SYSTEM AND METHOD FOR SPEED INDICATION THROUGH TRANSMIT POWER CONTROL COMMANDS

摘要

Speed indication device (100) for determining a speed indication signal (410) indicating a speed of a wireless mobile telecommunication device (14) relative to the speed indication device (100), wherein the speed indication device (100) determines the speed indication signal (410) from a sequence of transmit power control commands sent by the wireless mobile telecommunication device (14)to an access point (12) in a wireless telecommunication device (14) to an access point (12) in a wireless telecommunication network for controlling, in use, a transmit power of a radio signal transmitted by the access point (12) to the wireless mobile telecommunication device (14). If the relative speed is found to be above a threshold, the speed may be calculated using a measurement of the Doppler frequency.