WO2021034155A1 - Duplication de données pour émission fiable - Google Patents

Duplication de données pour émission fiable Download PDF

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Publication number
WO2021034155A1
WO2021034155A1 PCT/KR2020/011211 KR2020011211W WO2021034155A1 WO 2021034155 A1 WO2021034155 A1 WO 2021034155A1 KR 2020011211 W KR2020011211 W KR 2020011211W WO 2021034155 A1 WO2021034155 A1 WO 2021034155A1
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Prior art keywords
ppdu
sta
psdu
field
data
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English (en)
Korean (ko)
Inventor
김정기
박은성
최진수
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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 method for copying and transmitting data in a wireless local area network (LAN) system.
  • LAN wireless local area network
  • 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 an extreme high throughput (EHT) standard that is currently being discussed.
  • the EHT standard may use a newly proposed increased bandwidth, an improved PHY layer protocol data unit (PPDU) structure, an improved sequence, and a hybrid automatic repeat request (HARQ) technique.
  • PPDU PHY layer protocol data unit
  • HARQ hybrid automatic repeat request
  • the EHT standard can be referred to as the IEEE 802.11be standard.
  • a transmitting station may generate a physical protocol data unit (PPDU) including a first data field and a second data field. .
  • the second data field may be created by duplicating the first data field.
  • the PPDU may include a preamble and a training field.
  • the transmitting STA may transmit the PPDU to the receiving STA through a transport channel.
  • the bandwidth of each of the first and second data fields may be half of the bandwidth of the transmission channel.
  • the STA may transmit a PPDU including a second data field obtained by replicating the first data field.
  • the receiving STA may more reliably receive data through frequency diversity gain. Also, since the receiving STA knows that the first data field and the second data field are the same data, it can combine the data received in each RU and can receive the frame more reliably.
  • 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.
  • Chase combining is a method in which the same coded bit as the initial transmission is retransmitted.
  • FIG. 21 is a diagram showing an example of an incremental redundancy (IR) method.
  • FIG. 23 is a diagram illustrating the relationship between PPDU, PHY Service Date Unit (PSDU), and MAC PDU (MPDU) used in this document.
  • PSDU PHY Service Date Unit
  • MPDU MAC PDU
  • 24 is a diagram illustrating an embodiment of the SIG 530 field.
  • 25 shows an example of a MAC header.
  • 26 illustrates operations in each layer of the wireless LAN system.
  • 27 is a diagram illustrating an embodiment of a method of allocating only one RU to one STA.
  • 28 is a diagram illustrating an embodiment of a method of allocating multiple RUs.
  • 29 is a diagram illustrating an embodiment of a method for transmitting a PSDU through multiple RUs.
  • FIG. 30 is a diagram illustrating an embodiment of a method of transmitting a PSDU through multiple RUs.
  • 31A and 31B are diagrams illustrating an embodiment of a transport block structure of a transmitting STA.
  • FIG. 32 is a diagram illustrating an embodiment of a method for dividing a PSDU.
  • 33A and 33B are diagrams illustrating an embodiment of a transport block structure of a transmitting STA.
  • 34 is a diagram illustrating an embodiment of a transport block structure of a transmitting STA.
  • 35 is a diagram illustrating an embodiment of a method for transmitting a PSDU through multiple RUs.
  • FIG. 36 is a diagram illustrating an embodiment of a method for transmitting a PSDU through multiple RUs.
  • 37 is a diagram illustrating an embodiment of a method of transmitting HARQ data through multiple RUs.
  • 38 is a diagram illustrating an embodiment of a method of transmitting HARQ data through multiple RUs.
  • 39 is a diagram illustrating an embodiment of a method of transmitting a PSDU through multiple RUs.
  • 40 is a diagram illustrating an embodiment of a method of transmitting a PSDU through multiple RUs.
  • 41 is a diagram illustrating an embodiment of a transmitting STA operation.
  • FIG. 42 is a diagram illustrating an embodiment of operation of a 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)' means'only A','only B','only C', or any and all combinations of'A, B and 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'.
  • '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 (at least one of A or B)' or'at least one of A and/or B (at least one of A and/or B)' in the present specification is'at least one A and B (at least one of A and B)' can be interpreted the same.
  • 'at least one of A, B and C (at least one of A, B and C)' means'only A','only B','only C', or'A, B and C It may mean any combination of A, B and C'.
  • 'at least one of A, B or C (at least one of A, B or C)' or'at least one of A, B and/or C (at least one of A, B and/or C)' It may mean'at least one of A, B and C'.
  • parentheses used in the present specification may mean'for example'.
  • eHT-Signal EHT-Signal
  • 'EHT-Signal' may be proposed as an example of'control information'.
  • 'control information' in the present specification is not limited to'EHT-Signal', and'EHT-Signal' may be suggested as an example of'control information'.
  • EHT-signal EHT-signal
  • EHT-signal EHT-signal
  • 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 a new wireless LAN standard that is enhanced with 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 also 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 by the 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, an apparatus called a network, etc. may mean the STAs 110 and 120 of FIG. 1.
  • STAs 110 and 120 of FIG. 1 may also mean 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) Determine the bit information of the subfields (SIG, STF, LTF, Data) fields included in the PPDU /Acquisition/configuration/computation/decoding/encoding operations, 2) Time resources or frequency resources (eg, subcarrier resources) used for subfields (SIG, STF, LTF, Data) included in the PPDU, etc.
  • 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. Can include.
  • 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 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, because STAs in the IBSS rotate and transmit beacon frames, the responder is not constant.
  • 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 (that is, probe request/response transmission/reception on channel 2) in the same manner.
  • the next channel e.g., 2 Channel
  • scanning that is, 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 that discovers the network may perform an authentication process through step S320.
  • 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, five DC tones may be inserted.
  • 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 820 and the user-individual field 830 may be encoded separately.
  • the common field 820 may include N*8 bits of RU allocation information.
  • the RU allocation information may include information on the location of the RU. For example, when a 20 MHz channel is used as shown in FIG. 5, 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 1 when the RU allocation information of the common field 820 is set as '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 as '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 side.
  • 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
  • a plurality of STAs may be allocated to the 106-RU based on the MU-MIMO technique.
  • up to 8 STAs eg, User-STA
  • 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 technique. 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 technique, 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 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.
  • the second bit may include information on the number of Spatial Streams allocated to a plurality of User STAs allocated according to the MU-MIMO scheme. have. For example, when three User STAs are allocated to 106-RU based on the MU-MIMO technique as shown in FIG. 9, N_user is set to '3', and accordingly, N_STS[1], as shown in Table 3, Values of N_STS[2] and N_STS[3] may be determined.
  • 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, the second bit, 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.).
  • a 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 includes 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 about a length of a CP of an uplink PPDU transmitted in response to a corresponding trigger frame or information about a length of an LTF field may be included.
  • the individual user information field may be referred to as an'assignment 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 in the same TXOP. That is, after downlink MU transmission is performed, it means that uplink MU transmission is performed after a preset time (eg, SIFS).
  • 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 region 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.
  • 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.
  • the PPDU or EHT PPDU may be referred to as various names such as a transmission PPDU, a reception PPDU, a first type or an N type PPDU.
  • the EHT PPU can be used in the EHT system and/or in a new wireless LAN system with an improved EHT system.
  • the PPDU of FIG. 18 may represent some or all of the PPDU types used in the EHT system.
  • the example of FIG. 18 may be used for both a single-user (SU) mode and a multi-user (MU) mode, only the SU mode, or only the MU mode.
  • a trigger-based PPDU (TB) may be defined separately or may be configured based on the example of FIG. 18.
  • the trigger frame described through at least one of FIGS. 10 to 14 and the UL-MU operation initiated by the trigger frame (eg, transmission operation of a TB PPDU) may be applied to the EHT system as it is.
