Patent ID: 8649815

Claim:
A communication system comprising a plurality of wireless terminals and a base station device that wirelessly communicates with the plurality of wireless terminals, wherein said base station device includes: a processor configured to set, when a bandwidth of a signal to be transmitted from the base station device to one of the wireless terminals is set from a first bandwidth to a second bandwidth, which is narrower than the first bandwidth, a transmission power per unit bandwidth of the signal transmitted from the base station device to the one wireless terminal from a first transmission power to a second transmission power, which is larger than the first transmission power, and to set, when the bandwidth is set from the second bandwidth to the first bandwidth, the transmission power from the second transmission power to the first transmission power; and said one wireless terminal includes a receiver configured to receive a notification of the set bandwidth and uses the set bandwidth to receive a signal transmitted by the set transmission power per unit bandwidth, wherein when a communication quality of a wireless terminal that has generated a communication request is worse than the communication quality of a wireless terminal having a worst communication quality among the plurality of wireless terminals in communication with the base station device, the processor of the base station device sets the bandwidth to be narrower than a previously defined bandwidth and the transmission power to be higher than a previously defined transmission power; and when the communication quality of the wireless terminal that has generated the communication request is better than the communication quality of the wireless terminal having the worst communication quality, the processor of the base station device does not change the bandwidth transmission power.