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WO2009044368A2 - Procédé et système d'activation d'un dispositif de communications sans fil - Google Patents

Procédé et système d'activation d'un dispositif de communications sans fil Download PDF

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Publication number
WO2009044368A2
WO2009044368A2 PCT/IB2008/054042 IB2008054042W WO2009044368A2 WO 2009044368 A2 WO2009044368 A2 WO 2009044368A2 IB 2008054042 W IB2008054042 W IB 2008054042W WO 2009044368 A2 WO2009044368 A2 WO 2009044368A2
Authority
WO
WIPO (PCT)
Prior art keywords
wakeup
wireless
detection circuit
timeslots
power mode
Prior art date
Application number
PCT/IB2008/054042
Other languages
English (en)
Other versions
WO2009044368A3 (fr
Inventor
Salvatore Drago
Fabio Sebastiano
Dominicus Martinus Wilhelmus Leenaerts
Lucien Johannes Breems
Original Assignee
Nxp B.V.
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 Nxp B.V. filed Critical Nxp B.V.
Publication of WO2009044368A2 publication Critical patent/WO2009044368A2/fr
Publication of WO2009044368A3 publication Critical patent/WO2009044368A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0287—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level changing the clock frequency of a controller in the equipment
    • H04W52/029—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level changing the clock frequency of a controller in the equipment reducing the clock frequency of the controller
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] 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
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • 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 present invention relates generally to implementing a wakeup scheme in a plurality of networked wireless devices.
  • Wireless Sensor Networks include autonomous devices (often referred to as nodes) that are spatially distributed to collect data from the environment and to deliver them to the final user.
  • nodes For self-powered wireless sensors, reducing power consumption can be an important design constraint.
  • a node typically sends and receives a packet of hundreds of bits in a period ranging from seconds to some minutes. Consequently, for nodes that do not reduce power consumption during idles states, the biggest fraction of the energy in each node is spent in idle listening to the channel (e.g., waiting for packets).
  • Other key aspects are the reduced size and the very small cost of the nodes, which directly lead to the need of a complete integration of components into the nodes.
  • Various aspects of the present invention are directed to methods and arrangements for implementing processor power state transitions in a manner that addresses and overcomes the above-mentioned issues.
  • the present invention is directed to a wireless device for use in a wireless network having wireless devices communicating during respectively-designated timeslots according to a TDMA protocol.
  • the wireless device includes a wireless transceiver that communicates over the wireless network during designated timeslots according to the TDMA, and that is operative in a reduced power mode during other timeslots.
  • the wireless device further includes a wakeable wakeup detection circuit, synchronous with the device-designated TDMA timeslots to transition out of a reduced power mode, to detect valid signals during at least one of the device-designated TDMA timeslots and, in response thereto, to prompt the wireless transceiver to transition out of its reduced power mode and communicate over the wireless network.
  • the present invention is directed to a wireless device for use in a wireless network having multiple such wireless devices that communicate using a TDMA protocol.
  • the wireless device includes a wireless transceiver having an active mode for communicating and a reduced power mode, a signal processing circuit for processing communications, and a wakeup detection circuit.
  • the wakeup detection circuit is regulated by a duty cycle so that the wakeup detection circuit is responsive to a device wakeup request during a timeslot in which the wireless transceiver is allowed by the TDMA protocol to receive communications.
  • the wakeup detection circuitry prompts the wireless transceiver to transition from the reduced power mode to the active mode in response to the device wakeup request.
  • the present invention is directed to a method for use in a wireless network having multiple wireless devices that communicate using a TDMA protocol, each wireless device having a wakeup signal detection circuit.
  • the method includes placing a wireless device in a reduced power mode, duty-cycling the wakeup signal detection circuit so that the wakeup signal detection circuit monitors for a device wakeup request during timeslots in which the wireless device is allowed by the TDMA protocol to receive communications, and in response to the wakeup signal detection circuit receiving the device wakeup request, restoring the wireless device from the reduced power mode to a communications power mode.
  • FIG. 1 is block diagram of a wireless device in accordance with an embodiment of the present invention.
  • FIG. 2 is a timing diagram illustrating duty-cycling of a wakeup detection circuit radio within a synchronized communications environment in accordance with the present invention.
  • WSNs Wireless Sensor Networks
  • BAN Body Area Networks
  • the present invention is directed to on-demand waking up of wireless communication devices, and advantageously permits the device receivers to reside in reduced power mode while still being able to monitor for signals.
  • the device receiver while residing in a reduced power mode, is able to decide when to turn itself on to listen for communications, and when communications are present, to prompt a full power-up of the device.
  • This can be implemented by having a wakeup detection circuit monitor for a full device wakeup request, and monitor on a scheduled basis to permit the wakeup detection circuit to reside in a reduced power mode when monitoring is not required.
  • the present invention can provide power reduction by duty -cycling wakeup detection circuitry so that the wakeup detection circuitry is asleep during periods where no communications are expected and wakes up to listen for data communications when data communications are expected (i.e., when the device is allowed to received data in accordance with a Time Division Multiple Access, or TDMA, protocol).
  • TDMA Time Division Multiple Access
  • methods and devices of the present invention can promote cost efficiencies by avoiding the need to use high accuracy clocks.
  • the wakeup detection circuit is only listening during timeslots where communications are expected, the power consumption and sensitivity restrictions on the wakeup detection circuit can be relaxed.
  • a wireless communication device is implemented as part of a wireless network.
  • the communication device has a wireless transceiver and signal processing circuit for communicating to other devices in the wireless network, for example according to a TDMA protocol.
  • the communications device is placed into a reduced power mode.
  • a wakeup signal detection circuit is also placed into a reduced power mode, and is powered up periodically according to a duty cycle. The duty cycle is timed to wake up the wakeup signal detection circuit during the timeslots in which the wireless device is allowed to receive communications. When the wakeup signal detection circuit is powered up, it monitors for the presence of data to be received and processed.
