WO2022169222A1 - Technique de transmission d'un signal d'entraînement long dans un système de réseau local sans fil - Google Patents

Technique de transmission d'un signal d'entraînement long dans un système de réseau local sans fil Download PDF

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WO2022169222A1
WO2022169222A1 PCT/KR2022/001583 KR2022001583W WO2022169222A1 WO 2022169222 A1 WO2022169222 A1 WO 2022169222A1 KR 2022001583 W KR2022001583 W KR 2022001583W WO 2022169222 A1 WO2022169222 A1 WO 2022169222A1
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ltf
matrix
initial
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extra
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PCT/KR2022/001583
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English (en)
Korean (ko)
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임동국
천진영
최진수
박은성
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • 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

  • This specification relates to transmitting a training signal in a wireless communication system, and more particularly, to transmitting a long training signal in a wireless LAN system.
  • a wireless local area network has been improved in various ways.
  • the IEEE 802.11ax standard proposes an improved communication environment using OFDMA (orthogonal frequency division multiple access) and DL MU downlink multi-user multiple input, multiple output (MIMO) techniques.
  • 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) specification that is being discussed recently.
  • the EHT standard may use a newly proposed increased bandwidth, an improved PHY layer protocol data unit (PPDU) structure, an improved sequence, a hybrid automatic repeat request (HARQ) technique, and the like.
  • the EHT standard may be referred to as an IEEE 802.11be standard.
  • a wide bandwidth eg, 160/320 MHz
  • 16 streams e.g., 16 streams
  • multi-link (or multi-band) operation may be used to support high throughput and high data rate.
  • a wide bandwidth (eg, 160/240/320 MHz) may be used for high throughput.
  • preamble puncturing and multiple RU transmission may be used.
  • a Physical Protocol Data Unit (PPDU) of a Wireless Local Area Network (WLAN) system includes a Long Training Field (LTF) signal.
  • the LTF signal consists of at least one LTF field.
  • the number of LTF fields included in one LTF signal may be determined based on the number of spatial streams related to the PPDU. For example, when the number of spatial streams is three or four, the number of LTF fields is fixed to four. For example, when the number of spatial streams is 5 or 6, the number of LTF fields is fixed to 6. For example, when the number of spatial streams is 7 or 8, the number of LTF fields is fixed to 8.
  • a new WLAN system including the EHT standard can support an increased number of spatial streams.
  • the number of spatial streams When the number of spatial streams is supported, a technical effect of increasing peak throughput may occur. If the number of spatial streams increases, the number of related LTF symbols may also increase. Also, for the purpose of improving the performance of channel estimation, the number of conventional LTF symbols may be increased. That is, the number of LTF symbols may be increased for various purposes and effects, and various technical characteristics regarding the increased LTF symbols should be defined.
  • the method based on the present specification may include, in a transmitting station (STA), configuring a Long Training Field (LTF) signal for channel estimation.
  • LTF Long Training Field
  • the number of LTF symbols included in the LTF signal may be the sum of the number of initial LTF symbols and the number of extra LTF symbols.
  • the number of initial LTF symbols may be determined based on the number of spatial streams configured by the transmitting STA.
  • the initial LTF symbol may be configured based on a multiplication of at least a portion of an LTF sequence and a P matrix.
  • the P matrix may be determined based on the number of spatial streams.
  • the number of extra LTF symbols may be determined based on the number of initial LTF symbols.
  • the extra LTF symbol may be configured based on a multiplication of at least a portion of the LTF sequence and the P matrix.
  • the number of LTF symbols may be increased for various purposes.
  • a technical effect of improving the reception performance of the receiving STA occurs because the performance of channel estimation is improved.
  • An example of the present specification proposes a technical feature for efficiently generating an increased LTF symbol.
  • the present specification proposes a technical feature of generating an initial LTF symbol and an extra LTF symbol based on at least one orthogonal matrix (or P matrix).
  • an example of the present specification proposes an improved technical feature indicating information related to an increased LTF symbol. Based on an example of the present specification, information related to the increased LTF symbol may be accurately transmitted to the receiving STA, and the receiving STA may increase channel reception performance through this.
  • FIG. 1 shows an example of a transmitting apparatus and/or a receiving apparatus of the present specification.
  • WLAN wireless local area network
  • FIG. 3 is a diagram illustrating an example of a PPDU used in the IEEE standard.
  • FIG. 4 is a diagram illustrating an arrangement of a resource unit (RU) used on a 20 MHz band.
  • RU resource unit
  • FIG. 5 is a diagram illustrating an arrangement of a resource unit (RU) used on a 40 MHz band.
  • RU resource unit
  • FIG. 6 is a diagram illustrating an arrangement of resource units (RUs) used on an 80 MHz band.
  • FIG 8 shows an example in which a plurality of user STAs are allocated to the same RU through the MU-MIMO technique.
  • FIG. 10 shows an example of a channel used/supported/defined in the 2.4 GHz band.
  • FIG. 11 shows an example of a channel used/supported/defined within the 5 GHz band.
  • FIG. 13 shows an example of a PPDU used in this specification.
  • FIG. 14 shows a modified example of a transmitting apparatus and/or a receiving apparatus of the present specification.
  • 15 is a diagram illustrating an arrangement of resource units (RUs) used on an 80 MHz band.
  • 16 shows an example of an EHT PPDU.
  • FIG 17 shows an example of a first control signal field or a U-SIG field of the present specification.
  • FIG. 19 is a diagram illustrating a concept of constructing an LTF symbol based on a conventional HT-LTF generation sequence.
  • 20 is a block diagram illustrating the format of an EHT Capabilities element.
  • 21 is a diagram illustrating an example in which a P matrix corresponding to TN_LTF is used.
  • FIG. 22 is a diagram illustrating an example in which a P matrix corresponding to the total number of spatial streams or IN_LTF is used.
  • 23 is a flowchart illustrating an operation performed by a transmitting STA.
  • 24 is a flowchart illustrating an operation performed by 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) herein means “only A”, “only B”, “only C”, or “any and any combination of A, B and C ( any combination of A, B and C)”.
  • a slash (/) or a comma (comma) used herein may mean “and/or”.
  • A/B may mean “A and/or B”. Accordingly, “A/B” may mean “only A”, “only B”, or “both A and B”.
  • A, B, C may mean “A, B, or C”.
  • At least one of A and B may mean “only A”, “only B” or “both A and B”.
  • the expression “at least one of A or B” or “at least one of A and/or B” means “at least one It can be interpreted the same as “at least one of A and B”.
  • At least one of A, B and C means “only A”, “only B”, “only C”, or “A, B and C” any combination of A, B and C”. Also, “at least one of A, B or C” or “at least one of A, B and/or C” means may mean “at least one of A, B and C”.
  • control information EHT-Signal
  • EHT-Signal when displayed as “control information (EHT-Signal)”, “EHT-Signal” may be proposed as an example of “control information”.
  • control information of the present specification is not limited to “EHT-Signal”, and “EHT-Signal” may be proposed as an example of “control information”.
  • EHT-signal even when displayed as “control information (ie, EHT-signal)”, “EHT-signal” may be proposed as an example of “control information”.
  • the following examples of the present specification may 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.
  • the present specification may be applied to the IEEE 802.11a/g/n/ac standard or the IEEE 802.11ax standard.
  • the present specification may be applied to a newly proposed EHT standard or IEEE 802.11be standard.
  • an example of the present specification may be applied to a new wireless LAN standard that is an enhancement of the EHT standard or 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 the 5G NR standard based on the 3GPP standard.
  • FIG. 1 shows an example of a transmitting apparatus and/or a receiving apparatus of the present specification.
  • the example of FIG. 1 may perform various technical features described below.
  • 1 relates to at least one STA (station).
  • the STAs 110 and 120 of the present specification are a mobile terminal, a wireless device, a wireless transmit/receive unit (WTRU), a user equipment (UE), It may also be called by various names such as a mobile station (MS), a mobile subscriber unit, or simply a user.
  • the 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 may be referred to by various names such as a receiving device (apparatus), 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.
  • a communication standard eg, LTE, LTE-A, 5G NR standard
  • the STA of the present specification may be implemented in 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) conforming to the IEEE 802.11 standard and a physical layer interface for a wireless medium.
  • MAC medium access control
  • the STAs 110 and 120 will be described based on 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 one chip.
  • the transceiver 113 of the first STA performs a signal transmission/reception operation. Specifically, IEEE 802.11 packets (eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.) may be transmitted/received.
  • IEEE 802.11 packets eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.
  • 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 the 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 to be transmitted through the transceiver (ie, a transmission signal).
  • the second STA 120 may perform an intended operation of a non-AP STA.
  • the transceiver 123 of the non-AP 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. may be transmitted/received.
  • the processor 121 of the non-AP STA may receive a signal through the transceiver 123 , process the 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 received 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 denoted as an AP in the following specification may be performed by the first STA 110 or the second STA 120 .
  • the operation of the device marked as AP is controlled by the processor 111 of the first STA 110 , and is controlled by the processor 111 of the first STA 110 .
  • Related signals may be transmitted or received via the controlled transceiver 113 .
  • control information related to an 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 via the transceiver 123 that is used.
  • control information related to an operation of the AP or a transmission/reception signal of the AP may be stored in the memory 122 of the second STA 110 .
  • an operation of a device indicated as a non-AP in the following specification 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 ( A related signal may be transmitted or received via the transceiver 123 controlled by 121 .
  • control information related to the operation of the non-AP or the AP transmit/receive signal may be stored in the memory 122 of the second STA 120 .
  • the operation of the device marked as non-AP is controlled by the processor 111 of the first STA 110 , and the processor ( Relevant signals may be transmitted or received via transceiver 113 controlled by 111 .
  • control information related to the operation of the non-AP or the AP transmit/receive signal may be stored in the memory 112 of the first STA 110 .
  • transmission / reception STA STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmission / reception) Terminal, (transmission / reception) device , (transmission/reception) apparatus, network, and the like may refer to the STAs 110 and 120 of FIG. 1 .
  • a device indicated by a /receiver) device, a (transmit/receive) apparatus, and a network may also refer to the STAs 110 and 120 of FIG. 1 .
  • an operation in which various STAs transmit and receive signals may be performed by the transceivers 113 and 123 of FIG. 1 .
