Abstract: A method of synchronizing transmission of signals between two nodes in a network that includes at least another cooperating node. After reception of a clear-to-code signal (CTC) from the one node (B), broadcasting a clear-to-send signal (CTS), which contains at least a timing indication, from the cooperating node (C) to the first node (A) and the second node (B). After reception of the clear-to-send signal (CTS) by the first and second nodes (A,B), a first signal (S1) and a second signal (S2) are transmitted, via the cooperating node (C), respectively from the first node (A) to the second node (B) and from the second node (B) to the first node (A) during at least a common time period depending on the timing indication.

Abstract: Methods for an outdoor lighting network (100) are disclosed. The methods can adaptively control lighting requirements based upon traffic in the outdoor lighting network (100). The adaptive control provides illumination over a certain response range based upon detection of an object (20) and in addition possibly a velocity of the object (20) by a lighting unit (LUs 1-8) equipped with a sensor (12) For the outdoor lighting network (100), the disclosed methods include deciding when a control message should be transmitted to other lighting units (LUs 1-8), selecting one or more control messaging protocols with modes adapted to achieve a response range depending on the velocity of the object (20) and controlling behavior of a light level output of the lighting unit (LU 1-8).

Abstract: The present invention relates to a method of detecting a failed luminaire and/or light sensor in a lighting system comprising M luminaires and N light sensors. The elements Dsl of an N×M transfer matrix D expresses how each luminaire l affect a light sensor s with respect to sensed light intensity, wherein s=1, 2, . . . N, and l=1, 2, . . . , M.

Abstract: A method and device for visible light communication is disclosed. The method comprises selecting a first sequence and a second sequence of light intensity frequencies to represent a first symbol and a second symbol, respectively, for embedding data. The method comprises further transmitting a light signal. The light signal comprises time periods in which a light intensity of the light signal is sequentially controlled according to the selected sequence of light intensity frequencies. Thereby, a frequency hopping light signal is generated, in which data may be embedded. The light signal may be generated and transmitted by the device comprising a light emitter.

Abstract: Method for transmitting data from a resource-constrained transmitter to a receiver in a wireless network, comprising the following steps:—the resource-constrained transmitter (21a, 21b, 21c) sending a channel request message to the receiver,—in response to the request, the receiver (22) determining communication channel availability based on the result of a sensing step and broadcasting channel information,—the resource-constrained transmitter (21a, 21b, 21c) listening to the information and transmitting data on the corresponding channel, wherein the sensing step is performed by the receiver before or after receiving channel request from the transmitter. The invention also relates to a wireless network.

Abstract: A method of calibrating an output of a light sensor for use in controlling a lighting system comprising at least one lighting device. The method comprises placing the lighting system into each of a plurality of discrete modes, each mode being configured to output a different respective configuration of light, wherein in operation each mode will automatically vary an output illumination level of the respective configuration based on the output of the light sensor in response to a changing light level in an environment being illuminated. The method further comprises performing a plurality of calibrations by determining a respective calibration setting for calibrating the output of the light sensor in each of the modes, and setting each mode to vary the output illumination level based on the output of the light sensor as calibrated by the respective calibration setting.

Abstract: The invention relates to a method for communication between nodes in a wireless network further comprising a router node (2), comprising : a first (1) and second (3) transmitting nodes sending a first (a(t)) and second (b(t))data signals to be respectively transmitted to a first (4) and second (5) receiving nodes, the router node (2) receiving a mixed signal (MDATA[a,b](t)) resulting from interference of the first (a(t)) and second (b(t)) data signals, and sending respectively to the first (4) and second (5) receiving nodes a first and second router analog acknowledgment signals comprising information representative of the hearing duration during which the mixed signal has been received by the router node, the router node (2) sending the mixed signal(MDATA[a,b](t)) to the first (4) and the second (5) receiving nodes, the first (4) and second (5) receiving nodes decoding the mixed signal, based on the respective router analog acknowledgment signals.

Abstract: The invention is based on the idea that a lighting system can utilize its sensing and control functionalities to offer dynamic load management (e.g. demand response) services in an electrical grid. The present invention optimizes dimming levels of lighting sources of a lighting system by determining a solution for an optimization problem directed to determining new dimming levels such that power consumption of the lighting devices is reduced. During the determining the solution for the optimization problem, the present invention may take into account specific guarantees on illumination rendering, acceptable to different users, and differing illumination requirements in different spaces or rooms. By the lighting control of the present invention, predictable and effective load reductions may be achieved.

Abstract: Presence adaptive lighting control strategies are known to be very effective in reducing energy consumption in buildings. Ultrasonic array sensors have been proposed for reliable presence sensing. Systems and methods are disclosed by which additional sensing functionalities may be enabled for providing new control functions, with the array sensor as basic sensing platform. In particular, hybrid sensing that combines portable sensors (possibly, user enabled) and fixed-infrastructure sensors is considered. Applications are, for example, active presence sensors in lighting control applications.

Abstract: A control unit (9) for controlling luminance in a space (3), wherein the control unit is configured to estimate a three-dimensional location of at least one target (8) as a function of time, and control the luminance in the space based on the estimated three-dimensional location of the at least one target.

