Media type: E-Article Title: Cooperative Multigroup Broadcast 360° Video Delivery Network: A Hierarchical Federated Deep Reinforcement Learning Approach Contributor: Hu, Fenghe; Deng, Yansha; Aghvami, A. Hamid imprint: Institute of Electrical and Electronics Engineers (IEEE), 2022 Published in: IEEE Transactions on Wireless Communications Language: Not determined DOI: 10.1109/twc.2021.3126147 ISSN: 1536-1276; 1558-2248 Origination: Footnote: