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WO2018056679A1 - Procédé de réception de trame dans un système lan sans fil, et terminal sans fil utilisant ce procédé - Google Patents

Procédé de réception de trame dans un système lan sans fil, et terminal sans fil utilisant ce procédé Download PDF

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Publication number
WO2018056679A1
WO2018056679A1 PCT/KR2017/010277 KR2017010277W WO2018056679A1 WO 2018056679 A1 WO2018056679 A1 WO 2018056679A1 KR 2017010277 W KR2017010277 W KR 2017010277W WO 2018056679 A1 WO2018056679 A1 WO 2018056679A1
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WIPO (PCT)
Prior art keywords
wireless terminal
wur
channel
bss
module
Prior art date
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Ceased
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PCT/KR2017/010277
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English (en)
Korean (ko)
Inventor
박현희
류기선
김서욱
김정기
조한규
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LG Electronics Inc
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LG Electronics Inc
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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
    • 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
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • 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 receiving a frame performed by a wireless terminal including a main radio module and a wake-up receiver (WUR) module in a wireless LAN system, and a wireless terminal using the same. will be.
  • a wireless terminal including a main radio module and a wake-up receiver (WUR) module in a wireless LAN 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 receiving a frame in a WLAN system having an improved performance and a wireless terminal using the same.
  • a method for receiving a frame performed by a first wireless terminal including a main radio module and a WUR module in a wireless LAN system corresponds to a basic service set (BSS) to which the second wireless terminal belongs.
  • a WUR target beacon frame including basic service set color (BSS) information and channel information indicating a data channel for communicating with a second wireless terminal is received from a second wireless terminal, and receives a WUR target.
  • BSS basic service set color
  • the main radio module is in an inactive state; Determining whether connectivity with the second wireless terminal is maintained based on the BSS color information and the channel information; And instructing the main radio module to enter an activated state according to the determination.
  • a method for receiving a frame 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 illustrates BSS color information in a multi-BSS environment according to an exemplary embodiment.
  • FIG. 11 is a diagram illustrating channelization of a wireless channel for communication based on 2.4 GHz band in a WLAN system according to an exemplary embodiment.
  • FIG. 12 is a conceptual diagram illustrating channelization of a wireless channel for communication based on 5 GHz band in a WLAN system according to an embodiment of the present invention.
  • FIG. 13 is a diagram illustrating a WUR target beacon frame for a WUR module according to one embodiment.
  • FIG. 14 is a flowchart illustrating a method of receiving a frame in a WLAN system according to an exemplary embodiment.
  • 15 is a flowchart illustrating a method of receiving a frame in a WLAN system according to another exemplary embodiment.
  • 16 is a block diagram illustrating a wireless terminal to which an embodiment of the present specification can be applied.
  • 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, the signals to be improved in the present embodiment 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 this 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 module including 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 receive a specific type of frame (eg, a beacon frame transmitted periodically) transmitted by another wireless terminal (eg, 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 comprising a main radio module 411 in an inactive state may receive a frame transmitted by another wireless terminal (e.g., AP) until the main radio module is woken up by the WUR module 412. For example, it is not possible to receive an 802.11 type PPDU).
  • a wireless terminal including the main radio module 411 in an inactive state may not receive a beacon frame 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 that is in an active state (ie, in an ON state) may receive a frame (eg, an 802.11 type PPDU) transmitted by another wireless terminal (eg, an AP).
  • a frame eg, an 802.11 type PPDU
  • another wireless terminal eg, an AP
  • the wireless terminal referred to herein can operate the WUR module in a turn-off state or in a turn-on state.
  • a wireless terminal that includes a WUR module 412 in a turn-on state can only receive certain types of frames transmitted by other wireless terminals.
  • a specific type of frame may be understood as a frame modulated by an on-off keying (OOK) modulation scheme described below with reference to FIG. 5.
  • OOK on-off keying
  • a wireless terminal that includes a WUR module 412 in a turn-off state cannot receive certain types of frames transmitted by other wireless terminals.
  • 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 or the WUR module 412 in an activated 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 remain turned on for a duration in which the main radio module 411 is inactive.
  • 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 a 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 may be in an inactive state (ie, an OFF state), and the WUR module 412 may be in a turn-on state (ie, an ON state).
  • 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.
  • the WUR module 512 may transmit data to the main radio module 511 after the wakeup packet 521.
  • the wakeup signal 523 may be transmitted to the main radio module 511 to correctly receive the packet 522.
  • 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 be set to transmit the wakeup packet 521 to the first wireless terminal 510.
  • the second wireless terminal 520 instructs the main radio module 511 of the first wireless terminal 510 to enter an activated state (ie, an ON state) according to the wakeup packet 521. can do.
  • 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 wakeup packet 600 may include a payload 620 after the legacy preamble 610.
  • the payload 620 may be modulated by a simple modulation scheme (eg, an On-Off Keying (OOK) modulation scheme).