  • L-STF to EHT-LTF may be referred to as a preamble or a physical preamble, and may be generated/transmitted/received/acquired/decoded in the physical layer.
  • the subcarrier spacing of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields of FIG. 18 is set to 312.5 kHz, and the subcarrier spacing of the EHT-STF, EHT-LTF, and Data fields Can be set to 78.125 kHz. That is, the tone index (or subcarrier index) of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields is displayed in units of 312.5 kHz, EHT-STF, EHT-LTF, The tone index (or subcarrier index) of the data field may be displayed in units of 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 length or time duration of the PPDU.
  • 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.
  • a 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.
  • U-SIG Universal SIG
  • the U-SIG may be referred to by various names such as a first SIG field, a first SIG, a first type SIG, a control signal, a control signal field, and a first (type) control signal.
  • the U-SIG may include N bits of information 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.
  • U-SIG (or U-SIG field)
  • 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 the 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 control bit and a second control 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 on the type of the EHT PPDU may be included in 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 on the type of the EHT PPDU may be included in version-dependent bits of U-SIG.
  • the U-SIG includes 1) a bandwidth field including information on the bandwidth, 2) a field including information on the MCS technique applied to the EHT-SIG, and 3) dual subcarrier modulation in the EHT-SIG.
  • DCM subcarrier modulation
  • Preamble puncturing may be applied to the PPDU of FIG. 18.
  • Preamble puncturing refers to applying puncturing to some bands (eg, Secondary 20 MHz band) among the entire bands of the PPDU. For example, when an 80 MHz PPDU is transmitted, the STA may apply puncture to the secondary 20 MHz band of the 80 MHz band, and transmit the PPDU only through the primary 20 MHz band and the secondary 40 MHz band.
  • the pattern of preamble puncturing may be set in advance. For example, when the first puncturing pattern is applied, puncturing may be applied only to a secondary 20 MHz band within an 80 MHz band. For example, when the second puncturing pattern is applied, puncturing may be applied to only one of two secondary 20 MHz bands included in the secondary 40 MHz band within the 80 MHz band. For example, when the third puncturing pattern is applied, puncturing may be applied only to the secondary 20 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band).
  • the primary 40 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band) is present and does not belong to the primary 40 MHz band. Puncturing may be applied to at least one 20 MHz channel that does not exist.
  • Information on preamble puncturing applied to the PPDU may be included in U-SIG and/or EHT-SIG.
  • a first field of U-SIG may contain information on a contiguous bandwidth of a PPDU
  • a second field of U-SIG may contain information on preamble puncturing applied to a PPDU. have.
  • U-SIG and EHT-SIG may include information on preamble puncturing based on the following method.
  • the U-SIG can be individually configured in units of 80 MHz.
  • the PPDU may include a first U-SIG for a first 80 MHz band and a second U-SIG for a second 80 MHz band.
  • the first field of the first U-SIG includes information on the 160 MHz bandwidth
  • the second field of the first U-SIG is information on preamble puncturing applied to the first 80 MHz band (i.e., preamble Information about puncturing patterns) may be included.
  • the first field of the second U-SIG includes information on a 160 MHz bandwidth
  • the second field of the second U-SIG is information on preamble puncturing applied to the second 80 MHz band (ie, preamble puncturing).
  • Information on the processing pattern may be included.
  • the EHT-SIG continuing to the first U-SIG may include information on preamble puncturing applied to the second 80 MHz band (ie, information on preamble puncturing pattern)
  • the second U-SIG Consecutive EHT-SIG may include information on preamble puncturing applied to the first 80 MHz band (ie, information on preamble puncturing pattern).
  • U-SIG and EHT-SIG may include information on preamble puncturing based on the following method.
  • the U-SIG may include information on preamble puncturing for all bands (that is, information on preamble puncturing pattern). That is, the EHT-SIG does not include information on preamble puncturing, and only U-SIG may include information on preamble puncturing (ie, information on preamble puncturing pattern).
  • U-SIG can be configured in units of 20 MHz. For example, when an 80 MHz PPDU is configured, U-SIG can be duplicated. That is, the same four U-SIGs may be included in the 80 MHz PPDU. PPDUs exceeding the 80 MHz bandwidth may contain different U-SIGs.
  • the EHT-SIG 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 EHT-SIG may be referred to by various names such as a second SIG field, a second SIG, a second type SIG, a control signal, a control signal field, and a second (type) control signal.
  • the EHT-SIG may include N-bit information (eg, 1-bit information) regarding whether the EHT-PPDU supports the SU mode or the MU mode.
  • N-bit information eg, 1-bit information
  • EHT-SIG can be configured based on various MCS techniques. As described above, information related to the MCS technique applied to the EHT-SIG may be included in the U-SIG.
  • the EHT-SIG can be configured based on the DCM technique. For example, of the N data tones (e.g., 52 data tones) allocated for EHT-SIG, the first modulation technique is applied to half of the continuous tones, and the second modulation is applied to the remaining half of the tones. The technique can be applied.
  • the transmitting STA modulates specific control information with a first symbol based on the first modulation technique and allocates it to a continuous half tone, modulates the same control information with a second symbol based on the second modulation technique, and It can be assigned to half of the tone.
  • information related to whether the DCM technique is applied to the EHT-SIG may be included in the U-SIG.
  • the EHT-STF of FIG. 18 is a multiple input multiple output (MIMO) environment or It can be used to improve automatic gain control estimation in an OFDMA environment.
  • the EHT-LTF of FIG. 18 may be used to estimate a channel in a MIMO environment or an OFDMA environment.
  • the EHT-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.
  • an example of a sequence ie, an EHT-STF sequence
  • the following sequence can be modified in various ways.
  • the EHT-STF may be configured based on the following M sequence.
  • M ⁇ -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1 ⁇
  • EHT-STF for 20 MHz PPDU may be configured based on the following equation.
  • the following example may be a first type (ie, 1x STF) sequence.
  • the first type sequence may be included in an EHT-PPDU other than a trigger-based (TB) PPDU.
  • (a:b:c) may mean a section defined as a b tone interval (ie, subcarrier interval) from a tone index (ie, subcarrier index) to c tone index.
  • Equation 2 below may represent a sequence defined by 16 tone intervals from the tone index -112 to the 112 index.
  • EHT-STF(-112:16:112) ⁇ M ⁇ *(1 + j)/sqrt(2)
  • EHT-STF for 40 MHz PPDU may be configured based on the following equation.
  • the following example may be a first type (ie, 1x STF) sequence.
  • EHT-STF(-240:16:240) ⁇ M, 0, -M ⁇ *(1 + j)/sqrt(2)
  • EHT-STF for the 80 MHz PPDU may be configured based on the following equation.
  • the following example may be a first type (ie, 1x STF) sequence.
  • EHT-STF(-496:16:496) (M, 1, -M, 0, -M, 1, -M ⁇ *(1 + j)/sqrt(2)
  • the EHT-STF for 160 MHz PPDU may be configured based on the following equation.
  • the following example may be a first type (ie, 1x STF) sequence.
  • EHT-STF(-1008:16:1008) (M, 1, -M, 0, -M, 1, -M, 0, -M, -1, M, 0, -M, 1, -M ⁇ *(1 + j)/sqrt(2)
  • the sequence for the lower 80 MHz of the EHT-STF for the 80+80 MHz PPDU may be the same as in Equation 4.
  • a sequence for an upper 80 MHz among EHT-STFs for an 80+80 MHz PPDU may be configured based on the following equation.
  • EHT-STF(-496:16:496) ⁇ -M, -1, M, 0, -M, 1, -M ⁇ *(1 + j)/sqrt(2)
  • Equations 7 to 11 below relate to an example of a second type (ie, 2x STF) sequence.
