AUTHOR=Dahrouj Hayssam , Douik Ahmed , El-Hajjar Mohammed , Kaneko Megumi , Li Yonghui , Ngo Duy T. , Saad Mohamed , Shen Kaiming , Zhang Jun TITLE=Editorial: Resource Allocation in Cloud-Radio Access Networks and Fog-Radio Access Networks for B5G Systems JOURNAL=Frontiers in Communications and Networks VOLUME=2 YEAR=2021 URL=https://www.frontiersin.org/journals/communications-and-networks/articles/10.3389/frcmn.2021.793084 DOI=10.3389/frcmn.2021.793084 ISSN=2673-530X