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毕业设计(论文)
设计(论文)题目: DiffServ在无线Ad hoc网络中的应用
单位(二级学院): 通信与信息工程学院
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专业: 电子信息工程
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【摘要】无线Ad hoc网络是一种没有固定结构的自组织无线网络。它的每一个节点都可以自由移动,同时具有主机和路由器的功能,向其它节点发送数据包。随着多媒体应用的兴起和无线Ad hoc自身的商业潜力,对无线Ad hoc网络提供QoS保证成为了一个急需解决的问题。
由于无线Ad hoc网络自身具有带宽有限,拓扑动态变化的特点,在无线Ad hoc网络中实现QoS是一项非常困难的工作。目前已知的一些QoS服务模型,或其他网络的,并不适应于无线Ad hoc网络。在本文中,我们首先对网络服务质量(QoS)的内容做了相应概述,描述了两个QoS模型,IntServ和DiffServ。接着我们对目前在Ad hoc网络中的QoS研究做了概述性的分析,包括QoS信令,QoS路由和具有业务区分和资源预留能力的MAC协议,同时还对现存Ad hoc网络的QoS模型做了分析比较。最后,我们对区分服务模型进行了一些修改,使之适合无线Ad hoc的相应特征,提出了用区分服务模型实现Ad hoc网络的QoS保障的方案。最后进行了仿真验证。初步的仿真结果证明,在无线Ad hoc网络中区分服务可以在资源不够用的情况下,降低对低优先级的业务流的服务,保证对高优先级的业务流的服务,从而使得高优先级的业务流获得较大的吞吐量、较低的延迟和抖动。
【关键词】服务质量保障(QoS) 无线Ad hoc网络区分服务模型 NS
【Abstract】Mobile Ad works (s) are infrastructureless anizing works. Each node can be mobile and has routing capabilities to be able to forward packets on behalf of other nodes. Recently, because of the rising popularity of multimedia applications and mercial usage of s, QoS support in s has e an unavoidable task.
Due to the bandwidth constraint and dynamic topology of Mobile Ad works (), supporting Quality of Service (QoS) in s is a challenging task. A lot of research has been done on supporting QoS in the and work architectures, but most of them are not suitable in the environment. In this paper, firstly we review the content related with QoS , secondly we describe the existed QoS model ,IntServ and DiffServ in , and then we review the current research on QoS support in s, which includes QoS resource reservation signaling, QoS routing, and QoS Medium Access Control (MAC),and we also analyze the current QoS model . At last, we propose a differentiated service architecture for s which changes some parts in Diffserv to make it perfect with the characteristics of s. The performance of the proposed architecture is evaluated by NS simulations. Preliminary simulation results show that the proposed architecture can provide better