WO2020080786A1 - Signaling method related to spatial stream for wireless communication - Google Patents

Abstract

An embodiment according to the present specification may relate to a station (STA) receiving an MU-MIMO packet on the basis of a maximum of four spatial streams in a wireless LAN system. For example, information used to allocate a maximum of four spatial streams to a maximum of 16 stations may be organized through six-bit information. For example, a signal containing a user-specific control field for STA multi-user (MU) communication according to the present specification may be received. In this case, the user-specific control field may comprise a first information field for the number of spatial streams for the user station (user STA), and a second information field including information about the size of the first information field. The user station according to the present specification may include a step of decoding a data field on the basis of the user-specific control field.

Description

Signaling technique related to spatial stream for wireless communication

This specification proposes a signaling technique related to a spatial stream used in wireless communication.

The wireless local area network (WLAN) has been improved in various ways. For example, the IEEE 802.11ax standard proposed an improved communication environment using orthogonal frequency division multiple access (OFDMA) and downlink multi-user multiple input (MIMO) techniques.

This specification improves the existing IEEE 802.11ax standard or proposes technical features that can be used in new communication standards. For example, the new communication standard may be an extreme high throughput (EHT) standard currently being discussed. The EHT standard can use newly proposed increased bandwidth, improved PHY protocol data unit (PPDU) structure, improved sequence, and hybrid automatic repeat request (HARQ) technique.

In the new WLAN standard, an increased number of spatial streams can be used. In this case, in order to properly use the increased number of spatial streams, the signaling technique in the WLAN system may need to be improved.

As a new wireless LAN standard is discussed, a technique for signaling an increased number of spatial streams should be proposed. For example, in the case of the IEEE 802.11ax standard, up to 16 spatial streams can be used. In addition, when MU-MIMO technique is applied to multiple User STAs, up to 8 or more spatial streams may be applied to one User STA.

If the number of spatial streams increases in the new WLAN standard, a problem arises in that the existing signaling technique needs to be changed.

In addition, when the number of spatial streams increases in a new WLAN standard, a technique for efficiently providing information on the number of spatial streams between a legacy station and a new standard station should be proposed.

For example, up to 16 streams are supported by the AP (Access Point) of the wireless LAN system, and the STA of the first type supports up to 4 spatial streams through the MU-MIMO technique and the maximum through the non-MU MIMO technique. Eight spatial streams can be supported. In this case, an improved signaling technique compared to the prior art can be used.

An example according to the present specification relates to a method and / or apparatus for receiving a signal in a wireless local area network (WLAN) system.

An example of the present specification includes receiving, by a user station (user STA), a signal including a user-specific control field for multi-user (MU) communication. In this case, the user-specific control field includes a first information field regarding the number of spatial streams for the user station and a size of the first information field. It may include a second information field including information about. For example, the second information field may include information about whether the first information field is 6-bit information.

An example of the present specification includes decoding, by the user station, a data field based on the user-specific control field.

An example according to the present specification proposes a technique in which a user STA and / or an AP can use an increased spatial stream even when the number of spatial streams is increased.

For example, an example of the present specification proposes an improved technique for signaling information about the capability of a spatial stream supported by a User STA and / or AP. Through this, efficient communication considering the capabilities of the user STA and / or the AP is possible.

In addition, an example of the present specification proposes an improved signaling technique when the number of spatial streams increases in a new WLAN standard. Through this, the user STA can accurately acquire the number of spatial streams allocated to the user STA.

In addition, an example of the present specification efficiently provides information on a spatial stream allocated to a user STA by using a control field in a situation where a STA supporting a new WLAN standard and a legacy STA are mixed. Through this, the WLAN system can support increased throughput, and each STA can perform data communication according to a more efficient technique.

1 shows an example of a transmitting device and / or a receiving device of the present specification.

2 is a conceptual diagram showing the structure of a wireless LAN (WLAN).

3 is a diagram for explaining a general link setup process.

4 is a diagram showing an example of a PPDU used in the IEEE standard.

5 is a view showing the arrangement of a resource unit (RU) used on a 20MHz band.

6 is a view showing the arrangement of a resource unit (RU) used on the 40MHz band.

7 is a view showing the arrangement of a resource unit (RU) used on the 80MHz band.

8 shows the structure of the HE-SIG-B field.

9 shows an example in which a plurality of User STAs are allocated to the same RU through the MU-MIMO technique.

10 shows the operation according to UL-MU.

11 shows an example of a trigger frame.

12 shows an example of a common information field of a trigger frame.

13 shows an example of a sub-field included in a per user information field.

14 describes the technical features of the UORA technique.

15 shows an example of channels used / supported / defined within the 2.4 GHz band.

16 shows an example of a channel used / supported / defined within a 5 GHz band.

17 shows an example of a channel used / supported / defined within a 6 GHz band.

18 shows an example of a PPDU used in the present specification.

19 is a first procedure flow chart according to an example of the present specification.

20 is a flowchart of a second procedure according to an example of the present specification.

The slash (/) or comma (comma) used in this specification may mean “and / or” (and / or). For example, “A / B” means “A and / or B”, and thus may mean “only A” or “only B” or “one of A and B”. In addition, technical features that are individually described in one drawing may be individually or simultaneously implemented.

Also, parentheses used in the present specification may mean “for example”. Specifically, when indicated as “control information (EHT-Signal)”, “EHT-Signal” may be proposed as an example of “control information”. In addition, even when displayed as “control information (ie, EHT-signal)”, “EHT-signal” may be proposed as an example of “control information”.

The following example of the present specification can be applied to various wireless communication systems. For example, the following example of the present specification may be applied to a wireless local area network (WLAN) system. For example, this specification may be applied to the IEEE 802.11a / g / n / ac standard, or the IEEE 802.11ax standard. In addition, the present specification may be applied to the newly proposed EHT standard or IEEE 802.11be standard. Also, an example of the present specification may be applied to a new wireless LAN standard that improves the EHT standard or IEEE 802.11be. Also, an example of the present specification may be applied to a mobile communication system. For example, it may be applied to a Long Term Evolution (LTE) based on the 3rd Generation Partnership Project (3GPP) standard and a mobile communication system based on its evolution. In addition, an example of the present specification may be applied to a 5G NR standard communication system based on the 3GPP standard.

Hereinafter, technical features to which the present specification can be applied will be described to describe the technical features of the specification.

1 shows an example of a transmitting device and / or a receiving device of the present specification.

The example of FIG. 1 can perform various technical features described below. 1 includes two stations (STA). STA (110, 120) of the present specification 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), a mobile subscriber unit (Mobile Subscriber Unit) or simply a user (user), etc. can also be called various names. STAs 110 and 120 of the present specification may be referred to as various names such as a network, a base station, a Node-B, an access point (AP), a repeater, a router, and a relay. The STAs 110 and 120 of the present specification may be called various names such as a receiving device, a transmitting device, a receiving STA, a transmitting STA, a receiving device, and a transmitting device.

For example, 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.

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. In addition, the STA of the present specification may support communication for various communication services such as voice calls, video calls, data communication, and self-driving, autonomous-driving.

In this specification, 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.

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.

For example, the first STA 110 may perform an intended operation of the AP. For example, 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.

For example, the second STA 120 may perform an intended operation of the Non-AP STA. For example, the non-AP transceiver 123 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.

For example, 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.

For example, the operation of the device indicated as the AP in the following specification may be performed in the first STA 110 or the second STA 120. For example, when the first STA 110 is an AP, the operation of the device indicated by the AP is controlled by the processor 111 of the first STA 110 and by the processor 111 of the first STA 110. Related signals may be transmitted or received via the controlled transceiver 113. In addition, 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. In addition, when the second STA 110 is an AP, the operation of the device indicated by the AP is controlled by the processor 121 of the second STA 120 and controlled by the processor 121 of the second STA 120. The related signal may be transmitted or received through the transceiver 123. In addition, control information related to the operation of the AP or the transmission / reception signal of the AP may be stored in the memory 122 of the second STA 110.

For example, the operation of the device indicated as non-AP (or User-STA) in the following specification may be performed by the first STA 110 or the second STA 120. For example, when the second STA 120 is non-AP, the operation of the device indicated as non-AP is controlled by the processor 121 of the second STA 120, and the processor of the second STA 120 ( 121), a related signal may be transmitted or received through the transceiver 123 controlled by the controller. In addition, control information related to the operation of the non-AP or the transmission / reception signal of the AP may be stored in the memory 122 of the second STA 120. For example, when the first STA 110 is a non-AP, the operation of the device indicated as non-AP is controlled by the processor 111 of the first STA 110, and the processor of the first STA 120 ( Related signals may be transmitted or received through the transceiver 113 controlled by 111). In addition, control information related to the operation of the non-AP or the transmission / reception signal of the AP may be stored in the memory 112 of the first STA 110.

In the following specification (transmission / reception) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmission / reception) Terminal, (transmission / reception) device , (Transmission / reception) apparatus, a device called a network, etc., may mean the STAs 110 and 120 of FIG. 1. For example, without specific reference numerals (transmission / reception) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmission / reception) Terminal, (transmission / Reception) device, (transmission / reception) apparatus, and a device displayed as a network may also mean STAs 110 and 120 of FIG. For example, in the following example, an operation in which various STAs transmit and receive signals (eg, PPPDUs) may be performed in the transceivers 113 and 123 of FIG. 1. In addition, in the following example, an operation in which various STAs generate a transmission / reception signal or perform data processing or calculation in advance for a transmission / reception signal may be performed in the processors 111 and 121 of FIG. 1. For example, an example of an operation of generating a transmission / reception signal or performing data processing or operation in advance for a transmission / reception signal is: 1) Determining bit information of a subfield (SIG, STF, LTF, Data) field included in a PPDU / Acquisition / Configuration / Calculation / Decoding / Encoding operation, 2) Time resource or frequency resource (for example, subcarrier resource) used for subfields (SIG, STF, LTF, Data) fields included in the PPDU. Determining / configuring / retrieving, 3) a specific sequence (eg, pilot sequence, STF / LTF sequence, applied to SIG) used for subfield (SIG, STF, LTF, Data) fields included in the PPDU Extra sequence), etc., determining / configuring / retrieving operations, 4) power control operations and / or power saving operations applied to STAs, 5) operations related to determination / acquisition / configuration / operation / decoding / encoding of ACK signals It can contain. In addition, in the following example, various information used by various STAs for determination / acquisition / configuration / operation / decoding / encoding of transmission / reception signals (for example, information related to fields / subfields / control fields / parameters / powers) It may be stored in the memory (112, 122) of FIG.

