Leveraging Digital Cousins for Ensemble Q-Learning in Large-Scale Wireless Networks

Optimizing large-scale wireless networks, including optimal resource management, power allocation, and throughput maximization, is inherently challenging due to their non-observable system dynamics and heterogeneous and complex nature. Herein, a novel ensemble
$Q$
-learning algorithm that addresses the performance and complexity challenges of the traditional
$Q$
-learning algorithm for optimizing wireless networks is presented. Ensemble learning with synthetic Markov Decision Processes is tailored to wireless networks via new models for approximating large state-space observable wireless networks. In particular,
digital cousins
are proposed as an extension of the traditional digital twin concept wherein multiple
$Q$
-learning algorithms on multiple synthetic Markovian environments are run in parallel and their outputs are fused into a single
$Q$
-function. Convergence analyses of key statistics and
$Q$
-functions and derivations of upper bounds on the estimation bias and variance are provided. Numerical results across a variety of real-world wireless networks show that the proposed algorithm can achieve up to 50% less average policy error with up to 40% less runtime complexity than the state-of-the-art reinforcement learning algorithms. It is also shown that theoretical results properly predict trends in the experimental results.