有的2种路由协议后,提出了在按需路由协议中加入移动代理技术来增强Ad Hoc无线网络的性能。在这些结果的基础上,提出了移动代理通信协议。 相似文献
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介绍了无线Ad Hoc网络的特点和面临的安全问题,分析了移动代理在Ad Hoc网络入侵检测系统中的适用性,给出了一种基于移动代理的无线Ad Hoc网络入侵检测系统模型。 相似文献
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基于随机竞争和冲突解决的思想,本文为多跳移动Ad Hoc网络提出了一种分布式服务质量(QoS)保证的多址接入(QMA)协议.该协议中,节点在发送业务分组前利用预报突发进行竞争接入,节点根据业务分组时延情况和最早失效优先原则确定预报突发的长度,所发预报突发能持续到最后的节点优先获得接入.同时,具有实时业务的节点可以按照其优先级在更早的竞争微时隙中开始发送预报突发,而有非实时业务的节点只能在前面竞争微时隙空闲的情况下,才能在后面的微时隙开始发送预报突发,因此发送实时业务的节点可以比发送非实时业务的节点更优先接入信道,从而在移动Ad Hoc网络中实现了对多媒体业务的QoS保证.最后利用OPNET仿真评估了QMA协议的多址性能,并与IEEE 802.11e协议的性能做了比较,结果表明QMA协议可以提供较高的吞吐量和较低的实时业务时延. 相似文献
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针对实现移动用户无线上网的需求,通过对移动AdHoc网络的体系结构和路由技术的研究,以及对移动IPv6协议的工作原理及其与IPv4特性的比较分析,提出了AdHoc网络基于IPv6的Intemet接入方法,并对其地址自动配置、路由发现、网关发现、协议转换和分组转换等关键技术进行了分析,同时针对这两种技术相结合存在的广播和多跳问题提出了改进方法,并对今后的工作进行了展望。 相似文献
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本文提出了一种应用于移动Ad Hoc网络中的功率控制MAC(medium access contr01)协议,通过两个通信节点之间的控制包中的信息交换来决定数据包的发送功率以及其它邻节点下一次发送RTS控制包的功率。通过仿真与IEEE 802.11 MAC协议进行比较,由仿真结果可以看出,该协议能大大减少移动节点消耗的功率,提高节点的能量利用效率,并保持系统的吞吐量性能。 相似文献
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移动Ad Hoc网络快速发展的同时,其中的服务质量(QoS)保障问题也日渐突出.设计了一种适用于移动AdHoc网络中多路径路由协议的路径选择和带宽分配算法,选择适合业务传输的路径,并合理分配带宽,实现QoS保障.计算机仿真表明,该算法能够适应移动Ad Hoc网络的动态性、不稳定性,有效地实现QoS保障,改善网络整体性能. 相似文献
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移动Ad Hoc网络是一种特殊的自组织无中心多跳的无线网络,网内节点所具有的移动和分布特性使得安全成为网络设计的重点。本文首先对移动Ad Hoc网络的特点进行了介绍,然后结合移动Ad Hoc网络的特点分析了移动Ad Hoc网络面临的安全威胁,最后从系统体系结构的角度对移动Ad Hoc网络的安全问题进行了详细讨论。 相似文献
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Current quality of service (QoS) routing schemes for low earth orbit (LEO) satellites IP networks either neglect the varying population density or fail to guarantee end-to-end delay. As a remedy, QoS routing protocol based on mobile agent (QoSRP-MA) is proposed. QoSRP-MA is a source-based routing protocol. Once connection requests arrive, QoS mobile agents are dispatched from ingress satellite to explore routes, which migrate using satellite routing tables. Upon arriving in egress satellite, QoS mobile agents migrate back towards ingress satellite to reserve bandwidth. To construct satellite routing tables, load balancing routing algorithm based on mobile agent (LBRA-MA) is presented. In LBRP-MA, at regular intervals mobile agents launched on all satellites migrate autonomously to evaluate path cost and update routing tables. Moreover, path cost between source and destination is evaluated considering satellite geographical position as well as inter-satellite link (ISL) cost. Furthermore, ISL congestion index is considered to update routing table. Through simulations on a Courier-like constellation, it shows that QoSRP-MA can achieve guaranteed end-to-end delay bound with higher throughput, lower connection failing ratio and signaling overhead compared to high performance satellite routing (HPSR) scheme. 相似文献
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Habib M. Ammari 《International Journal of Communication Systems》2007,20(8):943-968
Connecting wired and wireless networks, and particularly mobile wireless ad hoc networks (MANETs) and the global Internet, is attractive in real‐world scenarios due to its usefulness and praticality. Because of the various architectural mismatches between the Internet and MANETs with regard to their communication topology, routing protocols, and operation, it is necessary to introduce a hybrid interface capable of connecting to the Internet using Mobile IP protocol and to MANETs owing to an ad hoc routing protocol. Specifically, the approaches available in the literature have introduced updated versions of Mobile IP agents or access points at the edge of the Internet to help MANET nodes get multi‐hop wireless Internet access. The main differences in the existing approaches concern the type of ad hoc routing protocol as well as the switching algorithm used by MANET nodes to change their current Mobile IP agents based on specific switching criteria. This paper surveys a variety of approaches to providing multi‐hop wireless Internet access to MANET nodes. