异构融合网络垂直切换算法研究

发布时间：2018-06-15 23:15

本文选题：异构无线网络 + 垂直切换　；参考：《哈尔滨工程大学》2014年硕士论文

【摘要】：随着通信技术的快速发展和网络接入技术的不断提高,多种无线网络同时存在。网络间既彼此竞争又互相补充,构成了异构无线融合网络。其中,以WLAN与3G网络融合最具代表性。WLAN网络具有高带宽与低覆盖的特点,3G网络具有低带宽与高覆盖的特点,因此,3G与WLAN的融合能够扬长避短,充分发挥各自的优势。如何使用户在复杂的异构接入网络之间进行无缝漫游,是异构融合网络垂直切换技术重点研究内容。因此,本文通过对3G与WLAN两个具有代表性的无线网络融合为例,对异构融合网络垂直切换算法进行分析和研究。首先,本文对异构网络融合的体系架构、网络垂直切换基本概念及目前常用的垂直切换算法进行了简要的介绍,并针对典型的网络垂直切换算法进行了对比分析与归纳总结。其次,本文基于3G和WLAN重叠覆盖的网络融合架构,提出一种基于代价函数的联合网络切换判决算法,并建立一个网络垂直切换性能的评估模型,用于客观评价垂直切换算法的性能。该算法通过综合考虑网络带宽、平均接收信号强度和应用满意度因子,设计具有多个参数的代价函数,用以量化网络的性能。仿真结果表明,基于代价函数的联合网络切换算法相比传统的基于滞后余量的网络切换算法,能够更有效的降低网络切的乒乓效应,为用户提供更高的QoS保障。最后,本文针对融合网络的负载均衡问题,提出了一种基于群体博弈理论的网络垂直切换算法。文中给出一种面向群体用户的网络接入选择实现机制,该机制根据用户在网络中获得的效用函数,采用非合作博弈方法建立网络效用模型,并证明该非合作博弈满足势博弈条件。仿真结果比较了 3G与WLAN融合场景下的各群体与接入网络在非合作博弈模型中的收益特性,模拟了用户网络垂直切换过程,得到了纳什均衡点,验证了理论分析结果。
[Abstract]:With the rapid development of communication technology and the continuous improvement of network access technology, a variety of wireless networks exist at the same time. Networks compete with each other and complement each other, forming heterogeneous wireless fusion networks. Among them, the combination of WLAN and 3G network is the most representative. WLAN network has the characteristics of high bandwidth and low coverage. Therefore, the integration of 3G and WLAN can make full use of their advantages. How to make users roam seamlessly between complex heterogeneous access networks is the focus of vertical handoff in heterogeneous fusion networks. Therefore, this paper analyzes and studies the vertical handoff algorithm of heterogeneous converged networks by taking two representative wireless networks of 3G and WLAN as an example. Firstly, this paper briefly introduces the architecture of heterogeneous network convergence, the basic concept of network vertical handoff and the common vertical handoff algorithms, and compares and summarizes the typical vertical handoff algorithms. Secondly, based on 3G and WLAN overlapped network fusion architecture, this paper proposes a joint network handoff decision algorithm based on cost function, and establishes a model to evaluate the performance of network vertical handoff. It is used to evaluate the performance of vertical handoff algorithm. By considering the network bandwidth, the average received signal strength and the application satisfaction factor, the cost function with multiple parameters is designed to quantify the performance of the network. Simulation results show that the cost function based joint network handoff algorithm can reduce the ping-pong effect of network cutting more effectively than the traditional network handoff algorithm based on delay margin and provide higher QoS guarantee for users. Finally, this paper proposes a network vertical handoff algorithm based on group game theory to solve the load balancing problem of fusion network. In this paper, a realization mechanism of network access selection for group users is presented. According to the utility function obtained by users in the network, the non-cooperative game method is used to establish the network utility model. It is proved that the non-cooperative game satisfies the condition of potential game. The simulation results compare the income characteristics of different groups and access networks in the non-cooperative game model, simulate the vertical handover process of user networks, obtain Nash equilibrium points, and verify the theoretical analysis results.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53;TN925.93

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