Patent ID: 8644224

Claim:
A mobile communication method by which a mobile station communicates with a radio base station by using a primary carrier and one or a plurality of secondary carriers having different carrier frequencies, wherein a serving cell is present in each of the primary carrier and the secondary carrier, the method comprising: a step A of transmitting, by the radio base station, measurement control information including a carrier to be measured and a reporting condition, to the mobile station; and a step B of transmitting, by the mobile station, a measurement report including a measurement result of the carrier to be measured, to the radio base station, when the reporting condition is satisfied, wherein in the step B, when a measurement value of a radio quality in a non-serving cell of the secondary carrier within the carrier to be measured is larger than a sum of a measurement value of a radio quality in a serving cell of the secondary carrier within the carrier to be measured and a predetermined offset value for a predetermined period, the mobile station determines that the reporting condition is satisfied.