Apparatus and method

1. An apparatus comprising:

circuitry configured to

perform radio communication;

transmit to an external apparatus through the radio communication control information regarding a resource to be used in the radio communication;

select a filter from a plurality of filter candidates based on information received from the external apparatus, wherein the plurality of filter candidates are stored in a memory of the apparatus and each of the plurality of filter candidates comprises a subcarrier bandwidth and a symbol length; and

limit a width of a guard band in a frequency band of the resource by applying the filter to the resource,

wherein the control information is transmitted to the external apparatus as part of a Radio Resource Control (RRC) signaling, and the control information is used by the external apparatus to set the width of the guard band.

2. The apparatus according to claim 1 , wherein the circuitry is further configured to determine an application unit to limit with the resource as a minimum unit and performs control such that information regarding the application unit is transmitted to the external apparatus through the radio communication as the control information regarding the resource.

3. The apparatus according to claim 2 , wherein the application unit is determined on a basis of a number of resources in al least one of a frequency direction and a time direction.

4. The apparatus according to claim 2 , wherein the circuitry is further configured to perform control such that information is transmitted to the external apparatus through the radio communication regarding a timing at which the application unit is switched.

5. The apparatus according to claim 1 , comprising:

a storage unit configured to store the control information,

wherein the circuitry is further configured to perform control such that the control information stored in the storage unit is transmitted to the external apparatus through the radio communication.

6. The apparatus according to claim 1 , wherein the circuitry is further configured to determine the resource to limit on a basis of a predetermined condition.

7. The apparatus according to claim 6 , wherein the circuitry is further configured to determine the resource from a plurality of preset candidates on the basis of the predetermined condition, or

after receiving a request for the resource from the external apparatus, or

in accordance with at least one of feedback from the external apparatus on a communication quality, a retransmission request from the external apparatus, position information of the external apparatus, and a request for a communication quality from the external apparatus.

8. The apparatus according to claim 1 , wherein the circuitry is further configured to perform control such that information regarding a timing at which the resource which is limited is switched is transmitted to the external apparatus through the radio communication.

9. The apparatus according to claim 1 , wherein the circuitry is further configured to determine an application unit which is limited from a plurality of preset candidates on the basis of the predetermined condition, or

after receiving a request for the application, unit which is limited from the external apparatus, or

in accordance with at least one of feedback from the external apparatus on a communication quality, a retransmission request from the external apparatus, position information of the external apparatus, and a request for a communication quality from the external apparatus.

10. The apparatus according to claim 1 , wherein the circuitry is further configured to determine the resource to limit from a plurality of preset candidates on the basis of a predetermined condition.

11. The apparatus according to claim 1 , wherein the information comprises a request from the external apparatus to switch the filter to a different one of the plurality of filter candidates.

12. The apparatus according to claim 1 , wherein the information comprises feedback from the external apparatus on a communication quality.

13. The apparatus according to claim 1 , wherein each of the plurality of filter candidates further comprises a type, a bandwidth, and an application unit.

14. An apparatus comprising:

circuitry configured to

perform radio communication;

acquire control information regarding a resource to be used in the radio communication from an external apparatus through the radio communication;

select a filter from a plurality of filter candidates based on information received from the external apparatus, wherein the plurality of filter candidates are stored in a memory of the apparatus and each of the plurality of filter candidates comprises a subcarrier bandwidth and a symbol length; and

limit a width of a guard band in a frequency band of the resource by applying the filter to the resource,

wherein the control information is acquired from the external apparatus as part of a Radio Resource Control (RRC) signaling, and the control information is used by the apparatus to set the width of the guard band.

15. The apparatus according to claim 14 , wherein the circuitry is further configured to:

perform control such that a request for switching of the resource which is limited is transmitted to the external apparatus through the radio communication in accordance with a predetermined condition.

16. The apparatus according to claim 15 , wherein the circuitry is further configured to perform control such that the request is transmitted to the external apparatus through the radio communication in accordance with a quality of the radio communication.

17. The apparatus according to claim 15 ; wherein the circuitry is further configured to perform control such that the request is transmitted to the external apparatus through the radio communication in accordance with a decoding result of data received from the external apparatus through the radio communication.

18. An apparatus comprising:

circuitry configured to

perform radio communication; and

perform control such that, on a basis of control information regarding a resource to which a filter is applied for limiting a width of a guard band in a frequency band to be used in the radio communication, the filter is applied to transmission data and the transmission data to which the filter has been applied is transmitted to an external apparatus through the radio communication,

wherein the control information is received from the external apparatus as part of a Radio Resource Control (RRC) signaling, and the control information is used by the apparatus to set the width of the guard band,

wherein the filter is selected by the external apparatus from a plurality of filter candidates based on information received from the apparatus, and

wherein the plurality of filter candidates are stored in a memory and each of the plurality of filter candidates comprises a subcarrier bandwidth and a symbol length.

19. A method comprising:

performing radio communication;

acquiring, by a processor, control information regarding a resource to be used in the radio communication from an external apparatus through the radio communication;

selecting a filter from a plurality of filter candidates based on information received from the external apparatus, wherein the plurality of filter candidates are stored in a memory and each of the plurality of filter candidates comprises a subcarrier bandwidth and a symbol length; and

limiting a width of a guard band in a frequency band of the resource by applying the filter to the resource,

wherein the control information is transmitted to the external apparatus as part of a Radio Resource Control (RRC) signaling, and the control information is used by the external apparatus to set the width of the guard band.