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WO2018190599A1 - Procédé pour effectuer une retransmission dans un système de réseau lan sans fil et terminal sans fil utilisant ce dernier - Google Patents

Procédé pour effectuer une retransmission dans un système de réseau lan sans fil et terminal sans fil utilisant ce dernier Download PDF

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Publication number
WO2018190599A1
WO2018190599A1 PCT/KR2018/004169 KR2018004169W WO2018190599A1 WO 2018190599 A1 WO2018190599 A1 WO 2018190599A1 KR 2018004169 W KR2018004169 W KR 2018004169W WO 2018190599 A1 WO2018190599 A1 WO 2018190599A1
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WO
WIPO (PCT)
Prior art keywords
wur
packet
wireless terminal
terminal
wakeup packet
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PCT/KR2018/004169
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English (en)
Korean (ko)
Inventor
김서욱
류기선
김정기
Original Assignee
엘지전자 주식회사
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Publication of WO2018190599A1 publication Critical patent/WO2018190599A1/fr

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    • 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
    • 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 wanted signal where the received signal is a power saving command
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • 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 disclosure relates to wireless communication, and more particularly, to a method for performing retransmission in a WLAN system and a wireless terminal using the same.
  • next-generation WLANs 1) enhancements to the Institute of Electronics and Electronics Engineers (IEEE) 802.11 physical physical access (PHY) and medium access control (MAC) layers in the 2.4 GHz and 5 GHz bands, and 2) spectral efficiency and area throughput. aims to improve performance in real indoor and outdoor environments, such as in environments where interference sources exist, dense heterogeneous network environments, and high user loads.
  • IEEE Institute of Electronics and Electronics Engineers
  • PHY physical physical access
  • MAC medium access control
  • next-generation WLAN The environment mainly considered in the next-generation WLAN is a dense environment having many access points (APs) and a station (STA), and improvements in spectral efficiency and area throughput are discussed in such a dense environment.
  • next generation WLAN there is an interest in improving practical performance not only in an indoor environment but also in an outdoor environment, which is not much considered in a conventional WLAN.
  • next-generation WLANs we are interested in scenarios such as wireless office, smart-home, stadium, hot spot, building / apartment and based on the scenario. As a result, there is a discussion about improving system performance in a dense environment with many APs and STAs.
  • next-generation WLAN In addition, in the next-generation WLAN, there will be more discussion about improving system performance in outdoor overlapping basic service set (OBSS) environment, improving outdoor environment performance, and cellular offloading, rather than improving single link performance in one basic service set (BSS). It is expected.
  • the directionality of these next-generation WLANs means that next-generation WLANs will increasingly have a technology range similar to that of mobile communications. Considering the recent situation in which mobile communication and WLAN technology are discussed together in the small cell and direct-to-direct (D2D) communication area, the technical and business convergence of next-generation WLAN and mobile communication is expected to become more active.
  • D2D direct-to-direct
  • An object of the present specification is to provide a method for performing retransmission in a WLAN system having an improved performance and a wireless terminal using the same.
  • a method of performing retransmission in a WLAN system performed by an access point (AP) includes a plurality of main radio modules and a plurality of wake-up radio (WUR) modules. Transmit a first wake-up packet for the wireless terminal, wherein the first wake-up packet instructs the plurality of main radio modules to enter an active state, and the first wake-up packet is OOK (On-Off). Modulated according to a Keying) technique; And a second wakeup packet for at least one wireless terminal and the main radio when at least one PS-poll frame is not received in response to a first wakeup packet from at least one wireless terminal among a plurality of wireless terminals. Transmitting a downlink packet for the module on an OFDMA basis, wherein the second wake-up packet is modulated according to the OOK technique.
  • WUR wake-up radio
  • a method for performing retransmission in a WLAN system having improved performance and a wireless terminal using the same are provided.
  • FIG. 1 is a conceptual diagram illustrating a structure of a WLAN system.
  • FIG. 2 is a diagram illustrating an example of a PPDU used in the IEEE standard.
  • FIG. 3 is a diagram illustrating an example of a HE PPDU.
  • FIG. 4 shows an internal block diagram of a wireless terminal receiving a wakeup packet.
  • FIG. 5 is a conceptual diagram illustrating a method for a wireless terminal to receive a wakeup packet and a data packet.
  • FIG. 6 shows an example of a format of a wakeup packet.
  • FIG. 7 shows a signal waveform of a wakeup packet.
  • FIG. 8 is a diagram for describing a procedure of determining power consumption according to a ratio of bit values constituting information in a binary sequence form.
  • FIG. 9 is a diagram illustrating a design process of a pulse according to the OOK technique.
  • FIG. 10 is a diagram illustrating a case where a plurality of wireless terminals perform power management according to a wakeup packet for a plurality of wireless terminals.
  • 11 illustrates various cases of managing power of a wireless terminal based on wakeup packets for a plurality of wireless terminals.
  • FIG. 14 is a diagram illustrating a method of performing retransmission in a WLAN system according to another exemplary embodiment.
  • FIG. 15 is a diagram illustrating a method for retransmission in a WLAN system according to another embodiment.
  • 16 is a conceptual diagram illustrating a method of performing retransmission based on OFDMA in a WLAN system according to an embodiment.
  • 17 is a flowchart illustrating a method of performing retransmission in the WLAN system according to the present embodiment.
  • FIG. 18 is a block diagram illustrating a wireless device to which the present embodiment can be applied.
  • 19 is a block diagram illustrating an example of an apparatus included in a processor.
  • FIG. 1 is a conceptual diagram illustrating a structure of a WLAN system.
  • FIG. 1A shows the structure of an infrastructure network of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.
  • IEEE Institute of Electrical and Electronic Engineers
  • the WLAN system 10 of FIG. 1A may include at least one basic service set (hereinafter, referred to as 'BSS', 100, 105).
  • the BSS is a set of access points (APs) and stations (STAs) that can successfully synchronize and communicate with each other, and is not a concept indicating a specific area.
  • APs access points
  • STAs stations
  • the first BSS 100 may include a first AP 110 and one first STA 100-1.
  • the second BSS 105 may include a second AP 130 and one or more STAs 105-1, 105-2.
  • the infrastructure BSS may include at least one STA, AP (110, 130) providing a distribution service (Distribution Service) and a distribution system (DS, 120) connecting a plurality of APs. have.
  • the distributed system 120 may connect the plurality of BSSs 100 and 105 to implement an extended service set 140 which is an extended service set.
  • the ESS 140 may be used as a term indicating one network to which at least one AP 110 or 130 is connected through the distributed system 120.
  • At least one AP included in one ESS 140 may have the same service set identification (hereinafter, referred to as SSID).
  • the portal 150 may serve as a bridge for connecting the WLAN network (IEEE 802.11) with another network (for example, 802.X).
  • a network between APs 110 and 130 and a network between APs 110 and 130 and STAs 100-1, 105-1, and 105-2 may be implemented. Can be.
  • FIG. 1B is a conceptual diagram illustrating an independent BSS.
  • the WLAN system 15 of FIG. 1B performs communication by setting a network between STAs without the APs 110 and 130, unlike FIG. 1A. It may be possible to.
  • a network that performs communication by establishing a network even between STAs without the APs 110 and 130 is defined as an ad-hoc network or an independent basic service set (BSS).
  • BSS basic service set
  • the IBSS 15 is a BSS operating in an ad-hoc mode. Since IBSS does not contain an AP, there is no centralized management entity. Thus, in the IBSS 15, the STAs 150-1, 150-2, 150-3, 155-4, and 155-5 are managed in a distributed manner.
  • All STAs 150-1, 150-2, 150-3, 155-4, and 155-5 of the IBSS may be mobile STAs, and access to a distributed system is not allowed. All STAs of the IBSS form a self-contained network.
