WO2020032641A1 - Procédé et appareil pour recevoir des informations concernant un flux spatial dans un système wlan - Google Patents

Procédé et appareil pour recevoir des informations concernant un flux spatial dans un système wlan Download PDF

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Publication number
WO2020032641A1
WO2020032641A1 PCT/KR2019/010002 KR2019010002W WO2020032641A1 WO 2020032641 A1 WO2020032641 A1 WO 2020032641A1 KR 2019010002 W KR2019010002 W KR 2019010002W WO 2020032641 A1 WO2020032641 A1 WO 2020032641A1
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user
information
field
nsts
sta
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PCT/KR2019/010002
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English (en)
Korean (ko)
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임동국
박은성
윤선웅
최진수
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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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present disclosure relates to a technique for transmitting and receiving data in wireless communication, and more particularly, to a method and apparatus for transmitting and receiving information related to a spatial stream in a wireless LAN system.
  • Wireless local area networks have been improved in many ways.
  • the IEEE 802.11ax standard proposed an improved communication environment using orthogonal frequency division multiple access (OFDMA) and downlink multi-user multiple input (MIMO) techniques.
  • OFDMA orthogonal frequency division multiple access
  • MIMO downlink multi-user multiple input
  • the present specification improves the existing IEEE 802.11ax standard or proposes technical features that can be utilized in a new communication standard.
  • the new communication standard may be an Extreme High Throughput (ETH) specification that is recently discussed.
  • ETH Extreme High Throughput
  • the EHT specification may use a newly proposed increased bandwidth, an improved PHY protocol data unit (PPDU) structure, an improved sequence, a hybrid automatic repeat request (HARQ) technique, and the like.
  • PPDU PHY protocol data unit
  • HARQ hybrid automatic repeat request
  • an increased number of spatial streams may be used.
  • the signaling scheme in the WLAN system may need to be improved to properly use the increased number of spatial streams.
  • a technique for signaling an increased number of spatial streams should be proposed.
  • a total of eight spatial streams may be used when the MU-MIMO technique is used.
  • the MU-MIMO scheme is applied to several User STAs, up to four spatial streams may be applied to one User STA.
  • One example according to the present disclosure relates to a method and / or apparatus for receiving a signal in a wireless local area network (WLAN) system.
  • WLAN wireless local area network
  • One example of the present specification includes receiving, by a user STA, a signal including a user-specific control field for multi-user (MU) communication.
  • the user-specific control field may include a first information field regarding the number of spatial streams for the user STA and a size of the first information field. It may include a second information field including information about.
  • One example of the present specification includes decoding, by the user STA, a data field based on the user-individual control field.
  • An example according to the present specification proposes a technique in which a user STA and / or an AP may use an increased spatial stream even when the number of spatial streams increases.
  • one example herein proposes an improved technique for signaling information about the capability of the spatial stream supported by the User STA and / or AP. This enables efficient communication considering the capabilities of the User STA and / or AP.
  • an example of the present specification proposes an improved signaling scheme when the number of spatial streams increases in a new WLAN standard. Through this, the user STA can accurately obtain the number of spatial streams allocated to the user STA.
  • an example of the present specification efficiently provides information about a spatial stream allocated to a user STA by using a control field in a situation where a STA supporting a new WLAN standard and a legacy STA are mixed.
  • the WLAN system can support increased throughput, and each STA can perform data communication according to a more efficient technique.
  • 1 is a conceptual diagram illustrating a structure of a WLAN.
  • FIG. 2 is a diagram illustrating a general link setup process.
  • 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 resource units (RUs) used on a 20 MHz band.
  • FIG. 5 is a diagram illustrating an arrangement of resource units (RUs) used on a 40 MHz band.
  • FIG. 6 is a diagram illustrating an arrangement of resource units (RUs) used on an 80 MHz band.
  • FIG. 7 is a diagram illustrating another example of the HE-PPDU.
  • FIG. 8 is a diagram for explaining an example of a frame structure used in an IEEE 802.11 system.
  • FIG. 10 shows an example in which a plurality of User STAs are allocated to the same RU through the MU-MIMO technique.
  • 11 is an example of a field signaling capability information related to a spatial stream.
  • 12 is an example of a field that conveys information about the highest MCS index associated with up to 16 spatial streams.
  • 13 is an example of a PPDU as used herein.
  • FIG. 14 is a flowchart of a first procedure according to an example of the present specification.
  • 15 is a second procedure flowchart according to an example of the present specification.
  • FIG. 16 illustrates a transmitting STA or a receiving STA to which an example of the present specification is applied.
  • FIG. 17 shows another example of a detailed block diagram of a transceiver.
  • the slash (/) or comma (comma) may mean “and / or”.
  • “A / B” means “A and / or B” and may mean “only A”, “only B” or “A and B”.
  • technical features that are separately described in one drawing may be implemented separately or may be simultaneously implemented.
  • parentheses used herein may mean “for example”. Specifically, when it is displayed as “control information (EHT-Signal)”, “EHT-Signal” may be proposed as an example of “control information”. In addition, even when displayed as “control information (ie, EHT-signal)”, “EHT-signal” may be proposed as an example of “control information”.
  • the following example of the present specification can be applied to various wireless communication systems.
  • the following example of the present specification may be applied to a wireless local area network (WLAN) system.
  • 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 the newly proposed EHT standard or the IEEE 802.11be standard.
  • an example of the present specification may be applied to a new WLAN standard that improves the EHT standard or IEEE 802.11be.
  • 1 is a conceptual diagram illustrating a structure of a WLAN.
  • BSS infrastructure basic service set
  • IEEE Institute of Electrical and Electronic Engineers
  • the WLAN system may include one or more infrastructure BSSs 100 and 105 (hereinafter, BSS).
  • BSSs 100 and 105 are a set of APs and STAs such as an access point 125 and a STA1 (Station 100-1) capable of successfully synchronizing and communicating with each other, and do not indicate a specific area.
  • the BSS 105 may include one or more STAs 103-1 and 105-2 that can be coupled to one AP 130.
  • the BSS may include at least one STA, APs 125 and 130 for providing a distribution service, and a distribution system (DS) 110 for connecting a plurality of APs.
  • STA STA
  • APs 125 and 130 for providing a distribution service
  • DS distribution system
  • the distributed system 110 may connect several BSSs 100 and 105 to implement an extended service set (ESS) 140 which is an extended service set.
  • ESS 140 may be used as a term indicating one network in which one or several APs 125 and 230 are connected through the distributed system 110.
  • APs included in one ESS 140 may have the same service set identification (SSID).
  • the portal 120 may serve as a bridge for connecting the WLAN network (IEEE 802.11) to another network (eg, 802.X).
  • IEEE 802.11 IEEE 802.11
  • 802.X another network
  • a network between the APs 125 and 130 and a network between the APs 125 and 130 and the STAs 100-1, 105-1 and 105-2 may be implemented. However, it may be possible to perform communication by setting up a network even between STAs without the APs 125 and 130.
  • a network that performs communication by establishing a network even between STAs without APs 125 and 130 is defined as an ad-hoc network or an independent basic service set (BSS).
  • FIG. 1 is a conceptual diagram illustrating an IBSS.
  • the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not contain an AP, there is no centralized management entity. That is, in the IBSS, the STAs 150-1, 150-2, 150-3, 155-4, and 155-5 are managed in a distributed manner. In the IBSS, all STAs 150-1, 150-2, 150-3, 155-4, and 155-5 may be mobile STAs, and are not allowed to access a distributed system, and thus are self-contained. network).
