Dual system cellular cordless radiotelephone apparatus with sub-data channel timing monitor

Abstract From the Canadian patent

A cellular cordless telephone may receive cellular telephone calls via a cellular telephone system and receive telephone calls on a system having a limited radio coverage area. To reduce the amount of time spent in monitoring the sub-data channel of the limited coverage area system a, timing signal is generated which represents the period of time spent monitoring the radio channel. During the monitoring a predetermined number of data words transmitted on the limited radio coverage area radio channel system are received. When a first received data word is detected an, allowed monitoring time value is adjusted to be the sum of the value of the timing signal and the product of a determined …