An improved integrated voice/data mobile radio system

Design improvements for the integrated voice/data mobile radio system proposed by H.P. Stern (1989) are suggested. Time-division multiplexing techniques are used to provide two voice paths on each 25 kHz radio channel, thereby reducing the number of channels needed to carry voice by 50%. Packetized data, voice dedicated (PDVD) burst switching is used to transmit data during the silent periods in the speech. Data capability is thereby added to the system without requiring additional radio channels. System performance is analyzed via computer simulations, which show that for public safety applications a half-duplex voice-only mobile radio system can be upgraded to an integrated voice/data system using only half as many radio channels. The data traffic is minimally delayed, and a constant, 200 ms delay is added to the voice, which is acceptable in a half-duplex environment. The integrated voice/data system can also accommodate significant growth in data traffic. >