  • a STA is any functional medium that includes medium access control (MAC) and physical layer interface to a wireless medium that is compliant with the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. May be used to mean both an AP and a non-AP STA (Non-AP Station).
  • MAC medium access control
  • IEEE Institute of Electrical and Electronics Engineers
  • the STA may include a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile subscriber unit ( It may also be called various names such as a mobile subscriber unit) or simply a user.
  • WTRU wireless transmit / receive unit
  • UE user equipment
  • MS mobile station
  • a mobile subscriber unit It may also be called various names such as a mobile subscriber unit) or simply a user.
  • FIG. 2 is a diagram illustrating a general link setup process.
  • the STA may perform a network discovery operation.
  • the network discovery operation may include a scanning operation of the STA. That is, in order for the STA to access the network, it must find a network that can participate. The STA must identify a compatible network before joining the wireless network.
  • the network identification process existing in a specific area is called scanning. There are two types of scanning methods, active scanning and passive scanning.
  • the STA performing scanning transmits a probe request frame and waits for a response to discover which AP exists in the vicinity while moving channels.
  • the responder transmits a probe response frame to the STA that transmits the probe request frame in response to the probe request frame.
  • the responder may be an STA that last transmitted a beacon frame in the BSS of the channel being scanned.
  • the AP since the AP transmits a beacon frame, the AP becomes a responder.
  • the responder is not constant.
  • an STA that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 stores the BSS-related information included in the received probe response frame and stores the next channel (eg, number 2).
  • Channel to perform scanning (i.e., probe request / response transmission and reception on channel 2) in the same manner.
  • the scanning operation may be performed by a passive scanning method.
  • An STA that performs scanning based on passive scanning may wait for a beacon frame while moving channels.
  • the beacon frame is one of management frames in IEEE 802.11.
  • the beacon frame is notified of the existence of a wireless network and is periodically transmitted to allow the STA performing scanning to find the wireless network and participate in the wireless network.
  • the AP periodically transmits a beacon frame
  • STAs in the IBSS rotate and transmit a beacon frame.
  • the STA that performs the scanning receives the beacon frame, the STA stores the information about the BSS included in the beacon frame and records beacon frame information in each channel while moving to another channel.
  • the STA may store BSS related information included in the received beacon frame, move to the next channel, and perform scanning on the next channel in the same manner.
  • the STA may perform an authentication process through step S220.
  • This authentication process may be referred to as a first authentication process to clearly distinguish from the security setup operation of step S240 described later.
  • the authentication process of S220 may include a process in which the STA transmits an authentication request frame to the AP, and in response thereto, the AP transmits an authentication response frame to the STA.
  • An authentication frame used for authentication request / response corresponds to a management frame.
  • the authentication frame includes an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a Robust Security Network, and a finite cyclic group. Group) and the like.
  • the STA may transmit an authentication request frame to the AP.
  • the AP may determine whether to allow authentication for the corresponding STA based on the information included in the received authentication request frame.
  • the AP may provide a result of the authentication process to the STA through an authentication response frame.
  • the successfully authenticated STA may perform a connection process based on step S230.
  • the association process includes a process in which the STA transmits an association request frame to the AP, and in response thereto, the AP transmits an association response frame to the STA.
  • the connection request frame may include information related to various capabilities, beacon listening interval, service set identifier (SSID), supported rates, supported channels, RSN, and mobility domain. It may include information about supported operating classes, TIM Broadcast Indication Map Broadcast request, interworking service capability, and the like.
  • connection response frame may include information related to various capabilities, status codes, association IDs (AIDs), support rates, Enhanced Distributed Channel Access (EDCA) parameter sets, Received Channel Power Indicators (RCPI), Received Signal to Noise Information, such as an indicator, a mobility domain, a timeout interval (association comeback time), an overlapping BSS scan parameter, a TIM broadcast response, and a QoS map.
  • AIDs association IDs
  • EDCA Enhanced Distributed Channel Access
  • RCPI Received Channel Power Indicators
  • Received Signal to Noise Information such as an indicator, a mobility domain, a timeout interval (association comeback time), an overlapping BSS scan parameter, a TIM broadcast response, and a QoS map.
  • step S240 the STA may perform a security setup process.
  • the security setup process of step S240 may include, for example, performing a private key setup through 4-way handshaking through an EAPOL (Extensible Authentication Protocol over LAN) frame. .
  • EAPOL Extensible Authentication Protocol over LAN
  • FIG. 3 is a diagram illustrating an example of a PPDU used in the IEEE standard.
  • the LTF and STF fields include a training signal
  • the SIG-A and SIG-B include control information for a receiving station
  • the data field includes user data corresponding to a PSDU (MAC PDU / Aggregated MAC PDU). Included.
  • the HE PPDU according to FIG. 3 is an example of a PPDU for multiple users.
  • the HE-SIG-B is included only for the multi-user, and the HE-SIG-B may be omitted in the PPDU for the single user.
  • a HE-PPDU for a multiple user includes a legacy-short training field (L-STF), a legacy-long training field (L-LTF), a legacy-signal (L-SIG), High efficiency-signal A (HE-SIG-A), high efficiency-signal-B (HE-SIG-B), high efficiency-short training field (HE-STF), high efficiency-long training field (HE-LTF) It may include a data field (or MAC payload) and a PE (Packet Extension) field. Each field may be transmitted during the time period shown (ie, 4 or 8 ms, etc.).
  • the resource unit may include a plurality of subcarriers (or tones).
  • the resource unit may be used when transmitting signals to a plurality of STAs based on the OFDMA technique.
  • a resource unit may be defined even when transmitting a signal to one STA.
  • Resource units may be used for STFs, LTFs, data fields and the like.
  • FIG. 4 is a diagram illustrating an arrangement of resource units (RUs) used on a 20 MHz band.
  • resource units corresponding to different numbers of tones (ie, subcarriers) may be used to configure some fields of the HE-PPDU.
  • resources may be allocated in units of RUs shown for HE-STF, HE-LTF, and data fields.
  • 26-units ie, units corresponding to 26 tones
  • Six tones may be used as the guard band in the leftmost band of the 20 MHz band, and five tones may be used as the guard band in the rightmost band of the 20 MHz band.
  • seven DC tones are inserted into the center band, that is, the DC band, and there may be 26 units corresponding to each of 13 tones to the left and right of the DC band.
  • other bands may be allocated 26-unit, 52-unit, 106-unit. Each unit can be assigned for a receiving station, ie a user.
  • the RU arrangement of FIG. 4 is utilized not only for the situation for a plurality of users (MU), but also for the situation for a single user (SU), in which case one 242-unit is shown as shown at the bottom of FIG. It is possible to use and in this case three DC tones can be inserted.
  • FIG. 5 is a diagram illustrating an arrangement of resource units (RUs) used on a 40 MHz band.
  • the example of FIG. 5 may also use 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, and the like.
  • five DC tones can be inserted at the center frequency, 12 tones are used as the guard band in the leftmost band of the 40 MHz band, and 11 tones are in the rightmost band of the 40 MHz band. This guard band can be used.
  • the 484-RU may be used when used for a single user. Meanwhile, the specific number of RUs may be changed 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.
  • the example of FIG. 6 may also use 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, and the like. have.
  • seven DC tones can be inserted in the center frequency, 12 tones are used as the guard band in the leftmost band of the 80 MHz band, and 11 tones in the rightmost band of the 80 MHz band. This guard band can be used.
  • a 996-RU when used for a single user, a 996-RU may be used, in which case five DC tones may be inserted.
