无线能量传输支持的设备到设备多播能量协作传输机制  

Wireless power transfer supported device-to-device multicast energy cooperative transmission scheme

作　　者：曾闵[1,2] 罗颖 江虹[1,2] Zeng Min;Luo Ying;Jiang Hong(School of Information Engineering,Southwest University of Science and Technology,Mianyang 621010,China;Robot Technology Used for Special Environment Key Laboratory of Sichuan Province,Mianyang 621010,China)

机构地区：[1]西南科技大学信息工程学院,绵阳621010 [2]特殊环境机器人技术四川省重点实验室,绵阳621010

出　　处：《物理学报》2022年第16期427-438,共12页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61771410);四川省科技厅基础研发计划(批准号:2021YJ0097);西南科技大学博士基金项目(批准号:18zx7144)资助的课题。

摘　　要：能量采集支持的设备到设备多播通信(energy harvesting(EH)-supported D2D(device-to-device)multicast communications,EH-D2MD)传输过程中,簇头将面临可用能量缺失和高能量消耗需求的矛盾问题.无线能量协作技术是解决该矛盾问题的一种可行方案.借助无线能量传输技术,D2D多播簇员传输部分可用能量给簇头,共同承担内容卸载,以提升多播簇的传输鲁棒性.于是,建立了EH-D2MD通信在复用蜂窝频谱资源前提下的能量协作传输机制;该机制对频谱复用过程中的能量采集,协作以及数据传输进行了合理规划,并以多播簇传输速率最大化为优化目标,联合优化多域资源(包括:频谱资源分配、协作时间因子规划、功率控制).为了探讨EH-D2MD通信场景的极限性能,提出一种近似下界的凸联合求解方案.经与暴力搜索算法对比,提出方案可得到多播传输速率的近似最优下界解;相比无能量协作机制而言,建立的能量协作传输机制将多播簇传输速率提升45%以上,增强了网络传输鲁棒性.The cluster heads(CHs) will face the contradiction between the lack of available energy and the demand of high energy consumption in energy harvesting-supported device-to-device multicast communications(EHD2MD).Wireless power transfer(WPT) technology is a possible way to address the above contradiction.The members of a device-to-device(D2D) multicast cluster can transfer part of their available energy to the CH by WPT and jointly undertake contents unloading.As a result,the transmission robustness of the multicast cluster can be improved.Therefore,a transmission scheme with energy cooperation(EC) is designed on the premise of cellular spectrum reusing.The EC scheme designs elaborately the energy harvesting,energy cooperation and data transmission of the spectrum reusing process.To realize the EC scheme,this work is to maximize the transmission rate of a multicast cluster and give the joint optimal solution of multi-domain resources including spectrum resource allocation,cooperative time factor planning,and power control.The rate maximization problem is a typical non-convex mixed integer non-linear programming(non-convex MINLP) problem.To investigate the performance of EH-D2MD communication scenario,a convex approximate lower-bound algorithm is proposed,which can transfer the non-convex problem into convex MINLP and can give a joint solution.Simulation results show that the proposed algorithm obtains a lower-bound solution of the rate maximization problem in comparison with the exhausted searching method.Furthermore,compared with the scheme without energy cooperation,the established EC transmission scheme can increase the transmission rate of D2MD by more than 45% and enhance the robustness of EH-D2MD.

关 键 词：能量采集 D2D多播通信 能量协作通信 凸近似方案 

分 类 号：TN929.5[电子电信—通信与信息系统]