WO2020197272A1 - Procédé et dispositif destinés à réaliser une communication optique sans fil dans un système lan sans fil - Google Patents

Procédé et dispositif destinés à réaliser une communication optique sans fil dans un système lan sans fil Download PDF

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Publication number
WO2020197272A1
WO2020197272A1 PCT/KR2020/004083 KR2020004083W WO2020197272A1 WO 2020197272 A1 WO2020197272 A1 WO 2020197272A1 KR 2020004083 W KR2020004083 W KR 2020004083W WO 2020197272 A1 WO2020197272 A1 WO 2020197272A1
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ppdu
sta
format
type
sig
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PCT/KR2020/004083
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English (en)
Korean (ko)
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김서욱
최진수
김정기
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엘지전자 주식회사
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    • 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
    • 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]

Definitions

  • the present specification relates to a technique for transmitting and receiving data in wireless communication, and more particularly, to a method and apparatus for performing wireless optical communication in a wireless LAN system.
  • WLAN wireless local area network
  • OFDMA orthogonal frequency division multiple access
  • MIMO downlink multi-user multiple input, multiple output
  • the new communication standard may be a Light Communication (LC) standard (ie, IEEE 802.11bb standard) that is being discussed recently.
  • the LC standard may be a standard for a wireless LAN system operating in the visible and infrared bands (ie, 380 nm to 5,000 nm wavelength) of 60 THz to 789 THz.
  • the minimum transmission rate is 10 Mbps and the maximum transmission rate can be set to at least 5 Gbps.
  • a wireless communication system may be required in consideration of a THz band of 300 GHz or higher, or a band of visible and infrared light.
  • a method performed by a receiving STA of a wireless local area network (WLAN) system is to receive a received PPDU including an L-SIG field from a transmitting STA through a wireless optical communication band, wherein the receiving STA is the first Supporting the PPDU of the first type among the PPDU of the type and the PPDU of the second type; Performing a modulo operation on the length value of the L-SIG field; Determining a format of the received PPDU as the first format of the first format and the second format based on the modulo operation; And transmitting and receiving data to and from the transmitting STA through the wireless optical communication band based on the received PPDU.
  • WLAN wireless local area network
  • an STA capable of communicating through a wireless optical communication band may be configured with at least one of a plurality of physical layers.
  • the optical communication STA may transmit a frame through one of a plurality of physical layers.
  • the optical communication STA may include information on one physical layer among a plurality of physical layers in a transmitted frame.
  • a transmitting STA and a receiving STA may efficiently perform communication in a wireless optical communication band.
  • FIG. 1 shows an example of a transmitting device and/or a receiving device of the present specification.
  • WLAN wireless LAN
  • FIG. 3 is a diagram illustrating a general link setup process.
  • FIG. 4 is a diagram showing an example of a PPDU used in the IEEE standard.
  • FIG. 5 is a diagram showing an arrangement of resource units (RU) used in a 20 MHz band.
  • FIG. 6 is a diagram showing an arrangement of a resource unit (RU) used in a 40 MHz band.
  • RU resource unit
  • RU 7 is a diagram showing the arrangement of resource units (RU) used in the 80MHz band.
  • FIG. 11 shows an example of a trigger frame.
  • FIG. 13 shows an example of a subfield included in a per user information field.
  • 15 shows an example of a channel used/supported/defined within a 2.4 GHz band.
  • 16 shows an example of a channel used/supported/defined within a 5 GHz band.
  • FIG. 17 shows an example of a channel used/supported/defined within a 6 GHz band.
  • 19 shows a modified example of the transmitting device and/or the receiving device of the present specification.
  • 20 is a diagram for describing a first physical layer.
  • 21 shows an example of a PPDU of the first type.
  • FIG. 22 shows an example of a second type of PPDU.
  • 24 is a flowchart illustrating an operation of a transmitting STA.
  • 25 is a flowchart illustrating an operation of a receiving STA.
  • 26 is a flowchart for explaining another operation of the receiving STA.
  • 27 is a flowchart illustrating another operation of the receiving STA.
  • a or B (A or B) may mean “only A”, “only B” or “both A and B”.
  • a or B (A or B)” may be interpreted as “A and/or B (A and/or B)”.
  • A, B or C (A, B or C) refers to “only A”, “only B”, “only C”, or “A, B, and any combination of C ( It can mean any combination of A, B and C)”.
  • a forward slash (/) or comma used in the present specification may mean “and/or”.
  • A/B may mean “A and/or B”. Accordingly, “A/B” may mean “only A”, “only B”, or “both A and B”.
  • A, B, C may mean “A, B or C”.
  • At least one of A and B may mean “only A”, “only B”, or “both A and B”.
  • the expression “at least one of A or B” or “at least one of A and/or B” means “at least one It can be interpreted the same as "at least one of A and B”.
  • At least one of A, B and C means “only A”, “only B”, “only C”, or “A, B and C Can mean any combination of A, B and C”.
  • at least one of A, B or C or “at least one of A, B and/or C” means It can mean “at least one of A, B and C”.
  • control information EHT-Signal
  • EHT-Signal when displayed as “control information (EHT-Signal)”, “EHT-Signal” may be proposed as an example of “control information”.
  • control information of the present specification is not limited to “EHT-Signal”, and “EHT-Signal” may be suggested as an example of “control information”.
  • EHT-signal even when displayed as “control information (ie, EHT-signal)”, “EHT-signal” may be proposed as an example of “control information”.
  • the following example of the present specification can be applied to various wireless communication systems.
  • the following example of the present specification may be applied to a wireless local area network (WLAN) system.
  • WLAN wireless local area network
  • this specification can be applied to the IEEE 802.11a/g/n/ac standard or the IEEE 802.11ax standard.
  • this specification can be applied to the newly proposed EHT standard or IEEE 802.11be standard.
  • an example of the present specification may be applied to the EHT standard or to a new wireless LAN standard that is improved (enhance) IEEE 802.11be.
  • an example of the present specification may be applied to a mobile communication system.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • an example of the present specification may be applied to a communication system of 5G NR standard based on 3GPP standard.
  • FIG. 1 shows an example of a transmitting device and/or a receiving device of the present specification.
  • the example of FIG. 1 may perform various technical features described below. 1 is related to at least one STA (station).
  • the STAs 110 and 120 of the present specification include a mobile terminal, a wireless device, a wireless transmit/receive unit (WTRU), a user equipment (UE), It may be referred to by various names such as a mobile station (MS), a mobile subscriber unit, or simply a user.
  • STAs 110 and 120 of the present specification may be referred to by various names such as a network, a base station, a Node-B, an access point (AP), a repeater, a router, and a relay.
  • the STAs 110 and 120 of the present specification may be referred to by various names such as a receiving device, a transmitting device, a receiving STA, a transmitting STA, a receiving device, and a transmitting device.
  • the STAs 110 and 120 may perform an access point (AP) role or a non-AP role. That is, the STAs 110 and 120 of the present specification may perform AP and/or non-AP functions.
  • the AP may also be indicated as an AP STA.
  • the STAs 110 and 120 of the present specification may support various communication standards other than the IEEE 802.11 standard together.
  • communication standards eg, LTE, LTE-A, 5G NR standards
  • the STA of the present specification may be implemented with various devices such as a mobile phone, a vehicle, and a personal computer.
  • the STA of the present specification may support communication for various communication services such as voice call, video call, data communication, and autonomous driving (Self-Driving, Autonomous-Driving).
  • the STAs 110 and 120 may include a medium access control (MAC) and a physical layer interface for a wireless medium according to the IEEE 802.11 standard.
  • MAC medium access control
  • the STAs 110 and 120 will be described on the basis of the sub-drawing (a) of FIG. 1 as follows.
  • the first STA 110 may include a processor 111, a memory 112, and a transceiver 113.
  • the illustrated processor, memory, and transceiver may each be implemented as separate chips, or at least two or more blocks/functions may be implemented through a single chip.
  • the transceiver 113 of the first STA performs a signal transmission/reception operation.
  • IEEE 802.11 packets eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.
  • IEEE 802.11a/b/g/n/ac/ax/be, etc. can be transmitted and received.
  • the first STA 110 may perform an intended operation of the AP.
  • the processor 111 of the AP may receive a signal through the transceiver 113, process a received signal, generate a transmission signal, and perform control for signal transmission.
  • the memory 112 of the AP may store a signal (ie, a received signal) received through the transceiver 113, and may store a signal (ie, a transmission signal) to be transmitted through the transceiver.
  • the second STA 120 may perform an intended operation of a non-AP STA.
  • the non-AP transceiver 123 performs a signal transmission/reception operation.
  • IEEE 802.11 packets eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.
  • IEEE 802.11a/b/g/n/ac/ax/be, etc. can be transmitted and received.
  • the processor 121 of the non-AP STA may receive a signal through the transceiver 123, process a received signal, generate a transmission signal, and perform control for signal transmission.
  • the memory 122 of the non-AP STA may store a signal (ie, a reception signal) received through the transceiver 123 and may store a signal (ie, a transmission signal) to be transmitted through the transceiver.
  • an operation of a device indicated as an AP may be performed by the first STA 110 or the second STA 120.
  • the operation of the device indicated as an AP is controlled by the processor 111 of the first STA 110 and is controlled by the processor 111 of the first STA 110.
  • a related signal may be transmitted or received through the controlled transceiver 113.
  • control information related to the operation of the AP or a transmission/reception signal of the AP may be stored in the memory 112 of the first STA 110.
  • the operation of the device indicated as an AP is controlled by the processor 121 of the second STA 120 and controlled by the processor 121 of the second STA 120.
  • a related signal may be transmitted or received through the transceiver 123 being used.
  • control information related to the operation of the AP or transmission/reception signals of the AP may be stored in the memory 122 of the second STA 110.
  • an operation of a device indicated as non-AP may be performed by the first STA 110 or the second STA 120.
  • the operation of the device marked as non-AP is controlled by the processor 121 of the second STA 120 and the processor of the second STA 120 ( A related signal may be transmitted or received through the transceiver 123 controlled by 121).
  • control information related to the operation of the non-AP or transmission/reception signals of the AP may be stored in the memory 122 of the second STA 120.
  • the operation of the device indicated as non-AP is controlled by the processor 111 of the first STA 110 and the processor of the first STA 120 ( A related signal may be transmitted or received through the transceiver 113 controlled by 111).
  • control information related to the operation of the non-AP or transmission/reception signals of the AP may be stored in the memory 112 of the first STA 110.
  • (transmit/receive) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmit/receive) Terminal, (transmit/receive) device , (Transmission/reception) apparatus, a device called a network, etc. may refer to the STAs 110 and 120 of FIG. 1.
  • an operation in which various STAs transmit and receive signals may be performed by the transceivers 113 and 123 of FIG. 1.
  • an operation in which various STAs generate transmission/reception signals or perform data processing or calculation in advance for transmission/reception signals may be performed by the processors 111 and 121 of FIG. 1.
  • an example of an operation of generating a transmission/reception signal or performing data processing or calculation in advance for a transmission/reception signal is: 1) Determining bit information of a subfield (SIG, STF, LTF, Data) field included in the PPDU.
  • Time resources or frequency resources eg, subcarrier resources
  • SIG, STF, LTF, Data Time resources or frequency resources
  • Determination/configuration/retrieve operation 3) A specific sequence used for the subfields (SIG, STF, LTF, Data) fields included in the PPDU (e.g., pilot sequence, STF/LTF sequence, applied to SIG)
  • An operation of determining/configuring/obtaining an extra sequence 4) a power control operation and/or a power saving operation applied to the STA, 5) an operation related to determination/acquisition/configuration/calculation/decoding/encoding of an ACK signal, etc.
