WO2020145546A1 - Procédé et dispositif de transmission d'une ppdu eht dans un système lan sans fil - Google Patents

Procédé et dispositif de transmission d'une ppdu eht dans un système lan sans fil Download PDF

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Publication number
WO2020145546A1
WO2020145546A1 PCT/KR2019/018104 KR2019018104W WO2020145546A1 WO 2020145546 A1 WO2020145546 A1 WO 2020145546A1 KR 2019018104 W KR2019018104 W KR 2019018104W WO 2020145546 A1 WO2020145546 A1 WO 2020145546A1
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sequence
mhz
stf
tone
eht
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PCT/KR2019/018104
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English (en)
Korean (ko)
Inventor
윤선웅
최진수
임동국
김진민
박은성
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex 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

Definitions

  • the present specification relates to a technique for transmitting an EHT PPDU in a wireless LAN system, and more specifically, an EHT PPDU by setting an STF sequence having an optimal PAPR in a tone plan that repeats a tone plan for an 80 MHz band in a wireless LAN system. It relates to a method and apparatus for transmitting.
  • the wireless local area network has been improved in various ways.
  • the IEEE 802.11ax standard proposed an improved communication environment using orthogonal frequency division multiple access (OFDMA) and DL downlink multi-user multiple input (MIMO) techniques.
  • OFDMA orthogonal frequency division multiple access
  • MIMO DL downlink multi-user multiple input
  • the new communication standard may be an extreme high throughput (EHT) standard currently being discussed.
  • the EHT standard may use a newly proposed increased bandwidth, an improved PHY layer protocol data unit (PPDU) structure, an improved sequence, and a hybrid automatic repeat request (HARQ) technique.
  • the EHT standard may be referred to as the IEEE 802.11be standard.
  • an increased number of spatial streams can be used.
  • the signaling technique in the WLAN system may need to be improved.
  • This specification proposes a method and apparatus for transmitting an EHT PPDU in a wireless LAN system.
  • An example of this specification proposes a method for transmitting an EHT PPDU.
  • the next-generation wireless LAN system is an improved wireless LAN system that can satisfy backward compatibility with the 802.11ax system.
  • the next-generation wireless LAN system may support broadband to increase throughput.
  • the broadband includes 160MHz, 240MHz, and 320MHz bands (or 160+160MHz bands).
  • the STF sequence for obtaining the optimal PAPR in consideration of the tone plan for each band (configuration of all RUs in the wideband) Suggest.
  • This embodiment is performed by a transmitting STA, and the transmitting STA may correspond to an access point (AP).
  • the receiving STA of this embodiment may correspond to an STA supporting an Extreme High Throughput (EHT) wireless LAN system.
  • EHT Extreme High Throughput
  • the transmitting STA (station) generates a short training field (STF) signal for the 320 MHz band or the 160+160 MHz band.
  • STF short training field
  • the transmitting STA transmits the EHT PPDU including the STF signal to a receiving STA.
  • the STF signal is generated based on the EHT STF sequence for the 320 MHz band or 160+160 MHz band.
  • the EHT STF sequence for the 320 MHz band is defined as the first sequence in which a predetermined M sequence is repeated.
  • the predetermined M sequence is defined as follows.
  • M ⁇ -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1 ⁇
  • the predetermined M sequence is the same as the M sequence defined in 802.11ax.
  • the EHT PPDU is configured, thereby increasing the throughput and improving the overall system.
  • FIG. 1 shows an example of a transmitting device and/or a receiving device of the present specification.
  • WLAN wireless LAN
  • 3 is a diagram for explaining a general link setup process.
  • FIG. 4 is a diagram showing an example of a PPDU used in the IEEE standard.
  • FIG. 5 is a diagram showing the arrangement of a resource unit (RU) used on a 20MHz band.
  • RU resource unit
  • FIG. 6 is a view showing the arrangement of a resource unit (RU) used on the 40MHz band.
  • RU resource unit
  • FIG. 7 is a view showing the arrangement of a resource unit (RU) used on the 80MHz band.
  • RU resource unit
  • FIG. 11 shows an example of a trigger frame.
  • FIG. 13 shows an example of a sub-field included in a per user information field.
  • 16 shows an example of a channel used/supported/defined within a 5 GHz band.
  • FIG. 17 shows an example of a channel used/supported/defined within a 6 GHz band.
  • 19 shows a 1x HE-STF tone in PPDU transmission for each channel according to the present embodiment.
  • FIG. 20 shows an example of a 2x HE-STF tone in PPDU transmission for each channel according to the present embodiment.
  • 21 is a flowchart illustrating a procedure for transmitting an EHT PPDU in a transmitting STA according to this embodiment.
  • FIG. 22 is a flowchart illustrating a procedure for receiving an EHT PPDU at a receiving STA according to the present embodiment.
  • slash (/) or comma (comma) used in this specification may mean “and/or” (and/or).
  • A/B means “A and/or B”, and thus may mean “only A” or “only B” or “one of A and B”.
  • technical features that are individually described in one drawing may be individually or simultaneously implemented.
  • control information EHT-Signal
  • EHT-Signal EHT-Signal
  • EHT-signal EHT-signal
  • the following example of the present specification can be applied to various wireless communication systems.
  • the following example of the present specification may be applied to a wireless local area network (WLAN) system.
  • WLAN wireless local area network
  • this specification may be applied to the IEEE 802.11a/g/n/ac standard, or the IEEE 802.11ax standard.
  • the present specification can be applied to the newly proposed EHT standard or IEEE 802.11be standard.
  • an example of the present specification may be applied to a new wireless LAN standard that improves the EHT standard or IEEE 802.11be.
  • FIG. 1 shows an example of a transmitting device and/or a receiving device of the present specification.
  • STA includes two stations (STA).
  • STA (110, 120) is a mobile terminal (mobile terminal), a wireless device (wireless device), a wireless transmit/receive unit (WTRU), user equipment (User Equipment; UE), mobile station (Mobile Station; MS) , It can also be called various names such as a mobile subscriber unit or simply a user.
  • the STAs 110 and 120 may be called various names such as a receiving device, a transmitting device, a receiving STA, a transmitting STA, a receiving device, and a transmitting device.
  • the STAs 110 and 120 may perform an access point (AP) role or a non-AP role. That is, the STAs 110 and 120 of the present specification may perform functions of an AP and/or a non-AP.
  • AP access point
  • non-AP non-AP
  • the STAs 110 and 120 of the present specification may support various communication standards other than the IEEE 802.11 standard. For example, it may support a communication standard (eg, LTE, LTE-A, 5G NR standard) according to the 3GPP standard. Also, the STA of the present specification may be implemented with various devices such as a mobile phone, a vehicle, and a personal computer.
  • a communication standard eg, LTE, LTE-A, 5G NR standard
  • 3GPP 3rd Generation
  • the STA of the present specification may be implemented with various devices such as a mobile phone, a vehicle, and a personal computer.
  • the STAs 110 and 120 may include a medium access control (MAC) compliant with the IEEE 802.11 standard and a physical layer interface to a wireless medium.
  • MAC medium access control
  • 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, an IEEE 802.11 packet (eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.) can be transmitted and received.
  • IEEE 802.11a/b/g/n/ac/ax/be, etc. can be transmitted and received.
  • the first STA 110 may perform an intended operation of the AP.
  • the processor 111 of the AP may receive a signal through the transceiver 113, process 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 (ie, a transmitted signal) to be transmitted through the transceiver.
  • the second STA 120 may perform an intended operation of the Non-AP STA.
  • the non-AP transceiver 123 performs a signal transmission/reception operation.
  • an IEEE 802.11 packet eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.
  • IEEE 802.11a/b/g/n/ac/ax/be, etc. can be transmitted and received.
  • the processor 121 of the Non-AP STA may receive a signal through the transceiver 123, process 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 transmitted signal) to be transmitted through the transceiver.
  • the operation of the device indicated by the AP in the following specification may be performed in the first STA 110.
  • the operation of the device indicated by the AP is controlled by the processor 111 of the first STA 110, and a related signal is transmitted or received through the transceiver 113 controlled by the processor 111 of the first STA 110.
  • control information related to the operation of the AP or the transmission/reception signal of the AP may be stored in the memory 112 of the first STA 110.
  • the operation of the device indicated as non-AP in the following specification may be performed in 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 a related signal is transmitted through the transceiver 123 controlled by the processor 121 of the second STA 120. Or it can be received.
  • control information related to the operation of the non-AP or the transmission/reception signal of the AP may be stored in the memory 212 of the second STA 120.
  • WLAN wireless LAN
  • 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
  • the wireless LAN system may include one or more infrastructure BSSs 200 and 205 (hereinafter, BSS).
  • BSS (200, 205) is a set of APs and STAs, such as an access point (AP) and STA1 (Station, 200-1) that can successfully communicate with each other through synchronization, and does not indicate a specific area.
  • the BSS 205 may include one or more combineable STAs 205-1 and 205-2 in one AP 230.
  • the BSS may include at least one STA, APs 225 and 230 providing a distributed service, and a distributed system (DS, 210) connecting multiple APs.
  • DS distributed system
  • the distributed system 210 may connect multiple BSSs 200 and 205 to implement an extended service set (ESS) 240.
  • ESS 240 may be used as a term indicating one network formed by connecting one or several APs through the distributed system 210.
  • APs included in one ESS 240 may have the same service set identification (SSID).
  • the portal 220 may serve as a bridge that performs a connection between a WLAN network (IEEE 802.11) and another network (eg, 802.X).
  • IEEE 802.11 IEEE 802.11
  • 802.X another network
  • a network between APs 225 and 230 and a network between APs 225 and 230 and STAs 200-1, 205-1 and 205-2 may be implemented.
  • a network that establishes a network between STAs without APs 225 and 230 to perform communication is defined as an ad-hoc network or an independent basic service set (BSS).
  • FIG. 2 is a conceptual diagram showing the IBSS.
  • 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 management functions centrally. That is, STAs 250-1, 250-2, 250-3, 255-4, and 255-5 in IBSS are managed in a distributed manner. In IBSS, all STAs (250-1, 250-2, 250-3, 255-4, 255-5) may be made of mobile STAs, and access to a distributed system is not allowed, so a self-contained network (self-contained) network).
  • 3 is a diagram for explaining 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 is necessary to find a network that can participate.
  • the STA must identify a compatible network before participating in a wireless network, and 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 search for which AP exists in the vicinity while moving channels.
  • the responder transmits a probe response frame to the STA that has transmitted the probe request frame in response to the probe request frame.
  • the responder may be the STA that last transmitted the beacon frame (beacon frame) in the BSS of the channel being scanned.
  • the AP since the AP transmits the beacon frame, the AP becomes a responder, and in the IBSS, the STAs in the IBSS rotate and transmit the beacon frame, so the responder is not constant.
  • an STA that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 stores BSS-related information included in the received probe response frame and then transmits the next channel (for example, number 2).
  • Channel to scan (ie, probe request/response transmission/reception on channel 2) in the same manner.
