一种基于虚拟分区的跨小区D2 D资源分配算法

摘要

终端直通（device-to-device，D2D）技术引入蜂窝系统虽然能够提高蜂窝系统性能，但同时带来了很大的干扰。为了降低蜂窝用户对D2 D用户的干扰，提出了一种基于虚拟分区的跨小区资源分配算法。通过为D2 D接收端设置干扰限制区域来限制D2 D用户所复用的蜂窝用户资源；为了给分配相同资源的用户之间建立较大的空间分离，降低链路间的相互干扰，引入虚拟分区的概念；最后，为了使系统吞吐量达到最大，从可复用蜂窝用户的集合中选择链路质量最好的k个蜂窝用户，将其资源分配给D2 D用户。仿真结果显示，所提算法可以有效地降低蜂窝用户对D2 D用户的干扰，提高系统的吞吐量，提升系统性能。%Device-to-Device communications in cellular networks can improve the performance of the cellular system,while bringing a lot of interference.In order to alleviate the interference from cellular networks to D2D,this paper introduces a resource allocation algorithm for cross-cell D2D based on virtual sectors.First of all,the interference limited area is proposed so that cellular resources can not be located within the limited area.Secondly,in order to establish large spatial distances between users that are supposed to share the same set of radio resources,the concept of virtual sectors is presented.Finally, with the purpose of maximizing the throughput of the system,the base station selects the best channel quality of k cellular subscribers,after that,the resources of the k cellular subscribers are assigned to D2D users.The simulation results prove that the proposed algorithm can effectively reduce interference from cellular networks to D2D,improve the throughput of the sys-tem and the system performance.