Minimizing AoI in resource-constrained multi-source relaying systems with stochastic arrivals
Zakeri, Abolfazl; Moltafet, Mohammad; Leinonen, Markus; Codreanu, Marian (2022-02-02)
Zakeri, A., Moltafet, M., Leinonen, M., & Codreanu, M. (2021). Minimizing AoI in resource-constrained multi-source relaying systems with stochastic arrivals. 2021 IEEE Global Communications Conference (GLOBECOM), 1–6. https://doi.org/10.1109/GLOBECOM46510.2021.9685946
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https://urn.fi/URN:NBN:fi-fe2022030321778
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Abstract
We consider a multi-source relaying system where the sources independently and randomly generate status update packets which are sent to the destination with the aid of a buffer-aided relay through unreliable links. We formulate a stochastic optimization problem aiming to minimize the sum average age of information (AAoI) of sources under per-slot transmission capacity constraints and a long-run average resource constraint. To solve the problem, we recast it as a constrained Markov decision process (CMDP) problem and adopt the Lagrangian method. We analyze the structure of an optimal policy for the resulting MDP problem that possesses a switching-type structure. We propose an algorithm that obtains a stationary deterministic near-optimal policy, establishing a benchmark for the system. Simulation results show the effectiveness of our algorithm compared to benchmark algorithms.
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