  • an operation in which various STAs generate a transmit/receive signal or perform data processing or calculation in advance for the transmit/receive signal 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 operation in advance for a transmission/reception signal is 1) Determining bit information of a subfield (SIG, STF, LTF, Data) field included in a PPDU /Acquisition/configuration/computation/decoding/encoding operation, 2) time resource or frequency resource (eg, subcarrier resource) used for the subfield (SIG, STF, LTF, Data) field included in the PPDU, etc.
  • a power control operation and / or a power saving operation applied to the STA may include
  • various information used by various STAs for determination/acquisition/configuration/computation/decoding/encoding of transmit/receive signals may be stored in the memories 112 and 122 of FIG. 1 .
  • the device/STA of the sub-view (a) of FIG. 1 described above may be modified as shown in the sub-view (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 shown in (b) of FIG. 1 may perform the same function as the transceivers shown in (a) of FIG. 1 .
  • the processing chips 114 and 124 illustrated in (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 shown in (b) of FIG. 1 are the processors 111 and 121 and the memories 112 and 122 shown in (a) of FIG. ) can perform the same function.
  • a technical feature in which a transmitting STA transmits a control signal is that the control signal generated by the processors 111 and 121 shown in the sub-drawing (a)/(b) of FIG. 1 is (a) of FIG. ) / (b) 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 the control signal to be transmitted to the transceivers 113 and 123 is generated from the processing chips 114 and 124 shown in the sub-view (b) of FIG. can be understood
  • the technical feature in which the receiving STA receives the control signal may be understood as the technical feature in which the control signal is received by the transceivers 113 and 123 shown in the 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 the sub-drawing (a) of FIG. 1 is the processor shown in (a) of FIG. 111, 121) can be understood as a technical feature obtained by.
  • 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 the sub-view (b) of FIG. 1 is the processing chip shown in the sub-view (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 .
  • Software code 115, 125 may be included in a variety of programming languages.
  • the processors 111 and 121 or the processing chips 114 and 124 shown in FIG. 1 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and/or data processing devices.
  • the processor may be an application processor (AP).
  • the processors 111 and 121 or the processing chips 114 and 124 shown in FIG. 1 may include a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (Modem). and demodulator).
  • DSP digital signal processor
  • CPU central processing unit
  • GPU graphics processing unit
  • Modem modem
  • demodulator demodulator
  • SNAPDRAGONTM series processor manufactured by Qualcomm®, an EXYNOSTM series processor manufactured by Samsung®, and a processor manufactured by Apple®. It may be an A series processor, a HELIOTM series processor manufactured by MediaTek®, an ATOMTM series processor manufactured by INTEL®, or a processor enhanced therewith.
  • 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.
  • 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 local area network
  • FIG. 2 shows the structure of an infrastructure basic service set (BSS) of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.
  • BSS infrastructure basic service set
  • IEEE Institute of Electrical and Electronic Engineers
  • a WLAN system may include one or more infrastructure BSSs 200 and 205 (hereinafter, BSSs).
  • BSSs 200 and 205 are a set of APs and STAs, such as an access point (AP) 225 and a station 200-1 (STA1) that can communicate with each other through successful synchronization, and are not a concept indicating a specific area.
  • the BSS 205 may include one or more combinable STAs 205 - 1 and 205 - 2 to one AP 230 .
  • the BSS may include at least one STA, APs 225 and 230 that provide a distribution service, and a distribution system DS 210 that connects a plurality of APs.
  • the distributed system 210 may implement an extended service set (ESS) 240 that is an extended service set by connecting several BSSs 200 and 205 .
  • ESS 240 may be used as a term indicating one network in which one or several APs are connected 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 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 establishes a network and performs communication 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 illustrating the IBSS.
  • the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not include an AP, there is no centralized management entity that performs a centralized management function. 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 mobile STAs, and access to a distributed system is not allowed, so a self-contained network network) is formed.
  • FIG. 3 is a diagram illustrating an example of a PPDU used in the IEEE standard.
  • PPDUs PHY protocol data units
  • the LTF and STF fields included a training signal
  • SIG-A and SIG-B included control information for the receiving station
  • the data field included user data corresponding to MAC PDU/Aggregated MAC PDU (PSDU). included
  • the HE PPDU according to FIG. 3 is an example of a PPDU for multiple users.
  • HE-SIG-B may be included only for multiple users, and the corresponding HE-SIG-B may be omitted from the PPDU for a single user.
  • 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 interval (ie, 4 or 8 ⁇ s, etc.).
  • a resource unit may include a plurality of subcarriers (or tones).
  • the resource unit may be used when transmitting a signal to a plurality of 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 may be used for STF, LTF, data field, and the like.
  • FIG. 4 is a diagram illustrating an arrangement of a resource unit (RU) used on a 20 MHz band.
  • RU resource unit
  • 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 RUs shown for HE-STF, HE-LTF, and data fields.
  • 26-units ie, units corresponding to 26 tones
  • Six tones may be used as a guard band in the leftmost band of the 20 MHz band, and 5 tones may be used as a guard band in the rightmost band of the 20 MHz band.
  • 7 DC tones are inserted into the center band, that is, the DC band, and 26-units corresponding to each of 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 may be assigned for a receiving station, ie a user.
  • the RU arrangement of FIG. 4 is utilized not only in a situation for a plurality of users (MU), but also in a situation for a single user (SU). It is possible to use and in this case 3 DC tones can be inserted.
  • RUs of various sizes ie, 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. 5 is a diagram illustrating an arrangement of a resource unit (RU) used on a 40 MHz band.
  • RU resource unit
  • RUs of various sizes are used, and in the example of FIG. 5, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, etc. may be used.
  • 5 DC tones may be inserted into the center frequency, 12 tones are used as a guard band in the leftmost band of the 40 MHz band, and 11 tones are used in the rightmost band of the 40 MHz band. This can be used as a guard band.
  • 484-RU when used for a single user, 484-RU may be used. Meanwhile, the fact that the specific number of RUs can be changed is the same as in the example of FIG. 4 .
  • FIG. 6 is a diagram illustrating an arrangement of resource units (RUs) used on an 80 MHz band.
  • 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. may be used. have.
  • 7 DC tones may be inserted into the center frequency
  • 12 tones are used as a guard band in the leftmost band of the 80 MHz band
  • 11 tones are used in the rightmost band of the 80 MHz band. This can be used as a guard band.
  • 26-RU using 13 tones located on the left and right of the DC band can be used.
  • 996-RU when used for a single user, 996-RU may be used, and in this case, 5 DC tones may be inserted.
  • the RU described in this specification may be used for uplink (UL) communication and downlink (DL) communication.
  • a transmitting STA eg, AP
  • a 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 PPDUs are 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 A second RU (eg, 26/52/106/242-RU, etc.) may be allocated to the 2 STAs. 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 through the second RU. HE-STF, HE-LTF, and Data fields for 2 STAs may be transmitted.
  • HE-SIG-B Information on the arrangement of the RU may be signaled through HE-SIG-B.
  • the HE-SIG-B field 710 includes a common field 720 and a user-specific field 730 .
  • the common field 720 may include information commonly applied to all users (ie, user STAs) receiving SIG-B.
  • the user-individual field 730 may be referred to as a user-individual control field.
  • the user-individual field 730 may be applied only to some of the plurality of users when the SIG-B is delivered to a plurality of users.
  • the common field 720 and the user-individual field 730 may be separately encoded.
  • the common field 720 may include N*8 bits of RU allocation information.
  • the RU allocation information may include information about the location of the RU. For example, when a 20 MHz channel is used as shown in FIG. 4, the RU allocation information may include information on which RUs (26-RU/52-RU/106-RU) are disposed in which frequency band. .
  • a maximum of nine 26-RUs may be allocated to a 20 MHz channel.
  • Table 1 when the RU allocation information of the common field 720 is set to "00000000", nine 26-RUs may be allocated to a corresponding channel (ie, 20 MHz).
  • Table 1 when the RU allocation information of the common field 720 is set to "00000001”, seven 26-RUs and one 52-RU are arranged in a corresponding channel. That is, in the example of FIG. 4 , 52-RUs may be allocated to the rightmost side, and seven 26-RUs may be allocated to the left side thereof.
  • Table 1 shows only some of the RU locations that can be indicated by the RU allocation information.
  • the 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 side of a 20 MHz channel, and 5 26-RUs are allocated to the right side thereof.
  • a plurality of STAs eg, User-STAs
  • a maximum of 8 STAs eg, User-STAs
  • the number of STAs eg, User-STAs allocated to the 106-RU is 3-bit information (y2y1y0).
  • the number of STAs (eg, User-STAs) allocated to the 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 to one RU having a specific size (eg, 106 subcarriers) or more based on the MU-MIMO technique.
  • the user-individual field 730 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 of the common field 720 .
  • the RU allocation information of the common field 720 is “00000000”
  • one user STA may be allocated to each of the nine 26-RUs (that is, a total of nine user STAs are allocated). That is, a maximum of 9 user STAs may be allocated to a specific channel through the OFDMA technique.
  • up to 9 user STAs may be allocated to a specific channel through the non-MU-MIMO technique.
  • a plurality of user STAs are allocated to the 106-RU disposed on the left-most side through the MU-MIMO technique, and five 26-RUs disposed on the right side have Five user STAs may be allocated through the non-MU-MIMO technique. This case is embodied through an example of FIG. 8 .
  • FIG 8 shows an example in which a plurality of user STAs are allocated to the same RU through the MU-MIMO technique.
  • RU allocation is set to “01000010” as shown in FIG. 7, based on Table 2, 106-RU is allocated to the leftmost side of a specific channel and 5 26-RUs are allocated to the right side of the channel.
  • a total of three user STAs may be allocated to the 106-RU through the MU-MIMO technique.
  • the user-individual field 730 of HE-SIG-B may include 8 User fields.
  • Eight user fields may be included in the order shown in FIG. 8 . Also, as shown in FIG. 7 , two user fields may be implemented as one user block field.
  • the User field shown in FIGS. 7 and 8 may be configured based on two formats. That is, the user field related to the MU-MIMO technique may be configured in the first format, and the user field related to the non-MU-MIMO technique may be configured in the 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 technique) may be configured as follows.
