RADIO COMMUNICATION DEVICE, RADIO COMMUNICATION SYSTEM, AND COMMUNICATION CONTROL METHOD

PROBLEM TO BE SOLVED: To select an optimal setting determining the cause of a communication error in a radio communication system in which a suitable setting is selected from plural levels of transmission power and plural modulation schemes.SOLUTION: A radio communication device comprises: a communication error cause estimation unit which determines cause of a communication error from a reception power intensity of the next data communication when the communication error has occurred; means which determines that there is a high possibility of a communication error caused by insufficient reception power if the reception signal intensity is smaller than a preset threshold at which data can be received without an error, and determines that there is a high possibility of an error caused by radio wave interference if the reception signal intensity is larger than the threshold; an interference suppression-type transmission power control unit which decreases transmission power when communication is successful for a preset number of consecutive times; and means which increases transmission power if the communication error cause estimation unit has determined that there is a high possibility of a communication error caused by insufficient reception power, and maintains or decreases transmission power if the communication error cause estimation unit has determined that there is a high possibility of an error caused by radio wave interference.