Horizontal Requirement Engineering in Integration of Multiple IoT Use Cases of City Platform as a Service

As deployment of IoT grows, potential and real conflicts and interference of IoT systems also grow. Many problems are potentially born in the requirement phase. However, the vertical nature of IoT deployment prevents identification of the challenges in the difficult in the early design phase. The author is engaged in a city-area IoT and open data project, and becomes aware that the necessity of systematic methodologies at the requirement phase. The author presents a 3-stage framework of requirement engineering of joint use cases of vertical IoT services.