Patent ID: 7912474

Claim:
A radio channel control method for use in a cellular system, in which a base station provides a plurality of mobile stations present in a first cell covered by said base station with a first communication service by the use of a first channel and with a second communication service by the use of a second channel, a base station controller connected to said base station carrying out steps of calculating, as a load of said first cell, a load corresponding to channels currently used in said first cell, allowing assignment of said first channel if said load is not higher than a first channel threshold value for said first channel, allowing assignment of said second channel if said load is not higher than a second channel threshold value for said second channel, and allowing a mobile station present in a second cell adjacent to said first cell and using one of said first and said second channels to use said one of the first and the second channels also in said first cell if said load is not higher than a handover threshold value, wherein: said method includes the step of changing said second channel to a channel having a transmission rate lower than that of said second channel if at least one mobile station uses said second channel in said first cell and if said load of the first cell exceeds said first channel threshold value for said first channel.