WO2018082793A1 - Dispositif émetteur et dispositif récepteur pour un système de communication - Google Patents

Dispositif émetteur et dispositif récepteur pour un système de communication Download PDF

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Publication number
WO2018082793A1
WO2018082793A1 PCT/EP2016/076845 EP2016076845W WO2018082793A1 WO 2018082793 A1 WO2018082793 A1 WO 2018082793A1 EP 2016076845 W EP2016076845 W EP 2016076845W WO 2018082793 A1 WO2018082793 A1 WO 2018082793A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
receiver device
wake
receiver
transmitter
Prior art date
Application number
PCT/EP2016/076845
Other languages
English (en)
Inventor
Dror Regev
Doron Ezri
Shimon SHILO
Yaron Ben-Arie
Oded Redlich
Genadiy Tsodik
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/EP2016/076845 priority Critical patent/WO2018082793A1/fr
Publication of WO2018082793A1 publication Critical patent/WO2018082793A1/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
    • H04W52/0229—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 to the field of communication systems.
  • the present invention relates to a transmitter device and a receiver device for a
  • Wake-up receivers are becoming a key feature for battery powered internet-of- things (loT) devices, which are needed in order to enable the loT devices to operate for years without charging, and to "wake-up" loT devices to fully operate when instructed by some access-point (AP).
  • AP access-point
  • Using a WUR enables to wake up a station (STA) from a sleep mode to a normal operating mode.
  • STA station
  • the wake-up packets do not carry user data.
  • the reception of the wake-up packet by the WUR triggers a transition of a primary radio (e.g., used to transfer normal packets according to the IEEE 802.1 1 specifications) from the sleep operating mode to the normal operating mode.
  • the WUR used as a companion radio to the primary connectivity radio, has very low active receiver power consumption compared with the active power consumption of the primary radio.
  • a frequency synthesizer In order to reduce the power consumption of the WUR, in many cases a frequency synthesizer is not used (contrary to the primary receiver which can use a frequency synthesizer). This means that there is some frequency uncertainty at the receiver, e.g., if the receiver needs to be tuned to 2.45 GHz, it may be tuned to 2.46 GHz (10 MHz separation). Moreover, this also means that the receiver will generally need to use wider filters in its input in order to cope with this uncertainty in frequency. Furthermore, because of this uncertainty in the frequency, the receiver will "hear" more signals in its input, including signals that are intended for other receivers, on a different frequency band. Therefore, these signals can act as interfering signals or blocking signals.
  • On-Off Keying can be used together with orthogonal frequency-division multiplexing (OFDM), i.e.
  • OFDM orthogonal frequency-division multiplexing
  • Another technique to generate the wake-up signal is based on the so called spread- spectrum techniques, as suggested in the work "An Ultra-Low-Power Receiver Using
  • the invention relates to a transmitter device configured to communicate with a receiver device, wherein the receiver device is operable in a normal communication mode and a sleep mode.
  • the transmitter device comprises; a processor configured to generate a wake-up signal (t) on the basis of a chirp signal s(t) for switching the receiver device from the sleep mode to the normal communication mode; and a communication interface configured to transmit the wake-up signal (t) to the receiver device.
  • a transmitter device which has an optimized power consumption, due to the fact that a chirp signal having a basically zero peak-to-average power ratio (PAPR) is used in order to generate a wake-up signal.
  • PAPR peak-to-average power ratio
  • the use of the chirp signal advantageously gives immunity to narrowband interference, because of the spreading gain associated with the chirp signal.
  • the transmitter device is a WiFi access point, or a communication device, in particular a mobile handset, and the receiver device is a WiFi communication client device, or an loT client device.
  • the processor is configured to process, in particular to multiply, the chirp signal s(t) with an information signal c(t) for generating the wake-up signal w(t).
  • the processor is configured to add a frequency- shifted version of the chirp signal s(t) to the chirp signal s(t) processed with the information signal c(t) for generating the wake-up signal w(t).
  • the chirp signal s(t) is a linear chirp signal s(t).
  • a baseband representation of the chirp signal s(t) is given by the following equation: wherein a and b denote parameters of the chirp signal s(t) .
  • the invention relates to a receiver device configured to communicate with a transmitter device, for instance a transmitter device according to the first aspect, wherein the receiver device is operable in a normal communication mode and a sleep mode.
  • the receiver device comprises a communication interface configured to receive a wake-up signal (t) from the transmitter device, wherein the wake-up signal (t) is based on a chirp signal s(t), and a processor configured to switch the receiver device from the sleep mode to the normal communication mode in response to receiving the wake-up signal (t) from the transmitter device.
