Patent ID: 8451757

Claim:
A method for receiving a preamble signal from a base station of a second communication system by a mobile station in a first communication system, the method comprising: receiving, by the mobile station, measurement gap scheduling information for scheduling a measurement gap from a base station of the first communication system; if the preamble signal of the base station of the second communication system is not received during the measurement gap, changing the measurement gap by the mobile station, wherein a measurement gap interval is decreased according to the changed measurement gap; and receiving, by the mobile station, the preamble signal of the base station of the second communication system during the changed measurement gap, wherein the base station of the first communication system receives a cell ID (Identity) of the second communication system and assigns the measurement gap after an offset from a time the cell ID is received, the offset corresponding to a frame size, and the changed measurement gap is determined using the frame size.