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A Scheduling Scheme for Minimizing Age Under Delay Tolerance in IoT Systems With Heterogeneous Traffic | IEEE Journals & Magazine | IEEE Xplore

A Scheduling Scheme for Minimizing Age Under Delay Tolerance in IoT Systems With Heterogeneous Traffic


Abstract:

To measure the freshness of information more accurately and satisfy the timeliness demands for a wide range of time-sensitive applications, Age of Information (AoI) becom...Show More

Abstract:

To measure the freshness of information more accurately and satisfy the timeliness demands for a wide range of time-sensitive applications, Age of Information (AoI) becomes a popular network performance metric. In this article, we investigate the optimization of real-time performance in an Internet of Things (IoT) system with heterogeneous traffic, where periodic traffic for control and random traffic for update coexist. Generally, the periodically arriving data used for control is strictly deadline sensitive, while the randomly arriving data used for updates has freshness requirements. Thus, we seek to develop a scheduling scheme that minimizes the long-term average AoI under the delay tolerance constraint, to meet the varying transmission timeliness requirements for different arrival models. The optimization problem is modeled as a constrained Markov decision process, and then it is decoupled into two classes of optimization subproblems for a single node by relaxing the hard constraint of channel resources with the Lagrange multiplier. On this basis, a multinode scheduling scheme consisting of a master policy and two subpolicies is designed. Specifically, two subpolicies are built for the two classes of optimization subproblems, respectively, with Lyapunov and linear programming methods. For the hard constraint, a master policy is designed by introducing deep reinforcement learning for scheduling opportunities allocation, and a truncated subpolicy is proposed based on one of the subpolicies. Numerical results show that the proposed scheme can obtain a smaller long-term average AoI compared to other advanced algorithms while satisfying the delay constraint.
Published in: IEEE Internet of Things Journal ( Volume: 11, Issue: 9, 01 May 2024)
Page(s): 16902 - 16914
Date of Publication: 16 February 2024

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