Hybrid encoding of data transmissions in a security system

Details Hybrid encoding of data transmissions in a security system Hybrid encoding of data transmissions in a security system

H - Electricity

04

L

H04L 1/22 (2006.01) H04W 28/04 (2009.01) G08B 25/00 (2006.01)

Patent

CA 2573273

A security system in which wireless transmitting security devices use a hybrid or dual encoding methodology, wherein a first part of a data message is encoded in a return-to-zero (RZ) format and a second part of the data message is encoded in a non-return-to-zero (NRZ) format, thereby increasing error detection and correction. In a first aspect of the invention, status information is included in the first part of the message and redundant status information is included in the second part of the message. In a second aspect of the invention, message sequence information is included in the second part of the message to avoid processing of stale or out-of-sequence messages.

L'invention concerne un système de sécurité dans lequel des dispositifs de sécurité de transmission sans fil utilisent un processus de codage hybride ou double. Une première partie d'un message de données est codée dans un format de remise à zéro (RZ) et une seconde partie du message de données est codée dans un format sans remise à zéro (NRZ), augmentant ainsi la détection et la correction d'erreurs. Dans un premier aspect de l'invention, des informations d'état sont comprises dans la première partie du message et des informations d'état redondantes sont comprises dans la seconde partie du message. Dans un second aspect de l'invention, des informations de séquence de message sont comprises dans la seconde partie du message, afin d'éviter le traitement de messages ayant expiré ou hors séquence.

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