Patent ID: 7856241

Claim:
A mobile communications system having a plurality of mobile stations for transmitting radio channel quality information using an uplink dedicated channel and a radio base station for communicating with the plurality of mobile stations and transmitting a packet to the plurality of mobile stations using a downlink shared channel, said radio base station comprising: selecting means selecting a subset of the plurality of mobile stations in which the transmission state of the packet fails to achieve a predetermined radio channel quality, wherein as a transmission state of the packet, an elapsed time relative to the present time from a transmission time of a last packet transmitted before the current time, is employed, the selecting means selecting the subset of the plurality of mobile stations in order of longer elapsed time; first deciding means deciding a mobile station to which a transmission opportunity is assigned in accordance with a PF scheduler metric, with respect to the subset of the plurality of mobile stations selected by the selecting means; and second deciding means deciding a mobile station to which a transmission opportunity is assigned in accordance with a Max C/I scheduler, when no mobile station fails to achieve the predetermined radio channel quality.