WO2012175104A1 - Dispositif et procédé pour l'émission et la réception de signaux radio - Google Patents

Dispositif et procédé pour l'émission et la réception de signaux radio Download PDF

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Publication number
WO2012175104A1
WO2012175104A1 PCT/EP2011/060188 EP2011060188W WO2012175104A1 WO 2012175104 A1 WO2012175104 A1 WO 2012175104A1 EP 2011060188 W EP2011060188 W EP 2011060188W WO 2012175104 A1 WO2012175104 A1 WO 2012175104A1
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WO
WIPO (PCT)
Prior art keywords
activation
signals
signal
devices
activation signals
Prior art date
Application number
PCT/EP2011/060188
Other languages
German (de)
English (en)
Inventor
Martin Meyer
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/EP2011/060188 priority Critical patent/WO2012175104A1/fr
Publication of WO2012175104A1 publication Critical patent/WO2012175104A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0235—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a power saving command
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates to a device and a method for transmitting and receiving radio signals and a system of a plurality of such devices.
  • the device has a transceiver unit for transmitting and receiving radio signals.
  • the transceiver unit is in particular for
  • the device has a receiving unit for receiving radio signals, which is designed to receive activation signals.
  • the device has activation means for activating the device upon receipt of an activation signal.
  • a known embodiment of such a device are battery-operated radio sensors interconnected in a network.
  • the lowest possible energy consumption is sought in order to achieve the longest possible service life of the batteries.
  • US Pat. No. 7,319,867 B2 describes a method and a device for the wireless control of components of a network.
  • a signal is sent to components of the network via the wireless network, which causes the components to alternate with the compo nents ⁇ devices connected between an active and a passive state.
  • the invention has for its object to facilitate the activation of devices for transmitting and receiving radio signals.
  • a device for transmitting and receiving radio signals comprising: a transceiver unit for transmitting and receiving radio signals, which is designed both for transmitting a data signal and for transmitting an activation signal,
  • a receiving unit for receiving radio signals which is designed to receive activation signals, synchronization means for synchronizing the transmission of the activation signals,
  • Activation means for activating the device upon receipt of an activation signal.
  • This object is also achieved by a method for transmitting and receiving radio signals, in which by means of a device
  • Radio signals are sent and received, with both data signals and Aktiv istssig ⁇ signals are sent as radio signals,
  • the activation signals are sent synchronized in time
  • the device is activated upon receipt of an activation signal.
  • the object is achieved by a system which consists of a plurality of such devices, wherein at least a part of the devices can be activated upon receipt of activation signals emitted by at least one of the plurality of devices.
  • the invention is based on the realization that not only the increase in the transmission power of a single transmitter comes to the raised stabili ⁇ hung the field strength of radio signals in question, but also the number of transmitters, which each transmit only with a low transmission power can be increased. If these transmitters are synchronized in time, this results in
  • the device accordingly may temporally synchronized activation signals are sent out. These activation signals are transmitted by a transceiver unit for transmitting and receiving radio signals.
  • the device according to the invention has a further unit for receiving radio signals, the receiving unit, which is designed to receive activation signals.
  • This receiver unit thus serves the Emp ⁇ start of activation signals, which can be emitted for example from other inventive devices.
  • the receiving unit is designed in such a way that it is ready to receive even when the device is deactivated.
  • the receiving unit is an additional Empfangsein ⁇ ness, not the receiving part of the transceiver unit. According to the invention, the device can therefore be activated upon receipt of an activation signal with the aid of activating means.
  • the device has a sensor and / or an actuator, wherein the data signal sensor data and / or actuator data includes.
  • the device can be used in particular as a sensor or actuator ⁇ in a wireless sensor or Aktornetzwerk.
  • the synchronization means to a microcontroller and a timer unit.
  • the microcontroller serves to control the synchronization of the transmission of the activation signals.
  • the microcontroller accesses the timer unit so that a time synchronization is possible absolutely or relative to other devices and units of a system.
  • synchronous is thus meant at the same time.
  • the carriers of the activation signals need not be phase-locked coupled.
  • a synchronization of the transmission of the activation signals is carried out according to a further advantageous embodiment of the invention in a particularly simple manner, when the synchronization means are designed such that the transmission of the activation signals during a predetermined
  • Duration takes place.
  • the devices themselves emit an activation signal after receiving an activation signal for one second.
  • the receiving unit is designed to operate self-sufficient energy.
  • the data signal and the activation signal in the same frequency ⁇ range.
  • this offers advantages when data signal and activation signal sent over by the transceiver unit and the receiving unit shared antennas ⁇ to. It also has the advantage that data signal and activation signal in a similar way wide of ⁇ in space.
  • the transmitting receiving unit for communica tion with ⁇ a higher-level interworking unit is vorgese ⁇ hen.
