WO2021187844A1 - 무선 통신 시스템에서 데이터를 송수신하기 위한 방법 및 무선 통신 단말 - Google Patents

무선 통신 시스템에서 데이터를 송수신하기 위한 방법 및 무선 통신 단말 Download PDF

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Publication number
WO2021187844A1
WO2021187844A1 PCT/KR2021/003186 KR2021003186W WO2021187844A1 WO 2021187844 A1 WO2021187844 A1 WO 2021187844A1 KR 2021003186 W KR2021003186 W KR 2021003186W WO 2021187844 A1 WO2021187844 A1 WO 2021187844A1
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Prior art keywords
ppdu
spatial reuse
trigger frame
field
fields
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PCT/KR2021/003186
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English (en)
French (fr)
Korean (ko)
Inventor
김상현
손주형
고건중
곽진삼
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Wilus Institute of Standards and Technology Inc
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Wilus Institute of Standards and Technology Inc
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Application filed by Wilus Institute of Standards and Technology Inc filed Critical Wilus Institute of Standards and Technology Inc
Priority to CN202180021148.1A priority Critical patent/CN115336217B/zh
Priority to KR1020227032674A priority patent/KR20220154699A/ko
Priority to US17/911,635 priority patent/US20230130569A1/en
Priority to CN202411971212.4A priority patent/CN119921923A/zh
Priority to CN202411971111.7A priority patent/CN119892316A/zh
Priority to CN202411971924.6A priority patent/CN119892317A/zh
Priority to JP2022555730A priority patent/JP7651194B2/ja
Publication of WO2021187844A1 publication Critical patent/WO2021187844A1/ko
Anticipated expiration legal-status Critical
Priority to JP2025035744A priority patent/JP2025087845A/ja
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to a wireless communication system, and more particularly, the present invention relates to a trigger frame for instructing transmission of a TB (Trigger Based) Physical Layer Protocol Data Unit (PPDU) in a wireless communication system and a TB PPDU based on the trigger frame. and a method and apparatus for transmitting and receiving.
  • a trigger frame for instructing transmission of a TB (Trigger Based) Physical Layer Protocol Data Unit (PPDU) in a wireless communication system and a TB PPDU based on the trigger frame.
  • PPDU Physical Layer Protocol Data Unit
  • Wireless LAN technology is a technology that enables mobile devices such as smart phones, smart pads, laptop computers, portable multimedia players, embedded devices, etc. am.
  • IEEE 802.11b supports a communication speed of up to 11Mbps while using a frequency of the 2.4GHz band.
  • IEEE 802.11a commercialized after IEEE 802.11b, uses a frequency of 5 GHz band instead of 2.4 GHz band, thereby reducing the effect of interference compared to the fairly crowded 2.4 GHz band, and using OFDM technology to maximize communication speed Up to 54 Mbps.
  • IEEE 802.11a has a disadvantage in that the communication distance is shorter than that of IEEE 802.11b.
  • IEEE 802.11g like IEEE 802.11b, uses a frequency of the 2.4GHz band to achieve a communication speed of up to 54Mbps and has received considerable attention as it satisfies backward compatibility. have the upper hand
  • IEEE 802.11n is a technical standard established to overcome the limit on communication speed, which has been pointed out as a weakness in wireless LAN. IEEE 802.11n aims to increase the speed and reliability of the network and extend the operating distance of the wireless network. More specifically, IEEE 802.11n supports high throughput (HT) with a data processing rate of up to 540 Mbps or higher, and uses multiple antennas at both ends of the transmitter and receiver to minimize transmission errors and optimize data rates. It is based on MIMO (Multiple Inputs and Multiple Outputs) technology. In addition, this standard may use a coding method that transmits multiple duplicate copies to increase data reliability.
  • HT high throughput
  • MIMO Multiple Inputs and Multiple Outputs
  • IEEE 802.11ac supports a wide bandwidth (80 MHz to 160 MHz) at a frequency of 5 GHz.
  • the IEEE 802.11ac standard is defined only in the 5GHz band, but for backward compatibility with the existing 2.4GHz band products, the initial 11ac chipsets will also support operation in the 2.4GHz band.
  • the wireless LAN speed of multiple stations is at least 1 Gbps, and the maximum single link speed is at least 500 Mbps.
  • IEEE 802.11ad is a transmission standard that provides a speed of up to 7 Gbps using beamforming technology, and is suitable for streaming large amounts of data or high bit rate video such as uncompressed HD video.