  • EHT-STF(-120:8:120) (M, 0, -M ⁇ *(1 + j)/sqrt(2)
  • EHT-STF for 40 MHz PPDU may be configured based on the following equation.
  • EHT-STF(-248:8:248) (M, -1, -M, 0, M, -1, M ⁇ *(1 + j)/sqrt(2)
  • EHT-STF for the 80 MHz PPDU may be configured based on the following equation.
  • EHT-STF(-504:8:504) (M, -1, M, -1, -M, -1, M, 0, -M, 1, M, 1, -M, 1, -M ⁇ *(1 + j)/sqrt(2)
  • the EHT-STF for 160 MHz PPDU may be configured based on the following equation.
  • EHT-STF(-1016:16:1016) (M, -1, M, -1, -M, -1, M, 0, -M, 1, M, 1, -M, 1, -M, 0, -M, 1, -M, 1, M, 1, -M, 0, -M, 1, M, 1, -M, 1, -M ⁇ *(1 + j)/sqrt(2)
  • the sequence for the lower 80 MHz of the EHT-STF for the 80+80 MHz PPDU may be the same as in Equation 9.
  • a sequence for an upper 80 MHz among EHT-STFs for an 80+80 MHz PPDU may be configured based on the following equation.
  • EHT-STF(-504:8:504) ⁇ -M, 1, -M, 1, M, 1, -M, 0, -M, 1, M, 1, -M, 1, -M ⁇ * (1 + j)/sqrt(2)
  • the EHT-LTF may have first, second, and third types (ie, 1x, 2x, 4x LTF).
  • the first/second/third type LTF 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 (ie, EHT-PPDU) may be configured based on the examples of FIGS. 5 and 6.
  • an EHT PPDU transmitted on a 20 MHz band may be configured based on the RU of FIG. 5. That is, the location of the EHT-STF, EHT-LTF, and RU of the data field included in the EHT PPDU may be determined as shown in FIG. 5.
  • the EHT PPDU transmitted on the 40 MHz band may be configured based on the RU of FIG. 6. That is, the location of the EHT-STF, EHT-LTF, and RU of the data field included in the EHT PPDU may be determined as shown in FIG. 6.
  • a tone-plan for 80 MHz may be determined. That is, the 80 MHz EHT PPDU may be transmitted based on a new tone-plan in which the RU of FIG. 6 is repeated twice, not the RU of FIG. 7.
  • 23 tones may be configured in the DC region. That is, a tone-plan for an 80 MHz EHT PPDU allocated based on OFDMA may have 23 DC tones.
  • the 80 MHz EHT PPDU i.e., non-OFDMA full bandwidth 80 MHz PPDU
  • Non-OFDMA is configured based on 996 RU and consists of 5 DC tones, 12 left guard tones, and 11 right guard tones. It may include.
  • the tone-plan for 160/240/320 MHz may be configured in a form of repeating the pattern of FIG. 6 several times.
  • 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 of the field 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 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 the 3-bit PHY version identifier (eg, PHY version identifier having a first value) of the above-described U-SIG. It can be judged as an EHT PPDU.
  • the 3-bit PHY version identifier eg, 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. 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 received 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.
  • the STA described below may be the device of FIG. 1 and/or FIG. 19, and the PPDU may be the PPDU of FIG. 18.
  • the STA may be an AP or a non-AP STA.
  • An STA (eg, an AP or a non-AP STA) described below may be an STA supporting multi-link (eg, an AP multi-link device (MLD) or a non-AP STA MLD).
  • MLD AP multi-link device
  • MLD non-AP STA MLD
  • Hybrid automatic repeat request is a method of using a forward error correcting (FEC) technique and an automatic error request (ARQ) technique together. Unlike a general automatic repeat request (ARQ), HARQ may additionally transmit information related to an FEC code capable of detecting an error. The receiving terminal may attempt error recovery through the FEC code, and if error recovery fails, it may request retransmission to the transmitting terminal through ARQ.
  • HARQ is used in standards such as high-speed downlink packet access (HSDPA), IEEE802.16e, and long term evolution (LTE), but HARQ has not been used in a contention-based wireless local area network (WLAN) environment. .
  • the receiving terminal may perform decoding by combining the previously received original frame and the retransmitted frame.
  • the unit for retransmission may be performed in units of codewords at the PHY level, or HARQ retransmissions may be performed in units of MPDUs at the MAC level.
  • the terminal described below may be the device of FIG. 1 and/or FIG. 19, and the PPDU may be the PPDU of FIG. 18.
  • the terminal may be an AP or a non-AP STA.
  • the HARQ technique is a technique that combines a forward error correction (FEC) scheme and an automatic repeat request (ARQ) scheme. According to the HARQ scheme, it is checked whether the data received by the physical layer contains an error that cannot be decoded, and if an error occurs, performance is improved by requesting retransmission.
  • FEC forward error correction
  • ARQ automatic repeat request
  • the HARQ-based receiver basically attempts error correction for received data and determines whether to retransmit using an error detection code.
  • the error detection code may be various codes. For example, in the case of using a cyclic redundancy check (CRC), when an error of received data is detected through a CRC detection process, the receiver transmits a non-acknowledgement (NACK) signal to the transmitter. Upon receiving the NACK signal, the transmitter transmits appropriate retransmission data according to the HARQ mode.
  • CRC cyclic redundancy check
  • NACK non-acknowledgement
  • a receiver receiving retransmission data improves reception performance by combining and decoding previous data and retransmission data.
  • the HARQ mode can be classified into Chase combining and IR (incremental redundancy).
  • Chase combining is a method of obtaining a signal-to-noise ratio (SNR) gain by combining data with retransmitted data without discarding the error-detected data.
  • IR is a method of obtaining a coding gain by incrementally transmitting additional redundant information to retransmitted data.
  • Chase combining is a method in which the same coded bit as the initial transmission is retransmitted.
  • FIG. 21 is a diagram showing an example of an incremental redundancy (IR) method.
  • IR incremental redundancy
  • the coded bits that are initially transmitted and retransmitted afterwards may be different as follows. Accordingly, when the IR scheme is used, the STA performing retransmission generally transmits the IR version (or packet version/retransmission version) to the receiving STA.
  • the transmitting STA performs retransmission in the order of IR version 1, IR Version 2, IR Version 3, and IR Version 1.
  • the receiving STA may combine and decode the received packet/signal.
  • HARQ can have an effect of increasing coverage in a low SNR environment (eg, an environment in which the distance between the transmitting terminal and the receiving terminal is far).
  • HARQ can have an effect of increasing throughput in a high SNR environment.
  • FIG. 23 is a diagram illustrating the relationship between PPDU, PHY Service Date Unit (PSDU), and MAC PDU (MPDU) used in this document.
  • PSDU PHY Service Date Unit
  • MPDU MAC PDU
  • the example of FIG. 23 may be variously changed according to the wireless LAN standard. For example, various PHY preamble/midamble may be added between the SIG (Signal) field and the data field of FIG. 23. Also, the specific numerical value (eg, the number of bits) displayed in FIG. 23 may be changed.
  • the initial portion of the PPDU used in the present specification may include a short training field (STF) field according to the conventional legacy standard. That is, the STF 510 may be a conventional L-STF.
  • STF short training field
  • the STF 510 may be used for frame detection, automatic gain control (AGC), diversity detection, coarse frequency/time synchronization, and the like.
  • AGC automatic gain control
  • the initial portion of the PPDU used in this specification may include a long training field (LTF) field according to a conventional legacy standard. That is, the LTF 520 may be a conventional L-LTF.
  • LTF long training field
  • the LTF 520 may include a long training orthogonal frequency division multiplexing symbol (OFDM).