  • the STA referred to herein includes a medium access control (MAC) conforming to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard and a physical layer interface to a wireless medium.
  • MAC medium access control
  • IEEE Institute of Electrical and Electronics Engineers 802.11
  • any functional medium it can broadly be used to mean both an AP and a non-AP Non-AP Station (STA).
  • the STA referred to herein includes a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), and a mobile station (MS). It may also be called various names such as a mobile subscriber unit or simply a user.
  • WTRU wireless transmit / receive unit
  • UE user equipment
  • MS mobile station
  • FIG. 2 is a diagram illustrating an example of a PPDU used in the IEEE standard.
  • PPDUs PHY protocol data units
  • LTF and STF fields included training signals
  • SIG-A and SIG-B included control information for the receiving station
  • data fields included user data corresponding to the PSDU.
  • This embodiment proposes an improved technique for the signal (or control information field) used for the data field of the PPDU.
  • the signal proposed in this embodiment may be applied on a high efficiency PPDU (HE PPDU) according to the IEEE 802.11ax standard. That is, in the present embodiment, the signal to be improved may be HE-SIG-A and / or HE-SIG-B included in the HE PPDU. Each of HE-SIG-A and HE-SIG-B may also be represented as SIG-A or SIG-B.
  • the improved signal proposed by the present embodiment is not necessarily limited to the HE-SIG-A and / or HE-SIG-B standard, and controls / control of various names including control information in a wireless communication system for transmitting user data. Applicable to data fields.
  • FIG. 3 is a diagram illustrating an example of a HE PPDU.
  • the control information field proposed in this embodiment may be HE-SIG-B included in the HE PPDU as shown in FIG. 3.
  • the HE PPDU according to FIG. 3 is an example of a PPDU for multiple users.
  • the HE-SIG-B may be included only for the multi-user, and the HE-SIG-B may be omitted in the PPDU for the single user.
  • a HE-PPDU for a multiple user includes a legacy-short training field (L-STF), a legacy-long training field (L-LTF), a legacy-signal (L-SIG), High efficiency-signal A (HE-SIG-A), high efficiency-signal-B (HE-SIG-B), high efficiency-short training field (HE-STF), high efficiency-long training field (HE-LTF) It may include a data field (or MAC payload) and a PE (Packet Extension) field. Each field may be transmitted during the time period shown (ie, 4 or 8 ms, etc.).
  • the PPDU used in the IEEE standard is mainly described as a PPDU structure transmitted over a channel bandwidth of 20 MHz.
  • the PPDU structure transmitted over a wider bandwidth (eg, 40 MHz, 80 MHz) than the channel bandwidth of 20 MHz may be a structure applying linear scaling to the PPDU structure used in the 20 MHz channel bandwidth.
  • the PPDU structure used in the IEEE standard is generated based on 64 Fast Fourier Tranforms (FTFs), and a CP portion (cyclic prefix portion) may be 1/4.
  • FFTs Fast Fourier Tranforms
  • CP portion cyclic prefix portion
  • the length of the effective symbol interval (or FFT interval) may be 3.2us
  • the CP length is 0.8us
  • the symbol duration may be 4us (3.2us + 0.8us) plus the effective symbol interval and the CP length.
  • FIG. 4 shows an internal block diagram of a wireless terminal receiving a wakeup packet.
  • the WLAN system 400 may include a first wireless terminal 410 and a second wireless terminal 420.
  • the first wireless terminal 410 includes a main radio module 411 associated with the main radio (ie, 802.11) and a low-power wake-up receiver ('LP WUR') (hereinafter, WUR). Module 412.
  • the main radio module 411 may transmit user data or receive user data in an activated state (ie, an ON state).
  • the first radio terminal 410 may control the main radio module 411 to enter an inactive state (ie, an OFF state).
  • the main radio module 411 may include a plurality of circuits supporting Wi-Fi, Bluetooth® radio (hereinafter referred to as BT radio) and Bluetooth® low energy radio (hereinafter referred to as BLE radio).
  • a wireless terminal operating based on a power save mode may operate in an active state or a sleep state.
  • a wireless terminal in an activated state can receive all frames from another wireless terminal.
  • the wireless terminal in the sleep state may periodically wake up and receive a particular type of frame (e.g., beacon frame transmitted periodically) transmitted by another wireless terminal (e.g., AP).
  • a particular type of frame e.g., beacon frame transmitted periodically
  • another wireless terminal e.g., AP
  • the wireless terminal referred to herein can operate the main radio module in an activated state or in an inactive state.
  • a wireless terminal that includes a main radio module 411 in an inactive state may be of any type transmitted by another wireless terminal (e.g., AP) until the main radio module is woken up by the WUR module 412. Also cannot receive frames (eg, 802.11 type PPDUs).
  • the wireless terminal including the main radio module 411 in an inactive state cannot receive beacon frames periodically transmitted by the AP.
  • the wireless terminal including the main radio module (eg, 411) in the inactive state (ie, the OFF state) according to the present embodiment is in a deep sleep state.
  • a wireless terminal that includes a main radio module 411 in an active state may receive all types of frames (eg, 802.11 type PPDUs) transmitted by other wireless terminals (eg, APs). Can be received.
  • all types of frames eg, 802.11 type PPDUs
  • APs wireless terminals
  • the wireless terminal referred to herein can operate the WUR module in a turn-off state or in a turn-on state.
  • the wireless terminal can only receive certain types of frames transmitted by other wireless terminals.
  • a specific type of frame may be understood as a frame modulated according to an On-Off Keying (OOK) modulation scheme described below with reference to FIG. 5.
  • OOK On-Off Keying
  • the wireless terminal may not receive any type of frame transmitted by the other wireless terminal.
  • the terms for the activation state and the turn-on state may be used interchangeably.
  • the terms deactivation state and turn-off state may be used interchangeably to indicate an OFF state of a particular module included in the wireless terminal.
  • the wireless terminal may receive a frame (or packet) from another wireless terminal based on the main radio module 411 in the activated state or the WUR module 412 in the turn-on state.
  • the WUR module 412 may be a receiver for waking the main radio module 411. That is, the WUR module 412 may not include a transmitter.
  • the WUR module 412 may be turned on in a section in which the main radio module 411 is in an inactive state.
  • the first radio terminal 410 may be configured to have a main radio module 411 in an inactive state. It can be controlled to enter the activation state.
  • WUP wake-up packet
  • the low power wake up receiver (LP WUR) included in the WUR module 412 targets a target power consumption of less than 1 mW in an active state.
  • low power wake-up receivers may use a narrow bandwidth of less than 5 MHz.
  • the power consumption by the low power wake-up receiver may be less than 1 Mw.
  • the target transmission range of the low power wake-up receiver may be the same as the target transmission range of the existing 802.11.
  • the second wireless terminal 420 may transmit user data based on the main radio (ie, 802.11).
  • the second wireless terminal 420 can transmit a wakeup packet (WUP) for the WUR module 412.
  • WUP wakeup packet
  • the second wireless terminal 420 may not transmit user data or a wakeup packet (WUP) for the first wireless terminal 410.
  • the main radio module 411 included in the second wireless terminal 420 may be in an inactive state (ie, an OFF state), and the WUR module 412 is in a turn-on state (ie, an ON state). There may be.
  • FIG. 5 is a conceptual diagram illustrating a method for a wireless terminal to receive a wakeup packet and a data packet.
  • the WLAN system 500 may include a first wireless terminal 510 corresponding to the receiving terminal and a second wireless terminal 520 corresponding to the transmitting terminal.
  • Basic operations of the first wireless terminal 510 of FIG. 5 may be understood through the description of the first wireless terminal 410 of FIG. 4.
  • the basic operation of the second wireless terminal 520 of FIG. 5 may be understood through the description of the second wireless terminal 420 of FIG. 4.