  • the 60 GHz frequency band has a disadvantage in that it is difficult to pass through obstacles and can only be used between devices in a short distance.
  • the IEEE 802.11ax High Efficiency WLAN, HEW
  • HEW High Efficiency WLAN
  • high-frequency-efficiency communication must be provided indoors and outdoors in the presence of high-density stations and access points (APs), and various technologies have been developed to implement it.
  • IEEE 802.11be Extremely High Throughput, EHT
  • EHT Extremely High Throughput
  • an object of the present invention is to provide a high-speed wireless LAN service for a new multimedia application.
  • Another object of the present invention is to provide a method and apparatus for configuring a trigger frame for instructing transmission of a TB PPDU, which is a PPDU based on a trigger frame, according to a type.
  • the present invention aims to provide a method and apparatus for generating a High Efficiency (HE) PPDU or Extremely High Throughput (EHT) PPDU according to different information included in a trigger frame transmitted from an Access Point (AP). .
  • HE High Efficiency
  • EHT Extremely High Throughput
  • a terminal for transmitting a TB PPDU (Trigger Based Physical Layer Protocol Data Unit) that is a response frame based on a trigger frame in a wireless communication system includes: a communication module; a processor for controlling the communication module, wherein the processor receives a trigger frame from an access point (AP), wherein the trigger frame includes a common information field including a first plurality of spatial reuse fields and whether an additional information field including a plurality of second spatial reuse fields is included is identified based on the identification information of the trigger frame, and in response to the trigger frame, the first plurality of spatial reuse fields or the second Transmitting a response frame generated based on information obtained from a plurality of spatial reuse fields, whether the response frame is generated based on the first plurality of spatial reuse fields or to the second plurality of spatial reuse fields Whether generated based on the trigger frame is determined based on a format associated with the trigger frame.
  • AP access point
  • the response frame is generated based on information obtained from the plurality of second spatial reuse fields.
  • the response frame is generated based on information obtained from the first plurality of spatial reuse fields.
  • HE high efficiency
  • whether the response frame is generated based on information obtained from the first plurality of spatial reuse fields or generated based on information obtained from the second plurality of spatial reuse fields is It is determined based on the position on the frequency axis of the resource unit to which the response frame is transmitted.
  • the trigger frame further includes a bandwidth field, an additional bandwidth field, and a resource allocation field indicating a resource unit to which the response frame is transmitted.
  • the processor recognizes the resource unit to which the response frame is transmitted based on the resource allocation field, and the first plurality of the resource units according to the location on the frequency axis of the resource unit to which the response frame is transmitted.
  • a response frame is generated based on the spatial reuse fields or information obtained from the second plurality of spatial reuse fields.
  • the trigger frame further includes a puncturing mode field indicating whether or not puncturing in the bandwidth indicated by the bandwidth field and/or the additional bandwidth field and the location of the puncture.
  • the response frame when the response frame is generated based on the plurality of second spatial reuse fields, the response frame includes a bandwidth field included in the common information field and an additional bandwidth field included in the additional information field. It is transmitted through the bandwidth indicated by
  • the response frame includes a plurality of spatial reuse fields, and each of the plurality of spatial reuse fields corresponds to the first plurality of spatial reuse fields or the second plurality of spatial reuse fields, respectively. It is set based on information obtained from
  • whether the trigger frame includes the additional information field is determined by a value of a specific subfield indicating whether the additional information field is included in the common information field and/or an identifier of the additional information field. It is recognized depending on whether the value of is set to a specific value.
  • the response frame is a TB PPDU (Trigger based Physical layer Protocol Data Unit), and the TB PPDU is at least one transmitted from at least one other terminal that is instructed to transmit the TB PPDU by the trigger frame. It is aggregated with a TB PPDU and transmitted in the form of an aggregated (A)-PPDU, wherein the at least one TB PPDU is generated based on the first plurality of spatial reuse fields or the second plurality of spatial reuse fields, , the TB PPDU and the at least one TB PPDU are generated based on different spatial reuse fields.
