Radio base station apparatus, radio resource management method, radio resource management program, wireless communication apparatus, and wireless communication system

1. A radio base station apparatus, comprising:

a scanner, which, in operation, detects a use-state of a white space frequency in a neighborhood of the radio base station apparatus, and identifies a vacant white space frequency that is not allocated to any wireless terminal managed by the radio base station apparatus of a communication service provider or by another radio base station apparatus of another communication service provider, and

a radio resource allocating unit, which, in response to an allocation request for a communication frequency from a new wireless terminal, identifies a first white space frequency that is allocated to another wireless terminal managed by the radio base station apparatus and is not allocated to any wireless terminal managed by the another radio base station apparatus, and determines whether an amount of allocated radio resource of the first white space frequency is or above a threshold,

wherein,

when the amount of allocated radio resource of the first white space frequency is below the threshold, the radio resource allocation unit preferentially allocates to the new wireless terminal a vacant radio resource of the first white space frequency over a vacant radio resource of the vacant white space frequency, while continuing to allocate the first white space frequency to the another wireless terminal managed by the radio base station apparatus, and

when the amount of allocated radio resource of the first white space frequency is or above the threshold, the radio resource allocation unit allocates to the new wireless terminal a vacant radio resource of the vacant white space frequency, while continuing to allocate the first white space frequency to the another wireless terminal managed by the radio base station apparatus.

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

if the first white space frequency and a second white space frequency are present, the radio resource allocating unit allocates the second white space frequency to the new wireless terminal, wherein more other wireless terminals are allocated to the second white space frequency than to the first white space frequency.

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

if a third white space frequency is present, the radio resource allocating unit allocates the third white space frequency to the new wireless terminal, wherein the third white space frequency has a larger amount of allocated radio resource than the first white space frequency.

4. The radio base station apparatus according to claim 1 , wherein

the radio resource allocating unit, in operation, allocates to the new wireless terminal a white space frequency that has an amount of allocated radio resource that is below the threshold.

5. The radio base station apparatus according to claim 1 , further comprising:

a receiving unit, which, in operation, receives information on a use-state of a white space frequency in a neighborhood of the new wireless terminal from the new wireless terminal.

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

the amount of allocated radio resource is an amount of radio resource that is already allocated to the another wireless terminal managed by the radio base station apparatus.

7. The radio base station apparatus according to claim 1 , wherein

the amount of allocated radio resource is a total amount that is obtained by adding an amount of radio resource that is already allocated to the another wireless terminal managed by the radio base station apparatus and an amount of radio resource allocation that is requested in the allocation request for a communication frequency from the new wireless terminal.

8. The radio base station apparatus according to claim 7 , further comprising:

a transmitting unit, which, in operation, transmits packet division request information for requesting division of a transmission-target packet, to the new wireless terminal, if the amount of allocated radio resource of the first white space frequency is or above the threshold; and

a receiving unit, which, in operation, receives division information on the transmission-target packet in association with the packet division request information, wherein

the radio resource allocating unit, in operation, allocates to the new wireless terminal a vacant radio resource of the first white space frequency and a vacant radio resource of another white space frequency based on the division information on the transmission-target packet which is received by the receiving unit.

9. The radio base station apparatus according to claim 3 , wherein

if the second white space frequency and the third white space frequency are present, the radio resource allocating unit allocates the second white space frequency to the new wireless terminal.

10. The radio base station apparatus according to claim 1 , wherein

the radio resource has a plurality of resource blocks divided in a frequency domain.

11. The radio base station apparatus according to claim 1 , wherein

the radio resource has a plurality of resource blocks divided in a time domain.

12. A radio resource management method performed by a radio base station apparatus, the method comprising:

detecting a use-state of a white space frequency in a neighborhood of the radio base station apparatus, and identifying a vacant white space frequency that is not allocated to any wireless terminal managed by the radio base station apparatus of a communication service provider or by another radio base station apparatus of another communication service provider;

in response to an allocation request for a communication frequency from a new wireless terminal, identifying a first white space frequency that is allocated to another wireless terminal managed by the radio base station apparatus and is not allocated to any wireless terminal managed by the another radio base station apparatus, and determining whether an amount of allocated radio resource of the first white space frequency is or above a threshold;

when the amount of allocated radio resource of the first white space frequency is below the threshold, preferentially allocating to the new wireless terminal a vacant radio resource of the first white space frequency over a vacant radio resource of the vacant white space frequency, while continuing to allocate the first white space frequency to the another wireless terminal managed by the radio base station apparatus, and

when the amount of allocated radio resource of the first white space frequency is or above the threshold, allocating to the new wireless terminal a vacant radio resource of the vacant white space frequency, while continuing to allocate the first white space frequency to the another wireless terminal managed by the radio base station apparatus.