  • the wakeup signal detection circuit When the wakeup signal detection circuit detects a device wakeup request, signaling that a data packet is being transmitted, the wakeup signal detection circuit prompts the wireless communications device to transition from the reduced power mode to the powered-up communications mode so that the data can be properly received and processed.
  • FIG. 1 shows a block diagram of a wireless device for use in a wireless network according to an example embodiment of the present invention.
  • Antenna 102 receives transmissions from a wireless network of devices.
  • Switch 103 can be optionally implemented to selectively connect antenna 102 to either wakeup detection circuit 104 or to signal processing circuit 110.
  • the switch 103 is responsive to the power state of the signal processing circuit 110. In sleep (reduced power) mode, the switch connects antenna 102 to wakeup detection circuit 104. In wakeup (active communications) mode, the switch connects antenna 102 to signal processing circuit 110. In some instances, no switch is necessary as the antenna can be connected to both wakeup detection circuit 104 and signal processing circuit 110 at the same time. In some other instances, the wakeup detection circuit 104 and the signal processing circuit 110 can share some building blocks such as a low noise amplifier (LNA).
  • LNA low noise amplifier
  • Wakeup detection circuit 104 has sleep and wakeup modes that are regulated by duty cycle 106.
  • Duty cycle 106 can alternately provide wakeup calls 117 to power up detection circuitry 104 into a monitoring mode, and sleep calls 118 to place detection circuitry 104 in a reduced power mode.
  • Duty cycle 106 can be synchronized with a TDMA protocol so that the wakeup detection circuit 104 is operated in wakeup mode only when data packets are allowed to be received.
  • wakeup detection circuit 104 is responsive to whether data is being communicated to the device for processing. The presence of communicated data is seen by the wakeup detection circuit as a device wakeup request.
  • the wakeup detection circuit When the device wakeup request is received, the wakeup detection circuit prompts a wakeup call 108, transitioning the signal processing circuit 110 to a powered-up communications mode so that it can receive and process data 112.
  • the power control unit 116 can trigger a sleep call 114 that transitions the signal processing circuit back into reduced power mode.
  • the duty cycle unit 106 can trigger a sleep call 118 that transitions the wakeup detection circuit back into sleep mode
  • the wakeup detection circuit 104 is responsive to device wakeup requests that signal the presence of data to be received and processed.
  • a device wakeup request can be presented in any suitable format, for example as a preamble in the data packet. Presenting the device wakeup request as a preamble in the data packet can afford the wakeup detection circuit 104 sufficient time to trigger a wake up of the signal processing circuit 110 before the data in the data packet is actually received, thereby minimizing potential data loss.
  • the time lines in FIG. 2 can be used to exemplify a wakeup control scheme of a wireless sensor network in accordance with the present invention.
  • time is divided into fixed slots, designated Slot 1, Slot 2, Slot 3, and Slot 4, which form the basis of the TDMA protocol. Accordingly, in each slot only a particular node is allowed to receive data packets, for example time Slot 2 can be allocated to Node 2, time Slot 3 can be allocated to Node 3, and so on, although any desired time division can be used. Any node can transmit a packet in any slot depending on the desired recipient node of the data packet.
  • Node 3 sends a data packet P to Node 2 in time Slot 2. The duration of the transmission of the data packet P is indicated by
  • synchronization beacons B sync In addition to the timeslots for receiving data at respective nodes, there can be specialized timeslots used for time synchronization of the whole network, labeled in FIG. 2 as synchronization beacons B sync . All nodes listen to the synchronization beacons and reset their internal clocks at the reception of the beacon. A particular node, called the master, has the task of periodically sending the synchronization beacon. The duration of the reception timeslots should be long enough to account for timing errors between the clock of the receiver node and the clock of the transmitter node to help ensure that a packet is transmitted when the recipient node is listening to the channel.
  • the node clocks are reset at the reception of the synchronization beacons, timing errors in receivers and transmitters are accumulated from the last synchronization beacon, and will depend on clock accuracy. Most of the energy is spent in idle listening to the channel at the receiving node, as opposed to transmitting the packet from the transmitter node since the packet transmission time is usually much shorter than the listening time. In accordance with the present invention, the idle listening energy is reduced by turning on the receiving node's radio only when a packet is going to be received.
  • the wakeup detection circuit can remain in a reduced power sleep mode until being turned on in accordance with its duty cycle during the timeslot designated for the node to receive communications.
  • the duration of the power-up portion of the duty cycle for the wakeup detection circuit for Node 2 is indicated by T WU2
  • the duration of the power-up portion of the duty cycle for the wakeup detection circuit for Node 3 is indicated by Twu3-
  • data packets can be provided with a preamble that is used as the device wakeup request, but that is otherwise not processed.
  • redundancy can be built into the data packet. Duty-cycling of the wakeup detection circuit in concert with the TDMA protocol reduces the energy spent listening to the channel, and relaxes constraints on power consumption.
  • the power-up portions of the duty cycles for the wakeup detection circuits for each of the nodes can also include the time period over which the synchronization beacon is expected. As such, receiving the synchronization beacon can be handled in the same manner as for any other communication, except that the wakeup detection circuits for all nodes can be activated to monitor for the synchronization beacon communication.
  • the present invention can enable the use of a lower accuracy timing reference implemented with a fully integrated clock generator. Because only the wakeup detection circuit is listening to the communications channel during the node's receiving timeslot, the power consumption in listening mode is reduced. As such, the allowed skew between clocks is relaxed, and fully integrated clocks, which can have accuracies of greater than 5000 ppm, can be used. Moreover, since the power budget for the wakeup detection circuit is increased by duty -cycling, the wakeup detection circuit does not need narrow bandwidth channel filtering, and it can be completely integrated without any components other than the ones available in standard integrated circuit technology, with a consequent beneficial effect on costs.
  • the duration of the receiving slots and, consequently, the listening period of the nodes can be relatively long.
  • the clock accuracy is 1%
  • the synchronization beacon period and the duration of reception slots can be 10 s and 400 ms, respectively.
  • the wakeup detection circuit would have a duty cycle of 4.67% and the fraction of total average power due to a 500 ⁇ W wakeup detection circuit would be only 23.4 ⁇ W.