  • the device has demodulation means for demodulation of pulse-modulated activation signals.
  • demodulation means for demodulation of pulse-modulated activation signals.
  • pulse-modulated activation signals can be transmitted in particular simple messages or information to a device.
  • 1 shows a device for transmitting and receiving
  • FIGS. 2 to 4 show a network with several devices for
  • 5 shows a network with several devices for
  • Wireless sensors consume energy both when transmitting and receiving. Therefore, usually the transmitter of a wireless sensor is not constantly active, but only periodically or when the sensor part detects an event that needs to be sent. Periodically switching on the receiver is almost always unnecessary and is rarely actually used for data transmission to the wireless sensor. If a system is out of service for a long time, eg. B. overnight or during the plant holidays, so the periodic switching is unnecessary and causes unwanted energy consumption. To avoid these disadvantages, solutions are conceivable in which the radio sensors have an additional radio receiver, wel rather an extremely low power consumption or even purely passive working. The power consumption of such an additional radio receiver in such a case is, for example, less than one thousandth of the power consumption of the sensor network receiver of the radio sensor.
  • a sol ⁇ ches additional radio system is also known as Wake-On-Radio (WOR).
  • This additional radio system differs in its properties, eg. B. Sensitivity, data rate, Modu ⁇ lationsart clearly from the properties of the sensor network and only serves to send a short information to one, several or all wireless sensors in the network, without having to turn on their receiver.
  • a WOR is therefore optimized for the lowest possible bathauf ⁇ acquisition of the receiver, which is for example only, a simpler detector receiver.
  • the transmitter of a WOR is usually not battery operated, but as well as the gateway of a radio sensor network stationary and connected with cables to higher-level power and data networks.
  • the WOR signal generated by WOR need not be modulated in its simplest form.
  • Trä ⁇ ger for example, a 2.4 GHz oscillator on.
  • This signal is detected by the WOR receivers which represents ⁇ aufhin turn on the respective associated radio sensor.
  • the WOR signal can also be modulated in order to transmit data and thus specifically wake certain radio sensors.
  • the modulation must be easy to demodulate, suitable are pulse modulations in which only one carrier is turned on, z. B. on-off keying and pulse width modulation. If the WOR signal is not modulated, all WOR receivers in range will always recognize the signal and turn on their wireless sensor.
  • the transmitter of a WOR is a central device, which should reach all radio sensors in a plant. This usually leads to the following prob lem ⁇ .
  • the range of a WOR is usually lower than that of the actual radio system. This is mainly due to the lower sensitivity of the WOR receiver.
  • under ⁇ the network coverage of the WOR of the coverage of the wireless sensor network is deposited, in particular because of the pronounced Field strength fluctuations in industrial plants, also called fading.
  • the WOR and the wireless sensor network ⁇ factory use the same frequency range. It is thus by no means certain that in an otherwise functioning radio sensor network all subscribers can actually be reached by the signal of a WOR transmitter.
  • the radio sensor network is at the limits of its range, there is a risk that a WOR will not work. This can be done, for example, with a sensor network operating at 2.4 GHz and supplemented with a WOR at 800 MHz. In this case, the range of the sensor radio system to over 100 m is, while the range of the WOR only 10 meters be wearing ⁇ .
  • the frequency of the WOR is deliberately not chosen at 2.4 GHz, because there the allowable power of the WOR is less due to EMC regulations. At 2.4 GHz, the range would be even lower.
  • the device has a transceiver unit 1 for transmitting and receiving radio signals 11, 12.
  • the device also has a receiving unit 2 for receiving radio signals 10.
  • the receiving unit 2 is also WOR receiver ge ⁇ Nannt.
  • Further components of the device are synchronization means 3 and activation means 4.
  • the device also has a sensor 5 and / or actuator 5.
  • the synchronization means 3 may comprise a microcontroller 6 and a timer unit 7.
  • the device may comprise demodulation means 8 for demodulation of pulse-modulated activation signals.
  • the device has a power supply 9 and antennas 13, 14.
  • the device is in a deactivated state.
  • a state in which the essential units of the device record either no power or only a very low power is designated as a deactivated state.
  • this state of the units is also referred to as idle state or as standby mode.
  • Parts of the device may be in a passive state, that is, they do not absorb any power.
  • the receiving unit 2 would be in such a state.
  • An activation signal is also referred to as a WOR signal.
  • the transported ⁇ benefited from the radio signal energy, as an electromagnetic wave which the
  • Antenna reached is received in the receiving unit 2 and received.
  • the receiving unit 2 is in such a way ⁇ forms that it is able to receive radio signals even in passive, ie powerless operation.
  • An example of such a receiving unit designed for energy self-sufficient operation is a simple detector receiver, which is essentially a resonant circuit with rectifier connected between antenna and ground.
