Patent ID: 7366143

Claim:
A radio base station that communications with one or more mobile stations using a time division multiplexing, comprising: a first radio unit communicating by radio with the one or more mobile stations using a plurality of slots that constitute a first communication frame; a second radio unit communicating by radio with the one or more mobile stations using a plurality of slots that constitute a second communication frame; a table storage unit storing therein, for each mobile station that has established a communication channel, (i) a reception level of a signal received from the mobile station, and (ii) information of each slot used for communication with the mobile station, the reception level being stored associated with the information; and a controlling unit, in response to a channel establishment request issued from a new mobile station, (i) when the first and second frames each have one or more empty slots, allocate one of the empty slots of each of the frames to the new mobile station; and (ii) when neither of the first nor second frames has an empty slot, (a) select two mobile stations with highest reception levels from the table storage unit, (b) perform slot switching processing on the two mobile stations, and thus (c) allocate one or two slots to the new mobile station.