Abstract: A multicode-based CDMA communication system is disclosed for simultaneously performing a voice communication and a data communication. When PIWF receives packet data from ISP to a personal computer while a telephone connected to SU and a telephone connected to LS are communicating a voice through SU, WSC assigns a multicode (a plurality of spread codes) for the packet data based on the amount of packet data for the personal computer, received by PIWF, and the availability of a radio channel, and notifies SU of the assigned multicode. Then, WSC transmits the packet data received from ISP through PIWF to SU using the assigned multicode as packet data for the personal computer. SU and WSC simultaneously perform a voice communication and a data communication using the multicode.

Abstract: A mobile communication system which enables any combinations of communication of speech signal and data signal to perform even during telephone communication is realized. In a mobile communication system provided with a base station control apparatus being connected to an ISDN switching unit, when data signal transmission is required while a mobile station being communicating with an ISDN terminal, a speech signal half-rate processing operation and a data signal transmission operation are commenced between the mobile station and the base station control apparatus. As for TDMA (Time Division Multiple Access) frames of signal between the mobile station and the base station, the full-rate (32 Kbps) speech signal is contained in all frames when only speech communication is performed, and each of the half-rare (16 Kbps) processed speech signal and the data signal is contained in every other frames alternatively when both of speech and data communication are performed simultaneously.