Mobile station and method for mobile communication system

A mobile station comprising:ncircuitry configured tonmeasure radio qualities for a serving cell and a candidate switching target cell;determine whether the radio quality of the serving cell is less than a reference quality, the reference quality having been corresponded with a predetermined throughput in advance;when the radio quality of the serving cell is less than the reference quality, determine whether the serving cell is to be switched to the candidate switching target cell by comparing the radio quality of the serving cell with the radio quality of the candidate switching target cell;transmit a first signal for requesting the switching of the serving cell; andreceive a second signal for instructing the switching of the serving cell from a network apparatus,wherein, when the state in which the radio quality of the candidate switching target cell is greater than or equal to the radio quality of the serving cell by the predetermined value is retained for the predetermined time period, the circuitry is configured to determine that the serving cell is not to be switched to the candidate switching target cell, andwherein, when the state in which the radio quality of the candidate switching target cell is greater than or equal to the radio quality of the serving cell by the predetermined value is not retained for the predetermined time period, the circuitry is configured to determine that the serving cell is not to be switched to the candidate switching target cell.

A method executed by a mobile station comprising:nmeasuring, by circuitry of the mobile station, radio qualities for a serving cell and a candidate switching target cell;determining, by the circuitry, whether the radio quality of the serving cell is less than a reference quality, the reference quality having been corresponded with a predetermined throughput in advance;when the radio quality of the serving cell is less than the reference quality, determining whether the serving cell is to be switched to the candidate switching target cell by comparing the radio quality of the serving cell with the radio quality of the candidate switching target cell;transmitting a first signal for requesting the switching of the serving cell; andreceiving a second signal for instructing the switching of the serving cell from a network apparatus,wherein, when a state in which the radio quality of the candidate switching target cell is greater than or equal to the radio quality of the serving cell by a predetermined value is retained for a predetermined time period, the step of determining whether the serving cell is to be switched includes determining that the serving cell is to be switched to the candidate switching target cell, andwherein, when the state in which the radio quality of the candidate switching target cell is greater than or equal to the radio quality of the serving cell by the predetermined value is not retained for the predetermined time period, the step of determining whether the serving cell is to be switched includes determining that the serving cell is not to be switched to the candidate switching target cell.