Method of transmitting terminating call signals within a restric

Details Method of transmitting terminating call signals within a restric Method of transmitting terminating call signals within a restric

1987-02-12

1988-04-05

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

455 35, 455 38, 455 54, 455 58, H04B 700

Patent

active

047364610

ABSTRACT:
A portable unit that may be called from a base station through a radio control channel by a succession of terminating call signals that is sent through the control channel from the base station to the portable unit for a first or restricted time duration (T.sub.1), selected in consideration of a battery saving period of a battery saving operation carried out in the portable unit. Within the battery saving period, the portable unit is put into transient active and inactive states during a first time interval and a second time interval, respectively. Selection is made so that the first time duration is longer than the second time interval to receive at least one of the terminating call signals within the first time duration in the portable unit. The base station monitors an acknowledgement signal for a second time duration (T.sub.2) after the lapse of the first time duration and interrupts the control channel when the acknowledgement signal is not received within the first and the second time durations. In the portable unit, the battery saving operation is released when the presence of the terminating call signals is detected by a squelch circuit.

REFERENCES:
patent: 4449248 (1984-05-01), Leslie et al.
patent: 4506386 (1985-03-01), Ichikawa et al.
patent: 4509199 (1985-04-01), Ichihara
patent: 4523332 (1985-06-01), Mori
patent: 4631496 (1986-12-01), Borras et al.
patent: 4663623 (1987-05-01), Lay et al.
patent: 4679244 (1987-07-01), Kanasaki et al.

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