【作者】 朱小丽；

【导师】 宋健；

【作者基本信息】 兰州理工大学 ， 计算机应用， 2008， 硕士

【摘要】 随着科学技术的飞速发展,Internet成为了一个全球通用的网络系统,各种移动设备也得到了广泛的应用,从而如何满足移动终端用户对数据通信质量的要求已成为新的挑战。为了适应越来越多的多媒体及实时应用,使得移动节点在切换过程和切换之后仍然能够有效的享有可靠、安全、及时、低成本的传递,则就需要在研究IPv6网络的同时,引入服务质量保障技术,本系统正是基于这一理念而设计的,因此,它具有十分广泛的用途和前景。由于移动节点在移动IPv6中从移动检测到新转交地址绑定更新,从地址绑定更新到资源预留的完成之前,整个过程无法进行正常的通信,故此结合分层移动IPv6和平滑移动IPv6,提出了快速分层移动IPv6的服务质量体系,以确保通信的连续性;另外本文引入了上下文转移协议,以避免移动节点切换到新的MAP之后,需要在子网内重新建立服务信息,加快了用户要求传输的速度,使服务质量得到了保障;由于在分层快速移动IPv6中需要对MAP进行选择,经过与现有方法的比较,我们设计了新的MAP选择算法。该算法根据移动节点的移动特征和当前网络的拓扑特点进行MAP选取,减低了移动节点的服务延时,提高了网络的自治能力,更加合理的利用了分层快速移动IPv6中的MAP资源。最后本文在NS2环境中对快速分层移动IPv6的服务质量技术进行了可行性分析和测试。分析测试的结果显示该技术是一种可行的技术,它改进了现有技术的不足之处,在无缝快速切换的过程进行QoS资源预留,保证了用户定制业务传输的服务质量。但是这项技术要得到实际应用中还有很长的路要走。更多还原

【Abstract】 With the development of the modern science,internet becomes a world wide used networking system and various mobile communication devices are applied extensively in the network.It becomes new challenge how to satisfy with users’ rising needs for mobile communication quality.Internet needs a more effective method to transport the high quality multimedia and real-time date stream.Especial in the mobile IPv6 field,to promote the communicate quality,firstly,it have to insure the mobile nodes enjoy the reliable,safe,timely and cost-effective transmission during the process of switching between the mesh network.So it becomes a necessary to introduce the QoS technology in the application of the next generation mobile network.Under this kind of consideration,this paper proposed a new QoS design thinking.We believe it would have a wide range of uses and inspiring prospects.In the mobile IPv6 field,for the communication interrupted,from the mobile nodes address building and update process to the completion of the RSVP,mobile nodes can’t normal communication.In order to insure communication continuity,this paper combines the smooth mobile IPv6 with hierarchical mobile IPv6,and presents an fast hierarchical QoS system.Besides,through application of CT-RSVP scheme,it avoids rebuilding database of the service information,accelerates the transmit speed and guarantees the quality of service.In hierarchical mobile IPv6,MN have to make a MAP selection during the switching process. Compared with the exited ones,we design a new MAP selection algorithm.It can choose the most suitable MAP base on the comprehensive various factors of MN and networking topology.The simulation results show the MAP selection algorithm can reduce the communication delay,balance the MAP’ loads and make a good use of the resource of the MAP.Final,we made the simulation to test and analyze the CT-RSVP solution under the environment of NS2.Through analysis,the result indicates the technology is feasible,more advanced and lower communication cost than the existing ones.But it is far from the practical product and need more search and work.更多还原