  • various information used by various STAs for determination/acquisition/configuration/calculation/decoding/encoding of transmission/reception signals (for example, information related to fields/subfields/control fields/parameters/power, etc.) It may be stored in the memories 112 and 122 of FIG. 1.
  • the device/STA of the sub-drawing (a) of FIG. 1 described above may be modified as shown in the sub-drawing (b) of FIG. 1.
  • the STAs 110 and 120 of the present specification will be described based on the sub-drawing (b) of FIG. 1.
  • the transceivers 113 and 123 illustrated in sub-drawing (b) of FIG. 1 may perform the same functions as the transceiver illustrated in sub-drawing (a) of FIG. 1.
  • the processing chips 114 and 124 shown in sub-drawing (b) of FIG. 1 may include processors 111 and 121 and memories 112 and 122.
  • the processors 111 and 121 and the memories 112 and 122 illustrated in sub-drawing (b) of FIG. 1 are the processors 111 and 121 and the memories 112 and 122 illustrated in sub-drawing (a) of FIG. ) And can perform the same function.
  • Mobile Subscriber Unit user, user STA, network, base station, Node-B, AP (Access Point), repeater, router, relay, receiving device, transmitting device, receiving STA, transmitting
  • the STA, the receiving device, the transmitting device, the receiving Apparatus, and/or the transmitting Apparatus means the STAs 110 and 120 shown in sub-drawings (a)/(b) of FIG. 1, or the sub-drawing of FIG. 1 (b It may mean the processing chips 114 and 124 shown in ).
  • the technical features of the present specification may be performed on the STAs 110 and 120 shown in sub-drawings (a)/(b) of FIG. 1, and the processing chip shown in sub-drawing (b) of FIG. 114, 124).
  • the technical feature of the transmitting STA transmitting the control signal is that the control signal generated by the processors 111 and 121 shown in sub-drawings (a)/(b) of FIG. 1 is sub-drawing (a) of FIG. It can be understood as a technical feature transmitted through the transceivers 113 and 123 shown in )/(b).
  • the technical feature in which the transmitting STA transmits the control signal is a technical feature in which a control signal to be transmitted to the transceivers 113 and 123 is generated from the processing chips 114 and 124 shown in sub-drawing (b) of FIG. 1. Can be understood.
  • the technical characteristic that the receiving STA receives the control signal may be understood as a technical characteristic in which the control signal is received by the transceivers 113 and 123 shown in sub-drawing (a) of FIG. 1.
  • the technical feature that the receiving STA receives the control signal is that the control signal received by the transceivers 113 and 123 shown in sub-drawing (a) of FIG. 1 is the processor shown in sub-drawing (a) of FIG. 111, 121) can be understood as a technical feature obtained.
  • the technical feature that the receiving STA receives the control signal is that the control signal received by the transceivers 113 and 123 shown in sub-drawing (b) of FIG. 1 is a processing chip shown in sub-drawing (b) of FIG. It can be understood as a technical feature obtained by (114, 124).
  • software codes 115 and 125 may be included in the memories 112 and 122.
  • the software codes 115 and 125 may include instructions for controlling the operations of the processors 111 and 121.
  • the software codes 115 and 125 may be included in various programming languages.
  • the processors 111 and 121 or the processing chips 114 and 124 illustrated in FIG. 1 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and/or a data processing device.
  • the processor may be an application processor (AP).
  • the processors 111 and 121 or the processing chips 114 and 124 shown in FIG. 1 are a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator). and demodulator).
  • DSP digital signal processor
  • CPU central processing unit
  • GPU graphics processing unit
  • modem modulator
  • demodulator demodulator
  • SNAPDRAGONTM series processors manufactured by Qualcomm®, EXYNOSTM series processors manufactured by Samsung®, and It may be an A series processor, a HELIOTM series processor manufactured by MediaTek®, an ATOMTM series processor manufactured by INTEL®, or an enhanced processor thereof.
  • uplink may mean a link for communication from a non-AP STA to an AP STA, and an uplink PPDU/packet/signal may be transmitted through the uplink.
  • the downlink may mean a link for communication from an AP STA to a non-AP STA, and a downlink PPDU/packet/signal may be transmitted through the downlink.
  • WLAN wireless LAN
  • FIG. 2 shows the structure of an infrastructure BSS (basic service set) of IEEE (institute of electrical and electronic engineers) 802.11.
  • BSS basic service set
  • IEEE institute of electrical and electronic engineers
  • the wireless LAN system may include one or more infrastructure BSSs 200 and 205 (hereinafter, BSS).
  • BSS (200, 205) is a set of APs and STAs such as an access point (AP) 225 and STA1 (Station, 200-1) that can communicate with each other by successfully synchronizing, and does not indicate a specific area.
  • the BSS 205 may include one or more STAs 205-1 and 205-2 that can be coupled to one AP 230.
  • the BSS may include at least one STA, APs 225 and 230 providing a distribution service, and a distribution system (DS) 210 connecting a plurality of APs.
  • STA STA
  • APs 225 and 230 providing a distribution service
  • DS distribution system
  • the distributed system 210 may implement an extended service set (ESS) 240, which is an extended service set, by connecting several BSSs 200 and 205.
  • ESS 240 may be used as a term indicating one network formed by connecting one or several APs through the distributed system 210.
  • APs included in one ESS 240 may have the same service set identification (SSID).
  • the portal 220 may serve as a bridge for connecting a wireless LAN network (IEEE 802.11) and another network (eg, 802.X).
  • IEEE 802.11 IEEE 802.11
  • 802.X another network
  • a network between the APs 225 and 230 and a network between the APs 225 and 230 and the STAs 200-1, 205-1 and 205-2 may be implemented.
  • a network that performs communication by configuring a network even between STAs without the APs 225 and 230 is defined as an ad-hoc network or an independent basic service set (IBSS).
  • FIG. 2 The lower part of FIG. 2 is a conceptual diagram showing IBSS.
  • the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not include APs, there is no centralized management entity. That is, in the IBSS, the STAs 250-1, 250-2, 250-3, 255-4, and 255-5 are managed in a distributed manner. In IBSS, all STAs (250-1, 250-2, 250-3, 255-4, 255-5) can be configured as mobile STAs, and access to the distributed system is not allowed, so a self-contained network. network).
  • FIG. 3 is a diagram illustrating a general link setup process.
  • the STA may perform a network discovery operation.
  • the network discovery operation may include a scanning operation of the STA. That is, in order for the STA to access the network, it must find a network that can participate. The STA must identify a compatible network before participating in the wireless network. The process of identifying a network existing in a specific area is called scanning. Scanning methods include active scanning and passive scanning.
  • the STA performing scanning transmits a probe request frame to search for an AP present in the vicinity while moving channels and waits for a response thereto.
  • the responder transmits a probe response frame in response to the probe request frame to the STA that has transmitted the probe request frame.
  • the responder may be an STA that last transmitted a beacon frame in the BSS of the channel being scanned.
  • BSS since the AP transmits a beacon frame, the AP becomes a responder, and in IBSS, the responder is not constant because STAs in the IBSS rotate and transmit beacon frames.
  • an STA that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 stores BSS-related information included in the received probe response frame and stores the next channel (e.g., 2 Channel) and scanning (ie, probe request/response transmission/reception on channel 2) in the same manner.
  • the next channel e.g., 2 Channel
  • scanning ie, probe request/response transmission/reception on channel 2
  • the scanning operation may be performed in a passive scanning method.
  • An STA performing scanning based on passive scanning may wait for a beacon frame while moving channels.
  • the beacon frame is one of the management frames in IEEE 802.11, and is periodically transmitted so that an STA that notifies the existence of a wireless network and performs scanning can find a wireless network and participate in the wireless network.
  • the AP performs a role of periodically transmitting a beacon frame, and in IBSS, the STAs in the IBSS rotate and transmit the beacon frame.
  • the STA performing the scanning receives the beacon frame, it stores information on the BSS included in the beacon frame, moves to another channel, and records the beacon frame information in each channel.
  • the STA receiving the beacon frame may store BSS-related information included in the received beacon frame, move to the next channel, and perform scanning in the next channel in the same manner.
  • the STA discovering the network may perform an authentication process through step SS320.
  • This authentication process may be referred to as a first authentication process in order to clearly distinguish it from the security setup operation of step S340 to be described later.
  • the authentication process of S320 may include a process in which the STA transmits an authentication request frame to the AP, and in response thereto, the AP transmits an authentication response frame to the STA.
  • An authentication frame used for authentication request/response corresponds to a management frame.
  • the authentication frame consists of an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a robust security network (RSN), and a finite cycle group. Group), etc. can be included.
  • RSN robust security network
  • the STA may transmit an authentication request frame to the AP.
  • the AP may determine whether to allow authentication for the corresponding STA based on the information included in the received authentication request frame.
  • the AP may provide the result of the authentication process to the STA through the authentication response frame.
  • the STA that has been successfully authenticated may perform a connection process based on step S330.
  • the association process includes a process in which the STA transmits an association request frame to the AP, and in response thereto, the AP transmits an association response frame to the STA.
  • the connection request frame includes information related to various capabilities, beacon listening intervals, service set identifiers (SSIDs), supported rates, supported channels, RSNs, and mobility domains. , Supported operating classes, TIM broadcast request, interworking service capability, and the like may be included.
  • connection response frame includes information related to various capabilities, status codes, association IDs (AIDs), support rates, Enhanced Distributed Channel Access (EDCA) parameter sets, Received Channel Power Indicators (RCPI), Received Signal to Noise (RSNI). Indicator), mobility domain, timeout interval (association comeback time), overlapping BSS scan parameter, TIM broadcast response, QoS map, etc. may be included.
  • AIDs association IDs
  • EDCA Enhanced Distributed Channel Access
  • RCPI Received Channel Power Indicators
  • RSNI Received Signal to Noise
  • Indicator mobility domain
  • timeout interval association comeback time
  • overlapping BSS scan parameter TIM broadcast response
  • QoS map etc.
  • step S340 the STA may perform a security setup process.
  • the security setup process of step S340 may include, for example, a process of performing a private key setup through 4-way handshaking through an Extensible Authentication Protocol over LAN (EAPOL) frame. .
  • EAPOL Extensible Authentication Protocol over LAN
  • FIG. 4 is a diagram showing 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
  • the data field included user data corresponding to PSDU (MAC PDU/Aggregated MAC PDU). Included.
  • FIG. 4 also includes an example of an HE PPDU of the IEEE 802.11ax standard.
  • the HE PPDU according to FIG. 4 is an example of a PPDU for multiple users, and HE-SIG-B is included only for multiple users, and the corresponding HE-SIG-B may be omitted in the PPDU for a single user.
  • the HE-PPDU for multiple users is L-STF (legacy-short training field), L-LTF (legacy-long training field), L-SIG (legacy-signal), HE-SIG-A (high efficiency-signal A), HE-SIG-B (high efficiency-signal-B), HE-STF (high efficiency-short training field), HE-LTF (high efficiency-long training field) , A data field (or MAC payload), and a packet extension (PE) field.
  • Each field may be transmitted during the illustrated time period (ie, 4 or 8 ⁇ s, etc.).
  • the resource unit may include a plurality of subcarriers (or tones).
  • the resource unit may be used when transmitting signals to multiple STAs based on the OFDMA technique. Also, even when a signal is transmitted to one STA, a resource unit may be defined.
  • the resource unit can be used for STF, LTF, data fields, and the like.
  • FIG. 5 is a diagram showing an arrangement of resource units (RU) used in a 20 MHz band.
  • resource units corresponding to different numbers of tones (ie, subcarriers) may be used to configure some fields of the HE-PPDU.
  • resources may be allocated in units of RU shown for HE-STF, HE-LTF, and data fields.
  • 26-units ie, units corresponding to 26 tones
  • 6 tones may be used as a guard band
  • 5 tones may be used as the guard band.
