Radio communication system, base station apparatus, terminal apparatus, and radio communication method in radio communication system

1. A radio communication system, comprising:

a base station apparatus; and

a terminal apparatus, wherein

radio communication is performed between the base station apparatus and terminal apparatus,

the terminal apparatus includes:

a required time notification signal generation unit configured to generate a required time notification signal indicating a required time to allow the terminal apparatus to process a change of a radio transmission bandwidth or a radio reception bandwidth; and

a transmission unit configured to transmit the required time notification signal to the base station apparatus,

the base station apparatus includes a reception unit configured to receive the required time notification signal, and

the required time is a time after the transmission unit is configured to transmit the required time notification signal until the terminal apparatus is configured to receive a control signal transmitted from the base station apparatus.

2. The radio communication system according to claim 1 , wherein the base station apparatus further includes a transmission unit configured to transmit to the terminal apparatus a bandwidth change request requesting change of radio bandwidth for the terminal apparatus, after receiving the required time notification signal.

3. The radio communication system according to claim 2 , wherein

the transmission unit of the base station apparatus is configured to transmit to the terminal apparatus the bandwidth change request and an uplink control signal, and

the terminal apparatus is configured to change the radio transmission bandwidth in accordance with the bandwidth change request.

4. The radio communication system according to claim 2 , wherein

the transmission unit of the base station apparatus is configured to transmit to the terminal apparatus the bandwidth change request and a downlink control signal, and

the terminal apparatus is configured to modify the radio reception bandwidth in accordance with the bandwidth change request.

5. The radio communication system according to claim 2 , wherein

the transmission unit of the base station apparatus is configured to transmit to the terminal apparatus the bandwidth change request and a completion timing of bandwidth change, and

the terminal apparatus is configured to change the radio transmission bandwidth or the radio reception bandwidth according to the completion timing of bandwidth change.

6. The radio communication system according to claim 2 , wherein the bandwidth change request includes information relating to a changed bandwidth for the terminal apparatus.

7. The radio communication system according to claim 2 , wherein the bandwidth change request includes the changed bandwidth and a completion timing of bandwidth change.

8. The radio communication system according to claim 1 , wherein the base station apparatus further includes a scheduler configured to stop transmission or reception allocation for the terminal apparatus during the required time.

9. The radio communication system according to claim 1 , wherein the base station apparatus further includes a scheduler configured not to change the radio transmission bandwidth or the radio reception bandwidth for the terminal apparatus during the required time.

10. The radio communication system according to claim 1 , wherein the terminal apparatus further includes a terminal setting control unit configured to specify a terminal category relating to terminal capability of the terminal apparatus based on the required time.

11. The radio communication system according to claim 1 , wherein the terminal apparatus further includes a terminal setting control unit configured to control such that transmission operation or reception operation to or from the base station apparatus is stopped during the required time.

12. The radio communication system according to claim 11 , wherein the setting control unit is configured to perform transmission operation or reception operation to or from the base station apparatus after the required time has elapsed.

13. The radio communication system according to claim 1 , wherein the base station apparatus further includes a transmission unit configured to transmit a control signal to perform transmission operation or reception operation to or from the terminal apparatus, after the required time has elapsed.

14. The radio communication system according to claim 1 , wherein

the transmission unit is configured to transmit to the base station apparatus, in place of the required time, a terminal category specified by a terminal setting control, and

the base station apparatus is configured to stop transmission operation or reception operation to or from the terminal apparatus during the required time specified based on the terminal category.

15. A terminal apparatus for performing radio communication with a base station apparatus, the terminal apparatus comprising:

a required time notification signal generation unit configured to generate a required time notification signal indicating a required time to allow the terminal apparatus to process a change of a radio transmission bandwidth or a radio reception bandwidth to the base station apparatus; and

a transmission unit configured to transmit the required time notification signal to the base station apparatus, and

the required time is a time after the transmission unit is configured to transmit the required time notification signal until the terminal apparatus is configured to receive a control signal transmitted from the base station apparatus.

16. A base station apparatus for performing radio communication with a terminal apparatus, the base station apparatus comprising:

a reception unit configured to receive from the terminal apparatus a required time notification signal indicating a required time to allow the terminal apparatus to process a change of a radio transmission bandwidth or a radio reception bandwidth for the terminal apparatus, and

the required time is a time after the terminal apparatus is configured to transmit the required time notification signal until the terminal apparatus is configured to receive a control signal transmitted from the base station apparatus.

17. A radio communication method in a radio communication system for performing radio communication between a base station apparatus and a terminal apparatus, the method comprising:

generating a required time notification signal indicating a required time to allow the terminal apparatus to process a change of a radio transmission bandwidth or a radio reception bandwidth to the base station apparatus, and transmitting the required time notification signal, by the terminal apparatus; and

receiving the required time notification signal by the base station apparatus, wherein

the required time is a time after the terminal apparatus is configured to transmit the required time notification signal until the terminal apparatus is configured to receive a control signal transmitted from the base station apparatus.

18. A radio communication system comprising:

a base station apparatus; and

a terminal apparatus, wherein

the base station apparatus and terminal apparatus perform radio communication, the terminal apparatus includes:

a memory unit configured to store a required time to allow the terminal apparatus to process a change of a radio transmission bandwidth or a radio reception bandwidth to the base station apparatus in advance,

the base station apparatus includes:

a control unit configured to control to transmit at least one of a data and control signal to the terminal apparatus after the required time has elapsed, without transmitting the data and control signal to the terminal apparatus during the required time, and

the required time is a time after the terminal apparatus is configured to transmit a required time notification signal indicating the required time until the terminal apparatus is configured to receive at least one of the data and control signal transmitted from the base station apparatus.

19. A base station apparatus in a radio communication system for performing radio communication between the base station apparatus and a terminal apparatus, the base station apparatus comprising:

a control unit configured to control to transmit at least one of a data and control signal to the terminal apparatus after a required time to allow the terminal apparatus to process a change of a radio transmission bandwidth or a radio reception bandwidth of the terminal apparatus has elapsed, without transmitting the data and control signal to the terminal apparatus during the required time, wherein

the required time is a time after the terminal apparatus is configured to transmit a required time notification signal indicating the required time until the terminal apparatus is configured to receive at least one of the data and control signal transmitted from the base station apparatus.

20. A terminal apparatus in a radio communication system for performing radio communication between a base station apparatus and the terminal apparatus, the terminal apparatus comprising:

a memory unit configured to store a required time to allow the terminal apparatus to process a change of a radio transmission bandwidth or a radio reception bandwidth in advance; and

a reception unit configured to receive at least one of a data and control signal transmitted from the base station apparatus after the required time has elapsed, wherein

the required time is a time after the terminal apparatus is configured to transmit a required time notification signal indicating the required time until the terminal apparatus is configured to receive at least one of the data and control signal.