  • a wakeup packet 521 is received based on the WUR module 512 in an active state (ie, an ON state)
  • the WUR module 512 wakes up to wake up the main radio module 511.
  • the signal 523 may be transmitted to the main radio module 511.
  • the wakeup signal 523 may be implemented based on primitive information inside the first wireless terminal 510.
  • the main radio module 511 when the main radio module 511 receives the wake-up signal 523, all of the plurality of circuits (not shown) supporting Wi-Fi, BT radio, and BLE radio included in the main radio module 511 may be provided. It can be activated or only part of it.
  • the actual data included in the wakeup packet 521 may be directly transmitted to a memory block (not shown) of the receiving terminal even if the main radio module 511 is in an inactive state.
  • the receiving terminal may activate only the MAC processor of the main radio module 511. That is, the receiving terminal may maintain the PHY module of the main radio module 511 in an inactive state.
  • the wakeup packet 521 of FIG. 5 will be described in more detail with reference to the following drawings.
  • the second wireless terminal 520 can transmit the wakeup packet 521 to the first wireless terminal 510. That is, in order to control the main radio module 511 of the first wireless terminal 510 to enter the activated state (that is, the ON state), the second wireless terminal 520 may transmit the wakeup packet 521. have.
  • FIG. 6 shows an example of a format of a wakeup packet.
  • the wakeup packet 600 may include one or more legacy preambles 610.
  • the legacy preamble 610 may be modulated according to an existing Orthogonal Frequency Division Multiplexing (OFDM) modulation technique.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the wakeup packet 600 may include a payload 620 after the legacy preamble 610.
  • payload 620 may be modulated according to a simple modulation scheme (eg, On-Off Keying (OOK) modulation technique.
  • OOK On-Off Keying
  • Wakeup packet 600 including payload May be transmitted based on a relatively small bandwidth.
  • a second wireless terminal (eg, 520) may be configured to generate and / or transmit wakeup packets 521, 600.
  • the first wireless terminal (eg, 510) can be configured to process the received wakeup packet 521.
  • the wakeup packet 600 may include a legacy preamble 610 or any other preamble (not shown) defined in the existing IEEE 802.11 standard.
  • the wakeup packet 600 may include one packet symbol 615 after the legacy preamble 610.
  • the wakeup packet 600 may include a payload 620.
  • the legacy preamble 610 may be provided for coexistence with the legacy STA.
  • the legacy preamble 610 may be provided for a third party STA (ie, a STA that does not include an LP-WUR). That is, the legacy preamble 610 may not be decoded by the WUR terminal including the WUR module.
  • an L-SIG field for protecting a packet may be used.
  • an 802.11 STA may detect a start portion of a packet (ie, a start portion of a wakeup packet) through an L-STF field in the legacy preamble 610.
  • the L-SIG field in the legacy preamble 610 may allow the 802.11 STA to know the last part of the packet (ie, the last part of the wakeup packet).
  • a modulated symbol 615 may be added after the L-SIG of FIG. 6.
  • One symbol 615 may be modulated according to a BiPhase Shift Keying (BPSK) technique.
  • BPSK BiPhase Shift Keying
  • One symbol 615 may have a length of 4 us.
  • One symbol 615 may have a 20 MHz bandwidth like a legacy part.
  • Payload 620 includes a wake-up preamble field 621, a MAC header field 623, a frame body field 625, and a Frame Check Sequence (FCS) field 627. can do.
  • FCS Frame Check Sequence
  • the wakeup preamble field 621 may include a sequence for identifying the wakeup packet 600.
  • the wakeup preamble field 621 may include a pseudo random noise sequence (PN).
  • PN pseudo random noise sequence
  • the MAC header field 624 may include address information (or an identifier of a receiving apparatus) indicating a receiving terminal receiving the wakeup packet 600.
  • the frame body field 626 may include other information of the wakeup packet 600.
  • the frame body 626 may include length information or size information of the payload.
  • the length information of the payload may be calculated based on length LENGTH information and MCS information included in the legacy preamble 610.
  • the FCS field 628 may include a Cyclic Redundancy Check (CRC) value for error correction.
  • CRC Cyclic Redundancy Check
  • the FCS field 628 may include a CRC-8 value or a CRC-16 value for the MAC header field 623 and the frame body 625.
  • FIG. 7 shows a signal waveform of a wakeup packet.
  • the wakeup packet 700 may include payloads 722 and 724 modulated based on a legacy preamble (802.11 preamble, 710) and an On-Off Keying (OOK) scheme. That is, the wakeup packet WUP according to the present embodiment may be understood as a form in which a legacy preamble and a new LP-WUR signal waveform coexist.
  • a legacy preamble 802.11 preamble, 710
  • OSK On-Off Keying
  • the OOK technique may not be applied.
  • payloads 722 and 724 may be modulated according to the OOK technique.
  • the wakeup preamble 722 included in the payloads 722 and 724 may be modulated according to another modulation technique.
  • the legacy preamble 710 is transmitted based on a channel band of 20 MHz to which 64 FFTs are applied.
  • payloads 722 and 724 may be transmitted based on a channel band of about 4.06 MHz.
  • FIG. 8 is a diagram for describing a procedure of determining power consumption according to a ratio of bit values constituting information in a binary sequence form.
  • information in the form of a binary sequence having '1' or '0' as a bit value may be represented.
  • Communication based on the OOK modulation scheme may be performed based on the bit values of the binary sequence information.
  • the light emitting diode when used for visible light communication, when the bit value constituting the binary sequence information is '1', the light emitting diode is turned on, and when the bit value is '0', the light emitting diode is turned off. (off) can be turned off.
  • the receiver receives and restores data transmitted in the form of visible light, thereby enabling communication using visible light.
  • the blinking of the light emitting diode cannot be perceived by the human eye, the person feels that the illumination is continuously maintained.
  • information in the form of a binary sequence having 10 bit values may be provided.
  • information in the form of a binary sequence having a value of '1001101011' may be provided.
  • bit value when the bit value is '1', when the transmitting terminal is turned on and when the bit value is '0', when the transmitting terminal is turned off, 6 bit values of the above 10 bit values are applied. The corresponding symbol is turned on.
  • the transmission power of the transmitting terminal may not be greatly considered.
  • the reason why the OOK technique is used in the present embodiment is because power consumption in the decoding procedure of the received signal is very small.
  • the existing Wi-Fi power consumption is about 100mW.
  • power consumption of Resonator + Oscillator + PLL (1500uW)-> LPF (300uW)-> ADC (63uW)-> decoding processing (OFDM receiver) (100mW) may occur.
  • -WUR power consumption is about 1mW.
  • power consumption of Resonator + Oscillator (600uW)-> LPF (300uW)-> ADC (20uW)-> decoding processing (Envelope detector) (1uW) may occur.
  • FIG. 9 is a diagram illustrating a design process of a pulse according to the OOK technique.
  • the wireless terminal according to the present embodiment may use an existing 802.11 OFDM transmitter to generate a pulse according to the OOK technique.
  • the existing 802.11 OFDM transmitter can generate a sequence having 64 bits by applying a 64-point IFFT.
  • the wireless terminal according to the present embodiment may transmit a payload of a wakeup packet (WUP) modulated according to the OOK technique.
  • the payload eg, 620 of FIG. 6
  • the payload may be implemented based on an ON time signal and an OFF time signal.
  • the OOK technique may be applied to the ON time signal included in the payload (eg, 620 of FIG. 6) of the wakeup packet WUP.
  • the on time signal may be a signal having an actual power value.
  • the on-time signal included in the payload may be selected from among N1 subcarriers (N1 is a natural number) corresponding to the channel band of the wakeup packet (WUP). It can be obtained by performing IFFT on N2 subcarriers (N2 is a natural number). In addition, a predetermined sequence may be applied to the N2 subcarriers.
  • the channel band of the wakeup packet WUP may be 20 MHz.
