METHOD TO ESTIMATE MULTIPLE ROUND TRIP DELAYS ATTACHED TO CELLULAR TERMINALS FROM A RACH SIGNAL RECEIVED WITHIN A DEDICATED TIME SLOT MULTIPLEXED ONTO AN UPLINK TRAFFIC MULTIPLEX FRAME

摘要

The method for estimating a propagation round trip delay, existing between a base station and a terminal, and comprised within a predetermined round trip delay range, comprises the following steps:;transmitting from the base station on a downlink a start order signal (30) to the terminal,;after reception by the terminal of the end of the start order signal, sending a signature signal from the terminal to the base station on a uplink,;receiving at the base station within a signature receiving time slot (28) the signature signal (34, 38, 42),;processing at the base station the received signature signal to provide a round trip delay information.;The processing step comprises a cyclic correlation step performed within a fixed correlation time window (54) by using a unique reference sequence (48).