2 is a conceptual diagram showing the structure of a wireless LAN (WLAN).

The top of FIG. 2 shows the structure of an infrastructure basic service set (BSS) of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.

Referring to the top of FIG. 2, the wireless LAN system may include one or more infrastructure BSSs 200 and 205 (hereinafter, BSS). The BSSs 200 and 205 are 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 do 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.

The distributed system 210 may connect multiple BSSs 200 and 205 to implement an extended service set (ESS) 240. The 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).

In the BSS such as the top of FIG. 2, 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. However, it may be possible to perform communication by establishing a network even between STAs without APs 225 and 230. A network that establishes a network even between STAs without APs 225 and 230 to perform communication is defined as an ad-hoc network or an independent basic service set (BSS).

2 is a conceptual diagram showing the IBSS.

2, IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not include an AP, there is no centralized management entity performing central management functions. 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) can be made of mobile STAs, and access to a distributed system is not allowed, so a self-contained network network).

3 is a diagram for explaining a general link setup process.

In step S310, 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 joining 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.

3 illustrates a network discovery operation that includes an active scanning process by way of example. In active scanning, the STA performing scanning transmits a probe request frame and waits for a response to search for which AP is present 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. Here, the responder may be the STA that last transmitted a beacon frame from the BSS of the channel being scanned. In the BSS, 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. For example, an STA that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 stores BSS-related information included in the received probe response frame and stores the next channel (for example, number 2). Channel) to perform scanning (ie, probe request / response transmission / reception on channel 2) in the same manner.

Although not shown in the example of FIG. 3, 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. In the BSS, the AP serves to periodically transmit the beacon frame, and in the IBSS, STAs in the IBSS rotate and transmit the beacon frame. Upon receiving 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. This authentication process may be referred to as a first authentication process (first authentication) to clearly distinguish the security setup operation of step S340, which will be described later. The authentication process of S320 may include a process in which the STA transmits an authentication request frame to the AP, and in response, 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 authentication algorithm number, authentication transaction sequence number, status code, challenge text, robust security network (RSN), and 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 a result of the authentication process to the STA through an authentication response frame.

The successfully authenticated STA may perform a connection process based on step S330. The connection process includes a process in which the STA transmits an association request frame to the AP, and in response, the AP sends an association response frame to the STA. For example, 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. For example, the 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.

Thereafter, in 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 private key setup through 4-way handshaking through an Extensible Authentication Protocol over LAN (EAPOL) frame. .

4 is a diagram showing an example of a PPDU used in the IEEE standard.

As shown, various types of PDU 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 the receiving station, and the data fields contained user data corresponding to PSDU (MAC PDU / Aggregated MAC PDU). Was included.

4 also includes an example of the HE PPDU of the IEEE 802.11ax standard. The HE PPDU according to FIG. 4 is an example of a PPDU for multiple users, and 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.

As shown, HE-PPDU for multiple users (MU) 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. Each field may be transmitted during the illustrated time period (ie, 4 or 8 ms, etc.).

Hereinafter, a resource unit (RU) used in the PPDU will be described. 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. Resource units may be used for STF, LTF, data fields, and the like.

5 is a view showing the arrangement of a resource unit (RU) used on a 20MHz band.

As illustrated in FIG. 5, Resource Units (RUs) 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.

As shown at the top of FIG. 5, 26-units (i.e., units corresponding to 26 tones) can be arranged. 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. In addition, 7 DC tones are inserted in the central band, that is, the DC band, and 26-units corresponding to 13 tones may exist in the left and right sides of the DC band. In addition, 26-unit, 52-unit, and 106-unit may be allocated to other bands. Each unit can be assigned for a receiving station, ie a user.

Meanwhile, 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). In this case, as shown in the bottom of FIG. 5, one 242-unit is used. It is possible to use and in this case 3 DC tones can be inserted.

In the example of FIG. 5, various sizes of RUs, that is, 26-RUs, 52-RUs, 106-RUs, 242-RUs, etc. have been proposed. Since the specific sizes of these RUs can be expanded or increased, this embodiment Is not limited to the specific size of each RU (ie the number of corresponding tones).

6 is a view showing the arrangement of a resource unit (RU) used on the 40MHz band.

Just as RUs of various sizes are used in the example of FIG. 5, examples of FIG. 6 may also be 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, and the like. In addition, 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.

Also, as shown, 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.

7 is a view showing the arrangement of a resource unit (RU) used on the 80MHz band.

Just as RUs of various sizes are used in the examples of FIGS. 5 and 6, examples of FIG. 7 may also be 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. have. In addition, 7 DC tones may 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 in the rightmost band of the 80 MHz band. It can be used as a guard band. It is also possible to use 26-RUs with 13 tones located on the left and right sides of the DC band.

Also, as shown, when used for a single user, 996-RU can be used, in which case 5 DC tones can be inserted.

Meanwhile, the fact that the specific number of RUs can be changed is the same as the example of FIGS. 5 and 6.

The RU arrangement (ie, RU location) shown in FIGS. 5 to 7 may be applied to a new wireless LAN system (eg, an EHT system) as it is. Meanwhile, in the 160 MHz band supported by the new WLAN system, the arrangement of the RU for 80 MHz (that is, the example of FIG. 7) 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. In addition, when the EHT PPDU is configured in the 320 MHz band, 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 in this 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. For example, when UL-MU communication solicited by a trigger frame is performed, the transmitting STA (eg, AP) receives the first RU from the first STA through the trigger frame (eg, 26/52/106 / 242-RU, etc.), and the second STA may be allocated a second RU (for example, 26/52/106 / 242-RU). Thereafter, the first STA may transmit the first Trigger-based PPDU based on the first RU, and 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 interval.

For example, when a DL MU PPDU is configured, the transmitting STA (eg, AP) allocates a first RU (eg, 26/52/106 / 242-RU, etc.) to the first STA, and A second RU (eg, 26/52/106 / 242-RU, etc.) may be allocated to the 2 STAs. That is, the transmitting STA (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.

Information on the arrangement of the RU may be signaled through HE-SIG-B.

8 shows the structure of the HE-SIG-B field.

As shown, 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.

8, 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. For example, 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. .

An example of the case where the RU allocation information is composed of 8 bits is as follows.

As in the example of FIG. 5, up to nine 26-RUs may be allocated to a 20 MHz channel. When 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). In addition, when RU allocation information of the common field 820 is set as “00000001” as shown in Table 1, seven 26-RUs 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.

An example of Table 1 shows only a part of RU locations that can be displayed by RU allocation information.

For example, RU allocation information may 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 side. In this case, a number of STAs (eg, User-STA) may be allocated to the 106-RU based on the MU-MIMO technique. Specifically, for the 106-RU, 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) ). For example, when 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.

In general, a plurality of different STAs (eg, User STAs) may be assigned to a plurality of RUs. However, for one RU having a specific size (eg, 106 subcarriers) or more, a plurality of STAs (eg, User STAs) may be allocated based on the MU-MIMO technique.

As illustrated in FIG. 8, the user-individual field 830 may include a plurality of user fields. As described above, 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 can be assigned to a specific channel through a non-MU-MIMO technique.

For example, when the RU allocation is set to “01000y2y1y0”, 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. Five User STAs may be allocated through a non-MU-MIMO technique. This case is embodied through the example of FIG. 9.

9 shows an example in which a plurality of User STAs are allocated to the same RU through the MU-MIMO technique.

For example, when 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. You can. In addition, a total of three User STAs can be allocated to the 106-RU through the MU-MIMO technique. As a result, since a total of 8 User STAs are allocated, 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.

User fields shown 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).

Each User field may have the same size (for example, 21 bits). For example, the User Field of the first format (format of MU-MIMO technique) may be configured as follows.

For example, the first bit (eg, B0-B10) in the User field (ie, 21 bits) is the identification information of the User STA to which the corresponding User field is assigned (eg, STA-ID, partial AID, etc.) It may include. In addition, the second bit (eg, B11-B14) in the User field (ie, 21 bits) may include information regarding spatial configuration. Specifically, an example of the second bit (ie, B11-B14) may be as shown in Tables 3 to 4 below.

As shown in Table 3 and / or Table 4, the second bit (ie, B11-B14) may include information on the number of spatial streams allocated to a plurality of User STAs allocated according to the MU-MIMO technique. have. For example, when three User STAs are allocated to the 106-RU based on the MU-MIMO scheme as shown in FIG. 9, N_user is set to “3”, and accordingly, N_STS [1] as shown in Table 3, The values of N_STS [2] and N_STS [3] can be determined. For example, when the value of the second bit (B11-B14) is “0011”, N_STS [1] = 4, N_STS [2] = 1, and N_STS [3] = 1. That is, in the example of FIG. 9, four spatial streams may be allocated to user field 1, one spatial stream may be allocated to user field 2, and one spatial stream may be allocated to user field 3.

As an example of Table 3 and / or Table 4, information on the number of spatial streams for a user STA (ie, the second bit, B11-B14) may be composed of 4 bits. In addition, information on the number of spatial streams for the user station (user STA) (that is, the second bit, B11-B14) may support up to eight spatial streams. In addition, information on the number of spatial streams (ie, second bits, B11-B14) may support up to four spatial streams for one User STA.

In addition, the third bit (ie, B15-18) in the User field (ie, 21 bits) may include Modulation and Coding Scheme (MCS) information. MCS information can be applied to a data field in a PPDU that includes the corresponding SIG-B.

The MCS, MCS information, MCS index, and MCS field used in this specification may be indicated by specific index values. For example, MCS information may be indicated by index 0 to index 11. The MCS information includes information on the constellation modulation type (eg, BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, etc.), and coding rate (eg, 1/2, 2 / 3, 3/4, 5/6, etc.). MCS information may exclude information regarding a channel coding type (eg, BCC or LDPC).

Also, the fourth bit (ie, B19) in the User field (ie, 21 bits) may be a Reserved field.

In addition, the fifth bit (ie, B20) in the User field (ie, 21 bits) may include information regarding a coding type (eg, BCC or LDPC). That is, the fifth bit (ie, B20) may include information about the type of channel coding (eg, BCC or LDPC) applied to the data field in the PPDU including the corresponding SIG-B.

The above-described example relates to the User Field of the first format (format of MU-MIMO technique). An example of the User field in the second format (format of a non-MU-MIMO technique) is as follows.