Abstract: The present invention relates to a method, an apparatus and a computer program product for sensing and communicating in transmission systems with shared spectrum usage, which may comprise e.g. a cognitive relay system. The communication between a transmitter and a receiver occurs in two transmission phases via the assistance of a relay. Sensing is performed at the transmitter during the second transmission phase, thus overcoming the need for dedicated slots for sensing.

Abstract: A network of active sensors in a control system is considered. The active sensors, which may be fixed-infrastructure sensors, provide presence detection information to a distributed lighting system. The active sensors communicate by transmitting probe signals. The communication of probe signals may result in cross-interference which may vary in time. Cross-interference is detected, and can later be avoided, by determining a difference between signals received in a first part of a timeslot and signals received in a second part of the timeslot. In order to do so probe signals comprising two non-zero pulses are transmitted in respective parts of the timeslot. Applications are, for example, active presence sensors in lighting control applications in indoor as well as outdoor environments.

Abstract: A configuration unit (1) and a method for configuring a sensor (2) comprising a transmitter (4) and a plurality of receivers (6) are provided. The configuration unit is operatively connected to the transmitter and the plurality of receivers, and is adapted to estimate the location of a static element (8) based on a probing signal (5) transmitted by the transmitter and based on a return signal (7) received by the plurality of receivers. The return signal is generated by reflection of the probing signal against the static element. Moreover, the configuration unit is adapted to configure the sensor, for presence detection of a target (9), based on the estimated location of the static element.

Abstract: A method of calibrating an output of a light sensor for use in controlling a lighting system comprising at least one lighting device. The method comprises placing the lighting system into each of a plurality of discrete modes, each mode being configured to output a different respective configuration of light, wherein in operation each mode will automatically vary an output illumination level of the respective configuration based on the output of the light sensor in response to a changing light level in an environment being illuminated. The method further comprises performing a plurality of calibrations by determining a respective calibration setting for calibrating the output of the light sensor in each of the modes, and setting each mode to vary the output illumination level based on the output of the light sensor as calibrated by the respective calibration setting.

Abstract: Methods for an outdoor lighting network (100) are disclosed. The methods can adaptively control lighting requirements based upon traffic in the outdoor lighting network (100). The adaptive control provides illumination over a certain response range based upon detection of an object (20) and in addition possibly a velocity of the object (20) by a lighting unit (LUs 1-8) equipped with a sensor (12) For the outdoor lighting network (100), the disclosed methods include deciding when a control message should be transmitted to other lighting units (LUs 1-8), selecting one or more control messaging protocols with modes adapted to achieve a response range depending on the velocity of the object (20) and controlling behavior of a light level output of the lighting unit (LU 1-8).

Abstract: Presence adaptive lighting control strategies are known to be very effective in reducing energy consumption in buildings. Ultrasonic array sensors have been proposed for reliable presence sensing. Systems and methods are disclosed by which additional sensing functionalities may be enabled for providing new control functions, with the array sensor as basic sensing platform. In particular, hybrid sensing that combines portable sensors (possibly, user enabled) and fixed-infrastructure sensors is considered. Applications are, for example, active presence sensors in lighting control applications.

Abstract: According to the invention, a PIR sensor system (100) comprises a first PIR sensor (1) associated with a first sensing region (11) and a second PIR sensor (2) associated with a second sensing region (12). The first and second sensing regions partially overlap and are divided into detection cells (46a-46f) and (45a-45d). Each detection cell is represented by predetermined characteristics of first and second output signals, which signals are based on input signals from first and second sensing elements (4-7) of each PIR sensor. Thereby different detection cells are encoded by a certain combination of signal characteristics (amplitude and sign) of the first and second output signals. Further, the PIR sensor system comprises a processing unit (15) configured to associate the characteristics of the first and second output signals with one of the detection cells for determining in which of the detection cells a heat source is positioned.

Abstract: A method and device for visible light communication is disclosed. The method comprises selecting a first sequence and a second sequence of light intensity frequencies to represent a first symbol and a second symbol, respectively, for embedding data. The method comprises further transmitting a light signal. The light signal comprises time periods in which a light intensity of the light signal is sequentially controlled according to the selected sequence of light intensity frequencies. Thereby, a frequency hopping light signal is generated, in which data may be embedded. The light signal may be generated and transmitted by the device comprising a light emitter.

Abstract: The present invention relates to a method of detecting a failed luminaire and/or light sensor in a lighting system comprising M luminaires and N light sensors. The elements Dsl of an N×M transfer matrix D expresses how each luminaire l affect a light sensor s with respect to sensed light intensity, wherein s=1, 2, . . . N, and l=1, 2, . . . , M.

Abstract: A network of active sensors in a control system is considered. The active sensors, which may be fixed-infrastructure sensors, provide presence detection information to a distributed lighting system. The active sensors communicate by transmitting probe signals. The communication of probe signals may result in cross-interference which may vary in time. Cross-interference is detected, and can later be avoided, by determining a difference between signals received in a first part of a timeslot and signals received in a second part of the timeslot. In order to do so probe signals comprising two non-zero pulses are transmitted in respective parts of the timeslot. Applications are, for example, active presence sensors in lighting control applications in indoor as well as outdoor environments.