  • the N1 subcarriers may be 64 subcarriers, and the N2 subcarriers may be 13 consecutive subcarriers (921 of FIG. 9).
  • the subcarrier interval applied to the wakeup packet (WUP) may be 312.5 kHz.
  • the OOK technique may be applied to the OFF time signal included in the payload (eg, 620 of FIG. 6) of the wakeup packet WUP.
  • the off time signal may be a signal that does not have an actual power value. That is, the off time signal may not be considered in the configuration of the wakeup packet WUP.
  • the on time signal included in the payload (620 of FIG. 6) of the wakeup packet (WUP) is a 1-bit ON signal (ie, a 1-bit ON signal) by the WUR module (eg, 512 of FIG. 5). '1'), i.e., demodulation.
  • the off time signal included in the payload may be determined (ie, demodulated) as a 1-bit off signal (ie, '0') by the WUR module (eg, 512 of FIG. 5).
  • a specific sequence may be preset for the subcarrier set 921 of FIG. 9.
  • the preset sequence may be a 13-bit sequence.
  • a coefficient corresponding to the DC subcarrier in the 13-bit sequence may be '0', and the remaining coefficients may be set to '1' or '-1'.
  • the subcarrier set 921 may correspond to a subcarrier having a subcarrier index of '-6' to '+6'.
  • a coefficient corresponding to a subcarrier whose subcarrier indices are '-6' to '-1' in the 13-bit sequence may be set to '1' or '-1'.
  • a coefficient corresponding to a subcarrier whose subcarrier indices are '1' to '6' in the 13-bit sequence may be set to '1' or '-1'.
  • a subcarrier whose subcarrier index is '0' in a 13-bit sequence may be nulled.
  • the coefficients of the remaining subcarriers (subcarrier indexes '-32' to '-7' and subcarrier indexes '+7' to '+31') except for the subcarrier set 921 are all set to '0'. Can be.
  • the subcarrier set 921 corresponding to 13 consecutive subcarriers may be set to have a channel bandwidth of about 4.06 MHz. That is, power by signals may be concentrated at 4.06 MHz in the 20 MHz band for the wakeup packet (WUP).
  • WUP wakeup packet
  • the power is concentrated in a specific band, so that the signal to noise ratio (SNR) can be increased, and the power consumption for conversion in the AC / DC converter of the receiver can be reduced. . Since the sampling frequency band is reduced to 4.06 MHz, power consumption by the wireless terminal can be reduced.
  • An OFDM transmitter of 802.11 may use IFFT (for 13 consecutive subcarriers) of N2 sub-carriers (e.g., 64 subcarriers) corresponding to the channel band (e.g., 20 MHz band) of a wake-up packet. For example, 64-point IFFT may be performed.
  • a predetermined sequence may be applied to the N2 subcarriers. Accordingly, one on-signal may be generated in the time domain. One bit information corresponding to one on signal may be transmitted through one symbol.
  • a symbol having a 3.2us length corresponding to the subcarrier set 921 may be generated.
  • CP Cyclic Prefix, 0.8us
  • one symbol having a total length of 4us as shown in the time domain graph 910 of FIG. Can be generated.
  • the OFDM transmitter of 802.11 may not transmit the off signal at all.
  • a first wireless terminal (eg, 510 of FIG. 5) including a WUR module (eg, 512 of FIG. 5) may receive a packet based on an envelope detector that extracts an envelope of the received signal. Can be demodulated.
  • the WUR module (eg, 512 of FIG. 5) according to the present embodiment may compare a power level of a received signal obtained through an envelope of the received signal with a preset threshold level.
  • the WUR module (eg, 512 of FIG. 5) may determine the received signal as a 1-bit ON signal (ie, '1'). If the power level of the received signal is lower than the threshold level, the WUR module (eg, 512 of FIG. 5) may determine the received signal as a 1-bit OFF signal (ie, '0').
  • the basic data rate for one information may be 125 Kbps (8us) or 62.5Kbps (16us).
  • each signal having a length of K (eg, K is a natural number) in the 20 MHz band may be transmitted based on consecutive K subcarriers of 64 subcarriers for the 20 MHz band.
  • K may correspond to the number of subcarriers used to transmit the signal.
  • K may also correspond to the bandwidth of a pulse according to the OOK technique.
  • All of the coefficients of the remaining subcarriers except K subcarriers among the 64 subcarriers may be set to '0'.
  • the same K subcarriers may be used.
  • the index for the K subcarriers used may be expressed as 33-floor (K / 2): 33 + ceil (K / 2) -1.
  • the information 1 and the information 0 may have the following values.
  • the alpha is a power normalization factor and may be, for example, 1 / sqrt (K).
  • the main radio module (eg, 511 of FIG. 5, 1311 of FIG. 5) of the wireless terminal (eg, 510 of FIG. 5) is in an inactive state (ie, OFF state),
  • the WUR module (eg, 512 of FIG. 5) is in the turn-on state (ie, in the ON state), it may be said that the wireless terminal operates in the WUR mode or the low power mode.
  • FIG. 10 is a diagram illustrating a case where a plurality of wireless terminals perform power management according to a wakeup packet for a plurality of wireless terminals.
  • the horizontal axis of the AP 1000 may represent a time ta, and the vertical axis may be associated with the existence of a frame to be transmitted by the AP 1000.
  • the first WUR terminal 1010 may include first main radio modules WUR m1 and 1011 and first WUR modules WUR w1 and 1012.
  • the first main radio module 1011 may correspond to the main radio module 511 of FIG. 5.
  • the first WUR module 1012 may correspond to the WUR module 512 of FIG. 5.
  • the horizontal axis of the first main radio module 1011 may represent time tm1.
  • an arrow displayed at the lower end of the horizontal axis of the first main radio module 1011 may indicate a power state (eg, an ON state or an OFF state) of the first main radio module 1011.
  • the vertical axis of the first main radio module 1011 may be associated with the presence of a frame to be transmitted by the first main radio module 1011.
  • the horizontal axis of the first WUR module 1012 may represent the time tw1.
  • an arrow displayed at the lower end of the horizontal axis of the first WUR module 1012 may indicate a power state (eg, an ON state or an OFF state) of the first WUR module 1012.
  • the vertical axis of the first WUR module 1012 may be associated with the presence of a frame to be transmitted by the first WUR module 1012.
  • the second WUR terminal 1020 may include a second main radio module (WUR m2, 1021) and a second WUR module (WUR w2, 1022).
  • the second main radio module 1021 may correspond to the main radio module 511 of FIG. 5.
  • the second WUR module 1022 may correspond to the WUR module 512 of FIG. 5.
  • the horizontal axis of the second main radio module 1021 may represent time tm2.
  • an arrow displayed at a lower end of the horizontal axis of the second main radio module 1021 may indicate a power state (eg, an ON state or an OFF state) of the second main radio module 1022.
  • the longitudinal axis of the second main radio module 1022 may be associated with the presence of a frame to be transmitted by the second main radio module 1022.
  • the horizontal axis of the second WUR module 1022 may represent a time tw2.
  • an arrow displayed at a lower end of the horizontal axis of the second WUR module 1022 may indicate a power state (eg, an ON state or an OFF state) of the second WUR module 1022.
  • the vertical axis of the second WUR module 1022 may be associated with the presence of a frame to be transmitted by the second WUR module 1022.
  • the third WUR terminal 1030 may include a third main radio module (WUR m3, 1031) and a third WUR module (WUR w3, 1032).
  • the third main radio module 1031 may correspond to the main radio module 511 of FIG. 5.
  • the third WUR module 1032 may correspond to the WUR module 512 of FIG. 5.
  • the horizontal axis of the third main radio module 1031 may represent time tm3.
  • an arrow displayed at a lower end of the horizontal axis of the third main radio module 1031 may indicate a power state (eg, an ON state or an OFF state) of the third main radio module 1031.
