Patent ID: 8630674

Claim:
A method of operating a mobile communication terminal in a cellular network, said method comprising: monitoring reception power levels between the mobile communication terminal and a number of base stations of the cellular network by a control unit of the mobile communication terminal at a predefined reception power level monitoring rate for each base station, simultaneously intermittently monitoring Timing Offset Information (TOI) values for a number of base stations by the control unit, monitoring a drift of the TOI values for at least two of the base stations and a significant motion of the mobile communication terminal is deemed detected if at least one of the TOI values indicates a drift equal to or exceeding a given timing drift threshold, and reducing the predefined reception power level monitoring rate to a reduced reception power level monitoring rate for at least a number of the base stations as long as the motion of the mobile communication terminal is not a significant motion, wherein a drift of reception power levels for at least a number of the base stations is also monitored and a significant motion of the mobile communication terminal is also deemed detected if at least one of the reception power levels shows a drift equal to or exceeding a given power drift threshold.