截止期限下的无线随机接入网络性能研究  

Analysis of Deadline-constrained Wireless Random Access Networks

作　　者：杨诚 张成辉 邹涵 YANG Cheng;ZHANG Chenghui;ZOU Han(School of Electronic&Information Engineering,Nanjing University of Information Science and Technology,Nanjing Jiangsu 210044,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044

出　　处：《通信技术》2024年第10期1043-1048,共6页Communications Technology

摘　　要：随着实时物联网场景需求的增加,无线数据的传输需要确定性的保障。因此,研究了在有截止期限约束下的无线随机接入的时效性和包接收情况。具体来说,首先考虑多用户时隙ALOHA,其中每个活跃用户在随机接入的信道上传输有截止期限的数据包,未能成功传输则被丢弃;其次建立数学模型研究截止期限下不同传输概率和重传机制对系统时效和包接收的影响。结果表明,引入重传机制和根据用户规模调整传输概率能够提高系统的包接收率和时效性。As the demand for real-time IoT scenarios increases,the transmission of wireless data requires deterministic guarantees.Therefore,this paper investigates the timeliness and packet reception of wireless random access with deadline constraints.Specifically,it first considers multi-user slotted ALOHA,in which each active user transmits packets with deadlines over random access channel,and packets that are not successfully transmitted are discarded.Then,the paper establishes a mathematical model to study the effects of different transmission probabilities and retransmission mechanisms on the timeliness and packet reception of the deadline-constrained system.The results reveal that the introducing of retransmission mechanism and the adjustment of transmission probability according to the user scale can improve the packet reception probability and timeliness of the system.

关 键 词：随机接入 时隙ALOHA 包接收率 截止期限 时效性 

分 类 号：TN92[电子电信—通信与信息系统]