Dual site supervision for control channel cellular radio...

H - Electricity – 04 – W

Patent

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Details

H04W 72/04 (2009.01) H04W 72/06 (2009.01) G08B 17/00 (2006.01) G08B 29/00 (2006.01)

Patent

CA 2529924

Dual site supervision is provided for a control channel cellular radio for a fire alarm reporting system that uses logic that causes a control channel cellular transceiver to operate in a nonstandard manner and to use a different and second cellular base station or site that the unit would not normally select operating pursuant to a standard cell phone software module. The logic causes the control channel cellular transceiver to monitor and test through more than one cell base station or site, thereby meeting the dual communication path supervision requirement for UL listed communications systems for stand alone fire alarm reporting systems. The available cellular control channels are first scanned, and the signal strength of each cellular control channel is measured. Then the cellular control channel with the strongest signal strength and the cellular control channel with the second strongest signal strength which are verified as being available for the assigned carrier are selected to report the status of the fire alarm system. A cellular radio message on the status of the fire alarm system is transmitted over the cellular control channel with the strongest signal strength, or if unavailable over the cellular control channel with the second strongest signal strength.

L'invention porte sur une surveillance par deux sites de la radio cellulaire à canaux de commande d'un système d'alarme incendie utilisant une logique qui conduit un émetteur/récepteur cellulaire de canal de commande à fonctionner de manière non usuelle ou à utiliser un deuxième ou différent site ou station de base cellulaire, de manière à ce que l'unité ne choisisse pas normalement d'opérer conformément à un module logique usuel de téléphone cellulaire. Ladite logique amène l'émetteur/récepteur cellulaire de canaux de commande à faire effectuer la surveillance et les tests par plus d'un site ou station de base cellulaire, satisfaisant ainsi aux exigences relatives à la surveillance à double canal de communication s'appliquant aux systèmes de communication à alarme incendie autonome de la liste de l'UL (union des assureurs). On procède à un premier balayage des canaux de commande cellulaires disponibles dont on mesure l'intensité du signal, puis on sélectionne les deux canaux de plus forte intensité, dont on vérifie la disponibilité à transmettre l'état du système d'alarme incendie, puis un message radio cellulaire sur ledit état est émis sur le canal au signal de plus forte intensité, ou s'il n'est pas disponible, sur le deuxième canal sélectionné.

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