A SENSOR A MOBILE USER TERMINAL AND A METHOD OF A SENSOR SENSING A MOBILE USER TERMINAL

摘要

A method is provided of a sensor sensing a mobile user terminal for cellular radio telecommunications� the user terminal being associated with any one of a plurality of networks� each network having a distinct carrier frequency band for radio signals. The method comprises: broadcasting a common signal at each of multiple carrier frequency bands; the user terminal receiving the signal in the associated carrier frequency band of its network; the user terminal checking information in the received signal� and upon determining that the information is acceptable to allow connection to the sensor� the user terminal acknowledging to the sensor its receipt of the signal.