Patent ID: 6049536
Filing Date: 2000-04-11
Classification: H04B,H04J

Abstract:
A code division multiple access communication method of dividing a frequency band in a communication channel between a base station and a plurality of mobile stations belonging to said base station into a reverse-link frequency band for transmitting a packet heading from each of said plurality of mobile stations to said base station and a forward-link frequency band for transmitting a packet heading from said base station to each of said plurality of mobile stations, said base station, in response to a reservation packet coming from each of said plurality of mobile stations, transmitting a response packet to each of said plurality of mobile stations for specifying a data traffic channel and a time slot, each of said plurality of mobile stations transmitting a data packet in said time slot specified on said data traffic channel specified in said response packet, said code division multiple access communication method comprising the steps of:defining, in each of the reverse link and the forward link frequency band, a plurality of carrier frequencies in correspondence to a plurality of sub frequency bands each having one of bandwidths of a plurality of types, said plurality of sub frequency bands being superimposed on each other in the reverse-link and the forward-link frequency band, and assigning in advance, for each of said plurality of mobile stations, a reverse-link sub frequency band and a forward-link sub frequency band from said plurality of sub frequency bands each of the reverse-link and the forward-link sub frequency band having a bandwidth matching data traffic rate;spectrum-spreading, by each of said plurality of mobile stations, the reservation packet containing a mobile station identification by a spreading code for a reservation channel and transmitting a resultant packet by the prescribed carrier frequency corresponding to the reverse-link sub frequency band;spectrum-spreading, by said base station, the response packet addressed to each of said plurality of mobile stations by a spreading code for a response channel and transmitting a resultant packet by the prescribed carrier frequency corresponding to the forward-link sub frequency band assigned to each of said plurality of mobile stations; andspectrum-spreading, by each of said plurality of mobile stations, the data packet by a spreading code for the data traffic channel specified in said response packet and transmitting a resultant packet by the prescribed reverse-link carrier frequency.