  • OOK On-Off Keying
  • the wakeup packet 600 including the payload may be relatively small. It may be transmitted based on 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.
  • an L-SIG field for protecting a packet may be used.
  • the 802.11 STA may detect the beginning of a packet through the L-STF field in the legacy preamble 610.
  • the STA may detect an end portion of the 802.11 packet through the L-SIG field in the legacy preamble 610.
  • 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.
  • the legacy preamble 610 may be understood as a field for a third party legacy STA (STA that does not include the LP-WUR). In other words, the legacy preamble 610 may not be decoded by the LP-WUR.
  • 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) according to the present embodiment may be implemented based on an ON-signal and an OFF-signal.
  • the OOK technique may be applied to the ON-signal included in the payload of the wakeup packet WUP (eg, 620 of FIG. 6).
  • the on signal may be a signal having an actual power value.
  • the ON signal included in the payload is N2 among N1 subcarriers (N1 is a natural number) corresponding to the channel band of the wakeup packet (WUP). Can be obtained by performing IFFT on the subcarriers N2 is a natural number.
  • 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 for the OFF-signal included in the payload (eg, 620 of FIG. 6) of the wakeup packet WUP.
  • the off signal may be a signal that does not have an actual power value. That is, the off signal may not be considered in the configuration of the wakeup packet (WUP).
  • the ON signal included in the payload (620 of FIG. 6) of the wakeup packet WUP is determined as a 1-bit ON signal (ie, '1') by the WUR module (eg, 512 of FIG. 5) That is, demodulation).
  • the off 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) may be increased, and the power consumption for conversion in the AC / DC converter of the receiver may be reduced.
  • SNR signal to noise ratio
  • 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 have N2 (e.g., 13 consecutive) subs of N1 (e.g., 64) subcarriers corresponding to the channel band (e.g., 20 MHz band) of the wake-up packet.
  • N2 e.g., 13 consecutive
  • subs of N1 e.g., 64
  • IFFT e.g., 64-point IFFT
  • 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 wireless terminal eg, 510 of FIG. 5 including a WUR module (eg, 512 of FIG. 5) demodulates a received packet based on an envelope detector that extracts an envelope of the received signal. (demodulate)
  • 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).
  • FIG. 10 illustrates BSS color information in a multiple BSS environment (or an overlapping BSS environment) according to an exemplary embodiment.
  • each BSS (BSS # 1, BSS # 2).
  • BSS # 1 and BSS # 2 may be understood as an infrastructure BSS, which is a kind of infrastructure network.
  • the first BSS (BSS # 1) may include a first AP (AP # 1) and a first STA (STA # 1) coupled with the first AP (AP # 1).
  • the second BSS (BSS # 2) may include a second AP (AP # 2) and a second STA (STA # 2) coupled with the second AP (AP # 2).
  • the first AP AP # 1 may be understood as an entity providing a connection to the distribution system DS to the first STA STA # 1 through a wireless medium.
  • the second AP AP # 2 may be understood as an entity providing a connection to the distribution system DS to the second STA STA # 2 via the wireless medium.
  • first STA STA # 1
  • second STA STA # 2
  • WUR module ie, 512 of FIG. 5
  • each wireless terminal eg, AP or STA
  • the degree of influence by other BSSs in the vicinity may vary. That is, each wireless terminal (eg, AP or STA) may detect communication environment information.
  • the communication environment information may be local information detected by the wireless terminal.
  • the local information may be understood as a numerical value (or information) that changes according to a change in the positional relationship of the wireless terminal with respect to other wireless terminals.
  • the communication environment information may include BSS color (Basic Service Set color) information.
  • the BSS color information may be 6-bit information set by each AP (AP # 1, AP # 2) belonging to each BSS (BSS # 1, BSS # 2).
  • the BSS color information (hereinafter, referred to as 'BCI') may be set to any one of '0' to '63'.
  • the BSS color information BCI may be an identifier of a BSS (eg, BSS # 1, BSS # 2).
  • BSS color information (BCI) may be used to help the receiving terminal to identify the BSS.
  • the HE STA transmitting the HE Operation element or the BSS Color Change Announcement element may be understood as not being a non-AP STA combined with the HE AP.
  • the HE STA transmitting the HE Operation element or the BSS Color Change Announcement element may select a BSS color value for inclusion in the BSS Color subfield of the HE Operation element or the New BSS Color subfield of the BSS Color Change Announcement element.
  • the BSS color value may be set to any one of '0' to '63'.
  • the HE STA may maintain a single value of the BSS Color subfield for the lifetime of the BSS (or until the BSS color information is changed).
  • the HE STA transmitting the HE operation element may set the TXVECTOR parameter BSS_COLOR of the HE PPDU to a value indicated by the BSS Color subfield of the HE operation element.
  • the BSS color information BCI according to the present embodiment may be included in the HE PPDU as shown in FIG. 3.
  • the BSS color information may be included in the HE-SIG A field of the HE PPDU.
  • the first BSS color information BCI_1 for the first BSS may be set to N1 (N1 is a natural number).