  • the receiver device is a WiFi access point, or a communication device, in particular a mobile handset, while the transmitter device is a WiFi communication client device, or an loT client device.
  • the wake-up signal (t) is based on the chirp signal s t) processed, in particular multiplied, with an information signal c(t).
  • the wake-up signal (t) is based on a sum of the chirp signal s t) processed with the information signal c(t) and a frequency-shifted version of the chirp signal s t).
  • This provides the advantage of a faster acquisition of the wake-up signal from the receiver device.
  • the chirp signal s t) is a linear chirp signal s t).
  • a baseband representation of the chirp signal s t) is given by the following equation: wherein a and b denote parameters of the chirp signal s(t) -
  • the processor is configured to switch the receiver device to the normal communication mode only if the wake-up signal comprises an address or identifier of the receiver device.
  • the invention relates to a method of operating a transmitter device configured to communicate with a receiver device, wherein the receiver device is operable in a normal communication mode and a sleep mode.
  • the method comprises the steps of generating a wake-up signal w(t) on the basis of a chirp signal s(t) for switching the receiver device from the sleep mode to the normal communication mode, and transmitting the wake-up signal (t) to the receiver device.
  • the method according to the third aspect of the invention can be performed by the transmitter device according to the first aspect of the invention. Further features of the method according to the third aspect of the invention result directly from the functionality of the transmitter device according to the first aspect of the invention and its different implementation forms.
  • the invention relates to a method of operating a receiver device configured to communicate with a transmitter device, wherein the receiver device is operable in a normal communication mode and a sleep mode.
  • the method comprises the steps of receiving a wake-up signal w(t) from the transmitter device, wherein the wake-up signal (t) is based on a chirp signal s t), and switching the receiver device from the sleep mode to the normal communication mode in response to receiving the wake-up signal w(t) from the transmitter device.
  • the method according to the fourth aspect of the invention can be performed by the receiver device according to the second aspect of the invention. Further features of the method according to the fourth aspect of the invention result directly from the functionality of the receiver device according to the second aspect of the invention and its different implementation forms.
  • the invention relates to a computer program comprising program code for performing the method according to the third aspect or the method according to the fourth aspect of the invention when executed on a computer.
  • the invention can be implemented in hardware and/or software.
  • Fig. 1 shows a schematic diagram of a communication system comprising a transmitter device according to an embodiment configured to communicate with a receiver device according to an embodiment;
  • Fig. 2 shows a diagram illustrating the power spectra of different chirp signals used by a transmitter device and a receiver device according to an embodiment
  • Fig. 3 shows a schematic diagram of a method of operating a transmitter device according to an embodiment
  • Fig. 4 shows a schematic diagram of a method of operating a receiver device according to an embodiment.
  • a disclosure in connection with a described method may also hold true for a corresponding device or system configured to perform the method and vice versa.
  • a corresponding device may include a unit to perform the described method step, even if such unit is not explicitly described or illustrated in the figures.
  • the features of the various exemplary aspects described herein may be combined with each other, unless specifically noted otherwise.
  • Figure 1 shows a schematic diagram of a communication system 100 comprising a transmitter device 102 according to an embodiment configured to communicate over a communication channel 1 10 with a receiver device 104 according to an embodiment.
  • the receiver device 104 is operable in a normal communication mode and a sleep mode.
  • the transmitter device 102 can be a WiFi access point, or a mobile handset.
  • the receiver device 104 can be a WiFi communication client device, or an loT client device.
  • the transmitter device 102 comprises a processor 102a which is configured to generate a wake-up signal (t) on the basis of a chirp signal s(t) for switching the receiver device 104 from the sleep mode to the normal communication mode, and a communication interface 102b configured to transmit the wake-up signal w(t) to the receiver device 104.
  • the communication interface 102b of the transmitter device 102 can comprise a radio antenna.
  • the receiver device 104 comprises a communication interface 104b configured to receive the wake-up signal w(t) from the transmitter device 102, and a processor 104a which is configured to switch the receiver device 104 from the sleep mode to the normal communication mode in response to receiving the wake-up signal w(t) from the transmitter device 102.
  • the communication interface 104b of the receiver device 104 can comprise a radio antenna.
