Patent ID: 7519401

Claim:
A method of operating user equipment (UE) in a cellular telecommunications system, the method comprising: a controller causing the UE to begin operating in a power saving state by determining that a first set of predefined criteria have been satisfied; and the controller causing the UE to leave the power saving state by determining that a second set of predefined criteria have been satisfied, wherein determining that the first set of predefined criteria have been satisfied includes: making a plurality of signal quality measurements of a signal received from a serving cell in the telecommunications system; making a plurality of signal quality measurements of a signal received from one or more neighboring cells in the telecommunications system; determining a first trend line from the signal quality measurements of the serving cell in the telecommunications system; determining a second trend line from the signal quality measurements of the one or more neighboring cells in the telecommunications system; and determining that the first set of predefined criteria have been satisfied if the first and second trend lines are not converging.