  • 7 DC tones are inserted in the center band, that is, the DC band
  • 26-units corresponding to 13 tones may exist on the left and right sides of the DC band.
  • 26-units, 52-units, and 106-units may be allocated to other bands.
  • Each unit can be assigned for a receiving station, i.e. a user.
  • the RU arrangement of FIG. 5 is utilized not only in a situation for a plurality of users (MU), but also in a situation for a single user (SU).
  • MU plurality of users
  • SU single user
  • one 242-unit is used. It is possible to use and in this case 3 DC tones can be inserted.
  • RUs of various sizes that is, 26-RU, 52-RU, 106-RU, 242-RU, etc.
  • this embodiment Is not limited to the specific size of each RU (ie, the number of corresponding tones).
  • FIG. 6 is a diagram showing an arrangement of a resource unit (RU) used in a 40 MHz band.
  • RU resource unit
  • 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, and the like may also be used in the example of FIG. 6.
  • 5 DC tones can be inserted into the center frequency, 12 tones are used as guard bands in the leftmost band of the 40MHz band, and 11 tones are used in the rightmost band of the 40MHz band. It can be used as a guard band.
  • a 484-RU when used for a single user, a 484-RU may be used. Meanwhile, the fact that the specific number of RUs can be changed is the same as the example of FIG. 4.
  • RU 7 is a diagram showing the arrangement of resource units (RU) used in the 80MHz band.
  • FIG. 7 may also be used with 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. have.
  • 7 DC tones can be inserted into the center frequency, 12 tones are used as guard bands in the leftmost band of the 80MHz band, and 11 tones are used in the rightmost band of the 80MHz band. It can be used as a guard band.
  • a 26-RU using 13 tones located on the left and right of the DC band can be used.
  • a 996-RU when used for a single user, a 996-RU may be used, and in this case, 5 DC tones may be inserted.
  • the RU arrangement (ie, RU location) shown in FIGS. 5 to 7 can be applied to a new wireless LAN system (eg, EHT system) as it is.
  • a new wireless LAN system eg, EHT system
  • the RU arrangement for 80 MHz that is, the example of FIG. 7
  • the RU arrangement for the 40 MHz that is, the example of FIG. 6
  • the arrangement of the RU for 80 MHz (example of FIG. 7) may be repeated 4 times or the arrangement of the RU for 40 MHz (ie, example of FIG. 6) may be repeated 8 times have.
  • One RU of the present specification may be allocated for only one STA (eg, non-AP). Alternatively, a plurality of RUs may be allocated for one STA (eg, non-AP).
  • the RU described herein may be used for UL (Uplink) communication and DL (Downlink) communication.
  • the transmitting STA eg, AP
  • transmits the first RU eg, 26/52/106
  • a second RU eg, 26/52/106/242-RU, etc.
  • the first STA may transmit a first Trigger-based PPDU based on the first RU
  • the second STA may transmit a second Trigger-based PPDU based on the second RU.
  • the first/second Trigger-based PPDU is transmitted to the AP in the same time interval.
  • the transmitting STA (eg, AP) allocates a first RU (eg, 26/52/106/242-RU, etc.) to the first STA, and 2 STAs may be assigned a second RU (eg, 26/52/106/242-RU, etc.). That is, the transmitting STA (eg, AP) may transmit the HE-STF, HE-LTF, and Data fields for the first STA through the first RU within one MU PPDU, and the second RU through the second RU.
  • HE-STF, HE-LTF, and Data fields for 2 STAs can be transmitted.
  • HE-SIG-B Information on the arrangement of the RU may be signaled through HE-SIG-B.
  • the HE-SIG-B field 810 includes a common field 820 and a user-specific field 830.
  • the common field 820 may include information commonly applied to all users (ie, user STAs) receiving the SIG-B.
  • the user-individual field 830 may be referred to as a user-individual control field. When the SIG-B is transmitted to a plurality of users, the user-individual field 830 may be applied to only some of the plurality of users.
  • the common field 920 and the user-individual field 930 may be encoded separately.
  • the common field 920 may include RU allocation information of N*8 bits.
  • the RU allocation information may include information on the location of the RU.
  • the RU allocation information may include information on which RU (26-RU/52-RU/106-RU) is allocated in which frequency band. .
  • a maximum of 9 26-RUs may be allocated to a 20 MHz channel.
  • Table 8 when the RU allocation information of the common field 820 is set to “00000000”, nine 26-RUs may be allocated to a corresponding channel (ie, 20 MHz).
  • Table 1 when the RU allocation information of the common field 820 is set to "00000001”, seven 26-RUs and one 52-RU are arranged in a corresponding channel. That is, in the example of FIG. 5, 52-RUs may be allocated to the rightmost side and seven 26-RUs may be allocated to the left.
  • Table 1 shows only some of the RU locations that can be displayed by RU allocation information.
  • RU allocation information may include an example of Table 2 below.
  • "01000y2y1y0" relates to an example in which 106-RU is allocated to the leftmost-left side of a 20 MHz channel, and five 26-RUs are allocated to the right side.
  • a plurality of STAs eg, User-STAs
  • up to 8 STAs may be allocated to 106-RU, and the number of STAs (eg, User-STA) allocated to 106-RU is 3-bit information (y2y1y0).
  • 3-bit information (y2y1y0) is set to N
  • the number of STAs (eg, User-STAs) allocated to 106-RU based on the MU-MIMO technique may be N+1.
  • a plurality of different STAs may be allocated to a plurality of RUs.
  • a plurality of STAs may be allocated based on the MU-MIMO technique.
  • the user-individual field 830 may include a plurality of user fields.
  • the number of STAs (eg, user STAs) allocated to a specific channel may be determined based on the RU allocation information in the common field 820. For example, when the RU allocation information of the common field 820 is "00000000", one User STA may be allocated to each of nine 26-RUs (ie, a total of 9 User STAs are allocated). That is, up to 9 User STAs may be allocated to a specific channel through the OFDMA scheme. In other words, up to 9 User STAs may be allocated to a specific channel through a non-MU-MIMO scheme.
  • RU allocation when RU allocation is set to “01000y2y1y0”, a plurality of User STAs are allocated to 106-RUs disposed on the leftmost-left through the MU-MIMO scheme, and five 26-RUs disposed on the right side are allocated Five User STAs may be allocated through a non-MU-MIMO scheme. This case is embodied through an example of FIG. 9.
  • RU allocation when RU allocation is set to “01000010” as shown in FIG. 9, based on Table 2, 106-RUs are allocated to the leftmost-left side of a specific channel, and five 26-RUs are allocated to the right side. I can.
  • a total of three User STAs may be allocated to the 106-RU through the MU-MIMO scheme.
  • the user-individual field 830 of HE-SIG-B may include 8 User fields.
  • Eight User fields may be included in the order shown in FIG. 9.
  • two User fields may be implemented as one User block field.
  • the User field shown in FIGS. 8 and 9 may be configured based on two formats. That is, a User field related to the MU-MIMO technique may be configured in a first format, and a User field related to the non-MU-MIMO technique may be configured in a second format.
  • User fields 1 to 3 may be based on a first format
  • User fields 4 to 8 may be based on a second format.
  • the first format or the second format may include bit information of the same length (eg, 21 bits).
  • Each User field may have the same size (eg, 21 bits).
  • the User Field of the first format (the format of the MU-MIMO scheme) may be configured as follows.
  • the first bit (eg, B0-B10) in the user field (ie, 21 bits) is the identification information of the user STA to which the corresponding user field is allocated (eg, STA-ID, partial AID, etc.) It may include.
  • the second bit (eg, B11-B14) in the user field (ie, 21 bits) may include information on spatial configuration.
  • an example of the second bit (ie, B11-B14) may be as shown in Tables 3 to 4 below.
  • information on the number of spatial streams for a user STA may consist of 4 bits.
  • information on the number of spatial streams for a user STA ie, second bits, B11-B14
  • information on the number of spatial streams ie, second bits, B11-B14
  • the third bit (ie, B15-18) in the user field (ie, 21 bits) may include MCS (Modulation and coding scheme) information.
  • MCS information may be applied to a data field in a PPDU in which the corresponding SIG-B is included.
  • MCS MCS information
  • MCS index MCS field, and the like used in the present specification may be indicated by a specific index value.
  • MCS information may be indicated by index 0 to index 11.
  • the MCS information includes information on a constellation modulation type (e.g., BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, etc.), and a coding rate (e.g., 1/2, 2/ 3, 3/4, 5/6, etc.).
  • Information on the channel coding type eg, BCC or LDPC
  • the fourth bit (ie, B19) in the user field (ie, 21 bits) may be a reserved field.
  • the fifth bit (ie, B20) in the user field may include information on the coding type (eg, BCC or LDPC). That is, the fifth bit (ie, B20) may include information on the type of channel coding (eg, BCC or LDPC) applied to the data field in the PPDU including the corresponding SIG-B.
  • the coding type eg, BCC or LDPC
  • the fifth bit (ie, B20) may include information on the type of channel coding (eg, BCC or LDPC) applied to the data field in the PPDU including the corresponding SIG-B.
  • the above-described example relates to the User Field of the first format (the format of the MU-MIMO scheme).
  • An example of the User field of the second format (non-MU-MIMO format) is as follows.
  • the first bit (eg, B0-B10) in the User field of the second format may include identification information of the User STA.
  • the second bit (eg, B11-B13) in the user field of the second format may include information on the number of spatial streams applied to the corresponding RU.
  • the third bit (eg, B14) in the user field of the second format may include information on whether the beamforming steering matrix is applied.
  • the fourth bit (eg, B15-B18) in the User field of the second format may include MCS (Modulation and Coding Scheme) information.
  • the fifth bit (eg, B19) in the User field of the second format may include information on whether or not Dual Carrier Modulation (DCM) is applied.
  • the sixth bit (ie, B20) in the user field of the second format may include information on the coding type (eg, BCC or LDPC).
  • a transmitting STA may perform channel access through contending (ie, a backoff operation) and transmit a trigger frame 1030. That is, the transmitting STA (eg, AP) may transmit a PPDU including the trigger frame 1330.
  • a trigger-based (TB) PPDU is transmitted after a delay equal to SIFS.
  • the TB PPDUs 1041 and 1042 may be transmitted at the same time slot and may be transmitted from a plurality of STAs (eg, User STAs) in which an AID is indicated in the trigger frame 1030.
  • the ACK frame 1050 for the TB PPDU may be implemented in various forms.
  • an orthogonal frequency division multiple access (OFDMA) technique or an MU MIMO technique can be used, and an OFDMA and MU MIMO technique can be used simultaneously.
  • OFDMA orthogonal frequency division multiple access
  • the trigger frame of FIG. 11 allocates resources for uplink multiple-user transmission (MU), and may be transmitted from an AP, for example.
  • the trigger frame may be composed of a MAC frame and may be included in a PPDU.
  • Each of the fields shown in FIG. 11 may be partially omitted, and other fields may be added. Also, the length of each field may be changed differently from that shown.
  • the frame control field 1110 of FIG. 11 includes information on the version of the MAC protocol and other additional control information, and the duration field 1120 is time information for setting NAV or an identifier of the STA (for example, For example, information on AID) may be included.
  • the RA field 1130 includes address information of the receiving STA of the corresponding trigger frame, and may be omitted if necessary.
  • the TA field 1140 includes address information of an STA (eg, an AP) that transmits a corresponding trigger frame
  • a common information field 1150 is a common information applied to a receiving STA receiving a corresponding trigger frame.
  • a field indicating the length of an L-SIG field of an uplink PPDU transmitted in response to a corresponding trigger frame, or a SIG-A field of an uplink PPDU transmitted in response to a corresponding trigger frame i.e., HE-SIG-A Field
  • information on the length of the CP of the uplink PPDU transmitted in response to the trigger frame or information on the length of the LTF field may be included.