  • the scanning operation may be performed by a passive scanning method.
  • An STA performing scanning based on passive scanning may wait for a beacon frame while moving channels.
  • the beacon frame is one of the management frames in IEEE 802.11, and is transmitted periodically to inform the presence of the wireless network and allow STAs performing scanning to find the wireless network and participate in the wireless network.
  • the AP serves to periodically transmit the beacon frame
  • STAs in the IBSS rotate and transmit the beacon frame.
  • the STA performing scanning stores information on the BSS included in the beacon frame and records beacon frame information in each channel while moving to another channel.
  • the STA receiving the beacon frame may store BSS-related information included in the received beacon frame and move to the next channel to perform scanning in the next channel in the same manner.
  • the STA discovering the network may perform an authentication process through step SS320. Such an authentication process may be referred to as a first authentication process in order to clearly distinguish the security setup operation of step S340 described later.
  • the authentication process in S320 may include a process in which the STA transmits an authentication request frame to the AP, and in response, the AP sends an authentication response frame to the STA.
  • the authentication frame used for authentication request/response corresponds to a management frame.
  • the authentication frame includes the authentication algorithm number, authentication transaction sequence number, status code, challenge text, robust security network (RSN), and finite cycle group (Finite Cyclic). Group).
  • the STA may transmit an authentication request frame to the AP.
  • the AP may determine whether to allow authentication for the corresponding STA based on the information included in the received authentication request frame.
  • the AP may provide the result of the authentication process to the STA through the authentication response frame.
  • the successfully authenticated STA may perform a connection process based on step S330.
  • the connection process includes a process in which the STA transmits an association request frame to the AP, and in response, the AP transmits an association response frame to the STA.
  • the connection request frame includes information related to various capabilities, beacon listening interval, service set identifier (SSID), supported rates, supported channels, RSN, and mobility domain. , Supported operating classes, TIM broadcast request, and information on interworking service capabilities.
  • connection response frame includes information related to various capabilities, status codes, association ID (AID), support rate, enhanced distributed channel access (EDCA) parameter set, received channel power indicator (RCPI), and received signal to noise (RSNI) Indicator), mobility domain, timeout interval (association comeback time (association comeback time)), overlapping (overlapping) BSS scan parameters, TIM broadcast response, QoS map, and other information.
  • AID association ID
  • EDCA enhanced distributed channel access
  • RCPI received channel power indicator
  • RSNI received signal to noise
  • mobility domain timeout interval (association comeback time (association comeback time)), overlapping (overlapping) BSS scan parameters, TIM broadcast response, QoS map, and other information.
  • step S340 the STA may perform a security setup process.
  • the security setup process of step S340 may include, for example, a process of performing a private key setup through 4-way handshaking through an Extensible Authentication Protocol over LAN (EAPOL) frame. .
  • EAPOL Extensible Authentication Protocol over LAN
  • FIG. 4 is a diagram showing an example of a PPDU used in the IEEE standard.
  • PHY protocol data units As illustrated, various types of PHY protocol data units (PPDUs) have been used in standards such as IEEE a/g/n/ac. Specifically, the LTF and STF fields included a training signal, and SIG-A and SIG-B included control information for a receiving station, and the data field contained user data corresponding to a PSDU (MAC PDU/Aggregated MAC PDU). Was included.
  • PPDUs PHY protocol data units
  • the HE PPDU according to FIG. 4 is an example of a PPDU for multiple users, and the HE-SIG-B is included only for multiple users, and the corresponding HE-SIG-B may be omitted in the PPDU for a single user.
  • HE-PPDU for multiple users is a legacy-short training field (L-STF), legacy-long training field (L-LTF), 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) , Data field (or MAC payload) and PE (Packet Extension) field.
  • 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-short training field
  • HE-LTF high efficiency-long training field
  • PE Packet Extension
  • the resource unit may include a plurality of subcarriers (or tones).
  • the resource unit may be used when transmitting signals to multiple STAs based on the OFDMA technique. Also, when transmitting a signal to one STA, a resource unit may be defined.
  • the resource unit can be used for STF, LTF, data field, etc.
  • FIG. 5 is a diagram showing the arrangement of a resource unit (RU) used on a 20MHz 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. For example, resources may be allocated in units of RU shown for HE-STF, HE-LTF, and data fields.
  • 26-units i.e., units corresponding to 26 tones
  • Six tones may be used as a guard band in the leftmost band of the 20 MHz band, and five tones may be used as a guard band in the rightmost band of the 20 MHz band.
  • 7 DC tones are inserted into the central band, that is, the DC band, and 26-units corresponding to each of 13 tones may exist to the left and right of the DC band.
  • 26-units, 52-units, and 106-units may be allocated to other bands.
  • Each unit can be assigned for a receiving station, ie a user.
  • the RU arrangement of FIG. 5 is utilized not only for a situation for multiple users (MU), but also for a situation for single users (SU).
  • MU multiple users
  • SU single users
  • one 242-unit is used. It is possible to use and in this case 3 DC tones can be inserted.
  • FIG. 6 is a view showing the arrangement of a resource unit (RU) used on the 40MHz band.
  • RU resource unit
  • examples of FIG. 6 may also be 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, and the like.
  • 5 DC tones can 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 a rightmost band of the 40 MHz band. It can be used as a guard band.
  • 484-RU when used for a single user, 484-RU can be used. Meanwhile, the fact that the specific number of RUs can be changed is the same as the example of FIG. 4.
  • FIG. 7 is a view showing the arrangement of a resource unit (RU) used on the 80MHz band.
  • RU resource unit
  • examples of FIG. 7 may also be used of 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. have.
  • 7 DC tones can be inserted into the center frequency, 12 tones are used in the leftmost band of the 80 MHz band as a guard band, and 11 tones are located in the rightmost band of the 80 MHz band. It can be used as a guard band.
  • 26-RUs using 13 tones located on the left and right sides of the DC band can be used.
  • 996-RU when used for a single user, 996-RU can be used, in which case 5 DC tones can be inserted.
  • the RU arrangement (ie, RU location) illustrated in FIGS. 5 to 7 may be applied to a new wireless LAN system (eg, an EHT system) as it is.
  • a new wireless LAN system eg, an EHT system
  • the arrangement of the RU for 80 MHz is repeated twice or the arrangement of the RU for 40 MHz (that is, the example of FIG. 6) is 4 times It can be repeated.
  • the arrangement of the RU for 80 MHz (example of FIG. 7) may be repeated 4 times or the arrangement of the RU for 40 MHz (ie, example of FIG. 6) may be repeated 8 times. have.
  • One RU of the present specification may be allocated for only one STA (eg, non-AP). Or, a plurality of RUs may be allocated for one STA (eg, non-AP).
  • the RU described herein may be used for UL (Uplink) communication and DL (Downlink) communication.
  • the transmitting STA eg, AP
  • the second STA may be allocated a second RU (for example, 26/52/106/242-RU).
  • the first STA may transmit the first Trigger-based PPDU based on the first RU
  • the second STA may transmit the second Trigger-based PPDU based on the second RU.
  • the first/second trigger-based PPDU is transmitted to the AP in the same time period.
  • the transmitting STA (eg, AP) allocates a first RU (eg, 26/52/106/242-RU, etc.) to the first STA, and A second RU (for example, 26/52/106/242-RU, etc.) may be allocated to the 2 STAs. That is, the transmitting STA (for example, the AP) can transmit the HE-STF, HE-LTF, and Data fields for the first STA through the first RU in one MU PPDU, and the second STA through the second RU. The HE-STF, HE-LTF, and Data fields for 2 STAs may be transmitted.
  • a first RU eg, 26/52/106/242-RU, etc.
  • a second RU for example, 26/52/106/242-RU, etc.
  • the 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 810 includes a common field 820 and a user-specific field 830.
  • the common field 820 may include information commonly applied to all users (ie, user STAs) receiving SIG-B.
  • the user-individual field 830 may be referred to as a user-individual control field.
  • the user-individual field 830 may be applied to only some of a plurality of users when SIG-B is delivered to a plurality of users.
  • the common field 920 and the user-individual field 930 may be separately encoded.
  • the common field 920 may include N*8 bits of RU allocation information.
  • 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. 5, the RU allocation information may include information on which RU (26-RU/52-RU/106-RU) is arranged in which frequency band. .
  • up to nine 26-RUs may be allocated to a 20 MHz channel.
  • the RU allocation information of the common field 820 is set as '00000000' as shown in Table 8
  • nine 26-RUs may be allocated to the corresponding channel (ie, 20 MHz).
  • the RU allocation information of the common field 820 is set as '00000001'
  • seven 26-RU and one 52-RU are arranged in corresponding channels. That is, in the example of FIG. 5, 52-RU is allocated on the rightmost side and 7 26-RU are allocated on the left side.
  • Table 1 shows only a part of RU locations that can be displayed by RU allocation information.
  • the RU allocation information may further include an example of Table 2 below.
  • “01000y2y1y0” is related to an example in which 106-RU is allocated to the left-most side of a 20 MHz channel, and 5 26-RU are allocated to the right.
  • a number of STAs (eg, User-STA) may be allocated to the 106-RU based on the MU-MIMO technique.
  • up to 8 STAs (eg, User-STA) may be allocated, and the number of STAs (eg, User-STA) allocated to the 106-RU is 3 bit information (y2y1y0) ).
  • the 3-bit information (y2y1y0) is set to N
  • the number of STAs (eg, User-STA) allocated to the 106-RU based on the MU-MIMO technique may be N+1.
  • a plurality of different STAs may be assigned to a plurality of RUs.
  • a plurality of STAs may be allocated based on the MU-MIMO technique.
  • the user-individual field 830 may include a plurality of user fields.
  • the number of STAs (eg, User STAs) allocated to a specific channel may be determined based on RU allocation information of the common field 820. For example, when the RU allocation information of the common field 820 is '00000000', one user STA may be allocated to each of the nine 26-RUs (that is, a total of nine user STAs are allocated). That is, up to 9 User STAs may be allocated to a specific channel through OFDMA. In other words, up to 9 User STAs may be assigned to a specific channel through a non-MU-MIMO technique.
  • a plurality of User STAs are allocated through the MU-MIMO technique to 106-RUs disposed at the left-most side, and five 26-RUs disposed at the right side thereof
  • Five user STAs may be allocated through a non-MU-MIMO technique. This case is embodied through the example of FIG. 9.
  • RU allocation is set to “01000010” as shown in FIG. 9, based on Table 2, 106-RU is allocated to the left-most of a specific channel and 5 26-RU are allocated to the right. Can.
  • a total of three User STAs can be allocated to the 106-RU through the MU-MIMO technique.
  • the user-individual field 830 of HE-SIG-B may include 8 User fields.
  • Eight User fields may be included in the order shown in FIG. 9. Also, as illustrated in FIG. 8, two user fields may be implemented as one user block field.
