Technique for time-division duplex cordless telecommunication

H - Electricity – 04 – J

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H04J 3/06 (2006.01) H04M 1/725 (2006.01) H04M 1/733 (2006.01) H04Q 7/22 (2006.01) H04L 7/04 (2006.01)

Patent

CA 2026107

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.

Un mode de communications adapté pour un système téléphonique sans fil met en oeuvre une communication radio en duplex à division du temps, entre un combiné (11) et un poste de base (3), utilisant des giclées alternées de transmissions 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 giclées acheminant un canal logique de communications B pour les données de parole ainsi que le canal logique de signalisation D. On parvient à la synchronisation des giclées par la détection asynchrone de mots se trouvant dans un canal de synchronisation S. Ces mots comportent des configurations de bits réduisant la probabilité de leur détection asynchrone incorrecte. Si une partie 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 sensiblement en même temps, de sorte que leurs tentatives pour réétablir la liaison sont synchronisées.

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