Information Freshness-Aware Task Offloading in Air-Ground Integrated Edge Computing Systems

Xianfu Chen, Celimuge Wu, Tao Chen, Zhi Liu, Honggang Zhang, Mehdi Bennis, Hang Liu, Yusheng Ji

Research output: Contribution to journalArticleScientificpeer-review

34 Citations (Scopus)


This paper investigates an air-ground integrated multi-access edge computing system, which is deployed by an infrastructure provider (InP). Under a business agreement with the InP, a third-party service provider provides computing services to the subscribed mobile users (MUs). MUs compete for the shared spectrum and computing resources over time to achieve their distinctive goals. From the perspective of an MU, we deliberately define the age of update to capture the staleness of information from refreshing computation outcomes. Given the system dynamics, we model the interactions among MUs as a stochastic game. In the Nash equilibrium without cooperation, each MU behaves in accordance with the local system states and conjectures. We can hence transform the stochastic game into a single-agent Markov decision process. As another major contribution, we develop an online deep reinforcement learning (RL) scheme that adopts two separate double deep Q-networks to approximate the Q-factor and the post-decision Q-factor, respectively. The deep RL scheme allows each MU to optimize the behaviours with unknown dynamic statistics. Numerical experiments show that our proposed scheme outperforms the baselines in terms of the average utility under various system conditions.
Original languageEnglish
Pages (from-to)243-258
Number of pages16
JournalIEEE Journal on Selected Areas in Communications
Issue number1
Early online date13 Nov 2021
Publication statusPublished - 1 Jan 2022
MoE publication typeA1 Journal article-refereed


  • Age of update
  • Multi-access edge computing
  • Multi-agent deep reinforcement learning
  • Stochastic games
  • Unmanned aerial vehicle


Dive into the research topics of 'Information Freshness-Aware Task Offloading in Air-Ground Integrated Edge Computing Systems'. Together they form a unique fingerprint.

Cite this