  • the specific number of RUs may be changed as in the example of FIGS. 4 and 5.
  • FIG. 7 is a diagram illustrating another example of the HE-PPDU.
  • the technical features of the HE-PPDU shown in FIG. 7 may also be applied to the EHT-PPDU to be newly proposed.
  • the technical feature applied to the HE-SIG may be applied to the EHT-SIG
  • the technical feature applied to the HE-STF / LTF may be applied to the EHT-SFT / LTF.
  • the illustrated L-STF 700 may include a short training orthogonal frequency division multiplexing symbol.
  • the L-STF 700 may be used for frame detection, automatic gain control (AGC), diversity detection, and coarse frequency / time synchronization.
  • AGC automatic gain control
  • the L-LTF 710 may include a long training orthogonal frequency division multiplexing symbol.
  • the L-LTF 710 may be used for fine frequency / time synchronization and channel prediction.
  • L-SIG 720 may be used to transmit control information.
  • the L-SIG 720 may include information about a data rate and a data length.
  • the L-SIG 720 may be repeatedly transmitted. That is, the L-SIG 720 may be configured in a repeated format (for example, may be referred to as an R-LSIG).
  • the HE-SIG-A 730 may include control information common to the receiving station.
  • the HE-SIG-A 730 may include 1) a DL / UL indicator, 2) a BSS color field which is an identifier of a BSS, 3) a field indicating a remaining time of a current TXOP interval, 4) 20, Bandwidth field indicating whether 40, 80, 160, 80 + 80 MHz, 5) field indicating the MCS scheme applied to HE-SIG-B, 6) dual subcarrier modulation for HE-SIG-B for MCS ( field indicating whether the module is modulated by a dual subcarrier modulation scheme, 7) a field indicating the number of symbols used for the HE-SIG-B, and 8) a field indicating whether the HE-SIG-B is generated over the entire band.
  • PE packet extension
  • 13 a field indicating information on a CRC field of HE-SIG-A.
  • the HE-SIG-B 740 may be included only when it is a PPDU for a multi-user (MU) as described above.
  • the HE-SIG-A 750 or the HE-SIG-B 760 may include resource allocation information (or virtual resource allocation information) for at least one receiving STA.
  • the HE-STF 750 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment.
  • MIMO multiple input multiple output
  • OFDMA orthogonal frequency division multiple access
  • the HE-LTF 760 may be used to estimate a channel in a MIMO environment or an OFDMA environment.
  • the size of the FFT / IFFT applied to the field after the HE-STF 750 and the HE-STF 750 may be different from the size of the FFT / IFFT applied to the field before the HE-STF 750.
  • the size of the FFT / IFFT applied to the fields after the HE-STF 750 and the HE-STF 750 may be four times larger than the size of the IFFT applied to the field before the HE-STF 750.
  • a field of s is called a first field
  • at least one of the data field 770, the HE-STF 750, and the HE-LTF 760 may be referred to as a second field.
  • the first field may include a field related to a legacy system
  • the second field may include a field related to a HE system.
  • 256 FFT / IFFT is applied for a bandwidth of 20 MHz
  • 512 FFT / IFFT is applied for a bandwidth of 40 MHz
  • 1024 FFT / IFFT is applied for a bandwidth of 80 MHz
  • 2048 FFT for a bandwidth of 160 MHz continuous or discontinuous 160 MHz.
  • / IFFT can be applied.
  • a subcarrier spacing of 312.5 kHz which is a conventional subcarrier spacing, may be applied to the first field of the HE PPDU, and a subcarrier space of 78.125 kHz may be applied to the second field of the HE PPDU.
  • the length of an OFDM symbol may be a value obtained by adding a length of a guard interval (GI) to an IDFT / DFT length.
  • the length of the GI can be various values such as 0.4 ⁇ s, 0.8 ⁇ s, 1.6 ⁇ s, 2.4 ⁇ s, 3.2 ⁇ s.
  • the frequency band used by the first field and the frequency band used by the second field are represented in FIG. 7, they may not exactly coincide with each other.
  • the main bands of the first fields L-STF, L-LTF, L-SIG, HE-SIG-A, and HE-SIG-B corresponding to the first frequency band are the second field HE-STF.
  • HE-LTF, Data is the same as the main band, but in each frequency band, the interface may be inconsistent. 4 to 6, since a plurality of null subcarriers, DC tones, guard tones, etc. are inserted in the process of arranging the RU, it may be difficult to accurately match the interface.
  • the user may receive the HE-SIG-A 730 and may be instructed to receive the downlink PPDU based on the HE-SIG-A 730.
  • the STA may perform decoding based on the changed FFT size from the field after the HE-STF 750 and the HE-STF 750.
  • the STA may stop decoding and configure a network allocation vector (NAV).
  • NAV network allocation vector
  • the cyclic prefix (CP) of the HE-STF 750 may have a larger size than the CP of another field, and during this CP period, the STA may perform decoding on the downlink PPDU by changing the FFT size.
  • data (or frame) transmitted from the AP to the STA is called downlink data (or downlink frame), and data (or frame) transmitted from the STA to the AP is called uplink data (or uplink frame).
  • downlink data or downlink frame
  • uplink data or uplink frame
  • the transmission from the AP to the STA may be expressed in terms of downlink transmission
  • the transmission from the STA to the AP may be expressed in terms of uplink transmission.
  • FIG. 8 is a diagram for explaining an example of a frame structure used in an IEEE 802.11 system.
  • the STF, LTF, and SIG fields shown in FIG. 8 may be the same as or correspond to the (HT / VHT / EHT) -STF, LTF, and SIG fields shown in FIG. 3 or 7.
  • the DATA field illustrated in FIG. 8 may be the same as or correspond to the DATA field illustrated in FIGS. 3/7.
  • the data field may include a SERVICE field, a physical layer service data unit (PSDU), a PPDU TAIL bit, and may also include a padding bit if necessary.
  • Some bits of the SERVICE field may be used for synchronization of the descrambler at the receiving end.
  • the PSDU corresponds to a MAC Protocol Data Unit (MPDU) defined in the MAC layer and may include data generated / used in an upper layer.
  • the PPDU TAIL bit can be used to return the encoder to zero state.
  • the padding bit may be used to adjust the length of the data field in a predetermined unit.
  • the MPDU is defined according to various MAC frame formats, and the basic MAC frame is composed of a MAC header, a frame body, and a frame check sequence (FCS).
  • the MAC frame is composed of MPDUs and can be transmitted / received through the PSDU of the data portion of the PPDU frame format.
  • the MAC header includes a frame control field, a duration / ID field, an address field, and the like.
  • the frame control field may include control information required for frame transmission / reception.
  • the duration / ID field may be set to a time for transmitting the corresponding frame.
  • the duration / ID field included in the MAC header may be set to 16 bits long (e.b., B0 to B15).
  • the content included in the period / ID field may vary depending on the frame type and subtype, whether the content is transmitted during the CFP (contention free period), the QoS capability of the transmitting STA, and the like.
  • the duration / ID field may include the AID of the transmitting STA (e.g., via 14 LSB bits) and the 2 MSB bits may be set to one.
  • the duration / ID field may be set to a fixed value (e.g., 32768).
  • the duration / ID field may include a duration value defined for each frame type.
  • the frame control field of the MAC header may include Protocol Version, Type, Subtype, To DS, From DS, More Fragment, Retry, Power Management, More Data, Protected Frame, and Order subfields.
  • An example of the present specification relates to a control field included in a PPDU.
  • the PPDU of the present specification may be transmitted and received via a radio signal.
