Base station apparatus, radio communication system, and radio communication controlling method

1. A base station apparatus comprising:

a radio signal receiving apparatus that receives a radio signal transmitted from a mobile station apparatus, the radio signal including component-carrier allocation request information of the mobile station apparatus, the component-carrier allocation request information indicating a policy on component-carrier allocation requested by the mobile station apparatus and indicating one of a first request, a second request, a third request and a fourth request, the first request indicating no allocation request, the second request indicating a request for allocation of a plurality of component carriers within one frequency band, the third request indicating a request for allocation of a plurality of component carriers of different frequency bands, the fourth request indicating a request for allocation of discontinuous component carriers within one frequency band;

a radio signal transmitting apparatus; and

a processor that performs a process including:

decoding, from among the radio signal received by the radio signal receiving apparatus, control data that includes the component-carrier allocation request information and information indicating frequency bands that the mobile station apparatus is capable of dealing with and indicating component carriers and scenarios for carrier aggregation;

receiving the decoded control data;

calculating, in accordance with the received control data, a transmissionbandwidth adjacency level value indicating a policy on component-carrier allocation to the mobile station apparatus;

determining, in accordance with the calculated transmission-bandwidth adjacency level value and the component-carrier allocation request information, a component carrier to be allocated to the mobile station apparatus from among the component carriers and the frequency bands that the mobile station apparatus is capable of dealing with; and

generating a transmission signal that includes information indicating the determined component carrier, wherein

the radio signal transmitting apparatus transmits the generated transmission signal to the mobile station apparatus.

2. The base station apparatus according to claim 1 , wherein

the radio signal received by the radio signal receiving apparatus includes the transmission-bandwidth adjacency level value, and

the processor determines, in accordance with the transmission-bandwidth adjacency level value included in the radio signal, a component carrier to be allocated to the mobile station apparatus from among the component carriers and the frequency bands that the mobile station apparatus is capable of dealing with.

3. The base station apparatus according to claim 2 , wherein

the transmission-bandwidth adjacency level value included in the radio signal received by the radio signal receiving apparatus is calculated by the mobile station apparatus.

4. The base station apparatus according to claim 2 , wherein

the transmission-bandwidth adjacency level value included in the radio signal received by the radio signal receiving apparatus is calculated by a calculation processing apparatus that is different from the mobile station apparatus and the base station apparatus.

5. The base station apparatus according to claim 1 , wherein

the component-carrier allocation request information is determined by the mobile station apparatus in accordance with a signal level of a radio signal that the mobile station apparatus receives from the base station apparatus.

6. The base station apparatus according to claim 1 , wherein

the processor changes, when the component carrier that the mobile station apparatus is capable of dealing with is not allocated to the mobile station due to component-carrier allocation of the component carrier to another mobile station apparatus, the component-carrier allocation to the another mobile station apparatus from the component carrier allocated to the another mobile station apparatus to a component carrier that is not allocated to any mobile station apparatus from among component carriers that the base station apparatus is capable of allocating, and allocates, to the mobile station apparatus, the component carrier that the another mobile station apparatus is not used as a result of the change in the component-carrier allocation.

7. A radio communication system comprising:

a mobile station apparatus; and

a base station apparatus, wherein

the mobile station apparatus includes

a storage device that stores mobile station capability information that includes information indicating a scenario for carrier aggregation that the mobile station apparatus is capable of dealing with,

a first processor that reads mobile station capability information stored by the storage device, that, in accordance with the read mobile station capability information, calculates a transmission-bandwidth adjacency level value indicating a policy on component-carrier allocation to the mobile station apparatus, and that generates a transmission signal that includes the calculated transmission-bandwidth adjacency level value and component-carrier allocation request information of the mobile station apparatus, the component-carrier allocation request information indicating a policy on component-carrier allocation requested by the mobile station apparatus and indicating one of a first request, a second request, a third request and a fourth request, the first request indicating no allocation request, the second request indicating a request for allocation of a plurality of component carriers within one frequency band, the third request indicating a request for allocation of a plurality of component carriers of different frequency bands, the fourth request indicating a request for allocation of discontinuous component carriers within one frequency band, and

a first radio-signal transmitting apparatus that transmits the generated transmission signal to the base station,

the base station apparatus includes

a radio signal receiving apparatus that receives the radio signal transmitted from the mobile station apparatus,

a second processor that

decodes, from among the radio signal received by the radio signal receiving apparatus, control data that includes the component-carrier allocation request information, the transmission-bandwidth adjacency level value, and frequency bands and component carriers that the mobile station apparatus is capable of dealing with,

receives the decoded control data,

determines, in accordance with the transmission-bandwidth adjacency level value and the component-carrier allocation request information included in the received control data, a component carrier to be allocated to the mobile station apparatus from among the frequency bands and component carriers that the mobile station apparatus is capable of dealing with, and

generates a transmission signal that includes information indicating the determined component carrier, and

a second radio-signal transmitting apparatus that transmits the generated transmission signal to the mobile station apparatus.

