Methode zur Abschätzung der mobilen Terminals zugeordneten Umlaufverzögerungszeiten von RACH Signalen, die in zugeordneten Zeitschlitzen empfangen wurden auf einen Aufwärtslink Multiplexverkehrsrahmen.

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).