Communication system, mobile station apparatus, radio link state management method, and integrated circuit

A mobile station apparatus in a communication system comprising a base station apparatus and a mobile station apparatus which communicate with each other by aggregating a plurality of cells of different frequencies, wherein

• the mobile station apparatus
• configures linkage information indicating a cooperation relation between an uplink and a downlink for the cell and a timer for managing a state of the cell which have been notified from the base station apparatus, and
• simultaneously changes states of the uplink and the downlink of the cell, the timer for which has expired, based on the linkage information configured by the base station apparatus.

A radio link state management method of a mobile station apparatus in a communication system comprising a base station apparatus and a mobile station apparatus which communicate with each other by aggregating a plurality of cells of different frequencies, the radio link state management method comprising the steps of:

• configuring linkage information indicating a cooperation relation between an uplink and a downlink for the cell and a timer for managing a state of the cell which have been notified from the base station apparatus;
• and
• simultaneously changing states of the uplink and the downlink of the cell, the timer for which has expired, based on the linkage information configured by the base station apparatus.

An integrated circuit mounted in a mobile station apparatus in a communication system comprising a base station apparatus and a mobile station apparatus which communicate with each other by aggregating a plurality of cells of different frequencies and causing the mobile station apparatus to exert a plurality of functions, the integrated circuit causing the mobile station apparatus to exert a series of functions of:

• configuring linkage information indicating a cooperation relation between an uplink and a downlink of the cell and a timer for managing a state of the cell which have been notified from the base station apparatus, and
• simultaneously changing states of an uplink and a downlink of the cell, the timer for which has expired, based on the linkage information configured by the base station apparatus.