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基于QoS路由及保障路由实施是支持MANET应用的关键.为解决MANET中QoS问题,在移动预测机制下提出了一种基于QoS保障的组播协议.该协议通过簇头选举,移动预测和QoS控制策略在组播源与含目的节点的组播簇头间确定最稳传输路径,并采用基于动态资源管理的QoS路由模型来保障路由实施.仿真结果显示该方案可获得较高传输成功率和较低控制开销,能有效支持MANET中具有QoS需求的组播传输. 相似文献
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本文首先阐述了移动Ad Hoc网络的特点及应用。接着对当前的几种Ad Hoc网络的QoS主要路由协议进行了分析,特别是对IETF的MANET推荐的AODV路由协议作了详细的分析。并从路由机制、单向链路的支持、多播功能、QoS参数选择以及节能几个方面进行了比较和分析。 相似文献
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基于MANET的QoS路由协议研究 总被引:2,自引:1,他引:2
移动自组网(MANET)是建立军事和民用快速通信系统的理想技术。如何在MANET中提供不同的服务质量(QoS)是其面临的一个重要问题,而QoS路由技术则是其中的核心技术和热点问题。文章对不同研究者提出的几种QoS路由算法进行了分析和研究,并从单向链路的支持、多播功能以及QoS参数选择几个方面进行了比较和分析,有助于进一步改进和完善MANET的QoS路由技术。 相似文献
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MANET是由一系列动态节点主机临时组成的多跳性无线网络。由于其拓扑的动态性,传统路由协议不再适应本网络。为降低控制开销,满足QoS需求,并考虑到隐藏终端等问题,论文提出了一种基于单向链路的QoS路由协议QRUL。该协议采用按需方式查找路由,并通过选取满足QoS条件(链路带宽和传输延时)的最短传输路径来实现。仿真结果表明该协议具有良好的网络性能,能有效支持多媒体信息传输。 相似文献
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移动自组网(MANET)与Internet的互联能有效扩展Internet覆盖和MANET应用范围。针对既有互联协议无法适应MANET动态变化的网络条件,在网关发现过程中形成广播风暴以及将全局路由建立于单向链路上等原因所导致的互联性能恶化,提出了一种具有自适应增强机制的互联协议,该协议一方面依据实际网络条件与Internet访问需求自动调整网关通告分组在MANET中的覆盖范围;另一方面,基于网络条件自适应调整发送间隔的HELLO分组可同时避免全局路由计算过程引入单向链路以及形成广播风暴。仿真结果表明,此自适应增强协议能够以合理的开销,在复杂而多变的应用环境下为MANET提供优化的互联性能。 相似文献
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杨鹏 《计算机工程与应用》2008,44(5):140-142
随着多媒体业务的普及,如何为MANET多播路由提供QoS保障成为研究热点。提出了一种带宽和时延受限的QoS多播路由协议,它利用遗传算法搜索满足QoS要求的最优多播树。仿真结果表明该协议收敛速度快,寻径成功率高,它为移动网络中具有QoS保障的多播通信提供了一种有效途径。 相似文献
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With the advance of various wireless access technologies, the demand for a mobile user equipped with multiple air interfaces simultaneously executing diverse applications emerged. In such network environments, per-application mobility management is a key to allow each application of an end user device to dynamically and fully take advantage of the most suitable access technology. In this paper, we devised a comprehensive architectural platform with cross-layer techniques to realize this disruptive technology, i.e., per-application mobility management. The proposed platform enables the triggering of vertical handover decisions based on the dynamic measurements from the entire protocol stack. For per-application, the handover decision as well as the mobility management and the transport/application protocol control adaptation for handover performance optimization are made with cross-layer techniques. Through the simulation results, it is shown that multi-layer handover triggering of the proposed platform enhances the QoS of the application services by making handover decisions when the QoS requirements of an application is not satisfied as well as when a mobile user moves out of the current access network in overlay network environments. It is also presented that per-application handover based on the proposed platform enhances the QoS of the application services compared to the handover approaches which make every on-going service flows handover together to the same access network. 相似文献
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论文针对移动自组网提出了一种基于动态簇的MAC协议和QoS路由算法,使用全分布式动态簇生成算法实现了对网络拓扑的分簇与维护;利用正交编码原理和蜂窝小区技术实现了基于动态簇的MAC协议;融合资源预留、移动预测和后备路径技术实现了具有QoS保障的路由算法。仿真结果对比表明:在满足QoS条件下,它提高了路由效率。 相似文献
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通过考虑用户移动性和QoS要求,设计了移动无线因特网中的一种扇形资源弹性预约机制,包括运动预测、资源预约和QoS协商。该机制还考虑了移动用户频繁切换的解决方法 。仿真研究表明,扇形资源弹性预约机制可以有效地保证移动用户的QoS。 相似文献
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随着多媒体应用的普及,服务质量(Quality of Service,QoS)保证已逐渐成为Ad Hoc网络必须支持的一项重要功能,QoS 路由对实现Qos保证起着非常重要的作用,而带宽又是QoS保证的最重要参数之一,因此提出了一种基于TDMA的带宽约束的Ad Hoc网络QoS按需路由协议。该协议采用了启发式的带宽计算算法。仿真结果验证了协议的有效性,表明该QoS路由协议具有较好的端到端性能,可以满足Ad Hoc网络的路由需求。 相似文献
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Quality of Service (QoS) value prediction and QoS ranking prediction have their significance in optimal service selection and service composition problems. QoS based service ranking prediction is an NP-Complete problem which examines the order of ranked service sequence with respect to the unique QoS requirements. To address the NP-Complete problem, greedy and optimization-based strategies such as CloudRank and PSO have been widely employed in service oriented environments. However, they pose several challenges with respect to the similarity measure based QoS prediction, trap at local optima, and near optimal solution. Hence, this paper presents Improved Binary Gravitational Search Strategy (IBGSS), an optimization based search strategy to address the challenges in the state-of-the-art QoS value prediction and service ranking prediction techniques. IBGSS employs improved cosine similarity measure, and Newton–Raphson inspired Binary Gravitational Search Algorithm (NR-BGSA) for accurate QoS value prediction and optimal service ranking prediction respectively. The effectiveness of IBGSS over the state-of-the-art QoS value prediction and ranking prediction techniques was validated using two real world QoS datasets, namely WSDream#1 and web service QoS dataset in terms of various statistical measures (Mean Absolute Error (MAE), Root Mean Square Error (RMSE), and Average Precision Correlation (APC)). 相似文献