Method of communication between a plurality of remote units...

G - Physics – 01 – S

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G01S 13/76 (2006.01) G01S 13/75 (2006.01) G06K 7/00 (2006.01) G01S 13/82 (2006.01)

Patent

CA 2325423

In a communication system comprising a base station (10) and a plurality of asynchronously operating remote units (20, 22, 24, 26, 28), a method of communication between the base station and each of the remote units includes each remote unit randomly transmitting (208) a first bit pattern to the base unit. Upon detecting the reception of an error-free bit pattern, the base unit transmits (234) an ACK during a first window of time. The remote unit which detects the ACK during a corresponding first window of time becomes the selected unit and thereafter communicates (218) with the base station. All other remote units continue monitoring (214) for the transmission of a command belonging to a first set of commands, afterwhich the selected unit goes into a quiet mode and the unselected units resume their random transmissions of the first bit pattern to the base unit.

La présente invention concerne une méthode de communication entre la station de base (10) et chacune des unités distantes (20, 22, 24, 26, 28), dans un système de communication qui comprend une station de base et une pluralité d'unités distantes opérant de manière asynchrone. Cette méthode comprend l'émission (208) aléatoire, par chaque unité distante, d'un premier schéma de bits vers l'unité de base. A la réception d'un schéma de bits sans erreur, l'unité de base émet (234) un accusé de réception (ACK) pendant la première fenêtre de temps. L'unité distante qui détecte le signal ACK pendant une première fenêtre de temps correspondante devient l'unité choisie et communique (218) par la suite avec la station de base. Toutes les autres unités distantes continuent le suivi (214) d'une émission de commande d'un premier ensemble de commandes, après quoi, l'unité choisie est mise en mode repos et les autres unités reprennent leurs émissions aléatoires de premier schéma de bits vers l'unité de base.

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