Cordless telephone communication system link re-establishment pr

Details Cordless telephone communication system link re-establishment pr Cordless telephone communication system link re-establishment pr

1991-10-24

1994-01-18

Ng, Jin F.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 58, 455 511, 455 541, H04M 1100

Patent

active

052805417

ABSTRACT:
A method for re-establishing a communication link that has been lost between a portable unit (406) and a fixed unit or base station (402) provides for a way of quickly re-establishing the lost communication link, on the previously used RF channel. The method is begun by transmitting a link re-establishment code word (900) using MUX 1 after determining that synchronization has been lost (502) for a predetermined period of time (504). This is followed by automatically switching the portable unit (406) from MUX 1 to MUX 3 communication protocol. Followed by re-establishing communication (re-establish synchronization) between the portable (406) and base station (402) in MUX 3 and switching the two communication devices (402 and 406) back to MUX 1 after the communication link has been re-established. The same steps can be followed by base site (402) if it had been the first to detect loss of the communication link.

REFERENCES:
patent: 4811380 (1989-03-01), Spear
patent: 5020051 (1991-05-01), Beesley
ETSI discloses a CT2 Common Air Interface version 1.1, by European Telecommunications Standards Institute, France, Jun. 30, 1991, pp. 1-188.
DTI discloses a standarized CT2-Protocol, by the Department of Trade and Industry, London, May 1989.

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