Mobile communication system and mobile communication method

摘要

An estimator (120) of a mobile station (100a) of the present invention estimates travelling speed information which is a value variable with either a travelling speed of the mobile station or a variation in the travelling speed. A comparison unit (130) or a comparison unit (320) compares the travelling speed information estimated by the estimator with a threshold defined as a value of travelling speed information for achieving a desired level of communication quality which varies depending on the travelling speed. A selector (150) or a selector (340) selects an applicable frequency band in response to a result of comparison.