基于S-SPS机制的C-V2X干扰建模及性能分析方法  

C-V2X Interference Model and Performance Analysis Based on S-SPS Mechanism

作　　者：聂佳幸 谭国平 周思源 NIE Jia-xing;TAN Guo-ping;ZHOU Si-yuan(School of Computer and Information,Hohai University,Nanjing 211100,China;Jiangsu Intelligent Transportation and Intelligent Driving Research Institute,Nanjing 210019,China)

机构地区：[1]河海大学计算机与信息学院,南京211100 [2]江苏智能交通及智能驾驶研究院,南京210019

出　　处：《小型微型计算机系统》2022年第6期1136-1140,共5页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(61701168,61832005)资助;中国博士后科研基金项目(2019M651546)资助;江苏省交通运输厅重大科技项目(2019Z07)资助.

摘　　要：基于感知的半静态调度(S-SPS,Sensing based Semi-Persistent Scheduling)是C-V2X车联网协议中车车直连通信的信道资源选择机制,能够有效避免通信过程中数据包的碰撞问题.但是S-SPS不能完全避免数据包碰撞,目前缺乏对数据包碰撞产生干扰的建模研究.针对此问题,构建了通过S-SPS进行信道资源选择的车辆通信网络模型.然后,统计在此场景下其他车辆与发射车辆选择同一资源而产生干扰的概率,并通过曲线拟合得到其服从双指数分布.最后,利用得到的干扰分布和随机几何模型推导出车辆信干噪比的表达式,从而得到工作在此模式下的车辆通信网络的数据包成功接收率.实验仿真结果验证了干扰建模和推导公式的正确性.Sensing-based Semi-Persistent Scheduling(S-SPS)is a channel resource selection mechanism for vehicle-to-vehicle direct communication in the C-V2X Internet of Vehicles protocol,which can effectively avoid the collision of data packets in the communication process.However,S-SPS can′t completely avoid packet collision,and there is a lack of research on modeling interference to packet collision at present.To solve this problem,a vehicle communication network model with channel resource selection by S-SPS is constructed.Then,we count the probability of interference caused by other vehicles and the launch vehicle selecting the same resource in this scenario,and the probability of selecting same resource obeys the double exponential distribution through curve fitting.Finally,the expression of the vehicle′s signal to interference plus noise ratio is derived through the random geometric model,so as to obtain the successful reception rate of data packets of the vehicle communication network working in this mode.The experimental simulation results verify the correctness of the interference modeling and derivation formula.

关 键 词：车联网 基于感知的半静态调度 数据包成功接收率 随机几何 信干噪比 

分 类 号：TN929[电子电信—通信与信息系统]