基于改进图着色的D2D资源分配和功率控制

D2D Resource Allocation and Power ControlBased on Improved Graph Coloring

针对蜂窝网络中D2D(Device-to-Device)用户复用蜂窝信道带来的同频干扰问题,提出了一种基于改进图着色的资源分配和功率控制算法。首先通过构建干扰图和候选集进行用户之间干扰关系建模,并定义指数型累积因子改进图着色算法,为D2D用户分配蜂窝信道;再采用基于信干噪比的闭环功率控制算法动态调整D2D用户发射功率,减小由于信道复用产生的干扰。仿真结果表明,与现有算法相比,所提算法能够有效提升系统吞吐量和D2D用户接入率,实现信道资源的合理分配。

To solve the problem of co-channel interference caused by device-to-device(D2D)users multiplexing cellular channels in the cellular network,a resource allocation and power control algorithm based on improved graph coloring theory is proposed.First,the interference relationship between users is modeled by constructing an interference graph and candidate sets,and graph coloring algorithm is improved by defining an exponential accumulation factor to allocate the cellular channels for D2D users.Then,a closed-loop power control algorithm based on the signal-to-interference noise ratio(SINR)is used to dynamically adjust the transmit power of D2D users to reduce interference due to channel reuse.The simulation results show that,compared with the existing algorithms,the proposed algorithm can effectively improve system throughput and the access rate of D2D users,and reasonably allocate channel resources.