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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G. Varaprasad 《International Journal of Communication Systems》2014,27(1):163-170
Wireless ad hoc networks are growing important because of their mobility, versatility, and ability to work with fewer infrastructures. The mobile ad hoc network is an autonomous system consisting of mobile nodes connected with wireless links. Establishing a path between two nodes is a complex task in wireless networks. It is still more complex in the wireless mobile ad hoc network because every node is no longer as an end node and an intermediate node. In this paper, it focuses on design of connectionless routing protocol for the wireless ad hoc networks based on the mobile agent concept. The proposed model tries to discover the best path taking into consideration some concerns like bandwidth, reliability, and congestion of the link. The proposed model has been simulated and tested under various wireless ad hoc network environments with the help of a different number of nodes. The results demonstrate that the proposed model is more feasible for providing reliable paths between the source and destination with the minimum control message packets over the network. It has delivered more number of packets to the destination over the network. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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李晓明 《电信工程技术与标准化》2015,28(7)
移动通信网一代代的变革,通过核心网、无线接入和终端的演进一步步推进或满足着不断出现的移动互联网业务.如今它已然是最大的移动互联网,而其它渐渐成为该移动互联网的承载网或是互联子网.未来它承载着"移动互联网+"梦想改变我们的生活、工作、学习和社会的方方面面. 相似文献
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在4G时代手机上网成为人们日常生活的主要活动,但对于自控能力较弱学生等群体存在普遍的上网管控需求。传统的上网管控方案需要依赖特殊定制的终端和特殊的APP软件,存在硬件依赖强、成本高、易破解、可推广性差等缺点。本文分析了运营商HLR和PCC等核心能力,并提出了基于PCC限速技术的移动数据上网管控方案。通过结合APP端和Web端管控平台,实现灵活可自定义的限速规则,可同时满足家长和学校的管控需求,具有推广成本低、用户体验好等优点。 相似文献
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To provide a multicasting service, several multicast protocols for mobile hosts (MHs) have been proposed. However, all of these protocols have faults, such as non‐optimal delivery routes and data loss when hosts move to another network, resulting in insecure multicast data transmissions. Thus, this paper presents a new reliable and efficient multicast routing protocol for mobile IP networks. The proposed protocol provides a reliable multicast transmission by compensating the data loss from the previous mobile agent when a MH moves to another network. In addition, an additional function allows for direct connection to the multicast tree according to the status of agents, thereby providing a more efficient and optimal multicast path. The performance of the proposed protocol is confirmed based on simulations under various conditions. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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提出了一种通过多播中组管理功能完成移动IP位置管理方法。每一个自治网络中都设置一个移动路由代理(MA),形成一个管理移动节点位置绑定信息的虚拟专用网,通过将与移动主机通信的节点联合起来构成一棵多播树,使网络中各节点相互合作维护移动节点的位置更新。设计了绑定信息表的存储结构和管理移动位置绑定信息的算法。模拟实验表明,提出的基于多播的位置管理方案能够使通信对端实时了解移动节点的转交地址,减少向家乡代理注册的时间和次数,减小了传输延迟,为实时业务传输提供较好的支持。同时减轻了家乡代理和各主机的负担,使移动IP的性能得到优化。 相似文献