Use Cases

One of RERUM’s first activities will be to define, in detail, the envisaged use-cases that are of major interest for the participating Smart Cities. Although there is quite large number of potential use-cases for Smart City applications, the scope of RERUM is to choose a few applications/use-cases, leveraging the combined expertise of the consortium. Such applications will be developed within the project and used to evaluate the system’s performance in proof-of-concept field trials. RERUM is considering four use-cases (UCs), two indoor and two outdoor ones:

UC-O1. Outdoor: Smart transportation.  The goal of this use-case is to use a heterogeneous network of various sensors and smart objects in order to perform real time traffic estimation in the cities. To do so, both fixed and mobile sensors will be deployed. The first will be placed in traffic lights and lamp posts, while the latter will be placed in city vehicles (e.g. on the Tarragona buses which are already localized by GPS). Citizens and tourists will also be able to use their mobile phones (with a RERUM mobile application installed) contributing to the participatory sensing framework.

You can see a live demo of the smart transportation use case for Heraklion, Greece here.

UC-O2. Outdoor: Environmental monitoring. The goal is to perform measurements for pollution in city environments. The focus will be on outdoor environmental measurements for temperature, humidity and air pollution (measuring i.e. Carbon monoxide –CO, Nitrogen Dioxide -NO2, Ozone – O3). Note that Tarragona is already using the SIRUSA and EMATSA City Council  Agencies’ sensors to obtain such information,  similarly more fixed sensors, where necessary, will placed in appropriate locations (in parks, squares, congested areas, etc.). Mobile sensors on vehicles will be also utilized. For radio pollution, the target is to measure the ElectroMagnetic field (EMF) radiation. Doing this in a non-intrusive way, deployed fixed and mobile devices can utilize their wireless interfaces to take radio pollution measurements. Therefore, we are not introducing extra devices only for measuring radio pollution.

UC-I1. Indoor: Home energy management. The focus of this use-case is to monitor the energy consumption of several devices in a home or public building and to utilize the RERUM framework to control them in order to reduce their energy consumption. In this respect, hardware sensors will be attached to high powered devices and to lights, aiming to monitor the consumption and to avoid wasteful use.

UC-I2. Indoor: Comfort quality monitoring. This use-case encompasses several characteristics similar to the ones of UC-O2. The target is to measure the indoor air quality and to detect smoke and fire, as well as to measure the temperature and the humidity inside buildings. Such measurements are crucial for several civic buildings, i.e. museums, galleries, administrative computer rooms, etc. The indoor environment and the integration of both wireless and wired sensors differentiate this use-case from the UC-O2.


One of RERUM’s most important activities is the execution of trials in two large-scale real-world environments in the two participating Smart Cities. These will not be two identical trials duplicating work in similar settings. The novel idea in RERUM is to split the trials in two phases. During each of the two phases, the cities will execute different use-cases (both indoors and outdoors). For example, at phase 1 Heraklion will execute UC-O1 and UC-I1 while Tarragona will execute UC-O2 and UC-I2 and the reverse in phase 2 (see figure). The reason for that is that at the end of phase 1, each trial will provide the other trial with information regarding the early results of the execution of its use-cases. Then, the trials will use the experience/pitfalls of the other trial in order to improve the deployment and execution parameters of the respective use-cases, adapt the system and enhance it for achieving optimum results.


Already, the Municipality of Heraklion has a Wireless Network deployed in the city, consisting of a large number of wireless Access Points, covering central squares, main roads and distant areas. FORTH has deployed in the city of Heraklion a multi-radio metropolitan-area mesh network that will also be used to connect several types of smart objects to perform Electro Magnetic Fields (EMF) measurements for radio pollution. CYTA Hellas has a large optical network infrastructure deployed in the city of Heraklion. All these network infrastructures will be used in the trials as backbone technologies for the interconnection of the smart objects. Similarly, the city of Tarragona has also deployed a Wireless Network throughout the city to provide network access to the citizens. This network will also be part of the backbone communication technology used in the trials. Likewise the sensor nodes of the Tarragona EMATSA and SIRUSA agencies measuring O2, humidity, pressure, gas flow, particles, CO, CO2, NO, NO2, etc. can be leveraged. The experience of Zolertia in developing smart object hardware and deploying smart environments will be an asset for the project mitigating any possible risks that these types of real-life trials usually face.