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Pub. No.:    WO/1990/009072    International Application No.:    PCT/GB1990/000118
Publication Date: 09.08.1990 International Filing Date: 26.01.1990
H04J 3/06 (2006.01), H04L 7/04 (2006.01), H04M 1/725 (2006.01), H04M 1/733 (2006.01)
Applicants: BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY [GB/GB]; 81 Newgate Street, London EC1A 7AJ (GB) (For All Designated States Except US).
FERRANTI CREDITPHONE LIMITED [GB/GB]; St Mary's Road, Moston, Manchester M10 0BE (GB) (For All Designated States Except US).
GEC PLESSEY TELECOMMUNICATIONS LIMITED [GB/GB]; New Century Park, P.O. Box 53, Coventry CV3 1HJ (GB) (For All Designated States Except US).
MERCURY COMMUNICATIONS LIMITED [GB/GB]; New Mercury House, 26 Red Lion Square, London WC1R 4HQ (GB) (For All Designated States Except US).
ORBITEL MOBILE COMMUNICATIONS LIMITED [GB/GB]; The Keytech Centre, Ashwood Way, Basingstoke, Hampshire RG23 8BG (GB) (For All Designated States Except US).
SHAYE COMMUNICATIONS LIMITED [GB/GB]; Capital House, 48-52 Andover Road, Winchester, Hampshire SO23 7BH (GB) (For All Designated States Except US).
PHONEPOINT LIMITED [GB/GB]; The Quadrangle, 180 Wardour Street, London W1V 3AA (GB) (For All Designated States Except US).
STC PLC [GB/GB]; 1B Portland Place, London W1N 3AA (GB) (For All Designated States Except US).
BARNES, Nigel, Everard [GB/GB]; (GB) (For US Only).
BIDWELL, Brian, Alfred [GB/GB]; (GB) (For US Only).
BUD, Andrew [GB/IT]; (IT) (For US Only).
CRISP, Malcolm [GB/GB]; (GB) (For US Only).
DUDEK, Michael, T. [GB/US]; (GB) (For US Only).
GOODINGS, Rupert [GB/GB]; (GB) (For US Only).
ODHAMS, David, Crawford [GB/GB]; (GB) (For US Only).
PROCTOR, Peter, Nicholas [GB/GB]; (GB) (For US Only).
RODGERS, Ian [GB/GB]; (GB) (For US Only)
Inventors: BARNES, Nigel, Everard; (GB).
BIDWELL, Brian, Alfred; (GB).
BUD, Andrew; (IT).
CRISP, Malcolm; (GB).
DUDEK, Michael, T.; (GB).
GOODINGS, Rupert; (GB).
ODHAMS, David, Crawford; (GB).
PROCTOR, Peter, Nicholas; (GB).
Agent: KENNINGTON, Eric, Alasdair; Beresford & Co, 2-5 Warwick Court, High Holborn, London WC1R 5DJ (GB)
Priority Data:
8901756.0 27.01.1989 GB
8901823.8 27.01.1989 GB
Abstract: front page image
(EN)A communication procedure suitable for a cordless telephone system involves time division duplex radio communication between a handset (11) and a base station (3) using alternating bursts of transmission over a single radio channel. Once a radio link has been set up, initial transmissions carry a synchronisation logical channel (S) and a signalling logical channel (D) multiplexed together, but the link may switch to bursts carrying a communications logical channel (B) for the speech data and the signalling logical channel (D). Burst synchronisation is achieved by the asynchronous detection of words in a synchronisation channel (S). These words have bit patterns reducing the probability of incorrect asynchronous detection of them. If one part ceases to receive handset signals from the other, it transmits a special signal, informing the other part. This enables both parts to detect the failure of a link at substantially the same time, so that their actions to re-establish the link are synchronised.
(FR)Un mode de communication adapté pour un système téléphonique sans fil met en ÷uvre la communication radio en duplex à division du temps entre un combiné (11) et un poste de base (3), utilisant des salves alternées de transmission sur un seul canal radio. Une fois qu'une liaison radio a été établie, les transmissions initiales acheminent un canal logique de synchronisation (S) et un canal logique de signalisation (D) multiplexés ensemble, mais la liaison peut passer à des salves acheminant un canal logique de communication (B) pour les données vocales ainsi que le canal logique de signalisation (D). La synchronisation des salves se fait par la détection asynchrone de mots se trouvant dans un canal de synchronisation (S). Ces mots comportent des configurations binaires réduisant la probabilité de leur détection asynchrone incorrecte. Si une des parties cesse de recevoir les signaux du combiné provenant de l'autre partie, elle transmet un signal spécial informant l'autre partie. Cela permet aux deux parties de détecter la défaillance d'une liaison presqu'en même temps, de sorte que leurs mesures pour rétablir la liaison sont synchronisées.
Designated States: AT, AU, BB, BG, BR, CA, CH, DE, DK, ES, FI, GB, HU, JP, KP, KR, LK, LU, MC, MG, MW, NL, NO, RO, SD, SE, SU, US.
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, IT, LU, NL, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CM, GA, ML, MR, SN, TD, TG).
Publication Language: English (EN)
Filing Language: English (EN)