  • the individual user information field may be referred to as an “allocation field”.
  • the trigger frame of FIG. 11 may include a padding field 1170 and a frame check sequence field 1180.
  • Each of the individual user information fields 1160#1 to 1160#N shown in FIG. 11 may again include a plurality of subfields.
  • FIG. 12 shows an example of a common information field of a trigger frame. Some of the subfields of FIG. 12 may be omitted, and other subfields may be added. In addition, the length of each of the illustrated subfields may be changed.
  • the illustrated length field 1210 has the same value as the length field of the L-SIG field of the uplink PPDU transmitted in response to the corresponding trigger frame, and the length field of the L-SIG field of the uplink PPDU represents the length of the uplink PPDU.
  • the length field 1210 of the trigger frame may be used to indicate the length of the corresponding uplink PPDU.
  • the cascade indicator field 1220 indicates whether a cascade operation is performed.
  • the cascade operation means that downlink MU transmission and uplink MU transmission are performed together within the same TXOP (Transmit Opportunity). That is, after downlink MU transmission is performed, it means that uplink MU transmission is performed after a preset time (eg, SIFS).
  • TXOP Transmit Opportunity
  • a preset time eg, SIFS
  • the CS request field 1230 indicates whether to consider the state of the radio medium or the NAV in a situation in which the receiving device receiving the corresponding trigger frame transmits the corresponding uplink PPDU.
  • the HE-SIG-A information field 1240 may include information for controlling the content of the SIG-A field (ie, the HE-SIG-A field) of the uplink PPDU transmitted in response to the corresponding trigger frame.
  • the CP and LTF type field 1250 may include information on the length of the LTF and the CP length of the uplink PPDU transmitted in response to the corresponding trigger frame.
  • the trigger type field 1060 may indicate a purpose for which the corresponding trigger frame is used, for example, normal triggering, triggering for beamforming, and request for Block ACK/NACK.
  • the trigger type field 1260 of the trigger frame indicates a basic type of trigger frame for normal triggering.
  • a basic type trigger frame may be referred to as a basic trigger frame.
  • the user information field 1300 of FIG. 13 shows an example of a subfield included in a per user information field.
  • the user information field 1300 of FIG. 13 may be understood as any of the individual user information fields 1160#1 to 1160#N mentioned in FIG. 11 above. Some of the subfields included in the user information field 1300 of FIG. 13 may be omitted, and other subfields may be added. In addition, the length of each of the illustrated subfields may be changed.
  • a user identifier field 1310 of FIG. 13 indicates an identifier of an STA (ie, a receiving STA) corresponding to per user information, and an example of the identifier is an association identifier (AID) of the receiving STA. It can be all or part of the value.
  • an RU Allocation field 1320 may be included. That is, when the receiving STA identified by the user identifier field 1310 transmits the TB PPDU corresponding to the trigger frame, it transmits the TB PPDU through the RU indicated by the RU allocation field 1320.
  • the RU indicated by the RU Allocation field 1320 may be the RU shown in FIGS. 5, 6, and 7.
  • the subfield of FIG. 13 may include a coding type field 1330.
  • the coding type field 1330 may indicate the coding type of the TB PPDU. For example, when BCC coding is applied to the TB PPDU, the coding type field 1330 may be set to '1', and when LDPC coding is applied, the coding type field 1330 may be set to '0'. have.
  • the subfield of FIG. 13 may include an MCS field 1340.
  • the MCS field 1340 may indicate an MCS scheme applied to a TB PPDU. For example, when BCC coding is applied to the TB PPDU, the coding type field 1330 may be set to '1', and when LDPC coding is applied, the coding type field 1330 may be set to '0'. have.
  • the transmitting STA may allocate 6 RU resources as shown in FIG. 14 through a trigger frame.
  • the AP is a first RU resource (AID 0, RU 1), a second RU resource (AID 0, RU 2), a third RU resource (AID 0, RU 3), a fourth RU resource (AID 2045, RU 4), a fifth RU resource (AID 2045, RU 5), and a sixth RU resource (AID 3, RU 6) may be allocated.
  • Information on AID 0, AID 3, or AID 2045 may be included, for example, in the user identification field 1310 of FIG. 13.
  • Information about RU 1 to RU 6 may be included in, for example, the RU allocation field 1320 of FIG. 13.
  • the first to third RU resources of FIG. 14 may be used as UORA resources for an associated STA
  • the fourth to fifth RU resources of FIG. 14 are for un-associated STAs. It may be used as a UORA resource
  • the sixth RU resource of FIG. 14 may be used as a resource for a normal UL MU.
  • the OBO (OFDMA random access BackOff) counter of STA1 is reduced to 0, and STA1 randomly selects the second RU resources (AID 0, RU 2).
  • the OBO counter of STA2/3 is greater than 0, uplink resources are not allocated to STA2/3.
  • STA1 of FIG. 14 is an associated STA, there are a total of three eligible RA RUs for STA1 (RU 1, RU 2, RU 3), and accordingly, STA1 decreases the OBO counter by 3 so that the OBO counter is It became 0.
  • STA2 of FIG. 14 is an associated STA, there are a total of three eligible RA RUs for STA2 (RU 1, RU 2, and RU 3). Accordingly, STA2 has reduced the OBO counter by 3, but the OBO counter is 0. Is in a larger state.
  • STA3 of FIG. 14 is an un-associated STA, there are a total of two eligible RA RUs (RU 4 and RU 5) for STA3, and accordingly, STA3 has reduced the OBO counter by 2, but the OBO counter is It is in a state greater than 0.
  • 15 shows an example of a channel used/supported/defined within a 2.4 GHz band.
  • the 2.4 GHz band may be referred to by other names such as the first band (band).
  • the 2.4 GHz band may refer to a frequency region in which channels having a center frequency adjacent to 2.4 GHz (eg, channels having a center frequency located within 2.4 to 2.5 GHz) are used/supported/defined.
  • the 2.4 GHz band may contain multiple 20 MHz channels.
  • 20 MHz in the 2.4 GHz band may have multiple channel indexes (eg, index 1 to index 14).
  • a center frequency of a 20 MHz channel to which channel index 1 is assigned may be 2.412 GHz
  • a center frequency of a 20 MHz channel to which channel index 2 is assigned may be 2.417 GHz
  • 20 MHz to which channel index N is assigned The center frequency of the channel may be (2.407 + 0.005*N) GHz.
  • the channel index may be referred to by various names such as channel number. Specific values of the channel index and the center frequency may be changed.
  • Each of the illustrated first to fourth frequency regions 1510 to 1540 may include one channel.
  • the first frequency domain 1510 may include channel 1 (a 20 MHz channel having index 1).
  • the center frequency of channel 1 may be set to 2412 MHz.
  • the second frequency domain 1520 may include channel 6.
  • the center frequency of channel 6 may be set to 2437 MHz.
  • the third frequency domain 1530 may include channel 11.
  • the center frequency of channel 11 may be set to 2462 MHz.
  • the fourth frequency domain 1540 may include channel 14. At this time, the center frequency of channel 14 may be set to 2484 MHz.
  • 16 shows an example of a channel used/supported/defined within a 5 GHz band.
  • the 5 GHz band may be referred to by another name such as the second band/band.
  • the 5 GHz band may mean a frequency range in which channels having a center frequency of 5 GHz or more and less than 6 GHz (or less than 5.9 GHz) are used/supported/defined.
  • the 5 GHz band may include a plurality of channels between 4.5 GHz and 5.5 GHz. The specific values shown in FIG. 16 may be changed.
  • the plurality of channels in the 5 GHz band include UNII (Unlicensed National Information Infrastructure)-1, UNII-2, UNII-3, and ISM.
  • UNII-1 can be called UNII Low.
  • UNII-2 may include a frequency domain called UNII Mid and UNII-2 Extended.
  • UNII-3 can be called UNII-Upper.
  • a plurality of channels may be set within the 5 GHz band, and the bandwidth of each channel may be variously set to 20 MHz, 40 MHz, 80 MHz, or 160 MHz.
  • a frequency range/range of 5170 MHz to 5330 MHz in UNII-1 and UNII-2 may be divided into eight 20 MHz channels.
  • the frequency range/range from 5170 MHz to 5330 MHz can be divided into four channels through the 40 MHz frequency domain.
  • the 5170 MHz to 5330 MHz frequency domain/range can be divided into two channels through the 80 MHz frequency domain.
  • the 5170 MHz to 5330 MHz frequency domain/range may be divided into one channel through the 160 MHz frequency domain.
  • FIG. 17 shows an example of a channel used/supported/defined within a 6 GHz band.
  • the 6 GHz band may be referred to as a third band/band.
  • the 6 GHz band may mean a frequency range in which channels with a center frequency of 5.9 GHz or more are used/supported/defined. The specific values shown in FIG. 17 may be changed.
  • the 20 MHz channel of FIG. 17 may be defined from 5.940 GHz.
  • the leftmost channel of the 20 MHz channel of FIG. 17 may have an index number 1 (or a channel index, a channel number, etc.), and a center frequency of 5.945 GHz may be allocated. That is, the center frequency of the index N channel may be determined as (5.940 + 0.005*N) GHz.
  • the index (or channel number) of the 20 MHz channel of FIG. 17 is 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61, 65, 69, 73, 77, 81, 85, 89, 93, 97, 101, 105, 109, 113, 117, 121, 125, 129, 133, 137, 141, 145, 149, 153, 157, 161, It may be 165, 169, 173, 177, 181, 185, 189, 193, 197, 201, 205, 209, 213, 217, 221, 225, 229, 233.
  • the index of the 40 MHz channel in FIG. 17 is 3, 11, 19, 27, 35, 43, 51, 59, 67, 75, 83, 91, 99, 107, 115, 123, 131, 139, 147, 155, 163, 171, 179, 187, 195, 203, 211, 219, 227.
  • a 240 MHz channel or a 320 MHz channel may be additionally added.
  • the PPDU of FIG. 18 may be referred to as various names such as EHT PPDU, transmission PPDU, reception PPDU, 1st type or Nth type PPDU. In addition, it can be used in the EHT system and/or a new wireless LAN system that has improved the EHT system.
  • the subfields of FIG. 18 may be changed to various names.
  • the SIG A field may be referred to as an EHT-SIG-A field
  • an SIG B field may be referred to as an EHT-SIG-B
  • an STF field may be referred to as an EHT-STF field
  • an LTF field may be referred to as an EHT-LTF field.
  • the subcarrier spacing of the L-LTF, L-STF, L-SIG, and RL-SIG fields of FIG. 18 may be set to 312.5 kHz, and the subcarrier spacing of the STF, LTF, and Data fields may be set to 78.125 kHz. That is, the subcarrier index of the L-LTF, L-STF, L-SIG, and RL-SIG fields may be displayed in units of 312.5 kHz, and the subcarrier indexes of the STF, LTF, and Data fields may be displayed in units of 78.125 kHz.
  • the SIG A and/or SIG B fields of FIG. 18 may include additional fields (eg, SIG C or one control symbol, etc.).
  • additional fields eg, SIG C or one control symbol, etc.
  • all/some of the subcarrier spacing and all/some of the additionally defined SIG fields may be set to 312.5 kHz.
  • the subcarrier spacing for a part of the newly defined SIG field may be set to a preset value (eg, 312.5 kHz or 78.125 kHz).
  • the L-LTF and the L-STF may be the same as the conventional field.
  • the L-SIG field of FIG. 18 may include, for example, 24-bit bit information.
  • the 24-bit information may include a 4 bit Rate field, 1 bit Reserved bit, 12 bit Length field, 1 bit Parity bit, and 6 bit Tail bit.
