异构无线网络接入选择策略与算法的研究

发布时间：2018-03-19 09:25

本文选题：异构无线网络　切入点：接入选择　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：在未来的通信系统中,多种无线接入技术共存。不同接入网络的技术特点不同,没有任何一种无线接入技术可以在带宽、时延、移动性支持能力、覆盖范围等方面满足用户的全部需求,异构无线网络的融合成为必然。为了能够充分利用网络资源,实现终端在异构无线网络环境下的无缝漫游,必须采用高性能的垂直切换方案。在垂直切换过程中,网络的接入选择十分关键。本文以此为切入点进行研究。本文首先介绍了异构无线网络下的移动性管理技术和垂直切换技术,总结了常见的网络接入选择策略和算法。针对传统模糊逻辑选网算法切换时延大的缺点,论文提出了一种基于低复杂度模糊逻辑的异构无线网络接入选择算法。该算法采用粗糙集对传统模糊逻辑选网算法进行优化,筛选出对选网结果影响大的核心输入参量。仿真结果表明,该算法可以在保证选网准确率条件下,大幅降低切换时延。针对多用户多网络选网场景,本文提出了一种基于匹配博弈的选网策略。分别定义了用户与网络的效用函数和匹配窗口,并在此基础上提出了基于匹配博弈的选网方法,该选网方法能够兼顾用户与网络的效用。仿真结果表明,基于匹配博弈的选网策略具有较低的阻塞率和较高的选网效率。
[Abstract]:In future communication systems, many wireless access technologies coexist. Different access networks have different technical characteristics. No wireless access technology can support bandwidth, delay and mobility. In order to make full use of network resources and realize terminal seamless roaming in heterogeneous wireless network environment, the integration of heterogeneous wireless network becomes inevitable. It is necessary to adopt a high performance vertical handoff scheme. In the process of vertical handoff, the network access selection is very important. This paper first introduces mobility management technology and vertical handoff technology in heterogeneous wireless networks, summarizes common network access selection strategies and algorithms. This paper presents an access selection algorithm for heterogeneous wireless networks based on low complexity fuzzy logic, which uses rough set to optimize the traditional fuzzy logic network selection algorithm. The core input parameters which have a great influence on the network selection results are selected. The simulation results show that the proposed algorithm can greatly reduce the handoff delay under the condition of ensuring the accuracy of the network selection. In this paper, a network selection strategy based on matching game is proposed for multi-user and multi-network network selection scenarios. The utility function and matching window of user and network are defined, and a network selection method based on matching game is proposed. The simulation results show that the network selection strategy based on matching game has lower blocking rate and higher network efficiency.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92

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