面向蜂窝网络的D2D多播通信的分簇和中继选择方法

传统蜂窝网络中，信道衰减的随机性和不确定性导致小区边缘用户的接收性能很差，尤其是面向视频传输等速率要求较高时其弊端更加凸显。D2D通信因其配置灵活性可作为传统蜂窝网络架构的有利补充，能有效改善边缘用户的性能。该文针对D2D通信的多播传输，分析了系统最小时延成本下的中继数量和分簇算法，提出一种基于分簇和中继选择的低时延D2D多播方案。该方案可以自适应选择多播重传中的中继的数量和中继节点到基站的距离，同时给出最优的带宽资源分配机制。仿真结果表明，与其他方案相比，所提方法能有效减少系统时延，提高边缘用户体验和系统性能。

Clustering and Relay Selection Method for Cellular Network-oriented D2D Multicast Communication

In traditional cellular networks, the randomness and uncertainty of channel attenuation lead to poor reception performance for cell-edge users, especially for video transmission and other high-speed requirements, its drawbacks are more prominent. D2D (Device-to-Device) communication can be used as a beneficial supplement to the traditional cellular network architecture because of its configuration flexibility, and the performance of edge users can be improved effectively. Aiming at the multicast transmission of D2D communication, the number of relays and the clustering algorithm are analyzed under the minimum delay cost of the system, and a low-latency D2D multicast scheme is proposed based on clustering and relay selection. This scheme can adaptively select the number of relays in the multicast retransmission and the distance from the cluster center to the base station, and at the same time, it provides an optimal bandwidth resource allocation mechanism. The simulation results show that compared with other schemes, the proposed strategy can effectively reduce the system delay and improve the edge user experience and system performance.