UWBAND-BASED METHOD FOR ACTIVATING FUNCTIONS OF A VEHICLE USING A PORTABLE USER EQUIPMENT, ASSOCIATED SYSTEM AND APPARATUS FOR ACTIVATING FUNCTIONS

The invention consists of a method for activating a vehicle function (V) by a portable user equipment (P) via ultra wide band-UWB-communication, said device comprising a plurality of transceivers (ER1, ER2, ER3, ER4), the vehicle function is activated depending on the position of the portable equipment relative to a boundary (F) between two authorized areas, namely an inner area (Z2) inside the vehicle and an outer area (Z1) outside the vehicle, the activation method comprising: a) determining the presence of the portable equipment in the authorized areas, b) if the portable equipment is located in an authorized area at a distance less than a predetermined distance from the boundary: i) determining that the portable equipment is present in a predetermined sub-area, which is previously associated with two types of transceivers of the plurality of transceivers, the two types being: a first type (ERi1), a second type (ERi2), and a third type (ERi3); the first type (ERi1) has at least one signal parameter represe