Femtocell网络中基于无线资源虚拟化的资源分配研究

发布时间：2018-05-16 14:37

本文选题：资源分配 + 无线资源虚拟化　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：随着LTE在国际上的广泛应用以及各种智能终端的普及,用户对移动业务的需求大大增加。调查资料显示,大多数语音业务和数据业务发生在室内,然而由于建筑物对无线信号的严重衰减,室内用户服务质量很难得到保证。Femtocell很好地解决了室内覆盖不足的问题,能够有效满足用户的高速率业务需求。随着近几年的发展,Femtocell因其低功率、低成本和室内覆盖好的特点成为运营商解决室内覆盖问题的热门技术。然而Femtocell在带来系统增益的同时,也带来了一些技术挑战。Femtocell采用随机部署模式,大规模Femtocell的引入会导致现有网络拓扑结构发生较大的变化,干扰环境变得更加复杂,网络规划优化变得更加困难。如果不采用新的资源分配策略来应对这些问题,网络的整体性能可能不会提升,甚至不如传统蜂窝网络。因此,有效地管理网络中的无线资源,优化网络性能显得尤为重要。同时,虚拟化在无线方面的研究逐渐出现在人们的视野,得益于其可以实现资源的整体优化和按需分配。本文首先对Femtocell网络中的干扰情况做了详细地分析,并在此基础上,从无线资源虚拟化的角度出发,提出一种基于无线资源虚拟化的资源分配算法,从映射整合、统一管理、再分配的思想着手,将无线资源进行映射,使无线资源细化为虚拟无线资源,并在虚拟资源管理层对其进行统一管理,最后基站根据虚拟资源分配结果分配实际资源。本算法兼顾网络中的频谱复用和频谱干扰,实现了两者的良好折中,同时让资源能够全局优化,按需分配。仿真证明,本文所提出的算法可以有效应对Femtocell网络中的干扰和由于网络中业务多样性和时空分布动态性造成的潮汐效应,有效提高网络性能。
[Abstract]:With the wide application of LTE in the world and the popularity of various intelligent terminals, the demand for mobile services is greatly increased. Investigation data show that most voice and data services occur indoors. However, due to the serious attenuation of wireless signals in buildings, it is difficult to ensure the quality of service of indoor users to solve the problem of inadequate indoor coverage. It can meet the needs of high speed service effectively. With the development of Femtocell in recent years, due to its low power, low cost and good indoor coverage, Femtocell has become a hot technology for operators to solve indoor coverage problems. However, Femtocell not only brings system gain, but also brings some technical challenges. Femtocell adopts random deployment mode. The introduction of large-scale Femtocell will lead to great changes in the existing network topology, and the interference environment will become more complex. Network planning optimization becomes more difficult. If the new resource allocation strategy is not adopted to deal with these problems, the overall performance of the network may not be improved, or even worse than the traditional cellular network. Therefore, it is very important to manage wireless resources effectively and optimize network performance. At the same time, the research of virtualization in wireless gradually appears in the field of vision, because it can realize the overall optimization and distribution of resources. In this paper, the interference in Femtocell network is analyzed in detail, and on this basis, a resource allocation algorithm based on wireless resource virtualization is proposed. The idea of reallocation is to map the wireless resources into virtual wireless resources and manage them uniformly in the virtual resource management layer. Finally the base station allocates the actual resources according to the virtual resource allocation results. This algorithm takes into account the spectrum multiplexing and spectrum interference in the network, realizes a good compromise between the two, at the same time, the resources can be optimized globally and allocated according to demand. Simulation results show that the proposed algorithm can effectively deal with the interference in Femtocell network and the tidal effect caused by the diversity of traffic and the dynamic distribution of time and space in the network, and improve the network performance effectively.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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