  • the user fields illustrated in FIGS. 8 and 9 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. Referring to the example of FIG. 9, User fields 1 to User field 3 may be based on the first format, and User fields 4 to User Field 8 may be based on the second format.
  • the first format or the second format may include bit information of the same length (for example, 21 bits).
  • the transmitting STA may perform channel access through contending (ie, backoff operation) and transmit a trigger frame 1030. That is, the transmitting STA (eg, AP) may transmit the PPDU including the Trigger Frame 1330.
  • a trigger-based (TB) PPDU is transmitted after a delay of SIFS.
  • TB PPDUs 1041 and 1042 may be transmitted at the same time, and may be transmitted from a plurality of STAs (eg, User STAs) in which an AID is indicated in Trigger frame 1030.
  • STAs eg, User STAs
  • the ACK frame 1050 for the TB PPDU may be implemented in various forms.
  • an orthogonal frequency division multiple access (OFDMA) technique or a MU MIMO technique may be used, and OFDMA and MU MIMO techniques may be used simultaneously.
  • OFDMA orthogonal frequency division multiple access
  • the trigger frame of FIG. 11 allocates resources for uplink multiple-user transmission (MU) transmission, and may be transmitted from an AP, for example.
  • the trigger frame may consist of a MAC frame and may be included in the PPDU.
  • Each field illustrated in FIG. 11 may be partially omitted, and other fields may be added. Also, the length of each field may be changed differently from that shown.
  • the frame control field 1110 of FIG. 11 includes information on the version of the MAC protocol and other additional control information, and the duration field 1120 is time information for NAV setting or an identifier of the STA (eg For example, AID) may be included.
  • the RA field 1130 includes address information of a receiving STA of a corresponding trigger frame, and may be omitted if necessary.
  • the TA field 1140 includes address information of an STA (eg, AP) that transmits the trigger frame, and the common information field 1150 is applied to a receiving STA that receives the trigger frame.
  • the field indicating the length of the L-SIG field of the uplink PPDU transmitted corresponding to the trigger frame or the SIG-A field of the uplink PPDU transmitted corresponding to the trigger frame ie, HE-SIG-A Field
  • the common control information information on the length of the CP of the uplink PPDU transmitted corresponding to the trigger frame or information on the length of the LTF field may be included.
  • the individual user information field may be referred to as an “assignment field”.
  • the trigger frame of FIG. 11 may include a padding field 1170 and a frame check sequence field 1180.
  • Each of the individual user information (per user information) fields 1160#1 to 1160#N shown in FIG. 11 may include a plurality of sub-fields again.
  • FIG. 12 shows an example of a common information field of a trigger frame. Some of the subfields of FIG. 12 may be omitted, and other subfields may be added. Also, the length of each of the illustrated sub-fields can be changed.
  • the illustrated length field 1210 has the same value as the length field of the L-SIG field of the uplink PPDU transmitted corresponding to the corresponding trigger frame, and the length field of the L-SIG field of the uplink PPDU indicates the length of the uplink PPDU.
  • the length field 1210 of the trigger frame can be used to indicate the length of the corresponding uplink PPDU.
  • cascade indicator field 1220 indicates whether a cascade operation is performed.
  • Cascade operation means that downlink MU transmission and uplink MU transmission are performed together in the same TXOP. That is, after the downlink MU transmission is performed, it means that the uplink MU transmission is performed after a predetermined time (for example, SIFS).
  • a predetermined time for example, SIFS.
  • AP transmission device
  • a plurality of transmission devices eg, non-AP
  • the CS request field 1230 indicates whether a state of a radio medium or NAV should be considered in a situation in which a receiving device receiving a corresponding trigger frame transmits a corresponding uplink PPDU.
  • the HE-SIG-A information field 1240 may include information that controls the content of the SIG-A field (ie, the HE-SIG-A field) of the uplink PPDU transmitted corresponding to the trigger frame.
  • the CP and LTF type field 1250 may include information on the length and CP length of the LTF of the uplink PPDU transmitted in response to the corresponding trigger frame.
  • the trigger type field 1060 may indicate the purpose for which the corresponding trigger frame is used, for example, normal triggering, triggering for beamforming, request for Block ACK/NACK, and the like.
  • the trigger type field 1260 of the trigger frame indicates a basic type trigger frame for normal triggering.
  • a basic type trigger frame may be referred to as a basic trigger frame.
  • the user information field 1300 of FIG. 13 shows an example of a sub-field included in a per user information field.
  • the user information field 1300 of FIG. 13 may be understood as any one of the individual user information fields 1160#1 to 1160#N mentioned in FIG. 11. Some of the sub-fields included in the user information field 1300 of FIG. 13 may be omitted, and other sub-fields may be added. Also, the length of each of the illustrated sub-fields can be changed.
  • the user identifier (User Identifier) field 1310 of FIG. 13 indicates an identifier of an STA (ie, a receiving STA) corresponding to per user information, and an example of the identifier is an association identifier (AID) of the receiving STA It can be all or part of the value.
  • a RU Allocation field 1320 may be included. That is, when the receiving STA identified by the user identifier field 1310 transmits the TB PPDU in response to the trigger frame, the TB PPDU is transmitted through the RU indicated by the RU allocation field 1320.
  • the RU indicated by the RU Allocation field 1320 may be the RU shown in FIGS. 5, 6, and 7.
  • the subfield of FIG. 13 may include a coding type field 1330.
  • the coding type field 1330 may indicate a coding type of TB PPDU. For example, when BCC coding is applied to the TB PPDU, the coding type field 1330 is set to '1', and when LDPC coding is applied, the coding type field 1330 can be set to '0'. have.
  • the sub-field of FIG. 13 may include an MCS field 1340.
  • the MCS field 1340 may indicate an MCS technique applied to TB PPDU. For example, when BCC coding is applied to the TB PPDU, the coding type field 1330 is set to '1', and when LDPC coding is applied, the coding type field 1330 can be set to '0'. have.
  • the transmitting STA may allocate 6 RU resources as illustrated in FIG. 14 through a trigger frame.
  • the AP includes first RU resources (AID 0, RU 1), second RU resources (AID 0, RU 2), third RU resources (AID 0, RU 3), and fourth RU resources (AID 2045, RU) 4), the fifth RU resource (AID 2045, RU 5), the sixth RU resource (AID 3, RU 6) can be allocated.
  • Information regarding AID 0, AID 3, or AID 2045 may be included in the user identification field 1310 of FIG. 13, for example.
  • Information about RU 1 to RU 6 may be included in the RU allocation field 1320 of FIG. 13, for example.
  • the first to third RU resources of FIG. 14 may be used as a UORA resource for an associated STA
  • the fourth to fifth RU resources of FIG. 14 for an un-associated STA It may be used as a UORA resource
  • the sixth RU resource of FIG. 14 may be used as a resource for a normal UL MU.
  • the ODMA (OFDMA random access BackOff) counter of STA1 is decreased to 0, so that STA1 randomly selects the second RU resources (AID 0, RU 2).
  • the OBO counter of STA2/3 is greater than 0, uplink resources are not allocated to STA2/3.
  • STA1 in FIG. 14 is an associated STA, there are a total of 3 eligible RA RUs for STA1 (RU 1, RU 2, and RU 3), and accordingly, STA1 decreases the OBO counter by 3, resulting in an OBO counter. It became zero.
  • STA2 in FIG. 14 is an associated STA, there are a total of 3 eligible RA RUs for STA2 (RU 1, RU 2, RU 3), and accordingly, STA2 reduces the OBO counter by 3, but the OBO counter is 0. It is in a larger state.
  • STA3 in FIG. 14 is a non-associated STA, there are a total of 2 eligible RA RUs for STA3 (RU 4, RU 5), and accordingly, STA3 reduces the OBO counter by 2, but the OBO counter is It is greater than zero.
  • the 2.4 GHz band may be referred to by other names such as the first band (band).
  • 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 include multiple 20 MHz channels.
  • 20 MHz in the 2.4 GHz band may have multiple channel indices (eg, index 1 to index 14).
  • the center frequency of a 20 MHz channel to which channel index 1 is allocated may be 2.412 GHz
  • the center frequency of a 20 MHz channel to which channel index 2 is allocated may be 2.417 GHz
  • the 20 MHz to which channel index N is allocated The center frequency of the channel may be (2.407 + 0.005*N) GHz.
  • the channel index may be called various names such as a channel number. The specific values of the channel index and the center frequency can be changed.
  • the illustrated first frequency domain 1510 to the fourth frequency domain 1540 may each include one channel.
  • the first frequency domain 1510 may include a channel 1 (a 20 MHz channel having an index 1).
  • the center frequency of channel 1 may be set to 2412 MHz.
  • the second frequency domain 1520 may include channel 6.
  • the center frequency of channel 6 may be set to 2437 MHz.
  • the third frequency domain 1530 may include channel 11.
  • the center frequency of the channel 11 may be set to 2462 MHz.
  • the fourth frequency domain 1540 may include channel 14. At this time, the center frequency of the channel 14 may be set to 2484 MHz.
  • 16 shows an example of a channel used/supported/defined within a 5 GHz band.
  • the 5 GHz band may be referred to by other names such as the second band/band.
  • the 5 GHz band may refer to a frequency range in which channels having a center frequency of 5 GHz or more and less than 6 GHz (or less than 5.9 GHz) are used/supported/defined.
  • the 5 GHz band may include a plurality of channels between 4.5 GHz and 5.5 GHz. The specific numerical values shown in FIG. 16 may be changed.
  • the plurality of channels in the 5 GHz band includes UNII (Unlicensed National Information Infrastructure)-1, UNII-2, UNII-3, and ISM.
  • UNII-1 can be called UNII Low.
  • UNII-2 may include frequency domains called UNII Mid and UNII-2Extended.
  • UNII-3 can be called UNII-Upper.
  • Multiple 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 range/range in UNII-1 and UNII-2 may be divided into eight 20 MHz channels.
  • the 5170 MHz to 5330 MHz frequency domain/range can be divided into four 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.
  • FIG. 17 shows an example of a channel used/supported/defined within a 6 GHz band.
  • the 6 GHz band may be referred to by other names such as third band/band.
  • the 6 GHz band may mean a frequency domain in which channels with a center frequency of 5.9 GHz or higher are used/supported/defined.
  • the specific numerical values shown in FIG. 17 may be changed.
  • the 20 MHz channel in FIG. 17 may be defined from 5.940 GHz.
  • the left-most channel of the 20 MHz channel of FIG. 17 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 index N channel may be determined as (5.940 + 0.005*N) GHz.
  • the index (or channel number) of the 20 MHz channel in FIG. 17 is 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61, 65, 69, 73, 77, 81, 85, 89, 93, 97, 101, 105, 109, 113, 117, 121, 125, 129, 133, 137, 141, 145, 149, 153, 157, 161, 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. 17 is 3, 11, 19, 27, 35, 43, 51, 59, 67, 75, 83, 91, 99, 107, 115, 123, 131, 139, 147, 155, 163, 171, 179, 187, 195, 203, 211, 219, 227.