The first bit (eg, B0-B10) in the User field of the second format may include identification information of the User STA. Also, the second bit (eg, B11-B13) in the User field of the second format may include information on the number of spatial streams applied to the corresponding RU. In addition, the third bit (eg, B14) in the user field of the second format may include information on whether a beamforming steering matrix is applied. The fourth bit (eg, B15-B18) in the User field of the second format may include Modulation and Coding Scheme (MCS) information. In addition, the fifth bit (eg, B19) in the User field of the second format may include information about whether Dual Carrier Modulation (DCM) is applied. Also, the sixth bit (ie, B20) in the User field of the second format may include information regarding a coding type (eg, BCC or LDPC).

10 shows the operation according to UL-MU. As illustrated, the transmitting STA (eg, AP) 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. When a PPDU including a trigger frame is received, a trigger-based (TB) PPDU is transmitted after a delay of SIFS.

TB PPDUs 1041 and 1042 are transmitted at the same time, and may be transmitted from a plurality of STAs (eg, User STAs) in which an AID is indicated in the Trigger frame 1030. The ACK frame 1050 for the TB PPDU can be implemented in various forms.

The specific features of the trigger frame are described with reference to FIGS. 11 to 13. Even when UL-MU communication is used, an orthogonal frequency division multiple access (OFDMA) technique or MU MIMO technique may be used, and OFDMA and MU MIMO techniques may be used simultaneously.

11 shows an example of a trigger frame. 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.

In addition, 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. Contains control information. For example, a 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) may include information that controls the content. In addition, as 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.

In addition, it is preferable to include individual user information (per user information) fields 1160 # 1 to 1160 # N corresponding to the number of receiving STAs receiving the trigger frame of FIG. 11. The individual user information field may be called an “assignment field”.

In addition, 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.

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 trigger frame, and the length field of the L-SIG field of the uplink PPDU indicates the length of the uplink PPDU. As a result, the length field 1210 of the trigger frame can be used to indicate the length of the corresponding uplink PPDU.

In addition, the 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). During the casecade operation, only one transmission device (eg, AP) performing downlink communication may exist, and a plurality of transmission devices (eg, non-AP) performing uplink communication may exist.

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 (that is, the HE-SIG-A field) of the uplink PPDU transmitted in response 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 corresponding 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.

In the present specification, it may be assumed that the trigger type field 1260 of the trigger frame indicates a basic type trigger frame for normal triggering. For example, a basic type trigger frame may be referred to as a basic trigger frame.

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 subfields included in the user information field 1300 of FIG. 13 may be omitted, and other subfields 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.

Also, 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. In this case, the RU indicated by the RU Allocation field 1320 may be the RU shown in FIGS. 5, 6, and 7.

The sub-field 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 may be set to '1', and when LDPC coding is applied, the coding type field 1330 may be set to '0'. have.

Also, 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 may be set to '1', and when LDPC coding is applied, the coding type field 1330 may be set to '0'. have.

Hereinafter, a UORA (UL OFDMA-based random access) technique will be described.

14 describes the technical features of the UORA technique.

The transmitting STA (eg, AP) may allocate 6 RU resources as illustrated in FIG. 14 through a trigger frame. Specifically, 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 resources (AID 2045, RU 5), the sixth RU resources (AID 3, RU 6) may be allocated. Information related to 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. AID = 0 may refer to a UORA resource for an associated STA, and AID = 2045 may refer to a UORA resource for a non-associated STA. Accordingly, the first to third RU resources of FIG. 14 may be used as a UORA resource for an associated STA, and the fourth to fifth RU resources of FIG. 14 for a non-associated STA It may be used as a UORA resource, and the sixth RU resource of FIG. 14 may be used as a resource for a normal UL MU.

In the example of FIG. 14, the ODMA (OFDMA random access BackOff) counter of STA1 is decreased to 0, so that STA1 randomly selects the second RU resources (AID 0 and RU 2). In addition, since the OBO counter of STA2 / 3 is larger than 0, uplink resources are not allocated to STA2 / 3. In addition, in FIG. 14, since the STA4 includes its own AID (that is, AID = 3) in the trigger frame, resources of RU 6 are allocated without backoff.

Specifically, since 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. In addition, since STA2 in FIG. 14 is an associated STA, there are a total of 3 eligible RA RUs for STA2 (RU 1, RU 2, and RU 3), and accordingly, STA2 reduces the OBO counter by 3, but the OBO counter is 0. It is in a larger state. In addition, since STA3 of FIG. 14 is a non-associated STA, there are a total of two eligible RA RUs for STA3 (RU 4 and RU 5), and accordingly, STA3 reduces the OBO counter by 2, but the OBO counter is It is greater than zero.

15 shows an example of channels used / supported / defined within the 2.4 GHz band.

The 2.4 GHz band may be referred to by other names such as the first band (band). In addition, the 2.4 GHz band may mean a frequency domain 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). For example, 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, and 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 center frequency can be changed.

15 exemplarily shows four channels in the 2.4 GHz band. The illustrated first frequency domain 1510 to the fourth frequency domain 1540 may each include one channel. For example, the first frequency domain 1510 may include a channel 1 (20 MHz channel having an index of 1). At this time, the center frequency of channel 1 may be set to 2412 MHz. The second frequency domain 1520 may include channel 6. At this time, the center frequency of channel 6 may be set to 2437 MHz. The third frequency domain 1530 may include channel 11. At this time, 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. Alternatively, 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.

A 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. For example, 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. Alternatively, the 5170 MHz to 5330 MHz frequency domain / range may be divided into one channel through the 160 MHz frequency domain.

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.

For example, the 20 MHz channel in FIG. 17 may be defined from 5.940 GHz. Specifically, 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.

Accordingly, 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. In addition, according to the above (5.940 + 0.005 * N) GHz rule, 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.

In the example of FIG. 17, 20, 40, 80, and 160 MHz channels are shown, but additionally, 240 MHz channels or 320 MHz channels may be added.

Hereinafter, a PPDU transmitted / received by the STA of the present specification is described.

18 shows an example of a PPDU used in the present specification.

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. In addition, it can be used in a new wireless LAN system with an improved EHT system and / or EHT system.

The sub-field of FIG. 18 may be changed to various names. For example, 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, and 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 determined as 312.5 kHz, and the subcarrier spacing of the STF, LTF, and Data fields may be determined as 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. For example, 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. For example, the 12-bit Length field may include information on the number of octets of the Physical Service Data Unit (PSDU). For example, 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. For example, when the PPDU is an HE PPDU, the value of the Length field may be determined as “multiple of 3 + 1” or “multiple of 3 +2”. In other words, the value of the Length field can be determined as a multiple of 3 for a non-HT, HT, VHT PPDU or EHT PPDU, and the value of the Length field for a HE PPDU is a multiple of 3 + 1 or multiple of 3 +2 ”.

For example, 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 coded 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 other than the pilot subcarrier {subcarrier index -21, -7, +7, +21} and DC subcarrier {subcarrier index 0}. As a result, 48 BPSK symbols can be mapped to subcarrier indexes -26 to -22, -20 to -8, -6 to -1, +1 to +6, +8 to +20, and +22 to +26. have. 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 may be 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.

After RL-SIG of FIG. 18, for example, EHT-SIG-A or one control symbol may be inserted. The symbol (that is, 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. For example, if the EHT PPDU is divided into various types (e.g., EHT PPDU supporting SU, EHT PPDU supporting MU, EHT PPDU related to Trigger Frame, EHT PPDU related to Extended Range transmission, etc.) , EHT PPDU type information may be included in a symbol subsequent to the RL-SIG.

The symbol subsequent to the RL-SIG may include, for example, information about the length of the TXOP and information about the BSS color ID. For example, a SIG-A field may be configured in succession to a symbol (eg, one control symbol) consecutive to RL-SIG. Alternatively, a symbol subsequent to RL-SIG may be a SIG-A field.

For example, 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 and CP length of the LTF.

SIG-B of FIG. 18 may include the technical features of HE-SIG-B shown in the example of FIGS. 8 to 9 as it is.

The STF of FIG. 18 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or 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. For example, a first type (that is, 1x STF) among STFs may be generated based on a first type STF sequence in which non-zero coefficients are arranged at 16 subcarrier intervals. The STF signal generated based on the first type STF sequence may have a period of 0.8 μs, and the period signal of 0.8 μs may be repeated 5 times to become a first type STF having a length of 4 μs. For example, a second type (that is, 2x 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 μs, and the period signal of 1.6 μs may be repeated 5 times to become a second type EHT-STF having a length of 8 μs. For example, a third type of STF (ie, 4x EHT-STF) may be generated based on a third type STF sequence in which non-zero coefficients are arranged at four subcarrier intervals. The STF signal generated based on the third type STF sequence may have a period of 3.2 μs, and the period signal of 3.2 μs may be repeated 5 times to become a third type EHT-STF having a length of 16 μs. Only some of the above-described first to third types of EHT-STF sequences may be used. In addition, the EHT-LTF field may have first, second, and third types (ie, 1x, 2x, 4x LTF). For example, 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 μs. In addition, various lengths of GI (eg, 0.8 / 1/6 / 3.2 μs) may be applied to the first / second / third type LTF.

Information about the type of STF and / or LTF (including information on GI applied to LTF) may be included in the SIG A field and / or the SIG B field of FIG. 18.

The PPDU of FIG. 18 can support various bandwidths. For example, the PPDU of FIG. 18 may have a bandwidth of 20/40/80/160/240/320 MHz. For example, some of the fields of FIG. 18 (eg, STF, LTF, data) may be configured based on the RU shown in FIGS. 5 to 7 and the like. For example, if there is one receiving STA of the PPDU of FIG. 18, all fields of the PPDU of FIG. 18 may occupy the entire bandwidth. For example, when there are multiple receiving STAs of the PPDU of FIG. 18 (that is, when an MU PPDU is used), some fields (eg, STF, LTF, data) of FIG. 18 are illustrated in FIGS. 5 to 7 and the like. It can be configured based on the RU. For example, the STF, LTF, and data fields for the first receiving STA of the PPDU may be transmitted and received through the first RU, and the STF, LTF, and data fields for the second receiving STA of the PPDU may be transmitted and received through the second RU. Can be. In this case, the location of the first / second RU may be determined based on FIGS. 5 to 7 and the like.

The PPDU of FIG. 18 may be determined (or identified) as an EHT PPDU based on the following method.

The receiving STA may determine the type of the received PPDU as the EHT PPDU based on the following. 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. 18, and the type of the EHT PPDU (for example, SU / MU / Trigger-based / Extended Range type) ) Can be detected. In other words, 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.

