Patent ID: 6351459
Filing Date: 2002-02-26
Classification: H04W

Abstract:
A method of controlling random access in a mobile communication system, comprising the steps of:establishing a random access channel for use in random access communications in a frequency band different from a frequency band for continuous communications between a mobile station and a base station; transmitting broadcast information containing idle information about a communication channel via a broadcast channel from the base station to the mobile station; effecting random access communications via said random access channel from said mobile station to said base station, to thereby reserve an idle communication channel; broadcasting said mobile station of information that the reservation of the idle communication channel is accepted and information indicative of a condition for a packet transmission from said base station if said base station accepts the reservation of the idle communication channel; starting to transmit a packet from said mobile station to said base station via the reserved idle communication channel according to the condition for the packet transmission when said mobile station receives the information that the reservation of the idle communication channel is accepted and the information indicative of the condition for the packet transmission; and lowering a spreading ratio at which to spread a symbol to be transmitted according to a spreading code for the random access communications from said mobile station to said base station.