Cordless telephone system capable of quickly establishing connec

Details Cordless telephone system capable of quickly establishing connec Cordless telephone system capable of quickly establishing connec

1991-04-24

1995-01-24

Kuntz, Curtis

Telephonic communications

Audio message storage, retrieval, or synthesis

379 63, H04M 1100

Patent

active

053848276

ABSTRACT:
In a cordless telephone system, several speech channels are periodically scanned by a base station during a standby mode to detect idle channels from the scanned channels. In response to receipt of a call request from a cordless station or an incoming call from a switched telephone network, the base station transmits a channel indicating signal to the cordless station over a control channel indicating that the detected idle channels can be used as possible candidate channels, switches to a first candidate channel and waits for an end-of-switching signal from the cordless station until a prescribed period of time expires. On receiving the channel indicating signal, the cordless station switches to the first candidate channel and makes a channel check on it and transmits an end-of-switching signal if it determines that the first candidate channel is idle. If the end-of-switching signal is not received from the cordless station before the prescribed period expires, the base station switches to a second candidate channel. If the cordless station determines that the first candidate channel is busy, it switches to the second candidate channel and makes a channel check on it. If the cordless station determines that the second candidate channel is idle, it transmits the end-of-switching signal over the second candidate channel.

REFERENCES:
patent: 4656653 (1987-04-01), Oda et al.
patent: 4672657 (1987-06-01), Dershowitz
patent: 4768220 (1988-08-01), Yoshihara et al.
patent: 4894856 (1990-01-01), Nakamishi et al.
patent: 4939785 (1990-07-01), Murata et al.

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