Patent ID: 7304970

Claim:
A traffic control method for mobile data communications of a radio base station in a mobile communication system of a scheme using spread signals including CDMA, where two types of communication channels including a common channel and a plurality of individual channels are provided such that the common channel is set to be used by a plurality of users together and each individual channel is set to be used exclusively by one user, comprising: carrying out a communication using the common channel, between a mobile radio terminal and said radio base station; receiving at the radio base station an allocation request from the mobile radio terminal after the mobile radio terminal has detected an increase or a decrease of data traffic during the communication; measuring, at the radio base station, an uplink reception interference level and a downlink transmission power level, and relaying the uplink reception interference level and the downlink transmission power level, along with respective uplink and downlink thresholds, to the mobile radio terminal; and shifting from the communication using the common channel to the communication using the individual channel between the mobile radio terminal and the radio base station, when the mobile radio terminal indicates that the uplink reception interference level and the downlink transmission power level are not greater than the respective uplink and downlink thresholds.