  • A aggregated
  • the present invention includes the steps of receiving a trigger frame (trigger frame) from an AP (Access Point), the trigger frame includes a common information field including a first plurality of spatial reuse fields and based on the identification information of the trigger frame to identify whether the additional information field including the second plurality of spatial reuse fields is included; and transmitting a response frame generated based on information obtained from the first plurality of spatial reuse fields or the second plurality of spatial reuse fields in response to the trigger frame, wherein the response frame is Whether generated based on the first plurality of spatial reuse fields or based on the second plurality of spatial reuse fields is determined based on a format related to the trigger frame.
  • a trigger frame trigger frame
  • AP Access Point
  • the resolution of spatial reuse indicated in the TB PPDU is increased.
  • the spatial reuse efficiency of the OBSS (Overlapping Basic Service Set) increases.
  • the trigger frame is transmitted through a discontinuous channel, it is possible to allow transmission of a TB PPDU to a plurality of STAs.
  • FIG. 1 shows a wireless LAN system according to an embodiment of the present invention.
  • FIG. 2 shows a wireless LAN system according to another embodiment of the present invention.
  • FIG 3 shows the configuration of a station according to an embodiment of the present invention.
  • FIG 4 shows the configuration of an access point according to an embodiment of the present invention.
  • FIG. 5 schematically illustrates a process in which a station establishes a link with an access point.
  • FIG. 6 illustrates an example of a carrier sense multiple access (CSMA)/collision avoidance (CA) method used in wireless LAN communication.
  • CSMA carrier sense multiple access
  • CA collision avoidance
  • EHT Extremely High Throughput
  • FIG. 8 shows a U-SIG field of a TB PPDU according to an embodiment of the present invention.
  • FIG 9 shows an example of a trigger format according to an embodiment of the present invention.
  • FIG. 10 shows an example of the configuration of a common information field of a trigger frame according to an embodiment of the present invention.
  • FIG. 11 shows an example of the configuration of an additional information field according to the format of a trigger frame according to an embodiment of the present invention.
  • FIG. 12 shows an example of a spatial reuse field and a puncturing mode field for uplink transmission according to an embodiment of the present invention.
  • FIG. 13 shows an example of transmission of a trigger frame and a trigger frame-based TB PPDU according to an embodiment of the present invention.
  • FIG. 14A and 14B show another example of transmission of a trigger frame and a trigger frame-based TB PPDU according to an embodiment of the present invention.
  • 15 is a flowchart illustrating an example of a method for selecting a space reuse field for generating a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • FIG. 16 illustrates an example of a spatial reuse operation according to the number of spatial reuse fields for a frequency band according to an embodiment of the present invention.
  • FIG 17 shows an example of a method for transmitting a trigger frame according to an embodiment of the present invention.
  • FIG. 18 shows an example of a TB PPDU including a puncturing mode according to an embodiment of the present invention.
  • FIG. 19 shows an example of a procedure for allocating a resource unit and responding to a TB PPDU through a trigger frame according to an embodiment of the present invention.
  • FIG. 20 shows an example of a method of receiving a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • 21 shows another example of a method of receiving a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • FIG. 22 shows another example of a method for receiving a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • FIG. 23 shows another example of a method of receiving a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • FIG. 24 shows an example of a user information field of a trigger frame according to an embodiment of the present invention.
  • 25 shows an example of a method of transmitting a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • 26 shows an example of a format of a U-SIG field of a TB PPDU according to an embodiment of the present invention.
  • FIG. 27 shows an example of a configuration and signaling of a resource unit for transmission of a TB PPDU according to an embodiment of the present invention.
  • FIG. 28 shows an example of signaling of a puncturing mode and a segment position through a TB PPDU according to an embodiment of the present invention.
  • 29 shows an example of setting and using a subchannel for TB PPDH transmission according to an embodiment of the present invention.
  • FIG. 30 illustrates an example of signal detection for a TB PPDU in response to a trigger frame according to an embodiment of the present invention.
  • 31 shows an example of applying a different threshold value to a region where reception is expected in a signal detection process for a TB PPDU according to an embodiment of the present invention.
  • 32 illustrates an example of an error correction method for signal detection according to an embodiment of the present invention.
  • FIG 33 is a flowchart illustrating an example of a method for a non-AP STA to transmit a response frame to a trigger frame according to an embodiment of the present invention.
  • 34 is a flowchart illustrating an example of a method for an AP STA to receive a response frame to a trigger frame according to an embodiment of the present invention.
  • FIG. 1 shows a wireless LAN system according to an embodiment of the present invention.
  • the WLAN system includes one or more basic service sets (BSS), which indicate a set of devices that can communicate with each other by successfully synchronizing.
