Acknowledgements This Technical Report was researched and authored by Jie Chang (China Telecom), Lei Gu (China Telecom), Wei Liu (Shanghai Library), Kanae Matsui (Keio University), Hiroaki Nishi (Keio University) and Cuijuan Xia (Shanghai Library). The authors wish to extend their gratitude to Ramy Ahmed (NTRA Egypt), Takafumi Hashitani (Fujitsu), Michael Mulquin (IS Communications), Ziqin Sang (Fiberhome Technologies Group), Mythili Menon (University of Geneva) and Junnosuke Sugiura (Fujitsu) for their valuable inputs and support. Authors and contributors are listed in alphabetical order. The authors acknowledge the guidance and support from all the members of the ITU‐T Focus Group on Smart Sustainable Cities (FG‐SSC) Management Team. Additional information and materials relating to this Technical Report can be found at: www.itu.int/itu‐t/climatechange. If you would like to provide any additional information, please contact Cristina Bueti (ITU) at tsbsg5@itu.int.