  • OFDM orthogonal frequency division multiplexing symbol
  • the LTF 520 may be used for fine frequency/time synchronization and channel prediction.
  • the initial portion of the PPDU used in this specification may include a SIG (signal) field according to the conventional legacy standard. That is, the SIG 530 may be a conventional L-SIG.
  • the SIG 530 field may include 24-bit information as shown in FIG. 24 below.
  • the Rate field of the SIG 530 field may be composed of 4 bits, and may include information on a rate defined in units of Mb/s.
  • the R field of the SIG 530 field is composed of 1 bit and may be a reserved bit, and may be modified for various purposes.
  • the Length field of the SIG 530 field may include information on the number of octets of a Physical Service Data Unit (PSDU) transmitted from the PHY layer.
  • PSDU Physical Service Data Unit
  • the Parity bit of the SIG 530 field may be used for even parity of 0 to 16 bits of the SIG 530.
  • the Tail bit of the SIG 530 field is composed of 6 bits and may be set to 0.
  • the MAC layer of the transmitting STA may request transmission of the MPDU to the PHY layer.
  • a header ie, a PHY header
  • a tail bit and/or a padding bit may be included in the rear part of the PSDU.
  • scrambling and coding may be applied to the PSDU.
  • the PHY Header and PSDU of FIG. 23 are converted into the SIG field and the data field of FIG. 22.
  • the data field 540 illustrated in FIG. 22 may include a SERVICE field 541, a physical layer service data unit (PSDU) 542, a PPDU TAIL bit 543, and a padding bit 544.
  • Some bits of the SERVICE field 541 may be used for synchronization of the descrambler at the receiving end.
  • the PSDU 542 corresponds to a MAC Protocol Data Unit (MPDU) defined in the MAC layer, and may include data generated/used in an upper layer.
  • the PPDU TAIL bit 543 can be used to return the encoder to the 0 state.
  • the padding bit 544 may be used to adjust the length of the data field in a predetermined unit.
  • MPDU may include at least one MSDU.
  • the MPDU may include a MAC header and a trailer.
  • the structure of the MAC header may be as follows.
  • FIG. 25 shows an example of a MAC header.
  • the specific field of the MAC header may be changed.
  • the MPDU is defined according to various MAC frame formats, and a basic MAC frame is composed of a MAC header, a frame body, and a frame check sequence (FCS).
  • the MAC frame is composed of MPDU and can be transmitted/received through the PSDU of the data part of the PPDU frame format.
  • the MAC header includes a frame control field, a duration/ID field, an address field, and the like.
  • the frame control field may include control information necessary for frame transmission/reception.
  • the period/ID field may be set as a time for transmitting a corresponding frame or the like.
  • the period/ID field included in the MAC header may be set to a 16-bit length (e.b., B0 to B15).
  • the content included in the period/ID field may vary depending on the frame type and subtype, whether it is transmitted during a contention free period (CFP), or the QoS capability of the transmitting STA.
  • the period/ID field may include the AID of the transmitting STA (e.g., through 14 LSB bits), and 2 MSB bits may be set to 1.
  • the period/ID field may be set to a fixed value (e.g., 32768).
  • the period/ID field may include a duration value defined for each frame type.
  • the period/ID field may include a duration value defined for each frame type. For example, when B15 of the period/ID field is set to 0, it indicates that the period/ID field is used to indicate the TXOP Duration, and B0 to B14 may be used to indicate the actual TXOP Duration.
  • the frame control field of the MAC header may include Protocol Version, Type, Subtype, To DS, From DS, More Fragment, Retry, Power Management, More Data, Protected Frame, Order subfields. have.
  • the transmitting STA and the receiving STA include Layer 2 (ie, the MAC layer) and Layer 1 (ie, the PHY layer), and may generate MPDUs and PPDUs described in FIGS. P1 to 25. That is, the transmitting STA may generate an MPDU including an MSDU and a MAC header. In addition, the transmitting STA may generate a PPDU by adding a PSDU and a PHY preamble/header corresponding to the generated MPDU.
  • the receiving STA removes the PHY preamble/header, etc. from the received PPDU, obtains the PSDU, obtains the MPDU corresponding to the PSDU, removes the MAC header, etc. in the MPDU to obtain the MSDU, and transfers the obtained MSDU to the upper layer. Can deliver.
  • one RU (resource unit) can be allocated to one STA, and DL data is transmitted through one allocated RU. Can be transmitted.
  • the AP may allocate one RU to one STA for UL OFDMA data transmission, and may receive UL data through the allocated RU.
  • the STA may stop decoding/parsing the remaining scheduling information.
  • the AP can allocate only one resource unit (RU) to one STA, and the AP can transmit and receive data with the STA through one RU allocated to the STA.
  • This is a method that can reduce the complexity of the terminal, but can reduce the effectiveness of resource use. 27 shows an example of this.
  • 27 is a diagram illustrating an embodiment of a method of allocating only one RU to one STA.
  • STA1 has subchannels corresponding to RU (resource unit) 1 and RU 4 available (eg, a CCA result is idle), and STA 2 is a subchannel corresponding to RU 2 and RU 3
  • the AP may allocate resources to STA 1 only to one of RU 1 or RU 4, and may allocate only one of RU 2 and RU 3 to STA2. That is, even if there are multiple RUs available to the STA, the AP may allocate only one RU to one STA.
  • the AP since the AP cannot allocate RU 2 and RU 3 to STA 2 at the same time, the AP may allocate only one of RU 2 and RU 3 to STA 2. In this case, if DL/UL data exists only for STA 1 and STA2, one of RU 1 or RU 4 and one of RU 2 and RU 3 cannot be used, resulting in resource waste.
  • the AP can allocate RU 1 and RU 4 to STA1, and can transmit and receive data through RU 1 and RU 4.
  • the AP may allocate RU 2 and RU 3 to STA2, and transmit and receive data through RU 2 and RU 3.
  • 28 is a diagram illustrating an embodiment of a method of allocating multiple RUs.
  • STA1 may be assigned RU 1 and RU 4
  • STA2 may be assigned RU 2 and RU 3.
  • the AP may transmit and receive data through STA1 and RU 1 and RU 4, and may transmit and receive data through STA2 and RU 2 and 3.
  • PSDU or PPDU for the corresponding terminal may be delivered through the allocated RU.
  • 29 is a diagram illustrating an embodiment of a method for transmitting a PSDU through multiple RUs.
  • the AP may transmit one PSDU (or PPDU) to STA2 through RU 2 and RU 3.
  • STA2 may transmit one PSDU (/PPDU) through RU 2 and RU 3 allocated to itself.
  • the AP transmits one PSDU (or PPDU) to STA1 using RU 1 and RU 4 (in this case, one part of the PSDU (or PPDU) is transmitted through RU 1, and the other part This can be transmitted over RU 4).
  • STA1 may transmit one PSDU (/PPDU) through the allocated RU 1 and RU 4.
  • FIG. 30 is a diagram illustrating an embodiment of a method of transmitting a PSDU through multiple RUs.
  • the transmitting STA wants to transmit one MAC data (or PSDU) to one receiving STA through multiple RUs as shown in FIGS. 29 and/or 30, it is important to properly arrange the information bits of the PSDU in each RU.
  • the structure of the transmitter block can be changed. For example, depending on whether the number of modulation and coding scheme (MCS) and/or the number of streams transmitted by each RU is the same or different, the structure or design of the transmitter block may be changed.
  • MCS modulation and coding scheme
  • the modulation and coding scheme may include information related to what modulation is used (eg, BPSK, QPSK, 16QAM, etc.), coding rate, etc., and which coding is used. Information related to whether or not (for example, low density parity check (LDPC) or binary convolutional coding (BCC)) may not be included.
