基于业务重要性的异构无线网络资源分配技术研究

发布时间：2018-08-30 18:06

【摘要】：无线接入技术的发展使得移动用户进行业务请求时有多种无线网络可以选择。为了充分发挥各无线网络的优势以及移动终端的多模工作能力,需要找到一个合理高效的策略对异构无线网络资源进行管理,以保证移动用户获得满意的业务服务,同时也能将无线网络资源最大化地进行利用,这也是本文探究异构无线网络环境下资源分配问题的主要出发点。本文主要利用效用最大化理论的框架对异构无线网络环境下的资源分配问题进行建模,采用效用值对移动终端用户的网络带宽资源分配进行满意度的量化,利用数学优化模型对带宽资源分配问题进行抽象,优化目标在于最大化移动终端的可接入数量,并且实现用户资源分配总效用值达到最大。在进行网络带宽资源问题分析过程中,本文的关键之处在于对终端用户业务重要性因素的考虑,即基于业务重要性的带宽资源分配。其核心为保证高重要性的用户业务能够在进行资源分配时优先获得带宽分配保障。为达到区分移动用户的业务重要性目标,本文在建立的优化模型目标效用函数上采用了一定的调整措施:针对多模多待终端的异构无线网络资源分配问题,在计算效用值时通过对低重要性业务设置较高的代价付出值,而高重要性业务请求则反之;在多模单待终端的异构无线网络资源分配问题中,则引入了阶梯效用值的概念,即通过阶梯函数将不同重要性业务的效用值调整至不同的值域区间,以保证高重要性业务的效用值始终处于较高的水平。通过对文中提出的两类基于业务重要性的异构无线网络带宽资源分配算法进行仿真,验证了算法在进行资源分配时对高重要性业务的带宽资源分配侧重,实现了在基于业务重要性的条件下对无线网络资源分合理调配,最大化网络的可接入移动用户数的目标。在理论分析的基础上,本文采用分级式无线资源管理框架,搭建了一个异构无线网络资源分配实验平台,并通过编程在平台上实现了移动终端带宽业务请求以及进行带宽资源调配的相关流程。
[Abstract]:With the development of wireless access technology, a variety of wireless networks are available for mobile users to request services. In order to give full play to the advantages of wireless networks and the multi-mode working ability of mobile terminals, we need to find a reasonable and efficient strategy to manage heterogeneous wireless network resources to ensure that mobile users can obtain satisfactory service. At the same time, it can maximize the utilization of wireless network resources, which is the main starting point of this paper to explore the problem of resource allocation in heterogeneous wireless networks. In this paper, the framework of utility maximization theory is used to model the resource allocation problem in heterogeneous wireless networks. The utility value is used to quantify the satisfaction of network bandwidth resource allocation of mobile end users. The problem of bandwidth resource allocation is abstracted by mathematical optimization model. The goal of optimization is to maximize the number of mobile terminals accessible and to maximize the total utility value of user resource allocation. In the process of network bandwidth resource analysis, the key point of this paper is to consider the importance factor of end-user service, that is, bandwidth resource allocation based on service importance. Its core is to ensure that the high-importance user service can obtain the bandwidth allocation guarantee first in the process of resource allocation. In order to achieve the objective of distinguishing the importance of mobile users, this paper adopts some adjustment measures on the objective utility function of the established optimization model: to solve the problem of resource allocation in heterogeneous wireless networks with multi-mode and multi-terminal. The utility value is calculated by setting a high cost value for the low-importance service, whereas the high-importance service request is vice versa. In the heterogeneous wireless network resource allocation problem of multi-mode, single-terminal, the concept of step utility value is introduced. That is to say, the utility value of different important business is adjusted to different range by step function to ensure that the utility value of high importance service is always at a higher level. Through the simulation of two kinds of bandwidth resource allocation algorithms based on traffic importance in heterogeneous wireless networks, it is verified that the algorithm focuses on the bandwidth resource allocation of high importance services. It realizes the goal of allocating the wireless network resources reasonably and maximizing the number of accessible mobile users under the condition of service importance. On the basis of theoretical analysis, this paper uses a hierarchical radio resource management framework to build a heterogeneous wireless network resource allocation experimental platform. The bandwidth service request of mobile terminal and the related flow of bandwidth resource allocation are realized by programming on the platform.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN92

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