  • the second BSS color information BCI_2 for the second BSS may be set to N2 (N1 is a natural number).
  • the first AP AP # 1 may transmit a frame including the first BSS color information BCI_1.
  • the second AP AP # 2 may transmit a frame including the second BSS color information BCI_2.
  • the first STA (STA # 1) may receive only a frame including the first BSS color information BCI_1. That is, the first STA (STA # 1) may ignore the frame including the second BSS color information BCI_2 from the second AP (AP # 2) of the second BSS (BSS # 2).
  • the first STA (STA # 1) is a BSS (ie, BSS # 1) to which the BSS color information acquired through the HE-SIG A field of the HE PPDU of the received frame belongs to the first STA (STA # 1).
  • the remaining part of the HE PPDU ie, the part corresponding to the HE-SIG A field
  • the second STA (STA # 2) may receive only a frame including the second BSS color information BCI_2. That is, the second STA (STA # 2) may ignore the frame including the first BSS color information BCI_1 from the first AP (AP # 1) of the second BSS (BSS # 1).
  • the second STA is a BSS (ie, BSS # 2) to which the BSS color information acquired through the HE-SIG A field of the HE PPDU of the received frame belongs to the second STA (STA # 2).
  • the remaining portion of the HE PPDU ie, the portion corresponding to the HE-SIG A field
  • FIG. 11 is a diagram illustrating channelization of a wireless channel for communication based on 2.4 GHz band in a WLAN system according to an exemplary embodiment.
  • the horizontal axis of FIG. 11 may represent a frequency (GHz) for the 2.4 GHz band.
  • the vertical axis of FIG. 11 may be associated with the presence of a channel.
  • the first to thirteenth channels ch # 1 to ch # 13 may be allocated.
  • a bandwidth (BW) for each of the first to thirteenth channels ch # 1 to ch # 13 may be 22 MHz.
  • the first channel center frequency fc1 for the first channel ch # 1 of FIG. 11 may be 2.412 GHz.
  • the first channel ch # 1 may be defined between 2.401 GHz and 2.423 GHz.
  • the second channel center frequency fc2 for the second channel ch # 2 may be 2.417 GHz.
  • the second channel ch # 2 may be defined between 2.406 GHz and 2.428 GHz.
  • the third channel center frequency fc3 for the third channel ch # 3 of FIG. 11 may be 2.422 GHz.
  • the third channel ch # 3 may be defined between 2.411 GHz and 2.433 GHz.
  • the fourth channel center frequency fc4 for the fourth channel ch # 4 may be 2.427 GHz.
  • the third channel ch # 3 may be defined between 2.416 GHz and 2.438 GHz.
  • the fifth channel center frequency fc5 for the fifth channel ch # 5 of FIG. 11 may be 2.432 GHz.
  • the fifth channel ch # 5 may be defined between 2.421 GHz and 2.443 GHz.
  • the sixth channel center frequency fc6 for the sixth channel ch # 6 may be 2.437 GHz.
  • the sixth channel ch # 6 may be defined between 2.426 GHz and 2.448 GHz.
  • the seventh channel center frequency fc7 for the seventh channel ch # 7 of FIG. 11 may be 2.442 GHz.
  • the seventh channel ch # 7 may be defined between 2.431 GHz and 2.453 GHz.
  • the eighth channel center frequency fc8 for the eighth channel ch # 8 may be 2.447 GHz.
  • the eighth channel ch # 8 may be defined between 2.436 GHz and 2.458 GHz.
  • the ninth channel center frequency fc9 for the ninth channel ch # 9 of FIG. 11 may be 2.452 GHz.
  • the ninth channel ch # 9 may be defined between 2.441 GHz and 2.463 GHz.
  • the tenth channel center frequency fc10 for the tenth channel ch # 10 may be 2.457 GHz.
  • the tenth channel ch # 10 may be defined between 2.446 GHz and 2.468 GHz.
  • the eleventh channel center frequency fc11 for the eleventh channel ch # 11 of FIG. 11 may be 2.462 GHz.
  • the eleventh channel ch # 11 may be defined between 2.451 GHz and 2.473 GHz.
  • the twelfth channel center frequency fc12 for the twelfth channel ch # 12 may be 2.467 GHz.
  • the twelfth channel ch # 12 may be defined between 2.456 GHz and 2.478 GHz.
  • the thirteenth channel center frequency fc13 for the thirteenth channel ch # 13 of FIG. 11 may be 2.472 GHz.
  • the thirteenth channel ch # 13 may be defined between 2.461 GHz and 2.483 GHz.
  • the fourteenth channel center frequency fc14 for the fourteenth channel ch # 14 of FIG. 11 may be 2.482 GHz.
  • the fourteenth channel ch # 14 may be defined between 2.473 GHz and 2.495 GHz.
  • the twelfth channel ch # 12 and the thirteenth channel ch # 13 may be used in most countries except the United States.
  • the fourteenth channel ch # 14 is used only in Japan.