8. The radio communication system according to claim 7 , wherein

the first processor

measures a signal level of the radio signal received from the base station apparatus, and

determines the component-carrier allocation request information in accordance with the measured signal level of the radio signal.

9. The radio communication system according to claim 7 , wherein

the second processor changes, when the component carrier that the mobile station apparatus is capable of dealing with is not allocated to the mobile station due to component-carrier allocation of the component carrier to another mobile station apparatus, the component-carrier allocation to the another mobile station apparatus from the component carrier allocated to the another mobile station apparatus to a component carrier that is not allocated to any mobile station apparatus from among component carriers that the base station apparatus is capable of allocating, and allocates, to the mobile station apparatus, the component carrier that the another mobile station apparatus is not used as a result of the change in the component-carrier allocation.

10. A radio communication controlling method performed by a base station apparatus comprising:

receiving, by a radio signal receiving apparatus, a radio signal transmitted from a mobile station apparatus, the radio signal including component-carrier allocation request information of the mobile station apparatus, the component-carrier allocation request information indicating a policy on component-carrier allocation requested by the mobile station apparatus and indicating one of a first request, a second request, a third request and a fourth request, the first request indicating no allocation request, the second request indicating a request for allocation of a plurality of component carriers within one frequency band, the third request indicating a request for allocation of a plurality of component carriers of different frequency bands, the fourth request indicating a request for allocation of discontinuous component carriers within one frequency band;

decoding, from among the radio signal received by the radio signal receiving apparatus, control data that includes the component-carrier allocation request information and information indicating frequency bands that the mobile station apparatus is capable of dealing with and indicating component carriers and scenarios for carrier aggregation;

calculating, in accordance with the decoded control data, a transmission-bandwidth adjacency level value indicating a policy on component-carrier allocation to the mobile station apparatus, and

determining, in accordance with the calculated transmission-bandwidth adjacency level value and the component-carrier allocation request information, a component carrier to be allocated to the mobile station apparatus from among the component carriers and the frequency bands that the mobile station apparatus is capable of dealing with;

generating a transmission signal that includes information indicating the determined component carrier; and

transmitting the generated transmission signal to the mobile station apparatus.

11. The radio communication controlling method according to claim 10 , wherein

the received radio signal includes the transmission-bandwidth adjacency level value, and

the radio communication controlling method further comprises:

determining, in accordance with the transmission-bandwidth adjacency level value included in the radio signal, a plurality of component carriers to be allocated to the mobile station apparatus from among the component carriers and the frequency bands that the mobile station apparatus is capable of dealing with.

12. The radio communication controlling method according to claim 11 , wherein

the transmission-bandwidth adjacency level value included in the radio signal received by the radio signal receiving apparatus is calculated by the mobile station apparatus.

13. The radio communication controlling method according to claim 11 , wherein

the transmission-bandwidth adjacency level value included in the radio signal received by the radio signal receiving apparatus is calculated by a calculation processing apparatus that is different from the mobile station apparatus and the base station apparatus.

14. The radio communication controlling method according to claim 10 , wherein

the component-carrier allocation request information is determined by the mobile station apparatus in accordance with a signal level of a radio signal that the mobile station apparatus receives from the base station apparatus.

15. The radio communication controlling method according to claim 10 , further comprising:

changing, when the component carrier that the mobile station apparatus is capable of dealing with is not allocated to the mobile station due to component-carrier allocation of the component carrier to another mobile station apparatus, the component-carrier allocation to the another mobile station apparatus from the component carrier allocated to the another mobile station apparatus to a component carrier that is not allocated to any mobile station apparatus from among component carriers that the base station apparatus is capable of allocating, and

allocating, to the mobile station apparatus, the component carrier that the another mobile station apparatus is not used as a result of the change in the component-carrier allocation.