移动IP分层快速切换技术的设计与仿真
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摘要
随着无线通信技术和便携式设备的发展,手机作为移动终端,数量呈现快速增长,相应的移动IP技术也成为无线局域网(WLAN)和3G技术发展的热点和新方向。移动IP是移动通信终端在移动中保持通信连接性的一组协议,它能够使手机在移动时仍能保持正在进行的通信。移动IP协议的核心问题就是切换问题,如何能够使手机终端在改变接入路由器的时候,保证足够小的切换延迟时间和丢包率,成为未来移动技术能够在手机上发展普及的关键。
     论文的研究目标是在对移动IP协议和移动切换技术进行分析和研究的基础上,结合当前在手机中采用的分层切换和快速切换两种技术的优点,运用软件工程中的瀑布模型,设计并仿真分层快速切换系统,从而提高手机终端在更换链路时的切换效率。论文主要工作包括:
     分析和研究移动IPv4和移动IPv6的相关协议和技术,包括移动IPv4与移动IPv6协议的操作流程,以及分层切换和快速切换技术,掌握移动IP的工作原理与切换技术。
     对原有的切换模型进行分析,进行分层快速切换系统的分析和设计。
     在深入研究移动切换机制的基础上,结合移动IPv6协议规范和无线切换技术原理,模拟基于移动IPv6技术的分层快速切换系统。
     在Linux平台下对分层快速切换系统进行仿真,得出仿真数据,并对结果中的切换时间和丢包率进行分析与对比。
     结果数据表明:分层快速切换机制相对与快速切换和分层切换来说,能够在一定的网络通信条件下减少切换时间和降低切换过程中的丢包率。分层快速切换技术已经在Motorola公司现在开发的Macro和Pico系列Wi-Fi手机产品上的操作系统通过仿真,取得了良好的效果,达到了预期的目标。
As the development of the wireless communication technology and portable device, the amount of mobile phone has increased quickly.The mobile IP technology and the 3G technology are becoming the new hot-spot and aspect.The mobile IP is the technology that is satisfied as keeping connection when mobile communication terminal is moving, it can still keep the connection when the mobile is moving. The kernel of this technology is handover problem, and how can make sure that keeping the handover delay time and losing rate as small as possible when the mobile terminal keeping the communication will become the key-point whether the mobile technology can be used in the mobile terminal.
     The target of the paper is based on my studying the mobile IP and mobile handover technology, and integrated the advantage of newest hierarchical handover and fast handover which have been adopted in the phone, I design and simulate the hierarchical-fast handover system using the method of waterfall model in the software development, this system can improve the mobile terminal's efficiency when handover. The paper mainly contains the following work.
     First, studying mobile IPv4 and mobile IPv6's protocol and technology, which includes the protocol of mobile IPv4 and IPv6's operating procedures and the operation of hierarchical handover and fast handover.Mastering the principle.
     Second, through analyzing the original handover system; I finish the requirements analysis and design of the hierarchical-fast handover system.
     Third, based on the deeply studying of mobile handover technology, I design and simulate the hierarchical-fast handover system.
     Forth, comparing the handover time and losing rate using test data from testing the hierarchical-fast handover system on the platform of Linux.
     The result data can prove that hierarchical-fast handover system can reduce the handover time and losing rate under some communicating network conditions. The research results of this paper have been applied in the Macro and the Pico's Wi-Fi mobile phones which are manufactured by Motorola, and achieved greatly.
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