  • LDPC low density parity check
  • BCC binary convolutional coding
  • 31A and 31B are diagrams illustrating an embodiment of a transport block structure of a transmitting STA.
  • 31A and 31B show an example of a transmitter block structure in which a transmitting STA allocates multiple RUs to a receiving STA (eg, STA1), using a different MCS for each RU and using a different number of streams. .
  • a transmitting STA allocates multiple RUs to a receiving STA (eg, STA1), using a different MCS for each RU and using a different number of streams.
  • the transmitter block of FIGS. 31A and 31B shows an example in which N RUs are allocated to one STA.
  • a BCC encoder may be applied to the transport block.
  • a different MCS and a different number of streams can be applied to each RU of STA1 using the transmitter block.
  • bits of the PSDU may be distributed to RUs allocated through a parser. For example, one of the following methods may be used.
  • the transport block can be distributed to the allocated RUs alternately one by one in the order of bits coming from the MAC layer.
  • the transmitting STA may allocate odd-numbered bits to RU 1 and even-numbered bits to RU 2. This method can be used when the RU size and MCS are the same.
  • the transport block may transmit the PSDU by dividing the PSDU into an appropriate size in consideration of the RU size allocated to the receiving STA and the MCS of data. For example, the number of bits allocated in proportion to the RU size may be determined.
  • FIG. 32 is a diagram illustrating an embodiment of a method for dividing a PSDU.
  • Part 1 may be transmitted through RU 1 and Part 2 may be transmitted through RU 2.
  • RU 1 is 484 ton RU
  • RU 2 is 484 ton RU
  • RU 1 is 996 ton RU
  • RU 2 is 996 ton RU
  • the ratio of bits allocated to Part 1 and Part 2 is 1 May be :1.
  • 33A and 33B are diagrams illustrating an embodiment of a transport block structure of a transmitting STA.
  • FIGS. 31A and 31B are an embodiment of a transport block when a BCC encoder is used
  • FIG. 33 is an embodiment of a transport block when an LDPC encoder is used.
  • 34 is a diagram illustrating an embodiment of a transport block structure of a transmitting STA.
  • an LDPC encoder may be used.
  • the LDPC encoder is only one embodiment, and a BCC encoder may be used.
  • the number of streams included in each RU may be the same.
  • the same MCS or different MCS may be used for each RU.
  • the transmitting STA may generate the encoded data field by encoding the data field.
  • LDPC or BCC may be used as the encoding technique.
  • the transmitting STA may generate at least one stream from a data field encoded by a stream parser.
  • the stream parser may divide the encoded data field into at least one stream.
  • the number of bits allocated for each stream may be based on the MCS applied to each stream.
  • the number of bits allocated to each stream may be based on the value of s in Equation 12 below.
  • N - BPSCS is the number of encoded bits per subcarrier.
  • the modulation applied to the first stream is BPSK and the modulation applied to the second stream is 16-QAM
  • 1 bit is allocated to the first stream
  • 2 bits may be allocated to the second stream.
  • an encoded bit may be allocated to the first and second streams by 1 bit and 2 bits, and the operation may be repeated until all the encoded bits are allocated to the first and second streams. That is, a round robin technique that is alternately allocated by 1 bit and 2 bits may be used.
  • the data field encoded by the stream parser may be divided into at least one stream.
  • At least one stream may be divided into a plurality of segments by a segment parser.
  • segment parsers may exist as many as the number of streams allocated to the terminal.
  • the segment parser may distribute the encoded bits of the stream to RUs allocated to the terminal.
  • interleaver design may be required. For example, it may be necessary to design a new interleaver. For example, if a segment parser exists between a stream parser and a BCC interleaver, interleaver design may be required, and if a segment parser exists between a BCC interleaver and a constellation mapper, interleaver design may not be required.
  • Segment parser may exist after constellation mapper. That is, the operation by the segment parser may be performed after constellation mapping. If the interleaver is not additionally designed, the interleaver can operate for each RU previously defined.
  • the stream divided by the stream parser may be divided into a plurality of segments by the segment parser.
  • the number of segments may be based on the number of RUs allocated to the STA. For example, when two RUs are allocated to the first STA, each stream may be divided into two segments. For example, when three RUs are allocated to the first STA, each stream may be divided into three segments. For example, when 4 RUs are allocated to the first STA, each stream may be divided into 4 segments.
  • data transmitted through RU#1 may constitute one segment
  • data transmitted through RU#2 may constitute one segment
  • data transmitted through RU#N may constitute one segment. You can organize your segments.
  • the number of bits allocated for each segment may be related to the size of the RU corresponding to each segment. For example, when the first segment is transmitted through the first RU, the bit corresponding to the first segment may be based on the size of the first RU. For example, when a first segment is transmitted through a first RU, a second segment is transmitted through a second RU, and a third segment is transmitted through a third RU, first, second, and third The number of bits allocated to the segment may be related to the sizes of the first, second, and third RUs.
  • the ratio of the number of bits allocated to the first, second, and third segments is 1 May be :2:2.
  • the ratio of the number of bits allocated to the first, second, and third segments is 1 May be :1:1.
  • the number of bits allocated for each segment at one time may be based on the s value of Equation 12 above. For example, when a first RU is a 484 ton RU, a second RU is a 996 ton RU, and a third RU is a 996 ton RU, the number of bits allocated to the first segment may be 1s, and the second segment The number of bits allocated to the first segment may be 2s, and the number of bits allocated to the third segment may be 3s.
  • each stream may be allocated to the first, second, and third segments by 1s bit, 2s bit, and 2s bit, and the operation is that all bits of the stream are the first, second, and third segments. Can be repeated until assigned to. That is, a round robin technique in which 1s bits, 2s bits, and 2s bits are alternately allocated may be used.
  • first RU when a first RU is a 242 ton RU, a second RU is a 484 ton RU, and a third RU is a 996 ton RU, only two segments may be configured, and the first segment is through the first RU. It includes data transmitted through the second RU and data transmitted through the second RU, and the second segment may include data transmitted through the third RU.
  • the ratio of the number of bits allocated to the first and second segments may be 3:4.
  • the number of bits allocated to the first segment at one time may be 3s
  • the number of bits allocated to the second segment at one time may be 4s.
  • the number of RUs allocated to the receiving STA may vary.
  • the transmitting STA may perform at least one of a procedure of constellation mapping, LDPC tone mapping, space time block coding (STBC), and Spatial mapping for each segment.
  • STBC space time block coding
  • the transmitting STA may perform at least one of the procedures of BCC interleaving, constellation mapping, STBC, and Spatial mapping for each segment.
  • PSDUs When a plurality of multiple RUs (RUs) are allocated to the receiving STA, different PSDUs (or PPDUs) may be transmitted through each RU.
  • 35 is a diagram illustrating an embodiment of a method for transmitting a PSDU through multiple RUs.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA2 through RU 2, and may transmit PSDU#2 (or PPDU#2) through RU 3 have.
  • STA2 may transmit PSDU#1 (or PPDU#1) through RU 2 allocated to it, and may transmit PSDU#2 (or PPDU#2) through RU 3.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and may transmit PSDU#2 (or PPDU#2) to STA1 through RU 4.
  • PSDU#1 or PPDU#1
  • PSDU#2 or PPDU#2
  • PSDU#1 (or PPDU#1) may be transmitted through RU 1 to which STA1 is assigned, and PSDU#2 (or PPDU#2) may be transmitted through RU 4.
  • FIG. 36 is a diagram illustrating an embodiment of a method for transmitting a PSDU through multiple RUs.
  • the transmitting STA may transmit the same PSDU (or PPDU) to the receiving STA.
  • the transmitting STA may transmit the first PSDU (or data field) to the receiving STA through the first RU, and may transmit a second PSDU that duplicates the first PSDU through the second RU.
