基于流量整形的NR-V2X非周期业务增强型半持续调度机制  

Enhanced semi-persistent scheduling mechanism based on traffic shaping for aperiodic traffic in NR-V2X

作　　者：王致远 陈斌 邱佳慧[2] 张菊[1] 苏昭阳 刘留[1] WANG Zhiyuan;CHEN Bin;QIU Jiahui;ZHANG Ju;SU Zhaoyang;LIU Liu(School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,P.R.China;Intelligent Network&Innovation Center,China United Network Communications Group Co.,LTD,Beijing 100048,P.R.China)

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]中国联合网络通信集团有限公司智网创新中心,北京100048

出　　处：《重庆邮电大学学报（自然科学版）》2024年第5期868-878,共11页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金项目(61931001)。

摘　　要：针对新空口车联网(new radio vehicle to everything,NR-V2X)系统中半持续调度在非周期业务下效率低、不稳定的问题,提出一种基于流量整形的增强型半持续调度机制。以时隙作为调度单位,应对业务的可变分组长度;在传输中预留连续资源,解决业务到达间隔较大导致半持续调度出现的预留中断问题;针对业务到达间隔较小的情况,以动态组包方式和单次资源调度方式,充分利用预留资源并避免不必要的资源更换。仿真结果表明,提出的方案在200 vehicle/km的交通流量下,数据包接收率较半持续调度机制提升约9百分点,较动态调度机制提升约16百分点,有利于提升资源管理的有效性和保证传输的可靠性。Aiming at the inefficiency and instability of semi-persistent scheduling for aperiodic traffic in NR-V2X,we propose an enhanced semi-persistent scheduling mechanism based on traffic shaping.Firstly,the slot is proposed as the scheduling unit to cope with the variable packet size of the traffic.Secondly,it is proposed to reserve multiple contiguous resources in one transmission to solve the reservation break due to long packet arrival interval in semi-persistent scheduling.Finally,in the case of short packet arrival interval,dynamic packet combination and single resource scheduling are proposed to fully utilize the reserved resources and avoid unnecessary reselection.Simulation results demonstrate that the proposed scheme improves packet reception ratio by about 9%compared with semi-persistent scheduling and about 16%compared with dynamic scheduling at a traffic flow of 200 vehicles/km,which contributes to improving the effectiveness of resource management and ensuring the reliability of transmission.

关 键 词：NR-V2X 非周期业务 资源分配 半持续调度 流量整形 

分 类 号：TN929.5[电子电信—通信与信息系统]