【作者】 薛蓉蓉；

【导师】 刘宏立；

【作者基本信息】 湖南大学 ， 电路与系统， 2004， 硕士

【摘要】 移动性管理是实现网络无缝连接的关键技术之一，对移动通信网络的性能具有决定性的作用。移动性管理的核心包括位置管理和切换管理，其中，位置管理又占有举足轻重的地位，它所产生的业务量占据了网络链路上信令交换的相当大一部分。因此设计一个优化的位置管理机制能够有效地减少网络中移动性管理的开销，改善网络的性能。 本文围绕如何优化Mobile IP中的位置管理机制展开讨论。论文在简要介绍了移动IPv4的作用、设计目标和要求等相关概念后，阐述了其位置管理机制的工作过程，包括移动检测、注册以及数据包的路由三个阶段，并着重介绍了隧道技术，同时也指出了机制中的不足之处。随后，论文又深入地讨论了移动IPv6中的位置管理机制，同样也是从移动检测、注册和数据包的路由三个方面论述了其实现过程。本文比较了移动IPv6和移动IPv4中位置管理机制的异同之处，指出前者要优越于后者。 考虑到下一代互联网将是基于IPv6的网络，所以论文在IPv6的基础上提出了一个移动位置管理机制，并详细介绍了它的工作原理。改进的机制增加了两个功能实体(外地代理和本地代理)来支持主机在域内的微移动，同时引入了寻呼功能，并在满足延时限制的条件下，基于移动主机的位置概率分布，提出了一个逐步寻呼算法。本文通过建立数学模型对注册过程和寻呼算法进行了性能分析，计算机仿真结果证明：与移动IPv6协议相比，改进机制中的注册过程在很大程度上减少了对家乡代理的频繁访问以及主干网中的注册报文流量；相较于普遍采用的一步到位的广播方式，逐步寻呼算法很明显地减少了寻呼开销，节省了宝贵的网络资源。更多还原

【Abstract】 Mobility management is considered to be one of the key technologies for realizing seamless connection. The performance of the mobile communication networks depends heavily on the effectiveness of mobility management. The operation of mobility management is divided into two related parts, location management and handoff management. The former occupies a pivotal position and results in a large amount of signaling overheads in network. So it is very important to design a fine location management mechanism, which can reduce costs to a great extent caused by mobility management and improve network communication performance.The paper mainly discusses how to optimize location management scheme in Mobile IP. After introducing some conceptions of Mobile IPv4 simply such as function, design aim, requirements and so on, the paper expounds the operation of location management scheme including movement detection, registration, routing and tunnel technology. Especially, Defects are also pointed out in this paper. Then the detailed implementation of location management in Mobile IPv6 is presented in the same way. The location management scheme in Mobile IPv6 is superior to that in Mobile IPv4 by comparing,Considering that IPv6 will be the Internet protocol in the future, therefore the paper brings forward a mobile location management scheme based on IPv6 and explains the operation in detail. The improved scheme adds two functional entities, foreign agent and local agent, to support micro mobility in domains. Especially, under delay bounds and probability distribution on mobile host location, the paper raises a multistep paging procedure. In this paper, two math models are established respectively to analyze the effectiveness of registration and paging procedure. Computer simulation results validate their advantages. Comparing with Mobile IPv6, registration process in improved scheme reduces location updates largely. Broadcast paging procedure consumes a vast amount of network resources, while multistep paging approach reduces the paging costs significantly.更多还原