  • a PPDU may include a part of a field of the HE-PPDU shown in FIG. 7.
  • the PPDU of the present specification may be called various names such as an EHT-PPDU, a first type PPDU, and the like.
  • the PPDU and the fields (or subfields) included in the PPDU of the present specification may be based on the EHT standard or the IEEE 802.11be standard or a new standard that improves the EHT / IEEE 802.11be standard.
  • the control field of the present specification may be a SIG-B field.
  • the control field of the present specification may be called various names such as SIG-B field, EHT-SIG-B field, and the like.
  • SIG-A, EHT-SIG-A, SIG-C, EHT-SIG-C It may also be called another name.
  • control field of the present specification may be based on the technical features of the HE-SIG-B.
  • the technical features of the HE-SIG-B, applicable to the control field for example, EHT-SIG-A / B / C) of the present specification, will be described.
  • the HE-SIG-B field 910 includes a common field 920 and a user-specific field 930.
  • the common field 920 may include information commonly applied to all users (ie, user STAs) receiving the SIG-B.
  • the user-individual field 930 may be referred to as a user-individual control field.
  • the user-individual field 930 is provided when the SIG-B is delivered to a plurality of users. Applicable only to any part of the plurality of users.
  • the common field 920 and the user-individual field 930 may be separately encoded.
  • the common field 920 may include RU allocation information of N * 8 bits.
  • the RU allocation information may include information regarding 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 about which RU (26-RU / 52-RU / 106-RU) is 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 920 is set as '00000000', nine 26-RUs may be allocated to the corresponding channel (ie, 20 MHz).
  • the RU allocation information of the common field 920 is set as '00000001' as shown in Table 1, seven 26-RUs and one 52-RU are arranged in a corresponding channel. That is, in the example of FIG. 4, 52-RU may be allocated at the rightmost side and seven 26-RU may be allocated at 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 the 20 MHz channel and five 26-RUs are allocated to the right side thereof.
  • a plurality of User STAs may be allocated to the 106-RU based on the MU-MIMO scheme.
  • up to eight User STAs may be allocated to the 106-RU, and the number of User STAs allocated to the 106-RU is determined based on 3-bit information (y2y1y0). For example, when the 3-bit information (y2y1y0) is set to N, the number of User STAs allocated to the 106-RU based on the MU-MIMO scheme may be N + 1.
  • one User STA may be allocated to one RU.
  • a plurality of User STAs may be allocated to RUs having a specific size (for example, 106 subcarriers) or more based on the MU-MIMO scheme.
  • the user-individual field 930 may include a plurality of user fields.
  • the number of user STAs allocated to a specific channel may be determined based on the RU allocation information of the common field 920. For example, when the RU allocation information of the common field 920 is '00000000', one user STA may be allocated to each of nine 26-RUs (that is, nine user STAs may be allocated). That is, up to nine User STAs may be allocated to a specific channel through the OFDMA technique. In other words, up to nine User STAs may be allocated to a specific channel through a non-MU-MIMO technique.
  • a plurality of User STAs are allocated to the 106-RU disposed at the leftmost side through the MU-MIMO scheme, and five 26-RUs arranged at the right side thereof are assigned to Five User STAs may be allocated through a non-MU-MIMO scheme. This case is embodied through the example of FIG. 10.
  • FIG. 10 shows an example in which a plurality of User STAs are allocated to the same RU through the MU-MIMO technique.
  • 106-RU is allocated to the leftmost side of a specific channel and five 26-RUs are allocated to the right side thereof. Can be.
  • a total of three User STAs may be allocated to the 106-RU through the MU-MIMO scheme.
  • the user-individual field 930 of the HE-SIG-B may include eight User fields.
  • Eight user fields may be included in the order shown in FIG. 10, and as shown in FIG. 9, two user fields may be implemented as one user block field.
  • the user field shown in FIG. 10 may be configured based on two formats. That is, the user field related to the MU-MIMO scheme may be configured in the first format, and the user field related to the non-MU-MIMO scheme 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.
  • Each User field may have the same size (for example, 20 bits).
  • a user field of a first format (format of MU-MIMO technique) may be configured as follows.
  • the first bit (eg, B0-B10) in the user field may be identification information (eg, STA-ID, partial AID, etc.) of the user STA to which the corresponding user field is assigned. It may include.
  • the second bit (eg, B11-B14) in the user field may include information about a spatial configuration. Specifically, one example of the second bits (ie, B11-B14) may be as shown in Tables 3 to 4 below.
  • the information about the number of spatial streams for the user STA may consist of 4 bits.
  • information on the number of spatial streams for the user STA may support up to eight spatial streams.
  • information about the number of spatial streams may support up to four spatial streams for one User STA.
  • the third bit (ie, B15-18) in the user field (ie, 20 bits) may include MCS (Modulation and coding scheme) information.
  • the MCS information may be applied to a data field in a PPDU in which a corresponding SIG-B is included.
  • the MCS information may be indicated by a specific index value.
  • the MCS information may be represented by index 0 through index 11.
  • MCS information includes information about constellation modulation type (e.g., BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, etc.), and coding rate (e.g., 1/2, 2 / 3, 3/4, 5/6, etc.).
  • the MCS information may exclude information about a channel coding type (eg, BCC or LDPC).
  • the fourth bit (ie, B19) in the user field may be a reserved field.
  • the 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 about the type of channel coding (for example, BCC or LDPC) applied to the data field in the PPDU including the corresponding SIG-B.
  • a coding type eg, BCC or LDPC
  • the fifth bit (ie, B20) may include information about the type of channel coding (for example, BCC or LDPC) applied to the data field in the PPDU including the corresponding SIG-B.
  • the above example relates to a User Field of a first format (format of 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 bits (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 the beamforming steering matrix is applied.
  • the fourth bits (eg, B15-B18) in the user field of the second format may include modulation and coding scheme (MCS) information.
  • the 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 new WLAN standard to which the present specification may be applied may include various technical features (eg, up to 320 MHz channel, support for up to 16 spatial streams, and multi-link communication) to provide higher data rates. .
  • the new WLAN standard may support up to 16 spatial streams for one User STA in single-user (SU) communication or non-MU-MIMO communication.
  • the new WLAN standard can support up to eight spatial streams for one User STA in MU-MIMO communication.
  • An example of Table 3 / Table 4 supports up to 8 spatial streams (up to 4 for one User STA) in MU-MIMO communication, but the example of Table 3 / Table 4 cannot support the new WLAN standard.
  • the present specification proposes the following improved information field.
  • the following information field may be composed of N bits (eg, 8 bits).
  • the following information field includes information about the number of spatial streams for a user STA.
  • the following information field may be included in a user-specific control field of the SIG field (eg, EHT-SIG-A / B / C). That is, the SIG field (eg, EHT-SIG-A / B / C) used in the present specification may include technical features of FIGS. 9 and / or 10.
  • the new WLAN standard may support up to 16 spatial streams for one User STA in single-user (SU) communication or non-MU-MIMO communication.
  • the new WLAN standard can support up to eight spatial streams for one User STA in MU-MIMO communication.
  • an information field including information on the number of spatial streams for a user STA may be set in consideration of the following technical features.
  • Table 6 shows an example in which the total number of User STAs to which MU-MIMO is applied is three. As shown in Table 6, when the total number of User STAs to which MU-MIMO is applied is 3, the total number of cases related to the spatial stream allocated to each User STA is 89.
  • Table 7 shows an example in which the total number of User STAs to which MU-MIMO is applied is four. As shown in Table 7, when the total number of User STAs to which MU-MIMO is applied is 4, the total number of cases related to the spatial stream allocated to each User STA is 129.