  • the first channel ch # 1, the sixth channel ch # 6, and the eleventh channel ch # 11 indicated by solid lines may be understood as independent channels that do not overlap each other in the frequency domain.
  • the channelization scheme of the wireless channel for communication based on the 2.4 GHz band shown in FIG. 11 is just an example, and it will be understood that the present specification is not limited thereto.
  • FIG. 12 is a conceptual diagram illustrating channelization of a wireless channel for communication based on 5 GHz band in a WLAN system according to an exemplary embodiment.
  • a plurality of channels having 20 MHz, 40 MHz, 80 MHz, and 160 MHz bandwidths are shown to support the operation of the wireless terminal according to the exemplary embodiment in the 5 GHz band.
  • the 36th channel (ch # 36) having a center frequency of 5.180 GHz
  • the 40th channel (ch # 40) having a center frequency of 5.200 GHz
  • the 44th channel (ch # 44) having a center frequency of 5.220 GHz.
  • channel 48 (ch # 48) having a center frequency of 5.240 GHz.
  • channel 52 having a center frequency of 5.260 GHz
  • Channel 56 having a center frequency of 5.280 GHz
  • Channel 60 having a center frequency of 5.300 GHz
  • channel 64 having a center frequency of 5.320 GHz.
  • channel 100 having a center frequency of 5.500 GHz
  • Channel 104 having a center frequency of 5.520 GHz
  • Channel 108 having a center frequency of 5.540 GHz
  • Channel 112 having a center frequency of 5.560 GHz
  • Channel 116 with a center frequency of 5.580 GHz
  • Channel 120 (ch # 120) of a center frequency of 5.600 GHz
  • center frequency There may be channel 124 (ch # 124) having a value of 5.620 GHz.
  • channel 128 (ch # 128) having a center frequency of 5.640 GHz
  • Channel 132 (ch # 104) having a center frequency of 5.660 GHz
  • Channel 136 (ch # 136) having a center frequency of 5.680 GHz
  • channel 140 (ch # 140) having a center frequency of 5.700 GHz
  • channel 144 (ch # 144) having a center frequency of 5.720 GHz.
  • channel 149 (ch # 149) having a center frequency of 5.745 GHz
  • Channel 153 (ch # 153) having a center frequency of 5.765 GHz
  • Channel 157 (ch # 157) having a center frequency of 5.785 GHz
  • channel 161 (ch # 161) having a center frequency of 5.805 GHz
  • channel 165 (ch # 165) having a center frequency of 5.825 GHz.
  • 12 non-overlapping channels having a 40 MHz bandwidth based on channel bonding in the 5 GHz band may be provided.
  • the channelization scheme of the wireless channel for 5GHz band-based communication shown in FIG. 12 is merely an example, and it will be understood that the present specification is not limited thereto.
  • FIG. 13 is a diagram illustrating a WUR target beacon frame for a WUR module according to one embodiment.
  • the horizontal axis of FIG. 13 may correspond to time t, and the vertical axis may be associated with the existence of a frame.
  • the AP 1300 of FIG. 13 may be understood to correspond to the second wireless terminals (eg, 420 and 520) of FIGS. 4 and 5.
  • the AP 1300 of FIG. 13 may be understood to correspond to the first AP AP # 1 and the second AP AP # 2 of FIG. 10.
  • the AP 1300 may transmit a first main target beacon frame (hereinafter referred to as “MTBF1”).
  • the first main target beacon frame MTBF1 may include various control information for connection between the AP and the STA.
  • the main target beacon frame (MTBF) is a kind of management frame, and is included in the beacon frame of Section 9.3.3.3 of IEEE Draft P802.11-REVmc TM / D8.0 disclosed in August 2016. It can be understood to correspond.
  • the main target beacon frame MTBF may be transmitted by the AP 1300 according to a beacon interval (“BI”) according to a predetermined time period.
  • BI beacon interval
  • the beacon intervals BI, T1 to T3 may be 100 ms.
  • the AP 1300 may include a first WUR target beacon frame (WUR Target Beacon Frame) for the WUR modules (eg, 412 and 512) of FIGS. 4 and 5. 'WTBF1') can be transmitted.
  • WUR Target Beacon Frame WUR Target Beacon Frame
  • the WUR target beacon frame (WTBF) according to the present embodiment may be transmitted by the AP 1300 according to a WUR Beacon Interval (WUR BI) according to a predetermined period.
  • WUR BI WUR Beacon Interval
  • the WUR target beacon frame WTBF may include a plurality of information elements as shown in Table 1 below.
  • the WUR target beacon frame WTBF may be transmitted at a shorter period than the main target beacon frame MTBF.
  • the wireless terminal may maintain the connection with the AP by receiving the WUR target beacon frame (WTBF) transmitted in a short period without receiving the main target beacon frame (MTBF).
  • the WUR target beacon frame WTBF may be transmitted at a longer period than the main target beacon frame MTBF.