  • BSS basic service sets
  • the BSS may be divided into an infrastructure BSS (infrastructure BSS) and an independent BSS (IBSS), and FIG. 1 shows the infrastructure BSS among them.
  • infrastructure BSS infrastructure BSS
  • IBSS independent BSS
  • the infrastructure BSS (BSS1, BSS2) includes one or more stations (STA1, STA2, STA3, STA4, STA5), an access point (AP-1), which is a station providing a distribution service. , AP-2), and a distribution system (DS) for connecting a plurality of access points (AP-1, AP-2).
  • BSS1, BSS2 includes one or more stations (STA1, STA2, STA3, STA4, STA5), an access point (AP-1), which is a station providing a distribution service. , AP-2), and a distribution system (DS) for connecting a plurality of access points (AP-1, AP-2).
  • a station is an arbitrary device including a medium access control (MAC) and a physical layer interface for a wireless medium that comply with the provisions of the IEEE 802.11 standard, and in a broad sense, a non-access point ( It includes both non-AP stations as well as access points (APs). Also, in this specification, the term 'terminal' may be used to refer to a non-AP STA, an AP, or both.
  • the station for wireless communication includes a processor and a communication unit, and may further include a user interface unit and a display unit according to an embodiment.
  • the processor may generate a frame to be transmitted through the wireless network or process a frame received through the wireless network, and may perform various other processes for controlling the station.
  • the communication unit is functionally connected to the processor and transmits and receives frames through a wireless network for the station.
  • a terminal may be used as a term including a user equipment (UE).
  • An access point is an entity that provides access to a distribution system (DS) via a wireless medium for a station associated with it.
  • DS distribution system
  • the AP is used as a concept including a PCP (Personal BSS Coordination Point), and broadly, a centralized controller, a base station (BS), a Node-B, a BTS (Base Transceiver System), or a site. It may include all concepts such as a controller.
  • the AP may also be referred to as a base wireless communication terminal
  • the base wireless communication terminal is a term including all of an AP, a base station, an eNB (eNodeB), and a transmission point (TP) in a broad sense.
  • the base wireless communication terminal may include various types of wireless communication terminals for allocating communication medium resources and performing scheduling in communication with a plurality of wireless communication terminals.
  • a plurality of infrastructure BSSs may be interconnected through a distribution system (DS).
  • DS distribution system
  • ESS extended service set
  • FIG. 2 illustrates an independent BSS as a wireless LAN system according to another embodiment of the present invention.
  • the same or corresponding parts to the embodiment of Fig. 1 will be omitted redundant description.
  • BSS3 shown in FIG. 2 is an independent BSS and does not include an AP, all stations STA6 and STA7 are not connected to the AP.
  • the independent BSS is not allowed to access the distribution system and forms a self-contained network.
  • each of the stations STA6 and STA7 may be directly connected to each other.
  • the station 100 may include a processor 110 , a communication unit 120 , a user interface unit 140 , a display unit 150 , and a memory 160 .
  • the communication unit 120 transmits and receives wireless signals such as wireless LAN packets, and may be built-in to the station 100 or provided externally.
  • the communication unit 120 may include at least one communication module using different frequency bands.
  • the communication unit 120 may include communication modules of different frequency bands such as 2.4 GHz, 5 GHz, 6 GHz, and 60 GHz.
  • the station 100 may include a communication module using a frequency band of 7.125 GHz or higher and a communication module using a frequency band of 7.125 GHz or lower.
  • Each communication module may perform wireless communication with an AP or an external station according to a wireless LAN standard of a frequency band supported by the corresponding communication module.
  • the communication unit 120 may operate only one communication module at a time or operate a plurality of communication modules together at the same time according to the performance and requirements of the station 100 .
  • each communication module may be provided in an independent form, or a plurality of modules may be integrated into one chip.
  • the communication unit 120 may represent an RF communication module that processes a radio frequency (RF) signal.
  • RF radio frequency
  • the user interface unit 140 includes various types of input/output means provided in the station 100 . That is, the user interface unit 140 may receive a user input using various input means, and the processor 110 may control the station 100 based on the received user input. Also, the user interface unit 140 may perform an output based on a command of the processor 110 using various output means.
  • the display unit 150 outputs an image on the display screen.
  • the display unit 150 may output various display objects such as content executed by the processor 110 or a user interface based on a control command of the processor 110 .
