Patent ID: 7006475

Claim:
A method of mobile communication using a CDMA multiplex technique, in which a base station communicates with a mobile station through a traffic channel for transmitting user data and through a perch channel for transmitting a spreading code used for demodulating the user data, wherein said traffic channel has a call control channel subjected to time division multiplex, wherein said call control channel and a part, that is provided in said perch channel and does not have orthogonality to other channels, are arranged not to overlap with each other in a time base, and wherein said base station controls transmit powers of the perch channel and traffic channel to satisfy: Pu>=Pp+SIRr−Gd where Pu is a transmit power of said traffic channel, Pp is a transmit power of said perch channel, SIRr is a signal to interference power ratio required for receiving the traffic channel without an error, and Gd=10 log (spread rate/bit rate of the traffic channel) is a spread gain of the traffic channel.