For example, 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.

For example, 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 where the L-SIG is repeated is not detected, and 3) “modulo 3” for the length value of the L-SIG. When the applied result is detected as “0”, the received PPDU may be determined as non-HT, HT and VHT PPDU.

In the following example, the signal represented by the (send and receive) signal, (send and receive) frame, (send and receive) packet, (send and receive) data unit, (send and receive) data, etc. may be a signal transmitted and received based on the PPDU of FIG. 18. The PPDU of FIG. 18 can be used to transmit and receive various types of frames. For example, the PPDU of FIG. 18 can be used for a control frame. Examples of the control frame may include a request to send (RTS), a clear to send (CTS), a Power Save-Poll (PS-Poll), a BlockACKReq, a BlockAck, a NDP (Null Data Packet) announcement, and a Trigger Frame. For example, the PPDU of FIG. 18 can be used for a management frame. An example of a management frame may include a Beacon frame, (Re-) Association Request frame, (Re-) Association Response frame, Probe Request frame, Probe Response frame. For example, the PPDU of FIG. 18 can be used for a data frame. For example, the PPDU of FIG. 18 may be used to simultaneously transmit at least two or more of a control frame, a management frame, and a data frame.

An example of the present specification can improve the example of Table 3 and / or Table 4 described above. Specifically, we propose a new signaling technique that can be applied to a new standard that further improves the EHT standard or the EHT standard. Specifically, the new wireless LAN standard to which the present specification can be applied may include various technical features (eg, up to 320 MHz channel, up to 16 spatial stream support, multi-link communication) to provide a higher data rate. .

Specifically, the new wireless LAN standard can support up to 16 spatial streams for one user STA in single-user (SU) communication or non-MU-MIMO communication. In addition, the new wireless LAN standard can support up to 8 spatial streams for one User STA in MU-MIMO communication. The example in Table 3 / Table 4 supports up to 8 spatial streams (up to 4 for one User STA) in MU-MIMO communication, but the example of Table 3 / Table 4 cannot support the new wireless LAN standard. The problem arises. Accordingly, this specification proposes the following improved information fields. The following information field may be composed of N bits (for example, 8 bits). The following information field includes information on the number of spatial streams for a user STA. The following information field may be included in a user-specific control field of the SIG field (eg, EHT-SIG-A / B / C). That is, the SIG field (eg, EHT-SIG-A / B / C) used in the present specification may include features of the example of FIG. 18.

As described above, the new WLAN standard can support up to 16 spatial streams for one User STA in single-user (SU) communication or non-MU-MIMO communication. In addition, the new wireless LAN standard can support up to 8 spatial streams for one User STA in MU-MIMO communication. In this case, an information field including information on the number of spatial streams for a user STA may be set in consideration of the following technical features.

Table 5 shows various examples of the number of spatial streams that can be allocated to each user STA when the total number of user STAs to which MU-MIMO is applied is 2. As shown in Table 5, when the total number of user STAs to which MU-MIMO is applied is 2, the total number of cases related to spatial streams allocated to each user STA is 36 (= 8 + 7 + 6 + 5 + 4) + 3 + 2 + 1).

N STS [1]	N STS [2]	Total N STS	Number of entries
1-8	One	2-9	8
2-8	2	4-10	7
3-8	3	6-11	6
4-8	4	8-12	5
5-8	5	10-13	4
6-8	6	12-14	3
7-8	7	14-15	2
8	8	16	One

Table 6 shows an example in which the total number of user STAs to which MU-MIMO is applied is 3. As shown in Table 6, when the total number of user STAs to which MU-MIMO is applied is 3, the total number of cases related to spatial streams allocated to each user STA is 89.

N STS [1]	N STS [2]	N STS [3]	Total N STS	Number of entries
1-8	One	One	3-10	8
2-8	2	One	5-11	7
3-8	3	One	7-12	6
4-8	4	One	9-13	5
5-8	5	One	11-14	4
6-8	6	One	13-15	3
7-8	7	One	15-16	2
2-8	2	2	6-12	7
3-8	3	2	8-13	6
4-8	4	2	10-14	5
5-8	5	2	12-15	4
6-8	6	2	14-16	3
7	7	2	16	One
3-8	3	3	9-14	6
4-8	4	3	11-15	5
5-8	5	3	13-16	4
6-7	6	3	15-16	2
4-8	4	4	12-16	5
5-7	5	4	14-16	3
6	6	4	16	One
5-6	5	5	15-16	2

Table 7 shows an example in which the total number of user STAs to which MU-MIMO is applied is 4. As shown in Table 7, when the total number of user STAs to which MU-MIMO is applied is 4, the total number of cases related to spatial streams allocated to each user STA is 129.

Nsts 1	Nsts 2	Nsts 3	Nsts 4	Total Nsts	N_entry
1-8	One	One	One	4-11	8
2-8	2	One	One	6-12	7
3-8	3	One	One	8-13	6
4-8	4	One	One	10-14	5
5-8	5	One	One	12-15	4
6-8	6	One	One	14-16	3
7	7	One	One	16	One
2-8	2	2	One	7-13	7
3-8	3	2	One	9-14	6
4-8	4	2	One	11-15	5
5-8	5	2	One	13-16	4
6-7	6	2	One	15-16	2
3-8	3	3	One	10-15	6
4-8	4	3	One	12-16	5
5-7	5	3	One	14-16	3
6	6	3	One	16	One
4-7	4	4	One	13-16	4
5-6	5	4	One	15-16	2
5	5	5	One	16	One
2-8	2	2	2	8-14	7
3-8	3	2	2	10-15	6
4-8	4	2	2	12-16	5
5-7	5	2	2	14-16	3
3-8	3	3	2	11-16	6
4-7	4	3	2	13-16	4
5-6	5	3	2	15-16	2
4-6	4	4	2	14-16	3
5	5	4	2	16	One
3-7	3	3	3	12-16	5
4-6	4	3	3	14-16	3
5	5	3	3	16	One
4-5	4	4	3	15-16	2
4	4	4	4	16	One

Table 8 is an example of a case where the total number of user STAs to which MU-MIMO is applied is 5. As shown in Table 8, when the total number of user STAs to which MU-MIMO is applied is 5, the total number of cases related to spatial streams allocated to each user STA is 135.

Nsts 1	Nsts 2	Nsts 3	Nsts 4	Nsts 5	Total Nsts	N_entry
1-8	One	One	One	One	5-12	8
2-8	2	One	One	One	7-13	7
3-8	3	One	One	One	9-14	6
4-8	4	One	One	One	11-15	5
5-8	5	One	One	One	13-16	4
6-7	6	One	One	One	15-16	2
2-8	2	2	One	One	8-14	7
3-8	3	2	One	One	10-15	6
4-8	4	2	One	One	12-16	5
5-7	5	2	One	One	14-16	3
6	6	2	One	One	16	One
3-8	3	3	One	One	11-16	6
4-7	4	3	One	One	13-16	4
5-6	5	3	One	One	15-16	2
4-5	4	4	One	One	14-15	2
5	5	4	One	One	16	One
2-8	2	2	2	One	9-15	7
3-8	3	2	2	One	11-16	6
4-7	4	2	2	One	13-16	4
5-6	5	2	2	One	15-16	2
3-7	3	3	2	One	12-16	5
4-6	4	3	2	One	14-16	3
5	5	3	2	One	16	One
4-5	4	4	2	One	15-16	2
3-6	3	3	3	One	13-16	4
4-5	4	3	3	One	15-16	2
4	4	4	3	One	16	One
2-8	2	2	2	2	10-16	7
3-7	3	2	2	2	12-16	5
4-6	4	2	2	2	14-16	3
5	5	2	2	2	16	One
3-6	3	3	2	2	13-16	4
4-5	4	3	2	2	15-16	2
4	4	4	2	2	16	One
3-5	3	3	3	2	14-16	3
4	4	3	3	2	16	One
3-4	3	3	3	3	15-16	2

Table 9 shows an example in which the total number of user STAs to which MU-MIMO is applied is 6. As shown in Table 9, when the total number of user STAs to which MU-MIMO is applied is 6, the total number of cases related to spatial streams allocated to each user STA is 119.

Nsts [1]	Nsts [2]	Nsts [3]	Nsts [4]	Nsts [5]	Nsts [6]	Total Nsts	N_entry
1-8	One	One	One	One	One	6-13	8
2-8	2	One	One	One	One	8-14	7
3-8	3	One	One	One	One	10-15	6
4-8	4	One	One	One	One	12-16	5
5-7	5	One	One	One	One	14-16	3
6	6	One	One	One	One	16	One
2-8	2	2	One	One	One	9-15	7
3-8	3	2	One	One	One	11-16	6
4-7	4	2	One	One	One	13-16	4
5-6	5	2	One	One	One	15-16	2
3-7	3	3	One	One	One	12-16	5
4-6	4	3	One	One	One	14-16	3
5	5	3	One	One	One	16	One
4-5	4	4	One	One	One	15-16	2
2-8	2	2	2	One	One	10-16	7
3-7	3	2	2	One	One	12-16	5
4-6	4	2	2	One	One	14-16	3
5	5	2	2	One	One	16	One
3-6	3	3	2	One	One	13-16	4
4-5	4	3	2	One	One	15-16	2
4	4	4	2	One	One	16	One
3-5	3	3	3	One	One	14-16	4
4	4	3	3	One	One	16	One
2-7	2	2	2	2	One	11-16	6
3-6	3	2	2	2	One	13-16	4
4-5	4	2	2	2	One	15-16	2
3-5	3	3	2	2	One	14-16	3
4	4	3	2	2	One	16	One
3-4	3	3	3	2	One	15-16	2
3	3	3	3	3	One	16	One
2-6	2	2	2	2	2	12-16	5
3-5	3	2	2	2	2	14-16	3
4	4	2	2	2	2	16	One
3-4	3	3	2	2	2	15-16	2
3	3	3	3	2	2	16	One

Table 10 is an example of a case where the total number of user STAs to which MU-MIMO is applied is 7. As shown in Table 10, when the total number of user STAs to which MU-MIMO is applied is 7, the total number of cases related to spatial streams allocated to each user STA is 89.