  • Figure 2 shows two power spectra of chirp signals used by the transmitter device 102 and/or the receiver device 104 according to an embodiment.
  • a wake-up signal that is based on a chirp signal can be generated according to one of the following options: (i) as a sum of the reference signal in the form of a chirp signal (e.g., as shown in figure 2) and a modulated signal based on the reference signal, or (ii) as a modulated reference signal (i.e. chirp signal) only, that is without the stand-alone reference signal.
  • a chirp signal as the reference signal provides the advantage that the power consumption of the receiver device can be reduced.
  • the processor 102a of the transmitter device 102 is configured to process, in particular to multiply, the chirp signal, which is herein denoted as s(t), with an information signal, which is herein denoted as c(t), for generating the wake-up signal, which is herein denoted as w(t) .
  • the processor 102a of the transmitter device 102 is configured to add to the chirp signal s(t) processed with the information signal c(t), a frequency shifted version of the chirp signal s(t), for generating the wake-up signal w(t).
  • the chirp signal s(t) is a linear chirp signal s(t) , i.e. a chirp signal with a linear time dependency of the frequency.
  • the baseband representation of the reference signal or chirp signal is given by:
  • a and b can be defined according to the required bandwidth and/or signal variation within a symbol duration, and both are known at the transmitter device 102 and at the receiver device 104.
  • the modulated signal can be obtained by multiplying the reference signal by a value of each bit (e.g. 0 or 1 ), denoted here as c(t).
  • c(t) can carry any kind of information (broadcast, unicast), e.g., c(t) can be used to indicate that from a certain moment on the wake-up signal will be on a different frequency.
  • the two signals can be shifted in frequency so that a gap in frequency of Af between the reference signal and the modulated signal (also known at both transmitter device 102 and receiver device 104) can be produced.
  • FIG 2 an example for the reference signal (or chirp signal) and of the modulated signal as a function of the frequency is shown, wherein each signal has a bandwidth of 1 MHz and the two signals are separated by 1 MHz.
  • Using a signal which contains both the reference signal and the modulated signal has the advantage that the receiver device 104 does not need a filter at the input, or it needs a very wide filter. This is due to the fact that a multiplication of the received signal by itself yields the wanted signal (pre-processing) at ⁇ .This also means that a fast acquisition of the wake-up signal is possible, even when there is interference or a large uncertainty in the frequency.
  • Using a signal which contains only the modulated signal has the advantage that the receiver device 104 can require a single down-conversion, since after the multiplication of the signal by itself, the wanted signal will be centered around zero. Furthermore, the transmitted signal can have a very low PAPR (practically close to zero). This has the advantage that an efficient transmitter device 102 can be provided. Moreover, a good coverage of the transmitted signal as well as a high power efficiency can also be achieved.
  • the use of the chirp signal advantageously gives immunity to narrowband interference, because of the spreading gain associated with the chirp signal. Moreover, the use of the chirp signal yields very low (theoretically zero) PAPR, which advantageously enables very low input power back-off at the transmitter device 102, therefore a better power
  • the advantage of providing flexibility at the receiver device 104 as well as at the transmitter device 102 can be achieved.
  • the option which makes use of the modulated signal only can be used, in case there is a low interference and the power efficiency of the transmitter device 102 plays an important role.
  • the option which makes use of the sum of the modulated signal and of the reference signal can be used, in case a fast acquisition is required and there is a lot of interference.
  • FIG 3 shows a schematic diagram of a method 300 of operating a transmitter device, for instance the transmitter device 102 shown in figure 1 , configured to communicate with a receiver device, for instance the receiver device 104 shown in figure 1 , according to an embodiment, wherein the receiver device 104 is operable in a normal communication mode and a sleep mode.
  • the method 300 comprises the following steps: generating 302 a wake-up signal (t) on the basis of a chirp signal s(t) for switching the receiver device 104 from the sleep mode to the normal communication mode, and transmitting 304 the wake-up signal (t) to the receiver device 104.
  • Figure 4 shows a schematic diagram of a method 400 of operating a receiver device 104, for instance the receiver device 104 shown in figure 1 , configured to communicate with a transmitter device 102, for instance the transmitter device 102 shown in figure 1 , according to an embodiment, wherein the receiver device 104 is operable in a normal communication mode and a sleep mode.
  • the method 400 comprises the following steps: receiving 402 a wake-up signal w(t) from the transmitter device 102, wherein the wake-up signal (t) is based on a chirp signal s(t), and switching 404 the receiver device 104 from the sleep mode to the normal communication mode in response to receiving the wake-up signal w(t) from the transmitter device 102.