  • the vertical axis of the third main radio module 1031 may be associated with the presence of a frame to be transmitted by the third main radio module 1031.
  • the horizontal axis of the third WUR module 1032 may represent the time tw3.
  • an arrow displayed at the lower end of the horizontal axis of the third WUR module 1032 may indicate a power state (eg, an ON state or an OFF state) of the third WUR module 1032.
  • the vertical axis of the third WUR module 1032 may be associated with the presence of a frame to be transmitted by the third WUR module 1032.
  • the plurality of WUR terminals is shown as corresponding to the first WUR terminal 1010 to the third WUR terminal 1030.
  • the present specification is not limited thereto.
  • the first WUR terminal 1010 to the third WUR terminal 1030 may be understood as a wireless terminal combined with the AP through a predetermined combining procedure.
  • the first main radio module 1011 of the first WUR terminal 1010 is in an inactive state (ie, an OFF state), and the first WUR module 1012 is turned on. It can be assumed to be in the on state (ie, in the ON state).
  • the second main radio module 1021 of the second WUR terminal 1020 is in an inactive state (i.e., an OFF state), and the second WUR module 1022 is in a turn-on state (i.e., an ON state).
  • the third main radio module 1031 of the third WUR terminal 1030 is in an inactive state (i.e., an OFF state), and the third WUR module 1032 is in a turn-on state (i.e., an ON state).
  • the AP 1000 may transmit a wake-up packet (hereinafter, “WUP”).
  • WUP wake-up packet
  • the wakeup packet (WUP) of FIG. 10 is a plurality of main radio modules (eg, 1021. 1023 may instruct to enter the activated state.
  • the wakeup packet WUP may instruct all main radio modules corresponding to all WUR terminals receiving the wakeup packet WUP to enter an activated state according to a broadcast scheme.
  • the wakeup packet WUP of FIG. 10 may include a first payload modulated according to an on-off keying (OOK) technique for the first WUR module 1012.
  • OLK on-off keying
  • the first payload is an ON signal determined as a 1-bit ON signal by the first WUR module 1012 and 1 bit OFF by the first WUR module 1012.
  • the signal may be generated based on an off signal determined as a signal.
  • the first payload may be transmitted based on a first subchannel belonging to a channel band (eg, 20 MHz) corresponding to N (eg, 64) subcarriers.
  • the first subchannel may be implemented based on N1 (eg, 13) subcarriers among N (eg, 64) subcarriers.
  • the ON signal included in the first payload may be configured for N1 (eg, 13) subcarriers among N (eg, 64) subcarriers corresponding to the channel band of the wakeup packet (WUP).
  • N1 eg, 13
  • N eg, 64
  • IFFT Inverse Fast Fourier Transform
  • the wakeup packet WUP may include a second payload modulated according to the OOK technique for the second WUR module 1022.
  • the second payload is an ON signal determined as a 1 bit ON signal by the second WUR module 1022 and a 1 bit OFF by the second WUR module 1022.
  • the signal may be generated based on an off signal determined as a signal.
  • the second payload may be transmitted based on a second subchannel belonging to a channel band (eg, 20 MHz) corresponding to N (eg, 64) subcarriers.
  • the second subchannel may be implemented based on N2 (eg, 13) subcarriers among the N (eg, 64) subcarriers. In this case, N2 (eg, 13) subcarriers may not overlap with N1 (eg, 13) subcarriers.
  • the wakeup packet WUP may include a third payload modulated according to the OOK scheme for the third WUR module 1032.
  • the third payload is an ON signal determined as a 1-bit ON signal by the third WUR module 1032 and one bit OFF by the third WUR module 1032.
  • the signal may be generated based on an off signal determined as a signal.
  • the third payload may be transmitted based on a third subchannel belonging to a channel band (eg, 20 MHz) corresponding to N (eg, 64) subcarriers.
  • the third subchannel may be implemented based on N3 (eg, 13) subcarriers among the N (eg, 64) subcarriers. In this case, N3 (eg, 13) subcarriers may not overlap with N2 (eg, 13) subcarriers.
  • the main radio module 1011, 1021, 1031 is activated according to a wakeup signal (for example, 523 of FIG. 5), which is a primitive signal generated inside the WUR terminal based on the received wakeup packet (WUP).
  • a wakeup signal for example, 523 of FIG. 5
  • WUP received wakeup packet
  • TOD turn-on delay
  • a protection time may be introduced to reduce unnecessary overhead and delay caused by a mismatch of a power state between an AP and a WUR terminal due to a turn-on delay (TOD).
  • TOD turn-on delay
  • the guard time according to the wakeup packet WUP may be understood as the first period T1 to T2 of FIG. 10.
  • the first sections T1 to T2 of FIG. 10 may be set according to a predetermined parameter for the guard time.
  • the predetermined parameter for the guard time may be a value individually set in the combining procedure between the AP 1000 and each WUR STA (eg, 1010, 1020, 1030).
  • the guard time set in the first to third WUR STAs 1010, 1020, and 1030 of FIG. 10 may be set to have the same time interval (eg, T1 to T2 of FIG. 10).
  • the AP 1000 may wait without transmitting any packets until the first period T1 to T2 of FIG. 10 corresponding to the guard time elapses.
  • each WUR terminal 1010, 1020, 1030 switches from the WUR mode to the normal mode before the first period (eg, T1 to T2) corresponding to the guard time. have.
  • the AP 1000 may transmit a trigger frame to confirm whether the wakeup packet WUP is successfully received to each WUR terminal.
  • the trigger frame may be a frame transmitted based on contention for the wireless channel.
  • the trigger frame referred to herein may be understood as a frame that triggers a plurality of uplink transmissions from a plurality of terminals.
  • the trigger frame may include identification information about a plurality of terminals and frequency resource information allocated to each terminal.
  • identification information about a plurality of terminals and frequency resource information allocated to each terminal.
  • the plurality of WUR terminals 1010, 1020, and 1030 may transmit a plurality of power save poll (PS-pol) frames on overlapping time resources in response to a trigger frame. Can be.
  • PS-pol power save poll
  • the plurality of PS-poll frames may be individually transmitted based on the main radio modules 1011, 1021, and 1031 included in each WUR terminal 1010, 1020, and 1030.
  • the plurality of PS-pole frames may be frames transmitted when a predetermined time d elapses.
  • the predetermined time d may be SIFS.
  • the first WUR terminal 1010 may transmit the first main radio based on the received wake-up packet WUP.
  • the AP 1011 may inform the AP 1000 that the module 1011 has entered an activated state (ie, an ON state).
  • the first PS Poll # 1 frame may be transmitted through a first resource unit allocated to the first WUR terminal 1010.
  • the AP 1000 may determine that the wakeup packet WUP has been successfully received by the first WUR terminal 1010.
  • the second WUR terminal 1020 receives the second main radio module according to the received wake-up packet WUP.
  • the AP 1000 may be notified that 1021 has entered an activated state (ie, an ON state).
  • a second PS Poll # 2 frame may be transmitted through a second resource unit allocated to the second WUR terminal 1020.
  • the AP 1000 may determine that the wakeup packet WUP has been successfully received by the second WUR terminal 1020.
  • the third WUR terminal 1030 may transmit a third main radio module according to the received wake-up packet WUP.
  • the AP 1000 may be informed that the 1031 has entered an activated state (ie, an ON state).
  • the third PS-Poll (PS Poll # 3) frame may be transmitted through a third resource unit allocated to the third WUR terminal 1030.
  • the AP 1000 may determine that the wakeup packet WUP has been successfully received by the third WUR terminal 1030.
  • the AP 1000 may determine a predetermined time after receiving the first to third PS-Poll (PS Poll # 3) frames.
  • a predetermined time d may be SIFS.