13. A non-transitory storage medium in which a radio resource management program is stored for causing a computer to execute each step of the radio resource management method according to claim 12 .

14. A wireless terminal that is managed by a radio base station apparatus of a communication service provider, the wireless terminal comprising:

a receiving unit, which, in operation, receives information on a vacant radio resource of a first white space frequency and on a vacant radio resource of a vacant white space frequency, wherein,

the first white space frequency is allocated to another wireless terminal managed by the radio base station apparatus and is not allocated to any wireless terminal managed by another radio base station apparatus of another communication service provider,

the vacant white space frequency is not allocated to any wireless terminal managed by the radio base station apparatus or by the another radio base station apparatus,

when an amount of allocated radio resource of the first white space frequency is below a threshold, a vacant radio resource of the first white space frequency is preferentially allocated to the wireless terminal over a vacant radio resource of the vacant white space frequency, wherein the first white space frequency continues to be allocated to the another wireless terminal managed by the radio base station apparatus, and

when the amount of allocated radio resource of the first white space frequency is or above the threshold, a vacant radio resource of the vacant white space frequency is allocated to the wireless terminal, wherein the first white space frequency continues to be allocated to the another wireless terminal managed by the radio base station apparatus; and

a transmitting unit, which, in operation, transmits a signal by using an allocated radio resource indicated by the information received by the receiving unit.

15. The wireless terminal according to claim 14 , wherein

if there is a second white space frequency to which more other wireless terminals are allocated than to the first white space frequency, the receiving unit receives information relating to the second white space frequency and the transmitting unit transmits a signal by using the second white space frequency.

16. The wireless terminal according to claim 14 , wherein

if there is a third white space that has a larger amount of allocated radio resource than that of the first white space frequency, the receiving unit receives information relating to the third white space frequency and the transmitting unit transmits a signal by using the third white space frequency.

17. The wireless terminal according to claim 14 , wherein

the transmitting unit, in operation, transmits an allocation request for a communication frequency to the radio base station apparatus of the communication service provider.

18. A wireless communication system, comprising:

a first wireless terminal; and

a radio base station apparatus of a communication service provider, the radio base station apparatus including:

a scanner, which, in operation, detects a use-state of a white space frequency in a neighborhood of the radio base station apparatus, and identifies a vacant white space frequency that is not allocated to any wireless terminal managed by the radio base station apparatus of a communication service provider or by another radio base station apparatus of another communication service provider, and

a radio resource allocating unit, which, in response to an allocation request for a communication frequency from the first wireless terminal, identifies a first white space frequency that is allocated to another wireless terminal managed by the radio base station apparatus and is not allocated to any wireless terminal managed by the another radio base station apparatus, and determines whether an amount of allocated radio resource of the first white space frequency is or above a threshold,

wherein,

when the amount of allocated radio resource of the first white space frequency is below the threshold, the radio resource allocation unit preferentially allocates to the first wireless terminal a vacant radio resource of the first white space frequency over a vacant radio resource of the vacant white space frequency, while continuing to allocated the first white space frequency to the another wireless terminal managed by the radio base station apparatus, and

when the amount of allocated radio resource of the first white space frequency is or above the threshold, the radio resource allocation unit allocates to the first wireless terminal a vacant radio resource of the vacant white space frequency, while continuing to allocate the first white space frequency to the another wireless terminal managed by the radio base station apparatus, and

the first wireless terminal, in operation, performing communication with the radio base station apparatus using a radio resource allocated to the first wireless terminal by the radio base station apparatus.

19. The radio base station apparatus according to claim 1 , wherein the radio resource allocating unit, in operation, responds to the allocation request for a communication frequency from the new wireless terminal by preferentially allocating to the new wireless terminal a vacant radio resource of the first white space frequency over a vacant radio resource of a white space frequency allocated to a wireless terminal that is managed by the another radio base station while continuing to allocate the radio resource of the first white space frequency to the another wireless terminal that is managed by the radio base station apparatus.

20. The radio base station apparatus according to claim 1 , wherein, when the amount of allocated radio resource of the first white space frequency is or above the threshold, the radio resource allocating unit preferentially allocates to the new wireless terminal the vacant radio resource of the vacant white space frequency over a vacant radio resource of a white space frequency allocated to a wireless terminal managed by the another radio base station apparatus.