  • the memory 160 stores a control program used in the station 100 and various data corresponding thereto.
  • a control program may include an access program necessary for the station 100 to access an AP or an external station.
  • the processor 110 of the present invention may execute various commands or programs and process data inside the station 100 .
  • the processor 110 may control each unit of the above-described station 100 , and may control data transmission/reception between the units.
  • the processor 110 may execute a program for accessing the AP stored in the memory 160 and receive a communication setting message transmitted by the AP.
  • the processor 110 may read information on the priority condition of the station 100 included in the communication setup message, and request access to the AP based on the information on the priority condition of the station 100 .
  • the processor 110 of the present invention may refer to the main control unit of the station 100, and may refer to a control unit for individually controlling some components of the station 100, such as the communication unit 120, according to an embodiment.
  • the processor 110 may be a modem or a modulator and/or demodulator that modulates and demodulates a radio signal transmitted and received from the communication unit 120 .
  • the processor 110 controls various operations of wireless signal transmission and reception of the station 100 according to an embodiment of the present invention. Specific examples thereof will be described later.
  • the station 100 shown in FIG. 3 is a block diagram according to an embodiment of the present invention. Separately indicated blocks are logically separated and illustrated for device elements. Accordingly, the elements of the above-described device may be mounted as one chip or a plurality of chips according to the design of the device. For example, the processor 110 and the communication unit 120 may be integrated into one chip or implemented as a separate chip. In addition, in the embodiment of the present invention, some components of the station 100 , such as the user interface unit 140 and the display unit 150 , may be selectively provided in the station 100 .
  • the AP 200 may include a processor 210 , a communication unit 220 , and a memory 260 .
  • the AP 200 in FIG. 4 redundant descriptions of parts identical to or corresponding to those of the station 100 of FIG. 3 will be omitted.
  • the AP 200 includes a communication unit 220 for operating the BSS in at least one frequency band.
  • the communication unit 220 of the AP 200 may also include a plurality of communication modules using different frequency bands. That is, the AP 200 according to an embodiment of the present invention may include two or more communication modules in different frequency bands, for example, 2.4 GHz, 5 GHz, 6 GHz, and 60 GHz.
  • the AP 200 may include a communication module using a frequency band of 7.125 GHz or higher and a communication module using a frequency band of 7.125 GHz or lower.
  • Each communication module may perform wireless communication with a station according to a wireless LAN standard of a frequency band supported by the corresponding communication module.
  • the communication unit 220 may operate only one communication module at a time or a plurality of communication modules simultaneously according to the performance and requirements of the AP 200 .
  • the communication unit 220 may represent an RF communication module that processes a radio frequency (RF) signal.
  • RF radio frequency
  • the memory 260 stores a control program used in the AP 200 and various data corresponding thereto.
  • a control program may include an access program for managing access of stations.
  • the processor 210 may control each unit of the AP 200 , and may control data transmission/reception between the units.
  • the processor 210 may execute a program for connection with a station stored in the memory 260 and transmit a communication setting message for one or more stations.
  • the communication setting message may include information on the access priority condition of each station.
  • the processor 210 performs connection establishment according to the connection request of the station.
  • the processor 210 may be a modem or a modulator and/or demodulator that modulates and demodulates a radio signal transmitted and received from the communication unit 220 .
  • the processor 210 controls various operations of wireless signal transmission and reception of the AP 200 according to an embodiment of the present invention. Specific examples thereof will be described later.
  • FIG. 5 schematically illustrates a process in which a station establishes a link with an access point.
  • the scanning step is a step in which the STA 100 acquires access information of the BSS operated by the AP 200 .
  • a passive scanning method in which information is obtained by using only a beacon message S101 periodically transmitted by the AP 200, and a probe request by the STA 100 to the AP
  • an active scanning method for transmitting a probe request (S103) and receiving a probe response from the AP (S105) to obtain access information.
  • the STA 100 successfully receiving the radio access information in the scanning step transmits an authentication request (S107a), receives an authentication response from the AP 200 (S107b), and performs the authentication step do. After the authentication step is performed, the STA 100 transmits an association request (S109a) and receives an association response from the AP 200 (S109b) to perform the association step.
  • association basically means wireless coupling, but the present invention is not limited thereto, and coupling in a broad sense may include both wireless coupling and wired coupling.
