Mobile station and control method

1. A mobile station for communication using carrier aggregation, comprising:

a secondary cell state management circuitry configured to manage whether a state of a secondary cell is an activation state or a deactivation state;

a transmission control circuitry configured to stop transmission of uplink control information on a physical uplink control channel in a first secondary cell, when the state of the first secondary cell managed by the secondary cell state management circuitry is the deactivation state at a timing of transmission of the physical uplink control channel in the first secondary cell; and

a resource management circuitry configured to manage a resource for a physical uplink shared channel,

wherein the transmission control circuitry controls transmission such that the uplink control information to be transmitted on the physical uplink control channel in the first secondary cell is transmitted using the physical uplink shared channel, when a resource for the physical uplink shared channel is available at the timing of transmission of the physical uplink control channel in the first secondary cell.

2. The mobile station as claimed in claim 1 , wherein the transmission control circuitry controls transmission such that the uplink control information to be transmitted on the physical uplink control channel in the first secondary cell is transmitted using either a physical uplink control channel in a primary cell or a physical uplink control channel in a second secondary cell in the activation state at the timing of transmission of the physical uplink control channel in the first secondary cell.

3. The mobile station as claimed in claim 2 , wherein the transmission control circuitry selects a cell in which the uplink control information to be transmitted on the physical uplink control channel in the first secondary cell is transmitted, based on a secondary cell index or cell quality.

4. A control method in a mobile station for communication using carrier aggregation, comprising the steps of:

managing, by a secondary cell state management circuitry, whether a state of a secondary cell is an activation state or a deactivation state;

stopping transmission of uplink control information on a physical uplink control channel in a first secondary cell, when the state of the first secondary cell managed by the secondary cell state management circuitry is the deactivation state at a timing of transmission of the physical uplink control channel in the first secondary cell; and

managing a resource for a physical uplink shared channel,

wherein the uplink control information to be transmitted on the physical uplink control channel in the first secondary cell is transmitted using the physical uplink shared channel, when a resource for the physical uplink shared channel is available at the timing of transmission of the physical uplink control channel in the first secondary cell.

5. A mobile station for communication using carrier aggregation, comprising:

a secondary cell state management circuitry configured to manage whether a state of a secondary cell is an activation state or a deactivation state;

a state inconsistency detection circuitry configured to detect inconsistency of a state where the state of the secondary cell managed by the secondary cell state management circuitry is the deactivation state and a state of the secondary cell managed by a base station is the activation state; and

a transmission circuitry configured to transmit a notification to the base station that the state of the secondary cell is the deactivation state, when the inconsistency of the state of the secondary cell is detected by the state inconsistency detection circuitry.

6. A control method in a mobile station for communication using carrier aggregation, comprising the step of:

managing, by a secondary cell state management circuitry, whether a state of a secondary cell is an activation state or a deactivation state;

detecting inconsistency of a state where the state of the secondary cell managed by the secondary cell state management circuitry is the deactivation state and a state of the secondary cell managed by a base station is the activation state; and

transmitting a notification to the base station that the state of the secondary cell is the deactivation state, when the inconsistency of the state of the secondary cell is detected.

7. A mobile station for communication using carrier aggregation, comprising:

a reception circuitry configured to receive an instruction from a base station to transition a secondary cell to a deactivation state; and

a transition instruction control circuitry configured to discard the instruction received by the reception circuitry, when, the instruction received by the reception circuitry is an instruction for a secondary cell in which transmission of a physical uplink control channel is supported.

8. The mobile station as claimed in claim 7 , wherein the transition instruction control circuitry keeps the secondary cell in an activation state when a timer expires, the timer being set to transition the secondary cell in which transmission of the physical uplink control channel is supported to the deactivation state.

9. A control method in a mobile station for communication using carrier aggregation, comprising the steps of:

receiving an instruction from a base station to transition a secondary cell to a deactivation state; and

discarding the received instruction, when the received instruction is an instruction for a secondary cell in which transmission of a physical uplink control channel is supported.