  • the first bit (eg, B0-B10) in the user field is identification information of the user STA to which the corresponding user field is allocated (eg, STA-ID, partial AID, etc.) may include.
  • the second bit (eg, B11-B14) in the user field may include information about spatial configuration.
  • examples of the second bits may be as shown in Tables 3 to 4 below.
  • information about the number of spatial streams for a user STA may consist of 4 bits.
  • information on the number of spatial streams (ie, second bits, B11-B14) for a user STA may support up to 8 spatial streams.
  • information on the number of spatial streams (ie, the second bit, B11-B14) may support up to four spatial streams for one user STA.
  • the third bit (ie, B15-18) in the user field (ie, 21 bits) may include modulation and coding scheme (MCS) information.
  • MCS modulation and coding scheme
  • the MCS information may be applied to a data field in the PPDU including the corresponding SIG-B.
  • MCS MCS information
  • MCS index MCS field, etc. used in this specification may be indicated by a specific index value.
  • MCS information may be indicated by index 0 to index 11.
  • MCS information includes information about a constellation modulation type (eg, BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, etc.), and a coding rate (eg, 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.
  • a fifth bit (ie, B20) in the user field may include information about a 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.
  • a coding type eg, BCC or LDPC
  • the above-described example relates to the User Field of the first format (the format of the MU-MIMO technique).
  • An example of the user field of the second format (the format of the non-MU-MIMO technique) 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 about 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 a beamforming steering matrix is applied.
  • a fourth bit (eg, B15-B18) in the user field of the second format may include modulation and coding scheme (MCS) information.
  • a fifth bit (eg, B19) in the user field of the second format may include information on whether Dual Carrier Modulation (DCM) is applied.
  • the sixth bit (ie, B20) in the user field of the second format may include information about a coding type (eg, BCC or LDPC).
  • the transmitting STA may perform channel access through contending (ie, backoff operation) and transmit a trigger frame 930 . That is, the transmitting STA (eg, AP) may transmit the PPDU including the Trigger Frame 930 .
  • a PPDU including a trigger frame is received, a TB (trigger-based) PPDU is transmitted after a delay of SIFS.
  • the TB PPDUs 941 and 942 are transmitted in the same time zone, and may be transmitted from a plurality of STAs (eg, user STAs) whose AIDs are indicated in the trigger frame 930 .
  • the ACK frame 950 for the TB PPDU may be implemented in various forms.
  • FIG. 10 shows an example of a channel used/supported/defined in the 2.4 GHz band.
  • the 2.4 GHz band may be referred to as another name such as a first band (band). Also, the 2.4 GHz band may mean a frequency region in which channels having a center frequency adjacent to 2.4 GHz (eg, channels having a center frequency 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 indices (eg, indices 1 to 14).
  • a center frequency of a 20 MHz channel to which channel index 1 is allocated may be 2.412 GHz
  • a center frequency of a 20 MHz channel to which channel index 2 is allocated may be 2.417 GHz
  • 20 MHz to which channel index N is allocated may be allocated.
  • 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 a channel number. Specific values of the channel index and the center frequency may be changed.
  • the illustrated first frequency region 1010 to fourth frequency region 1040 may each include one channel.
  • the first frequency domain 1010 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 1020 may include channel 6 .
  • the center frequency of channel 6 may be set to 2437 MHz.
  • the third frequency domain 1030 may include channel 11 .
  • the center frequency of channel 11 may be set to 2462 MHz.
  • the fourth frequency domain 1040 may include channel 14. In this case, the center frequency of channel 14 may be set to 2484 MHz.
  • FIG. 11 shows an example of a channel used/supported/defined within the 5 GHz band.
  • the 5 GHz band may be referred to as another name such as a second band/band.
  • the 5 GHz band may mean a frequency region 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 numerical values shown in FIG. 11 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 may be referred to as UNII Low.
  • UNII-2 may contain frequency domains called UNII Mid and UNII-2Extended.
  • UNII-3 may be referred to as UNII-Upper.
  • a plurality of channels may be set in the 5 GHz band, and the bandwidth of each channel may be variously set to 20 MHz, 40 MHz, 80 MHz, or 160 MHz.
  • the 5170 MHz to 5330 MHz frequency region/range in UNII-1 and UNII-2 may be divided into eight 20 MHz channels.
  • the 5170 MHz to 5330 MHz frequency domain/range may be divided into 4 channels through the 40 MHz frequency domain.
  • the 5170 MHz to 5330 MHz frequency domain/range may 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.
  • the 6 GHz band may be referred to as another name such as a third band/band.
  • the 6 GHz band may mean a frequency region in which channels having a center frequency of 5.9 GHz or higher are used/supported/defined.
  • the specific numerical values shown in FIG. 12 may be changed.
  • the 20 MHz channel of FIG. 12 may be defined from 5.940 GHz.
  • the leftmost channel among the 20 MHz channels of FIG. 12 may have an index 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 channel index N may be determined to be (5.940 + 0.005*N) GHz.
  • the index (or channel number) of the 20 MHz channel of FIG. 12 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, 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 of FIG. 12 is 3, 11, 19, 27, 35, 43, 51, 59, 67, 75, 83, 91, 99, 107, 115, 123, 131, 139, 147, 155, 163, 171, 179, 187, 195, 203, 211, 219, 227.
  • a 240 MHz channel or a 320 MHz channel may be additionally added.
  • FIG. 13 shows an example of a PPDU used in this specification.
  • the PPDU of FIG. 13 may be called by various names such as an EHT PPDU, a transmission PPDU, a reception PPDU, a first type or an Nth type PPDU.
  • a PPDU or an EHT PPDU may be referred to as various names such as a transmission PPDU, a reception PPDU, a first type or an Nth type PPDU.
  • the EHT PPU may be used in an EHT system and/or a new WLAN system in which the EHT system is improved.
  • the PPDU of FIG. 13 may represent some or all of the PPDU types used in the EHT system.
  • the example of FIG. 13 may be used for both a single-user (SU) mode and a multi-user (MU) mode.
  • the PPDU of FIG. 13 may be a PPDU for one receiving STA or a plurality of receiving STAs.
  • the EHT-SIG of FIG. 13 may be omitted.
  • the STA that has received the Trigger frame for UL-MU (Uplink-MU) communication may transmit a PPDU in which the EHT-SIG is omitted in the example of FIG. 13 .
  • 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 a physical layer.
  • the subcarrier spacing of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields of FIG. 13 is set to 312.5 kHz, and the subcarrier spacing of the EHT-STF, EHT-LTF, and Data fields may 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.
  • L-LTF and L-STF may be the same as the conventional fields.
  • the L-SIG field of FIG. 13 may include, for example, 24-bit bit information.
  • 24-bit information may include a 4-bit Rate field, a 1-bit Reserved bit, a 12-bit Length field, a 1-bit Parity bit, and a 6-bit Tail bit.
  • the 12-bit Length field may include information about the length or time duration of the PPDU.
  • the value of the 12-bit Length field may be determined based on the type of the PPDU. For example, when the PPDU is a non-HT, HT, VHT PPDU or an EHT PPDU, the value of the Length field may be determined as a multiple of 3.
  • the value of the Length field may be determined as "a multiple of 3 + 1" or "a multiple of 3 +2".
  • the value of the Length field may be determined as a multiple of 3
  • the value of the Length field may be "a multiple of 3 + 1" or "a multiple of 3" +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 encoding bit. BPSK modulation may be applied to 48-bit coded bits to generate 48 BPSK symbols. The transmitting STA may map 48 BPSK symbols to positions excluding pilot subcarriers ⁇ subcarrier indexes -21, -7, +7, +21 ⁇ and DC subcarriers ⁇ subcarrier index 0 ⁇ .
  • the transmitting STA may additionally map signals of ⁇ -1, -1, -1, 1 ⁇ to the subcarrier indexes ⁇ -28, -27, +27, +28 ⁇ .
  • the above signal may be used for channel estimation in the frequency domain corresponding to ⁇ -28, -27, +27, +28 ⁇ .
  • the transmitting STA may generate an RL-SIG that is generated in the same way as the L-SIG.
  • RL-SIG BPSK modulation may be applied.
  • the receiving STA may know that the received PPDU is an HE PPDU or an EHT PPDU based on the existence of the RL-SIG.
  • a U-SIG may be inserted after the RL-SIG of FIG. 13 .
  • 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 information of N bits, and may include information for identifying the type of the 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 ⁇ s.
  • Each symbol of the U-SIG may be used to transmit 26-bit information.
  • each symbol of the U-SIG may be transmitted/received based on 52 data tones and 4 pilot tones.
  • A-bit information (eg, 52 un-coded bits) may be transmitted through the U-SIG (or U-SIG field), and the first symbol of the 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 the remaining Y-bit information (eg, 26 un-coded bits) of the total A-bit information.
  • the transmitting STA may obtain 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, except for DC index 0.
  • the 52 BPSK symbols generated by the transmitting STA may be transmitted based on the remaining tones (subcarriers) excluding pilot tones -21, -7, +7, and +21 tones.
  • A-bit information (eg, 52 un-coded bits) transmitted by U-SIG includes a CRC field (eg, a 4-bit long field) and a tail field (eg, a 6-bit long field). ) may be included.
  • the CRC field and the tail field may be transmitted through the second symbol of the U-SIG.
  • the CRC field may be generated based on the remaining 16 bits except for the CRC/tail field in the 26 bits allocated to the first symbol of the U-SIG and the second symbol, and may be generated based on the conventional CRC calculation algorithm.
  • the tail field may be used to terminate the trellis of the convolutional decoder, and may be set to, for example, “000000”.
  • 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.
  • the version-independent bits may be allocated only to the first symbol of the U-SIG, or the version-independent bits may be allocated to both the first symbol and the second symbol of the U-SIG.
  • the version-independent bits and the 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 the 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 the 3-bit PHY version identifier as the first value.
  • the receiving STA may determine that the receiving PPDU is an EHT PPDU based on the PHY version identifier having the first value.
  • the version-independent bits of the U-SIG may include a 1-bit UL/DL flag field.
  • a first value of the 1-bit UL/DL flag field relates to UL communication, and a second value of the UL/DL flag field relates to DL communication.
  • the version-independent bits of the U-SIG may include information about the length of the TXOP and information about the BSS color ID.