  • the PPDU of FIG. 18 may be called various names such as an EHT PPDU, a transmitting PPDU, a receiving PPDU, a first type or an N-type PPDU.
  • EHT PPDU transmitting PPDU
  • receiving PPDU receives a packet data packet
  • N-type PPDU receives a packet data packet
  • it can be used in a new wireless LAN system with an improved EHT system and/or an EHT system.
  • the sub-field of FIG. 18 may be changed to various names.
  • the SIG A field may be called an EHT-SIG-A field
  • the SIG B field an EHT-SIG-B
  • the STF field an EHT-STF field
  • the LTF field an EHT-LTF field.
  • the subcarrier spacing of the L-LTF, L-STF, L-SIG, and RL-SIG fields of FIG. 18 may be set to 312.5 kHz, and the subcarrier spacing of the STF, LTF, and Data fields may be set to 78.125 kHz. That is, the subcarrier index of the L-LTF, L-STF, L-SIG, and RL-SIG fields may be displayed in 312.5 kHz units, and the subcarrier index of the STF, LTF, and Data fields may be displayed in 78.125 kHz units.
  • the SIG A and/or SIG B fields of FIG. 18 may include additional fields (eg, SIG C or one control symbol, etc.).
  • the subcarrier spacing of all/part of the SIG A and SIG B fields may be set to 312.5 kHz, and the subcarrier spacing of the remaining portions may be set to 78.125 kHz.
  • the PPDU of FIG. 18 may have the same L-LTF and L-STF fields.
  • the L-SIG field of FIG. 18 may include, for example, 24-bit bit information.
  • the 24-bit information may include a rate field of 4 bits, a reserved bit of 1 bit, a length field of 12 bits, a parity bit of 1 bit, and a tail bit of 6 bits.
  • the 12-bit Length field may include information on the number of octets of the PSDU (Physical Service Data Unit).
  • the value of the 12-bit Length field may be determined based on the type of PPDU. For example, if the PPDU is a non-HT, HT, VHT PPDU or an EHT PPDU, the value of the Length field may be determined in multiples of 3.
  • the value of the Length field may be determined as “multiple of 3 + 1” or “multiple of 3 +2”.
  • the value of the Length field can be determined as a multiple of 3 for non-HT, HT, VHT PPDU or EHT PPDU, and the value of the Length field for HE PPDU is a multiple of 3 + 1 or multiple of 3 +2”.
  • the transmitting STA may apply BCC encoding based on a code rate of 1/2 to the 24-bit information of the L-SIG field. Thereafter, the transmitting STA may acquire 48 bits of BCC encoded bits. For the 48-bit coded bit, BPSK modulation may be applied to generate 48 BPSK symbols. The transmitting STA may map 48 BPSK symbols to positions excluding pilot subcarriers ⁇ subcarrier index -21, -7, +7, +21 ⁇ and DC subcarrier ⁇ subcarrier index 0 ⁇ .
  • the transmitting STA may further map the signals of ⁇ -1, -1, -1, 1 ⁇ to the subcarrier index ⁇ -28, -27, +27, 28 ⁇ .
  • the above signal can be used for channel estimation for a frequency domain corresponding to ⁇ -28, -27, +27, 28 ⁇ .
  • the transmitting STA may generate the RL-SIG generated in the same way as the L-SIG. BPSK modulation is applied to RL-SIG.
  • the receiving STA can know that the received PPDU is an HE PPDU or an EHT PPDU based on the presence of the RL-SIG.
  • EHT-SIG-A or one control symbol may be inserted.
  • the symbol (i.e., EHT-SIG-A or one control symbol) contiguous to the RL-SIG may include 26 bits of information, and may include information for identifying the type of the EHT PPDU.
  • EHT PPDU type information may be included in a symbol subsequent to RL-SIG.
  • Symbols subsequent to the RL-SIG may include, for example, information about the length of the TXOP and information about the BSS color ID.
  • the SIG-A field may be configured in succession to a symbol (eg, one control symbol) consecutive to the RL-SIG.
  • a symbol subsequent to RL-SIG may be a SIG-A field.
  • the SIG-A field is 1) a DL/UL indicator, 2) a BSS color field that is an identifier of a BSS, 3) a field including information on the remaining time of the current TXOP section, 4) a bandwidth.
  • Bandwidth field including information
  • 5) Field including information on MCS technique applied to SIG-B 6) Contains information related to whether dual subcarrier modulation technique is applied to SIG-B Indication field, 7) a field including information on the number of symbols used for SIG-B, 8) a field including information on whether SIG-B is generated over the entire band, 9) LTF/STF Field including information on the type of 10, and information on a field indicating the length of the LTF and the length of the CP.
  • the STF of FIG. 18 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or OFDMA environment.
  • the LTF of FIG. 18 can be used to estimate a channel in a MIMO environment or an OFDMA environment.
  • the STF of FIG. 18 can be set to various types.
  • a first type that is, 1x STF
  • the STF signal generated based on the first type STF sequence may have a period of 0.8 ⁇ s, and the period signal of 0.8 ⁇ s may be repeated 5 times to become a first type STF having a length of 4 ⁇ s.
  • a second type that is, 2x STF
  • a second type that is, 2x STF
  • STF among STFs may be generated based on a second type STF sequence in which non-zero coefficients are arranged at eight subcarrier intervals.
  • the STF signal generated based on the second type STF sequence may have a period of 1.6 ⁇ s, and the period signal of 1.6 ⁇ s may be repeated 5 times to become a second type EHT-STF having a length of 8 ⁇ s.
  • a third type ie, 4x EHT-STF
  • the STF signal generated based on the third type STF sequence may have a period of 3.2 ⁇ s, and the period signal of 3.2 ⁇ s may be repeated 5 times to become a third type EHT-STF having a length of 16 ⁇ s.
  • the EHT-LTF field may have first, second, and third types (ie, 1x, 2x, 4x LTF).
  • the first/second/third type LTF field may be generated based on an LTF sequence in which non-zero coefficients are arranged at 4/2/1 subcarrier intervals.
  • the first/second/third type LTF may have a time length of 3.2/6.4/12.8 ⁇ s.
  • various lengths of GI eg, 0.8/1/6/3.2 ⁇ s may be applied to the first/second/third type LTF.
  • Information about the type of STF and/or LTF may be included in the SIG A field and/or SIG B field of FIG. 18.
  • the PPDU of FIG. 18 may be identified as an EHT PPDU based on the following method.
  • the receiving STA may determine the type of the received PPDU as the EHT PPDU based on the following. 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 length of the L-SIG of the received PPDU. When the result of applying “modulo 3” to the value is detected as “0”, the received PPDU may be determined as the EHT PPDU. When the received PPDU is determined to be the EHT PPDU, the receiving STA is based on the bit information included in the symbol after RL-SIG in FIG.
  • the receiving STA is 1) the first symbol after the L-LTF signal, which is the BSPK, 2) the result of applying RL-SIG identical to the L-SIG in the L-SIG field and 3) “modulo 3”. Based on the L-SIG including the Length field set to “0”, the received PPDU can be determined as the EHT PPDU.
  • the receiving STA may determine the type of the received PPDU as HE PPDU based on the following. For example, 1) the first symbol after the L-LTF signal is BPSK, 2) the RL-SIG where the L-SIG is repeated is detected, and 3) “modulo 3” is applied to the length value of the L-SIG. When the result is detected as “1” or “2”, the received PPDU may be determined as the HE PPDU.
  • the receiving STA may determine the type of the received PPDU as non-HT, HT and VHT PPDU based on the following. For example, 1) the first symbol after the L-LTF signal is BPSK, 2) the RL-SIG in which the L-SIG is repeated is not detected, and 3) the receiving STA determines that it is not 802.11ax, and transmits the legacy STA. It operates as a state machine to determine, and determines the constellation of two symbols received after the L-SIG. Accordingly, the received PPDU may be determined as non-HT, HT and VHT PPDU.
  • STF sequence (or STF signal)
  • the main purpose of the HE-STF field is to improve automatic gain control estimation in MIMO transmission.
  • FIG. 19 shows a 1x HE-STF tone in PPDU transmission for each channel according to the present embodiment. More specifically, FIG. 19 illustrates an HE-STF tone (ie, 16-tone sampling) having a period of 0.8 Hz in a 20 MHz/40 MHz/80 MHz bandwidth. Therefore, HE-STF tones for each bandwidth (or channel) in FIG. 19 may be located at intervals of 16 tones.
  • HE-STF tone ie, 16-tone sampling
  • the x-axis represents a frequency domain.
  • the number on the x-axis indicates the index of the tone, and the arrow indicates that a non-zero value is mapped to the corresponding tone index.
  • Figure 19 (a) shows an example of a 1x HE-STF tone in a 20MHz PPDU transmission.
  • the 1x HE-STF sequence is a tone index from -112 to 112 Among the tones having, it is mapped to a tone having a tone index that is a multiple of 16 excluding DC, and 0 can be mapped to the remaining tones. That is, a 1x HE-STF tone in a 20MHz channel may be located in a tone index that is a multiple of 16 excluding DC among tones having a tone index from -112 to 112. Accordingly, a total of 14 1x HE-STF tones to which a 1x HE-STF sequence is mapped may exist in a 20MHz channel.
  • Figure 2(b) shows an example of a 1x HE-STF tone in a 40MHz PPDU transmission.
  • the 1x HE-STF sequence is a tone index from -240 to 240 Among the tones having, it is mapped to a tone having a tone index that is a multiple of 16 excluding DC, and 0 can be mapped to the remaining tones. That is, a 1x HE-STF tone in a 40MHz channel may be located in a tone index that is a multiple of 16 excluding DC among tones having a tone index from -240 to 240. Therefore, a total of 30 1x HE-STF tones to which a 1x HE-STF sequence is mapped may exist in a 40MHz channel.
  • Figure (c) shows an example of a 1x HE-STF tone in an 80MHz PPDU transmission.
  • the 1x HE-STF sequence is a tone index from -496 to 496 Among the tones having, it is mapped to a tone having a tone index that is a multiple of 16 excluding DC, and 0 can be mapped to the remaining tones. That is, a 1x HE-STF tone in an 80 MHz channel may be located at a tone index that is a multiple of 16 excluding DC among tones having a tone index from -496 to 496. Accordingly, a total of 62 1x HE-STF tones to which a 1x HE-STF sequence is mapped may exist in an 80MHz channel.
  • FIG. 20 shows an example of a 2x HE-STF tone in PPDU transmission for each channel according to the present embodiment. More specifically, FIG. 20 illustrates an HE-STF tone (ie, 8-tone sampling) having a period of 1.6 Hz in a 20 MHz/40 MHz/80 MHz bandwidth. Accordingly, HE-STF tones for each bandwidth (or channel) in FIG. 14 may be located at intervals of eight tones.
  • the 2x HE-STF signal according to FIG. 20 can be applied to an uplink MU PPDU. That is, the 2x HE-STF signal shown in FIG. 20 may be included in the PPDU transmitted through the uplink corresponding to the above-described trigger frame.
