设备直通中面向能效与用户公平性折中的联合功率控制和调度方案

Energy efficiency-user fairness tradeoff for device-to-device communication via joint power control and scheduling

设备直通通信作为5G系统中的关键技术之一,可显著提高系统侧和用户侧性能。但目前已有研究主要侧重优化前者。基于此,提出了一种联合时频域调度和功率控制机制,以实现系统能效与用户公平性间的折中。该机制包括功率控制和时频域调度两部分,其中,功率控制最大化D2D用户能效值;时频域调度确定任意时刻应接入的D2D用户数以及各自的信道资源。此外,借助比例公平思想动态更新匹配所需效用值。通过仿真,验证了所提联合机制的优势,并观察了系统整体能效和用户公平间的折中关系。

Device-to-device（D2D） communication is a promising component in the fifth generation systems, and it can significantly improve both system-side and user-side performance. However, the prior works are mainly focused on addressing the system-side metrics. Therefore, a balance was struck between EE and UF by joint consideration of power control（PC） and temporal and spectral scheduling（TSS）. Specifically, PC was intended to maximize the EE of the D2 D user. Based on the above results, TSS determined the set of admitted D2 D users and their allocated spectral resources. Moreover, the weights were updated by the idea of proportional fairness dynamically. Finally, the numerical results show the efficiency of the efficiency mechanism and the tradeoff between EE and UF.