  • EHT PPDU when the EHT PPDU is divided into various types (eg, various types such as EHT PPDU related to SU mode, EHT PPDU related to MU mode, EHT PPDU related to TB mode, EHT PPDU related to Extended Range transmission) , information on the type of the EHT PPDU may be included in the version-dependent bits of the U-SIG.
  • various types eg, various types such as EHT PPDU related to SU mode, EHT PPDU related to MU mode, EHT PPDU related to TB mode, EHT PPDU related to Extended Range transmission
  • information on the type of the EHT PPDU may be included in the version-dependent bits of the U-SIG.
  • the U-SIG is 1) a bandwidth field including information about bandwidth, 2) a field including information about an MCS technique applied to the EHT-SIG, 3) dual subcarrier modulation to the EHT-SIG (dual An indication field including information on whether subcarrier modulation, DCM) technique is applied, 4) a field including information on the number of symbols used for EHT-SIG, 5) EHT-SIG is generated over the entire band It may include a field including information on whether or not it is, 6) a field including information about the type of EHT-LTF/STF, and 7) information about a field indicating the length of the EHT-LTF and the CP length.
  • Preamble puncturing may be applied to the PPDU of FIG. 13 .
  • the preamble puncturing refers to applying puncturing to some bands (eg, the secondary 20 MHz band) among the entire bands of the PPDU. For example, when an 80 MHz PPDU is transmitted, the STA may apply puncturing to the secondary 20 MHz band among 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 the secondary 20 MHz band within the 80 MHz band. For example, when the second puncturing pattern is applied, puncturing may be applied only to any one of the 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. Puncture may be applied to at least one 20 MHz channel that is not
  • Information on preamble puncturing applied to the PPDU may be included in the U-SIG and/or the EHT-SIG.
  • the first field of the U-SIG includes information on the contiguous bandwidth of the PPDU
  • the second field of the U-SIG includes information on the preamble puncturing applied to the PPDU. have.
  • U-SIG and EHT-SIG may include information about preamble puncturing based on the following method.
  • the U-SIG may be individually configured in units of 80 MHz.
  • the corresponding PPDU may include a first U-SIG for the first 80 MHz band and a second U-SIG for the second 80 MHz band.
  • the first field of the first U-SIG includes information about the 160 MHz bandwidth
  • the second field of the first U-SIG includes information about the preamble puncturing applied to the first 80 MHz band (that is, the preamble information about the puncturing pattern).
  • the first field of the second U-SIG includes information about the 160 MHz bandwidth
  • the second field of the second U-SIG includes information about the preamble puncturing applied to the second 80 MHz band (ie, preamble puncture). information about processing patterns).
  • the EHT-SIG subsequent to the first U-SIG may include information on preamble puncturing applied to the second 80 MHz band (that is, information on the preamble puncturing pattern), and in the second U-SIG
  • the successive EHT-SIG may include information about preamble puncturing applied to the first 80 MHz band (ie, information about a preamble puncturing pattern).
  • the U-SIG and the 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 (ie, information on preamble puncturing patterns). That is, the EHT-SIG does not include information about the preamble puncturing, and only the U-SIG may include information about the preamble puncturing (ie, information about the preamble puncturing pattern).
  • the U-SIG may be configured in units of 20 MHz. For example, when an 80 MHz PPDU is configured, the U-SIG may be duplicated. That is, the same 4 U-SIGs may be included in the 80 MHz PPDU. PPDUs exceeding the 80 MHz bandwidth may include different U-SIGs.
  • the EHT-SIG of FIG. 13 may include control information for the receiving STA.
  • the EHT-SIG may be transmitted through at least one symbol, and one symbol may have a length of 4 ⁇ s.
  • Information on the number of symbols used for the EHT-SIG may be included in the U-SIG.
  • the EHT-SIG may include technical features of the HE-SIG-B described with reference to FIGS. 7 to 8 .
  • the EHT-SIG may include a common field and a user-specific field, as in the example of FIG. 7 .
  • the common field of the EHT-SIG may be omitted, and the number of user-individual fields may be determined based on the number of users.
  • the common field of the EHT-SIG and the user-individual field of the EHT-SIG may be individually coded.
  • One user block field included in the user-individual field may contain information for two users, but the last user block field included in the user-individual field is for one user. It is possible to include information.
  • the user block field may be called by various names. For example, names such as user encoding block field and user field may be used. That is, one user block field of the EHT-SIG may include a maximum of two user fields.
  • each user field may be related to MU-MIMO assignment or may be related to non-MU-MIMO assignment.
  • the common field of EHT-SIG may include a CRC bit and a Tail bit
  • the length of the CRC bit may be determined as 4 bits
  • the length of the Tail bit may be determined as 6 bits and set to '000000'. can be set.
  • the common field of the EHT-SIG may include RU allocation information.
  • the RU allocation information may refer to information about a location of an RU to which a plurality of users (ie, a plurality of receiving STAs) are allocated.
  • RU allocation information may be configured in units of 8 bits (or N bits).
  • Tables 5 to 7 is an example of 8-bit (or N-bit) information for various RU allocation. Indexes indicated in each table may be changed, some entries in Tables 5 to 7 may be omitted, and entries not indicated may be added.
  • Tables 5 to 7 relate to information about the location of an RU allocated to a 20 MHz band.
  • 'index 0' of Table 5 may be used in a situation in which nine 26-RUs are individually allocated (eg, a situation in which nine 26-RUs shown in FIG. 4 are individually allocated).
  • one 26-RU is one user (that is, on the leftmost side of the 20 MHz band) receiving STA), and one 26-RU and one 52-RU are allocated for another user (ie, receiving STA) to the right of it, and 5 26-RUs are individually allocated to the right of it.
  • one 26-RU is one user (that is, on the leftmost side of the 20 MHz band) receiving STA)
  • one 26-RU and one 52-RU are allocated for another user (ie, receiving STA) to the right of it
  • 5 26-RUs are individually allocated to the right of it.
  • a mode in which the common field of EHT-SIG is omitted may be supported.
  • the mode in which the common field of EHT-SIG is omitted may be called compressed mode.
  • a plurality of users (ie, a plurality of receiving STAs) of the EHT PPDU may decode the PPDU (eg, a data field of the PPDU) based on non-OFDMA. That is, a plurality of users of the EHT PPDU may decode a PPDU (eg, a data field of the PPDU) received through the same frequency band.
  • a plurality of users of the EHT PPDU may decode the PPDU (eg, the data field of the PPDU) based on OFDMA. That is, a plurality of users of the EHT PPDU may receive the PPDU (eg, a data field of the PPDU) through different frequency bands.
  • the EHT-SIG may 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 may be configured based on the DCM technique. For example, among the N data tones (eg, 52 data tones) allocated for the EHT-SIG, a first modulation scheme is applied to a continuous half tone, and a second modulation scheme is applied to the remaining consecutive half tones. technique can be applied. That is, the transmitting STA modulates specific control information into a first symbol based on the first modulation scheme and allocates to consecutive half tones, modulates the same control information into a second symbol based on the second modulation scheme, and modulates the remaining consecutive tones. can be allocated to half the tone. As described above, information (eg, 1-bit field) related to whether the DCM technique is applied to the EHT-SIG may be included in the U-SIG.
  • information eg, 1-bit field
  • the EHT-STF of FIG. 13 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment.
  • the EHT-LTF of FIG. 13 may be used to estimate a channel in a MIMO environment or an OFDMA environment.
  • the PPDU of FIG. 13 (ie, EHT-PPDU) may be configured based on the examples of FIGS. 4 and 5 .
  • an EHT PPDU transmitted on a 20 MHz band may be configured based on the RU of FIG. 4 . That is, the location of the RU of the EHT-STF, EHT-LTF, and data field included in the EHT PPDU may be determined as shown in FIG. 4 .
  • the EHT PPDU transmitted on the 40 MHz band may be configured based on the RU of FIG. 5 . That is, the location of the RU of the EHT-STF, EHT-LTF, and data field included in the EHT PPDU may be determined as shown in FIG. 5 .
  • 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. 5 is repeated twice instead of the RU of FIG. 6 .
  • 23 tones may be configured in the DC region. That is, the tone-plan for the 80 MHz EHT PPDU allocated based on OFDMA may have 23 DC tones.
  • 80 MHz EHT PPDU ie, non-OFDMA full bandwidth 80 MHz PPDU allocated on the basis of Non-OFDMA is configured based on 996 RUs and consists of 5 DC tones, 12 left guard tones, and 11 right guard tones. may include.
  • the tone-plan for 160/240/320 MHz may be configured in the form of repeating the pattern of FIG. 5 several times.
  • the PPDU of FIG. 13 may be determined (or identified) as an EHT PPDU based on the following method.
  • the receiving STA may determine the type of the receiving PPDU as an 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) the RL-SIG where the L-SIG of the received PPDU is repeated is detected, and 3) the L-SIG of the received PPDU is Length When a result of applying “modulo 3” to the field value is detected as “0”, the received PPDU may be determined as an EHT PPDU.
  • the receiving STA determines the type of the EHT PPDU (eg, SU/MU/Trigger-based/Extended Range type) based on bit information included in the symbols after the RL-SIG of FIG. 13 . ) can be detected.
  • the type of the EHT PPDU eg, SU/MU/Trigger-based/Extended Range type
  • the receiving STA 1) the first symbol after the L-LTF signal that is BSPK, 2) RL-SIG that is continuous to the L-SIG field and is the same as the L-SIG, 3) the result of applying “modulo 3” is “ L-SIG including a Length field set to 0”, and 4) based on the 3-bit PHY version identifier (eg, PHY version identifier having a first value) of the above-described U-SIG, receive PPDU It can be determined 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 the HE PPDU based on the following items. For example, 1) the first symbol after the L-LTF signal is BPSK, 2) RL-SIG where L-SIG is repeated is detected, 3) “modulo 3” is applied to the Length value of L-SIG. When the result is detected as “1” or “2”, the received PPDU may be determined as an HE PPDU.
  • the receiving STA may determine the type of the received PPDU as non-HT, HT, and VHT PPDU based on the following items. For example, if 1) the first symbol after the L-LTF signal is BPSK, and 2) RL-SIG in which L-SIG is repeated is not detected, the received PPDU is determined to be non-HT, HT and VHT PPDU. can
  • (transmit/receive/uplink/down) signal may be a signal transmitted/received based on the PPDU of FIG. 13 .
