ASSOCIATION OF A PORTABLE SENSOR DEVICE IN A BUILDING MANAGEMENT SYSTEM
First Claim
1. A method for associating a portable sensor device with a stationary control device in a building management system comprising a plurality of stationary control devices being connected in a network, and a portable sensor device being associated with one of the stationary control devices, wherein the portable sensor device in a first mode transmits a signal occurring at a first frequency to its associated stationary control device so as to provide its associated stationary control device with sensor data, the method comprising:
- detecting a movement of the portable sensor device, whereby the portable sensor device changes from the first mode to a second mode in which the portable sensor device transmits a signal occurring at a second frequency being larger than the first frequency;
receiving the signal transmitted by the portable sensor device occurring at the second frequency by at least one of the stationary control devices, wherein the received signal at each of the receiving stationary control devices is associated with a received signal strength;
determining if the received signal strength of each of the receiving stationary control devices is essentially constant during a time window, thereby determining if the movement of the portable sensor device has stopped; and
in case the received signal strength of each of the receiving stationary control devices is essentially constant during a time window, associating the portable sensor device with the stationary control device having the highest received signal strength, whereby the portable sensor device returns to the first mode.
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Accused Products
Abstract
There is provided a building management system and a method for associating a portable sensor device with a stationary control device in such a system. Upon detection of a movement of the portable sensor device, the portable sensor device starts to transmit signals more frequently to the stationary control devices. It is determined that the movement of the portable sensor device has stopped if the signal strength of the transmitted signals received at the stationary control devices is essentially constant during a time window. In response to such a determination, the portable sensor device is associated with the stationary control device having the highest received signal strength and the portable sensor device returns to an energy-saving mode.
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Citations
15 Claims
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1. A method for associating a portable sensor device with a stationary control device in a building management system comprising a plurality of stationary control devices being connected in a network, and a portable sensor device being associated with one of the stationary control devices, wherein the portable sensor device in a first mode transmits a signal occurring at a first frequency to its associated stationary control device so as to provide its associated stationary control device with sensor data, the method comprising:
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detecting a movement of the portable sensor device, whereby the portable sensor device changes from the first mode to a second mode in which the portable sensor device transmits a signal occurring at a second frequency being larger than the first frequency; receiving the signal transmitted by the portable sensor device occurring at the second frequency by at least one of the stationary control devices, wherein the received signal at each of the receiving stationary control devices is associated with a received signal strength; determining if the received signal strength of each of the receiving stationary control devices is essentially constant during a time window, thereby determining if the movement of the portable sensor device has stopped; and in case the received signal strength of each of the receiving stationary control devices is essentially constant during a time window, associating the portable sensor device with the stationary control device having the highest received signal strength, whereby the portable sensor device returns to the first mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A building management system, comprising
a plurality of stationary control devices being connected in a network; -
a portable sensor device being arranged to be associated with one of the stationary control devices, wherein the portable sensor device has a first mode in which it is arranged to transmit a signal occurring at a first frequency to its associated stationary control device so as to provide its associated stationary control device with sensor data, and a second mode in which it is arranged to transmit a signal occurring at a second frequency being larger than the first frequency to at least one of the stationary control devices; a motion detector arranged to detect a movement of the portable sensor device, wherein the portable sensor device is arranged to change from the first mode to the second mode upon a detection of a movement, wherein the plurality of control devices are arranged to receive the signal transmitted by the portable sensor device occurring at the second frequency, and wherein the received signal at each of the receiving stationary control devices is associated with a received signal strength; and a processing unit arranged to determine if the received signal strength of each of the receiving stationary control devices is essentially constant during a first time window, thereby being arranged to determine if the movement of the portable device has stopped, to associate the portable sensor device with the stationary control device having the highest received signal strength in case the received signal strength of each of the receiving stationary control devices is essentially constant during a first time window, and to instruct the portable sensor device to return to the first mode. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification