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Documents 异构无线网络的移动性管理关键技术研究
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  • Author Author: sophie0love
  • Date Created: 21 Nov 2010 2:11 AM Date Created
  • Last Updated Last Updated: 9 Nov 2021 4:49 PM
  • Views 554 views
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异构无线网络的移动性管理关键技术研究

未来无线网络是一种基于全IP技术、支持多种无线接入技术和漫游功能的无缝融合异构网络。要实现有效地融合各异构网络,以保证在不同网络间的无缝移动,则开放、高效、与接入技术无关的移动性管理技术是其关键。本文从移动性位置管理、异构无线网络间的切换判决策略、基于MIH(Media Independent Handover)的多协议联合切换管理系统模型和多接口异构网络仿真平台等方面对移动性管理技术进行了研究。 本文介绍了移动预测对异构无线网络移动性管理的重要作用,提出了基于敏感区域划分的位置预测算法。并以此对现有Markov预测器进行改进,提高了Markov预测器的预测精度,同时还解决了多阶Markov模型的状态空间膨胀问题。引入同构映射划分逻辑小区的思想,屏蔽不同网络的特性差异,结合移动预测算法,实现异构无线网中的位置更新和寻呼。 对比分析多种传统的多属性决策算法,选取计算简单和性能相对优越的TOPSIS(Technique for Order Preference by Similarity to Ideal Solution)算法作为多属性决策的基本方法。利用模糊逻辑控制来解决异构无线网络切换的多属性判决中语意的数学表达,提出了基于模糊逻辑控制的TOPSIS垂直切换算法。并将自适应控制技术引入多属性切换判决中,使网络的决策更符合用户的实际需要。 针对下一代无线网络中由SIP(Session Initiation Protocol)协议和FMIPv6协议组成的协议栈,本文提出了基于MIH的多协议联合切换控制系统模型,以解决话音业务对切换时延的敏感性要求,并从理论上分析了预切换时间提前量的计算和对接收信号强度的预测算法,结合动态的切换触发门限设置,实现了移动会话的快速切换,同时避免了太迟或过早的切换发生。并在NIST mobility package软件基础上,开发了基于MIH的多协议联合切换控制系统,在WiMAX-WiFi异构网络仿真环境中验证了该系统方案的快速切换性能。

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