  • Table 8 shows an example in which the total number of User STAs to which MU-MIMO is applied is five. As shown in Table 8, when the total number of User STAs to which MU-MIMO is applied is 5, the total number of cases related to the spatial stream allocated to each User STA is 135.
  • Table 9 shows an example in which the total number of User STAs to which MU-MIMO is applied is six. As shown in Table 9, when the total number of User STAs to which MU-MIMO is applied is 6, the total number of cases related to the spatial stream allocated to each User STA is 119.
  • Table 10 shows an example in which the total number of User STAs to which MU-MIMO is applied is seven. As shown in Table 10, when the total number of User STAs to which MU-MIMO is applied is 7, the total number of cases related to the spatial stream allocated to each User STA is 89.
  • Table 11 shows an example in which the total number of User STAs to which MU-MIMO is applied is eight. As shown in Table 11, when the total number of User STAs to which MU-MIMO is applied is eight, the total number of cases related to the spatial stream allocated to each User STA is 65.
  • Table 12 shows an example in which the total number of User STAs to which MU-MIMO is applied is nine. As shown in Table 12, when the total number of User STAs to which MU-MIMO is applied is 9, the total number of cases related to the spatial stream allocated to each User STA is 44.
  • Table 13 shows an example in which the total number of User STAs to which MU-MIMO is applied is 10. As shown in Table 13, when the total number of User STAs to which MU-MIMO is applied is 10, the total number of cases related to the spatial stream allocated to each User STA is 28.
  • Table 14 shows an example in which the total number of User STAs to which MU-MIMO is applied is 11. As shown in Table 14, when the total number of User STAs to which MU-MIMO is applied is 11, the total number of cases related to the spatial stream allocated to each User STA is 19.
  • Table 15 shows an example in which the total number of User STAs to which MU-MIMO is applied is 12. As shown in Table 15, when the total number of User STAs to which MU-MIMO is applied is 12, the total number of cases related to the spatial stream allocated to each User STA is 12.
  • Table 16 shows an example of a total number of User STAs to which MU-MIMO is applied. As shown in Table 16, when the total number of User STAs to which MU-MIMO is applied is 13, the total number of cases related to the spatial stream allocated to each User STA is seven.
  • Table 17 shows an example of a total number of User STAs to which MU-MIMO is applied. As shown in Table 17, when the total number of User STAs to which MU-MIMO is applied is 14, the total number of cases related to the spatial stream allocated to each User STA is four.
  • Table 18 shows an example in which the total number of User STAs to which MU-MIMO is applied is 15. As shown in Table 18, when the total number of User STAs to which MU-MIMO is applied is 15, the total number of cases related to the spatial stream allocated to each User STA is two.
  • Table 19 shows an example in which the total number of User STAs to which MU-MIMO is applied is 16. As shown in Table 19, when the total number of User STAs to which MU-MIMO is applied is 16, the total number of cases related to the spatial stream allocated to each User STA is one.
  • a plurality of bits are required to include information about spatial streams allocated to up to 16 User STAs. That is, for example, in order to show the case of Table 5, a bit indicating 36 cases is required.
  • the largest number of cases that should be indicated is the case of Table 8 (ie, when five User STAs are supported). That is, when five user STAs are supported, a total of 135 cases occur. Accordingly, the information field of the present specification may be composed of 8 bits.
  • information on a stream corresponding to a user STA may be identified as shown in Tables 20 to 34 below. That is, as shown in Tables 20 to 34, a combination of different stream numbers may be displayed on the same bit information based on the total number of user STAs (N_user).
  • 8-bit information such as Tables 20 to 34 may be included in the User field in the User Specific field 930 shown in FIG. 9.
  • the total number of user STAs (N_user) shown in Tables 20 to 34 may be included in the RU allocation information in the common field 920 illustrated in FIG. 9.
  • information related to the total number of user STAs (N_user) may be included in the RU allocation information in the common field 920 through 3-bit information of “y2y1y0”.
  • Specific values of Tables 20 to 34 may be changed.
  • the specific value of the 8 bit information can be changed. For example, any eight values other than "00000000-00000111" can be used.
  • Tables 20 to 34 may be represented by the following table, but may be represented by one lookup table.
  • N_user 2 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000111 1-8 One 00001000-00001110 2-8 2 00001111-00010100 3-8 3 00010101-00011001 4-8 4 00011010-00011101 5-8 5 00011110-00100000 6-8 6 00100001-00100010 7-8 7 00100011 8 8
  • N_user 3 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000111 1-8 One One 00001000-00001110 2-8 2 One 00001111-00010100 3-8 3 One 00010101-00011001 4-8 4 One 00011010-00011101 5-8 5 One 00011110-00100000 6-8 6 One 00100001-00100010 7-8 7 One 00100011-00101001 2-8 2 2 00101010-00101111 3-8 3 2 00110000-00110100 4-8 4 2 00110101-00111000 5-8 5 2 00111001-00111011 6-8 6 2 00111
  • N_user 4 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000111 1-8 One One One 00001000-00001110 2-8 2 One One 00001111-00010100 3-8 3 One One 00010101-00011001 4-8 4 One One 00011010-00011101 5-8 5 One One 00011110-00100000 6-8 6 One One 00100001 7 7 One One One 00100010-00101000 2-8 2 2 One 00101001-00101110 3-8 3 2 One 00101111-00110011 4-8 4 2 One 00110100-00110111 5-8 5 2 One 00111000-00
  • N_user 5 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000111 1-8 One One One One One 00001000-00001110 2-8 2 One One One One 00001111-00010100 3-8 3 One One One One 00010101-00011001 4-8 4 One One One 00011010-00011101 5-8 5 One One One One One 00011110-00011111 6-7 6 One One One One One 00100000-00100110 2-8 2 2 One One 00100111-00101100 3-8 3 2 One One 00101101-00110001 4-8 4 2 One One 00110010-00110100 5-7 5 2
  • N_user 6 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000111 1-8 One One One One One One One One One One 00001000-00001110 2-8 2 One One One One One One One 00001111-00010100 3-8 3 One One One One One One One One One One 00010101-00011001 4-8 4 One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One
  • N_user 7 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000111 1-8 One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One 00001000-00001101 2-7 2 One One One One One One One One One One One 00010100-00010111 4-7 4 One One One One One One One One One One One One One 00011000-00011001 5-6 5 One One One One One One One One One One One One One One One One One One One One 00100110-00101000 4-6 4 2 One One One One One One One One One One 00101
  • N_user 8 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000111 1-8 One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One
  • N_user 9 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nst
  • N_user 10 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000100 1-7 One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One 00011000 3 3
  • N_user 11 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000101 1-6 One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One
  • N_user 12 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000100 1-5 One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One
  • N_user 13 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000011 1-4 One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One
  • N_user 14 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000010 1-3 One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One
  • N_user 15 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000-00000001 1-2 One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One
  • N_user 16 bits Nsts [1] Nsts [2] Nsts [3] Nsts [4] Nsts [5] Nsts [6] Nsts [7] Nsts [8] Nsts [9] Nsts [10] Nsts [11] Nsts [12] Nsts [13] Nsts [14] Nsts [15] Nsts [16] 00000000 One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One One
  • up to 16 spatial streams may be supported in the new WLAN standard.
  • it is necessary to signal capability information related to the spatial stream in the WLAN system.
  • FIG. 11 is an example of a field signaling capability information related to a spatial stream.
  • the field shown is part of the HE PHY Capabilities Information field.
