250 ITU‐T's Technical Reports and Specifications accomplished independently. To prevent the leak and certify the published privacy data, anonymization infrastructure is indispensable for the future SSC applications including big‐data business. Figure 30 – Proposed protocol for the secondary use of various data 2.2.4 Augmented reality The potential of the use of augmented reality is infinite and they are still discovering many of their applications, for example, new augmented reality technology takes designs of proposed building developments and transposed them onto a smartphone or similar device. Using this, the inhabitants of a smart sustainable city can visualize how the final result would be to make informed planning decisions. Police services can use viewers of augmented reality with facial recognition for identification of criminals, and tourists can be guided and can also display information of the attractions or monuments of the city, etc. 2.3 Terminals, Sensing and multi‐device layer This section contains specifications for the users layer (Figure 5) and sensing layers (Figures 4 and 5). 2.3.1 Terminals (Gateways) The network is not complete without interconnection equipment on the one hand and on the other with their ends that reach users and things. Sensors are one of the most important types of terminals, which are discussed in the next section. 2.3.2 Sensor They consist of sensors of resources, security, lighting, presence, weather, transportation, movement or position installed on the physical infrastructure of the SSC. These devices make it possible to meet and study the phenomena of public and private interest such as climate, congestion