异构蜂窝网络中资源分配算法的研究与仿真

发布时间：2018-01-06 22:02

本文关键词：异构蜂窝网络中资源分配算法的研究与仿真　出处：《东北大学》2014年硕士论文　论文类型：学位论文

【摘要】：为了应对近年来快速增长的移动通信系统的数据业务,满足移动通信系统用户设备(User Equipment, UE)的性能需求并提升移动通信系统的整体性能,第三代合作伙伴计划(The 3rd Generation Partnership Project,3GPP)组织在先进的长期演进技术(Long Term Evolution-Advanced, LTE-A)的标准化过程中,提出了异构蜂窝网络(Heterogeneous Cellular Networks, HetCNets)的概念。随着异构蜂窝网络技术的兴起,我们面临着许多技术挑战。基站(Base Station, BS)之间覆盖重叠的区域大大增加,导致异构蜂窝网络环境出现更加复杂的小区间干扰关系。较强的小区干扰会导致用户通话性能急剧下降甚至出现掉话；同时,与传统同构网络相比,异构蜂窝网络加入了很多不同类型的基站,相当于增加了很多小区边缘,处在边缘的用户受到的干扰就会更加复杂,这样对小区间干扰协调有了更高的技术要求。同时,在异构蜂窝网络中,由于低功率节点的部署随意性较强,不像传统宏蜂窝基站那样具有规划性,所以传统的干扰协调技术并不适用。为此,针对下一代无线异构蜂窝网络的特点,为了减少宏蜂窝基站与其覆盖范围内的低功率蜂窝基站之间的干扰,本文提出了一种异构蜂窝网络的资源分配算法,首先根据基站间干扰关系建立干扰图,通过干扰图给蜂窝基站分配相应的正交资源,然后将蜂窝基站下的用户分为中心用户和边缘用户,中心用户可以使用蜂窝网络的全部频带资源,边缘用户只能使用正交频带资源以消除蜂窝基站之间的干扰,最后用户根据改进的正比例公平算法选择合适的资源块。在异构蜂窝网络资源分配算法的基础上,,为了进一步提高网络吞吐量,在满足用户的基本性能要求下,由异构蜂窝网络下的基站确定用户资源块上的发射功率,降低基站和用户之间的相互干扰,提升蜂窝基站下用户的性能,从而提高整个蜂窝网络的吞吐量。为了评估和测试算法性能,本文分别对所设计的算法进行了理论求解和仿真。结果表明,本文所提的算法不仅可以提高异构蜂窝网络的频谱资源利用率,降低蜂窝基站之间干扰,使蜂窝基站负载平衡,还可以提升边缘用户的性能,增加网络吞吐量。
[Abstract]:In order to cope with the rapid growth of mobile communication system data services in recent years, to meet the mobile communication system user equipment user Equipment. The performance requirements of UEE and improve the overall performance of the mobile communication system. The 3rd Generation Partnership Project. The 3GPP) organization is in the process of standardizing long Term Evolution-Advanced- (LTE-A), an advanced long-term evolution technology. The concept of heterogeneous Cellular Networks (HetCNETs) is proposed. We face many technical challenges. The coverage of overlapping areas between Base Base Base stations (BSs) is greatly increased. It leads to more complex inter-cell interference relationship in heterogeneous cellular network environment. Strong cell interference will lead to a sharp decline in the performance of user calls and even drop calls. At the same time, compared with the traditional isomorphic networks, heterogeneous cellular networks join many different types of base stations, which is equivalent to increase a lot of cell edge, the edge users will be more complex interference. At the same time, in heterogeneous cellular networks, the deployment of low power nodes is arbitrary, so it is not as planned as the traditional macrocellular base stations. Therefore, the traditional interference coordination technology is not suitable. Therefore, aiming at the characteristics of the next generation wireless heterogeneous cellular network, in order to reduce the interference between the macrocellular base station and the low power cellular base station in its coverage. In this paper, a resource allocation algorithm for heterogeneous cellular networks is proposed. Firstly, the interference graph is established according to the interference relationship between the base stations, and the corresponding orthogonal resources are allocated to the cellular base stations by the interference graph. Then the users under the cellular base station are divided into the central user and the edge user. The central user can use all the frequency band resources of the cellular network, and the edge user can only use the orthogonal frequency band resource to eliminate the interference between the cellular base stations. Finally, the user selects the appropriate resource block according to the improved proportional fairness algorithm. On the basis of the resource allocation algorithm of heterogeneous cellular network, in order to further improve the network throughput. In order to meet the basic performance requirements of users, the transmission power on the user resource block is determined by the base station in the heterogeneous cellular network, which reduces the interference between the base station and the user, and improves the performance of the user under the cellular base station. In order to evaluate and test the performance of the algorithm, the proposed algorithm is solved theoretically and simulated. The proposed algorithm can not only improve the efficiency of spectrum resources in heterogeneous cellular networks, reduce interference between cellular base stations, balance the load of cellular base stations, but also improve the performance of edge users and increase network throughput.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

【相似文献】