D2D网络中联合资源分配和功率控制的干扰协调

摘要

In Device-to-Device (D2D) communications Underlaying Cellular Networks,D2D users can reuse the spectrum resources with cellular users to improve the system spectrum efficiency.However,it can cause sever cochannel interference between cellular users and D2D users.In order to coordinate the inter-tier interference caused by the reuse of spectrum resources,a joint resource allocation and power control method is proposed in this paper.Firstly,we proposed a spectrum reuse method based on the maximization of the communication distance between D2D user and cellular user to mitigate the interference from cellular user to D2D user.Furthermore,on the basis of the spectrum reuse,a user grouped joint closed loop power control (G-JCLPC) strategy based on the user target SINR requirement was given to further mitigate inter-tier interference.Simulation results show that the proposed scheme can improve the system throughput obviously.%基于蜂窝网络的Underlay D2D(Device-to-Device Communication)模式下,D2D用户通过复用蜂窝用户频谱资源通信可有效提高系统频谱资源利用率,但同时会造成蜂窝D2D网络严重的层间干扰问题.为此提出一种联合资源分配和功率控制的干扰协调算法.首先提出基于蜂窝用户到D2D用户通信距离最大化的频谱资源复用算法,以协调蜂窝用户对D2D用户的干扰;提出基于用户分组的闭环功率控制算法,基于复用同一频谱资源的蜂窝用户和D2D用户的位置信息划分高低干扰用户组,并对高低干扰用户组采用不同的路损补偿因子,以进一步协调网络层间干扰.仿真结果表明,所提方案可有效改善网络吞吐量.