Equipment for wireless telephone transmission

Abstract From the Canadian patent

In equipment for wireless transmission of telephone calls between a stationary unit connected to a telephone line and a portable wireless telephone handset at a short distance from the stationary unit, all the pairs of units have access to a plurality of common duplex radio speech channels for transmitting the calls, and a common radio signalling channel for transmitting signals concerned with establishment and disconnection of the speech channels. The radio speech channels are assigned after adaptive channel scanning in that they are listened-into before a call and a channel is selected which is unoccupied. A single speech channel is used for both transmission directions which is enabled …