Nsts [1]	Nsts [2]	Nsts [3]	Nsts [4]	Nsts [5]	Nsts [6]	Nsts [7]	Total Nsts	N_entry
1-8	One	One	One	One	One	One	7-14	8
2-7	2	One	One	One	One	One	9-14	6
3-8	3	One	One	One	One	One	11-16	6
4-7	4	One	One	One	One	One	13-16	4
5-6	5	One	One	One	One	One	15-16	2
2-8	2	2	One	One	One	One	10-16	7
3-7	3	2	One	One	One	One	12-16	5
4-6	4	2	One	One	One	One	14-16	3
5	5	2	One	One	One	One	16	One
3-6	3	3	One	One	One	One	13-16	4
4-5	4	3	One	One	One	One	15-16	2
4	4	4	One	One	One	One	16	One
2-7	2	2	2	One	One	One	11-16	6
3-6	3	2	2	One	One	One	13-16	4
4-5	4	2	2	One	One	One	15-16	2
3-5	3	3	2	One	One	One	14-16	3
3-4	3	3	3	One	One	One	15-16	2
2-6	2	2	2	2	One	One	12-16	5
3-5	3	2	2	2	One	One	14-16	3
3-4	3	3	2	2	One	One	15-16	2
3	3	3	3	2	One	One	16	One
2-5	2	2	2	2	2	One	13-16	4
3-4	3	2	2	2	2	One	15-16	2
3	3	3	2	2	2	One	16	One
2-4	2	2	2	2	2	2	14-16	3
2-3	3	2	2	2	2	2	15-16	2

Table 11 shows an example in which the total number of user STAs to which MU-MIMO is applied is 8. As shown in Table 11, when the total number of user STAs to which MU-MIMO is applied is 8, the total number of cases related to spatial streams allocated to each user STA is 65.

Nsts [1]	Nsts [2]	Nsts [3]	Nsts [4]	Nsts [5]	Nsts [6]	Nsts [7]	Nsts [8]	Total Nsts	N_entry
1-8	One	One	One	One	One	One	One	8-15	8
2-8	2	One	One	One	One	One	One	10-16	7
3-7	3	One	One	One	One	One	One	12-16	5
4-6	4	One	One	One	One	One	One	14-16	3
5	5	One	One	One	One	One	One	16	One
2-7	2	2	One	One	One	One	One	11-16	6
3-6	3	2	One	One	One	One	One	13-16	4
4-5	4	2	One	One	One	One	One	15-16	2
4-5	3	3	One	One	One	One	One	15-16	2
4	4	3	One	One	One	One	One	16	One
2-6	2	2	2	One	One	One	One	12-16	5
3-5	3	2	2	One	One	One	One	14-16	3
4	4	2	2	One	One	One	One	16	One
3-4	3	3	2	One	One	One	One	15-16	2
3	3	3	3	One	One	One	One	16	One
2-5	2	2	2	2	One	One	One	13-16	4
3-4	3	2	2	2	One	One	One	15-16	2
3	3	3	2	2	One	One	One	16	One
2-4	2	2	2	2	2	One	One	14-16	3
3	3	2	2	2	2	One	One	16	One
2-3	2	2	2	2	2	2	One	15-16	2
2	2	2	2	2	2	2	2	16	One

Table 12 is an example of a case where the total number of user STAs to which MU-MIMO is applied is 9. As shown in Table 12, when the total number of user STAs to which MU-MIMO is applied is 9, the total number of cases related to spatial streams allocated to each user STA is 44.

Nsts [1]	Nsts [2]	Nsts [3]	Nsts [4]	Nsts [5]	Nsts [6]	Nsts [7]	Nsts [8]	Nsts [9]	Total Nsts	N_entry
1-8	One	One	One	One	One	One	One	One	9-16	8
2-7	2	One	One	One	One	One	One	One	11-16	6
3-6	3	One	One	One	One	One	One	One	13-16	4
4-5	4	One	One	One	One	One	One	One	15-16	2
2-6	2	2	One	One	One	One	One	One	12-16	5
3-5	3	2	One	One	One	One	One	One	14-16	3
4	4	2	One	One	One	One	One	One	16	One
3-4	3	3	One	One	One	One	One	One	15-16	2
2-5	2	2	2	One	One	One	One	One	13-16	4
3-4	3	2	2	One	One	One	One	One	15-16	2
2-4	2	2	2	2	One	One	One	One	14-16	3
3	3	2	2	2	One	One	One	One	16	One
2-3	2	2	2	2	2	One	One	One	15-16	2
2	2	2	2	2	2	2	One	One	16	One

Table 13 is an example of a case where the total number of user STAs to which MU-MIMO is applied is 10. As shown in Table 13, when the total number of user STAs to which MU-MIMO is applied is 10, the total number of cases related to spatial streams allocated to each user STA is 28.

Nsts [1]	Nsts [2]	Nsts [3]	Nsts [4]	Nsts [5]	Nsts [6]	Nsts [7]	Nsts [8]	Nsts [9]	Nsts [10]	Total Nsts	N_entry
1-7	One	One	One	One	One	One	One	One	One	10-16	5
2-6	2	One	One	One	One	One	One	One	One	12-16	5
3-5	3	One	One	One	One	One	One	One	One	14-16	3
4	4	One	One	One	One	One	One	One	One	16	One
2-5	2	2	One	One	One	One	One	One	One	13-16	4
3-4	3	2	One	One	One	One	One	One	One	15-16	2
3	3	3	One	One	One	One	One	One	One	16	One
2-4	2	2	2	One	One	One	One	One	One	14-16	3
3	3	2	2	One	One	One	One	One	One	16	One
2-3	2	2	2	2	One	One	One	One	One	15-16	2
2	2	2	2	2	2	One	One	One	One	16	One

Table 14 is an example of a case where the total number of user STAs to which MU-MIMO is applied is 11. As shown in Table 14, when the total number of user STAs to which MU-MIMO is applied is 11, the total number of cases related to spatial streams allocated to each user STA is 19.

Nsts [1]

Nsts [2]

Nsts [3]

Nsts [4]

Nsts [5]

Nsts [6]

Nsts [7]

Nsts [8]

Nsts [9]

Nsts [10]

Nsts [11]

Total Nsts

N_entry

1-6

One

One

One

One

One

One

One

One

One

One

11-16

6

2-5

2

One

One

One

One

One

One

One

One

One

13-16

4

3-4

3

One

One

One

One

One

One

One

One

One

15-16

2

2-4

2

2

One

One

One

One

One

One

One

One

14-16

3

3

3

2

One

One

One

One

One

One

One

One

16

One

2-3

2

2

2

One

One

One

One

One

One

One

15-16

2

2

2

2

2

2

One

One

One

One

One

One

16

One

Table 15 is an example of a case where the total number of user STAs to which MU-MIMO is applied is 12. As shown in Table 15, when the total number of user STAs to which MU-MIMO is applied is 12, the total number of cases related to spatial streams allocated to each user STA is 12.

Nsts [1]

Nsts [2]

Nsts [3]

Nsts [4]

Nsts [5]

Nsts [6]

Nsts [7]

Nsts [8]

Nsts [9]

Nsts [10]

Nsts [11]

Nsts [12]

Total Nsts

N_entry

1-5

One

One

One

One

One

One

One

One

One

One

One

12-16

5

2-4

2

One

One

One

One

One

One

One

One

One

One

14-16

3

3

3

One

One

One

One

One

One

One

One

One

One

16

One

2-3

2

2

One

One

One

One

One

One

One

One

One

15-16

2

2

2

2

2

One

One

One

One

One

One

One

One

16

One

Table 16 is an example of a case where the total number of user STAs to which MU-MIMO is applied is 13. As shown in Table 16, when the total number of user STAs to which MU-MIMO is applied is 13, the total number of cases related to spatial streams allocated to each user STA is seven.

Nsts [1]

Nsts [2]

Nsts [3]

Nsts [4]

Nsts [5]

Nsts [6]

Nsts [7]

Nsts [8]

Nsts [9]

Nsts [10]

Nsts [11]

Nsts [12]

Nsts [13]

Total Nsts

N_entry

1-4

One

One

One

One

One

One

One

One

One

One

One

One

13-16

4

2-3

2

One

One

One

One

One

One

One

One

One

One

One

15-16

2

2

2

2

One

One

One

One

One

One

One

One

One

One

16

One

Table 17 is an example of a case in which the total number of user STAs to which MU-MIMO is applied is 14. As shown in Table 17, when the total number of user STAs to which MU-MIMO is applied is 14, the total number of cases related to spatial streams allocated to each user STA is four.

Nsts [1]

Nsts [2]

Nsts [3]

Nsts [4]

Nsts [5]

Nsts [6]

Nsts [7]

Nsts [8]

Nsts [9]

Nsts [10]

Nsts [11]

Nsts [12]

Nsts [13]

Nsts [14]

Total Nsts

N_entry

1-3

One

One

One

One

One

One

One

One

One

One

One

One

One

14-16

3

2

2

One

One

One

One

One

One

One

One

One

One

One

One

16

One

Table 18 is an example of a case where the total number of user STAs to which MU-MIMO is applied is 15. As shown in Table 18, when the total number of user STAs to which MU-MIMO is applied is 15, the total number of cases related to spatial streams allocated to each user STA is two.

Nsts [1]

Nsts [2]

Nsts [3]

Nsts [4]

Nsts [5]

Nsts [6]

Nsts [7]

Nsts [8]

Nsts [9]

Nsts [10]

Nsts [11]

Nsts [12]

Nsts [13]

Nsts [14]

Nsts [15]

Total Nsts

N_entry

1-2

One

One

One

One

One

One

One

One

One

One

One

One

One

One

15-16

2

Table 19 is an example of a case where the total number of user STAs to which MU-MIMO is applied is 16. As shown in Table 19, when the total number of user STAs to which MU-MIMO is applied is 16, the total number of cases related to spatial streams allocated to each user STA is one.

Nsts [1]

Nsts [2]

Nsts [3]

Nsts [4]

Nsts [5]

Nsts [6]

Nsts [7]

Nsts [8]

Nsts [9]

Nsts [10]

Nsts [11]

Nsts [12]

Nsts [13]

Nsts [14]

Nsts [15]

Nsts [16]

Total Nsts

N_entry

One

One

One

One

One

One

One

One

One

One

One

One

One

One

One

One

16

One

As shown in Tables 5 to 19, a plurality of bits are required to include information on spatial streams allocated to up to 16 User STAs. That is, for example, in order to indicate the case of Table 5, bits representing 36 cases are required. In the example of Table 5 to Table 19, the most number of cases to be displayed is the case of Table 8 (that is, when 5 User STAs are supported). That is, when 5 user STAs are supported, a total of 135 cases occur. Accordingly, the information field of the present specification may be composed of 8 bits.