  • the authentication server 300 is a server that processes 802.1X-based authentication with the STA 100 , and may exist physically coupled to the AP 200 or exist as a separate server.
  • FIG. 6 illustrates an example of a carrier sense multiple access (CSMA)/collision avoidance (CA) method used in wireless LAN communication.
  • CSMA carrier sense multiple access
  • CA collision avoidance
  • a terminal performing wireless LAN communication checks whether a channel is busy by performing carrier sensing before transmitting data. If a radio signal of a predetermined strength or higher is detected, it is determined that the corresponding channel is busy, and the terminal delays access to the corresponding channel. This process is called clear channel assessment (CCA), and the level at which a corresponding signal is detected is called a CCA threshold. If a radio signal greater than the CCA threshold value received by the terminal has the corresponding terminal as a receiver, the terminal processes the received radio signal. On the other hand, when no radio signal is detected in the corresponding channel or a radio signal having an intensity smaller than the CCA threshold is detected, the channel is determined to be in an idle state.
  • CCA clear channel assessment
  • each terminal having data to transmit performs a backoff procedure after a time of Inter Frame Space (IFS), such as AIFS (Arbitration IFS), PIFS (PCF IFS), etc. according to the situation of each terminal. do.
  • IFS Inter Frame Space
  • the AIFS may be used as a configuration to replace the existing DIFS (DCF IFS).
  • DCF IFS DIFS
  • Each terminal waits while decreasing the slot time as much as a random number determined for the corresponding terminal during the interval of the idle state of the channel, and the terminal that has exhausted all the slot time attempts access to the corresponding channel do. In this way, a period in which each terminal performs a backoff procedure is referred to as a contention window period.
  • the corresponding terminal may transmit data through the channel.
  • the collided terminals receive a new random number and perform the backoff procedure again.
  • the random number newly allocated to each terminal may be determined within a range (2*CW) twice the range of random numbers previously allocated to the corresponding terminal (contention window, CW).
  • each terminal attempts to access by performing the backoff procedure again in the next contention window period, and at this time, each terminal performs the backoff procedure from the remaining slot time in the previous contention window period. In this way, each terminal performing wireless LAN communication can avoid collision with each other for a specific channel.
  • a terminal may be referred to as a non-AP STA, an AP STA, an STA, a receiving device, or a transmitting device, but the present invention is not limited thereto.
  • EHT Extremely High Throughput
  • FIG. 7(a) shows an example of a single/multi-user transmission PPDU format
  • (b) shows an example of a TB (trigger based) PPDU format
  • FIG. 7C shows an example of a Hight Efficient (HE) PPDU format in Wi-Fi 802.11ax, which is a previous generation.
  • HE Hight Efficient
  • the PPDU is divided into a preamble and a data part, and the preamble is a legacy field for backwards compatibility in common L-STF ( Legacy Short Training field), L-LTF (Legacy Long Training field), L-SIG (Legacy Signal field), RL-SIG (Repeated Legacy Signa field) may include.
  • L-STF Legacy Short Training field
  • L-LTF Legacy Long Training field
  • L-SIG Legacy Signal field
  • RL-SIG Repeated Legacy Signa field
  • legacy fields may be included in the preamble of not only the EHT PPDU used in 802.11be but also the HE PPDU of the previous version of 802.11ax as shown in FIGS. 7A to 7C .
  • the 11be MU/SU PPDU and 11be TB PPDU which are EHT PPDUs, may further include a U-SIG (Universal Signal field), as shown in FIG.
  • the SU/MU PPDU may further include an EHT-SIG field.
  • U-SIG is a field newly introduced to 11be, an ultra-high-speed communication standard, and is a field commonly included in the next generation 802.11 standard PPDU including 11be.
  • the U-SIG field may continue to be included in the EHT PPDU and the WLAN PPDU of a subsequent generation, and serves to distinguish which generation the PPDU is, including 11be.
  • the U-SIG field is a 64FFT-based OFDM 2 symbol and may carry a total of 52 bits of information. The interpretation of some fields of the U-SIG field may vary depending on the type of PPDU, whether multi-user transmission is performed, and whether OFDMA is transmitted.
  • the EHT-SIG field may be functionally composed of an EHT-VD common field, an EHT-RU (resource unit) allocation subfield, and an EHT-user specific field, and the type of PPDU and Depending on whether multi-user transmission or OFDMA transmission is performed, the interpretation of some fields may be different or some fields may be omitted.