  • the signal received by the receiving unit 2 activation signal is converted by the reception ⁇ unit 2 into an electrical signal which Removing sufficient to stimulate the activation means to activate the device.
  • Under activation is understood to mean the displacement of the device from a power-free or low-power operating state into the normal operating state. This can be done, for example, by generating an interrupt in a microcontroller 6 of the device.
  • the microcontroller 6 By the converted into an electric signal activating signal ⁇ he testified interrupt causes the microcontroller 6 from the rest ⁇ state to the normal operating state to change.
  • the A ⁇ units of the apparatus are powered by a power supply 9 with energy, in particular in the normal Radiozu ⁇ stand.
  • the receiving unit 2 can be connected to this power supply 9, indicated in FIG. 1 by the dashed line, or the receiving unit 2 can operate purely passive, ie without an external power supply.
  • the device according to the exemplary embodiment according to FIG. 1 has a sensor 5, the sensor data via the transmission-receiving unit 1 as a data signal by means of a radio signal
  • the receiving unit 2 and the transceiver unit 1 each have their own antenna 13 or 14.
  • the receiving unit 2 and the transceiver unit 1 can also receive and transmit and receive via a single common antenna. This is possible, in particular, when the transmitting ⁇ receiving unit 1 and the receiving unit 2 send or receive signals in a same or nearby frequency range.
  • the device can also be used to control a
  • Actuator 5 can be used.
  • the actuator data is also received or transmitted via the transceiver unit.
  • the timer unit 7 may be, for example, a quartz-controlled timer module.
  • the synchronization means 3, the activa ⁇ agent 4, the timer unit 7 and the demodulation onsstoff 8 may as shown in FIG 1, as also be implemented as components of the microcontroller 6, both as separate units. According to the exemplary embodiment shown, these units communicate in part with each other and with the microcontroller 6 or are controlled by it.
  • FIGS. 2, 3 and 4. 2 shows a network whose devices are in the idle state.
  • the WOR Sen ⁇ the 20 sends at the time shown in Figure 2, activation signals 40. These activation signals 40 are also referred to as WOR signal. Because of the limited
  • the activation signals 41 sent by the devices 21 reach the nearest devices, which are designated by the reference numeral 22.
  • the devices 21 are synchronized in time such that the activation signals 41 are sent at least temporarily at the same time. Characterized the voltage applied to the antennas of a respective device 22 field strength is increased, as the field strengths of the individual being end ⁇ th, overlapping activation signals 41 sum in the best case.
  • the awakened in the preceding step devices message 22 further activation signals 42 which are used to Ak ⁇ tivtechnik of the device 23 shown in FIG. 4
  • both the central WOR transmitter 20 and the already awakened devices 21 and 22 at least temporarily transmit the activation signals 40, 41 and 42 at the same time, so that in total the field strength at the antenna of the device 23 increases.
  • the WOR transmitter 20 can initially wake only the devices 21 within its range. Possibly, but not necessarily to ⁇ together with the WOR transmitter 20 - - in the next step or in the next steps according to Figures 3 and 4, this awakened devices simultaneously generate a renewed activation signal. This will be more, still sleeping Devices awakened.
  • This step may be repeated with all or some alert devices until all devices are awake.
  • 5 shows a system of devices 21, 22, 23 in which the devices 21 and 22 are already woken up.
  • the double arrows indicate that the devices 21, 22 can communicate with one another.
  • the devices 21, 22 can also communicate with a higher-level interworking unit 30.
  • Such a gateway unit 30 is commonly referred to as a gateway.
  • the awakened devices thus communicate with each other via the wireless network, and usually also with the gateway connected to a higher level network. In this case, information about the state of the system can be exchanged and the wake-up process can be controlled by the gateway. Also, so the clocks of the devices can be synchronized. In the simplest case, no data is transmitted with the activation signal.
  • the transmitters of the devices need only be turned on for some time, e.g. For ten milliseconds.
  • the on and off does not necessarily happen at the same time, but all stations must send for a while at the same time to produce the desired high transmit power ⁇ .
  • This process can be controlled by the gateway via the wireless network.
  • the gateway sends a command to switch it on via the wireless network, and after a while also a switch-off or the devices switch off their activation signal after some time.
  • the enable signals must be turned on and off simultaneously for the WOR receivers to recognize the pulses.
  • the simultaneity but can be seen in relation to the data rate of the impulsmodulier ⁇ th signal, for example, at 10 to 100 bits per second. These low requirements can also be controlled by the gateway.
  • the central WOR transmitter 20 is not absolutely necessary, the wake-up process can also be triggered by a device.
  • Decisive is the synchronous transmission of the WOR signal from several transmitters. This is not possible with other radio systems (eg IEEE 802.15.4, ZigBee, WLAN, Bluetooth, mobile radio, RFID, radio, DCF77) because of their modulation types.