That is, when transmitting and receiving a signal using a maximum of 16 streams for MU-MIMO transmission, information on a stream corresponding to a user STA may be identified as shown in Table 20 below. That is, as shown in Table 20, based on the total number of User STAs (N_user) through 8-bit information, a combination of different stream numbers of the same bit information may be displayed.

The 8-bit information as shown in Table 20 below may be included in the User field in the User Specific field 930 shown in FIG. 9. In addition, the total number of User STAs (N_user) shown in Table 20 may be included in the RU allocation information in the Common field 920 shown in FIG. 9. For example, as illustrated in FIG. 10, information related to the total number of user STAs (N_user) may be included in RU allocation information in the common field 920 through 3-bit information of “y2y1y0”.

Specific values in Table 20 below may be changed. For example, in an N_user = 2 situation, a specific value of 8-bit information may be preset as “00000000-00000111” to indicate the case of Nsts [2] = 1 and Nsts [1] = 1-8, The specific value of the 8-bit information can be changed. For example, any eight values other than “00000000-00000111” can be used.

As described above, the SIG field of the new standard may include the technical features of FIGS. 8/9. That is, the new SIG field may include a number of User fields as shown in FIG. 9. In addition, the User field 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.

An example of the User field set in the second format may include the following bits. For example, the user field of the second format is a) identification information of the user STA, b) information on the number of spatial streams applied to the corresponding RU through 4 bit information, c) beamforming steering matrix is applied Information about whether or not to be applied, d) information about MCS applied to a data field, e) information about whether Dual Carrier Modulation (DCM) is applied, and / or f) coding type applied to a data field (for example , BCC or LDPC). As described above, since the number of spatial streams can be up to 16, it is preferable that the user field of the second format indicates information on the number of spatial streams through 4 bit information (not 3 bits).

An example of a User field set in the first format is shown in Table 21 below. Since at least one of the information elements in Table 21 can be used, some of the bits in Table 21 may be omitted / modified.

Bit	Subfield	Number of bits	Description
B0-B10	STA-ID	11	Set to a value of element indicated from TXVECTOR parameter STA_ID_LIST
B11	16 stream	One	Indicates the size of table for spatial configuration Set to 1 for 8bit indicationSet to 0 for 4 bit indication
B12-B17		Spatial Configuration	4/8	Indicates the number of spatial streams for a STA in an MU-MIMO allocation If 16 stream equal to 0, it uses the only 4bit of MSB / LSB on 8bits
B18-B21		MCS	4	Modulation and coding scheme. Set to n for MCS n , where n = 0, 1, 2,… 11 Values 12 to 15 are reserved
B22	Coding	One	Indicates whether BCC or LDPC is used. Set to 0 for BCC Set to 1 for LDPC

In Table 21, the information of B0-B10, the information of B18-B21, and the information of B22 may be the same as the first bit, third bit, and fifth bit described in the example of FIG. 9.

User STA and / or AP may support up to 8 spatial streams according to the IEEE 802.11ax standard (or previous WLAN standard), or up to 16 spatial streams according to the IEEE 802.11be standard (or a new standard that improves this) You can apply. In addition, when up to 8 spatial streams are supported as described above, information on the number of spatial streams allocated to the user STA may be transmitted through 4 bit information as described in Tables 3 and 4 above. However, when a maximum of 16 spatial streams are supported, information on the number of spatial streams allocated to the user STA should be transmitted through 8-bit information as shown in Table 20 above.

That is, whether information regarding the number of spatial streams allocated to the user STA is configured as a first type (for example, 4-bit information such as Table 3 and Table 4) or a second type (for example, as shown in Table 20) 8 bit information) is preferably transmitted. To this end, an example in Table 21 proposes the B11 bit. When B11 is set to a first value (for example, 1), up to 16 spatial stream-supported spatial setting information (that is, 8-bit information such as Table 20) is included, and B11 is a second value (for example, If set to 0), up to 8 spatial stream supported spatial setting information (ie, 4 bit information such as Table 3/4) may be included. Information regarding the number of spatial streams allocated to the user STA may be signaled through B12-B17 bits. If 4-bit information is used for space setting, only some of the B12-B17 (MSB / LSB) can be used.

When a User STA is configured based on an example of Table 21, in the memory of the User STA, information about the first look-up table as shown in Table 3/4 and information about the second look-up table as shown in Table 20 Can be stored. However, it may be inefficient to include information on lookup tables that are distinguished from each other in the User STA.

That is, depending on the capablity of the user STA, it may be inefficient for the user STA to acquire a space setting through 4 bit information or a space setting through 8 bit information. Accordingly, even if the user STA supports up to 8 spatial streams, an additional example of obtaining a space setting through 8-bit information may be required.

Accordingly, an example of Table 21 may be modified as follows. In the following example, even if the user STA supports up to 8 spatial streams, an example of obtaining a space setting through 8-bit information is proposed.

First, as a first example, a technique using only a part (eg, MSB 4 bits or LSB 4 bits) of the 8-bit information field (ie, 8-bit sequence) of Table 20 may be proposed. That is, the user STA supporting up to 16 spatial streams acquires the number of spatial streams allocated to the user STA based on the 8-bit information field, and the user STA supporting up to 8 spatial streams has any of the 8-bit information fields. The number of spatial streams allocated to the user STA may be obtained based on only 4 bits (eg, MSB 4 bits or LSB 4 bits).

To this end, specific values in Table 20 may be changed as shown in Table 22 below.

Table 22 is an example in which two User STAs are allocated based on MU-MIMO.

N_user	bits	Nsts [1]	Nsts [2]
2	00000000-00000011	1-4	One
	00000100-00000110	2- 4	2
	00000111-00001000	3-4	3
	00001001	4	4
	00001010-00001101	5- 8	One
	00001110-00010001	5- 8	2
	00010010-00010101	5- 8	3
	00010110-00011001	5-8	4
	00011010-00011101	5-8	5
	00011110-00100000	6-8	6
	00100001-00100010	7-8	7
	00100011	8	8

In the example of Table 22, when only the last 4 bits are used among 8-bit sequences, a situation supporting up to 8 spatial streams can be identified. That is, when the last 4 bits of the 8-bit sequence are indicated as “0000” to “1001”, the number of all cases for two User STAs may be signaled. That is, if the last 4 bits of the 8-bit sequence in Table 22 is set to “0000”-“1001”, the 4-bit sequence in Table 3 (when N_user = 2 in Table 3) is changed to “0000”-“1001”. The same space setting as when it is set may be indicated.

That is, if the specific values in Table 20 are changed, the last 4 bits of the 8-bit sequence are used for a user STA supporting up to 8 spatial streams, and all of the 8-bit sequences are used for a user STA supporting up to 16 spatial streams. You can.

When the above first example is used, the B12-B17 bit of the example of Table 21 may include the example of Table 22. In addition, in Table 21, the B11 bit may be omitted or may be included for explicit signaling use for the User STA.

In addition, additional modifications to Table 21 are possible.

In the second example, a user STA supporting up to 16 spatial streams uses an 8-bit sequence, and a user STA supporting up to 8 spatial streams also uses an 8-bit sequence. In other words, a user STA supporting up to 8 spatial streams may use a part of the lookup table of Table 20 without using the lookup table of Table 3 / Table 4. For example, when two User STAs are allocated for the MU-MIMO technique, a User STA supporting up to 16 spatial streams uses the following 8-bit sequence based on Table 23 (which is part of Table 20). Can be used to obtain space settings.

N-user	bits	Nsts [1]	Nsts [2]
2	00000000-00000111	1-8	One
	00001000-00001110	2- 8	2
	00001111-00010100	3-8	3
	00010101-00011001	4- 8	4
	00011010-00011101	5- 8	5
	00011110-00100000	6-8	6
	00100001-00100010	7-8	7
	00100011	8	8

If the user STA supports only up to 8 spatial streams, it is not necessary to be used when the 8-bit sequence from “00011011” to “00100011” in the above table. Accordingly, a user STA supporting up to 8 spatial streams can use only the lookup table in Table 24 below. That is, it is possible to use only a legacy user STA (ie, a user STA supporting up to 8 spatial streams) among the bit values in Table 20. Accordingly, the legacy User STA may store only part of Table 20 in memory, not all of Table 20, and instead, the information in Table 3 / Table 4 may not be stored in memory.

N-user	bits	Nsts [1]	Nsts [2]
2	00000000-00000111	1-8	One
	00001000-00001110	2- 8	2
	00001111-00010100	3-8	3
	00010101-00011001	4- 8	4

When the second example as above is used, the B12-B17 bit of the example of Table 21 may include the example of Table 23 / Table 24. In addition, in Table 21, the B11 bit may be omitted or may be included for explicit signaling use for the User STA.

In a WLAN system, multiple STAs having different capabilities may coexist. For example, the first type STA (eg, an STA supporting the IEEE 802.11ax standard) supports up to 8 spatial streams and up to 4 spatial streams for transmission and reception through the MU-MIMO technique. In addition, the second type STA supports up to 16 spatial streams and up to 8 spatial streams for transmission and reception through the MU-MIMO technique. The specific number of spatial streams supported by each type of STA may be changed. The transmitting STA (for example, the AP) performing communication with various types of STAs supports the EHT standard and may support, for example, up to 16 spatial streams.

The following example proposes, for example, a signaling technique for the first type STA described above. For example, the first type STA may be called with various names. For example, it may be called with various names such as “ca_8_STA”. In addition, the first type STA may transmit capability information related to the spatial stream to the AP through the process of FIG. 3. For example, in the association (association) of FIG. 3, it is possible to transmit its capability information to a transmitting STA (eg, an AP) through various management frames. The transmitting STA (for example, the AP) acquires information about capability information of the first type STA, allocates a spatial stream for the first type STA based on this, and information about the spatial stream for the first type STA Can be transmitted through a SIG-B field in the PPDU (eg, the SIG-B field of FIG. 18).

The first information field and the second information field described through Tables 20 to 24 may be modified as follows. In the example of Table 20 already described, the first information field is, for an STA performing MU-MIMO communication based on up to 8 spatial streams, for example, 8-bit information (for example, 8-bit information such as Table 20) ) To indicate the number of spatial streams. In the following example, the first information field is for a STA performing MU-MIMO communication based on up to four spatial streams (eg, the first type STA described above), for example, the first information field is 6 The number of spatial streams may be indicated through bit information. The following examples can be variously modified.