  • the 12-bit Length field may include information on the number of octets of a Physical Service Data Unit (PSDU).
  • PSDU Physical Service Data Unit
  • the value of the 12-bit Length field may be determined based on the type of PPDU. For example, when the PPDU is a non-HT, HT, VHT PPDU or EHT PPDU, the value of the Length field may be determined as a multiple of 3.
  • the value of the Length field may be determined as “multiple of 3 + 1” or “multiple of 3 +2”.
  • the value of the Length field can be determined as a multiple of 3
  • the value of the Length field is "multiple of 3 + 1" or "multiple of 3 It can be determined as +2”.
  • the transmitting STA may apply BCC encoding based on a code rate of 1/2 to 24-bit information of the L-SIG field. Thereafter, the transmitting STA may obtain a 48-bit BCC coded bit. BPSK modulation is applied to the 48-bit coded bits, so that 48 BPSK symbols may be generated. The transmitting STA may map 48 BPSK symbols to locations excluding pilot subcarriers ⁇ subcarrier index -21, -7, +7, +21 ⁇ and DC subcarrier ⁇ subcarrier index 0 ⁇ .
  • the transmitting STA may additionally map a signal of ⁇ -1, -1, -1, 1 ⁇ to the subcarrier index ⁇ -28, -27, +27, +28 ⁇ .
  • the above signal can be used for channel estimation in the frequency domain corresponding to ⁇ -28, -27, +27, +28 ⁇ .
  • the transmitting STA may generate the RL-SIG generated in the same manner as the L-SIG.
  • BPSK modulation can be applied to RL-SIG.
  • the receiving STA may know that the received PPDU is an HE PPDU or an EHT PPDU based on the presence of the RL-SIG.
  • EHT-SIG-A or one control symbol may be inserted.
  • Symbols located after RL-SIG ie, EHT-SIG-A or one control symbol in the present specification
  • U-SIG Universal SIG
  • a symbol (eg, U-SIG) consecutive to the RL-SIG may include information of N bits, and may include information for identifying the type of EHT PPDU.
  • the U-SIG may be configured based on two symbols (eg, two consecutive OFDM symbols).
  • Each symbol (eg, OFDM symbol) for U-SIG may have a duration of 4 us.
  • Each symbol of U-SIG can be used to transmit 26 bits of information.
  • each symbol of U-SIG may be transmitted and received based on 52 data tones and 4 pilot tones.
  • A-bit information (eg, 52 un-coded bits) may be transmitted, and the first symbol of U-SIG is the first of the total A-bit information.
  • X-bit information (eg, 26 un-coded bits) is transmitted, and the second symbol of U-SIG can transmit remaining Y-bit information (eg, 26 un-coded bits) of the total A-bit information.
  • the transmitting STA may acquire 26 un-coded bits included in each U-SIG symbol.
  • the transmitting STA may generate 52 BPSK symbols allocated to each U-SIG symbol by performing BPSK modulation on the interleaved 52-coded bits.
  • One U-SIG symbol may be transmitted based on 56 tones (subcarriers) from subcarrier index -28 to subcarrier index +28, excluding DC index 0.
  • 52 BPSK symbols generated by the transmitting STA may be transmitted based on the remaining tones (subcarriers) excluding the pilot tones -21, -7, +7, and +21 tones.
  • A-bit information (e.g., 52 un-coded bits) transmitted by U-SIG is a CRC field (e.g., a 4-bit long field) and a tail field (e.g., a 6-bit long field). ) Can be included.
  • the CRC field and the tail field may be transmitted through the second symbol of U-SIG.
  • the CRC field may be generated based on 26 bits allocated to the first symbol of U-SIG and the remaining 16 bits excluding the CRC/tail field in the second symbol, and may be generated based on a conventional CRC calculation algorithm.
  • the tail field may be used to terminate trellis of a convolutional decoder, and may be set to “000000”, for example.
  • a bit information (eg, 52 un-coded bits) transmitted by U-SIG may be divided into version-independent bits and version-dependent bits.
  • the size of version-independent bits may be fixed or variable.
  • version-independent bits may be allocated only to the first symbol of U-SIG, or version-independent bits may be allocated to both the first symbol and the second symbol of U-SIG.
  • version-independent bits and version-dependent bits may be referred to by various names such as a first bit and a second bit.
  • the version-independent bits of U-SIG may include a 3-bit PHY version identifier.
  • the 3-bit PHY version identifier may include information related to the PHY version of the transmission/reception PPDU.
  • the first value of the 3-bit PHY version identifier may indicate that the transmission/reception PPDU is an EHT PPDU.
  • the transmitting STA may set a 3-bit PHY version identifier as the first value.
  • the receiving STA may determine that the received PPDU is an EHT PPDU based on the PHY version identifier having the first value.
  • the version-independent bits of U-SIG may include a 1-bit UL/DL flag field.
  • the first value of the 1-bit UL/DL flag field is related to UL communication
  • the second value of the UL/DL flag field is related to DL communication.
  • the version-independent bits of U-SIG may include information on the length of TXOP and information on the BSS color ID.
  • EHT PPDU supporting SU when the EHT PPDU is classified into various types (e.g., EHT PPDU supporting SU, EHT PPDU supporting MU, EHT PPDU related to Trigger Frame, EHT PPDU related to Extended Range transmission, etc.) , Information about the type of the EHT PPDU may be included in version-independent bits or version-dependent bits of U-SIG.
  • types e.g., EHT PPDU supporting SU, EHT PPDU supporting MU, EHT PPDU related to Trigger Frame, EHT PPDU related to Extended Range transmission, etc.
  • Information about the type of the EHT PPDU may be included in version-independent bits or version-dependent bits of U-SIG.
  • the U-SIG field is 1) a bandwidth field containing information about the bandwidth, 2) a field containing information about the MCS technique applied to SIG-B, and 3) dual subcarrier modulation in SIG-B ( An indication field containing information related to whether or not dual subcarrier modulation) is applied, 4) A field containing information about the number of symbols used for SIG-B, 5) Whether SIG-B is generated over the entire band It may include a field including information on whether or not, 6) a field including information on an LTF/STF type, and 7) information on a field indicating the length of the LTF and the length of the CP.
  • the SIG-B of FIG. 18 may include the technical features of HE-SIG-B shown in the example of FIGS. 8 to 9 as it is.
  • the STF of FIG. 18 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment.
  • the LTF of FIG. 18 may be used to estimate a channel in a MIMO environment or an OFDMA environment.
  • the STF of FIG. 18 may be set in various types.
  • the first type of STF (that is, 1x STF) may be generated based on a first type STF sequence in which non-zero coefficients are arranged at 16 subcarrier intervals.
  • the STF signal generated based on the first type STF sequence may have a period of 0.8 ⁇ s, and the 0.8 ⁇ s period signal may be repeated 5 times to become a first type STF having a length of 4 ⁇ s.
  • the second type of STF (that is, 2x STF) may be generated based on a second type STF sequence in which non-zero coefficients are arranged at 8 subcarrier intervals.
  • the STF signal generated based on the second type STF sequence may have a period of 1.6 ⁇ s, and the 1.6 ⁇ s period signal may be repeated 5 times to become a second type EHT-STF having a length of 8 ⁇ s.
  • a third type of STF ie, 4x EHT-STF
  • the STF signal generated based on the third type STF sequence may have a period of 3.2 ⁇ s, and the period signal of 3.2 ⁇ s may be repeated 5 times to become a third type EHT-STF having a length of 16 ⁇ s.
  • the EHT-LTF field may have first, second, and third types (ie, 1x, 2x, 4x LTF).
  • the first/second/third type LTF field may be generated based on an LTF sequence in which non-zero coefficients are arranged at 4/2/1 subcarrier intervals.
  • the first/second/third type LTF may have a time length of 3.2/6.4/12.8 ⁇ s.
  • GIs of various lengths eg, 0.8/1/6/3.2 ⁇ s may be applied to the first/second/third type LTF.
  • Information on the type of STF and/or LTF may be included in the SIG A field and/or the SIG B field of FIG. 18.
  • the PPDU of FIG. 18 may support various bandwidths.
  • the PPDU of FIG. 18 may have a bandwidth of 20/40/80/160/240/320 MHz.
  • some fields (eg, STF, LTF, data) of FIG. 18 may be configured based on RUs shown in FIGS. 5 to 7, and the like.
  • all fields of the PPDU of FIG. 18 may occupy the entire bandwidth.
  • some fields (eg, STF, LTF, data) of FIG. 18 are shown in FIGS. 5 to 7, etc.
  • the STF, LTF, and data fields for the first receiving STA of the PPDU may be transmitted and received through the first RU, and the STF, LTF, and data fields for the second receiving STA of the PPDU are transmitted and received through the second RU.
  • the positions of the first and second RUs may be determined based on FIGS. 5 to 7 and the like.
  • the PPDU of FIG. 18 may be determined (or identified) as an EHT PPDU based on the following method.
  • the receiving STA may determine the type of the received PPDU as the EHT PPDU based on the following items. For example, 1) the first symbol after the L-LTF signal of the received PPDU is BPSK, 2) RL-SIG where the L-SIG of the received PPDU is repeated is detected, and 3) the length of the L-SIG of the received PPDU When the result of applying “modulo 3” to the value is detected as “0”, the received PPDU may be determined as an EHT PPDU.
  • the receiving STA is the type of the EHT PPDU (e.g., SU/MU/Trigger-based/Extended Range type) based on bit information included in the symbol after RL-SIG of FIG. ) Can be detected.
  • the type of the EHT PPDU e.g., SU/MU/Trigger-based/Extended Range type
  • the receiving STA is 1) the first symbol after the L-LTF signal, which is BSPK, 2) RL-SIG that is consecutive to the L-SIG field and is the same as L-SIG, 3) the result of applying “modulo 3” is “ L-SIG including a Length field set to 0”, and 4) a received PPDU based on a 3-bit PHY version identifier (eg, a PHY version identifier having a first value) of the aforementioned U-SIG. It can be judged as an EHT PPDU.
  • a 3-bit PHY version identifier eg, a PHY version identifier having a first value
  • the receiving STA may determine the type of the received PPDU as an HE PPDU based on the following. For example, 1) the first symbol after the L-LTF signal is BPSK, 2) RL-SIG repeating L-SIG is detected, and 3) “modulo 3” is applied to the length value of L-SIG. When the result is detected as “1” or “2”, the received PPDU may be determined as an HE PPDU.
  • the receiving STA may determine the type of the received PPDU as non-HT, HT, and VHT PPDU based on the following items. For example, if 1) the first symbol after the L-LTF signal is BPSK, and 2) the L-SIG repeating RL-SIG is not detected, the received PPDU will be determined as non-HT, HT and VHT PPDU. I can. In addition, even if the receiving STA detects the repetition of RL-SIG, if the result of applying “modulo 3” to the length value of L-SIG is detected as “0”, the receiving PPDU is non-HT, HT and VHT PPDU. It can be judged as.
  • (transmit/receive/uplink/downward) signal may be a signal transmitted/received based on the PPDU of FIG. 18.
  • the PPDU of FIG. 18 may be used to transmit and receive various types of frames.
  • the PPDU of FIG. 18 may be used for a control frame.
  • An example of a control frame may include request to send (RTS), clear to send (CTS), Power Save-Poll (PS-Poll), BlockACKReq, BlockAck, NDP (Null Data Packet) announcement, and Trigger Frame.
  • the PPDU of FIG. 18 may be used for a management frame.
  • An example of a management frame may include a Beacon frame, (Re-)Association Request frame, (Re-)Association Response frame, Probe Request frame, and Probe Response frame.
  • the PPDU of FIG. 18 may be used for a data frame.
  • the PPDU of FIG. 18 may be used to simultaneously transmit at least two or more of a control frame, a management frame, and a data frame.