  • the PPDU of FIG. 13 may be used to transmit and receive various types of frames.
  • the PPDU of FIG. 13 may be used for a control frame.
  • control frame may include request to send (RTS), clear to send (CTS), Power Save-Poll (PS-Poll), BlockACKReq, BlockAck, Null Data Packet (NDP) announcement, and Trigger Frame.
  • the PPDU of FIG. 13 may be used for a management frame.
  • An example of the 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. 13 may be used for a data frame.
  • the PPDU of FIG. 13 may be used to simultaneously transmit at least two or more of a control frame, a management frame, and a data frame.
  • FIG. 14 shows a modified example of a transmitting apparatus and/or a receiving apparatus of the present specification.
  • Each device/STA of the sub-drawings (a)/(b) of FIG. 1 may be modified as shown in FIG. 14 .
  • the transceiver 630 of FIG. 14 may be the same as the transceivers 113 and 123 of FIG. 1 .
  • the transceiver 630 of FIG. 14 may include a receiver and a transmitter.
  • the processor 610 of FIG. 14 may be the same as the processors 111 and 121 of FIG. 1 . Alternatively, the processor 610 of FIG. 14 may be the same as the processing chips 114 and 124 of FIG. 1 .
  • the memory 150 of FIG. 14 may be the same as the memories 112 and 122 of FIG. 1 .
  • the memory 150 of FIG. 14 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 the result processed by the processor 610 .
  • Keypad 614 receives input to be used by processor 610 .
  • a keypad 614 may be displayed on the display 613 .
  • SIM card 615 may be an integrated circuit used to securely store an international mobile subscriber identity (IMSI) used to identify and authenticate subscribers in mobile phone devices, such as mobile phones and computers, and keys associated therewith. .
  • IMSI international mobile subscriber identity
  • the speaker 640 may output a sound related result processed by the processor 610 .
  • Microphone 641 may receive sound related input to be used by processor 610 .
  • FIG. 15 is a diagram illustrating an arrangement of resource units (RUs) used on an 80 MHz band.
  • the arrangement of resource units (RU) used in this specification may be variously changed.
  • the arrangement of resource units (RUs) used on the 80 MHz band may be variously changed.
  • the arrangement of resource units (RU) used on the 80 MHz band may be configured based on FIG. 15 instead of FIG. 6 .
  • a new frame format may be used.
  • convention Wi-Fi receivers eg, 802.11n
  • a receiver receiver supported by the EHT standard
  • Receivers according to the /ac/ax standard may also receive the EHT signal transmitted through the 2.4/5/6 GHz band.
  • the preamble of the PPDU based on the EHT standard may be set in various ways.
  • an embodiment in which a preamble of a PPDU based on the EHT standard is configured may be described.
  • a PPDU based on the EHT standard may be described as an EHT PPDU.
  • the EHT PPDU is not limited to the EHT standard.
  • the EHT PPDU may include not only the 802.11be standard (ie, the EHT standard), but also a PPDU based on a new standard obtained by improving/evolving/extending the 802.11be standard.
  • 16 shows an example of an EHT PPDU.
  • the EHT PPDU 1600 may include an L-part 1610 and an EHT-part 1620 .
  • the EHT PPDU 1600 may be configured in a format to support backward compatibility.
  • the EHT PPDU 1600 may be transmitted to a single STA (single STA) and/or multiple STAs.
  • the EHT PPDU 1600 may be an example of an EHT standard MU-PPDU.
  • EHT PPDU 1600 is a legacy STA (STA according to the 802.11n / ac / ax standard) for coexistence or backward compatibility with the EHT-part (1620) for the L-part (1610) first. It may be configured in a structure to be transmitted.
  • the L-part 1610 may include L-STF, L-LTF, and L-SIG.
  • phase rotation may be applied to the L-part 1610 .
  • the EHT part 1620 may include RL-SIG, U-SIG 1621, EHT-SIG 1622, EHT-STF, EHT-LTF and data fields. Similar to the 11ax standard, the RL-SIG may be included in the EHT part 1620 for reliability and range extension of the L-SIG. The RL-SIG may be transmitted immediately after the L-SIG, and the L-SIG may be configured to be repeated.
  • the extra sub-carriers may be configured as [-28, -27, 27, 28].
  • the extra sub-carriers may be modulated in a BPSK scheme.
  • coefficients of [-1 -1 -1 1] may be mapped to the extra subcarriers.
  • the EHT-LTF may be configured as one of 1x EHT-LTF, 2x EHT-LTF, or 4x EHT-LTF.
  • the EHT standard may support EHT-LTF for 16 spatial streams.
  • Each field in FIG. 16 may be the same as each field described in FIG. 13 .
  • the first control signal field eg. U-SIG field
  • the second control signal field eg. EHT-SIG field
  • Control information not included in the first control signal field may be referred to by various names such as overflowed information or overflow information.
  • the second control signal field (eg, EHT-SIG field) may include a common field and a user specific field.
  • Each of the common field and the user specific field may include at least one encoding block (eg, a binary convolutional code (BCC) encoding block).
  • BCC binary convolutional code
  • One encoding block may be transmitted/received through at least one symbol, and one encoding block is not necessarily transmitted through one symbol. Meanwhile, one symbol for transmitting the encoding block may have a symbol length of 4 ⁇ s.
  • the transmission/reception PPDU proposed in this specification may be used for communication for at least one user.
  • the technical features of the present specification may be applied to an MU-PPDU (eg, EHT MU PPDU) according to the 11be standard.
  • FIG 17 shows an example of the first control signal field or the U-SIG field of the present specification.
  • the first control signal field may include a version independent field 1710 and a version dependent field 1720 .
  • the version independent field 1710 may include control information that is continuously included irrespective of the wireless LAN version (eg, next-generation standards of IEEE 802.11be and 11be).
  • the version dependent field 1720 may include control information dependent on the corresponding Version (eg, IEEE 802.11be standard).
  • the version independent field 1710 may include information related to a 3-bit version identifier indicating a Wi-Fi version after 11be and 11be, a 1-bit DL/UL field BSS color, and/or TXOP duration.
  • the version dependent field 1720 may include information related to PPDU format type and/or Bandwidth, and MCS.
  • the field of FIG. 17 may be configured based on 52 data tones and 4 pilot tones for each 20 MHz band/channel.
  • the field of FIG. 17 may be modulated in the same manner as the HE-SIG-A of the conventional 11ax standard. In other words, the field of FIG. 17 may be modulated based on the BPSK 1/2 code rate.
  • the second control signal field may be divided into a common field and a user specific field, and may be encoded based on various MCS levels.
  • the Common field may include indication information related to a spatial stream used in a transmission/reception PPDU (eg, a data field) and indication information related to an RU.
  • the user specific field may include ID information used by at least one specific user (or receiving STA), MCS, and indication information related to coding.
  • the user specific field includes decoding information (eg, corresponding to the data field transmitted through at least one RU indicated by an RU allocation sub-field included in the common field). STA ID information assigned to the RU, MSC information, and/or channel coding type/rate information).
  • the above-described first control signal field or U-SIG field may be transmitted through two consecutive symbols.
  • the U-SIG field may include a first U-SIG signal transmitted through a first symbol and a second U-SIG signal transmitted through a second symbol.
  • Each of the first U-SIG signal and the second U-SIG signal may be configured based on 26-bit control information.
  • the first U-SIG signal may be configured based on 26-bit control information including B0 bits to B25 bits.
  • An example of the B0 bit to the B25 bit for the first U-SIG signal is as follows.
  • the fields (or subfields) listed in Table 8 may belong to the Version independent category.
  • bits B0 to B2 of the first U-SIG signal may include information related to the PHY version of the PPDU through 3-bit information.
  • Bits B3 to B5 of the first U-SIG signal may include information about the bandwidth of the transmission/reception PPDU through 3-bit information.
  • Bit B6 of the first U-SIG signal may include information on whether the transmission/reception PPDU is for UL communication or DL communication.
  • Bits B7 to B12 of the first U-SIG signal may include information about the BSS Color ID of the transmission/reception PPDU. The information on the BSS Color ID may be used to identify whether the transmission/reception PPDU is an intra-PPDU or an inter-PPDU.
  • Bits B13 to B19 of the first U-SIG signal may include information on the duration of the TXOP of the transmission/reception PPDU.
  • Bits B20 to B24 of the first U-SIG signal are reserved bits and may be ignored by the receiving STA.
  • Bit B25 of the first U-SIG signal is a reserved bit and may be related to termination of a reception operation of the receiving STA.
  • the second U-SIG signal may be configured based on 26-bit control information including B0 bits to B25 bits.
  • An example of the B0 bit to the B25 bit for the second U-SIG signal is as follows. Bits B0 to B15 among the fields (or subfields) listed in Table 9 may belong to the version dependent category. Bits B0 to B1 of the second U-SIG signal determine whether the transmit/receive PPDU is used for DL OFDMA communication. , whether it is used for DL MU-MIMO communication, or whether it is used for SU or NDP communication, and the like. B2 bit and B8 bit of the second U-SIG signal are reserved bits, and may be related to termination of a reception operation of the receiving STA.
  • Bits B3 to B7 of the second U-SIG signal may include information on a puncturing pattern applied to a transmission/reception PPDU.
  • Bits B9 to B10 of the second U-SIG signal may include information for an MCS technique applied to the EHT-SIG field.
  • Bits B11 to B15 of the second U-SIG signal may include information about the number of symbols used to transmit the EHT-SIG field.
  • Bits B16 to B19 of the second U-SIG signal may include a CRC field for the U-SIG field. The CRC field may be calculated based on B0 bits to B25 bits of the first U-SIG signal and B0 bits to B15 bits of the second U-SIG signal.
  • Bit B25 of the second U-SIG signal may be all set to 0 as a tail bit.
  • the second control signal field (eg, the EHT-SIG) may be divided into a common field and a user specific field.
  • the common field may include RU allocation information.
  • the user specific field may include at least one user encoding block field or a user field including information on a user (ie, a receiving STA).
  • the EHT-SIG may be transmitted through an EHT-SIG content channel composed of 20 MHz segments. That is, one EHT-SIG content channel may be transmitted through a 20 MHz sub-channel. For example, a PPDU having a bandwidth of 80 MHz or more may be transmitted through two EHT-SIG content channels.
