USER TERMINAL ASSISTED OUT-OF-SYNCHRONIZATION DETECTION

摘要

A control module, a computer readable medium and a method for determining when a first base station (BS1) in a telecommunication network (20) is out of synch with the network (20), the network (20) including at least a second base station (BS2) and a user terminal (26) configured to receive signals from the first and second base stations (BS1, BS2). The method includes receiving in a control module (28) of the network (20) a measuring report from the user terminal (26), where the measuring report includes a first time of arrival (Ta1) of a first signal from the first base station (BS1) to the user terminal (26) and a second time of arrival (Ta2) of a second signal from the second base station (BS2) to the user terminal (26); receiving a maximum of a travel time difference (max(T1 - T2)) between (i) a first travel time (T 1) of the first signal from the first base station (BS 1) to the user terminal (26), and (ii) a second travel time (T2) of the second signal from the second base station (BS2) to the user terminal (26); determining a minimum of a difference starting time (min(T0 - T0')), which corresponds to a time offset between a starting time (T0) of the first signal and a starting time (T0') of the second signal, as a difference between (i) a difference between the first time of arrival (Ta1) and the second time of arrival (Ta2), and (ii) the maximum travel time difference (max(T1 - T2)); comparing the determined minimum difference starting time (min(T0 - T0')) with a predetermined threshold; and identifying the pair of the first base station (BS1) and the second base station (BS2) as including one base station that lost the synch with the network, when the determined minimum difference starting time (min(T0-T0')) is larger than the predetermined threshold in the comparing step.