The transmitting STA (for example, the AP) may use MU-MIMO to transmit a signal (ie, DL MU PPDU) to a plurality of first type STAs (ie, multiple ca_8_STAs) based on a maximum of 16 spatial streams. have. In this case, the number of cases related to the number of spatial streams allocated based on the number of receiving STAs (ie, the number of receiving STAs related to the DL MU PPDU) may be as follows.

That is, when the number of receiving STAs is 2, as shown in the table below, when possible, a total of 10 may be represented.

N_User = 2, total number of entries = 10

N_User = 3, total number of entries = 20

N_User = 4, total number of entries = 35

N_User = 5, total number of entries = 49

N_User = 6, total number of entries = 54

N_User = 7, total number of entries = 50

N_User = 8, total number of entries = 41

N_User = 9, total number of entries = 31

N_User = 10, total number of entries = 23

N_user = 11, total number of entries = 16

N_User = 12, total number of entries = 13

N_User = 13, total number of entries = 7

N_User = 14, total number of entries = 4

N_User = 15, total number of entries = 2

N_User = 16, total number of entries = 1

When transmitting MU-MIMO using 16 spatial streams as described above, the number of user STAs that can be supported is 2 to 16. Also, the number of supported streams may be different depending on the number of user STAs. In the examples of Tables 25 to 39, the number of user STAs (N_Users) is 6 when the number of cases is the largest. In this case, there are 54 stream allocation combinations. Accordingly, when a transmitting STA (for example, an AP) supporting up to 16 spatial streams transmits a DL MU PPDU through the MU-MIMO technique, a spatial stream allocated to each User STA regardless of the total number of user STAs In order to indicate the number, for example, an information bit of 6 bits may be required.

For example, 6-bit information such as Table 40 below may be included in the User field in the User Specific field 830 shown in FIG. 8. For example, the total number of User STAs (N_user) shown in Table 40 may be included in the RU allocation information in the Common field 820 shown in FIG. 8. Specifically, as illustrated in FIG. 9, information related to the total number of User STAs (N_user) may be included in the RU allocation information in the common field 820 through 3-bit information of “y2y1y0”.

The specific values in Table 40 below may be changed. For example, in the table below, in the situation of N_user = 2, the specific value of 8-bit information is set to “00000000-00000011” to indicate the case of Nsts [2] = 1 and Nsts [1] = 1-4 However, the specific value of the 8-bit information can be changed. For example, any four values other than “00000000-00000011” can be used.

The 6-bit information in Table 40 may be called various names, for example, as a first information field.

An example of Table 40 may be called various names such as 6-bit information (field), 6-bit table, 6-bit lookup table, and 6-bit mapping table. In addition, examples of Table 20 may be called various names such as 8-bit information (field), 8-bit table, 8-bit lookup table, and 8-bit mapping table. In addition, examples of Table 3/4 may be called various names such as 4-bit information (field), 4-bit table, 4-bit lookup table, and 4-bit mapping table.

Using the example of Table 40, a transmitting STA (eg, AP) can transmit a PPDU (eg, DL MU PPDU) using up to 16 spatial streams and MU-MIMO techniques. For example, the transmitted PPDU may be the PPDU shown in FIG. 4/18 or the like. In this case, 2 to 16 receiving STAs (eg, User STAs) allocated based on the MU-MIMO technique may be assigned various combinations of spatial streams as shown in Table 40. Examples of Tables 3, 4, 20, 40, etc. may be included in a user-specific control field. For example, N bit information (for example, 4/6/8 bit information) of Tables 3, 4, 20, and 40 is a signal field of a PPDU (for example, HE / EHT-SIG-B, FIG. 18) SIG-B), for example, may be included in a user-specific control field of a corresponding signal field. In addition, N_User information such as Tables 3, 4, 20, and 40 (that is, information related to the total number of receiving STAs related to the MU-MIMO technique) is a signal field of a PPDU (eg, HE / EHT-SIG-A) , HE / EHT-SIG-B, or SIG-A / B in FIG. 18), for example, may be included in a user-joint control field of a corresponding signal field. For example, N_User information may be included in the RU allocation information shown in Table 1 / Table 2, and specifically, may be included in a common control field of HE / EHT-SIG-B (or SIG-B in FIG. 18).

For example, the example of Table 40 may be used for a first type STA (for example, a STA supporting up to 4 spatial streams for MU-MIMO, such as “ca_8_STA”), and the example of Table 20 may be It can be used for 2 type STA (for example, STA supporting up to 8 spatial streams for MU-MIMO).

In other words, the spatial stream is allocated based on Table 3/4, the spatial stream is allocated based on Table 20, or the spatial stream is based on Table 40 according to the type of STA determined based on the capability of the receiving STA. Can be assigned.

As described above, the size and / or configuration of a bit table (eg, Table 3, 4, 20, 40, etc.) for indicating the number of spatial streams allocated for MU-MIMO according to the capability of the receiving STA is It may vary. Therefore, in order to convey information (i.e., indication information) about the bit table, the signal field of the PPDU (e.g., HE / EHT-SIG-A field, or the first of the common field of the HE / EHT-SIG-B field The first field / block / location) may include information about the size and / or configuration of the bit table (eg, Tables 3, 4, 20, 40, etc.). For example, information about the size of a bit table (eg, Tables 3, 4, 20, 40, etc.) may be composed of 1 bit or 2 bits. For example, the first value (for example, 00) of information regarding the size of a bit table (for example, Table 3, 4, 20, 40, etc.) is a 4-bit table (for example, Table 3/4) Table), the second value (e.g., 01) can identify a 6-bit table (e.g., table in table 40), and the third value (e.g., 10) An 8-bit table (eg, the table in Table 20) may be identified, and a fourth value (eg, 00) may be reserved.

The above-described embodiment can be variously modified.

For example, without using the example of Table 20 / Table 40 to support an increased number of receiving STAs (e.g. up to 16) and / or an increased number of spatial streams (e.g. up to 16) , Examples of Table 3 / Table 4 can be used. That is, an example of utilizing the 4-bit table of Table 3 / Table 4 used in the IEEE 802.11ax standard is possible. For example, as shown in the example of Table 20, 8-bit information may be required for MU-MIMO communication through up to 16 spatial streams. In this case, an example of using two 4-bit tables such as the example of Table 3 / Table 4 is possible without constructing a new 8-bit table such as the example of Table 20.

For example, the transmitting STA (eg, AP) may signal 8-bit information to indicate the number of spatial streams allocated for the MU-MIMO technique to a plurality of receiving STAs (eg, User STA). have. The 8-bit information may be configured based on two 4-bit tables. In this case, the 4-bit table may be configured the same or different from Table 3 / Table 4. For example, the example of Table 3 / Table 4 can be used to allocate a total of 8 spatial streams, specifically, it can be used for up to 8 receiving STAs, and up to 4 spatial streams for one receiving STA. Can be used to allocate. Accordingly, when the 4-bit table shown in Table 3 / Table 4 is used twice, the transmitting STA (for example, the AP) can support up to 16 spatial streams. Specifically, the transmitting STA supports up to 16 spatial streams, and also supports up to 16 receiving STAs, and can allocate up to 4 spatial streams for one receiving STA.

For example, if a 4-bit table is used twice, 1 to 8 spatial streams may be allocated through the first 4-bit table, and 1 to 8 spatial streams may be allocated again through the second 4-bit table. You can.

First 4 bit table		Second 4 bit table
1 ~ 8 stream	1 ~ 8 stream

For example, if the transmitting STA transmitting the DL MU PPDU uses 13 spatial streams for the MU-MIMO technique, information related to the first 7 spatial streams may be allocated / directed through the first 4 bit table. , Information related to the remaining six spatial streams can be allocated / directed through the second 4-bit table. In this case, N_user information for the first 4 bit table (that is, information about the total number of receiving STAs allocated to the first bit table) and N_user information for the second 4 bit table (that is, allocated to the first bit table) Information on the total number of received STAs) may be included in the signal field of the PPDU (eg, HE / EHT-SIG-A, HE / EHT-SIG-B, or SIG-A / B in FIG. 18). . For example, content included in the HE / EHT-SIG-A, HE / EHT-SIG-B, or SIG-A / B field of FIG. 18 may be as follows. That is, N_user information for each 4-bit table may be composed of 3-bit information, but the bit length may be changed.

Number of MU-MIMO user for table 1: 3bit

Number of MU-MIMO user for table 2: 3bit

In addition, the transmitting STA uses a 1-bit (eg, table indication bit) that identifies which of the two 4-bit tables is used (eg, HE / EHT-SIG-A, HE / EHT-SIG-B, or SIG-A / B field in FIG. 18). One bit (for example, a table indication bit) may be included in the User field of a user-specific field of the SIG-B field, for example. For example, a first value (eg, “0”) of 1 bit (eg, table indication bit) may be used to identify the first 4 bit table, and a second value (eg, “1”) can be used to identify the second 4-bit table.

For example, it is also possible to configure the two 4-bit tables described above into one 8-bit table. In this case, the first value (eg, “0”) of 1 bit (eg, table indication bit) indicates that a 4-bit of MSB is used in an 8-bit table including 2 4-bit tables. can do. In addition, the second value (eg, “1”) of 1 bit (eg, table indication bit) indicates that a 4-bit of LSB is used in an 8-bit table including 2 4-bit tables. You can.

In the above example, two 4-bit tables are used, but it is also possible to transmit information on spatial streams for MU-MIMO transmission and reception using only one 4-bit table.

For example, if a transmitting STA supporting up to 16 spatial streams (for example, an AP) transmits a DL MU PPDU based on the MU-MIMO technique, a plurality of receiving STAs allocated through the MU-MIMO technique (eg For example, in order to signal information on the number of spatial streams of the user STA), a table (ie, a 4-bit table) of the IEEE 802.11ax standard shown in Table 3/4 can be used. That is, an example of Table 3/4 may be used to inform the STA of allocated spatial stream information. The transmitting STA may transmit information on the number of MU-MIMO users (ie, N_User information) through a signal field (eg, a common field or user field of HE / EHT-SIG-A, EHT-SIG-B). have. The receiving STA may receive MU-MIMO users through a signal field (eg, HE / EHT-SIG-A, HE / EHT-SIG-B, common field or user field of SIG-A / B in FIG. 18) (that is, , N_User information), and obtain / confirm the number of spatial streams allocated to the user through 4-bit information in the user field of the SIG-B field. In this case, the complexity of the design may be reduced because a 4-bit table that has been designed can be used.

19 is a first procedure flow chart according to an example of the present specification.

