Wirless communication system with collision avoidance protocol

H - Electricity – 04 – W

Patent

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Details

H04W 80/00 (2009.01) H04W 84/18 (2009.01)

Patent

CA 2604479

A system of wireless infrastructure nodes are communicatively coupled to a number of internally powered leaf nodes. The leaf nodes may have sensors and/or actuators. A wireless leaf node transmits data to an infrastructure node at a time according to a duty cycle. When a collision occurs, the data is retransmitted until an acknowledgement is received from an infrastructure node. A change in a transmission protocol parameter, such as duty cycle / phase of sampling is initiated with such retransmissions. A decision to change the parameter is taken either by the wireless leaf node itself, or by an infrastructure node. Some of the leaf nodes can be transmit-only devices which repeat each data packet a number of times.

Selon l'invention, un système de noeuds d'infrastructure sans fil est couplé de façon communicative à un certain nombre de noeuds feuille à alimentation interne. Les noeuds feuille peuvent comprendre des capteurs et/ou des actionneurs. Un noeud feuille sans fil transmet des données à un noeud d'infrastructure à la fois, conformément à un cycle d'utilisation. Lorsqu'une collision a lieu, les données sont retransmises jusqu'à ce qu'un accusé de réception envoyé par un noeud d'infrastructure soit reçu. Un changement de paramètre de protocole de transmission, tel qu'un cycle d'utilisation/phase d'échantillonnage est initié avec lesdites retransmissions. Une décision de changer le paramètre est prise soit par le noeud feuille sans fil lui-même, soit par un noeud d'infrastructure. Certains noeuds feuille peuvent être des dispositifs d'émission qui répètent chaque paquet de données un certain nombre de fois.

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