Distributed Reinforcement Learning for Age of Information Minimization in Real-Time IoT Systems

Sihua Wang, Mingzhe Chen, Zhaohui Yang, Changchuan Yin, Walid Saad, Shuguang Robert Cui, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, the problem of minimizing the weighted sum of age of information (AoI) and total energy consumption of Internet of Things (IoT) devices is studied. In the considered model, each IoT device monitors a physical process that follows nonlinear dynamics. As the dynamics of the physical process vary over time, each device should find an optimal sampling frequency to sample the real-time dynamics of the physical system and send sampled information to a base station (BS). Due to limited wireless resources, the BS can only select a subset of devices to transmit their sampled information. Thus, edge devices can cooperatively sample their monitored dynamics based on the local observations and the BS will collect the sampled information from the devices immediately, hence avoiding the additional time and energy used for sampling and information transmission. To this end, it is necessary to jointly optimize the sampling policy of each device and the device selection scheme of the BS so as to accurately monitor the dynamics of the physical process using minimum energy. This problem is formulated as an optimization problem whose goal is to minimize the weighted sum of AoI cost and energy consumption. To solve this problem, we propose a novel distributed reinforcement learning (RL) approach for the sampling policy optimization. The proposed algorithm enables edge devices to cooperatively find the global optimal sampling policy using their own local observations. Given the sampling policy, the device selection scheme can be optimized. Simulations with real data of PM 2.5 pollution show that the proposed algorithm can reduce the sum of AoI by up to 17.8% and 33.9%, respectively, and the total energy consumption by up to 13.2% and 35.1%, respectively, compared to a conventional deep Q network method and a uniform sampling policy.

Original languageEnglish (US)
JournalIEEE Journal on Selected Topics in Signal Processing
DOIs
StateAccepted/In press - 2022

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Electrical and Electronic Engineering

Keywords

  • Energy consumption
  • Internet of Things
  • Monitoring
  • Nonlinear dynamical systems
  • Optimization
  • Real-time systems
  • Vehicle dynamics

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