  • 19 shows a modified example of the transmitting device and/or the receiving device of the present specification.
  • Each of the devices/STAs of sub-drawings (a)/(b) of FIG. 1 may be modified as shown in FIG. 19.
  • the transceiver 630 of FIG. 19 may be the same as the transceivers 113 and 123 of FIG. 1.
  • the transceiver 630 of FIG. 19 may include a receiver and a transmitter.
  • the processor 610 of FIG. 19 may be the same as the processors 111 and 121 of FIG. 1. Alternatively, the processor 610 of FIG. 19 may be the same as the processing chips 114 and 124 of FIG. 1.
  • the memory 150 of FIG. 19 may be the same as the memories 112 and 122 of FIG. 1. Alternatively, the memory 150 of FIG. 19 may be a separate external memory different from the memories 112 and 122 of FIG. 1.
  • the power management module 611 manages power for the processor 610 and/or the transceiver 630.
  • the battery 612 supplies power to the power management module 611.
  • the display 613 outputs a result processed by the processor 610.
  • Keypad 614 receives input to be used by processor 610.
  • the keypad 614 may be displayed on the display 613.
  • the SIM card 615 may be an integrated circuit used to securely store an IMSI (international mobile subscriber identity) used to identify and authenticate a subscriber in a mobile phone device such as a mobile phone and a computer and a key associated therewith. .
  • IMSI international mobile subscriber identity
  • the speaker 640 may output a sound-related result processed by the processor 610.
  • the microphone 641 may receive a sound-related input to be used by the processor 610.
  • An STA capable of performing communication through a wireless optical communication band may perform communication through two physical layers.
  • the first physical layer may be a physical layer essentially configured in the optical communication STA.
  • the second physical layer may be a physical layer selectively configured in the optical communication STA.
  • the PPDU transmitted by the optical communication STA through the first physical layer may be composed of a first type of PPDU.
  • the PPDU transmitted by the optical communication STA through the second physical layer may be configured as a second type of PPDU.
  • an STA that transmits a PPDU of a first format or a second format may be referred to as a transmitting STA.
  • an STA that receives a PPDU of the first type or the second type may be referred to as a receiving STA.
  • the first physical layer may be configured as shown in FIG. 20.
  • 20 is a diagram for describing a first physical layer.
  • an additional module (or circuit) for wireless optical communication may be configured in a physical layer according to the conventional IEEE 802.11 standard.
  • the first physical layer is an IFFT (Inverse Fast Fourier Transform) module (or circuit) (2010), CP (Cyclic Prefix) module (or circuit) (2020), Up-conversion module (or circuit (circuit) )) 2030, a Real (or Re(.)) module (or circuit) 2040 or a Light Emitting Diode (LED) module (or circuit) 2050.
  • the first physical layer may additionally include an up-conversion module 2030 and/or an LED module 2050 to a conventional IEEE 802.11 physical layer.
  • the Inverse Fast Fourier Transform (IFFT) module 2010 may be a module for performing an IFFT process on data.
  • the CP module 2020 may be a module for adding a cyclic prefix to data on which IFFT has been performed.
  • the up-conversion module 2030 may be a module for changing a frequency to a positive number.
  • the Real (or Re(.)) module 2040 may be a module for removing an imaginary part and obtaining only a real part.
  • the LED module 2050 may be a module for transmitting data through an LED device.
  • the transmitting STA may perform an operation of transmitting data through the LED device through the first physical layer.
  • the receiving STA may acquire data transmitted through the LED device through the first physical layer.
  • the first physical layer may be configured based on a physical layer of the conventional IEEE 802.11 standard. Accordingly, a chipset in which the first physical layer is implemented can be produced by adding at least one module (or circuit) to the chipset according to the IEEE 802.11 standard.
  • the PPDU transmitted through the first physical layer may be composed of a first type of PPDU.
  • 21 shows an example of a PPDU of the first type.
  • the first type of PPDU (2100) may include a legacy preamble (2110), legacy PHY preamble (2120) or legacy PHY data (2130).
  • the legacy preamble 2110 may include an L-STF 2111, an L-LTF 2112 or an L-SIG 2113.
  • the legacy PHY preamble 2120 may include RL-SIG 2121, HE-SIGA 2122, HE-SIGB 2123 or HE-STF 2124.
  • the legacy PHY data 2130 may include HE-DATA 2131.
  • Legacy preamble 2110 may be configured identically in all IEEE 802.11 standard physical layers. If the IEEE 802.11ax standard is used as the baseline, the PPDU 2100 of the first type may be configured in the same manner as the PPDU structure according to the IEEE 802.11ax standard. Therefore, the PPDU 2100 of the first format is L-SIG (2121), HE-SIGA (2122), HE-SIGB (2123), HE-STF (2124) or HE-DATA (after Legacy preamble (2110) 2131) may be included.
  • the PPDU 2100 of the first type of 20 MHz bandwidth may be configured like a physical layer according to the conventional IEEE 802.11 standard. After passing through the LED module 2050, the first type of PPDU 2100 may be transmitted in the actual optical communication band.
  • the second physical layer may be optimized in consideration of the characteristics of the optical communication band. Accordingly, the performance of the second physical layer may be higher than that of the first physical layer.
  • the second physical layer cannot use the physical layer according to the existing IEEE 802.11 standard, the second physical layer needs to be additionally implemented.
  • the PPDU transmitted through the second physical layer may be composed of a second type of PPDU.
  • FIG. 22 shows an example of a second type of PPDU.
  • the second type of PPDU 2200 may include a legacy preamble 2210, an LC-optimized PHY preamble 2220, or an LC-optimized PHY data 2230.
  • the legacy preamble 2210 may include an L-STF 2211, an L-LTF 2212 or an L-SIG 2213.
  • the legacy preamble 2210 may be configured in the same manner as the PPDU of the first type for coexistence with the first physical layer.
  • a field after the legacy preamble 2210 may be configured as a field specialized for optical communication.
  • the LC-optimized PHY preamble 2220 may include an LC-STF 2221, an LC-LTF 2222, an LC-SIG 2223, or an LC-ATF 2224.
  • the LC-DATA 2231 may be configured.
  • a method for performing communication in an optical communication band may be proposed based on a first physical layer and a second physical layer according to the IEEE 802.11bb standard.
  • the optical communication STA Since two physical layers (1/2 physical layer) are defined in the IEEE 802.11bb standard (hereinafter, LC (Light Communication)), the optical communication STA must be able to distinguish between two PPDUs (1/2 type PPDU). .
  • the optical communication STA may check a PPDU corresponding to a physical layer supported by the optical communication STA among PPDUs of the 1/2 format.
  • the optical communication STA may perform an association process with the STA or AP or transmit and receive data.
  • the optical communication STA must wait for transmission to prevent collision when the PPDU is transmitted, even if the PPDU is transmitted through a physical layer that is not supported.
  • the PPDU received by the optical communication STA may be a PPDU transmitted through a physical layer not supported by the optical communication STA.
  • the optical communication STA can check the length of the PPDU, the optical communication STA can wait for the transmission time of the received PPDU. In this case, there is an effect that efficient communication is performed.
  • a legacy preamble may be used.
  • signaling (or field) for classifying a 1/2 type PPDU in the L-SIG (or L-SIG field) may be added.
  • an L-SIG (or L-SIG field) may be used to transmit control information for demodulation and decoding of a data field.
  • L-SIG can be composed of 24 bits.
  • the L-SIG may consist of a 4 bit rate field, 1 bit reserved bit, 12 bit length field, 1 bit parity bit, and 6 bit tail field. .
  • the rate field may include transmission rate information.
  • the rate field may include information on a transmission rate at which the PPDU is transmitted. However, only in the non-HT PPDU, the rate field may include information on the transmission rate at which the PPDU is transmitted.
  • the rate field may not include information on the transmission rate of the PPDUs (HT PPDU, VHT PPDU and HE PPDU). Accordingly, like the length field, the rate field may be set to a specific value.
  • the reserved bit may consist of 1 bit.
  • the reserved bit may always be set to ⁇ 0 ⁇ .
  • the length field may indicate the number of octets (or the number of bytes) of the PSDU.
  • the length field may include information on the number of octets (or the number of bytes) of the PSDU.
  • the length field may include information on the number of octets (or the number of bytes) of the PSDU.
  • the length field may be used to inform the actual transmission time of the PPDUs (HT PPDU, VHT PPDU and HE PPDU) in addition to the rate field.
  • the receiving STA that has received the length field and the rate field may check/predict a time (ie, transmission time) at which the PPDU is actually transmitted by dividing the value of the length field by the value of the rate field.
  • information about an actual rate for decoding the PPDU may be included in an additional PHY header after L-SIG.
  • the parity bit may consist of 1 bit.
  • the parity bit may be a parity bit for a rate field, a spare bit, and a length field.
  • the tail field may consist of 6 bits.
  • the tail field may always be set to ⁇ 0 ⁇ .
  • the present specification may propose a method (or an embodiment) of classifying a 1/2 type PPDU by using the L-SIG field described above. At least one of the following methods may be used.
  • the first embodiment may be applied.
  • the Length field value when the bit value of the Length field is divided by ⁇ 3 ⁇ , the Length field value may be set so that the remainder is always ⁇ 1 ⁇ or ⁇ 2 ⁇ .
  • a modulo 3 operation may be performed on the length value of the L-SIG field. If the result of performing modulo 3 operation on the length value of the L-SIG field is ⁇ 1 ⁇ or ⁇ 2 ⁇ , the STA according to the IEEE 802.11ax standard verifies that the received PPDU is a PPDU according to the 802.11ax standard. I can.
  • the 1/2 type PPDU can be classified through the above-described modulo operation.
  • the remainder in the PPDU of the first type, when the bit value of the length field of the L-SIG field (or L-SIG) is divided by ⁇ 3 ⁇ , the remainder may be set to ⁇ 1 ⁇ or ⁇ 2 ⁇ . have.
  • the remainder in the PPDU of the second format, when the bit value of the length field of the L-SIG is divided by ⁇ 3 ⁇ , the remainder may be set to ⁇ 0 ⁇ .
  • the remainder when the bit value of the length field of the L-SIG is divided by ⁇ 3 ⁇ , the remainder may be set to ⁇ 0 ⁇ .
  • the remainder when the bit value of the length field of the L-SIG is divided by ⁇ 3 ⁇ , the remainder may be set to ⁇ 1 ⁇ or ⁇ 2 ⁇ .
  • a'modulo 3'operation may be performed on the length value of the L-SIG field included in the PPDU of the first type.
  • the result of performing the'modulo 3'operation may be set to a first value (for example, ⁇ 1 ⁇ or ⁇ 2 ⁇ ).
  • a'modulo 3'operation may be performed on the length value of the L-SIG field included in the PPDU of the second type.
  • the result of performing the'modulo 3'operation may be set to a second value (eg, ⁇ 0 ⁇ ).
  • the reserved bit of L-SIG is always set to ⁇ 0 ⁇ . Accordingly, in the second embodiment, a reserved bit of L-SIG may be used to distinguish a 1/2-type PPDU. According to an embodiment, in the IEEE 802.11bb standard, when the first physical layer is used, the reserved bit of the L-SIG may be set to a first value (eg, ⁇ 0 ⁇ ). In addition, when the second physical layer is used, the reserved bit of the L-SIG may be set to a second value (eg, ⁇ 1 ⁇ ).
  • the rate field of L-SIG may be used.
  • Information included in the rate field may be set as shown in Table 5.
