Patent ID: 6163534
Filing Date: 2000-12-19
Classification: G01S,H04W

Abstract:
A method for determining the speed of a terminal equipment in a radio system using a time division multiple access method in which a signal is transmitted in a succession of time slots each of a given duration and the signal is received and sampled, the received sampled signal having a signal envelope with a mean strength, which method comprises measuring the mean strength of the signal envelope of the received sampled signal within a given time window, characterized in thatthe given time window has a duration that is at most half of the duration of a time slot,a parameter proportional to the mean strength of the signal envelope is formed during each time window,in each received time slot the parameter is measured by using at least two time windows, and a variation of the envelope is calculated by time slots on the basis of the parameter, to form a derived variation value,the derived variation value is averaged over several time slots to form an averaged variation value, andthe averaged variation value is compared with a calculated reference value, which comparison indicates the speed of the equipment.