  • the two EHT-SIG content channels may be referred to as EHT CC1 and EHT CC2.
  • EHT-SIG when a PPDU is transmitted through 160 MHz, an EHT-SIG having different information may be transmitted for each of two 80 MHz bands. EHT-SIG transmitted through any one of the 80 MHz bands may be transmitted through EHT CC1 and EHT CC2.
  • FIG. 18 may be equally applied to a high throughput (HT) system, ie, an IEEE 802.11n system, as well as a VHT/HE/EHT (ie, IEEE 802.11ac/ax/be) system.
  • HT high throughput
  • VHT/HE/EHT IEEE 802.11ac/ax/be
  • the technical features of FIG. 18 can be equally applied to the next-generation WIFI standard with various names.
  • the LTF signal of FIG. 18 includes a plurality of LTF symbols. A plurality of LTF symbols are generated based on the LTF generation sequence.
  • the LTF generation sequence may be expressed as LTF k (or LTF_k).
  • the LTF generation sequence (LTF k ) may be multiplied by the LTF mapping matrix P LTF by the transmitting STA. Since the LTF mapping matrix may include rows that are orthogonal to each other, it may be called an orthogonal matrix, or may simply be called a P matrix or a mapping matrix.
  • the orthogonal matrix P LTF may be applied to the LTF generation sequence.
  • “Application” may mean mathematical multiplication. Since the LTF generation sequence to which the P matrix is applied has orthogonality for each stream, it may be used for channel estimation (ie, channel estimation for a MIMO channel) in the receiving STA.
  • a cyclic shift delay (CSD) process for preventing unintentional beamforming is applied, and an antenna mapping matrix Q k for k subcarriers is mapped to the transmit antenna.
  • Q k serves to map the space-time stream (STS) and the transmit chain.
  • the LTF generation sequence mapped to each transmission chain may be transmitted through a transmission antenna through an Inverse Fast Fourier Transform (IFFT) or IDFT.
  • IFFT Inverse Fast Fourier Transform
  • IDFT IDFT
  • FIG. 19 is a diagram illustrating a concept of constructing an LTF symbol based on a conventional HT-LTF generation sequence.
  • the horizontal axis represents the time axis
  • the vertical axis represents the stream STS. That is, in the example of FIG. 19 , the horizontal axis may indicate the number of HTLTF symbols (eg, the number of OFDM symbols), and the vertical axis may indicate the number of supported streams.
  • the transmitting STA When the P matrix is applied to the LTF generation sequence (ie, the HTLTF generation sequence) preset by the transmitting STA (ie, when the P matrix is multiplied or applied to the LTF generation sequence according to the example of FIG. 18 ), the transmitting STA is shown in FIG. 18 / An LTF symbol as in the example of 19 may be configured.
  • the P matrix applied to FIG. 19 may be represented by P_HTLTF, and may be expressed by the following Equation.
  • an LTF symbol (training symbol) is defined in units of streams (ie, Spatial Stream or Space Time Stream), and may be transmitted for channel estimation of each spatial stream. For example, when the number of spatial streams is 1, 2, and 4, 1, 2, and 4 LTF symbols may be transmitted, respectively, but when the number of spatial streams is 3, one long training signal symbol (long training symbol) symbol) by adding 4 LTFs can be used.
  • the receiving STA may perform channel estimation through the LTF symbol. That is, when the structure of the P matrix is known in advance between the transmitting and receiving STAs, the receiving STA may perform channel estimation according to various conventional methods. In other words, if the structure of the P matrix is defined, a method of performing channel estimation through an LTF symbol to which the corresponding P matrix is applied can be easily implemented by those skilled in the art.
  • channel estimation at the receiving STA may be performed according to the following example.
  • the LTF symbol received by the receiving STA may be as shown in Equation (3).
  • Equation 4 Equation 4
  • Equation 4 if h nm is obtained for all n and m, Equation 5 is obtained.
  • the receiving STA may perform channel estimation based on the LTF symbol to which the corresponding P matrix is applied.
  • Equation 2 is an example to which the example of Equation 2 is applied, even when an orthogonal matrix of various sizes is applied instead of the example of Equation 2, it is possible for the receiving STA to obtain h nm based on the conventional algorithm.
  • the structure of the P matrix is clearly defined for convenience of description, but a description of a specific equation for performing channel estimation based on the LTF generation sequence to which the corresponding P matrix is applied will be omitted.
  • the P matrix of Equation 2 may be used for two streams.
  • the P matrix of Equation 1 may be used for three or four streams.
  • the 6-by-6 matrix of Equation 6 below may be used.
  • pi means ⁇ .
  • the 8-by-8 matrix of Equation 7 may be used.
  • the above-described 2-by-2 P matrix (eg, the matrix of Equation 2) is [1, 1; 1, -1].
  • the above-described 4-by-4 P matrix (eg, the matrix of Equation 1 or the P_4x4 matrix of Equation 6) is [1, 1, 1, 1; 1, -1, 1, -1; 1, 1, -1, -1; 1, -1, -1, 1].
  • one LTF The number of LTF symbols included in the signal may be as shown in Table 10.
  • two initial LTFs may be generated based on the P matrix of Equation 2 (ie, a 2-by-2 matrix).
  • four initial LTFs may be generated based on the P matrix of Equation 1 (ie, a 4-by-4 matrix).
  • 6 Initial LTFs may be generated based on the P matrix of Equation 6 (ie, a 6-by-6 matrix).
  • 8 Initial LTFs may be generated based on the P matrix of Equation 7 (ie, an 8-by-8 matrix).
  • the LTF signal of the present specification may additionally include an Extra LTF symbol as well as the aforementioned Initial LTF symbol.
  • the Initial LTF symbol may be generated based on a multiplication between a) a preset LTF generation sequence and b) a conventional P matrix (eg, P matrix of Equations 1, 2, 6, and 7). As shown in Table 10, the total number of initial LTF symbols is equal to the total number of spatial streams (Total N_ss) configured in the transmitting STA, or is set to be larger than the total number of spatial streams (Total N_ss) by '1'.
  • the Initial LTF symbol may be called by various names (eg, Initial EHT LTF symbol, first type LTF symbol, etc.).
  • the Extra LTF symbol may mean an LTF symbol consecutive to the Initial LTF symbol. That is, one LTF signal may be composed of the Initial LTF symbol and the Extra LTF symbol. That is, the total number of LTF symbols included in the LTF signal of the present specification may be equal to the sum of the total number of the Initial LTF symbols and the total number of the Extra LTF symbols.
  • the Extra LTF symbol may be called by various names (eg, Extra EHT LTF symbol, second type LTF symbol, etc.).
  • the 11be standard In the IEEE 802.11be standard (ie, the 11be standard), a maximum of 16 LTF symbols may be supported. That is, the 11be standard may use an increased number of LTF symbols, and accordingly, the 11be standard may include an LTF signal (ie, an EHT LTF signal) composed of an Initial LTF symbol and an Extra LTF symbol proposed in this specification. .
  • an LTF signal ie, an EHT LTF signal
  • a maximum of 16 spatial streams may be supported, and an STA may receive up to 16 LTF symbols.
  • information on whether the STA supports up to 16 spatial streams and/or up to 16 LTF symbols may be included in PHY capability (information).
  • the PHY capability (information) may be included in the EHT PHY Capabilities Information.
  • the EHT PHY Capabilities Information may be included in the EHT Capabilities element.
  • the EHT Capabilities element of FIG. 20 may be included in the Management frame.
  • Examples of the management frame may be a Beacon frame, a Probe Response frame, a (Re)Association Request frame, and a (Re)Association Response frame.
  • the EHT PHY Capabilities Information may include a total of 64 bits of information consisting of B0 bits to B63 bits. For example, information on whether the STA supports up to 16 spatial streams and/or up to 16 LTF symbols may be indicated by 5-bit information in EHT PHY Capabilities Information, and the 5-bit information is B46 bits to It may consist of B50 bits.
  • the maximum number of supportable spatial streams (N_SS) per STA may be “4”. Accordingly, the maximum number of streams for MU-MIMO may be set to 16, and accordingly, a maximum of 16 LTF symbols may be used through MU-MIMO communication.
  • the STA of the present specification may transmit and receive signals using a plurality of SSs.
  • the transmission STA may use an increased number of LTF symbols. That is, the transmitting STA preferably includes an Extra LTF symbol as well as an Initial LTF symbol in one LTF signal.
  • the number of Extra LTF symbols may not exceed the number of Initial LTF symbols. This is because, when the number of Extra LTF symbols is excessively increased, the time required for the LTF signal becomes excessively long and overhead may occur.
  • Table 11 shows the total number of spatial streams (Total N_ss) and the number of Initial/Extra LTF symbols configured by the transmitting STA. For example, when the total number of spatial streams (Total N_ss) is determined to be 3, the number of Initial LTF symbols (Initial N_LTF) is fixed to 4 as shown in Table 10, and the number of Extra LTF symbols (Extra N_LTF) may be determined as 1, 2, 3, or 4. Accordingly, the total number of LTF symbols included in one LTF signal (Total N_LTF) may be determined to be 5, 6, 7, or 8.
  • the maximum value of the total number of LTF symbols (Total N_LTF) included in the LTF signal of the present specification may be 2, 4, 8, 12, or 16 according to the number of streams.
  • the Extra LTF symbol of the present specification may be used for MU-MIMO transmission.
  • the maximum number of spatial streams (Max N_ss) that can be supported by the STA may be “4”. Accordingly, when MU-MIMO transmission is performed, only the case where extra N_LTF is 1, 2, 3, or 4 in Table 11 may be considered. Therefore, when the extra LTF for MU-MIMO transmission is used, the maximum value of the total number of LTF symbols (Total N_LTF) according to each N_SS may be 2, 4, or 8.
  • the number of Extra LTF symbols in the present specification may be variously set as shown in Table 11.
  • the Extra LTF symbol When the Extra LTF symbol is included, the total number of LTF symbols included in one LTF signal increases. That is, in response to a specific number of streams, a larger number of LTF symbols than in Table 10 are included in one LTF signal.
  • the total number of LTF symbols included in one LTF signal may be expressed as “TN_LTF”, and the number of Initial LTF symbols included in one LTF signal may be expressed as “IN_LTF”, and the number of LTF symbols included in one LTF signal may be expressed as “IN_LTF”.