  • the rate field may consist of 4 bits of R1 to R4. Based on R1 to R4, information about the rate may be set. Since the rate field uses 4 bits of R1 to R4, rates in 16 cases from ⁇ 0000 ⁇ to ⁇ 1111 ⁇ may be indicated. However, as shown in Table 5, only 8 cases are used in the rate field. For example, values of ⁇ 1101 ⁇ , ⁇ 1111 ⁇ , ⁇ 0101 ⁇ , ⁇ 0111 ⁇ , ⁇ 1001 ⁇ , ⁇ 1011 ⁇ , ⁇ 0001 ⁇ , or ⁇ 0011 ⁇ may be used to indicate the actual rate. In addition, values of ⁇ 0000 ⁇ , ⁇ 0010 ⁇ , ⁇ 0100 ⁇ , ⁇ 0110 ⁇ , ⁇ 1000 ⁇ , ⁇ 1010 ⁇ , ⁇ 1100 ⁇ , ⁇ 1110 ⁇ , or ⁇ 0011 ⁇ may be set as reserved.
  • the above-described rate field may be used to distinguish a 1/2-type PPDU.
  • the format of the PPDU including the rate field may be a PPDU of the first format.
  • the PPDU including the rate field may be a PPDU transmitted through the first physical layer.
  • the format of a PPDU including the rate field may be a second format PPDU. In other words, when a reserved rate field value is used, a PPDU including the rate field may be a PPDU transmitted through the second physical layer.
  • a rate field value for the second physical layer may be newly defined.
  • a rate field for the second physical layer may be set as shown in Table 6.
  • the R4 bit (ie, the fourth bit) may be set as a first value (eg, ⁇ 1 ⁇ ).
  • the R4 bit ie, the 4th bit
  • the 1/2-type PPDU may be classified.
  • the rate field may include information on the PPDU of the first type.
  • the rate field may include information on the PPDU of the second format.
  • the rate field may be used as in the third embodiment.
  • the PPDU transmitted through the first physical layer or the second physical layer is not a non-HT PPDU. Accordingly, the values of the rate field and the length field of L-SIG may not mean the actual transmission rate or byte of PSDU. That is, the actual transmission length of the PPDU may be indicated through the rate field and the length field.
  • the ratio of the rate field and the length field is maintained, specific values of the rate field and the length field may be changed. Therefore, based on the value of the rate field, the 1/2th Physical layer may be classified. In other words, based on the value of the rate field, the 1/2 type PPDU may be classified.
  • a value of the rate field shown in Table 5 may be assigned to each of the 1/2th Physical layer. For example, if ⁇ 1101 ⁇ (6 Mbps), ⁇ 0101 ⁇ (12 Mbps), ⁇ 1001 ⁇ (24 Mbps) or ⁇ 0001 ⁇ (48 Mbps) is used, the PPDU including the rate field is the first physical layer. It may be a PPDU (that is, a first type of PPDU) transmitted through.
  • the PPDU including the rate field is It may be a PPDU transmitted through a layer (ie, a second type of PPDU).
  • a PPDU of the 1/2 format may be classified based on the value of the R3 bit, which is the 3rd bit of the rate field.
  • the PPDU including the rate field may be a PPDU of the first type.
  • the PPDU including the rate field may be a second type PPDU.
  • the 1/2-type PPDU may be classified.
  • the receiving STA may determine/confirm whether the transmitting STA that has transmitted the PPDU is configured as a first physical layer or a second physical layer based on the L-SIG.
  • 24 is a flowchart illustrating an operation of a transmitting STA.
  • a transmitting STA may determine a PHY mode.
  • the PHY mode may mean at least one of a mode using a first physical layer or a mode using a second physical layer.
  • the transmitting STA may support only the first physical layer.
  • the transmitting STA may determine a PHY mode as a mode using the first physical layer.
  • the transmitting STA may support a first physical layer and a second physical layer.
  • the transmitting STA may determine the PHY mode as one of a mode using a first physical layer and a mode using a second physical layer.
  • the transmitting STA when the transmitting STA uses the first physical layer, the transmitting STA may transmit or receive a PPDU of the first type. According to an embodiment, when the transmitting STA uses the second physical layer, the transmitting STA may transmit or receive a second type of PPDU.
  • the transmitting STA may set the L-SIG and transmit the PPDU. For example, when the transmitting STA uses the first physical layer, information indicating that the transmitted PPDU is a PPDU of the first type may be included in the L-SIG. For another example, when the transmitting STA uses the second physical layer, information indicating that the transmitted PPDU is a PPDU of the second type may be included in the L-SIG.
  • the result of performing the'modulo 3'operation on the bit value of the length field of L-SIG is a first value (for example, ⁇ 1 ⁇ or ⁇
  • the length field of L-SIG can be set to be set to 2 ⁇ ).
  • the result of performing a'modulo 3'operation on the bit value of the length field of L-SIG is a second value (eg, ⁇ 0 ⁇ )
  • the length field of the L-SIG can be set to be set to.
  • the transmitting STA may include information on the format of the PPDU transmitted by the transmitting STA in the transmitted PPDU through the first to fourth embodiments described above.
  • the transmitting STA may approve the association request of the receiving STA.
  • the receiving STA and the transmitting STA may perform communication. Therefore, when the transmitting STA transmits the PPDU of the first type, the receiving STA supporting the PPDU of the first type may make an association request to the transmitting STA. Thereafter, the transmitting STA may approve the association request of the receiving STA. Based on the association request and approval process, the transmitting STA may establish a connection between the receiving STA and the wireless optical communication band.
  • the transmitting STA may transmit and receive data with the receiving STA.
  • the transmitting STA may transmit a PPDU of the 1/2 format including data through the wireless optical communication band.
  • the transmitting STA may receive the PPDU of the 1/2 format including data through the wireless optical communication band.
  • the wireless optical communication band may include a THz band of 300 GHz or higher, a visible light band, or an infrared band.
  • 25 is a flowchart illustrating an operation of a receiving STA.
  • a receiving STA may determine a PHY mode.
  • the PHY mode may mean at least one of a mode using a first physical layer or a mode using a second physical layer.
  • the receiving STA may support only the first physical layer.
  • the receiving STA may determine the PHY mode as a mode using the first physical layer.
  • the receiving STA may support a first physical layer and a second physical layer.
  • the receiving STA may determine the PHY mode as one of a mode using a first physical layer and a mode using a second physical layer.
  • the transmitting STA may transmit or receive a PPDU of the first type.
  • the transmitting STA may transmit or receive the second type of PPDU.
  • the receiving STA may determine/confirm the PHY mode of the transmitting STA after receiving the PPDU.
  • the receiving STA may receive the PPDU from the transmitting STA.
  • the receiving STA may check the L-SIG (or L-SIG field) of the PPDU.
  • the transmitting STA may determine/confirm the PHY mode of the transmitting STA based on the L-SIG.
  • the receiving STA may perform a modulo operation on the bit value (ie, the length value) of the length field of the L-SIG of the received PPDU.
  • the receiving STA may determine/confirm the PHY mode of the transmitting STA based on the modulo operation.
  • the receiving STA may perform a'modulo 3'operation on the bit value of the length field of the L-SIG of the received PPDU.
  • the transmitting STA is the first It can be seen that the physical layer is used.
  • the transmitting STA is the second physical layer You can see that it is used.
  • the receiving STA receives the first value (for example, ⁇ 1 ⁇ or ⁇ 2 ⁇ ) based on the result of performing the'modulo 3'operation on the bit value of the length field of the L-SIG. It can be seen that one PPDU is a PPDU of the first type. In addition, based on the result of performing a'modulo 3'operation on the bit value of the length field of L-SIG is a second value (for example, ⁇ 0 ⁇ ), the received PPDU is in the second format. It can be confirmed that it is the PPDU of.
  • the first value for example, ⁇ 1 ⁇ or ⁇ 2 ⁇
  • the receiving STA may check whether the PHY mode of the receiving STA and the PHY mode of the transmitting STA match.
  • the receiving STA may request association from the transmitting STA when the PHY mode of the receiving STA and the PHY mode of the transmitting STA match. For example, when the PHY mode of the receiving STA is a mode using the first physical layer, the receiving STA may confirm that the PHY mode of the transmitting STA is a mode using the first physical layer based on the received PPDU. . Thereafter, the receiving STA may request association from the transmitting STA.
  • the receiving STA may receive approval for the association request from the transmitting STA. Based on the association request and approval process, the receiving STA may establish a connection between the transmitting STA and the wireless optical communication band.
  • the receiving STA may transmit and receive data with the transmitting STA.
  • the receiving STA may receive a PPDU of the 1/2 format including data through the wireless optical communication band.
  • the receiving STA may transmit a PPDU of the 1/2 format including data through the wireless optical communication band.
  • the wireless optical communication band may include a THz band of 300 GHz or higher, a visible light band, or an infrared band.
  • 26 is a flowchart for explaining another operation of the receiving STA.
  • a receiving STA may receive a PPDU.
  • the receiving STA may support only the first physical layer of the first physical layer and the second physical layer. Accordingly, the receiving STA may operate in a mode using the first physical layer.
  • the receiving STA may support only the second physical layer of the first physical layer and the second physical layer. Accordingly, the receiving STA may operate in a mode using the second physical layer.
  • the receiving STA may support both the first physical layer and the second physical layer.
  • the receiving STA may operate in at least one of the modes using the 1/2th physical layer.
  • the receiving STA may receive a PPDU of a first type or a PPDU of a second type from the transmitting STA.
  • the receiving STA may check whether the PHY mode of the receiving STA and the PHY mode of the transmitting STA match.
  • the receiving STA may check whether the PHY mode of the receiving STA and the PHY mode of the transmitting STA match based on the received PPDU.
  • the receiving STA may check whether the PHY mode of the receiving STA and the PHY mode of the transmitting STA match based on the L-SIG of the PPDU.
  • the receiving STA may check the PHY mode of the transmitting STA through at least one of the above-described first to fourth embodiments.
  • the receiving STA may check whether the PHY mode of the receiving STA and the PHY mode of the transmitting STA match.
  • step S2630 if the PHY mode of the receiving STA and the PHY mode of the transmitting STA match, the receiving STA may decode the PSDU. That is, the receiving STA may decode the PSDU included in the received PPDU. In other words, the receiving STA may acquire information (or data) included in the received PPDU.
  • the receiving STA may postpone channel access.
  • the receiving STA may check the transmission time of the received PPDU. For example, the receiving STA may check the transmission time (or the length of the received PPDU) of the received PPDU based on the rate field and the length field of the L-SIG. The receiving STA may postpone channel access during the transmission time of the received PPDU (or the length of the received PPDU).
  • the receiving STA may delay access to the channel by the transmission time (or the length of the PPDU) of the PPDU.
  • the receiving STA delays access to the channel, there is an effect of preventing collision with other STAs.
  • 27 is a flowchart illustrating another operation of the receiving STA.
  • the receiving STA may receive a received PPDU from the transmitting STA.
  • the receiving STA may support a PPDU of a first type of PPDU of a first type and PPDU of a second type.
  • the first type of PPDU may be generated through the first physical layer.
  • the second type of PPDU may be generated through the second physical layer.
  • the second physical layer may be distinguished from the first physical layer.
  • the receiving STA may be configured as a first physical layer among the first physical layer and the second physical layer. Accordingly, the receiving STA may decode the PPDU of the transmitting STA configured as the first physical layer.
  • the receiving STA may receive the received PPDU through a wireless optical communication band.
  • the wireless optical communication band may include a THz band of 300 GHz or higher, a visible band, or an infrared band.
  • the receiving STA may receive a signal in a wireless optical communication band through an LED module (or circuit).
  • the receiving STA may change the received signal to a PPDU of the conventional WLAN system standard. For example, the changed PPDU may be set to a bandwidth of 20 MHz.
  • the received PPDU may include a legacy preamble.
  • the legacy preamble may include L-STF (or L-STF field), L-LTF (or L-STF field), or L-SIG (or L-SIG field).