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

Abstract

L'invention concerne des dispositifs de communications sans fil activables, et des procédés d'activation de dispositifs de communications sans fil aux fins de leur utilisation dans un réseau sans fil desdits dispositifs. Les dispositifs communiquent dans des intervalles de temps respectivement désignés selon un protocole de communications. Les dispositifs sans fil comprennent un émetteur-récepteur sans fil qui communique par le réseau sans fil dans des intervalles de temps désignés pour les dispositifs, et fonctionne en mode consommation d'énergie réduite dans d'autres intervalles de temps. Les dispositifs sans fil comprennent également un circuit activable de détection d'activation (106) qui agit de manière synchrone avec les intervalles de temps TDMA désignés pour les dispositifs pour sortir d'un mode consommation d'énergie réduite, pour détecter des signaux valables dans au moins un des intervalles de temps TDMA désignés pour les dispositifs et, en réponse à cela, pour demander (108) à l'émetteur-récepteur de sortir de son mode consommation d'énergie réduite et de communiquer sur le réseau sans fil.
PCT/IB2008/054042 2007-10-03 2008-10-02 Procédé et système d'activation d'un dispositif de communications sans fil WO2009044368A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US97736907P 2007-10-03 2007-10-03
US60/977,369 2007-10-03

Publications (2)

Publication Number Publication Date
WO2009044368A2 true WO2009044368A2 (fr) 2009-04-09
WO2009044368A3 WO2009044368A3 (fr) 2009-05-22

