Analysis on Peak Age of Status Updates in Task-Oriented Machine- Type Communications

• Published in: IEEE transactions on wireless communications Vol. 23; no. 10; pp. 15555 - 15570
• Main Authors: Li, Yanlin, Qin, Xiaoqi, Dai, Jincheng, Song, Xianxin, Ma, Nan, Zhang, Ping
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-10-2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Age of information; Citizens; Computational modeling; Cost analysis; Edge computing; Energy consumption; Energy costs; Estimation error; green communications; Measurement; Optimization; Parallel processing; Performance measurement; Real time; Real-time systems; resource allocation; Servers; Situational awareness; tandem queues; Task analysis; Time measurement; Wireless communication; Wireless communication systems
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2024.3430903

The scope of the 6G wireless communication system is envisioned to expand beyond delivering data to humans and towards connecting machines that constantly upload computation-intensive status updates to obtain real-time situational awareness. Under dynamic environments, the amount of useful information contained in status updates degrades over time, which could be measured based on the concept of age of information. In this paper, we develop an analytical framework to investigate the temporal value of status updates, in terms of the peak age of information. Given the temporal dynamics of observed physical process, the procedure of transmission and computing is modeled as tandem queues for both parallel processing and series processing modes at the edge server. The obtained closed-form expressions explicitly characterize the coupling among information generation, transmission, and usage, which can be exploited as performance metrics for task-oriented resource optimization. The accuracy of our analysis is verified with simulation results. Based on the theoretical analysis, we formulate an optimization problem to simultaneously minimize the age of status updates and energy consumption for multiple devices. Numerical results reveal that the computation and transmission time could be traded off to obtain timely status updates at low energy cost.