Link establishment in a system for monitoring the structural integrity of a building
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Abstract
A system for monitoring the structural integrity of a building uses a frequency hopping spread spectrum (FHSS) hunt protocol to establish a digital communication link between a sensor and other nodes of the system. The sensor'"'"'s role in the FHSS hunt protocol is limited, thereby minimizing the sensor'"'"'s power consumption and extending its battery life. Installer devices and gateways in the system are adapted to continuously perform a first sequence including transmitting a HELLO signal and listening for an ACK signal responsive to the HELLO signal, while a sensor is adapted to selectively perform a second sequence including listening for the HELLO signal and transmitting the ACK signal.
39 Citations
57 Claims
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1-30. -30. (canceled)
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31. A monitoring system, comprising:
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a node adapted to transmit a broadcast signal; and
a sensor adapted to respond to the broadcast signal only when the sensor has determined autonomously to establish communication with the node. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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- 43. A gateway for a monitoring system, comprising logic adapted to perform in sequence on each of a plurality of frequency channels the steps of transmitting a broadcast signal and listening for a response to the broadcast signal from a sensor that has determined autonomously to establish communication with the gateway.
- 51. A sensor for a monitoring system, comprising logic adapted to determine autonomously to establish communication with a gateway and, in response to an autonomous determination to establish communication with the gateway, listen in sequence on a plurality of frequency channels for a broadcast signal from the gateway and transmit a response to the broadcast signal.
Specification