  • the PPDU transmitted by the transmitting STA may be transmitted through the first RU and the second RU, and the PPDU may include a first PSDU and a second PSDU.
  • the first PSDU and the second PSDU transmitted through the first RU and the second RU may be configured with the same data field, and the first PSDU and the second PSDU may be configured with the same data bits.
  • PPDU is a preamble (e.g., a legacy preamble, U-SIG (signal), EHT-SIG (signal) field), a training field (e.g., short training field (STF), long training field (LTF)) ), may include a first PSDU and a second PSDU.
  • the training field may be a signal for both the first PSDU and the second PSDU.
  • the preamble and training fields may be signals generated in the PHY layer, and PSDU may be signals generated in the MAC layer.
  • the AP may transmit PSDU#2 (or PPDU#2) to STA2 through RU 2, and PSDU#2 (i.e., a duplicated PSDU) as transmitted to STA2 through RU 2 through RU 3 #2) can be transmitted.
  • PSDU#2 or PPDU#2
  • PSDU#2 i.e., a duplicated PSDU
  • STA2 can transmit PSDU#2 (or PPDU#2) to the AP through RU 2 allocated to it, and PSDU#2 (i.e., the same PSDU#2 as transmitted to the AP through RU 2 through RU 3) , The duplicated PSDU#2) can be transmitted.
  • PSDU#2 or PPDU#2
  • PSDU#2 i.e., the same PSDU#2 as transmitted to the AP through RU 2 through RU 3
  • the duplicated PSDU#2 can be transmitted.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and PSDU#1 (i.e., the same as transmitted to STA1 through RU 1 through RU 1).
  • PSDU#1 can be transmitted.
  • PSDU #1 i.e., a duplicated PSDU as transmitted to the AP through RU 1 through RU 1 to which STA1 is allocated, and transmits PSDU #1 (or PPDU#1) to the AP through RU 1 through RU 4 #1) can be transmitted.
  • the bandwidth of each of PSDU#1 and PSDU#2 may be half of the bandwidth of a transmission channel between the transmitting STA and the receiving STA.
  • the two RUs may be separated from each other, such as RU 1 and RU 4 allocated to STA1, and consecutively, such as RU 2 and RU 3 allocated to STA2. Can exist.
  • the receiving STA may more reliably receive a frame (ie, data) through a frequency diversity gain.
  • the receiving STA since the receiving STA knows that the data is the same, it is possible to combine the frames received by each RU and to receive the frames more reliably. Therefore, more reliable transmission can be performed.
  • an indication information indicating whether the same PSDU (data) is transmitted is one of the SIG fields transmitted before the PSDU (e.g., EHT-SIG A/B/C, or EHT-HARQ-SIG 1/2/3, etc.) Can be included in the preamble part.
  • the STA receiving the PPDU can know whether the same PSDU (or data) is transmitted through another RU through information included in the PHY header.
  • the receiving STA may determine whether to combine the duplicated PSDU (or data), and may perform a combining operation of the PSDU (or data) and the duplicated PSDU.
  • PSDU mentioned in the above embodiments is an example, and is replaced by other terms/units such as PPDU, frame, data, information bits, encoded data or encoded information bits, HARQ frame/data/burst, A-MPDU/MPDU, etc. Can be.
  • 37 is a diagram illustrating an embodiment of a method of transmitting HARQ data through multiple RUs.
  • the receiving STA decodes or combines HARQ data #1 transmitted from each RU, respectively (e.g., soft LLR (log PSDU (or A-MPDU) can be read by combining) likelihood ratio).
  • soft LLR log PSDU (or A-MPDU) can be read by combining
  • the receiving STA decodes or combines (e.g., soft LLR combining) HARQ data #2 transmitted from each RU respectively to PSDU (or A -MPDU) can be read.
  • 38 is a diagram illustrating an embodiment of a method of transmitting HARQ data through multiple RUs.
  • HARQ data when HARQ data is transmitted through the HARQ incremental redundancy (IR) method, different versions of redundancy for the same HARQ data may be transmitted to different RUs.
  • IR HARQ incremental redundancy
  • packet version #1 of HARQ data #1 may be transmitted to STA1 through RU 1
  • Packet version #2 of HARQ data #1 may be transmitted to STA1 through RU 4.
  • STA1 may receive packet version #1 and packet version #2 of HARQ data #1 transmitted through RU 1 and RU 4.
  • STA1 may combine packet version #1 and packet version #2 of the received HARQ data #1, and read information bits for HARQ data #1.
  • the AP may transmit packet version #1 of HARQ data #2 to STA2 through RU 2, and may transmit packet version #2 of HARQ data #2 to STA2 through RU 3.
  • STA2 may receive packet version #1 and packet version #2 of HARQ data #2 transmitted through RU 2 and RU 3.
  • STA2 may combine packet version #1 and packet version #2 of the received HARQ data #2, and read information bits for HARQ data #2.
  • the STA1 may transmit packet version #1 of HARQ data #1 through RU 1 and may transmit packet version #2 of HARQ data #1 through RU 4.
  • the AP may receive packet version #1 and packet version #2 of HARQ data #1 transmitted through RU 1 and RU 4.
  • the AP may combine packet version #1 and packet version #2 of the received HARQ data #1, and read information bits for HARQ data #1.
  • STA2 may transmit packet version #1 of HARQ data #2 through RU 2, and may transmit packet version #2 of HARQ data #2 to RU 3.
  • the AP may receive packet version #1 and packet version #2 of HARQ data #2 transmitted through RU 2 and RU 3.
  • the AP may combine packet version #1 and packet version #2 of the received HARQ data #2, and read information bits for HARQ data #2.
  • HARQ data number (#N) and a corresponding packet version number may be included in at least one of the SIG fields (eg, HARQ-SIG, EHT-SIG-B, etc.).
  • the STA and the AP include information related to whether multiple RUs allocation is supported (supporting) in the Capability (or, Operation) element (e.g., EHT Capability (or, Operation) element) and transmit their capability to the peer STA. Information can be communicated.
  • Capability or, Operation element
  • EHT Capability or, Operation
  • the same (i.e., duplicated) data is included in the other RU and transmits/receives information on whether the capability (or, operation) element (eg, EHT Capability (or, Operation) element) and transmits it to inform the peer STA of its capability information.
  • the capability (or, operation) element eg, EHT Capability (or, Operation) element
  • 39 and 40 are diagrams illustrating an embodiment of a method of transmitting a PSDU through multiple RUs.
  • the transmitting STA may transmit the same PSDU (or PPDU) to the receiving STA.
  • the transmitting STA may transmit the first PSDU (or data field) to the receiving STA through the first RU, and may transmit a second PSDU that duplicates the first PSDU through the second RU.
  • the PPDU transmitted by the transmitting STA may be transmitted through the first RU and the second RU, and the PPDU may include a first PSDU and a second PSDU.
  • the first PSDU and the second PSDU transmitted through the first RU and the second RU may be configured with the same data field, and the first PSDU and the second PSDU may be configured with the same data bits.
  • PPDU is a preamble (e.g., a legacy preamble, U-SIG (signal), EHT-SIG (signal) field), a training field (e.g., short training field (STF), long training field (LTF)) ), may include a first PSDU and a second PSDU.
  • the training field may be a signal for both the first PSDU and the second PSDU.
  • the preamble and training fields may be signals generated in the PHY layer, and PSDU may be signals generated in the MAC layer.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and PSDU#1 (i.e., duplicated) as transmitted to STA1 through RU 2 using RU 2 PSDU#1) can be transmitted.
  • PSDU#1 or PPDU#1
  • PSDU#1 i.e., duplicated
  • the PSDU#1 i.e., the duplicated PSDU as transmitted to the AP through RU 1 through RU 1 to which STA1 is assigned, and transmits the PSDU#1 (or PPDU#1) to the AP through RU 1 through RU 2 #1) can be transmitted.
