Acknowledgements These Technical Specifications were researched and authored by Ziqin Sang (Fiberhome Technologies Group), Hongqing Ding (Fiberhome Technologies Group), Masayuki Higashi (Japan), Jiro Nakamura (NTT), Minako Hara (NTT), Takafumi Hashitani (Fujitsu), Junnosuke Sugiura (Fujitsu), Claudio Di Carlo (Italy), Paola Girdinio (Genoa University), Raffaele Bolla (Genoa University), Paolo Gemma (Huawei), Dewei Xu (Fiberhome Technologies Group), Jia Guo (Fiberhome Technologies Group), Pernilla Bergmark (Ericsson), Lelio Digeronimo (Avina), Luis Castiella (San Andrés University), Mike Wood (Telstra), Jack Rowley (GSMA), Christer Tornevik (Ericsson) and Christophe Grangeat (Alcatel‐Lucent) . The authors wish to extend their gratitude to Ramy Ahmed Fathy (NTRA, Egypt), Michael Mulquin (IS Communications), Angelica V. Ospina (University of Manchester), Mythili Menon (University of Geneva) for their valuable inputs and support. 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 Specifications 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.