Radio communication system, base station apparatus, radio resource control method, and non-transitory computer readable medium

A base station apparatus comprising:

• a radio communication unit configured to perform radio communication including at least a first downlink communication with a first mobile station;
• a resource adjustment unit configured to determine radio resources to be allocated to the first downlink communication from a radio resource region shared with an adjacent base station;
• a first resource division unit configured to limit, to a first radio resource segment which is a part of the radio resource region, radio resources in response to estimating that communication quality of the first downlink communication using the limited first radio resource segment is improved over the communication quality of the first downlink communication when using the entire range of the radio resource region that is shared with the adjacent base station;
• a detection unit configured to detect execution of resource division by the adjacent base station for limiting radio resources used for a second downlink communication between the adjacent base station and a second mobile station to a second radio resource segment;
• and
• a second resource division unit configured to limit, to a third radio resource segment which is a part of the radio resource region and different from the second radio resource segment, radio resources allocatable to the first downlink communication by the resource adjustment unit in response to detection of the resource division by the detection unit.

A method for controlling radio resources used by a radio base station that performs radio communication including at least a first downlink communication with a first mobile station, the method comprising:

• estimating a communication quality of the first downlink communication when radio resources allocatable to the first downlink communication are limited to a part of a radio resource region shared with an adjacent base station;
• limiting, to a first radio resource segment which is a part of the radio resource region, radio resources in response to estimating that communication quality of the first downlink communication when using the limited first radio resource segment is improved over the communication quality of the first downlink communication when using the entire range of the radio resource region that is shared with the adjacent base station;
• detecting execution of resource division by the adjacent base station for limiting radio resources used for a second downlink communication between the adjacent base station and a second mobile station to a second radio resource segment;
• and
• limiting, to a third radio resource segment which is a part of the radio resource region and different from the second radio resource segment, radio resources allocatable to the first downlink communication in response to said detecting.