With the arrival of 5G, a lot of communicating devices will be spread in our daily life environment. As indicated by Cisco's annual report [1], the number of overall connected devices will reach 29.3 billion by 2023 in comparison to 18.4 billion in 2018, with a 10% annual growth. In all these devices, smartphones will represent around a fourth of all these devices, among personal computers, laptops, TVs, tablets, M2M devices, etc.