Method of connecting a cordless telephone by radio

Details Method of connecting a cordless telephone by radio Method of connecting a cordless telephone by radio

1988-07-18

1989-08-08

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 34, 379 61, 379 62, H04Q 700

Patent

active

048560839

ABSTRACT:
A method of connecting a cordless telephone by radio without using control channels selects priority radio channels from radio channels which are shared by cordless telephones and assigns each of them to a respective one of the cordless telephones. So long as the priority radio channel assigned to any of the telephones is not occupied by another telephone, that telephone uses it. A portable unit of the telephone is allowed to enter into a call origination flow in response to a call origination request only after confirming that an incoming calling signal is not being sent over the priority radio channel from a fixed unit which is associated with the portable unit. Even when a call origination request occurs before a radio connection for an incoming call, the fixed and portable units are prevented from tuning to different radio channels without the need for a control channel.

REFERENCES:
patent: 4056780 (1977-11-01), Faulkner
patent: 4284848 (1981-08-01), Frost
patent: 4430755 (1984-02-01), Nadir
patent: 4511761 (1985-04-01), Yamazaki et al.
patent: 4672657 (1987-06-01), Dershowitz
patent: 4679225 (1987-07-01), Higashiyama
patent: 4689812 (1987-08-01), Hata
patent: 4716407 (1987-12-01), Borras et al.
patent: 4744101 (1988-05-01), Saegusa
patent: 4768219 (1988-08-01), Yamagata et al.

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