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

Abstract

La présente invention concerne un dispositif émetteur (102) et un dispositif récepteur (104) dans un système de communication (100). Le dispositif émetteur (102) est configuré pour communiquer avec le dispositif récepteur (104), le dispositif récepteur (104) pouvant fonctionner dans un mode de communication normal et en mode sommeil. Le dispositif émetteur (102) comprend un processeur (102a) configuré pour générer un signal de réveil w (t) sur la base d'un signal de modulation à fréquence s (t) pour commuter le dispositif récepteur (104) du mode sommeil au mode de communication normal, et une interface de communication (102b) configurée pour transmettre le signal de réveil w (t) au dispositif récepteur (104).
PCT/EP2016/076845 2016-11-07 2016-11-07 Dispositif émetteur et dispositif récepteur pour un système de communication WO2018082793A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/EP2016/076845 WO2018082793A1 (fr) 2016-11-07 2016-11-07 Dispositif émetteur et dispositif récepteur pour un système de communication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/076845 WO2018082793A1 (fr) 2016-11-07 2016-11-07 Dispositif émetteur et dispositif récepteur pour un système de communication

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024036614A1 (fr) * 2022-08-19 2024-02-22 Huawei Technologies Co., Ltd. Procédés, appareil et systèmes de réveil de faible complexité et de faible puissance d'un dispositif électronique

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Title
"A 2.45GHz, 50uW Wake-up Receiver Front-end with -88dBm Sensitivity and 250kbps data rate", IEEE EUROPEAN SOLID STATE CIRCUITS CONFERENCE, 2014
"A -97dBm Sensitivity Interfered Resilient 2.4GHz Wake-Up Receiver using Dual-IF Multi-N Path Architecture in 65nm CMOS", ISSCC, 2015
"An Ultra-Low-Power Receiver Using Transmitted Reference and Shifted Limiters for In-Band Interference Resilience", ISSCC, 2016
"Communication systems engineering", 6 September 2001, PRENTICE HALL, ISBN: 978-0-13-061793-4, article JOHN G. PROAKIS ET AL: "Communication systems engineering", XP055275763 *
IEEE: "Draft Amendment to IEEE Standard for Information technology- Telecommunications and information exchange between systems- PART 15.4:Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for Low-Rate Wireless Personal Area Networks (LR-WPANs): Amendment to add alternate PHY", 1 January 2007 (2007-01-01), XP055386137, Retrieved from the Internet <URL:http://ieeexplore.ieee.org/stampPDF/getPDF.jsp?tp=&arnumber=4152704> [retrieved on 20170628] *
SEN M KUO ET AL: "Real-Time Digital Signal Processing, Fundamentals, Implementations and Applications", 5 August 2013 (2013-08-05), pages 286, XP055385895, ISBN: 978-1-118-41432-3, Retrieved from the Internet <URL:http://eu.wiley.com/WileyCDA/WileyTitle/productCd-1118414322.html> [retrieved on 20170628] *
SUHUA TANG ET AL: "Wake-up receiver for radio-on-demand wireless LANs", EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING, vol. 2012, no. 1, 1 December 2012 (2012-12-01), XP055385868, DOI: 10.1186/1687-1499-2012-42 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024036614A1 (fr) * 2022-08-19 2024-02-22 Huawei Technologies Co., Ltd. Procédés, appareil et systèmes de réveil de faible complexité et de faible puissance d'un dispositif électronique

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