  • the bandwidth of each of the PSDU#1 and the duplicated PSDU#1 may be half the bandwidth of the transmission channel between the transmitting STA and the receiving STA.
  • the transport channel may have a bandwidth of 40 MHz or 80 MHz, and RU 1 and RU 2 may be a 242 tone RU or a 484 tone RU.
  • the two RUs may exist apart from each other or may exist continuously.
  • the receiving STA may more reliably receive a frame (ie, data) through a frequency diversity gain.
  • the receiving STA since the receiving STA knows that the data is the same, it is possible to combine the frames received by each RU and to receive the frames more reliably. Therefore, more reliable transmission can be performed.
  • an indication information indicating whether the same PSDU (data) is transmitted is one of the SIG fields transmitted before the PSDU (e.g., EHT-SIG A/B/C, or EHT-HARQ-SIG 1/2/3, etc.) Can be included in the preamble part.
  • the STA receiving the PPDU can know whether the same PSDU (or data) is transmitted through another RU through information included in the PHY header.
  • the receiving STA may determine whether to combine the duplicated PSDU (or data), and may perform a combining operation of the PSDU (or data) and the duplicated PSDU.
  • PSDU mentioned in the above embodiments is an example, and is replaced by other terms/units such as PPDU, frame, data, information bits, encoded data or encoded information bits, HARQ frame/data/burst, A-MPDU/MPDU, etc. Can be.
  • 41 is a diagram illustrating an embodiment of an operating method of a transmitting STA.
  • the transmitting STA may generate a PPDU (S4110).
  • the transmitting STA may generate a physical protocol data unit (PPDU) including a first data field (eg, PSDU#1) and a second data field (eg, PSDU#2).
  • the second data field eg, PSDU#2 may be generated by duplicating the first data field (eg, PSDU#1).
  • the transmitting STA may transmit a PPDU (S4120).
  • the transmitting STA may transmit the PPDU to the receiving STA through a transport channel.
  • the bandwidth of each of the first and second data fields may be half of the transmission channel bandwidth.
  • the bandwidth of each of the PSDU#1 and PSDU#2 may be half of the bandwidth of the transmission channel between the transmitting STA and the receiving STA.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA2 through RU 2, and may transmit PSDU#2 (or PPDU#2) through RU 3.
  • STA2 may transmit PSDU#1 (or PPDU#1) through RU 2 allocated to it, and may transmit PSDU#2 (or PPDU#2) through RU 3.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and may transmit PSDU#2 (or PPDU#2) to STA1 through RU 4.
  • PSDU#1 (or PPDU#1) may be transmitted through RU 1 to which STA1 is assigned
  • PSDU#2 (or PPDU#2) may be transmitted through RU 4.
  • the transmitting STA may transmit the first PSDU (or data field) to the receiving STA through the first RU, and may transmit a second PSDU that duplicates the first PSDU through the second RU.
  • the PPDU transmitted by the transmitting STA may be transmitted through the first RU and the second RU, and the PPDU may include a first PSDU and a second PSDU.
  • the first PSDU and the second PSDU transmitted through the first RU and the second RU may be configured with the same data field, and the first PSDU and the second PSDU may be configured with the same data bits.
  • PPDU is a preamble (e.g., a legacy preamble, U-SIG (signal), EHT-SIG (signal) field), a training field (e.g., short training field (STF), long training field (LTF)) ), may include a first PSDU and a second PSDU.
  • the training field may be a signal for both the first PSDU and the second PSDU.
  • the preamble and training fields may be signals generated in the PHY layer, and PSDU may be signals generated in the MAC layer.
  • the AP may transmit PSDU#2 (or PPDU#2) to STA2 through RU 2, and PSDU#2 (i.e., duplicated PSDU#2) as transmitted to RU 2 through RU 3 Can be transmitted.
  • PSDU#2 or PPDU#2
  • PSDU#2 i.e., duplicated PSDU#2
  • STA2 may transmit PSDU#2 (or PPDU#2) through RU 2 allocated to itself, and PSDU#2 (i.e., a duplicate PSDU#) as transmitted to RU 2 through RU 3 2) can be transmitted.
  • PSDU#2 i.e., a duplicate PSDU#
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and PSDU#1 (i.e., duplicated PSDU#) as transmitted through RU 1 using RU 4 1) can be transmitted.
  • PSDU#1 i.e., duplicated PSDU#
  • the PSDU#1 (or PPDU#1) is transmitted through RU 1 to which STA1 is allocated, and the same PSDU#1 (i.e., duplicated PSDU#1) as transmitted through RU 1 through RU 4 Can be transmitted.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and PSDU#1 (i.e., duplicated) as transmitted to STA1 through RU 2 using RU 2 PSDU#1) can be transmitted.
  • PSDU#1 or PPDU#1
  • PSDU#1 i.e., duplicated
  • the PSDU#1 i.e., the duplicated PSDU as transmitted to the AP through RU 1 through RU 1 to which STA1 is assigned, and transmits the PSDU#1 (or PPDU#1) to the AP through RU 1 through RU 2 #1) can be transmitted.
  • the bandwidth of each of the PSDU#1 and the duplicated PSDU#1 may be half the bandwidth of the transmission channel between the transmitting STA and the receiving STA.
  • the transport channel may have a bandwidth of 40 MHz or 80 MHz, and RU 1 and RU 2 may be a 242 tone RU or a 484 tone RU.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and PSDU#1 (i.e., duplicated) as transmitted to STA1 through RU 2 using RU 2 PSDU#1) can be transmitted.
  • PSDU#1 or PPDU#1
  • PSDU#1 i.e., duplicated
  • the PSDU#1 i.e., the duplicated PSDU as transmitted to the AP through RU 1 through RU 1 to which STA1 is assigned, and transmits the PSDU#1 (or PPDU#1) to the AP through RU 1 through RU 2 #1) can be transmitted.
  • the bandwidth of each of the PSDU#1 and the duplicated PSDU#1 may be half the bandwidth of the transmission channel between the transmitting STA and the receiving STA.
  • the transport channel may have a bandwidth of 40 MHz or 80 MHz, and RU 1 and RU 2 may be a 242 tone RU or a 484 tone RU.
  • the receiving STA may more reliably receive a frame (ie, data) through a frequency diversity gain.
  • the receiving STA since the receiving STA knows that the data is the same, it is possible to combine the frames received by each RU and to receive the frames more reliably. Therefore, more reliable transmission can be performed.
  • an indication information indicating whether the same PSDU (data) is transmitted is one of the SIG fields transmitted before the PSDU (e.g., EHT-SIG A/B/C, or EHT-HARQ-SIG 1/2/3, etc.) Can be included in the preamble part.
  • the STA receiving the PPDU can know whether the same PSDU (or data) is transmitted through another RU through information included in the PHY header.
  • the receiving STA may determine whether to combine the duplicated PSDU (or data), and may perform a combining operation of the PSDU (or data) and the duplicated PSDU.
  • PSDU mentioned in the above embodiments is an example, and is replaced with other terms/units such as PPDU, frame, data, information bits, encoded data or encoded information bits, HARQ frame/data/burst, A-MPDU/MPDU, etc. Can be.
  • FIG. 42 is a diagram illustrating an embodiment of an operating method of a receiving STA.
  • a receiving STA may receive a PPDU (S4210).
  • the receiving STA may receive a physical protocol data unit (PPDU) including a first data field (eg, PSDU#1) and a second data field (eg, PSDU#2).
  • the second data field eg, PSDU#2 may be generated by duplicating the first data field (eg, PSDU#1).
  • the receiving STA may decode the PPDU (S4220).