  • radio systems eg IEEE 802.15.4, ZigBee, WLAN, Bluetooth, mobile radio, RFID, radio, DCF77
  • the invention Since send multiple channels, the radiated power is the total ⁇ higher and the coverage is improved radio ⁇ holes are avoided. Since the performance of a single transmitter is often limited by EMC regulations, the invention provides an elegant solution for increasing network coverage while maintaining relevant EMC regulations.
  • the transmission channel of a typical WOR signal is frequently disturbed by interferences on account of the usually used high frequency (eg 2.4 GHz) and of the multipath reception always present in factories (reflections on walls and objects).
  • a transmission line "line of sight" or only with free first Fresnel zone will occur only rarely.
  • the antenna directional diagram must also be taken into account.
  • the WOR carrier frequency signals When a WOR signal is generated by multiple transmitters simultaneously, the WOR carrier frequency signals also arrive at the receivers at different phase angles. This inevitably leads to interference, even if no multiple reflections take place as described above. If this results in an erasure, only one or more transmitters need to be turned off to increase the level of the WOR carrier frequency signal at the receiver. This can also be controlled by the gateway of the radio sensor network. In addition, the carrier frequencies of the WOR transmitters always differ minimally (eg with IEEE802.15.4 max.
  • the invention thus relates to a device and a method for transmitting and receiving radio signals, as well as a system of a plurality of such devices.
  • the device has a transceiver unit 1 for transmitting and receiving radio signals, which are both for transmitting a Data signal as well as for transmitting an activation signal is formed, a receiving unit 2 for receiving radio signals, which is adapted to receive activation signals, synchronization means 3 for synchronizing the timing of sending the activation signals and activating means 4 for activating the device upon receipt of an activation signal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif et un procédé pour l'émission et la réception de signaux radio, ainsi qu'un système comprenant plusieurs de tels dispositifs. Le dispositif comprend un ensemble émetteur-récepteur (1), pour l'émission et la réception de signaux radio, qui est configuré aussi bien pour l'émission d'un signal de données, que pour l'émission d'un signal d'activation, une unité de réception (2) pour la réception de signaux radio, qui est configurée pour la réception de signaux d'activation, un moyen de synchronisation (3), pour la synchronisation temporelle de l'émission des signaux d'activation, ainsi qu'un moyen d'activation (4), pour l'activation du dispositif, lors de la réception d'un signal d'activation.
PCT/EP2011/060188 2011-06-20 2011-06-20 Dispositif et procédé pour l'émission et la réception de signaux radio WO2012175104A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/060188 WO2012175104A1 (fr) 2011-06-20 2011-06-20 Dispositif et procédé pour l'émission et la réception de signaux radio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/060188 WO2012175104A1 (fr) 2011-06-20 2011-06-20 Dispositif et procédé pour l'émission et la réception de signaux radio

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WO2012175104A1 true WO2012175104A1 (fr) 2012-12-27

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2421153A (en) * 2004-12-09 2006-06-14 Itt Mfg Enterprises Inc Energy efficient medium access control protocol and system for sensor networks
US7319867B2 (en) 2003-09-15 2008-01-15 Atheros Communications, Inc. Method and apparatus for wake on wireless systems
US20090129306A1 (en) * 2007-02-21 2009-05-21 Terahop Networks, Inc. Wake-up broadcast including network information in common designation ad hoc wireless networking
WO2009078575A1 (fr) * 2007-12-17 2009-06-25 Electronics And Telecommunications Research Institute Appareil et procédé de réveil pour un nœud de capteur à faible consommation
US20100150042A1 (en) * 2008-12-15 2010-06-17 Electronics And Telecommunications Research Institute Apparatus and method of transmitting and receiving wake-up signal
DE102009047199A1 (de) * 2009-11-26 2011-06-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Eine Datenübertragungsvorrichtung und ein Verfahren zum Aktivieren einer Datenübertragung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7319867B2 (en) 2003-09-15 2008-01-15 Atheros Communications, Inc. Method and apparatus for wake on wireless systems
GB2421153A (en) * 2004-12-09 2006-06-14 Itt Mfg Enterprises Inc Energy efficient medium access control protocol and system for sensor networks
US20090129306A1 (en) * 2007-02-21 2009-05-21 Terahop Networks, Inc. Wake-up broadcast including network information in common designation ad hoc wireless networking
WO2009078575A1 (fr) * 2007-12-17 2009-06-25 Electronics And Telecommunications Research Institute Appareil et procédé de réveil pour un nœud de capteur à faible consommation
US20100150042A1 (en) * 2008-12-15 2010-06-17 Electronics And Telecommunications Research Institute Apparatus and method of transmitting and receiving wake-up signal
DE102009047199A1 (de) * 2009-11-26 2011-06-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Eine Datenübertragungsvorrichtung und ein Verfahren zum Aktivieren einer Datenübertragung

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