基于CoMP的5G免许可频段通信协调调度  

CoMP based coordinated scheduling for 5G unlicensed frequency band communication

作　　者：杨可心 陈琪美 江昊[1] 周浩[1] YANG Kexin;CHEN Qimei;JIANG Hao;ZHOU Hao(School of Electronic Information,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电子信息学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2023年第7期879-884,共6页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:61801333)。

摘　　要：为了应对未来5G系统中不断增加的无线设备带来的频谱稀缺、干扰严重、系统性能骤减等问题,提出一种基于协作多点传输(coordinated multi-point,CoMP)机制的免许可频段新空口(new radio-unlicensed,NR-U)协调调度方案。通过引入基于空间复用的先听后说(listen-before-talk,LBT)机制,实现免许可频段内NR-U与WiFi系统的和谐共存。此外,针对多个NR-U基站(base station,BS)在免许可频段的同信道干扰,设计了一个用户调度和波束协调的联合优化问题,采用分式规划和整数替换方法对其进行简化,并提出了交替方向乘子法和块坐标更新(alternating direction method of multipliers and block coordinate update,ADMM-BCU)融合算法来找到次优解,最终实现免许可频段内NR-U BS之间的协调传输。仿真结果证明,所提出的协调调度方案能够有效提升系统性能。To deal with the problems of spectrum scarcity,interference severity and performance deterioration brought by the exponentially increasing wireless devices in future 5G system,a coordinated multi-point(CoMP)transmission based new radio-unlicensed(NR-U)coordinated scheduling scheme is proposed.A listen-beforetalk(LBT)mechanism based on spatial reuse is introduced to ensure the harmonious coexistence of NR-U and the incumbent WiFi systems in unlicensed frequency band.Furthermore,in order to handle the co-channel interference among multiple NR-U base stations(BS)in the unlicensed frequency band,a joint optimization problem of user selection and beamforming coordination is designed.Fractional programming and integer replacement methods are adopted to simplify the original problem.An alternating direction method of multipliers and block coordinate update(ADMM-BCU)fusion algorithm is proposed to find the sub-optimal solution.Finally,coordinated transmission among 5G NR-U BS in the unlicensed band can be achieved.Simulation results show that the proposed coordinated scheduling scheme can effectively improve system performance.

关 键 词：5G NR-U 免许可频段 空间复用 COMP 

分 类 号：TN925[电子电信—通信与信息系统]