Patent ID: 7912110
Filing Date: 2011-03-22
Classification: H04W

Abstract:
1. A base station apparatus that communicates with a plurality of mobile stations belonging to a first wireless communication system, the base station apparatus comprising: a first wireless communication circuit that communicates with a first mobile station employing a first frequency band that is preferentially assigned to the first wireless communication system; a plurality of second wireless communication circuits that communicates with a second mobile station employing at least one of a plurality of second frequency bands that are preferentially assigned to other wireless communication systems; a frequency detection unit that detects a usage of the second frequency bands by periodically detecting an electrical power of the second frequency bands in the second wireless communication circuits; a detection result storage unit that stores a history of the usage of the second frequency bands detected by the frequency detection unit; a communication status storage unit that stores a communication status including an average communication frequency of information data per unit time during the communication with the first mobile station using the first frequency band; and a frequency change control unit that determines if there is any unused second frequency band that is not used by the other wireless communication systems, based on the history of the usage of the second frequency bands stored in the detection result storage unit, and that changes the frequency for the communication with the first mobile station using the first frequency band from the first frequency band to the unused second frequency band, based on the determination result of the unused second frequency band and the communication status for the first mobile station using the first frequency band stored in the communication status storage unit.