Cordless telephone system adaptive links between base units and

Details Cordless telephone system adaptive links between base units and Cordless telephone system adaptive links between base units and

1993-08-10

1996-02-20

Bost, Dwayne D.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 58, 379 60, 455 332, H04Q 738

Patent

active

054936055

ABSTRACT:
The present invention eliminates the need for non-audio communications performed between base units and handset units to identify the handset unit existing communication zones, and thereby reduces the consumption of handset unit batteries to extend the lives thereof. The cordless system telephone apparatus in accordance with the invention comprises a control unit connected to a public communication network through telephone lines, a plurality of base units connected to the control unit, and a plurality of handset units communicating with the base units by way of radio waves. In waiting states where the handset units are not in audio communication with the base units, the control unit does not carry out, through the communications with the base units, identifications or registrations of the communication zones in which the handset units exist. The switching of the base units for higher communication qualities is only conducted during audio communications. In those periods, the control unit is, for the switching, provided with outside-zone signals based on the levels of the signals received through respective message channels by the handset units or base units.

REFERENCES:
patent: 4144412 (1979-03-01), Ito et al.
patent: 4765753 (1988-08-01), Schmidt
patent: 4833702 (1989-05-01), Shitara et al.
patent: 5067171 (1991-11-01), Kawano
patent: 5101501 (1992-03-01), Gilhousen et al.
patent: 5243641 (1993-09-01), Evans
patent: 5327574 (1994-07-01), Monma et al.
patent: 5396541 (1995-03-01), Farwell et al.

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