【作者】 田永春；

【导师】 郭伟；

【作者基本信息】 电子科技大学 ， 通信与信息系统， 2004， 博士

【摘要】 随着人们对移动通信需求的增强,蜂窝移动通信系统得到了迅速普及。但蜂窝移动通信网络的管理控制方式是集中式的,网络的运行要基于预先架设好的网络设施。这两个特点使得蜂窝移动通信系统对有些特殊场合来说并不适用,例如,战场上部队快速展开和推进、发生地震或水灾后的营救。因此需要一种特殊的通信系统,这种通信系统的运行不能基于任何预先架设好的网络设施,要能实现快速动态的自动组网,节点要能移动,具有很高的抗毁性能。分层多跳无线网就是这样的一种网络。 分层多跳无线网络是一种特殊的Ad hoc网络结构,这种网络具有两种节点,移动用户和移动交换机。移动用户发起和接受呼叫,移动交换机负责网络组织和路由转发。交换机之间形成Ad hoc网络结构,而交换机和用户之间形成类似蜂窝移动通信的结构,兼有Ad hoc网络和蜂窝移动通信的优点。它不需要任何基础设施,布置简单、方便,具有很广的应用前景。而移动性管理是在移动节点的标识(节点名)及其地址(节点相对网络结构的位置)间提供时变影射的技术,其主要功能是在整个服务网络内有效支持用户、设备和服务的无缝漫游。由于分层多跳无线网的使用特点,使得在它里面进行移动性管理变得非常重要,也存在很多的问题,这些问题目前没有合适的解决方法。本文对这种网络中的移动性管理进行研究,在包括宏移动性管理、微移动性管理、用户的切换管理、路由的切换管理等方面开展了一些研究工作。 第二章针对分层多跳无线网络主要使用在军事战场以及紧急状态的特点,提出了一种采用由几个代理构成一个逻辑家乡代理的宏移动性管理策略,它和其它的宏移动性管理策略相比,最大的不同是解除了传统移动性管理的用户和家乡网络、用户和家乡代理、家乡网络和家乡代理之间的物理对应关系,用在地理上分布的多个管更多还原

【Abstract】 With the increasing requirement of mobile communication, the mobile communication system has been widespread deployed. However, because of the centralized management and control, the operation of the mobile communication network is relied on preexisted fixed network infrastructure. This makes it unsuitable for several special situations, such as the expanding and propelling of armies in battlefield, the management of rescue work after disasters like earthquake or flood happened. So networks of special structure are introduced which can be rapidly deployed without relying on any preexisted fixed network infrastructure and can also be automatically configured as well as adapted themselves to the dynamic changing of node location. One of these networks is the Hierarchical Multi-hop Mobile Wireless Networks (HMWN), as researched in this dissertation.HMWN contains two kinds of nodes, mobile users and mobile switches. Only mobile users can be sources and destinations of user data traffic, and only switches can perform the functions of routing and forwarding, as well as the organization of the network. The architecture of mobile switches forms as Ad hoc networks while the architecture between mobile switches and mobile users is similar to that of the cell mobile communication system. So HMWN inherits the advantages of both Ad hoc networks and the cell mobile communication systems. In general, the mobility management is the set of mechanisms providing time-varying mapping between the identifier of mobile users and their addresses (i.e., where the users are located with respect to the network structure). The main function of mobility management is to effectively support the seamless roam of mobile users, equipments and serviceswithin the whole service network. These characters of HMWN make it very important of mobility management. However, there are still several problems existed without any proper solutions. This dissertation studies mobility management in HMWN and pays attention to macro mobility management, micro mobility management, and user handoff management as well as the route handoff management.In Chapter 2, according to the battlefield and emergent status of the environment mainly in use of HWMN, a macro management method is proposed, which uses a few agents to compose a logical home agent to obtain high survivability. Compared with other strategies of macro mobility management, its main advantage is that the physical counterpart relationship between user and home network, user and home agent, home network and home agent is released. Based on the logical home agent composed of several physical distributed management entities, the macro mobile management obtains its high reliability and survivability and increases the update velocity of node location at the same time. It also solves the problem in traditional mobile IP that the HA must be located in the home network and the frangibility caused by single HA.In order to solve the problem of the user location management, Chapter 3 proposes a user micro mobility management algorithm combined with the advantages of HMWN, the traffic characters, user location management and route discovery. This decreases the user management overhead. Compared with other strategies, its main creativity is that the algorithm needs no special packets for location update and remarkably decreases the location overhead when the user traffic load is relatively low. So it is suitable for highly dynamic environment.Chapter 4 proposes a switch selection algorithm during user handoff. It aims to solve the selection problem when user switches to another更多还原