  • the ACK frame of FIG. 10 may be received by each of the WUR terminals 1010, 1020, and 1030 based on the first to third main radio modules 1011, 1021, and 1031 in an activated state (that is, an ON state). .
  • 11 illustrates various cases of managing power of a wireless terminal based on wakeup packets for a plurality of wireless terminals.
  • the first main radio module 1111 of the first WUR terminal 1110 is in an inactive state (ie, an OFF state), and the first WUR module 1112 is turned on. It can be assumed to be in the on state (ie, in the ON state).
  • the second main radio module 1121 of the second WUR terminal 1120 is in an inactive state (i.e., an OFF state), and the second WUR module 1122 is in a turn-on state (i.e., an ON state).
  • the third main radio module 1131 of the third WUR terminal 1130 is in an inactive state (ie, an OFF state), and the third WUR module 1132 is in a turn-on state (ie, an ON state).
  • the first WUR terminal 1110 may maintain the WUR mode in the first section T1 to T2 and the second section T2 to T3. In this case, the first WUR terminal 1110 may not receive a trigger frame transmitted by the AP 1100.
  • WUP wakeup packet
  • the second WUR terminal 1120 receives a wake up packet (WUP). According to the above assumption, before the first intervals T1 to T2 corresponding to the guard time pass, the second WUR terminal 1120 of FIG. 11 may switch from the WUR mode to the normal mode.
  • WUP wake up packet
  • the second WUR terminal 1120 may maintain the normal mode in the second period T2 to T3 without additional packet transmission.
  • the third WUR terminal 1130 receives the wakeup packet (WUP). According to the above assumption, before the elapse of the first periods T1 to T2 corresponding to the guard time, the third WUR terminal 1130 of FIG. 11 may switch from the WUR mode to the normal mode.
  • WUP wakeup packet
  • the third WUR terminal 1130 may transmit the third PS poll frame PS Poll # 3 in response to the trigger frame.
  • the third WUR terminal 1130 of FIG. 11 receives an ACK frame for the third PS poll frame (PS Poll # 3) from the AP while maintaining the normal mode in the second intervals T2 to T3. Can not.
  • the AP 1100 determines exactly why the PS-poll frame is not received. It can be difficult to judge.
  • the APs 1200 and 1300 illustrated in FIGS. 12 and 13 correspond to the AP 1100 mentioned in FIG. 11.
  • the WUR terminals 1210 and 1310 illustrated in FIGS. 12 and 13 may be understood to correspond to the first WUR terminal 1110 among the plurality of WUR terminals mentioned in FIG. 11.
  • the AP 1200 may transmit a first wakeup packet WUP # 1.
  • the first wakeup packet WUP # 1 of FIG. 12 is activated by a plurality of main radio modules included in a plurality of WUR terminals including the WUR terminal 1210 of FIG. 12 according to a multicast scheme.
  • a state ie, an ON state
  • the first wakeup packet WUP # 1 of FIG. 12 is activated by all main radio modules corresponding to all WUR terminals that have received the first wakeup packet WUP # 1 according to a broadcast scheme.
  • a state ie, an ON state
  • the first wakeup packet WUP # 1 of FIG. 12 may include a plurality of payloads modulated according to an on-off keying (OOK) technique for the plurality of WUR modules.
  • OOK on-off keying
  • the main radio module 1211 of the WUR terminal 1210 is in an inactive state (ie, an OFF state), and the WUR module 1212 is in a turn-on state (ie, ON state).
  • the WUR terminal 1210 may maintain the WUR mode for the first period T1 to T2 corresponding to the guard time of the first wakeup packet WUP # 1.
  • At least one PS-pol frame may not be received from at least one WUR terminal among the plurality of WUR terminals indicated by the first wakeup packet WUP # 1. have.
  • a PS-poll frame is not received from the WUR terminal 1210 of FIG. 12 among a plurality of WURs indicated by the first wakeup packet WUP # 1.
  • the AP 1200 determines whether the first wakeup packet WUP # 1 is successfully received for the plurality of WUR terminals transmitted in the wakeup period TW to T1.
  • a trigger frame can be sent to confirm.
  • the trigger frame may trigger a plurality of PS-poll frames from a plurality of WUR terminals that have successfully received the first wakeup packet WUP # 1.
  • the trigger frame and the PS-poll frame may be transmitted and received based on the main radio module of the WUR terminal.
  • the WUR terminal 1210 may maintain a WUR mode. That is, the WUR terminal 1210 may not receive a trigger frame transmitted by the AP 1200.
  • the AP 1200 determines whether at least one PS-pole frame is not received from at least one WUR terminal due to some cause.
  • the AP may determine that at least one PS-pol frame is not received from at least one WUR terminal among the plurality of WUR terminals. In this case, the AP may retransmit the first wakeup packet WUP # 1.
  • the AP 1200 may determine that a PS-poll frame is not received from the WUR terminal 1210 of FIG. 12 among a plurality of WUR terminals. In this case, the AP 1200 may perform retransmission of the first wakeup packet WUP # 1.
  • the AP may select a second wakeup packet WUP # 2 for at least one WUR terminal and at least one main radio module included in the at least one WUR terminal.
  • the downlink packet may be transmitted together based on an orthogonal frequency division multiplexing access (OFDMA).
  • OFDMA orthogonal frequency division multiplexing access
  • the AP 1200 may include a second wakeup packet WUP # 2 for the WUR module 1212 included in the WUR terminal 1210 and a main radio module 1211 included in the WUR terminal 1210.
  • Null data packet (NDP) for the same may be transmitted on the basis of OFDMA.
  • the null data packet NDP may mean a packet that does not include a data field in the packet.
  • a trigger frame for triggering at least one uplink transmission from at least one wireless terminal may be transmitted in place of a null data packet NDP.
  • the second wakeup packet WUP # 2 and the null data packet NDP may be transmitted in overlapping time resources.
  • the WUR terminal 1210 may operate in a WUR mode. Accordingly, the WUR terminal 1210 may receive the second wakeup packet WUP # 2.
  • the third section T3 to T4 of FIG. 12 may be understood as a time section corresponding to the guard time of the second wakeup packet WUP # 2.
  • the WUR terminal 1210 of FIG. 12 may switch from the WUR mode to the normal mode according to the received wakeup packet WUP # 2.
  • the WUR terminal 1210 may transmit a PS-poll frame to the AP 1200 in response to the received second wakeup packet WUP # 2.
  • the PS-poll frame may be transmitted based on the main radio module 1211 in an active state (ie, in an ON state).
  • the AP 1200 may know that the WUR terminal 1210 operates in the normal mode. Subsequently, the AP 1200 may transmit an ACK frame in response to the PS-poll frame. In this case, it will be appreciated that the ACK frame may be received based on the main radio module 1211 of the WUR terminal 1210.
  • the AP may transmit first wakeup packets WUP # 1 for a plurality of WUR terminals.
  • the first wakeup packet WUP # 1 of FIG. 13 includes a plurality of mains included in a plurality of WUR terminals (not shown) including the WUR terminal 1310 of FIG. 13 according to a multicast scheme.
  • the radio module may be instructed to enter an activated state (ie, an ON state).
  • the first wakeup packet WUP # 1 of FIG. 13 is activated by all main radio modules corresponding to all WUR terminals receiving the first wakeup packet WUP # 1 according to a broadcast scheme.
  • a state ie, an ON state
  • the first wakeup packet WUP # 1 of FIG. 13 may include a plurality of payloads modulated according to an on-off keying (OOK) technique for a plurality of WUR modules.
  • OOK on-off keying
  • the main radio module 1311 of the WUR terminal 1310 is in an inactive state (ie, an OFF state), and the WUR module 1312 is in a turn-on state (ie, ON state).
  • the WUR terminal 1310 of FIG. 13 may maintain the WUR mode for the first period T1 to T2 corresponding to the guard time of the first wakeup packet WUP # 1.