  • the x-axis represents a frequency domain.
  • the number on the x-axis indicates the index of the tone, and the arrow indicates that a non-zero value is mapped to the corresponding tone index.
  • 20 is a diagram illustrating a 2x HE-STF tone in 20MHz PPDU transmission.
  • the 2x HE-STF sequence is a tone index from -120 to 120 Among the tones having, it is mapped to a tone having a tone index that is a multiple of 8 excluding DC, and 0 can be mapped to the remaining tones. That is, a 2x HE-STF tone in a 20MHz channel may be located at a tone index that is a multiple of 8 excluding DC among tones having a tone index from -120 to 120. Therefore, a total of 30 2x HE-STF tones to which 2x HE-STF sequences are mapped may exist in a 20MHz channel.
  • Figure 2 (b) is a diagram illustrating a 2x HE-STF tone in 40MHz PPDU transmission.
  • the 2x HE-STF sequence is a tone index from -248 to 248 Among the tones having, it is mapped to a tone having a tone index that is a multiple of 8 excluding DC, and 0 can be mapped to the remaining tones. That is, a 2x HE-STF tone in a 40MHz channel may be located at a tone index that is a multiple of 8 excluding DC among tones having a tone index from -248 to 248.
  • the tones having a tone index of ⁇ 248 correspond to guard tones (left and right guard tones) and may be nulled (ie, may have a value of 0). Accordingly, a total of 60 2x HE-STF tones to which 2x HE-STF sequences are mapped may exist in a 40MHz channel.
  • Figure (c) is a diagram illustrating a 2x HE-STF tone in 80MHz PPDU transmission.
  • the 2x HE-STF sequence is a tone index from -504 to 504 Among the tones having, it is mapped to a tone having a tone index that is a multiple of 8 excluding DC, and 0 can be mapped to the remaining tones. That is, a 2x HE-STF tone in an 80MHz channel may be located at a tone index that is a multiple of 8 excluding DC among tones having a tone index from -504 to 504.
  • the tones having a tone index of ⁇ 504 correspond to guard tones (left and right guard tones), and may be nulled (ie, may have a value of 0). Accordingly, a total of 124 2x HE-STF tones to which a 2x HE-STF sequence is mapped may exist in an 80MHz channel.
  • the 1x HE-STF sequence of FIG. 19 can be used to configure HE-STF fields for HE PPDUs other than HE TB PPDUs.
  • the 2x HE-STF sequence of FIG. 20 can be used to configure the HE-STF field for the HE TB PPDU.
  • a sequence applicable to 1x HE-STF tones ie, sampling at 16 ton intervals
  • a sequence applicable to 2x HE-STF tones ie, sampling to 8 ton intervals
  • a basic sequence is set, and a nested structure including the basic sequence is used as part of a new sequence, and a highly scalable sequence structure is proposed.
  • the M sequence used in the following example is preferably a sequence having a length of 15.
  • the M sequence is composed of a binary sequence, and it is desirable to reduce complexity in decoding.
  • the M sequence used to configure the HE-STF field is defined as follows.
  • M ⁇ -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1 ⁇
  • the HE-STF field may be configured by mapping each 242-tone RU to an M sequence multiplied by (1+j)/sqrt(2) or (-1-j)/sqrt(2). For transmission bandwidths greater than 40 MHz, (1+j)/sqrt(2) or (-1-j)/sqrt(2) is placed in the subcarrier index inside the center 26-tone RU (center 26-tone RU). Can be assigned.
  • the frequency domain sequence for HE PPDU rather than HE TB PPDU is given below.
  • the frequency domain sequence for HE TB PPDU and HE TB feedback NDP (Null Data Packet) is given as follows.
  • next-generation 802.11 a method of increasing the data stream (up to 16 spatial streams) that can be transmitted using more antennas or using up to 320MHz of bandwidth compared to the existing 11ax is considered for increasing peak throughput.
  • the configuration of the 2x EHT-STF sequence may vary depending on the tone plan.
  • the existing 11ax 80MHz tone plan (refer to FIG. 7) considers a broadband structure in which it is repeated.
  • the existing 80MHz 2x HE-STF sequence can be repeated to construct a 2x EHT-STF sequence for broadband.
  • PAPR Peak To Amplitude Power Ratio
  • PAPR may be increased due to the nature of the repetition of the sequence, so it is necessary to additionally apply phase rotation.
  • the 80MHz 1x HE-STF sequence was repeated twice to form a 160MHz 1x HE-STF sequence, and then the sequence was constructed by multiplying the first 40MHz part of the secondary 80MHz channel (or 80MHz channel with a relatively high frequency) by -1.
  • this method is extended, that is, 80 MHz STF sequence is repeated twice and additional phase rotation is applied in 20/40/80 MHz increments to other channels except for the primary channel (or 80 MHz channel having a relatively low frequency).
  • a sequence that lowers PAPR by applying additional phase rotation in 20/40/80/160 MHz units to a secondary 160 MHz channel (or 80 MHz channel with a relatively high frequency) by repeating a 160 MHz STF sequence is proposed.
  • 2x STF sequence is an STF sequence used for HE TB PPDU, and when UL MU is transmitted, the AP receives information from non-AP STAs.
  • each user may be transmitted by OFDMA and may be transmitted by being assigned at least one RU per user. For this reason, it is necessary to measure PAPR in RU units when considering PAPR.
  • the 160, 240, and 320 MHz tone plans considered in this specification are repeated 2, 3, and 4 times of the 11ax 80 MHz tone plan.
  • the 160 MHz tone plan there are 74 26RUs, 32 52RUs, 16 106RUs, and 242RUs. Eight, four 484RUs, two 996RUs, and one 2x996RU may be present.
  • the method of selecting the optimal sequence is as follows.
  • the 160 MHz 2x-STF sequence will be described as an example.
  • the sequence for the 160 MHz band with phase rotation in 40 MHz increments is referred to as 1 2x-STF sequence.
  • the sequence for the 160 MHz band where the phase rotation is performed in 40 MHz units is called a 2x-STF sequence.
  • PAPR is measured for every RU for the 1 2x-STF sequence. In the case of 160 MHz, there are 74+32+16+8+4+2+1 RUs, so there are 74+32+16+8+4+2+1 PAPR values. Since the transmission of all RUs should be considered, the max value of PAPR of 137 RUs should be considered.
  • the max PAPR of 1st 2x-STF sequence is called a.
  • the max PAPR of No. 2 2x-STF sequence obtained by the above method is called b.
  • a sequence having a smaller value among a and b is selected.
  • each sequence has a max PAPR value, and among them, a sequence having the smallest max PAPR value is determined as the optimal sequence.
  • the optimized sequence is proposed using the same M sequence as in 11ax, and the M sequence is as follows.
  • M ⁇ -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1 ⁇
  • the existing 80MHz 2x HE-STF can be used as it is and is as follows.
  • EHT-STF -504:8:504 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1016:8:1016 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M - 1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1016:8:1016 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M] 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • 80MHz 2x HE- STF Sequence repetition and additional phase rotation in 40MHz increments are applied to 80MHz channels with relatively high frequencies.
  • EHT-STF -1016:8:1016 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M 1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1016:8:1016 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • 240MHz it can be configured as 160MHz + 80MHz (2x996RU + 996RU) or 80MHz + 160MHz (996RU + 2x996 RU).
  • the optimization sequence is obtained by dividing it into considerations when considering such a configuration and when not considering it.
  • EHT-STF 1528 0
  • EHT-STF 520 0
  • EHT-STF -8 0
  • EHT-STF 8 0
  • EHT-STF -1528:8:1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M - 1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M - 1 M -1 -M- 1 M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8: 1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M]-1*[1 -M 1 -M] 0 M -1 M -1*[-1 -M -1 M] -1*[0 -M 1 M] 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8: 1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M] -1*[1 -M 1 -M] -1*[0 M -1 M] -1 -M -1 M 0 -M 1 M -1*[1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8: 1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M] -1*[-1- M -1 M] 0 -M 1 M 1 -M 1 -M 0 M -1 M -1*[-1 -M -1 M] -1*[ 0 -M 1 M] 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8: 1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M] -1*[ -1- M -1 M] 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M ⁇ -1 -M -1 M 0 -M 1 M -1*[1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8:1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M 1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8:1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M -1 -M -1 M] 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 - M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8:1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 - M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8:1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M 1 M 0 -M 1 M 1 -M 1 - M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8:1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M - 1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M - 1 M -1 -M- 1 M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8:1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M] 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M -1*[1 -M 1 -M] ⁇ * (1+j) / sqrt(2 )
  • EHT-STF -1528:8:1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M 1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8:1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M -1 -M -1 M] 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8:1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -1528:8: 1528 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] -1 * [0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] ⁇ * (1+j) / sqrt(2 )
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] -1 * [1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M]- 1 * [-1 -M -1 M] 0 -M 1 M] 0 -M 1 M] 0 -M 1 M] 0 -M 1 M] 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] -1 * [1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M -1 * [1 -M 1 -M] 0 M -1 M- 1 * [-1 -M 1 M] 0 -M 1 M] 0 -M 1 M] 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] -1 * [1 -M 1 -M] 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] 1 -M 1 -M -1 * [0 M -1 M] -1 -M 1 -1 M 0 -M 1 M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] -1 * [1 -M 1 -M] 0 M -1 M -1 * [-1 -M -1 M] 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1 -M 1 M] -1 * [0 -M 1 M] 1 * [0 -M 1 M] 1 * [0 -M 1 M] 1 * [0 -M 1 M] 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] -1 * [1 -M 1 -M] 0 M -1 M -1 * [-1 -M -1 M] -1 * [0 -M 1 M] -1 * [1 -M 1 -M] 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] -1 * [1 -M 1 -M] -1 * [0 M -1 M] -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M- 1 -M -1 M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M 1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1 -M -1 M ] 0 -M 1 M -1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] -1 * [1 -M 1 -M] -1 * [0 M -1 M] -1 * [0 -M 1 M] -1 * [1 -M 1 -M] -1 * [1 -M 1 -M] 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] -1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1- M -1 M] 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 M -1 -M -1 M -1 * [0 -M 1 M] -1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1- M -1 M] 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M -1 * [1 -M 1 -M] -1 * [0 M -1 M] -1 -M -1 M -1 * [0 -M 1 M] -1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1- M -1 M] 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 * [0 -M 1 M] 1 -M 1 -M 0 M -1 M- 1 * [-1 -M 1 M] -1 * [0 -M 1 M] -1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1- M -1 M] 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 * [-1 -M -1 M] 0 -M 1 M 1 -M 1 -M 0 M -1 M- 1 -M -1 M- 1 -M -1 M 0 -M 1 M -1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1- M -1 M] 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M- 1 -M -1 M- 1 -M -1 M -1 * [0 -M 1 M] 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1- M -1 M] 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1 -M -1 M] 0 -M 1 M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1- M -1 M] 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1 -M -1 M] 0 -M 1 M -1 * [1 -M 1 -M] -1 * [0 M -1 M] -1 -M -1 M 0 -M 1 M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1- M -1 M] 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1 -M -1 M] -1 * [0 -M 1 M] 1- M 1 -M 0 M -1 M -1 * [-1 -M -1 M] 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1- M -1 M] 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1 -M 1 M] -1 * [0 -M 1 M] -1 * [1 -M 1 -M] -1 * [0 M -1 M] -1 * [-1 -M 1 M] 0 -M 1 M] 0 -M 1 M] 0 -M 1 M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M 1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 * [0 M -1 M -1 -M 1 M ] 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M 1 -M 1 -M] -1 * [0 M -1 M -1 -M -1 M] -1 * [0 -M 1 M 1 -M 1 -M] 0 M -1 M- 1 -M -1 M -1 * [0 -M 1 M 1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M] 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [ 0 -M 1 M 1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M] 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M] -1 * [0 -M 1 M 1 -M 1 -M] -1 * [0 M -1 M -1 -M 1 -M] -1 * [0 M -1 M -1 -M 1 -1 M] 0 -M 1 M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M 1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M 1 M -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] -1 * [0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] -1 * [0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1 * [0 -M 1 -M] -1 * [1 M 1 -M]- 1 * [0 -M 1 M] -1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M 0 -M 1 M -1 * [1 -M 1 -M] 0 -M 1 -M -1 * [1 M 1 -M]- 1 * [0 -M 1 M] -1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1 * [0 -M 1 M] 1 -M 1 -M -1 * [0 -M 1 -M] 1 M 1 -M- 1 * [0 -M 1 M] -1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 * [-1 -M -1 M] 0 -M 1 M 1 -M 1 -M -1 * [0 -M 1 -M] -1 * [1 M 1 -M] 0 -M 1 M -1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M- 1 * [1 -M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M 1 M 0 -M 1 M 1 -M 1 -M -1 * [0 -M 1 -M] -1 * [1 M 1 -M]- 1 * [0 -M 1 M] 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1 -M -1 M] 0 -M 1 M -1 * [1 -M 1 -M] 0 -M 1 -M- 1 * [1 M 1 -M] 0 -M 1 M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1 -M -1 M] -1 * [0 -M 1 M] 1 -M 1 -M -1 * [0 -M 1 -M] 1 M 1 -M 0 -M 1 M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M] -1 * [-1 -M -1 M] -1 * [0 -M 1 M] -1 * [1 -M 1 -M] 0- M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • 160MHz 2x HE- STF Sequence repetition and additional phase rotation in units of 40MHz are applied in a 160MHz channel with a relatively high frequency.