  • the receiving STA may receive the PPDU from the transmitting STA through a transport channel.
  • the bandwidth of each of the first and second data fields may be half of the transmission channel bandwidth.
  • the bandwidth of each of the PSDU#1 and PSDU#2 may be half of the bandwidth of the transmission channel between the transmitting STA and the receiving STA.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA2 through RU 2, and may transmit PSDU#2 (or PPDU#2) through RU 3.
  • STA2 may transmit PSDU#1 (or PPDU#1) through RU 2 allocated to it, and may transmit PSDU#2 (or PPDU#2) through RU 3.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and may transmit PSDU#2 (or PPDU#2) to STA1 through RU 4.
  • PSDU#1 (or PPDU#1) may be transmitted through RU 1 to which STA1 is assigned
  • PSDU#2 (or PPDU#2) may be transmitted through RU 4.
  • the transmitting STA may transmit the first PSDU (or data field) to the receiving STA through the first RU, and may transmit a second PSDU that duplicates the first PSDU through the second RU.
  • the PPDU transmitted by the transmitting STA may be transmitted through the first RU and the second RU, and the PPDU may include a first PSDU and a second PSDU.
  • the first PSDU and the second PSDU transmitted through the first RU and the second RU may be configured with the same data field, and the first PSDU and the second PSDU may be configured with the same data bits.
  • PPDU is a preamble (e.g., a legacy preamble, U-SIG (signal), EHT-SIG (signal) field), a training field (e.g., short training field (STF), long training field (LTF)) ), may include a first PSDU and a second PSDU.
  • the training field may be a signal for both the first PSDU and the second PSDU.
  • the preamble and training fields may be signals generated in the PHY layer, and PSDU may be signals generated in the MAC layer.
  • the AP may transmit PSDU#2 (or PPDU#2) to STA2 through RU 2, and PSDU#2 (i.e., duplicated PSDU#2) as transmitted to RU 2 through RU 3 Can be transmitted.
  • PSDU#2 or PPDU#2
  • PSDU#2 i.e., duplicated PSDU#2
  • STA2 may transmit PSDU#2 (or PPDU#2) through RU 2 allocated to itself, and PSDU#2 (i.e., a duplicate PSDU#) as transmitted to RU 2 through RU 3 2) can be transmitted.
  • PSDU#2 i.e., a duplicate PSDU#
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and PSDU#1 (i.e., duplicated PSDU#) as transmitted through RU 1 using RU 4 1) can be transmitted.
  • PSDU#1 i.e., duplicated PSDU#
  • the PSDU#1 (or PPDU#1) is transmitted through RU 1 to which STA1 is allocated, and the same PSDU#1 (i.e., duplicated PSDU#1) as transmitted through RU 1 through RU 4 Can be transmitted.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and PSDU#1 (i.e., duplicated) as transmitted to STA1 through RU 2 using RU 2 PSDU#1) can be transmitted.
  • PSDU#1 or PPDU#1
  • PSDU#1 i.e., duplicated
  • the PSDU#1 i.e., the duplicated PSDU as transmitted to the AP through RU 1 through RU 1 to which STA1 is assigned, and transmits the PSDU#1 (or PPDU#1) to the AP through RU 1 through RU 2 #1) can be transmitted.
  • the bandwidth of each of the PSDU#1 and the duplicated PSDU#1 may be half the bandwidth of the transmission channel between the transmitting STA and the receiving STA.
  • the transport channel may have a bandwidth of 40 MHz or 80 MHz, and RU 1 and RU 2 may be a 242 tone RU or a 484 tone RU.
  • the AP may transmit PSDU#1 (or PPDU#1) to STA1 through RU 1, and PSDU#1 (i.e., duplicated) as transmitted to STA1 through RU 2 using RU 2 PSDU#1) can be transmitted.
  • PSDU#1 or PPDU#1
  • PSDU#1 i.e., duplicated
  • the PSDU#1 i.e., the duplicated PSDU as transmitted to the AP through RU 1 through RU 1 to which STA1 is assigned, and transmits the PSDU#1 (or PPDU#1) to the AP through RU 1 through RU 2 #1) can be transmitted.
  • the bandwidth of each of the PSDU#1 and the duplicated PSDU#1 may be half the bandwidth of the transmission channel between the transmitting STA and the receiving STA.
  • the transport channel may have a bandwidth of 40 MHz or 80 MHz, and RU 1 and RU 2 may be a 242 tone RU or a 484 tone RU.
  • the receiving STA may more reliably receive a frame (ie, data) through a frequency diversity gain.
  • the receiving STA since the receiving STA knows that the data is the same, it is possible to combine the frames received by each RU and to receive the frames more reliably. Therefore, more reliable transmission can be performed.
  • an indication information indicating whether the same PSDU (data) is transmitted is one of the SIG fields transmitted before the PSDU (e.g., EHT-SIG A/B/C, or EHT-HARQ-SIG 1/2/3, etc.) Can be included in the preamble part.
  • the STA receiving the PPDU can know whether the same PSDU (or data) is transmitted through another RU through information included in the PHY header.
  • the receiving STA may determine whether to combine the duplicated PSDU (or data), and may perform a combining operation of the PSDU (or data) and the duplicated PSDU.
  • PSDU mentioned in the above embodiments is an example, and is replaced with other terms/units such as PPDU, frame, data, information bits, encoded data or encoded information bits, HARQ frame/data/burst, A-MPDU/MPDU, etc. Can be.
  • 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 may be 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 apparatus of the present specification includes a memory and a processor operatively coupled to the memory, wherein the processor includes a physical data field (PPDU) including a first data field and a second data field. protocol data unit), wherein the second data field is generated by duplicating the first data field, and the PPDU includes a preamble and a training field; Further, the PPDU is set to transmit the PPDU to the receiving STA through a transport channel, and a bandwidth of each of the first and second data fields may be half of the bandwidth of the transport channel.
  • PPDU physical data field
  • protocol data unit protocol data unit
  • the CRM proposed by the present specification is an instruction based on being executed by at least one processor of an STA (station) supporting multi-links of a wireless local area network (LAN) system.
  • a computer readable medium including ) a physical protocol data unit (PPDU) including a first data field and a second data field is generated, the The second data field is generated by duplicating the first data field, and the PPDU includes a preamble and a training field; And transmitting the PPDU to the receiving STA through a transport channel, wherein the bandwidth of each of the first and second data fields is half of the bandwidth of the transport channel, and instructions including the step may be stored.
  • PPDU physical protocol data unit
  • 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, etc. in a driving unit, and can travel on the ground or fly in the air through the driving unit.
  • Extended reality is a generic term for 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 ou un dispositif d'émission/réception d'une unité de données de protocole physique (PPDU) dans un système de réseau local sans fil. Le procédé comprend une étape de génération d'une PPDU comprenant des premier et deuxième champs de données, le deuxième champ de données étant généré par duplication du premier champ de données. De plus, la PPDU comprend un préambule et un champ d'apprentissage, et les largeurs de bande respectives des premier et deuxième champs de données sont la moitié d'une largeur de bande de canal d'émission PPDU.
PCT/KR2020/011211 2019-08-21 2020-08-21 Duplication de données pour émission fiable Ceased WO2021034155A1 (fr)

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WO2023191362A1 (fr) * 2022-03-29 2023-10-05 엘지전자 주식회사 Procédé et dispositif d'attribution d'une pluralité de ru ou mru afin de transmettre ou de recevoir simultanément une pluralité de psdu par une sta de réception dans un système lan sans fil
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WO2024250196A1 (fr) * 2023-06-07 2024-12-12 Oppo广东移动通信有限公司 Procédé de communication sans fil, dispositif d'extrémité d'envoi et dispositif d'extrémité de réception
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