Editorial: 5G-and-Beyond Communications for Smart Cities: Networks, Systems and Applications

School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, China, School of Engineering, Computer and Mathematical Sciences, Auckland University of Technology, Auckland, New Zealand, School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu, China, College of Information Engineering (College of Artificial Intelligence), Yangzhou University, Yangzhou, China, School of Computer Science and Electronic Engineering, University of Essex, Colchester, United Kingdom, Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ, United States, Department of Electronics and Communication Engineering, Institute of Information Technology (IIIT-Delhi), New Delhi, India, Department of Computer and Communication Systems Engineering, Putra Malaysia University, Selangor Darul Ehsan, Malaysia