  • the wireless terminal may maintain the connection with the AP by receiving the WUR target beacon frame (WTBF) transmitted in a long cycle without receiving the main target beacon frame (MTBF).
  • the WUR target beacon frame may be transmitted at the same period as the main target beacon frame (MTBF).
  • the WUR target beacon frame WTBF may be defined as an information element and included in the main target beacon frame MTBF.
  • the WUR target beacon frame WTBF may be transmitted at a different time point than the main target beacon frame MTBF with the same period as the main target beacon frame MTBF.
  • the AP 1300 may transmit the second main target beacon frame MTBF2 according to the beacon interval BI.
  • the AP 1300 may transmit a second WUR target beacon frame WTBF2 according to the WUR beacon interval WUR BI.
  • the WUR target beacon frame (WTBF) of FIG. 13 is shown to be periodically transmitted by the AP 1300, but this is only an example, and may be transmitted in an eventual manner as in the wake-up packet (WUP) illustrated in FIG. 5. It will be understood.
  • a first wireless terminal ie, 510 of FIG. 5, STA # 1 of FIG. 5
  • a WUR module eg, 412, 512
  • the 802.11 based main radio module ie, 511 of FIG. 5 may be instructed to remain in an inactive state (ie, an OFF state).
  • the AP 1300 may include various control information for connection between the AP and the wireless terminal in the WUR target beacon frame (WTBF) for the WUR module (for example, 412, 512).
  • WTBF WUR target beacon frame
  • control information may include the BSS color information (BCI) mentioned through FIG. 10.
  • BCI BSS color information
  • a first wireless terminal ie, 510 of FIG. 5 and STA # 1 of FIG. 10 is configured to display BSS color information of an existing BSS (that is, BSS # 1 of FIG. 10). That is, it may be assumed that a value corresponding to BSS color # 1 of FIG. 10 (that is, N1 of FIG. 10) is stored in advance.
  • the first radio terminal (i.e., 510 of FIG. 5, STA # 1 of FIG. 10) in which the main radio module (i.e., 511 of FIG. 5) is in an inactive state (i.e., OFF state) is a conventional BSS (i.e., FIG. 10).
  • 10 may move from a first point (ie, P1 of FIG. 10) belonging to BSS # 1 of FIG. 10 to a second point (ie, P2 of FIG. 10) belonging to another BSS (ie, BSS # 2 of FIG. 10).
  • the BUR color beacon frame (WTBF) transmitted from another second wireless terminal (that is, AP # 2 of FIG. 10) belonging to another BSS (that is, BSS # 2 of FIG. A value corresponding to BSS color # 2 of FIG. 10 (ie, N2 of FIG. 10) may be included.
  • a WUR target beacon frame (WTBF) including different BSS color information (that is, BSS color # 2 of FIG. 10) from the existing one is assigned to a WUR of a first wireless terminal (ie, 510 of FIG. 5 and STA # 1 of FIG. 10). It may be received based on the module (ie, 512 of FIG. 5). In this case, the first wireless terminal (ie, 510 of FIG. 5 and STA # 1 of FIG. 10) is activated (ie, ON) when the main radio module (511 of FIG. 5) is inactive (ie, OFF). May be instructed to enter.
  • WTBF WUR target beacon frame
  • the first wireless terminal (ie, 510 of FIG. 5 and STA # 1 of FIG. 10) according to an embodiment of the present disclosure may select a main radio module (ie, 510 of FIG. 5) that is in an active state (that is, ON state).
  • a main target beacon frame (MTBF) transmitted by another second wireless terminal (ie, AP # 2 of FIG. 10) belonging to another BSS (ie, BSS # 2 of FIG. 10) may be received.
  • MTBF main target beacon frame
  • the wireless terminal ie, 510 of FIG. 5 and STA # 1 of FIG. 10
  • the wireless terminal may perform an association procedure with a second wireless terminal (ie, AP # 2 of FIG. 10).
  • control information may include channel information according to channelization mentioned through FIGS. 11 and 12.
  • a first wireless terminal ie, 510 of FIG. 5 and STA # 1 of FIG. 10 is a first point belonging to an existing BSS (ie, BSS # 1 of FIG. 10). (Ie, P1 in FIG. 10).
  • a second wireless terminal (ie AP # 1 of FIG. 10) belonging to an existing BSS (ie, BSS # 1 of FIG. 10) may change a preset data channel for data transmission.
  • the data channel preset for data transmission may be understood as one of a plurality of channels according to channelization of FIGS. 10 and 11.
  • the first radio terminal i.e., 510 of FIG. 5, STA # 1 of FIG. 10 in which the main radio module (i.e., 510 of FIG. 5) is in an inactive state (i.e., OFF state) is a WUR module (i.e., FIG. Based on 512, a WUR target beacon frame (WTBF) may be received.
  • WTBF WUR target beacon frame
  • the first wireless terminal receives the WUR target beacon which has received channel information indicating the data channel changed by the second wireless terminal (ie, AP # 1 of FIG. 10). It can acquire based on the frame WTBF.