Since all the procedures shown in FIG. 19 are not essential, some (eg, S1910) steps may be omitted.

The example of FIG. 19 may be performed by the receiving STA. The receiving STA may be a User STA.

In step S1910, the receiving STA may transmit and receive capability information related to the spatial stream. For example, the receiving STA may generate capability information regarding the number of spatial streams it supports and transmit it to the transmitting STA. For example, the capability of the receiving STA may be determined differently depending on the type, for example, the maximum number of spatial streams that can be received through the MU-MIMO technique may be 8 or 4. For example, the maximum number of spatial streams that can be received based on the SU technique rather than the MU-MIMO technique may be 16 or 8.

In addition, capability information regarding whether the transmitting STA supports up to 16 spatial streams may be received. Step S1910 may be performed through various frames such as beacon, Probe Request, Probe Response, Association Request, Association Response and / or management frame.

Through step S1910, capability information of the transmitting / receiving STA is transmitted / received, and the transmitting STA (for example, the AP) whether the receiving STA receives the PPDU through the MU-MIMO technique, the number of spatial streams that can be allocated for the receiving STA It is possible to obtain / determine information on, for example.

In step S1920, the receiving STA may receive a signal (eg, EHT PPDU) including a user-specific control field for multi-user (MU) communication. The signal of step S1920 (eg, EHT PPDU) can be received through a maximum of 16 spatial streams. The signal of step S1920 may be configured based on, for example, the example of FIG. 4 or FIG. 18. Through step S1920, the receiving STA may receive the PPDU including the EHT-SIG field. Through this, the receiving STA can obtain control information / control bits / control sequences including space setting information of Table 20, Table 21, Table 40, and the like.

For example, when the receiving STA receives a PPDU (eg, DL MU PPDU) through the MU-MIMO technique, a user-specific control field is received through step S1920, and for the receiving STA Information about the number of spatial streams allocated can be obtained.

The user-specific control field in step S1920 includes a first information field on the number of spatial streams for the receiving STA, and information on the size of the first information field. It may include a second information field. The second information field may be omitted. The first information field is composed of 4 bit information, 6 bit information, and 8 bit information, and the second information field may further include information on the length of the first information field. For example, the first information field may include 4/6/8 bit information shown in Table 3/4, Table 20, and / or Table 40.

Although not illustrated in step S1920, additional control information may include a signal field (eg, HE / EHT-SIG-A field, HE / EHT-SIG-B common field, SIG-A field of FIG. 18, or FIG. 18) SIG-B common field, etc.). For example, when two 4-bit tables are used as described above, N_User information applied to each bit table may be included in the HE / EHT-SIG-A field or the common field of HE / EHT-SIG-B. . In addition, various bit information described in the examples of Tables 20 to 24 and / or Tables 40 to 41 are signal fields (eg, HE / EHT-SIG-A field, HE / EHT-SIG-B common field) , SIG-A field of FIG. 18, or SIG-B common field of FIG. 18).

In step S1930, the receiving STA may decode the data field of the received signal (ie, PPDU) based on the information obtained through step S1920. That is, the receiving STA obtains information related to the spatial stream for the receiving STA through step S1920, and can decode the PPDU based on the information, and finally decodes the data field in the PPDU.

20 is a flowchart of a second procedure according to an example of the present specification.

Since not all procedures shown in FIG. 20 are essential, some (eg, S2010) steps may be omitted.

The example of FIG. 20 may be performed by the transmitting STA. The transmitting STA may be an AP STA.

In step S2010, the transmitting STA may transmit and receive capability information related to the spatial stream. For example, the transmitting STA may generate capability information regarding whether to support a maximum of 16 spatial streams and transmit it to the receiving STA. In addition, capability information of the receiving STA may be received. Step S1510 may be performed through various frames such as beacon, Probe Request, Probe Response, Association Request, Association Response and / or management frame.

The capability information of the transmitting / receiving STA is transmitted / received through the step S2010, and the transmitting STA (for example, the AP) receives whether the receiving STA receives the PPDU through the MU-MIMO technique or the number of spatial streams that can be allocated for the receiving STA. It is possible to obtain / determine information on, for example.

In step S2020, the transmitting STA may generate a signal including a user-specific control field for multi-user (MU) communication. The signal of step S2020 can be transmitted through a maximum of 16 spatial streams. The signal of step S2020 may include an EHT PPDU. The signal of step S2020 may be configured based on, for example, the example of FIG. 4 or FIG. 18.

The user-specific control field in step S2020 includes a first information field on the number of spatial streams for the receiving STA, and information on the size of the first information field. It may include a second information field. The second information field may be omitted. The first information field is composed of 4 bit information, 6 bit information, and 8 bit information, and the second information field may further include information on the length of the first information field. For example, the first information field may include 4/6/8 bit information shown in Table 3/4, Table 20, and / or Table 40.

Although not illustrated in step S2020, additional control information may include a signal field (eg, HE / EHT-SIG-A field, common field of HE / EHT-SIG-B, SIG-A field of FIG. 18, or FIG. 18) SIG-B common field, etc.). For example, when two 4-bit tables are used as described above, N_User information applied to each bit table is an HE / EHT-SIG-A field, a common field of HE / EHT-SIG-B, and FIG. 18. It may be included in the SIG-A field, or the SIG-B common field of FIG. 18. In addition, various bit information described in the examples of Tables 20 to 24 and / or Tables 40 to 41 are signal fields (eg, HE / EHT-SIG-A field, HE / EHT-SIG-B common field) , SIG-A field of FIG. 18, or SIG-B common field of FIG. 18).

Through step S2030, the transmitting STA may transmit the PPDU including the EHT-SIG field. Through this, the transmitting STA may transmit control information / control bits / control sequences including spatial setting information such as Table 20 / Table 21 / Table 40.

The technical features of the present specification described above can be applied to various application examples or business models. For example, the above-described technical features may be applied for wireless communication in a device supporting Artificial Intelligence (AI).

Artificial intelligence refers to the field of studying artificial intelligence or a methodology to create it, and machine learning (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 steady experience.

An artificial neural network (ANN) is a model used in machine learning, and may refer to an overall model having a problem-solving ability, which is composed of artificial neurons (nodes) forming a network through synaptic coupling. The artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process for updating model parameters, and an activation function 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. In addition, the hyperparameter means a parameter that must be set before learning in a machine learning algorithm, and includes learning rate, number of iterations, mini-batch size, initialization function, and the like.

The purpose of training 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 for determining 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. Can mean 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 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 part of machine learning. In the following, machine learning is used to mean deep learning.

In addition, the above-described technical features can be applied to the wireless communication of the robot.

A robot can mean a machine that automatically handles or acts on a task given by its own capabilities. In particular, a robot having a function of recognizing the environment and performing an operation by determining itself can be referred to as an intelligent robot.

Robots can be classified into industrial, medical, household, and military 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. In addition, 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.

In addition, the above-described technical features can be applied to a device that supports augmented reality.

Augmented reality refers to virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology provides real-world objects or backgrounds only as CG images, AR technology provides CG images made virtually on real objects, and MR technology is a computer that mixes and combines virtual objects in the real world. Graphics technology.

MR technology is similar to AR technology in that it shows both real and virtual objects. However, in AR technology, 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.

XR technology can be applied to Head-Mount Display (HMD), Head-Up Display (HUD), mobile phone, tablet PC, laptop, desktop, TV, digital signage, etc. It can be called.

The claims described herein can be combined in various ways. For example, the technical features of the method claims of the present specification may be combined and implemented as a device, and the technical features of the device claims of the specification may be combined and implemented as a method. Further, the technical features of the method claims of the present specification and the technical features of the device claims may be combined and implemented as a device, and the technical features of the method claims of the specification and the device claims of the present specification may be combined and implemented as a method.

Claims (14)

1. A method for receiving a signal in a wireless local area network (WLAN) system,

   A user station (user STA) receives a physical layer protocol data unit (PPDU) including a user-specific control field for multi-user (MU) communication,

   The user-specific control field includes first information fields related to the number of spatial streams for the user STA and information about the size of the first information fields. It includes a second information field including,

   Wherein the second information field includes information on whether the first information field is 6-bit information; And

   Decoding, by the user station, a data field of the PPDU based on the user-specific control field.

   How to include.
2. According to claim 1,

   The first information field is 4-bit information, 6-bit information, or 8-bit information,

   The second information field further includes information about the length of the first information field.

   Way.
3. According to claim 1,

   The user-individual control field further includes identification information of the user station, modulation and coding scheme (MSC) information applied to the data field, and information about a coding type applied to the data field.

   Way.
4. According to claim 1,

   The user station (user STA) supports up to 8 spatial streams, and the wireless LAN system supports up to 16 spatial streams.

   Way.
5. According to claim 1,

   The PPDU is received through MU-MIMO (multi-user multiple input, multiple output) technique

   Way.
6. According to claim 1,

   The PPDU further includes a user-common control field,

   The user-common control field further includes resource (RU) allocation information applied to the PPDU.

   Way.
7. According to claim 1,

   The PPDU is an extreme high throughput (EHT) PPDU.

   Way.
8. In a user station (user STA) of a wireless local area network (WLAN) system,

   A transceiver for receiving radio signals and

   It includes a processor for controlling the transceiver,

   The processor

   Through the transceiver, a physical layer protocol data unit (PPDU) including a user-specific control field for multi-user (MU) communication is received,

   The user-specific control field includes first information fields related to the number of spatial streams for the user STA and information about the size of the first information fields. It includes a second information field including, wherein the second information field includes information about whether the first information field is 6-bit information,

   Set to decode the data field of the PPDU based on the user-individual control field

   Device.
9. The method of claim 8,

   The first information field is 4-bit information, 6-bit information, or 8-bit information,

   The second information field further includes information about the length of the first information field.

   Device.
10. The method of claim 8,

    The user-individual control field further includes identification information of the user station, modulation and coding scheme (MSC) information applied to the data field, and information about a coding type applied to the data field.

    Device.
11. The method of claim 8,

    The user station (user STA) supports up to 8 spatial streams, and the wireless LAN system supports up to 16 spatial streams.

    Device.
12. The method of claim 8,

    The PPDU is received through MU-MIMO (multi-user multiple input, multiple output) technique

    Device.
13. The method of claim 8,

    The PPDU further includes a user-common control field,

    The user-common control field further includes resource (RU) allocation information applied to the PPDU.

    Device.
14. The method of claim 8,

    The PPDU is an extreme high throughput (EHT) PPDU.

    Device.

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