Page 22 - Digital solutions for integrated city management and use cases: A U4SSC deliverable on city platforms

2 Performance: refers to the ability to handle a large number of devices, services and processes
efficiently.
3 Scalability: pertains to the ability to increase processing, interconnection and storage capacities
without needing to change the architecture.

4 Robustness and resilience: refer to the capability to continue operation even while facing
problems.
5 Security: involves guaranteeing security, integrity and reliability.

6 Extensibility: refers to adaptability to meet new needs.

3.1 Technological architecture of a city platform

City platforms are mainly based on international and national standards, such as ITU-T Y.4201, ISO/
IEC 24039, UNE 178104: 2017, DIN 91357-2017, and FIWARE. These standards have an architecture
based on layers in common, where the different capacities planned for a City Platform are grouped
together.

In general, the layers (although abiding by different nomenclatures depending on the standard)
are commonly the following:

1 Acquisition and Integration of data from information systems and IoT devices

This layer concentrates the functionality that allows the integration of diverse data sources from
different data collection systems. It is capable of integrating information from multiple sources: IoT
sensors deployed by the city (traffic lights, street lights, park irrigation, temperature, capacity, etc.);
information systems and external infrastructure; citizen devices (mobile APP) and social networks.

It is recommended that the data acquisition and formatting processes that collect field information
be carried out using standard and open protocols, which results in scalability and ease in semantic
abstraction protocols .
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This layer also supplies information to the data/knowledge functions independently from the devices
and formats the acquired data according to semantic processing. The acquisition/interconnection
functions are independent of network information and control.

2 Information processing and data analysis

This layer, also known as Data/knowledge layer, includes the elements of information treatment,
management, and exploitation. It includes the data repository that centralizes all data information,
real-time repository, Big Data repository, and Geographic Information System (GIS).

10 U4SSC: Digital solutions for integrated city management & use cases