Patent ID: 8559938

Claim:
A base station comprising: a communicating unit configured to make a radio communication with a plurality of mobile stations; a detecting unit configured to detect a collision of requests from the plurality of mobile stations received by the communicating unit when a reception level of one of a call request signal and a connection request signal that is received from at least two of the plurality of mobile stations, selecting identical preamble numbers, exceeds a threshold value; and a signal processing unit configured to send from the communicating unit to the plurality of mobile stations a notifying signal notifying a plurality of radio resources from which one radio resource is to be selected at one of the plurality of mobile stations when existence of a plurality of paths is judged by the signal processing unit and the collision is detected by the detecting unit, wherein the notifying signal includes a preamble number selected by the one of the plurality of mobile stations, and information granting allocation of an uplink radio resource to be used by the one of the plurality of mobile stations.