  • At least one PS-pol frame may not be received from at least one WUR terminal among the plurality of WUR terminals indicated by the first wakeup packet WUP # 1. have.
  • the PS-poll frame may not be received from the WUR terminal 1310 of FIG. 13 among the plurality of WURs indicated by the first wakeup packet WUP # 1.
  • the AP 1300 may perform retransmission for the first wakeup packet WUP # 1 without transmitting a separate trigger frame.
  • the AP 1300 may transmit a plurality of WURs indicated by the first wakeup packet WUP # 1.
  • a second wakeup packet (WUP # 2) for at least one WUR terminal and a downlink packet for at least one main radio module included in the at least one WUR terminal may be transmitted together based on OFDMA.
  • the second wakeup packet WUP # 2 and the WUR terminal 1310 for the WUR module 1312 included in the WUR terminal 1310 are included in the WUR terminal 1310.
  • a null data packet (NDP) for the main radio module 1311 may be transmitted based on OFDMA.
  • the WUR terminal 1310 may operate in the WUR mode. Accordingly, the WUR terminal 1310 may receive the second wakeup packet WUP # 2.
  • the WUR terminal 1210 of FIG. 12 may switch from the WUR mode to the normal mode.
  • a trigger frame for triggering at least one uplink transmission from at least one wireless terminal may be transmitted in place of a null data packet NDP.
  • At least one WUR terminal may transmit at least one PS-poll frame to the AP 1300 in response to the second wakeup packet WUP # 2. .
  • the WUR terminal 1310 may transmit a PS-poll frame to the AP 1300 in response to the received second wakeup packet WUP # 2.
  • the PS-poll frame may be transmitted on a contention basis for the wireless channel.
  • the PS-poll frame may be transmitted based on the main radio module 1311 that is in an active state (ie, in an ON state).
  • the AP 1300 may know that at least one WUR terminal operates in a normal mode. Subsequently, the AP 1300 may transmit at least one ACK frame in response to the at least one PS-poll frame.
  • the AP 1300 may transmit an ACK frame in response to the PS-poll frame received from the WUR terminal 1310 in response to the AP 1300.
  • the ACK frame may be received based on the main radio module 1311 of the WUR terminal 1310.
  • FIG. 14 is a diagram illustrating a method of performing retransmission in a WLAN system according to another exemplary embodiment.
  • the AP 1400 illustrated in FIG. 14 corresponds to the AP 1100 mentioned in FIG. 11.
  • the WUR terminal 1410 illustrated in FIG. 14 corresponds to the second WUR terminal 1120 among the plurality of WUR terminals mentioned in FIG. 11.
  • the AP 1400 may transmit a first wakeup packet WUP # 1.
  • the first wakeup packet WUP # 1 of FIG. 14 is activated by a plurality of main radio modules included in a plurality of WUR terminals including the WUR terminal 1410 of FIG. 14 according to a multicast scheme.
  • a state ie, an ON state
  • the first wakeup packet WUP # 1 of FIG. 14 is activated by all main radio modules corresponding to all WUR terminals that have received the first wakeup packet WUP # 1 according to a broadcast scheme.
  • a state ie, an ON state
  • the first wakeup packet WUP # 1 of FIG. 14 may include a plurality of payloads modulated according to an on-off keying (OOK) technique for the plurality of WUR modules.
  • OOK on-off keying
  • the main radio module 1411 of the WUR terminal 1410 is in an inactive state (ie, an OFF state), and the WUR module 1412 is in a turn-on state (ie, ON state). It may be assumed that the WUR terminal 1410 receives the first wakeup packet WUP # 1.
  • the first periods T1 to T2 of FIG. 14 may be understood as time periods corresponding to the guard time of the first wakeup packet WUP # 1. Before the first period T1 to T2 of FIG. 14 passes, the WUR terminal 1410 of FIG. 14 may switch from the WUR mode to the normal mode according to the received first wakeup packet WUP # 1.
  • the AP 1400 determines whether the first wakeup packet WUP # 1 is successfully received for the plurality of WUR terminals transmitted in the wakeup period TW to T1.
  • a trigger frame can be sent to confirm.
  • the trigger frame of FIG. 14 may trigger a plurality of PS-poll frames from a plurality of WUR terminals that have successfully received the first wakeup packet WUP # 1.
  • the trigger frame may be transmitted and received based on the main radio module of the WUR terminal.
  • the WUR terminal 1210 may maintain a normal mode. However, it may be assumed that the WUR terminal 1410 of FIG. 14 does not receive a trigger frame due to an external factor (for example, a channel condition).
  • an external factor for example, a channel condition
  • the AP 1400 may include at least one PS-pol frame from at least one WUR terminal among the plurality of WUR terminals indicated by the first wakeup packet WUP # 1. Can be determined not to be received. In this case, the AP 1400 may perform retransmission of the first wakeup packet WUP # 1.
  • the AP may select a second wakeup packet WUP # 2 for at least one WUR terminal and at least one main radio module included in the at least one WUR terminal.
  • the downlink packet may be transmitted together based on the OFDMA.
  • the AP 1400 may use the second wakeup packet WUP # 2 for the WUR module 1412 included in the WUR terminal 1410 and the main radio module 1411 included in the WUR terminal 1410.
  • Null data packet (NDP) for the same may be transmitted on the basis of OFDMA.
  • the second wakeup packet WUP # 2 and the at least one null data packet NDP may be transmitted in overlapping time resources.
  • the WUR terminal 1410 may operate in a normal mode. Accordingly, the WUR terminal 1410 may receive a null data packet NDP.
  • the WUR terminal 1410 may transmit an ACK frame in response to a null data packet.
  • the ACK frame may be transmitted based on the main radio module 1411.
  • a trigger frame for triggering at least one uplink transmission from at least one wireless terminal may be transmitted in place of a null data packet NDP.
  • FIG. 15 is a diagram illustrating a method for retransmission in a WLAN system according to another embodiment.
  • the AP 1500 shown in FIG. 15 corresponds to the AP 1100 mentioned in FIG.
  • the WUR terminal 1510 illustrated in FIG. 15 corresponds to the third WUR terminal 1130 among the plurality of WUR terminals mentioned in FIG. 11.
  • the wakeup sections TW to T1 of FIG. 15 and the first sections T1 to T2 of FIG. 15 are described for the wakeup sections TW to T1 of FIG. 14 and the first sections T1 to T2 of FIG. 14. Can be understood on the basis of
  • the frame may not be received.
  • the WUR terminal 1510 indicated by the first wakeup packet WUP # 1 may transmit a PS-poll frame to inform the AP 1500 of operating in normal mode.
  • the AP 1500 may not receive the PS-poll frame due to external factors (eg, channel conditions).
  • the AP 1500 may perform retransmission for the first wakeup packet WUP # 1 without transmitting a separate trigger frame.
  • the AP may select a second wakeup packet WUP # 2 for at least one WUR terminal and at least one main radio module included in the at least one WUR terminal.
  • the downlink packet may be transmitted together based on the OFDMA.
  • the AP 1500 may include a second wakeup packet WUP # 2 for the WUR module 1512 included in the WUR terminal 1510 and a main radio module 1511 included in the WUR terminal 1510.
  • Null data packet (NDP) for the same may be transmitted on the basis of OFDMA.
  • the second wakeup packet WUP # 2 and the at least one null data packet NDP may be transmitted in overlapping time resources.
  • the WUR terminal 1510 may operate in a normal mode. Accordingly, the WUR terminal 1510 may receive a null data packet NDP.
  • the WUR terminal 1510 may transmit an ACK frame in response to a null data packet.
  • the ACK frame may be transmitted based on the main radio module 1511.
  • a trigger frame for triggering at least one uplink transmission from at least one wireless terminal may be transmitted in place of a null data packet (NDP).
