Interference avoidance technique for wireless networks used in critical applications

摘要

An apparatus is provided that uses the steps of providing a plurality of wireless sensor devices coupled to a controller in a security system configured into a wireless network where at least one is a child sensor device that communicates with the controller through at least first and second parent sensor devices, the child sensor device measuring an environmental parameter within the secured area and transmitting a message to the controller through the at least two parents, the message is transmitted during a first time period and on a first frequency to the first parent and a copy is transmitted during a second time period and on a second frequency to the second parent wherein the first and second times and first and second frequencies are all different and wherein the first and second time periods are directly adjacent to one another in time.

主权项

1. A method for transmitting a message from a wireless sensor device among a plurality of wireless sensor devices configured in a wireless network in a security system, the method comprising:
providing the plurality of wireless sensor devices coupled to a control panel of the security system, the plurality of wireless sensor devices configured into the wireless network that protects a secured area, wherein at least one wireless sensor device of the plurality of wireless sensor devices being a child sensor device that communicates with the control panel through at least first and second parent sensor devices, wherein each of the plurality of wireless sensor devices further comprises a sensor, a repeater or an output device; the child sensor device measuring an environmental parameter within the secured area; and the child sensor device transmitting the message including at least the measured environmental parameter to the control panel through each of the at least first and second parent sensor devices, wherein the message is transmitted using a first channel during a first time period and on a first frequency to the first parent sensor device and a copy of the message is transmitted using a second channel during a second time period and on a second frequency to the second parent sensor device, wherein the first and second time periods and the first and second frequencies are all different, the second time period begins immediately after a conclusion of the first time period; wherein the first channel and the second channel are selected by a registration processor of the child sensor device during a registration process, to include the child sensor device in the wireless network, based on a respective set of channels available of the first and second parent sensor devices for the child sensor device to communicate with the control panel through the first and second parent sensor devices.