面向多业务的泛在网络垂直切换方法研究

发布时间：2018-05-15 09:42

本文选题：异构网络 + 垂直切换　；参考：《国防科学技术大学》2014年硕士论文

【摘要】：随着无线网络通信技术的发展,为了满足用户的个性化、多业务需求,未来网络环境将是各种异构无线网络共存的局面。当前网络通信的发展趋势和要求,是在保证服务质量(Quality of Service,Qo S)的基础下为用户提供跨异构接入网络的无缝多业务需求。垂直切换技术是泛在网络环境下多种异构网络共存的基础,是实现移动用户无缝漫游的关键和核心技术。本文主要面向多业务泛在网络的垂直切换技术展开研究,主要工作包括:1.结合当前异构无线网络的发展状况,分析了各类切换种类和切换控制方式,重点了解了垂直切换过程和性能指标,深入研究了泛在异构网络环境下一些典型的垂直切换算法。针对当前算法存在的一些缺陷,探讨性的提出了一种面向多业务泛在网络环境的多属性判决垂直切换策略。该策略采用SINR差值门限作为切换触发条件,在保证反映网络信道质量的基础上避免了“乒乓效应”。同时利用终端移动速度对候选网络进行筛选和评分,一方面考虑了移动性对网络服务质量的影响,另一方面减少了判决算法不必要的计算。在判决算法的设计中综合考虑多属性决策因素,权重设计综合考虑了网络环境和Qo S需求。另外在多业务场景应用中通过分配相应业务权重值,利用两重代价函数充分考虑了业务优先级要求并且降低了实现复杂度。2.利用3G-WLAN松耦合互联融合模型,设计实现了3G-WLAN互联网络平台系统,对论文中提出的切换策略进行了实现验证。阐述了系统的总体架构和功能模块,详述了切换模块的设计与实现,并通过搭建环境对系统进行了相关测试。测试结果表明,所设计系统能够实现用户自适应切换接入到相应网络。3.对论文提出的垂直切换策略进行仿真验证。通过设置仿真场景和网络参数,利用与典型的基于RSS判决算法做对比分析,对提出的垂直切换策略进行性能评估。仿真结果表明,本文提出的切换策略能够有效地减少切换次数,同时判决结果更好的反映Qo S需求和网络环境,提高了切换判决的科学性和合理性。本文主要面向同一时刻存在多项活跃业务的垂直切换场景,研究工作对于实现用户在未来泛在异构网络下多业务需求、无缝切换漫游具有重要的意义。
[Abstract]:With the development of wireless network communication technology, in order to meet the needs of users' individuation and multi-service, the future network environment will be the coexistence of various heterogeneous wireless networks. At present, the development trend and requirement of network communication is to provide users with seamless multi-service requirements across heterogeneous access networks on the basis of guaranteeing quality of Service quality (QoS). Vertical handoff is the basis of coexistence of heterogeneous networks in a ubiquitous network environment. It is the key and core technology to realize seamless roaming of mobile users. This paper mainly focuses on the vertical handoff technology for multi-service ubiquitous networks, the main work of which includes: 1. Combined with the development of heterogeneous wireless networks, this paper analyzes various types of handoff and handover control methods, emphasizes on the vertical handoff process and performance index, and deeply studies some typical vertical handoff algorithms in heterogeneous networks. Aiming at some shortcomings of the current algorithm, a multi-attribute decision vertical handoff strategy for multi-service ubiquitous network environment is proposed. The SINR difference threshold is used as the switching trigger condition, and the "ping-pong effect" is avoided on the basis of ensuring the quality of the network channel. At the same time, the terminal mobility speed is used to screen and score the candidate networks. On the one hand, the influence of mobility on the quality of service is considered, and the unnecessary computation of the decision algorithm is reduced on the other hand. In the design of the decision algorithm, the multi-attribute decision factors are considered comprehensively, and the network environment and QoS requirements are considered in the weight design. In addition, in the multi-service scenario application, by assigning the corresponding service weight value, the dual cost function is used to fully consider the service priority requirements and reduce the complexity of the implementation. Using the 3G-WLAN loosely coupled interconnection fusion model, the 3G-WLAN Internet platform system is designed and implemented, and the handover strategy proposed in this paper is verified. The overall architecture and function module of the system are expounded, the design and implementation of the switch module are described in detail, and the system is tested by setting up the environment. The test results show that the designed system can adaptively switch users to the corresponding network. 3. The vertical handoff strategy proposed in this paper is verified by simulation. The performance of the proposed vertical handoff strategy is evaluated by setting the simulation scene and network parameters and comparing with the typical decision algorithm based on RSS. Simulation results show that the proposed handoff strategy can effectively reduce the number of handoff, and the decision results better reflect QoS requirements and network environment, and improve the scientific and reasonable of handoff decision. This paper focuses on the vertical handoff scenarios where there are many active services at the same time. The research work is of great significance to the realization of users' multi-service requirements and seamless handoff roaming in heterogeneous networks in the future.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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