FIELD: mobile communications using code-division multiple access systems. SUBSTANCE: when large amount of user data are formed in mobile station, the latter generates request message for additional channel including additional channel request information required to transfer from control holding state to high-speed transmission substate without intermediate transfer to low transmission speed substate and information about state-to-state transfer needed to transfer from control holding state to active state, and also transfers additional channel request message to base station. EFFECT: facilitated procedure of data transfer in code-division multiple access system. 10 cl, 7 dwg
