Apparatus and method for alternative radiotelephone system selec

Details Apparatus and method for alternative radiotelephone system selec Apparatus and method for alternative radiotelephone system selec

1992-02-06

1993-11-09

Ng, Jin F.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

H04M 1100

Patent

active

052609880

ABSTRACT:
A dual mode cellular cordless portable radiotelephone preferentially selects the cordless base station over the cellular system when in range of the cordless base station. When the cordless cellular portable is operating in the cellular mode, the radio channel associated with the cordless base station is sampled for a predetermined time. When a signal on the sampled cordless base station channel is detected, the cordless portable moves to the cordless mode and remains in the cordless mode for as long as the signal quality of the signal on the cordless base station channel exceeds a predetermined value.

REFERENCES:
patent: 4481382 (1984-11-01), Villa-Real
patent: 4682351 (1987-07-01), Makino
patent: 4706274 (1987-11-01), Baker et al.
patent: 4745632 (1988-05-01), Duffy
patent: 4879740 (1989-11-01), Nagashima et al.
patent: 4989230 (1991-01-01), Gillig et al.
patent: 5127042 (1992-06-01), Gillig et al.

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