一种基于蜂窝网络的D2D通信资源分配算法

Resource Allocation Algorithm of D2D Communication Based on Cellular Network

设备直连(Device-to-device,D2D)通信用户通过复用蜂窝用户的频谱资源可提高频谱利用率和系统的整体通信容量,但复用蜂窝网络频谱资源会带来严重的干扰,影响整体通信质量。针对干扰问题,本文通过建立通信系统模型,研究系统的线性规划问题以及相应的最佳资源分配算法。考虑到最佳算法复杂度较高,本文提出一种启发式算法来分配通信资源,通过遍历D2D对用户与蜂窝用户之间的干扰矩阵找到最小干扰值,分配复用资源给相应的蜂窝用户和D2D对用户。在蜂窝用户都分配到通信资源之后,对D2D对用户进行专用通信资源分配。仿真结果表明,该算法在降低算法复杂度的基础上显著地减小了D2D对用户对蜂窝用户的干扰,能够最大程度地增加D2D对用户的数量。

As the demand of user's communication rate and data service is gradually increasing,the communication rate and spectrum resource of cellular network cannot meet the business requirements correspondingly.The equipment of direct communication(Device-to-device,D2D)can improve the coefficient of spectrum utilization and the overall communication capacity by reusing the spectrum resources of cellular users.However,reusing cellular network spectrum resources can cause serious interference and affect the overall quality of communication.In order to mitigate interference,the linear programming problem and the corresponding optimal algorithm of resource allocation are studied by establishing the communication system model.Considering the high complexity of the optimal algorithm,a heuristic algorithm to allocate the communication resource is proposed.By traversing the interference matrix between the D2D users and the cellular users to get the minimum value,the multiplexing resources are assigned to the corresponding D2D user and cellular user.After the cellular users are allocated to the communication resources,the D2D users are assigned the dedicated communication resources.Simulation results show that this algorithm can significantly reduce the interference of the D2D users to the cellular users and increase the number of D2D users to the maximum extent.