Patent ID: 8005110

Claim:
An uplink packet transmission method in a multi-carrier/DS-CDMA mobile communication system having n (n being a natural number equal to or more than two) subcarriers having communication channels, comprising: setting up frames that define constant intervals in each communication channel of the subcarriers, and further setting up time slots by temporally dividing each of the frames into F pieces (F being a natural number equal to or more than two), receiving from a base station k 2 (k 2 being a natural number, and k 2 ≦F) time slots for random access packet transmission, and m 2 (m 2 being a natural number, and m 2 <a total number of available spreading codes) spreading codes for spreading a random access packet, and spreading, in a mobile station, a random access packet to be transmitted by one of the spreading codes in synchronization with a timing of the time slots, and transmitting the random access packet to the base station.