  This article presents the deployment and experimentation architecture of the
Aveiro Tech City Living Lab (ATCLL) in Aveiro, Portugal. This platform
comprises a large number of Internet-of-Things devices with communication,
sensing and computing capabilities. The communication infrastructure, built on
fiber and Millimeter-wave (mmWave) links, integrates a communication network
with radio terminals (WiFi, ITS-G5, C-V2X, 5G and LoRa(WAN)), multiprotocol,
spread throughout 44 connected points of access in the city. Additionally,
public transportation has also been equipped with communication and sensing
units. All these points combine and interconnect a set of sensors, such as
mobility (Radars, Lidars, video cameras) and environmental sensors. Combining
edge computing and cloud management to deploy the services and manage the
platform, and a data platform to gather and process the data, the living lab
supports a wide range of services and applications: IoT, intelligent
transportation systems and assisted driving, environmental monitoring,
emergency and safety, among others. This article describes the architecture,
implementation and deployment to make the overall platform to work and
integrate researchers and citizens. Moreover, it showcases some examples of the
performance metrics achieved in the city infrastructure, the data that can be
collected, visualized and used to build services and applications to the
cities, and, finally, different use cases in the mobility and safety scenarios.
