摘要
移动Ad Hoc网络是一种具有高度动态拓扑结构、节点任意移动的自组织网络。随着它在各个应用领域的发展,如何把多个移动Ad Hoc网连成一个大网络以及如何与有线Internet相结合,即移动Ad Hoc网络的互联问题,成为当今移动Ad Hoc研究领域的热点。互联使得移动Ad Hoc原本较小的网络规模得以扩大,移动终端可以在各个Ad Hoc子网之间自由移动,这时需要在这个网络中引入移动管理技术,用来对移动终端进行位置的跟踪和管理。它是实现移动Ad Hoc互联的重要技术之一。
本文将对移动Ad Hoc网络的互联及移动管理技术从以下两个方面进行研究。第一,在分析移动Ad Hoc网络互联的不同应用环境的基础上,构造出移动Ad Hoc网络之间的互联及其与Internet的互联两种模式,并就互联的实现和其中出现的问题给出解决方案。第二,以上述两种互联模式的结构为基础,提出一种有效的移动管理方法,包括位置管理和切换管理,它能够适应移动Ad Hoc网络多跳及动态拓扑的特点,保证移动终端在网络覆盖范围内任意移动时位置被及时发现跟踪并保持与网络的连通,并在完成移动管理任务的前提下尽量减轻由管理控制数据包带来的网络负担。本文主要讨论了移动Ad Hoc网络的各种互联模式,移动Ad Hoc网络中的移动管理技术,以及在分析这种移动管理技术存在的问题的基础上采用新的思路提出了改进的移动管理技术,即分层分布式管理,并通过几个方面的性能比较分析改进的效果。
Mobile Ad Hoc Network is a self-organized network with dynamic topologic structure and free movement of nodes. It has become a topic of general interest to connect several mobile Ad Hoc networks to make a larger network and connect a mobile Ad Hoc network to Internet. Connectivity makes the scale of mobile Ad Hoc network get larger, and every mobile terminal can move freely among sub networks. To maintain the communication between a mobile terminal and another during the course of the movement through sub networks, mobile management has to be applied to trace and manage the location of mobile terminal, which is one of the most important technologies in implementing the connectivity of mobile Ad Hoc network.
In this paper, the connectivity and mobile management of mobile Ad Hoc network is studied in the following two aspects. First, based on the analysis of various application environment of mobile Ad Hoc network, two modes of connectivity, that is
the connectivity among mobile Ad Hoc networks and the connectivity of mobile Ad Hoc network to Internet, are structured, and the solving scheme for its implementation and the problems existing is provided. Second, on the base of the above, two connectivity modes, an efficient method of mobile management, including the management of location and hand-off, is given. This method can be suitable to the characters of multi hops and dynamic topology of mobile Ad Hoc network, guarantee the mobile terminal to be detected and traced and the connection with the network when moving freely in the range of the network, and lighten the burden of the network caused by the management data packets. This paper mainly discusses two connectivity modes of mobile Ad Hoc network and mobile management in mobile Ad Hoc network, provides an improved scheme of mobile management based on the analysis of the problems existing in the above mobile management technology, and analyses the performance of the improved scheme in several aspect.
引文
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