  • information about whether to support the 1024-QAM scheme for less than 242-RU used for transmission via B74 in FIG. 11 may be signaled.
  • information about whether to support the 1024-QAM scheme for less than 242-RU used for reception through B75 of FIG. 11 may be signaled.
  • B76 of FIG. 11 information about whether to support a reception signal in which one RU is allocated to the entire band of the MU PPDU may be signaled.
  • B77 of FIG. 11 information about whether to support a reception signal in which one RU is allocated to the entire band of the MU PPDU of 80 MHz or less may be signaled.
  • FIG. 11 B78 may be set to the first value. If not, B78 of FIG. 11 may be set to a second value.
  • B78 may be set as a second value.
  • B78 of FIG. 11 may be set as the first value.
  • the field of FIG. 11 has been described based on the HE PHY Capabilities Information field for convenience of description. However, since the field of FIG. 11 is changeable, B78 of FIG. 11 may be included in a new information field / information element newly described. In addition, B78 may be included in the N bit field instead of 1 bit information.
  • the fields of FIG. 11 may be included in various frames (eg, beacons, probe requests, probe responses, association requests, association responses, and / or management frames).
  • the user STA or the AP may negotiate the maximum number of spatial streams by transmitting the field of FIG. 11 and receiving a reply thereto. For example, only when both the user STA and the AP support up to 16 spatial streams, the user STA and the AP may perform communication based on up to 16 spatial streams.
  • Additional signaling may be required for the user STA and / or the AP to perform an operation supporting up to 16 spatial streams.
  • information about the highest MCS index supported for each spatial stream is signaled.
  • the Tx HE-MCS Map subfields of the IEEE 802.11ax specification conveyed information about the highest MCS index. This specification improves this signaling technique.
  • 12 is an example of a field that conveys information about the highest MCS index associated with up to 16 spatial streams.
  • B16 and B17 of FIG. 12 may convey information about available MCS indexes for nine spatial streams through 2-bit information.
  • the same technique can be used for 10-16 spatial streams. That is, B30 and 31 of FIG. 12 may carry information on MCS indexes available for 16 spatial streams.
  • the field of FIG. 12 may be included in a newly defined field, and may be transmitted through various frames (eg, beacons, Probe Requests, Probe Responses, Association Requests, Association Responses, and / or management frames).
  • the SIG field of the new standard may include the technical features of FIGS. 9/10. That is, the new SIG field may include a plurality of user fields as shown in FIG. 10.
  • the user field may be configured based on two formats. That is, the user field related to the MU-MIMO scheme may be configured in the first format, and the user field related to the non-MU-MIMO scheme may be configured in the second format.
  • An example of the user field set to the second format may include the following bits.
  • the user field of the second format includes a) identification information of a user STA, b) information on the number of spatial streams applied to the corresponding RU through 4 bit information, and c) a beamforming steering matrix is applied.
  • D) information about the MCS applied to the data field e) information on whether or not Dual Carrier Modulation (DCM) is applied, and / or f) the type of coding applied to the data field (e.g. , BCC or LDPC).
  • DCM Dual Carrier Modulation
  • the type of coding applied to the data field e.g. , BCC or LDPC.
  • the user field of the second format indicates information about the number of spatial streams through 4-bit information (not 3 bits).
  • Table 35 An example of the User field set to the first format is shown in Table 35 below. Since only at least one of the information elements of Table 35 may be used, some of the bits of Table 35 may be omitted / changed.
  • Bit Subfield Number of bits Description B0-B10 STA-ID 11 Set to a value of element indicated from TXVECTOR parameter STA_ID_LIST B11 16 stream One Indicates the size of table for spatial configuration Set to 1 for 8bit indication B12-B17 Spatial Configuration 4/8 Indicates the number of spatial streams for a STA in an MU-MIMO allocation If 16 stream equal to 0, it uses the only 4bit of MSB / LSB on 8bits B18-B21 MCS 4 Modulation and coding scheme. Set to n for MCS n , where n 0, 1, 2,... 11 Values 12 to 15 are reserved B22 Coding One Indicates whether BCC or LDPC is used. Set to 0 for BCC Set to 1 for LDPC
  • the information of B0-B10, the information of B18-B21, and the information of B22 are the same as the first bit, third bit, and fifth bit described in the example of FIG.
  • User STAs and / or APs may support up to eight spatial streams in accordance with the IEEE 802.11ax specification (or earlier WLAN specifications), and up to 16 spatial streams in accordance with the IEEE 802.11be specification (or a newer specification). You can also apply.
  • information about the number of spatial streams allocated to the user STA may be transmitted through 4-bit information as shown in Tables 3 and 4 above.
  • information about the number of spatial streams allocated to the user STA must be transmitted through 8-bit information as shown in Tables 20 to 34 above.
  • the information on the number of spatial streams allocated to the user STA is configured with the first type (for example, 4-bit information as shown in Tables 3 and 4) or the second type (for example, Tables 20 through Table).
  • the example in Table 35 suggests B11 bits.
  • B11 is set to the first value (for example, 1)
  • spatial configuration information supporting up to 16 spatial streams that is, 8-bit information such as Tables 20 to 34
  • B11 is the second value ( For example, when set to 0)
  • spatial configuration information that is, 4-bit information as shown in Table 3/4
  • Information about the number of spatial streams allocated to a user STA may be signaled through B12-B17 bits. If 4-bit information is used for space setting, only some of the B12-B17 (MSB / LSB) can be used.
  • the capablity of the user STA it may be inefficient for the user STA to obtain the spatial setting through the 4-bit information or to obtain the spatial setting through the 8-bit information. Accordingly, even if the user STA supports up to eight spatial streams, an additional example of obtaining spatial configuration through 8-bit information may be required.
  • Table 35 may be modified as follows.
  • the user STA supports a maximum of 8 spatial streams
  • an example of obtaining a spatial configuration through 8-bit information is proposed.
  • a technique of utilizing only a part (eg, MSB 4 bits or LSB 4 bits) of an 8 bit information field (ie, 8 bit sequence) with Tables 20 to 34 may be proposed. That is, a user STA that supports up to 16 spatial streams acquires the number of spatial streams allocated to the user STA based on an 8-bit information field, and a user STA that supports up to 8 spatial streams selects one of the 8-bit information fields.
  • the number of spatial streams allocated to the user STA may be obtained based on only 4 bits (for example, MSB 4 bits or LSB 4 bits).
  • Table 36 shows an example in which two User STAs are allocated based on MU-MIMO.
  • the example B12-B17 bits of the example of Table 35 may include the example of Table 36.
  • the B11 bit may be omitted or may be included for explicit signaling purpose for the User STA.
  • the second example is an example in which a user STA supporting up to 16 spatial streams uses an 8-bit sequence and a user STA supporting up to 8 spatial streams also uses an 8-bit sequence.
  • a user STA supporting up to eight spatial streams may use a part of the lookup table of Table 20 without using the lookup table of Table 3 / Table 4.
  • a User STA supporting up to 16 spatial streams may have an 8-bit sequence as shown below based on Table 37 (part of Table 20). Can be used to obtain spatial settings.
  • N-user bits Nsts [1] Nsts [2] 2 00000000-00000111 1-8 One 00001000-00001110 2-8 2 00001111-00010100 3-8 3 00010101-00011001 4-8 4 00011010-00011101 5-8 5 00011110-00100000 6-8 6 00100001-00100010 7-8 7 00100011 8 8
  • the 8-bit sequence in the above table need not be used when the "00011011" through "00100011". Accordingly, a user STA supporting up to eight spatial streams can use only the lookup table shown in Table 38 below. That is, it is possible to use only legacy user STAs (that is, user STAs supporting up to eight spatial streams) among the bit values shown in Tables 20 to 34. Accordingly, the legacy user STA may store only a part of Tables 20 to 34, not all of Tables 20 to 34, and instead store the information of Tables 3 and 4 to the memory.
