基于时隙预订的随机接入网络的时效性  

Timeliness of Random Access Networks Based on Time Slot Reservation

作　　者：石常龙 李亮 马文丽 SHI Chang-long;LI Liang;MA Wen-li(School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 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：《中国电子科学研究院学报》2025年第1期56-63,共8页Journal of China Academy of Electronics and Information Technology

摘　　要：针对物联网中大规模设备接入可能导致的传输拥挤与碰撞的情况,文中研究了一种以信息新鲜度为要求的基于时隙预订的随机接入方案,利用信息年龄(Age of Information,AoI)衡量信息新鲜度。该方案以帧预订的方式动态调度大量设备有序地接入无线信道,将数据传输至公共接入点,实现更低的平均AoI。将帧划分为预订和传输两阶段,设备通过随机接入预订阶段占用传输阶段的对应时隙,并在传输阶段进行确定性传输。根据预订分配方式不同,分为固定帧长和动态帧长两种情况,推导出对应平均AoI的表达式,分析该方案中接入概率、帧长等参数对平均AoI的影响。结果验证了理论分析的正确性,并且表明该方案优于时隙Aloha。To address the situation of transmission congestion and collision that maybe caused by largescale device access in IoT,the paper investigates a time slot reservation-based random access scheme with information freshness as a requirement,which utilizes Age of Information(AoI)to measure information freshness.The scheme dynamically schedules a large number of devices to access the wireless channel in an orderly manner by means of frame reservation,and transmits the data to the public access point to achieve a lower average AoI.Specifically,the frame is divided into two phases,reservation and transmission.The device occupies the corresponding time slot in the transmission phase through the random access reservation phase,and transmits deterministically in the transmission phase.According to the different ways of reservation allocation,it is divided into two cases,fixed frame length and dynamic frame length.The expression of the corresponding average AoI is derived to analyze the influence of parameters such as access probability and frame length on the average AoI in this scheme.The results verify the correctness of the theoretical analysis and show that this scheme is superior to slotted Aloha.

关 键 词：信息年龄 信息新鲜度 时隙预订 随机接入 

分 类 号：TN92[电子电信—通信与信息系统]