METHOD FOR DETECTING A PORTABLE USER EQUIPMENT IN A PREDETERMINED ZONE, INSIDE OR OUTSIDE A VEHICLE, BY ULTRA HIGH FREQUENCY, ASSOCIATED DETECTION DEVICE AND USER EQUIPMENT

摘要

The subject of the present invention is a method for detecting a portable user equipment (SD) in a predetermined zone (ZD1, ZD2, ZD3), inside or outside a vehicle (V) by ultra-high-frequency with the aid of a detection device (10) on board the vehicle, said high-frequency communication, of Bluetooth Low Energy type, BLE, comprising two modes, a first so-called signalling mode, and a second so-called communication mode, the invention proposing that the first mode comprises the following steps: • positioning of the portable equipment at a predetermined and fixed distance from the detection device, • transmission of a signal (« ADVJND », « SCAN REQUEST ») by the detection device with a predetermined transmission power (P) on a channel (CH ₃₇), • as long as the detection device receives a response signal (« SCAN RESPONSE », « SCAN REQUEST ») from the portable equipment, then repetition of the transmission of the signal at the same transmission power on the other two channels (CH ₃₈, CH ₃₉), • if the response signal (« SCAN REQUEST ») has been received on each of the three channels (CH ₃₇, CH ₃₈, CH ₃₉), then decreasing of the transmission power of the signal (P) and repetition of the transmission of the signal (« ADV IND », « SCAN REQUEST ») for each channel (CH ₃₇, CH ₃₈, CH ₃₉), with said decreased transmission power, • if the detection device no longer receives a response signal, then the transmission power (P) is compared with a predetermined threshold transmission power (P T), and a correction (Δ) is applied to the transmission power (Pe) of the signals dispatched by the detection device during the second mode so as to detect the portable equipment in a predetermined zone.