  • N-user bits Nsts [1] Nsts [2] 2 00000000-00000111 1-8 One 00001000-00001110 2-8 2 00001111-00010100 3-8 3 00010101-00011001 4-8 4
  • the example B12-B17 bits of the example of Table 35 may include the example of Table 37 / Table 38.
  • the B11 bit may be omitted or may be included for explicit signaling purpose for the User STA.
  • 13 is an example of a PPDU as used herein.
  • the PPDU of FIG. 13 may be transmitted based on a maximum of 16/8 spatial streams according to the above-described example.
  • the PPDU of FIG. 13 may be called various names such as EHT-PPDU.
  • the PPDU of FIG. 13 may include technical features of the HE-PPDU shown in FIGS. 4 to 7, 9 to 10, and the like.
  • All illustrated parts / fields 1310, 1320, 1330, 1340, and 1350 may be divided into a plurality of subparts / subfields. Each field (and its subfields) may be transmitted in units of 4us * N (where N is an integer). In addition, it may include a Guard Interval (or Short GI) of the conventional WIFI standard.
  • N is an integer
  • Some of the illustrated fields 1310, 1320, 1330, 1340, and 1350 may be omitted, and the order of the fields may be changed in various ways because the order of the fields is exemplarily illustrated.
  • a subfield of SIG-Part 1320 eg, EHT-SIG-A
  • the remaining subfields of SIG-Part 1320 eg, EHT-SIG-B / C
  • STF-Part 1330 e.g., EHT-SIG-A
  • the illustrated Legacy Part 1310 includes at least one of a conventional Non-HT Short Training Field (L-STF), Non-HT Long Training Field (L-LTF), and Non-HT Signal Field (L-SIG). can do.
  • L-STF Non-HT Short Training Field
  • L-LTF Non-HT Long Training Field
  • L-SIG Non-HT Signal Field
  • the illustrated SIG-Part 1320 may include various control information for the transmitted PPDU. For example, it may include control information for decoding the STF-Part 1330, the LTF-Part 1340, and the Data 1350.
  • the illustrated SIG-Part 1320 may include all / part of information included in the above-described HE-SIG-A information and information included in the HE-SIG-B information.
  • the user blocks shown in Table 35 may be included in the illustrated SIG-Part 1320.
  • the technical features of FIG. 9 / FIG. 10 may be applied to the illustrated SIG-Part 1320.
  • the illustrated SIG-Part 1320 may allocate an RU for at least one User STA through the common field 920 and the User Specific field 930.
  • the RUs identified / indicated by the SIG-Part 1320 may have various sizes, such as 26-RU, 52-RU, 106-RU, 242-RU, and the like.
  • the specific arrangement of the RU may be based on the arrangement of FIGS. 4, 5, and 6. That is, when the EHT-PPDU is transmitted on the 20 MHz channel, the arrangement of the RUs determined based on the SIG-Part 1320 may be as shown in FIG. 4. In addition, when the EHT-PPDU is transmitted on the 40 MHz channel, the arrangement of the RUs determined based on the SIG-Part 1320 may be as shown in FIG.
  • the arrangement of the RUs determined based on the SIG-Part 1320 may be as shown in FIG. 6.
  • the arrangement of the RUs may have a structure in which FIG. 6 is repeated.
  • the RU may be applied to the STF-Part 1330, the LTF-Part 1340, and the Data 1350 of FIG. 13. That is, the STF-Part 1330, the LTF-Part 1340, and the data 1350 may be configured in RU units determined based on the SIG-Part 1320.
  • the STF-Part 1330 of FIG. 13 may include an STF sequence.
  • the LTF-Part 1340 of FIG. 13 may include a training field (ie, LTF sequence) for channel estimation.
  • the data field 1350 of FIG. 13 may include user data and may include a packet for a higher layer. That is, it may include an MPDU (MAC Frame).
  • MPDU MAC Frame
  • FIG. 14 is a flowchart of a first procedure according to an example of the present specification.
  • the receiving STA may be a User STA.
  • the receiving STA may transmit and receive capability information related to the spatial stream.
  • the receiving STA may transmit capability information including the bits of FIGS. 11 and / or 12 to a transmitting STA (eg, an AP) or may receive from the transmitting STA.
  • the receiving STA may generate capability information on whether up to 16 spatial streams are supported and transmit the capability information to the transmitting STA.
  • capability information on whether a transmitting STA supports a maximum of 16 spatial streams may be received.
  • Step S1410 may be performed through various frames such as beacons, probe requests, probe responses, association requests, association responses, and / or management frames.
  • the receiving STA may receive a signal through a maximum of 16 spatial streams.
  • the receiving STA may receive a signal including a user-specific control field for multi-user (MU) communication.
  • the signal of step S1420 may be received through a maximum of 16 spatial streams.
  • the signal of step S1420 may include a PPDU.
  • the receiving STA may receive a PPDU including the EHT-SIG field. Through this, the receiving STA may acquire control information / control bit / control sequence including spatial setting information of Tables 20 to 35.
  • the user STA receives a user-specific control field through step S1420 and obtains information about the number of spatial streams allocated for the receiving STA. can do.
  • the user-specific control field of step S1420 may include a first information field about the number of spatial streams for the user STA and a size of the first information field. It may include a second information field including information about. The second information field may be omitted.
  • the first information field is composed of 4-bit information or 8-bit information, and the second information field has a first value when the first information field is 4-bit information, and the second information field is 4-bit information. In this case, it may have a second value.
  • the receiving STA may decode a data field of the received signal (ie, PPDU) based on the information obtained through operation S1420. That is, the receiving STA may acquire information related to the spatial stream for the receiving STA through step S1420, decode the PPDU based on the information, and finally decode the data field in the PPDU.
  • a data field of the received signal ie, PPDU
  • 15 is a second procedure flowchart according to an example of the present specification.
  • the transmitting STA may be an AP STA.
  • the transmitting STA may transmit and receive capability information related to the spatial stream.
  • the transmitting STA may transmit capability information including the bits of FIGS. 11 and / or 12 to a receiving STA (eg, a user STA) or may receive from the receiving STA.
  • the transmitting STA may generate capability information on whether up to 16 spatial streams are supported and transmit the capability information to the receiving STA.
  • the reception STA may receive capability information regarding whether the reception STA supports a maximum of 16 spatial streams.
  • Step S1510 may be performed through various frames such as a beacon, a probe request, a probe response, an association request, an association response, and / or a management frame.
  • both transmitting / receiving STAs support a maximum of 16 spatial streams through step S1510, the transmitting STAs may transmit signals through the maximum of 16 spatial streams.
  • the transmitting STA may generate a signal including a user-specific control field for multi-user (MU) communication.
  • the signal of step S1520 may be transmitted through a maximum of 16 spatial streams.
  • the signal of step S1520 may include a PPDU.
  • the user-specific control field of step S1520 may include a first information field about the number of spatial streams for the user STA and a size of the first information field. It may include a second information field including information about. The second information field may be omitted.
  • the first information field is composed of 4-bit information or 8-bit information, the second information field has a first value when the first information field is 4-bit information, and the second information field is 4-bit information. In this case, it may have a second value.
  • the transmitting STA may transmit the PPDU including the EHT-SIG field.