  • the first wireless terminal may instruct the main radio module (511 of FIG. 5) to enter an activation state (ie, an ON state).
  • the first wireless terminal may instruct the main radio module (511 of FIG. 5) to hop to the changed data channel.
  • the first wireless terminal ie, 510 of FIG. 5 and STA # 1 of FIG. 10
  • the second wireless terminal ie, through the changed data channel based on the main radio module (511 of FIG. 5) in an activated state. 10
  • a data packet can be directly received from AP # 1 of FIG.
  • a WUR channel which is a channel for receiving a wakeup packet (WUP), and a data channel for receiving a data packet may be allocated to different channels.
  • WUP wakeup packet
  • the WUR channel and the data channel may be set to have a fixed channel within the same channel band (eg, 2.4 GHz).
  • the WUR channel may be fixed to the first channel ch # 1 of FIG. 10
  • the data channel may be fixed to the sixth channel ch # 6 of FIG. 10.
  • the WUR channel and the data channel may be set to have a dynamic channel within the same channel band (eg, 2.4 GHz).
  • the WUR channel and the data channel may be set to different channel bands.
  • the WUR channel may be defined in the 2.4 GHz band of FIG. 10
  • the data channel may be defined in the 5 GHz band of FIG. 11.
  • each of the WUR channel and the data channel may be assigned a fixed channel or a dynamic channel within a defined channel band.
  • the WUR channel and the data channel can be understood as a dynamic channel without restriction on the channel band.
  • control information for connection between an AP and an STA is transmitted based on a WUR beacon frame, but information included in a WUR beacon frame (WUR BF) such as a channel switch announcement element defined in an existing standard. It may be defined as an information element.
  • WUR BF WUR beacon frame
  • channel switch announcement element For reference, a detailed description of the channel switch announcement element is referred to through section 9.4.2.19 of IEEE Draft P802.11-REVmc TM / D8.0 disclosed in August 2016.
  • FIG. 14 is a flowchart illustrating a method of receiving a frame in a WLAN system according to an exemplary embodiment.
  • the first wireless terminal referred to in FIG. 14 may correspond to the receiving terminal 510 of FIG. 5. That is, the first wireless terminal of FIG. 14 may include a main radio module 511 of FIG. 5 and a WUR module 512 of FIG. 5.
  • the main radio module 511 of FIG. 5 of the first wireless terminal is in an inactive state (ie, OFF state) and only the WUR module (512 of FIG. 5) is in an active state.
  • have. 14 may be understood as a first STA (STA # 1) coupled with a first AP (AP # 1) of FIG. 10.
  • the second wireless terminal mentioned in FIG. 14 may correspond to the transmitting terminal 520 of FIG. 5.
  • the second wireless terminal referred to in FIG. 14 may be understood as a first AP (AP # 1) or a second AP (AP # 2) of FIG. 10.
  • the first wireless terminal may receive a WUR target beacon frame (hereinafter referred to as 'WTBF') from the second wireless terminal.
  • the WUR target beacon frame WTBF may include BSS color information (BCI) and data channel information.
  • the BSS color information may be information for identifying a unique BSS (Basic Service Set) to which the second wireless terminal belongs.
  • the second wireless terminal may transmit a packet including BSS color information (BCI) corresponding to a unique BSS to which the second wireless terminal belongs.
  • At least one first wireless terminal belonging to the same BSS as the second wireless terminal may receive only a packet including unique BSS color information (BCI). At least one first wireless terminal belonging to the same BSS as the second wireless terminal may ignore a packet including other BSS color information (BCI).
  • BCI unique BSS color information
  • the channel information may indicate a data channel for the first wireless terminal to communicate with the second wireless terminal.
  • the data channel may be understood as any one of the plurality of channels shown in FIGS. 11 and 12.
  • the first wireless terminal may determine whether connectivity with the second wireless terminal is maintained based on the BSS color information and the channel information. That is, the first wireless terminal can determine whether any one of the BSS color information and the channel information is changed.
  • the first wireless terminal may determine that the connection with the second wireless terminal is maintained. In this case, the procedure proceeds to step S1450.
  • the first wireless terminal may determine that the connection with the second wireless terminal cannot be maintained. In this case, the procedure proceeds to step S1430.
  • the first wireless terminal may instruct the main radio module to enter the activated state.
  • the description of this process is referred to through FIG. 5.
  • the first wireless terminal may determine that the connection with the second wireless terminal is not maintained.
  • operation S1430 may correspond to a case where the first STA (STA # 1) of FIG. 10 moves from the first point P1 to the second point P2.
  • the predetermined BSS color information may be understood as first BSS color information (ie, N1) for the first BSS (ie, BSS # 1 of FIG. 10) corresponding to the first point P1, which is the first point. .
  • the BSS color information received through the WUR target beacon frame WTBF may be understood as second BSS color information (ie, N2) for a second BSS (BSS # 2) corresponding to the second point P2.