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102209372A (zh) * 2010-03-31 2011-10-05 电子部品研究院 用于管理节点的低功耗磁场通信方法
GB2486880A (en) * 2010-12-22 2012-07-04 Toumaz Uk Ltd Maximising client node sleep time in wireless TDMA network by adding guard times to time slots at base station
US8935450B2 (en) 2011-09-16 2015-01-13 Nxp B.V. Network communications circuit, system and method
US9240772B2 (en) 2009-04-03 2016-01-19 Nxp, B.V. Frequency synthesiser
US10080122B2 (en) 2013-04-04 2018-09-18 Koninklijke Philips N.V. Receiver, transceiver, transceiver module for a body coupled communication device, a body coupled communication system and a method of waking-up a body coupled receiver of a body coupled communication device
WO2019088754A1 (fr) * 2017-11-02 2019-05-09 엘지전자 주식회사 Procédé de communication dans un système lan sans fil et terminal sans fil utilisant ledit procédé
KR20190137442A (ko) * 2018-06-01 2019-12-11 삼성전자주식회사 Em 센서 및 이를 포함하는 모바일 기기
KR20200029212A (ko) * 2018-09-10 2020-03-18 삼성전자주식회사 Em 센서 모듈을 포함하는 전자 장치 및 이의 제어 방법
CN110996379A (zh) * 2019-11-29 2020-04-10 哈尔滨海能达科技有限公司 唤醒方法、终端节点、发送源节点及存储介质
EP3841675A1 (fr) * 2018-08-24 2021-06-30 Verisure Sàrl Système de surveillance de sécurité et noeud associé

Family Cites Families (3)

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JPS6027241A (ja) * 1983-07-25 1985-02-12 Nec Corp 無線中継方式のバツテリセ−ビング方式
US6289228B1 (en) * 1999-07-20 2001-09-11 Motorola, Inc. Method and apparatus for reducing power consumption of a communication device
US8027373B2 (en) * 2005-09-15 2011-09-27 Qualcomm Incorporated Quick detection of signaling in a wireless communication system

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9240772B2 (en) 2009-04-03 2016-01-19 Nxp, B.V. Frequency synthesiser
CN102209372B (zh) * 2010-03-31 2015-07-01 电子部品研究院 用于管理节点的低功耗磁场通信方法
EP2375632A1 (fr) * 2010-03-31 2011-10-12 Korea Electronics Technology Institute Procédé de communication de champ magnétique pour la gestion de nýuds à faible consommation d'énergie
CN102209372A (zh) * 2010-03-31 2011-10-05 电子部品研究院 用于管理节点的低功耗磁场通信方法
US8488503B2 (en) 2010-03-31 2013-07-16 Korea Electronics Technology Institute Magnetic field communication method for managing node with low power consumption
US9554363B2 (en) 2010-12-22 2017-01-24 Toumaz Uk Limited TDMA-based communication method and system with enhanced clock drift resilience
GB2486880B (en) * 2010-12-22 2015-01-07 Toumaz Uk Ltd A TDMA-based communication method and system
GB2486880A (en) * 2010-12-22 2012-07-04 Toumaz Uk Ltd Maximising client node sleep time in wireless TDMA network by adding guard times to time slots at base station
US8935450B2 (en) 2011-09-16 2015-01-13 Nxp B.V. Network communications circuit, system and method
US10080122B2 (en) 2013-04-04 2018-09-18 Koninklijke Philips N.V. Receiver, transceiver, transceiver module for a body coupled communication device, a body coupled communication system and a method of waking-up a body coupled receiver of a body coupled communication device
WO2019088754A1 (fr) * 2017-11-02 2019-05-09 엘지전자 주식회사 Procédé de communication dans un système lan sans fil et terminal sans fil utilisant ledit procédé
KR20190137442A (ko) * 2018-06-01 2019-12-11 삼성전자주식회사 Em 센서 및 이를 포함하는 모바일 기기
KR102606766B1 (ko) 2018-06-01 2023-11-28 삼성전자주식회사 Em 센서 및 이를 포함하는 모바일 기기
EP3841675A1 (fr) * 2018-08-24 2021-06-30 Verisure Sàrl Système de surveillance de sécurité et noeud associé
KR20200029212A (ko) * 2018-09-10 2020-03-18 삼성전자주식회사 Em 센서 모듈을 포함하는 전자 장치 및 이의 제어 방법
EP3833990A4 (fr) * 2018-09-10 2021-08-25 Samsung Electronics Co., Ltd. Dispositif électronique comprenant un module de capteur électromagnétique et son procédé de commande
US11586245B2 (en) 2018-09-10 2023-02-21 Samsung Electronics Co., Ltd. Electronic device including electromagnetic sensor module and control method thereof
KR102659414B1 (ko) 2018-09-10 2024-04-23 삼성전자 주식회사 Em 센서 모듈을 포함하는 전자 장치 및 이의 제어 방법
CN110996379A (zh) * 2019-11-29 2020-04-10 哈尔滨海能达科技有限公司 唤醒方法、终端节点、发送源节点及存储介质

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