  • NDP null data packet
  • the AP may transmit a wakeup packet (WUP) and a null data packet (NDP) together for retransmission based on OFDMA.
  • WUP wakeup packet
  • NDP null data packet
  • the WUR terminal targeted for retransmission may receive one of the wakeup packet (WUP) and the null data packet (NDP) and then reply to the corresponding packet to the AP. That is, the AP can accurately determine the power state of the WUR terminal to be retransmitted. According to the present embodiment, it will be appreciated that unnecessary power consumed by the WUR terminal may be reduced.
  • WUP wakeup packet
  • NDP null data packet
  • 16 is a conceptual diagram illustrating a method of performing retransmission based on OFDMA in a WLAN system according to an embodiment.
  • the horizontal axis of FIG. 16 represents a time domain and the vertical axis represents a frequency domain.
  • the header of FIG. 16 may be transmitted based on the entire bandwidth of a specific band.
  • the overall bandwidth may be 20 MHz or 80 MHz.
  • the plurality of HE PPDUs and WUR PPDUs of FIG. 16 may be transmitted based on other frequency resources on overlapping time resources.
  • the plurality of HE PPDUs may include a null data packet (NDP).
  • NDP null data packet
  • the WUR PPDU may include a wakeup packet according to retransmission.
  • 17 is a flowchart illustrating a method of performing retransmission in the WLAN system according to the present embodiment.
  • an AP is configured for a plurality of wireless terminals (ie, a plurality of WUR terminals) including a plurality of main radio modules and a plurality of wake-up radio modules.
  • One wake-up packet may be transmitted.
  • the first wakeup packet may instruct the plurality of main radio modules to enter an activated state.
  • the first wakeup packet may be modulated according to an on-off keying (OOK) technique.
  • OOK on-off keying
  • the AP may determine whether at least one PS-poll frame is received in response to the first wakeup packet from the at least one wireless terminal among a plurality of wireless terminals.
  • the procedure ends.
  • the AP may transmit the buffered downlink data packet to the plurality of wireless terminals.
  • step S1730 is performed.
  • step S1730 the AP transmits a second wakeup packet for at least one wireless terminal and a downlink packet for at least one main radio module included in the at least one wireless terminal based on Orthogonal Frequency Division Multiplexing Access (OFDMA) can do.
  • OFDMA Orthogonal Frequency Division Multiplexing Access
  • the at least one second wakeup packet may be modulated according to the OOK technique.
  • the downlink packet may be at least one null data packet or a trigger frame that triggers at least one uplink transmission from at least one wireless terminal.
  • each wireless terminal may be as follows.
  • the second wakeup packet may be received based on at least one WUR module included in the at least one wireless terminal.
  • the AP may receive at least one PS-poll frame in response to the second wakeup packet from the at least one wireless terminal.
  • the downlink packet may be received based on at least one main radio module included in the at least one wireless terminal.
  • the AP may receive at least one ACK frame in response to the downlink packet from the at least one wireless terminal.
  • FIG. 18 is a block diagram illustrating a wireless device to which the present embodiment can be applied.
  • a wireless device may be implemented as an AP or a non-AP STA as an STA capable of implementing the above-described embodiment.
  • the wireless device may correspond to the above-described user, or may correspond to a transmitting terminal for transmitting a signal to the user.
  • the wireless device of FIG. 18 includes a processor 1810, a memory 1820 and a transceiver 1830 as shown.
  • the illustrated processor 1810, memory 1820, and transceiver 1830 may be implemented as separate chips, or at least two blocks / functions may be implemented through one chip.
  • the transceiver 1830 is a device including a transmitter and a receiver. When a specific operation is performed, only one of the transmitter and the receiver may be performed, or both the transmitter and the receiver may be performed. have.
  • the transceiver 1830 may include one or more antennas for transmitting and / or receiving wireless signals.
  • the transceiver 1830 may include an amplifier for amplifying a received signal and / or a transmitted signal and a bandpass filter for transmission on a specific frequency band.
  • the processor 1810 may implement the functions, processes, and / or methods proposed herein.
  • the processor 1810 may perform an operation according to the present embodiment described above. That is, the processor 1810 may perform the operation disclosed in the embodiment of FIGS. 1 to 17.
  • the processor 1810 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a data processing device, and / or a converter for translating baseband signals and wireless signals.
  • ASIC application-specific integrated circuit
  • Memory 1820 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.
  • ROM read-only memory
  • RAM random access memory
  • flash memory memory cards, storage media, and / or other storage devices.
  • FIG. 19 is a block diagram illustrating an example of an apparatus included in a processor. For convenience of description, an example of FIG. 19 is described based on a block for a transmission signal, but it is obvious that the reception signal can be processed using the block.
  • the illustrated data processor 1910 generates transmission data (control data and / or user data) corresponding to the transmission signal.
  • the output of the data processor 1910 may be input to the encoder 1920.
  • the encoder 1920 may perform coding through a binary convolutional code (BCC) or a low-density parity-check (LDPC) technique. At least one encoder 1920 may be included, and the number of encoders 1920 may be determined according to various information (eg, the number of data streams).
  • BCC binary convolutional code
  • LDPC low-density parity-check
  • the output of the encoder 1920 may be input to the interleaver 1930.
  • the interleaver 1930 performs an operation of distributing consecutive bit signals over radio resources (eg, time and / or frequency) to prevent burst errors due to fading or the like.
  • Radio resources eg, time and / or frequency
  • At least one interleaver 1930 may be included, and the number of the interleaver 1930 may be determined according to various information (eg, the number of spatial streams).
  • the output of the interleaver 1930 may be input to a constellation mapper 1940.
  • the constellation mapper 1940 performs constellation mapping such as biphase shift keying (BPSK), quadrature phase shift keying (QPSK), quadrature amplitude modulation (n-QAM), and the like.
  • the output of the constellation mapper 1940 may be input to the spatial stream encoder 1950.
  • the spatial stream encoder 1950 performs data processing to transmit the transmission signal through at least one spatial stream.
  • the spatial stream encoder 1950 may perform at least one of space-time block coding (STBC), cyclic shift diversity (CSD) insertion, and spatial mapping on a transmission signal.
  • STBC space-time block coding
  • CSS cyclic shift diversity
  • the output of the spatial stream encoder 1950 may be input to an IDFT 1960 block.
  • the IDFT 1660 block performs an inverse discrete Fourier transform (IDFT) or an inverse Fast Fourier transform (IFFT).
  • IDFT inverse discrete Fourier transform
  • IFFT inverse Fast Fourier transform
  • the output of the IDFT 1960 block is input to the Guard Interval (GI) inserter 1970, and the output of the GI inserter 1970 is input to the transceiver 1930 of FIG. 19.
  • GI Guard Interval

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

Abstract

Un procédé pour effectuer une retransmission dans un système de réseau LAN sans fil réalisé par un point d'accès (AP) selon un mode de réalisation comprend les étapes consistant à : transmettre un premier paquet de réveil pour une pluralité de terminaux sans fil comprenant une pluralité de modules radio principaux et une pluralité de modules radios de réveil (WUR), le premier paquet de réveil ordonnant à la pluralité de modules radio principaux d'entrer dans un état activé, et le premier paquet de réveil étant modulé conformément à une technique de modulation de marche/arrêt (OOK); et, si au moins une trame d'interrogation PS n'est pas reçue d'au moins un terminal sans fil parmi la pluralité de terminaux sans fil en réponse au premier paquet de réveil, transmettre, selon OFDMA, un second paquet de réveil pour au moins un terminal sans fil et un paquet de liaison descendante pour les modules radio principaux, le second paquet de réveil étant modulé conformément à une technique OOK.
PCT/KR2018/004169 2017-04-10 2018-04-10 Procédé pour effectuer une retransmission dans un système de réseau lan sans fil et terminal sans fil utilisant ce dernier WO2018190599A1 (fr)

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