# Key Technologies for 6G-Enabled Smart Sustainable City
## 3 Standardization of Smart Sustainable City
### Standardization of Candidate ICT Technologies for Smart Sustainable City  
For smart cities, ICT technologies such as AI, edge computing, and IoT are being employed in various sectors. To ensure seamless interoperability between ICT devices, the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) is establishing standards that specify the requirements, frameworks, operations, and management systems for ICT technologies, enabling the development of advanced wireless networks. Table 4 presents the representative standards of the candidate ICT technologies for SSC.  
\begin{table}
\begin{tabular}{c c} \hline \hline
**6G Technology** & **Main Contents** \\ \hline \multirow{4}{*}{Cloud Computing} & [ITU-T Y.3531] provides cloud computing requirements for machine learning as a service, which addresses requirements from use cases [20]; \\  & [ITU-T Y.3532] provides an overview of cloud-native applications and addresses functional requirements of platform as a service for cloud-native applications via various use cases [21]. \\ \hline \multirow{4}{*}{Edge Computing} & [ITU-T Y.3123] specifies the framework of edge computing capability exposure for IMT-2020 networks and beyond [22]: \\  & [ITU-T Y.3137] specifies the technical requirements for supporting application addressing in edge computing for future networks including IMT-2020, and also proposes new requirements towards fixed mobile convergence architecture for future networks [23]. \\ \hline \hline \end{tabular}
\end{table}
Table 4: Candidate ICT technologies for SSC.  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Maturity Level** & **Contents** \\ \hline \hline
1 & Have a clear roadmap or strategic plan for ICT-enabled SSC development. \\ \hline \multirow{2}{*}{2} & Align SSC initiatives with the city’s SSC strategy to support operations and activities for SSC development. \\ \hline \multirow{2}{*}{3} & Deploy specific SSC initiatives and provide SSC services based on ICT infrastructures. \\ \hline \multirow{2}{*}{4} & Integrate systems and data to provide SSC services (Advanced technologies such as IoT, cloud computing, and AI can be applied). \\ \hline \multirow{2}{*}{5} & Improve the efficiency of the effectiveness to keep contributing to the long-term SSC vision of the city. \\ \hline \hline \end{tabular}
\end{table}
Table 3: Maturity levels of the ICT infrastructure.  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Dimension** & **Main Topics** \\ \hline \multirow{3}{*}{Economic} & ICT infrastructure, Innovation, Employment, Trade (e-Commerce and export/import), Productivity, Physical infrastructure (water supply, electricity, health infrastructure, transport, road infrastructure, buildings and urban planning and public space), Public sector. \\ \hline \multirow{2}{*}{Environmental} & Air quality, Water and sanitation, Noise, Environmental quality, Biodiversity, Energy. \\ \hline \multirow{2}{*}{Social} & Education, Health, Safety (disaster relief, emergency, public safety and ICT), Housing, Culture, Social inclusion. \\ \hline \hline \end{tabular}
\end{table}
Table 2: Main topics of the three maturity dimensions.