https://jjcit.org/paper/284 10.5455/jjcit.71-1767004702 Tarek Amine Haddad Federated learning,Deep reinforcement learning,Collaborative learning,Distributed intelligence,Scalability,Adaptive aggregation 431 103 29-Dec.-2025 8-Feb.-2026 10-Feb.-2026 Federated Learning enables collaborative model training without sharing raw data, while Deep Reinforcement Learning provides powerful mechanisms for sequential decision-making. However, their integration suffers from limited scalability, sensitivity to non-IID data and unstable convergence in distributed environments. This paper proposes a Scalable Federated Deep Reinforcement Learning (SFDRL) architecture in which distributed agents learn local policies and periodically contribute to a global model via an adaptive, performance-aware aggregation strategy. Unlike conventional FedRL methods that rely on uniform averaging, SFDRL weights local updates according to their learning effectiveness, resulting in faster convergence and improved stability under heterogeneous data distributions. In addition, a selective communication mechanism is introduced to reduce communication overhead by up to 28% and 64% compared with FedAvg and FedRL, respectively. Extensive experiments demonstrate that SFDRL outperforms compared methods, achieving higher cumulative rewards, reduced variance during training and improved scalability in large-scale distributed settings. These results confirm the suitability of SFDRL for practical deployment in distributed intelligent systems.