  • the number of Extra LTF symbols may be indicated as “EN_LTF”.
  • the IN_LTF may be determined as shown in Table 10 according to the number of corresponding spatial streams (N_SS).
  • the number of rows of the P matrix for the LTF signal may correspond to the number of spatial streams related to the P matrix, and the number of columns of the P matrix
  • the number may correspond to the number of LTF symbols generated through the P matrix.
  • an EHT LTF symbol may be generated by multiplying a preset EHT LTF sequence by at least a part of the P matrix (ie, all or part of the P matrix).
  • the number of rows of the P matrix multiplied by the EHT LTF sequence may be equal to the number of spatial streams related to the P matrix.
  • the number of columns of the P matrix multiplied by the EHT LTF sequence may be the same as the number of generated EHT LTF symbols.
  • the number of columns of the P matrix used in the following example may be set based on TN_LTF.
  • the number of columns of the P matrix may be equal to TN_LTF.
  • 21 is a diagram illustrating an example in which a P matrix corresponding to TN_LTF is used.
  • TN_LTF is IN_LTF + EN_LTF
  • a P matrix corresponding to the TN_LTF may be used.
  • P Matrix_A the number of columns of the matrix of FIG. 21 may be the same as TN_LTF.
  • the number of columns of the P matrix multiplied by the LTF sequence may be equal to TN_LTF.
  • the P matrix (P Matrix_A) of FIG. 21 is determined based on the number of generated LTF symbols (ie, TN_LTF)
  • the P matrix (P Matrix_A) of FIG. 21 is the number of spatial streams (N_ss) or It may be determined regardless of IN_LTF. That is, the number of rows of the conventional P matrix is related to the number of spatial streams (N_ss), but the number of rows of the P matrix (P Matrix_A) of FIG. 21 is independent of the number of spatial streams (N_ss) can do.
  • TN_LTF the maximum value of TN_LTF is assumed to be 8, but the technical features of the present specification are not limited thereto. That is, it is possible to apply the following technical characteristics to various values (TN_LTF).
  • TN_LTF may be set to “2”.
  • a preset LTF sequence eg, VHT/HE/EHT LTF sequence
  • a 2-by-2 P matrix or a 2-by-2 part in a 4-by-4 P matrix.
  • the 2-by-2 P matrix may be the matrix of Equation 2
  • the 4-by-4 P matrix may be the matrix of Equation 1 above.
  • TN_LTF may be set to “4”.
  • a 4-by-4 P matrix may be multiplied by a preset LTF sequence (eg, VHT/HE/EHT LTF sequence).
  • the 4-by-4 P matrix may be the matrix of Equation 1 above.
  • TN_LTF may be set to “3”.
  • the matrix P Matrix_A of FIG. 21 may be configured as a 4-by-4 P matrix.
  • N_ss the number of related spatial streams
  • EN_LTF 1
  • the P matrix multiplied by the preset LTF sequence may be a 2-by-3 matrix/component among 4-by-4 P matrices.
  • TN_LTF may be set to “8”.
  • an 8-by-8 P matrix may be multiplied by a preset LTF sequence (eg, VHT/HE/EHT LTF sequence).
  • the 8-by-8 P matrix may be the matrix of Equation 7 above.
  • TN_LTF may be set to “7”.
  • the matrix P Matrix_A of FIG. 21 may be configured as an 8-by-8 P matrix.
  • N_ss the number of related spatial streams
  • IN_LTF 4
  • at least a part of the P matrix multiplied by the preset LTF sequence may be a 4-by-7 matrix/component among the 8-by-8 P matrix.
  • TN_LTF may be set to “5” or “6”.
  • the matrix P Matrix_A of FIG. 21 may be configured as an 8-by-8 P matrix.
  • the preset LTF sequence (eg, VHT/HE/EHT LTF sequence) is not an 8-by-8 P matrix but a 6-by-6
  • the P matrix can be multiplied.
  • the 6-by-6 P matrix may be the matrix of Equation (6).
  • the number of rows of the P matrix used in the following example may be set based on the total number of spatial streams (Total N_SS) and/or IN_LTF.
  • the number of rows of the P matrix may be equal to the total number of spatial streams (Total N_SS) and/or IN_LTF.
  • the matrix P Matrix_B of FIG. 22 may be composed of two P matrices as shown, and may be composed of the same two P matrices or two different P matrices.
  • the P matrix of FIG. 22 may be determined by the allocated N_SS or Total N_SS.
  • the IN_LTF may be determined based on the allocated N_SS or Total N_SS, for example, based on Table 11 above.
  • the P matrix of FIG. 22 may be constructed based on the total number of spatial streams (Total N_SS) and/or IN_LTF.
  • the number of rows of the P matrix P Matrix_B of FIG. 22 may be determined based on Total N_SS.
  • the number of rows of the P matrix P Matrix_B of FIG. 22 may be determined based on IN_LTF.
  • the number of rows of the P matrix P Matrix_B of FIG. 22 may be equal to Total N_SS.
  • an Initial LTF symbol may be generated through the left P matrix of FIG. 22
  • an Extra LTF symbol may be generated through the right P matrix of FIG. 22
  • the number of columns of the left P matrix of FIG. 22 multiplied by a preset LTF sequence (eg, VHT/HE/EHT LTF sequence) may be the same as the number of Initial LTF symbols.
  • the number of columns of the right P matrix of FIG. 22 multiplied by the preset LTF sequence may be the same as the number of Extra LTF symbols.
  • TN_LTF may be set to “2”.
  • a 1-by-1 matrix/component is multiplied by a preset LTF sequence (eg, a VHT/HE/EHT LTF sequence) from a 2-by-2 P matrix (or a 4-by-4 P matrix).
  • a preset LTF sequence eg, a VHT/HE/EHT LTF sequence
  • 2-by-2 P matrix or a 4-by-4 P matrix
  • an Initial LTF symbol may be generated
  • an Extra LTF symbol may be generated in the same way.
  • the 2-by-2 P matrix may be the matrix of Equation 2
  • the 4-by-4 P matrix may be the matrix of Equation 1 above.
  • TN_LTF may be set to “4”.
  • the preset LTF sequence eg, VHT/HE/EHT LTF sequence
  • the 2-by-2 P matrix or the 2-by-2 matrix/component among the 4-by-4 P matrix.
  • the 2-by-2 P matrix may be the matrix of Equation 2
  • the 4-by-4 P matrix may be the matrix of Equation 1 above.
  • the left P matrix of FIG. 22 is composed of a 2-by-2 P matrix (or a 2-by-2 matrix/component of a 4-by-4 P matrix), and the corresponding 2-by-2 P matrix (or 4-by-4 P matrix).
  • Two Initial LTF symbols may be generated based on a 2-by-2 matrix/component) among the by-4 P matrix.
  • the right P matrix of FIG. 22 is composed of the same matrix as the left P matrix, and two Extra LTF symbols may be generated based on the matrix.
  • TN_LTF may be set to “3”.
  • the matrix P Matrix_B of FIG. 22 may be configured as a 2-by-2 P matrix.
  • N_ss the number of related spatial streams
  • EN_LTF 1
  • the entire 2-by-2 P matrix may be used in the left matrix of FIG. 22 used for the Initial LTF symbol (that is, the preset LTF sequence may be multiplied by all the 2-by-2 P matrices) have).
  • the 2-by-2 P matrix may be configured as the left matrix of FIG. 22 .
  • a part of the 2-by-2 P matrix may be used for the right matrix of FIG. 22 used for the Extra LTF symbol. That is, as the P matrix for the Extra LTF symbol, a 1-by-1 matrix/component of the 2-by-2 P matrix may be used (that is, 1-by- of the 2-by-2 P matrix in the preset LTF sequence). 1 matrix/component can be multiplied).
  • TN_LTF may be set to “8”.
  • an 8-by-8 P matrix may be multiplied by a preset LTF sequence (eg, VHT/HE/EHT LTF sequence).
  • the 8-by-8 P matrix may be the matrix of Equation 7 above.
  • TN_LTF may be set to “7”.
  • both the left matrix of FIG. 22 and the right matrix of FIG. 22 may be configured as a 4-by-4 P matrix.
  • N_ss the number of related spatial streams
  • the P matrix for the Initial LTF symbol ie, the left matrix of FIG. 22
  • the P matrix for the Extra LTF symbol ie, the right matrix of FIG. 22
  • the P matrix for the Extra LTF symbol may be at least a part of the P matrix (ie, the left matrix of FIG.
  • a 4-by-3 matrix/component among the 4-by-4 P matrix may be used (ie, 4-by-3 matrix/component in the preset LTF sequence). It can be multiplied by a 4-by-3 matrix/component of a by-4 P matrix).
  • TN_LTF may be set to “6”.
  • N_ss the number of related spatial streams
  • EN_LTF 2.
  • the P matrix for the Initial LTF symbol ie, the left matrix of FIG. 22
  • the P matrix for the Extra LTF symbol ie, the P matrix in FIG. 22) 22
  • a 4-by-2 matrix/component among the 4-by-4 P matrix may be used for LTF generation.
  • the PPDU of the present specification may include a plurality of Initial LTF symbols in one LTF signal and a plurality of Extra LTF symbols consecutive to the plurality of Initial LTF symbols.
  • the transmitting STA may transmit information on the Extra LTF symbol to the receiving STA.
  • the information on the Extra LTF symbol includes first information on whether the Extra LTF symbol is included in the transmission signal/PPDU, and/or the total number of the Extra LTF symbols (or the Initial LTF symbol and the Extra (total sum of LTF symbols) may include second information.
  • the first information may consist of 1-bit information/subfield.
  • the first information may be included in, for example, the first control signal field (eg, U-SIG field).
  • the first information may be located in some of the various fields shown in Table 8/9, for example, a bit set as a validate bit or a disregard bit.
  • the first information may include any one of B20 to B24 bits of the first U-SIG signal (ie, U-SIG 1 symbol) shown in Table 8 and/or the first information shown in Table 8.
  • 1 U-SIG signal ie, U-SIG 1 symbol
  • the first information may be included in the second control signal field (eg, EHT-SIG field).