  • the transmitting STA may transmit control information / control bit / control sequence including space setting information such as Tables 20 to 35.
  • FIG. 16 illustrates a transmitting STA or a receiving STA to which an example of the present specification is applied.
  • the STA 1600 may include a processor 1610, a memory 1620, and a transceiver 1630.
  • the feature of FIG. 16 may be applied to a non-AP STA or an AP STA.
  • the illustrated processor, memory, and transceiver may be implemented as separate chips, or at least two blocks / functions may be implemented through one chip.
  • the illustrated transceiver 1630 performs transmission and reception of signals. Specifically, it is possible to transmit and receive IEEE 802.11 packets (for example, IEEE 802.11a / b / g / n / ac / ax / be, etc.).
  • IEEE 802.11 packets for example, IEEE 802.11a / b / g / n / ac / ax / be, etc.
  • the processor 1610 may implement the functions, processes, and / or methods proposed herein.
  • the processor 1610 may receive a signal through the transceiver 1630, process the received signal, generate a transmission signal, and perform control for signal transmission.
  • the processor 1610 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and a data processing device.
  • Memory 1620 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.
  • the memory 1620 may store a signal received through the transceiver (ie, a received signal) and store a signal to be transmitted through the transceiver (ie, a transmitted signal). That is, the processor 1610 may acquire the received signal through the memory 1620, and store the signal to be transmitted in the memory 1620.
  • the transceiver 110 includes a transmitting part 111 and a receiving part 112.
  • the transmission part 111 includes a discrete fourier transform (DFT) unit 1111, a subcarrier mapper 1112, an IFFT unit 1113, a CP insertion unit 1144, and a wireless transmitter 1115.
  • the transmission part 111 may further include a modulator.
  • the apparatus may further include a scramble unit (not shown), a modulation mapper (not shown), a layer mapper (not shown) and a layer permutator (not shown).
  • This may be disposed before the DFT unit 1111. That is, in order to prevent an increase in peak-to-average power ratio (PAPR), the transmission part 111 first passes the information through the DFT 1111 before mapping a signal to a subcarrier. After subcarrier mapping of the signal spread (or precoded in the same sense) by the DFT unit 1111 through the subcarrier mapper 1112, the inverse fast fourier transform (IFFT) unit 1113 is again on the time axis. Make it a signal.
  • PAPR peak-to-average power ratio
  • the DFT unit 1111 performs a DFT on the input symbols and outputs complex-valued symbols. For example, when Ntx symbols are input (where Ntx is a natural number), the DFT size is Ntx.
  • the DFT unit 1111 may be called a transform precoder.
  • the subcarrier mapper 1112 maps the complex symbols to each subcarrier in the frequency domain. The complex symbols may be mapped to resource elements corresponding to resource blocks allocated for data transmission.
  • the subcarrier mapper 1112 may be called a resource element mapper.
  • the IFFT unit 1113 performs an IFFT on the input symbol and outputs a baseband signal for data, which is a time domain signal.
  • the CP inserter 1114 copies a part of the rear part of the baseband signal for data and inserts it in the front part of the baseband signal for data.
  • ISI Inter-symbol interference
  • ICI inter-carrier interference
  • the reception part 112 includes a radio receiver 1121, a CP remover 1122, an FFT unit 1123, an equalizer 1124, and the like.
  • the wireless receiving unit 1121, the CP removing unit 1122, and the FFT unit 1123 of the receiving part 112 include a wireless transmitting unit 1115, a CP inserting unit 1114, and an IFF unit 1113 at the transmitting end 111. It performs the reverse function of).
  • the receiving part 112 may further include a demodulator.
  • the transceiver of FIG. 17 may include a reception window controller (not shown) for extracting a part of a received signal, and a decoding operation processor (not shown) for performing a decoding operation on a signal extracted through the reception window. ) May be included.
  • the technical features of the present specification described above can be applied to various applications or business models.
  • the above-described technical feature may be applied for wireless communication in an apparatus supporting artificial intelligence (AI).
  • AI artificial intelligence
  • Machine learning refers to the field of researching methodologies to define and solve various problems dealt with in the field of artificial intelligence. do.
  • Machine learning is defined as an algorithm that improves the performance of a task through a consistent experience with a task.
  • ANN Artificial Neural Network
  • the artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process of updating model parameters, and an activation function generating an output value.
  • the artificial neural network may include an input layer, an output layer, and optionally one or more hidden layers. Each layer contains one or more neurons, and the artificial neural network may include synapses that connect neurons to neurons. In an artificial neural network, each neuron may output a function value of an active function for input signals, weights, and deflections input through a synapse.
  • the model parameter refers to a parameter determined through learning and includes weights of synaptic connections and deflection of neurons.
  • the hyperparameter means a parameter to be set before learning in the 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 artificial neural networks can be seen as determining model parameters that minimize the loss function.
  • the loss function can be used as an index for determining an optimal model parameter in the learning process of an artificial neural network.
  • Machine learning can be categorized into supervised learning, unsupervised learning, and reinforcement learning.
  • Supervised learning refers to a method of learning artificial neural networks with a given label for training data, and a label indicates a 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 artificial neural networks in a state where a label for training data is not given.
  • Reinforcement learning can mean a learning method that allows an agent defined in an environment to learn to choose an action or sequence of actions that maximizes cumulative reward in each state.
  • Machine learning which is implemented as a deep neural network (DNN) including a plurality of hidden layers among artificial neural networks, is called deep learning (Deep Learning), which is part of machine learning.
  • DNN deep neural network
  • Deep Learning Deep Learning
  • machine learning is used to mean deep learning.
  • a robot can mean a machine that automatically handles or operates a given task by its own ability.
  • a robot having a function of recognizing the environment, judging itself, and performing an operation may be referred to as an intelligent robot.
  • Robots can be classified into industrial, medical, household, military, etc. according to the purpose or field of use.
  • the robot may include a driving unit including an actuator or a motor to perform various physical operations such as moving a robot joint.
  • the movable robot includes a wheel, a brake, a propeller, and the like in the driving unit, and can travel on the ground or fly in the air through the eastern part.
  • Extended reality collectively refers to virtual reality (VR), augmented reality (AR), and mixed reality (MR).
  • VR technology provides real world objects and backgrounds only in CG images
  • AR technology provides virtual CG images on real objects images
  • MR technology 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.
  • virtual objects are used as complementary objects to real objects, whereas in MR technology, virtual objects and real objects are used in an equivalent nature.
  • HMD Head-Mount Display
  • HUD Head-Up Display
  • mobile phone tablet PC, laptop, desktop, TV, digital signage, etc. It can be called.

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Abstract

Un exemple selon la présente invention concerne un procédé et/ou un appareil pour recevoir un signal dans un système WLAN. Une station d'utilisateur (STA d'utilisateur) selon la présente invention peut recevoir un signal comprenant un champ de commande spécifique à l'utilisateur pour une communication multiutilisateur (MU). Dans ce cas, le champ de commande spécifique à l'utilisateur peut comprendre : un premier champ d'informations concernant le nombre de flux spatiaux pour la station d'utilisateur (STA d'utilisateur) ; et un second champ d'informations comprenant des informations concernant la taille du premier champ d'informations. La station d'utilisateur selon la présente invention peut comprendre une étape de décodage d'un champ de données sur la base du champ de commande spécifique à l'utilisateur.
PCT/KR2019/010002 2018-08-09 2019-08-08 Procédé et appareil pour recevoir des informations concernant un flux spatial dans un système wlan WO2020032641A1 (fr)

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