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M 1 M 0 -M 1 M 1 -M 1 -M -1 * [0 -M 1 -M 1 M 1 -M] -1 * [0- M 1 M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M] -1 * [0 -M 1 M 1 -M 1 -M] 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M 1 M 0 -M 1 M 1 -M 1 -M -1 * [0 -M 1 -M 1 M 1 -M 0 -M 1 M 1- M 1 -M] ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M] 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M ⁇ * (1+j) / sqrt(2)
  • EHT-STF -2040:8:2040 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1 -M 1 -M -1 * [0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 -M 1 -M 1 M 1 -M 0 -M 1 M 1- M 1 -M] ⁇ * (1+j) / sqrt(2)
  • a method of using a good sequence of PAPR proposed at 320 MHz described above in a discontinuous 160 + 160 MHz band (or channel) is applied.
  • a sequence applied to 160MHz with a relatively low frequency can be applied to a sequence of good PAPR suggested at a continuous 320MHz to a primary 160MHz, and a sequence applied to a 160MHz with a relatively high frequency to a secondary 160MHz. Can be applied.
  • EHT-STF -1008:16:1008 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M] -1*[1 -M 1 -M] ⁇ *(1+j)/sqrt(2)
  • EHT-STF -1008:16:1008 ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M] -1*[-1- M -1 M] 0 -M 1 M 1 -M 1 -M ⁇ *(1+j)/sqrt(2)
  • 21 is a flowchart illustrating a procedure for transmitting an EHT PPDU in a transmitting STA according to this embodiment.
  • the example of FIG. 21 may be performed in a network environment in which a next generation wireless LAN system is supported.
  • the next-generation wireless LAN system is an improved wireless LAN system that can satisfy backward compatibility with the 802.11ax system.
  • the next-generation wireless LAN system may support broadband to increase throughput.
  • the broadband includes 160MHz, 240MHz, and 320MHz bands (or 160+160MHz bands).
  • the STF sequence for obtaining the optimal PAPR in consideration of the tone plan for each band (configuration of all RUs in the wideband) Suggest.
  • the example of FIG. 21 is performed by a transmitting STA, and the transmitting STA may correspond to an access point (AP).
  • the receiving STA of FIG. 21 may correspond to an STA supporting an Extreme High Throughput (EHT) wireless LAN system.
  • EHT Extreme High Throughput
  • step S2110 the transmitting STA (station) generates a short training field (STF) signal for the 320 MHz band or the 160+160 MHz band.
  • STF short training field
  • step S2120 the transmitting STA transmits the EHT PPDU including the STF signal to a receiving STA.
  • the STF signal is generated based on the EHT STF sequence for the 320 MHz band or the 160 + 160 MHz band.
  • the EHT STF sequence for the 320 MHz band is defined as the first sequence in which a predetermined M sequence is repeated.
  • the predetermined M sequence is defined as follows.
  • M ⁇ -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1 ⁇
  • the predetermined M sequence is the same as the M sequence defined in 802.11ax.
  • the EHT STF sequence for the 160+160 MHz band may be composed of a second sequence for a primary 160 MHz channel and a third sequence for a secondary 160 MHz channel.
  • the second sequence may be defined as follows.
  • the third sequence may be defined as follows.
  • the first sequence (ie, ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 M -1*[0 -M 1 M] -1*[1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M] -1*[ -1 -M -1 M] 0 -M 1 M 1 -M 1 -M ⁇ *(1+j)/sqrt(2)) ranges from the lowest tone with -2040 to the highest tone with tone index +2040. It may be mapped to frequency tones at tone intervals. In the first sequence, the tones having the tone indices -2040, -1032, -1016, -8, 8, 1016, 1032, and 2040 may be set to 0.
  • the second and third sequences may be mapped to frequency tones in 8 ton intervals, from the lowest tone having a tone index -1016 to the highest tone having a tone index +1016.
  • the tones having the tone indices -1016, -8, 8, and 1016 may be set to 0.
  • IFFT Inverse Fast
  • a time domain signal of 12.8us is repeated with the same 8 signals of 1.6us period.
  • the signal of 1.6us can be repeated only 5 times to make a 2x STF signal of 8us.
  • the STF signal may be the 2x STF signal.
  • the 2x STF signal may be used for a High Efficiency (HE) Trigger Based (TB) PPDU. That is, the EHT PPDU may be a TB PPDU defined in the EHT wireless LAN system.
  • HE High Efficiency
  • TB Trigger Based
  • the 320 MHz band may include first to fourth 80 MHz channels.
  • the first 80 MHz channel is the 80 MHz channel with the lowest tone index
  • the second 80 MHz channel is the 80 MHz channel with the second lowest tone index
  • the third 80 MHz channel is the 80 MHz channel with the third lowest tone index
  • the fourth 80MHz channel may be the 80MHz channel with the highest tone index.
  • the first sequence may be generated by applying phase rotation in units of 20 MHz to the sequences for the second and fourth 80 MHz channels in the fourth sequence in which the HE (High Efficiency) STF sequence for the 80 MHz band is repeated.
  • the fourth sequence may be defined as follows.
  • the fourth sequence may be generated by repeating the HE STF sequence for the 80 MHz band 4 times.
  • the HE STF sequence for the 80 MHz band uses the 80 MHz 2x HE STF sequence defined in the 802.11ax wireless LAN system. That is, the HE STF sequence for the 80 MHz band may be defined as follows.
  • the repetitive sequence such as the second sequence, has a disadvantage that PAPR increases, and thus it is necessary to additionally apply phase rotation.
  • phase rotation a method of applying phase rotation will be described.
  • the second 80 MHz channel may include first to fourth 20 MHz channels.
  • the first 20 MHz channel is the 20 MHz channel with the lowest tone index
  • the second 20 MHz channel is the 20 MHz channel with the second lowest tone index
  • the third 20 MHz channel is the 20 MHz channel with the third lowest tone index
  • the fourth 20 MHz channel may be a 20 MHz channel having the highest tone index.
  • the phase rotation may be applied to sequences for the third and fourth 20 MHz channels among the second 80 MHz channels.
  • the value of the phase rotation is -1.
  • the fourth 80 MHz channel may include fifth to eighth 20 MHz channels.
  • the fifth 20 MHz channel is the 20 MHz channel with the lowest tone index
  • the sixth 20 MHz channel is the 20 MHz channel with the second lowest tone index
  • the seventh 20 MHz channel is the 20 MHz channel with the third lowest tone index
  • the eighth 20MHz channel may be the 20MHz channel with the highest tone index.
  • the phase rotation may be applied to sequences for the fifth and sixth 20 MHz channels among the fourth 80 MHz channels.
  • the value of the phase rotation is -1.
  • the first sequence (ie, ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M] -1*[1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1- M -1*[0 M -1 M] -1*[-1 -M -1 M] 0 -M 1 M 1 -M 1 -M ⁇ *(1+j)/sqrt(2)) to be acquired Can.
  • the first tone plan of the 320 MHz band or 160+160 MHz band may be determined by repetition of the second tone plan for the 80 MHz band defined in the 802.11ax WLAN system.
  • the EHT PPDU may be transmitted through the 320 MHz band or 160+160 MHz band based on the first tone plan.
  • the 320 MHz band or 160+160 MHz band is based on the first tone plan, 26 ton RU (Resource Unit), 52 ton RU, 106 ton RU, 242 ton RU, 484 ton RU, 996 ton RU, 2*996 ton RU , 3*996 ton RU or 4*996 ton RU.
  • the 320MHz band has 148 26-ton RU, 64 52-ton RU, 32 106-ton RU, 16 242-ton RU, 8 484-ton RU, 4 996-ton RU, 2 2*996-ton RU, one 3*996 ton RU or a combination of one 4*996 ton RU.
  • the STF signal can be used to improve automatic gain control (AGC) estimation in multiple input multiple output (MIMO) transmission.
  • AGC automatic gain control
  • the EHT STF sequence may be a sequence for obtaining a minimum peak-to-average power radio (PAPR) based on the first tone plan. That is, this embodiment proposes an optimized STF sequence from the PAPR point of view considering all RU configurations of the 320 MHz band or the 160+160 MHz band, which repeats the tone plan for the 80 MHz band defined in the 802.11ax WLAN system. However, this embodiment describes only the 320MHz band or the 160+160MHz band, but for the 160MHz band and the 240MHz band, an optimized STF sequence can be set from the PAPR point of view, and the related embodiments have been described above.