  • the first information may be configured through any one of bits B13 to B16 bits, which are disregard bits included in the common field of the second control signal field (eg, EHT-SIG field).
  • the first information may be configured through B15 included in a user field of a user specific field of the second control signal field (eg, EHT-SIG field).
  • the second information may be composed of N-bit information/subfield (eg, 3 or 4-bit field).
  • the second information may be included in the first control signal field (eg, U-SIG field) or the second second control signal field (eg, EHT-SIG field).
  • the second information may be included in the Number Of EHT-LTF Symbols field located in bits B6 to B8 of the common field of the second control signal field (eg, EHT-SIG field).
  • the second information may be included in 3 bits (or 4 bits) among bits B16 to B19 of the user field of the second control signal field (eg, EHT-SIG field).
  • FIG. 23 is a flowchart illustrating an operation performed by a transmitting STA.
  • the operation of FIG. 23 may be performed by an AP STA or a non-AP STA. That is, the operation of FIG. 23 may be applied to downlink or uplink.
  • the transmitting STA may configure a Long Training Field (LTF) signal for channel estimation.
  • LTF Long Training Field
  • An example of the LTF signal may be the EHT-LTF shown in FIG. 16 . That is, the LTF signal may be located between the STF signal and the data signal (ie, the data field including the PSDU).
  • the LTF signal may include a plurality of consecutive LTF symbols.
  • the plurality of consecutive LTF symbols may include an initial LTF symbol and an extra LTF symbol. In other words, the LTF signal may be transmitted through an initial LTF symbol and an extra LTF symbol.
  • the number of initial LTF symbols may be determined based on the number of spatial streams configured by the transmitting STA. In other words, the number of initial LTF symbols may be determined based on the total number of spatial streams (Total N_ss) based on Table 10. In other words, the number of the initial LTF symbols is the same as the number of spatial streams or as large as "1" compared to the number of spatial streams, as shown in Table 10 above. .
  • the number of the extra LTF symbols may be variously set based on the number of the initial LTF symbols.
  • the number of extra LTF symbols may be determined as shown in Table 11 above.
  • the number of extra LTF symbols may be the same as the number of initial LTF symbols.
  • the number of extra LTF symbols may be different from the number of initial LTF symbols.
  • a method for generating the initial LTF and extra LTF symbols may be determined in various ways.
  • the initial LTF and extra LTF symbols may be generated based on the technical feature of FIG. 21 or the technical feature of FIG. 22 .
  • the initial LTF symbol is an LTF sequence (eg, a preset HT/VHT/HE/EHT LTF sequence) and It may be configured based on multiplication of at least a portion of the P matrix (eg, the P matrix of Equations 1, 2, 6, and 7).
  • the P matrix applied to the LTF sequence may be all of the P matrix or a part of the P matrix (ie, a specific row/column).
  • at least a part of the P matrix may be all or a part of the left matrix P Matrix_B of FIG. 22 .
  • the extra LTF symbol is the LTF sequence (eg, a preset HT/VHT/HE/EHT LTF sequence) and the P matrix, for example, mathematical It may be constructed based on the product of at least a part of the P matrix of Equations 1, 2, 6, and 7).
  • the P matrix for the extra LTF symbol may be the same as the P matrix for the initial LTF symbol.
  • the P matrix for the extra LTF symbol may be the right matrix (P Matrix_B) of FIG. 22 .
  • the P matrix applied for the extra LTF symbol may be all or a part of the right matrix P Matrix_B of FIG. 22 .
  • a transmission physical protocol data unit (PPDU) including the long training field (LTF) signal may be transmitted to at least one receiving STA.
  • the transmission PPDU may be the EHT PPDU shown in FIG. 16 or a PPDU defined according to the next-generation WLAN standard newly defined after the IEEE 802.11be standard.
  • the transmission PPDU is a legacy signal (L-SIG) field, a first control signal field including control information for interpretation of the transmission PPDU, and the first control signal field is continuous and a second control signal field.
  • the first control signal field may be the U-SIG field
  • the second control signal field may be an EHT-SIG field.
  • the second control signal field may include a common field and a user specific field.
  • the first control signal field or the second control signal field may include a subfield related to the extra LTF symbol.
  • the subfield regarding the extra LTF symbol may include first control information regarding whether the extra LTF symbol is included in the LTF signal, and/or the extra included in the LTF signal. (extra) may include second control information regarding the number of LTF symbols.
  • FIG. 24 is a flowchart illustrating an operation performed by a receiving STA.
  • the operation of FIG. 24 may be performed by an AP STA or a non-AP STA. That is, the operation of FIG. 24 may be applied to downlink or uplink.
  • the receiving STA may receive the receiving PPDU including the LTF signal from the transmitting STA.
  • the technical features applied to the received PPDU may be the same as those of the transmit PPDU of FIG. 23 . That is, the LTF signal may be received through an initial LTF symbol and an extra LTF symbol.
  • the number of initial LTF symbols may be determined based on the number of spatial streams for the received PPDU.
  • the number of the extra (extra) LTF symbols may be variously set, for example, may be determined based on the private interest table 11.
  • the technical features applied to the received PPDU may be the same as those applied in step S2310.
  • the receiving STA may decode the received PPDU.
  • the receiving STA may use a data field (eg, included in the data field) of the received PPDU based on the legacy signal field, the first control signal field, and/or the second control signal field included in the received PPDU. Resource Unit) can be decoded.
  • channel estimation may be performed based on the LTF signal of the received PPDU. The channel estimation may be performed based on the initial LTF symbol and the extra LTF symbol.
  • FIGS. 23 to 24 may be performed by the apparatus of FIGS. 1 and/or 14 .
  • the transmitting STA of FIG. 23 or the receiving STA of FIG. 24 may be implemented with the apparatus of FIGS. 1 and/or 14 .
  • the processor of FIGS. 1 and/or 14 may perform each of the operations of FIGS. 23 to 24 described above.
  • the transceiver of FIGS. 1 and/or 14 may perform each operation described in FIGS. 23 to 24 .
  • the apparatus proposed in this specification does not necessarily include a transceiver, and may be implemented in the form of a chip including a processor and a memory. Such a device may generate/store the transmit/receive PPDU according to the above-described example. Such a device may be connected to a separately manufactured transceiver to support actual transmission and reception.
  • a computer readable medium may be encoded with at least one computer program including instructions.
  • the instructions stored in the medium may control the processor described in FIGS. 1 and/or 14 . That is, the instructions stored in the medium control the processor presented herein to perform the above-described operations of the transmitting and receiving STAs (eg, FIGS. 23 to 24 ).
  • Machine learning refers to a field that defines various problems dealt with in the field of artificial intelligence and studies methodologies to solve them. do.
  • Machine learning is also defined as an algorithm that improves the performance of a certain task through continuous experience.
  • An artificial neural network is a model used in machine learning, and may refer to an overall model having problem-solving ability, which is composed of artificial neurons (nodes) that form a network by combining synapses.
  • An artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process that updates model parameters, and an activation function that generates 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 the artificial neural network, each neuron may output a function value of an activation function for input signals, weights, and biases input through synapses.
  • Model parameters refer to parameters determined through learning, and include the weight of synaptic connections and the bias of neurons.
  • the hyperparameter refers to a parameter to be set before learning in a machine learning algorithm, and includes a learning rate, the number of iterations, a mini-batch size, an initialization function, and the like.
  • the purpose of learning the artificial neural network can be seen as determining the model parameters that minimize the loss function.
  • the loss function may be used as an index for determining optimal model parameters in the learning process of the artificial neural network.
  • Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning according to a learning method.
  • Supervised learning refers to a method of training an artificial neural network in a state in which a label for the training data is given, and the label is the correct answer (or result value) that the artificial neural network must infer when the training data is input to the artificial neural network.
  • Unsupervised learning may refer to a method of training an artificial neural network in a state where no labels are given for training data.
  • Reinforcement learning can refer to a learning method in which an agent defined in an environment learns to select an action or sequence of actions that maximizes the cumulative reward in each state.
  • machine learning implemented as a deep neural network (DNN) including a plurality of hidden layers is also called deep learning (deep learning), and deep learning is a part of machine learning.
  • DNN deep neural network
  • deep learning deep learning
  • machine learning is used in a sense including deep learning.
  • a robot can mean a machine that automatically handles or operates a task given by its own capabilities.
  • a robot having a function of recognizing an environment and performing an operation by self-judgment may be referred to as an intelligent robot.
  • Robots can be classified into industrial, medical, home, 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 the robot joints.
  • the movable robot includes a wheel, a brake, a propeller, and the like in the driving unit, and can travel on the ground or fly in the air through the driving unit.
  • the extended reality is a generic term for virtual reality (VR), augmented reality (AR), and mixed reality (MR).
  • VR technology provides only CG images of objects or backgrounds in the real world
  • AR technology provides virtual CG images on top of images of real objects
  • MR technology is a computer that mixes and combines virtual objects in the real world. graphic technology.
  • MR technology is similar to AR technology in that it shows both real and virtual objects. However, there is a difference in that in AR technology, virtual objects are used in a form that complements real objects, whereas in MR technology, virtual objects and real objects are used with equal characteristics.
  • HMD Head-Mount Display
  • HUD Head-Up Display
  • mobile phone tablet PC, laptop, desktop, TV, digital signage, etc.

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Abstract

La présente spécification propose une caractéristique technique relative à un champ d'entraînement long (LTF) d'un système de réseau local sans fil. Un signal LTF basé sur la présente spécification peut comprendre une pluralité de symboles LTF consécutifs, la pluralité de symboles LTF pouvant comprendre un symbole LTF initial et un symbole LTF supplémentaire. Le symbole LTF initial et le symbole LTF supplémentaire peuvent être générés par multiplication d'une séquence LTF préconfigurée et d'une matrice orthogonale. La matrice orthogonale de la présente spécification peut être configurée de diverses manières en fonction du nombre de symboles LTF. Par exemple, le nombre de rangées ou de colonnes de la matrice orthogonale de la présente spécification peut être configuré sur la base du nombre total de symboles LTF inclus dans un signal LTF ou le nombre de symboles LTF initiaux ou de symboles LTF supplémentaires.
PCT/KR2022/001583 2021-02-05 2022-01-28 Technique de transmission d'un signal d'entraînement long dans un système de réseau local sans fil WO2022169222A1 (fr)

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