异构无线网络的移动性管理关键技术研究
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摘要
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 IndependentHandover)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。
The future wireless network is a heterogeneous network with seamless convergence,which bases on the full IP technologies,supports a large amount of wireless access technologies and roaming service.To achieve effective convergence of the heterogeneous networks and support mobile computing、ubiquitous computing, the key is the generalized mobility management technology that is open,efficient,and access technology independent.In this thesis,the technologies about the mobility location management,the handoff decision strategy between the heterogeneous networks,the handoff management system model with multi-protocol cooperation based on MIH(Media Independent Handover)and simulation platform for heterogeneous networks with multi-interface are studied.
In this thesis,we introduce the important role of mobility prediction algorithm for heterogeneous wireless network,and propose the location prediction algorithm based on the dividing sensitive region in the cell.With the help of dividing sensitive region,the Markov predictor is optimized,which improves the prediction accuracy of the Markov predictor,and resolves the expansion problem of state-space in high exponent Markov models.We propose dividing logic cell idea by the homogeneous mappings,which can shield different characteristics of different wireless networks' cells.On the basis,the location update and paging are realized by mobility prediction algorithm in heterogeneous wireless networks.
By comparing and analyzing traditional methods of multiple attribute decision making,TOPSIS(Technique for Order Perference by Similarity to Ideal Solution)is chosen,which is with a simple calculation and the relative superior performance.The concept of fuzzy logic control is introduced for the mathematical expression of multi-attribute decision in heterogeneous wireless networks.Then the TOPSIS vertical handoff algorithm based on fuzzy logic control is given.And the adaptive control technology is also introduced for the multi-attribute handoff decision,such that the decision strategy is more in line with the actual needs of users.
With the development of the next generation network technology,SIP(Session Initiation Protocol)and FMIPv6 protocols will become the necessary ones in future heterogeneous wireless networks.But,the research on the joint multi-protocol handoff is rare in future heterogeneous wireless networks.In this thesis,to consider voice service for sensitive of the handoff delay,a handoff management system model with multi-protocol cooperation based on MIH is proposed;the theoretical research on the calculation of the pre-handoff time and the received signal strength prediction algorithm are achieved;and combining with the dynamic threshold settings,the fast handoff is realized with no occurrence of too late or too early handoff.Based on the NIST mobility package software,we develop the handoff management system with multi-protocol cooperation based on MIH and verify performance of fast handoff of the handoff management system in WiMAX-WiFi heterogeneous networks.
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。
The future wireless network is a heterogeneous network with seamless convergence,which bases on the full IP technologies,supports a large amount of wireless access technologies and roaming service.To achieve effective convergence of the heterogeneous networks and support mobile computing、ubiquitous computing, the key is the generalized mobility management technology that is open,efficient,and access technology independent.In this thesis,the technologies about the mobility location management,the handoff decision strategy between the heterogeneous networks,the handoff management system model with multi-protocol cooperation based on MIH(Media Independent Handover)and simulation platform for heterogeneous networks with multi-interface are studied.
In this thesis,we introduce the important role of mobility prediction algorithm for heterogeneous wireless network,and propose the location prediction algorithm based on the dividing sensitive region in the cell.With the help of dividing sensitive region,the Markov predictor is optimized,which improves the prediction accuracy of the Markov predictor,and resolves the expansion problem of state-space in high exponent Markov models.We propose dividing logic cell idea by the homogeneous mappings,which can shield different characteristics of different wireless networks' cells.On the basis,the location update and paging are realized by mobility prediction algorithm in heterogeneous wireless networks.
By comparing and analyzing traditional methods of multiple attribute decision making,TOPSIS(Technique for Order Perference by Similarity to Ideal Solution)is chosen,which is with a simple calculation and the relative superior performance.The concept of fuzzy logic control is introduced for the mathematical expression of multi-attribute decision in heterogeneous wireless networks.Then the TOPSIS vertical handoff algorithm based on fuzzy logic control is given.And the adaptive control technology is also introduced for the multi-attribute handoff decision,such that the decision strategy is more in line with the actual needs of users.
With the development of the next generation network technology,SIP(Session Initiation Protocol)and FMIPv6 protocols will become the necessary ones in future heterogeneous wireless networks.But,the research on the joint multi-protocol handoff is rare in future heterogeneous wireless networks.In this thesis,to consider voice service for sensitive of the handoff delay,a handoff management system model with multi-protocol cooperation based on MIH is proposed;the theoretical research on the calculation of the pre-handoff time and the received signal strength prediction algorithm are achieved;and combining with the dynamic threshold settings,the fast handoff is realized with no occurrence of too late or too early handoff.Based on the NIST mobility package software,we develop the handoff management system with multi-protocol cooperation based on MIH and verify performance of fast handoff of the handoff management system in WiMAX-WiFi heterogeneous networks.
引文
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