  • L-SIG may include at least one field.
  • the L-SIG may include a rate field, a length field, a reserved bit, a parity bit, or a tail field.
  • the length field may include information on a length value. That is, the L-SIG may include information on the length value.
  • the receiving STA may perform a modulo operation on the length value of the L-SIG field. For example, the receiving STA may perform a'modulo 3'operation on the length value. The receiving STA may check the result of performing the'modulo 3'operation on the length value. As an example, the receiving STA may confirm that the result of performing the'modulo 3'operation on the length value is a first value (eg, ⁇ 1 ⁇ or ⁇ 2 ⁇ ). As another example, the receiving STA may confirm that the result of performing the'modulo 3'operation on the length value is a second value (eg, ⁇ 0 ⁇ ).
  • a first value eg, ⁇ 1 ⁇ or ⁇ 2 ⁇
  • the receiving STA may confirm that the result of performing the'modulo 3'operation on the length value is a second value (eg, ⁇ 0 ⁇ ).
  • the receiving STA may determine the format of the received PPDU as a first format of a first format and a second format based on the modulo operation. For example, based on the result of performing the'modulo 3'operation on the length value being the first value (for example, ⁇ 1 ⁇ or ⁇ 2 ⁇ ), the type of the received PPDU can be determined as the first type. I can. In other words, the receiving STA may determine the type of the received PPDU as the first type based on the first value (eg, ⁇ 1 ⁇ or ⁇ 2 ⁇ ). In this case, the receiving STA may confirm that the transmitting STA has transmitted the received PPDU through the first physical layer. Since the receiving STA supports the PPDU of the first type, communication with the transmitting STA through the wireless optical communication band can be performed.
  • the type of the received PPDU may be determined as the second type.
  • the receiving STA may determine the type of the received PPDU as the second type based on the second value (eg, ⁇ 0 ⁇ ).
  • the receiving STA may confirm that the transmitting STA has transmitted the received PPDU through the second physical layer. Since the receiving STA supports the PPDU of the first type, communication with the transmitting STA through the wireless optical communication band may not be performed.
  • the receiving STA may postpone channel access during the transmission time of the received PPDU based on the second format of the received PPDU. For example, if the format of the received PPDU is in the second format, the receiving STA cannot decode the PSDU of the received PPDU, but can check the legacy preamble of the received PPDU. Accordingly, the receiving STA may check the transmission time of the received PPDU based on the rate field and the length field of the L-SIG. Thereafter, the receiving STA may postpone channel access during the transmission time of the received PPDU.
  • the receiving STA may determine the format of the received PPDU as the first format of the first format and the second format based on at least one bit of the L-SIG.
  • at least one bit may include a reserved bit of L-SIG.
  • the receiving STA may determine the type of the received PPDU as the first type of the first type and the second type. have.
  • the receiving STA may determine the type of the received PPDU as the second type of the first type and the second type. May be.
  • the receiving STA may transmit and receive data through the wireless optical communication band based on the received PPDU.
  • the receiving STA may transmit and receive data with the transmitting STA through a wireless optical communication band.
  • the receiving STA may transmit an association request to the transmitting STA based on the received PPDU. For example, the receiving STA may transmit an association request frame to the transmitting STA. Thereafter, the receiving STA may receive approval for the association request from the transmitting STA. For example, the receiving STA may receive an association response frame from the transmitting STA.
  • the receiving STA may transmit and receive data with the transmitting STA based on the association request and approval.
  • a transmitting STA may generate a transmission PPDU.
  • the transmitting STA may support the first type of PPDU from among the first type of PPDU and the second type of PPDU.
  • the first type of PPDU may be generated through the first physical layer.
  • the second type of PPDU may be generated through the second physical layer.
  • the second physical layer may be distinguished from the first physical layer.
  • the transmitting STA may be configured as a first physical layer among the first physical layer and the second physical layer. Accordingly, the PPDU generated by the transmitting STA may be a PPDU of the first type.
  • the transmission PPDU may include a legacy preamble.
  • the legacy preamble may include L-STF (or L-STF field), L-LTF (or L-STF field), or L-SIG (or L-SIG field).
  • L-SIG may include at least one field.
  • the L-SIG may include a rate field, a length field, a reserved bit, a parity bit, or a tail field.
  • the length field may include information on a length value. That is, the L-SIG may include information on the length value.
  • the length value may be set based on a modulo operation.
  • the transmitting STA may set the length value based on the format of the transmission PPDU. For example, based on the format of the transmission PPDU being the first format, the transmitting STA has a result of performing a'modulo 3'operation on the length value as a first value (for example, ⁇ 1 ⁇ , ⁇ 2 ⁇ ) You can set the length value to this.
  • the transmitting STA may transmit a transmission PPDU to the transmitting STA through the wireless optical communication band.
  • the wireless optical communication band may include a THz band of 300 GHz or higher, a visible band, or an infrared band.
  • the transmitting STA may change/convert/convert the transmission PPDU, which is a conventional wireless LAN system standard, into a signal of a wireless optical communication band through an LED module (or circuit).
  • a transmission PPDU may be set to 20 MHz.
  • the transmitting STA may transmit the signal of the wireless optical communication band to the receiving STA.
  • the transmitting STA may perform communication through a wireless optical communication band based on the transmission PPDU. Thereafter, the transmitting STA may transmit and receive data with the receiving STA through the optical communication band.
  • the technical features of the present specification described above can be applied to various devices and methods.
  • the technical features of the present specification described above may be performed/supported through the apparatus of FIGS. 1 and/or 19.
  • the technical features of the present specification described above may be applied only to a part of FIGS. 1 and/or 19.
  • the technical features of the present specification described above are implemented based on the processing chips 114 and 124 of FIG. 1, or implemented based on the processors 111 and 121 and the memories 112 and 122 of FIG. 1, , May be implemented based on the processor 610 and the memory 620 of FIG. 19.
  • the device of the present specification receives a received PPDU including an L-SIG field from a transmitting STA through a wireless optical communication band, and the device is the first of the first type PPDU and the second type PPDU.
  • a type of PPDU is supported, a modulo operation is performed on a length value of the L-SIG field, and a format of the received PPDU is selected from among the first format and the second format based on the modulo operation. It may be determined as the first format and may be configured to transmit and receive data to and from the transmitting STA through the wireless optical communication band based on the received PPDU.
  • the CRM proposed by the present specification receives a received PPDU including an L-SIG field from a transmitting STA through a wireless optical communication band, and the recording medium is a PPDU of a first format and a PPDU of a second format.
  • the recording medium is a PPDU of a first format and a PPDU of a second format.
  • At least one processor related to the CRM of the present specification may be the processors 111 and 121 or the processing chips 114 and 124 of FIG. 1, or the processor 610 of FIG. 19. Meanwhile, the CRM of the present specification may be the memories 112 and 122 of FIG. 1, the memory 620 of FIG. 19, or a separate external memory/storage medium/disk.
  • the technical features of the present specification described above can be applied to various applications or business models.
  • the above-described technical features may be applied for wireless communication in a device supporting artificial intelligence (AI).
  • AI artificial intelligence
  • Machine learning refers to the field of researching methodologies to define and solve various problems dealt with in the field of artificial intelligence. do.
  • Machine learning is also defined as an algorithm that improves the performance of a task through continuous experience.
  • An artificial neural network is a model used in machine learning, and may refer to an overall model with problem-solving capability, which is composed of artificial neurons (nodes) that form a network by combining synapses.
  • the artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process for updating model parameters, and an activation function for generating an output value.
  • the artificial neural network may include an input layer, an output layer, and optionally one or more hidden layers. Each layer includes one or more neurons, and the artificial neural network may include neurons and synapses connecting neurons. In an artificial neural network, each neuron can output a function of an activation function for input signals, weights, and biases input through synapses.
  • Model parameters refer to parameters determined through learning, and include weights of synaptic connections and biases of neurons.
  • hyperparameters refer to parameters that must be set before learning in a machine learning algorithm, and include a learning rate, iteration count, mini-batch size, and initialization function.
  • the purpose of learning artificial neural networks can be seen as determining model parameters that minimize the loss function.
  • the loss function can be used as an index to determine an optimal model parameter in the learning process of the artificial neural network.
  • Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning according to the learning method.
  • Supervised learning refers to a method of training an artificial neural network when a label for training data is given, and a label indicates the correct answer (or result value) that the artificial neural network should infer when training data is input to the artificial neural network. It can mean.
  • Unsupervised learning may refer to a method of training an artificial neural network in a state where a label for training data is not given.
  • Reinforcement learning may mean a learning method in which an agent defined in a certain environment learns to select an action or action sequence that maximizes the cumulative reward in each state.
  • machine learning implemented as a deep neural network (DNN) including a plurality of hidden layers is sometimes referred to as deep learning (deep learning), and deep learning is a part of machine learning.
  • DNN deep neural network
  • machine learning is used in the sense including deep learning.
  • a robot may refer to a machine that automatically processes or operates a task given by its own capabilities.
  • a robot having a function of recognizing the environment and performing an operation by self-determining may be referred to as an intelligent robot.
  • Robots can be classified into industrial, medical, household, military, etc. depending on the purpose or field of use.
  • the robot may be provided with a driving unit including an actuator or a motor to perform various physical operations such as moving a robot joint.
  • the movable robot includes a wheel, a brake, a propeller, and the like in the driving unit, and can travel on the ground or fly in the air through the driving unit.
  • the extended reality collectively refers to Virtual Reality (VR), Augmented Reality (AR), and Mixed Reality (MR).
  • VR technology provides only CG images of real world objects or backgrounds
  • AR technology provides virtually created CG images on top of real object images
  • MR technology is a computer that mixes and combines virtual objects in the real world. It is a graphic technology.
  • MR technology is similar to AR technology in that it shows real and virtual objects together.
  • virtual objects are used in a form that complements real objects
  • MR technology virtual objects and real objects are used with equal characteristics.
  • XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phones, tablet PCs, laptops, desktops, TVs, digital signage, etc., and devices applied with XR technology are XR devices. It can be called as.
  • HMD Head-Mount Display
  • HUD Head-Up Display
  • mobile phones tablet PCs, laptops, desktops, TVs, digital signage, etc.
  • devices applied with XR technology are XR devices. It can be called as.
  • the claims set forth herein may be combined in a variety of ways.
  • the technical features of the method claims of the present specification may be combined to be implemented as a device, and the technical features of the device claims of the present specification may be combined to be implemented by a method.
  • the technical characteristics of the method claim of the present specification and the technical characteristics of the device claim may be combined to be implemented as a device, and the technical characteristics of the method claim of the present specification and the technical characteristics of the device claim may be combined to be implemented by a method.

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

Abstract

La présente invention concerne un procédé mis en œuvre dans une STA de réception d'un système de réseau local sans fil (LAN) pouvant comprendre, selon divers modes de réalisation : une étape consistant à recevoir une unité de données de protocole physique (PPDU) de réception comprenant un champ L-SIG d'une station (STA) de transmission par l'intermédiaire d'une bande de communication optique sans fil, la STA de réception prenant en charge une PPDU d'un premier type parmi la PPDU d'un premier type et une PPDU d'un second type ; une étape consistant à effectuer une opération modulo sur la valeur de longueur du champ L-SIG ; une étape consistant à déterminer le type de PPDU de réception en tant que premier type parmi le premier type et le second type sur la base de l'opération modulo ; et une étape consistant à transmettre et à recevoir des données vers et depuis la STA de transmission par l'intermédiaire de la bande de communication optique sans fil sur la base de la PPDU de réception.
PCT/KR2020/004083 2019-03-26 2020-03-26 Procédé et dispositif destinés à réaliser une communication optique sans fil dans un système lan sans fil WO2020197272A1 (fr)

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