NOMA-MEC状态更新系统信息年龄性能分析  

The Age of Information Performance Analysis in NOMA-MEC Status Update Systems

作　　者：刘磊 强静州 张雪薇 江帆 王军选 LIU Lei;QIANG Jingzhou;ZHANG Xuewei;JIANG Fan;WANG Junxuan(School of Communication and Information Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710121,China)

机构地区：[1]西安邮电大学通信与信息工程学院,西安710121

出　　处：《北京邮电大学学报》2025年第1期120-126,共7页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(62201456,62101442,62071377);陕西省重点研发计划项目(2023-YBGY-036);陕西省自然科学基础研究计划项目(2023-JC-YB-514)。

摘　　要：为了刻画基于非正交多址接入(NOMA)的移动边缘计算(MEC)状态更新系统的信息新鲜度,研究了用户将状态更新信息放置于本地计算与卸载至边缘计算两种场景下的信息年龄(AoI)。首先,利用排队论对状态更新信息的传输过程和计算过程进行队列建模。其次,分析了取决于NOMA无线传输质量的传输队列服务速率,并在传输队列与计算队列相互关联的条件下推导得出了系统平均AoI的解析表达式。蒙特卡洛仿真验证了所得理论分析结果的有效性。结果表明,相较于正交多址接入,在服务器计算速率配置较高的情况下使用NOMA-MEC可更为显著地改善系统AoI性能。此外,仿真对比结果展示了服务器计算速率、状态更新信息尺寸和用户传输功率等参数对系统AoI性能的影响。In order to characterize the information freshness of the mobile edge computing(MEC)state update system based on non-orthogonal multiple access(NOMA),the information age(AoI)of users in two scenarios was studied.First queuing theory is utilized to mimic the transmission and computation processes of status updates information.After analysis of the transmission queue's service rate that hinges on the quality of NOMA transmission,closed-form average AoI is derived for local and edge computing schemes.The validity of the theoretical analysis results is verified through Monte Carlo simulations.The simulation results that,compared to orthogonal multiple access,the system AoI performance can be enhanced more dramatically by applying NOMA-MEC with a higher server computation rate.In addition,the effects of the system parameters,such as server computation rate,status update information size,and transmission power,on the AoI performance are demonstrated by the simulation results.

关 键 词：非正交多址接入 移动边缘计算 信息年龄 状态更新系统 

分 类 号：TN914.5[电子电信—通信与信息系统]