  • PAPR peak-to-average power radio
  • FIG. 22 is a flowchart illustrating a procedure for receiving an EHT PPDU at a receiving STA according to the present embodiment.
  • the example of FIG. 22 may be performed in a network environment in which a next generation wireless LAN system is supported.
  • the next-generation wireless LAN system is an improved wireless LAN system that can satisfy backward compatibility with the 802.11ax system.
  • the next-generation wireless LAN system may support broadband to increase throughput.
  • the broadband includes 160MHz, 240MHz, and 320MHz bands (or 160+160MHz bands).
  • the STF sequence for obtaining the optimal PAPR in consideration of the tone plan for each band (configuration of all RUs in the wideband) Suggest.
  • FIG. 22 may be performed by a receiving STA and correspond to an STA supporting an Extreme High Throughput (EHT) wireless LAN system.
  • the transmitting STA of FIG. 22 may correspond to the AP.
  • a receiving STA receives the EHT PPDU including a short training field (STF) signal for a 320 MHz band or a 160+160 MHz band from a transmitting STA.
  • STF short training field
  • step S2220 the receiving STA decodes the EHT PPDU.
  • the receiving STA may perform automatic gain control (AGC) estimation in multiple input multiple output (MIMO) transmission based on the STF signal.
  • AGC automatic gain control
  • the STF signal is generated based on the EHT STF sequence for the 320 MHz band or 160+160 MHz band.
  • the EHT STF sequence for the 320 MHz band is defined as the first sequence in which a predetermined M sequence is repeated.
  • the predetermined M sequence is defined as follows.
  • M ⁇ -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1 ⁇
  • the predetermined M sequence is the same as the M sequence defined in 802.11ax.
  • the EHT STF sequence for the 160+160 MHz band may be composed of a second sequence for a primary 160 MHz channel and a third sequence for a secondary 160 MHz channel.
  • the second sequence may be defined as follows.
  • the third sequence may be defined as follows.
  • the first sequence (ie, ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 M -1*[0 -M 1 M] -1*[1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M] -1*[ -1 -M -1 M] 0 -M 1 M 1 -M 1 -M ⁇ *(1+j)/sqrt(2)) ranges from the lowest tone with -2040 to the highest tone with tone index +2040. It may be mapped to frequency tones at tone intervals. In the first sequence, the tones having the tone indices -2040, -1032, -1016, -8, 8, 1016, 1032, and 2040 may be set to 0.
  • the second and third sequences may be mapped to frequency tones in 8 ton intervals, from the lowest tone having a tone index -1016 to the highest tone having a tone index +1016.
  • the tones having the tone indices -1016, -8, 8, and 1016 may be set to 0.
  • IFFT Inverse Fast
  • a time domain signal of 12.8us is repeated with the same 8 signals of 1.6us period.
  • the signal of 1.6us can be repeated only 5 times to make a 2x STF signal of 8us.
  • the STF signal may be the 2x STF signal.
  • the 2x STF signal may be used for a High Efficiency (HE) Trigger Based (TB) PPDU. That is, the EHT PPDU may be a TB PPDU defined in the EHT wireless LAN system.
  • HE High Efficiency
  • TB Trigger Based
  • the 320 MHz band may include first to fourth 80 MHz channels.
  • the first 80 MHz channel is the 80 MHz channel with the lowest tone index
  • the second 80 MHz channel is the 80 MHz channel with the second lowest tone index
  • the third 80 MHz channel is the 80 MHz channel with the third lowest tone index
  • the fourth 80MHz channel may be the 80MHz channel with the highest tone index.
  • the first sequence may be generated by applying phase rotation in units of 20 MHz to the sequences for the second and fourth 80 MHz channels in the fourth sequence in which the HE (High Efficiency) STF sequence for the 80 MHz band is repeated.
  • the fourth sequence may be defined as follows.
  • the fourth sequence may be generated by repeating the HE STF sequence for the 80 MHz band 4 times.
  • the HE STF sequence for the 80 MHz band uses the 80 MHz 2x HE STF sequence defined in the 802.11ax wireless LAN system. That is, the HE STF sequence for the 80 MHz band may be defined as follows.
  • the repetitive sequence such as the second sequence, has a disadvantage that PAPR increases, and thus it is necessary to additionally apply phase rotation.
  • phase rotation a method of applying phase rotation will be described.
  • the second 80 MHz channel may include first to fourth 20 MHz channels.
  • the first 20 MHz channel is the 20 MHz channel with the lowest tone index
  • the second 20 MHz channel is the 20 MHz channel with the second lowest tone index
  • the third 20 MHz channel is the 20 MHz channel with the third lowest tone index
  • the fourth 20 MHz channel may be a 20 MHz channel having the highest tone index.
  • the phase rotation may be applied to sequences for the third and fourth 20 MHz channels among the second 80 MHz channels.
  • the value of the phase rotation is -1.
  • the fourth 80 MHz channel may include fifth to eighth 20 MHz channels.
  • the fifth 20 MHz channel is the 20 MHz channel with the lowest tone index
  • the sixth 20 MHz channel is the 20 MHz channel with the second lowest tone index
  • the seventh 20 MHz channel is the 20 MHz channel with the third lowest tone index
  • the eighth 20MHz channel may be the 20MHz channel with the highest tone index.
  • the phase rotation may be applied to sequences for the fifth and sixth 20 MHz channels among the fourth 80 MHz channels.
  • the value of the phase rotation is -1.
  • the first sequence (ie, ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M] -1*[1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1- M -1*[0 M -1 M] -1*[-1 -M -1 M] 0 -M 1 M 1 -M 1 -M ⁇ *(1+j)/sqrt(2)) to be acquired Can.
  • the first tone plan of the 320 MHz band or 160+160 MHz band may be determined by repetition of the second tone plan for the 80 MHz band defined in the 802.11ax WLAN system.
  • the EHT PPDU may be transmitted through the 320 MHz band or 160+160 MHz band based on the first tone plan.
  • the 320 MHz band or 160+160 MHz band is based on the first tone plan, 26 ton RU (Resource Unit), 52 ton RU, 106 ton RU, 242 ton RU, 484 ton RU, 996 ton RU, 2*996 ton RU , 3*996 ton RU or 4*996 ton RU.
  • the 320MHz band has 148 26-ton RU, 64 52-ton RU, 32 106-ton RU, 16 242-ton RU, 8 484-ton RU, 4 996-ton RU, 2 2*996-ton RU, one 3*996 ton RU or a combination of one 4*996 ton RU.
  • the STF signal can be used to improve automatic gain control (AGC) estimation in multiple input multiple output (MIMO) transmission.
  • AGC automatic gain control
  • the EHT STF sequence may be a sequence for obtaining a minimum peak-to-average power radio (PAPR) based on the first tone plan. That is, this embodiment proposes an optimized STF sequence from the PAPR point of view considering all RU configurations of the 320 MHz band or the 160+160 MHz band, which repeats the tone plan for the 80 MHz band defined in the 802.11ax WLAN system. However, this embodiment describes only the 320MHz band or the 160+160MHz band, but for the 160MHz band and the 240MHz band, an optimized STF sequence can be set from the PAPR point of view, and the related embodiments have been described above.
  • PAPR peak-to-average power radio
  • FIG. 23 shows a more detailed wireless device implementing an embodiment of the present invention.
  • the present invention described above for the transmitting device or the receiving device can be applied to this embodiment.
  • the wireless device includes a processor 610, a power management module 611, a battery 612, a display 613, a keypad 614, a subscriber identification module (SIM) card 615, a memory 620, and a transceiver 630 ), one or more antennas 631, a speaker 640, and a microphone 641.
  • a processor 610 a power management module 611, a battery 612, a display 613, a keypad 614, a subscriber identification module (SIM) card 615, a memory 620, and a transceiver 630 ), one or more antennas 631, a speaker 640, and a microphone 641.
  • SIM subscriber identification module
  • the processor 610 can be configured to implement the proposed functions, procedures and/or methods described herein. Layers of the radio interface protocol may be implemented in the processor 610.
  • the processor 610 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 processor 610 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator).
  • DSP digital signal processor
  • CPU central processing unit
  • GPU graphics processing unit
  • modem modulator and demodulator
  • processors 610 include SNAPDRAGONTM series processors manufactured by Qualcomm®, EXYNOSTM series processors manufactured by Samsung®, A series processors manufactured by Apple®, HELIOTM series processors manufactured by MediaTek®, and INTEL®. It may be an ATOMTM series processor manufactured by or a corresponding next-generation processor.
  • 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 results processed by the processor 610.
  • Keypad 614 receives input to be used by processor 610.
  • the keypad 614 may be displayed on the display 613.
  • the SIM card 615 is 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. Many SIM cards can also store contact information.
  • IMSI international mobile subscriber identity
  • the memory 620 is operatively coupled with the processor 610, and stores various information for operating the processor 610.
  • the memory 620 may include read-only memory (ROM), random access memory (RAM), flash memory, a memory card, a storage medium, and/or other storage devices.
  • ROM read-only memory
  • RAM random access memory
  • flash memory a memory card
  • storage medium e.g., hard disk drives
  • modules may be stored in memory 620 and executed by processor 610.
  • the memory 620 may be implemented inside the processor 610. Alternatively, the memory 620 may be implemented outside the processor 610 and may be communicatively connected to the processor 610 through various means known in the art.
  • the transceiver 630 is operatively coupled with the processor 610, and transmits and/or receives wireless signals.
  • the transceiver 630 includes a transmitter and a receiver.
  • the transceiver 630 may include a base band circuit for processing radio frequency signals.
  • the transmitting and receiving unit controls one or more antennas 631 to transmit and/or receive wireless signals.
  • the speaker 640 outputs sound-related results processed by the processor 610.
  • the microphone 641 receives sound-related inputs to be used by the processor 610.
  • the processor 610 In the case of a transmitting device, the processor 610 generates an STF signal for a 320 MHz band or a 160+160 MHz band, and transmits the EHT PPDU including the STF signal to a receiving STA.
  • the processor 610 receives the EHT PPDU including a Short Training Field (STF) signal for a 320 MHz band or a 160+160 MHz band from a transmitting STA, decodes the EHT PPDU, and the STF signal AGC estimation is performed in MIMO transmission based on.
  • STF Short Training Field
  • the 320 MHz band is a continuous band, and the 160+160 MHz band is a discontinuous band.
  • the STF signal is generated based on the EHT STF sequence for the 320 MHz band or 160+160 MHz band.
  • the EHT STF sequence for the 320 MHz band is defined as the first sequence in which a predetermined M sequence is repeated.
  • the predetermined M sequence is defined as follows.
  • M ⁇ -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1 ⁇
  • the predetermined M sequence is the same as the M sequence defined in 802.11ax.
  • the EHT STF sequence for the 160+160 MHz band may be composed of a second sequence for a primary 160 MHz channel and a third sequence for a secondary 160 MHz channel.
