Cordless telephone allowing for alternate two=way traffic - reduces frequency spacing of duplex channels at main station as relay between two mobile stations

摘要

The main station (BS) and mobile stations (MS) communicate by transmission of call signs (K), which their receivers (EBS, EMS) acknowledge after comparison with the contents of memories (SPBS,SPMS) to initiate conversation over another free channel. The mobile telephones can converse among themselves, using the main station as a relay, whose controller (STBS) assigns two appropriate channels. The duplex channel spacing is changed for this purpose from 45 MHz to an integral multiple of 25 kHz at the main station only. USE/ADVANTAGE - For cordless telephone system, with reduced circuit complexity and the system can be introduced without special measures.