可再生能源供电下射频单元的基带 功能分割和功率控制

[摘要] 通过改变基带功能在远端射频单元（RRU）的放置，基带功能分割能实现前传带宽需求和RRU处理能耗之间的折中。首先调研了基带功能分割和可再生能源供电下无线传输功率控制的研究现状，进而针对RRU使用可再生能源供电的场景，联合优化离线的基带功能分割方案的选择和传输功率控制，包括每种基带分割方案被选择的时长及相应的传输功率，并提出了一种启发式的在线策略。数值结果表明：相比于固定的基带功能分割方案，灵活的基带功能分割能充分利用可再生能源并提高系统的吞吐量。

[关键词] 能量收集；基带功能分割；功率控制；前传网；云接入网

[Abstract] By changing the placement of the baseband function in the remote radio unit (RRU), the baseband function partition can achieve the tradeoff between the fronthaul bandwidth requirement and the RRU processing energy consumption. In this paper, the study on baseband functional split and power control in energy harvesting wireless communication systems is reviewed. Then a renewable energy powered RRU is studied, and the offline functional split scheme selection and power control are jointly optimized, specifically the transmit duration of each selected functional split scheme and the corresponding transmit power, and then a heuristic online policy is proposed. Numerical results show that flexible functional split can substantially improve the throughput compared with fixed functional split scheme, owing to better utilization of the renewable energy.

[Keywords] energy harvesting; baseband functional split; power control; fronthaul; cloud-radio access network