  • the first wireless terminal may determine that the connection with the second wireless terminal is not maintained.
  • step S1430 when the first STA (STA # 1) of FIG. 10 stays at the first point P1, a channel allocated for the first STA (STA # 1) is changed. This may be the case.
  • the preset channel information is transmitted from the first STA (STA # 1) of FIG. 10 to the first AP (AP # 1) to transmit and receive data packets with the first AP (AP # 1) at the first point (P1).
  • STA # 1 STA # 1 of FIG. 10
  • AP # 1 the first AP (AP # 1) to transmit and receive data packets with the first AP (AP # 1) at the first point (P1).
  • P1 P1 point
  • the channel pre-allocated by the first AP AP # 1 may be the first channel ch # 1 of FIG. 10.
  • Channel information received through the WUR target beacon frame may be understood as a channel subsequently allocated by the first AP (AP # 1).
  • a channel subsequently allocated by the first AP AP # 1 may be the sixth channel ch # 6 of FIG. 10.
  • the first wireless terminal may receive a main target beacon frame (hereinafter, referred to as “MTBF”) based on the main radio module that has entered the activation state.
  • MTBF main target beacon frame
  • the main target beacon frame may be understood as the beacon frame referred to through section 9.3.3.1 of IEEE Draft P802.11-REVmc TM / D8.0 disclosed in August 2016.
  • the first wireless terminal may instruct the main radio module to maintain an inactive state.
  • the first wireless terminal may determine that the connection with the second wireless terminal is maintained.
  • operation S1450 may correspond to a case where the first STA (STA # 1) stays at the first point P1.
  • the preset BSS color information may include the first BSS color information for the first BSS (ie, BSS # 1 of FIG. 10) corresponding to the first point P1 of the first STA (STA # 1) of FIG. 10. That is, it can be understood as N1).
  • the BSS color information received through the WUR target beacon frame WTBF may correspond to a first BSS (BSS # corresponding to the first point P1). It can be understood as the first BSS color information (i.e., N1) for 1).
  • the first wireless terminal may determine that the connection with the second wireless terminal is maintained.
  • step S1450 when the first STA (STA # 1) of FIG. 10 stays at the first point P1, a channel allocated for the first STA (STA # 1) is not changed. If not, it may correspond.
  • the preset channel information is transmitted from the first STA (STA # 1) of FIG. 10 to the first AP (AP # 1) to transmit and receive data packets with the first AP (AP # 1) at the first point (P1).
  • STA # 1 STA # 1 of FIG. 10
  • AP # 1 the first AP (AP # 1) to transmit and receive data packets with the first AP (AP # 1) at the first point (P1).
  • P1 P1 point
  • the channel pre-allocated by the first AP AP # 1 may be the first channel ch # 1 of FIG. 10.
  • Channel information received through the WUR target beacon frame may be understood as a channel subsequently allocated by the first AP (AP # 1).
  • a channel subsequently allocated by the first AP AP # 1 may be the first channel ch # 1 of FIG. 10 that is the same as the pre-allocated channel.
  • 15 is a flowchart illustrating a method of receiving a frame in a WLAN system according to another exemplary embodiment.
  • step S1510 and S1520 of FIG. 15 may be replaced with the descriptions of the steps S1410 and S1420 of FIG. 14.
  • step S1560 of FIG. 15 may be replaced with the description of step S1450 of FIG. 14.
  • the first wireless terminal may determine whether to receive a wakeup packet (WUP) from the second wireless terminal.
  • WUP wakeup packet
  • step S1540 If the wakeup packet WUP is not received, the procedure ends. If the wakeup packet WUP is received, the procedure goes to step S1540.
  • the wakeup packet WUP for step S1530 may correspond to the wakeup packet WUP described with reference to FIG. 9.
  • the wakeup packet may include a payload modulated according to the (On-Off Keying) technique.
  • the payload may be implemented based on an ON signal and an OFF signal.
  • the ON signal may be determined as a 1-bit ON signal by the WUR module.
  • the on signal may be obtained by performing an Inverse Fast Fourier Transform (IFFT) on N2 (ie, natural) subcarriers among N1 (ie, natural) subcarriers corresponding to the channel band of the wakeup packet. have.
  • IFFT Inverse Fast Fourier Transform
  • a predetermined sequence may be applied to the N2 subcarriers.
  • the OFF signal may be determined as a 1-bit OFF signal by the WUR module.
  • the first wireless terminal that receives the wakeup packet WUP may instruct the main radio module to enter into an activated state.
  • the first radio terminal may instruct the main radio module to operate according to at least one of the BSS color information and the channel information.
  • the first wireless terminal may instruct the main radio module to receive a beacon frame including the changed BSS color information.
  • the first wireless terminal may instruct the main radio module to hop to the data channel indicated by the changed channel information. Subsequently, the first wireless terminal may instruct the main radio module to receive a data packet from the second wireless terminal through the hopped data channel.
  • 16 is a block diagram illustrating a wireless terminal to which an embodiment of the present specification can be applied.
