Interoperability of IoT wireless technologies in ambient assisted living environments

With development of technologies and industry, our living becomes more comfortable. However, a problem of today's world is population aging. Over last decades the number of older people has been increasing. The goal of many researches is to enable elderly people to live independently. The ambient assisted living encompasses technical systems, infrastructures, and services to support elderly people in their daily routine and to allow an independent and safe lifestyle as long as possible. One of those projects is eWALL project. IoT is a concept that is used in these projects and it represents the connections between humans and smart objects that are part of this environments. In these kinds of smart environments, different technologies are used for communication. These technologies are: Wi-Fi, Bluetooth, Bluetooth Low Energy and ZigBee. The goal of this work is to show possible problems in coexistence of above mentioned technologies. Also, cognitive radio is considered as a solution for interference problem caused by coexistence of different technologies in home environment.