  • the second sequence may be defined as follows.
  • the third sequence may be defined as follows.
  • the first sequence (ie, ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 M -1*[0 -M 1 M] -1*[1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M] -1*[ -1 -M 1 M] 0 -M 1 M 1 -M 1 -M ⁇ *(1+j)/sqrt(2)) ranges from the lowest tone with -2040 to the highest tone with tone index +2040. It can be mapped to frequency tones at tone intervals. In the first sequence, the tones having the tone indices -2040, -1032, -1016, -8, 8, 1016, 1032, and 2040 may be set to 0.
  • the second and third sequences may be mapped to frequency tones in 8 ton intervals, from the lowest tone having a tone index -1016 to the highest tone having a tone index +1016.
  • the tones having the tone indices -1016, -8, 8, and 1016 may be set to 0.
  • IFFT Inverse Fast
  • a time domain signal of 12.8us is repeated with the same 8 signals of 1.6us period.
  • the signal of 1.6us can be repeated only 5 times to make a 2x STF signal of 8us.
  • the STF signal may be the 2x STF signal.
  • the 2x STF signal may be used for a High Efficiency (HE) Trigger Based (TB) PPDU. That is, the EHT PPDU may be a TB PPDU defined in the EHT wireless LAN system.
  • HE High Efficiency
  • TB Trigger Based
  • the 320 MHz band may include first to fourth 80 MHz channels.
  • the first 80 MHz channel is the 80 MHz channel with the lowest tone index
  • the second 80 MHz channel is the 80 MHz channel with the second lowest tone index
  • the third 80 MHz channel is the 80 MHz channel with the third lowest tone index
  • the fourth 80MHz channel may be the 80MHz channel with the highest tone index.
  • the first sequence may be generated by applying phase rotation in units of 20 MHz to the sequences for the second and fourth 80 MHz channels in the fourth sequence in which the HE (High Efficiency) STF sequence for the 80 MHz band is repeated.
  • the fourth sequence may be defined as follows.
  • the fourth sequence may be generated by repeating the HE STF sequence for the 80 MHz band 4 times.
  • the HE STF sequence for the 80 MHz band uses the 80 MHz 2x HE STF sequence defined in the 802.11ax wireless LAN system. That is, the HE STF sequence for the 80 MHz band may be defined as follows.
  • the repetitive sequence such as the second sequence, has a disadvantage that PAPR increases, and thus it is necessary to additionally apply phase rotation.
  • phase rotation a method of applying phase rotation will be described.
  • the second 80 MHz channel may include first to fourth 20 MHz channels.
  • the first 20 MHz channel is the 20 MHz channel with the lowest tone index
  • the second 20 MHz channel is the 20 MHz channel with the second lowest tone index
  • the third 20 MHz channel is the 20 MHz channel with the third lowest tone index
  • the fourth 20 MHz channel may be a 20 MHz channel having the highest tone index.
  • the phase rotation may be applied to sequences for the third and fourth 20 MHz channels among the second 80 MHz channels.
  • the value of the phase rotation is -1.
  • the fourth 80 MHz channel may include fifth to eighth 20 MHz channels.
  • the fifth 20 MHz channel is the 20 MHz channel with the lowest tone index
  • the sixth 20 MHz channel is the 20 MHz channel with the second lowest tone index
  • the seventh 20 MHz channel is the 20 MHz channel with the third lowest tone index
  • the eighth 20MHz channel may be the 20MHz channel with the highest tone index.
  • the phase rotation may be applied to sequences for the fifth and sixth 20 MHz channels among the fourth 80 MHz channels.
  • the value of the phase rotation is -1.
  • the first sequence (ie, ⁇ M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M] -1*[1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1- M -1*[0 M -1 M] -1*[-1 -M -1 M] 0 -M 1 M 1 -M 1 -M ⁇ *(1+j)/sqrt(2)) to be acquired Can.
  • the first tone plan of the 320 MHz band or 160+160 MHz band may be determined by repetition of the second tone plan for the 80 MHz band defined in the 802.11ax WLAN system.
  • the EHT PPDU may be transmitted through the 320 MHz band or 160+160 MHz band based on the first tone plan.
  • the 320 MHz band or 160+160 MHz band is based on the first tone plan, 26 ton RU (Resource Unit), 52 ton RU, 106 ton RU, 242 ton RU, 484 ton RU, 996 ton RU, 2*996 ton RU , 3*996 ton RU or 4*996 ton RU.
  • the 320MHz band has 148 26-ton RU, 64 52-ton RU, 32 106-ton RU, 16 242-ton RU, 8 484-ton RU, 4 996-ton RU, 2 2*996-ton RU, one 3*996 ton RU or a combination of one 4*996 ton RU.
  • the STF signal can be used to improve automatic gain control (AGC) estimation in multiple input multiple output (MIMO) transmission.
  • AGC automatic gain control
  • the EHT STF sequence may be a sequence for obtaining a minimum peak-to-average power radio (PAPR) based on the first tone plan. That is, this embodiment proposes an optimized STF sequence from the PAPR point of view considering all RU configurations of the 320 MHz band or the 160+160 MHz band, which repeats the tone plan for the 80 MHz band defined in the 802.11ax WLAN system. However, this embodiment describes only the 320MHz band or the 160+160MHz band, but for the 160MHz band and the 240MHz band, an optimized STF sequence can be set from the PAPR point of view, and the related embodiments have been described above.
  • PAPR peak-to-average power radio
  • the technical features of the present specification described above can be applied to various applications or business models.
  • the above-described technical features may be applied for wireless communication in a device supporting artificial intelligence (AI).
  • AI artificial intelligence
  • Machine learning refers to the field of studying the methodology to define and solve various problems in the field of artificial intelligence. do.
  • Machine learning is defined as an algorithm that improves the performance of a job through constant experience.
  • An artificial neural network is a model used in machine learning, and may refer to an overall model having a problem-solving ability, composed of artificial neurons (nodes) forming a network through synaptic coupling.
  • An artificial neural network may be defined by a connection pattern between neurons in different layers, a learning process for updating model parameters, and an activation function that generates output values.
  • 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 can include neurons and synapses connecting neurons. In an artificial neural network, each neuron may output a function value of an input function input through a synapse, a weight, and an active function for bias.
  • the model parameter means a parameter determined through learning, and includes weights of synaptic connections and bias of neurons.
  • the hyperparameter means a parameter that must be set before learning in the machine learning algorithm, and includes learning rate, number of iterations, mini-batch size, initialization function, and the like.
  • the purpose of learning an artificial neural network can be seen as determining model parameters that minimize the loss function.
  • the loss function can be used as an index to determine an optimal model parameter in the learning process of an artificial neural network.
  • Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning according to the learning method.
  • Supervised learning refers to a method of training an artificial neural network while a label for training data is given, and a label is a correct answer (or a 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 without a label for learning data.
  • Reinforcement learning may mean a learning method in which an agent defined in a certain environment is trained to select an action or a sequence of actions to maximize cumulative reward in each state.
  • Machine learning which is implemented as a deep neural network (DNN) that includes a plurality of hidden layers among artificial neural networks, is also referred to as deep learning (deep learning), and deep learning is a part of machine learning.
  • DNN deep neural network
  • machine learning is used to mean deep learning.
  • a robot can mean a machine that automatically handles or acts on tasks given by its own capabilities.
  • a robot having a function of recognizing the environment and determining an operation by itself can 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 be provided with a driving unit including an actuator or a motor to perform various physical operations such as moving a robot joint.
  • the movable robot includes a wheel, a brake, a propeller, and the like in the driving unit, so that it can travel on the ground or fly in the air through the driving unit.
  • Augmented reality refers to virtual reality (VR), augmented reality (AR), and mixed reality (MR).
  • VR technology provides objects or backgrounds in the real world only as CG images
  • AR technology provides CG images made virtually on real objects
  • MR technology is a computer that mixes and combines virtual objects in the real world. It is a graphics technology.
  • MR technology is similar to AR technology in that it shows both real and virtual objects.
  • a virtual object is used as a complement to a real object, whereas in MR technology, there is a difference in that a virtual object and a real object are used with equal characteristics.
  • 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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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de transmission d'une PPDU EHT dans un système LAN sans fil. En particulier, une STA de transmission génère un signal STF pour une bande de 320MHz ou une bande de 160+160MHz. La STA de transmission transmet une PPDU EHT comprenant le signal STF à une STA de réception. Le signal STF est généré sur la base d'une séquence STF EHT pour une bande de 320MHz ou une bande de 160+160MHz. La séquence STF EHT pour une bande de 320 MHz est une première séquence dans laquelle des séquences M prédéfinies sont répétées, et est défini comme {M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M 0 M -1 M -1 -M -1 M -1*[0 -M 1 M] -1*[1 -M 1 -M] 0 M -1 M -1 -M -1 M 0 -M 1 M 1 -M 1 -M -1*[0 M -1 M] -1*[-1 -M -1 M] 0 -M 1 M 1 -M 1 -M}*(1+j)/sqrt(2).
PCT/KR2019/018104 2019-01-07 2019-12-19 Procédé et dispositif de transmission d'une ppdu eht dans un système lan sans fil WO2020145546A1 (fr)

Applications Claiming Priority (6)

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KR10-2019-0001961 2019-01-07
KR20190001961 2019-01-07
KR20190014023 2019-02-01
KR10-2019-0014023 2019-02-01
KR20190077165 2019-06-27
KR10-2019-0077165 2019-06-27

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016089003A1 (fr) * 2014-12-05 2016-06-09 엘지전자(주) Procédé pour transmettre/recevoir une unité de données de protocole physique (ppdu) dans un système de communication sans fil et appareil associé
WO2017065543A1 (fr) * 2015-10-14 2017-04-20 엘지전자 주식회사 Procédé de transmission d'informations indiquant un type de trame au sein d'un système de réseau local sans fil et dispositif associé
WO2017069589A1 (fr) * 2015-10-23 2017-04-27 엘지전자(주) Procédé de transmission de données dans un système de communication sans fil et dispositif correspondant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016089003A1 (fr) * 2014-12-05 2016-06-09 엘지전자(주) Procédé pour transmettre/recevoir une unité de données de protocole physique (ppdu) dans un système de communication sans fil et appareil associé
WO2017065543A1 (fr) * 2015-10-14 2017-04-20 엘지전자 주식회사 Procédé de transmission d'informations indiquant un type de trame au sein d'un système de réseau local sans fil et dispositif associé
WO2017069589A1 (fr) * 2015-10-23 2017-04-27 엘지전자(주) Procédé de transmission de données dans un système de communication sans fil et dispositif correspondant

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHOI, JINSOO ET AL.: "View on EHT objectives and technologies", IEEE 802.11-18/1 171R0, 9 July 2018 (2018-07-09), XP068128253 *
PARK, EUNSUNG ET AL.: "Overview of PHY features for EHT", IEEE 802. 11-18/1967 R0, 12 November 2018 (2018-11-12), XP068133454 *

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