  • a wireless terminal may be an STA or an AP or a non-AP STA that may implement the above-described embodiment.
  • the wireless terminal may correspond to the above-described user or may correspond to a transmitting terminal for transmitting a signal to the user.
  • the AP 1600 includes a processor 1610, a memory 1620, and an RF unit 1630.
  • the RF unit 1630 may be connected to the processor 1610 to transmit / receive a radio signal.
  • the processor 1610 may implement the functions, processes, and / or methods proposed herein. For example, the processor 1610 may perform an operation according to the present embodiment described above. The processor 1610 may perform an operation of the AP disclosed in the present embodiment of FIGS. 1 to 15.
  • the non-AP STA 1650 includes a processor 1660, a memory 1670, and an RF unit 1680.
  • the RF unit 1680 may be connected to the processor 1660 to transmit / receive a radio signal.
  • the processor 1660 may implement the functions, processes, and / or methods proposed in the present embodiment.
  • the processor 1660 may be implemented to perform the non-AP STA operation according to the present embodiment described above.
  • the processor 1660 may perform an operation of the non-AP STA disclosed in the present embodiment of FIGS. 1 to 15.
  • Processors 1610 and 1660 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters to convert baseband signals and wireless signals to and from each other.
  • the memories 1620 and 1670 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
  • the RF unit 1630 and 1680 may include one or more antennas for transmitting and / or receiving a wireless signal.
  • Modules may be stored in memories 1620 and 1670 and executed by processors 1610 and 1660.
  • the memories 1620 and 1670 may be inside or outside the processors 1610 and 1660, and may be connected to the processors 1610 and 1660 by various well-known means.

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

Abstract

Un procédé de réception d'une trame, exécuté au moyen d'un premier terminal sans fil comprenant un module radio principal et un module WUR dans un système LAN sans fil, selon un mode de réalisation de la présente invention, comprend les étapes consistant à : recevoir d'un second terminal sans fil une trame de balise cible WUR contenant des informations de couleur de BSS, qui correspondent à une BSS à laquelle appartient le second terminal sans fil, et des informations de canal qui indiquent un canal de données pour une communication avec le second terminal sans fil ; déterminer si la connexion avec le second terminal sans fil est maintenue sur la base des informations de couleur de BSS et des informations de canal ; et, sur la base de la détermination, indiquer à un module radio principal d'entrer dans un état activé, le module radio principal étant dans un état désactivé lorsque la trame de balise cible WUR est reçue sur la base d'un module WUR.
PCT/KR2017/010277 2016-09-21 2017-09-20 Procédé de réception de trame dans un système lan sans fil, et terminal sans fil utilisant ce procédé Ceased WO2018056679A1 (fr)

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US201662397359P 2016-09-21 2016-09-21
US62/397,359 2016-09-21
US201662410400P 2016-10-20 2016-10-20
US62/410,400 2016-10-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112352454A (zh) * 2018-09-04 2021-02-09 松下电器（美国）知识产权公司 占空比低功耗多用户传输的通信装置和通信方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020131371A1 (en) * 2000-11-02 2002-09-19 Sharp Laboratories Of America, Inc. Method to dynamically change all MIB parameters of a wireless data network
WO2014110397A1 (fr) * 2013-01-11 2014-07-17 Interdigital Patent Holdings, Inc. Procédé et appareil de communication dans un réseau d'ensemble de services de base à chevauchement wlan
WO2014142569A1 (fr) * 2013-03-15 2014-09-18 인텔렉추얼디스커버리 주식회사 Procédé et dispositif permettant de configurer une liaison multibande dans un système de réseau local sans fil
WO2015120488A1 (fr) * 2014-02-10 2015-08-13 Mediatek Inc. Méthode d'identification de bss de source dans un wlan

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020131371A1 (en) * 2000-11-02 2002-09-19 Sharp Laboratories Of America, Inc. Method to dynamically change all MIB parameters of a wireless data network
WO2014110397A1 (fr) * 2013-01-11 2014-07-17 Interdigital Patent Holdings, Inc. Procédé et appareil de communication dans un réseau d'ensemble de services de base à chevauchement wlan
WO2014142569A1 (fr) * 2013-03-15 2014-09-18 인텔렉추얼디스커버리 주식회사 Procédé et dispositif permettant de configurer une liaison multibande dans un système de réseau local sans fil
WO2015120488A1 (fr) * 2014-02-10 2015-08-13 Mediatek Inc. Méthode d'identification de bss de source dans un wlan

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SUHUA TANG ET AL.: "Wake-up receiver for radio-on-demand wireless LANs", EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING 2012, vol. 2012, no. 1, 9 February 2012 (2012-02-09) - 1 December 2012 (2012-12-01), pages 1 - 13, 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
CN112352454A (zh) * 2018-09-04 2021-02-09 松下电器（美国）知识产权公司 占空比低功耗多用户传输的通信装置和通信方法

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