基于部分频率复用的D2D资源调配方案研究

发布时间：2018-04-09 03:01

本文选题：终端直连　切入点：部分频率复用　出处：《湖北工业大学》2017年硕士论文

【摘要】：近年来移动终端数量急剧增长,人们对数据传输速率要求越来越高,5G网络的研究工作早已开始。终端直连(Device-to-Device,D2D)技术作为5G网络的主要技术之一,允许用户终端之间直接进行数据传输而不需要基站的中继,达到降低小区基站负载、增大网络容量以及降低通信时延的目的,从而满足用户的需求。然而D2D用户在进行链路传输的同时,也会给蜂窝用户带来严重的同频干扰。本论文针对干扰问题,以移动通信技术的理论和方法为基础,结合更加复杂的基于部分频率复用(Fractional Frequency Reuse,FFR)的研究场景,设计了三种资源调配方案来提升系统的性能。论文所作的主要工作与成果如下:(1)针对基于FFR的D2D通信工作模式中的资源调配问题,设计出一种模式优先级的资源调配方案。此方案中,基站按照模式顺序给处于不同位置的D2D用户调配资源。近端用户调配到专用资源,远端用户和其它用户调配到共享资源。另外,基站会为D2D用户资源的调配进行动态调整,让所有D2D用户尽可能调配到理想的资源。(2)针对传统FFR研究场景中资源调配时,边缘区域用户可能复用同一种频率而产生干扰的问题,设计了一种频带优先级的资源调配方案。通过把现有的边缘区域再划分为内边缘区域和外边缘区域,并把核心区域的频带分为3个不同的子频带,让处于核心区域、内外边缘区域的D2D用户根据不同的优先级使用资源,从而避免了小区边缘的同频干扰问题。(3)针对传统研究中D2D用户随机获取资源进行通信时资源利用率低的问题,通过模糊聚类算法把这些D2D用户按照属性差异性分成一些D2D用户组,使同一组D2D用户能复用同一个蜂窝的资源,提高资源利用率。同时为保证蜂窝用户QoS,对最优蜂窝资源如何选择进行了分析。仿真结果表明,上述方案对系统的性能都有一定提升。
[Abstract]:In recent years, the number of mobile terminals has increased rapidly.As one of the main technologies of 5G network, the terminal direct-connected Device-to-DeviceD2D (D2D) technology allows the user terminals to transmit data directly without the need of base station relay, so as to reduce the cell base station load, increase the network capacity and reduce the communication delay.In order to meet the needs of users.However, D2D users can also bring serious co-frequency interference to the cellular users while performing link transmission.In this paper, based on the theory and method of mobile communication technology, three resource allocation schemes are designed to improve the performance of the system.The main work and results of this paper are as follows: (1) aiming at the problem of resource allocation in D2D communication mode based on FFR, a resource allocation scheme based on mode priority is designed.In this scheme, the base station allocates resources to D2D users in different locations according to mode order.Near-end users are deployed to dedicated resources, remote users and other users to share resources.In addition, the base station will dynamically adjust the allocation of D2D user resources so that all D2D users can be allocated to the ideal resource as far as possible.Edge area users may reuse the same frequency and cause interference. A resource allocation scheme based on frequency band priority is proposed.By dividing existing edge regions into inner and outer edge regions, and dividing the frequency bands of core regions into three different sub-bands, D2D users in core, internal and external edge areas can use resources according to different priorities.Therefore, the problem of co-frequency interference at the edge of the cell is avoided. (3) the problem of low resource utilization when D2D users randomly acquire resources for communication in traditional research is avoided.These D2D users can be divided into some D2D user groups according to the attribute differences by fuzzy clustering algorithm, so that the same group of D2D users can reuse the resources of the same cell and improve the resource utilization.At the same time, how to select the optimal cellular resources is analyzed to ensure the QoS of cellular users.The simulation results show that the performance of the system is improved.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

【相似文献】