  • EHT-VD common field and the EHT-RU allocation field may be combined to be called an EHT-common field.
  • the configuration and deformation (compression or omission) form of the EHT-SIG field will be described in detail below through examples.
  • the EHT-RU allocation field may be referred to as an RU allocation field.
  • the TB PPDU shown in (b) of FIG. 7 is a trigger-based PPDU and means a PPDU based on a trigger frame. That is, the PPDU shown in (b) of FIG. 7 is a PPDU transmitted in response to the trigger frame, and includes only the U-SIG field after the legacy field in the preamble, but does not include the EHT-SIG field. Therefore, unlike the MU/SU PPDH of FIG. 7( a ), information for decoding the EHT-SIG is not included in the U-SIG, and spatial reuse and puncturing to indicate whether or not to puncture and a pattern. Mode (punctureing mode) information and the like may be included.
  • the terminal may first receive and decode the preamble of the PPDU, and may receive data based on the preamble. For example, the terminal may recognize whether the type of PPDU received through the U-SIG field included in the preamble is SU/MU PPDU, and based on this, recognize the number of content channels constituting the EHT-SIG field can do. Thereafter, the UE may receive data from the recognized RU by decoding the recognized EHT-SIG field and recognizing the RUs allocated through the RU allocation subfield.
  • FIG. 8 shows a U-SIG field of a TB PPDU according to an embodiment of the present invention.
  • the TB PPDU based on the trigger frame can be divided into a preamble and data, and the preamble has a U-SIG field that is commonly included in all PPDUs and the field configuration and inclusion of the preamble vary depending on the type of the PPDU. It may include an EHT-SIG field.
  • the U-SIG field includes a spatial reuse field for spatial reuse (SR) for PPDU transmission and a puncturing mode field for indicating whether puncturing is performed and whether or not puncturing is performed according to each mode and location.
  • SR spatial reuse
  • puncturing mode field for indicating whether puncturing is performed and whether or not puncturing is performed according to each mode and location.
  • Spatial reuse is a spatial resource by the STA adjusting and/or setting an appropriate CCA level according to the situation, and determining whether the corresponding channel is in an idle state or an occupied state based on the adjusted and/or set CCA level and transmitting a signal. How to use it effectively. That is, the STA does not uniformly apply the same CCA level to all channels, and when it is determined that the signal transmitted by the STA will not have a significant interference effect on other STAs during SR, the CCA level is adjusted to a low level (or to the channel By relaxing the criterion for determining whether the state is idle), the transmission resource can be used more efficiently.
  • the U-SIG field includes version independent fields that are not affected by the PHY version, version dependent fields that are affected by the PHY version, a CRC field (4 bits), and a Tail field ( 6 bits).
  • Version indepent fields are PHY VER field (3 bits) for distinguishing PHY version, UL/DL field for indicating UL (Uplink)/DL (Downlink) of the corresponding PPDU, BSS color field, TXOP field, and PPDU BW field may include.
  • the BSS color field indicates BSS color indexes of devices transmitting and receiving PPDUs
  • the TXOP field includes timing information related to a time point at which the PPDU transmission ends.
  • the PPDU BW field may include bandwidth information through which the PPDU is transmitted. If some frequency bands are punctured or not allocated within the bandwidth indicated by the PPDU BW field, the corresponding frequency band may not be used for PPDU transmission. In this case, the PPDU BW may additionally indicate information on some bandwidth to be punctured.
  • version indepent fields are not changed according to the type of PPDU, they may be commonly included not only in the TB PPDU but also in the MU/SU PPDU, and may also be included in the PPDU used in 11be and later standards.
  • the version dependent fields may include a PPDU type field (1b+a bits) and a PPDU type specific field.
  • the PPDU type field indicates the type of the PPDU, and the subfields included in the PPDU type specific field may be changed according to the type of the PPDU.
  • the PPDU type specific field of the TB PPDU may include a spatial reuse field for spatial reuse and a puncturing mode field for indicating whether puncturing is performed and/or a location.
  • a plurality of spatial reuse fields may be included according to bandwidth.
  • four fields of spatial reuse fields 1 to 4 may be included in the PPDU type specific field of the TB PPDU.
  • a value of each of the spatial reuse fields may be encoded corresponding to each frequency domain within a bandwidth indicated by the PPDU BW field of the U-SIG field.
  • all of the space reuse fields 1 to 4 may be encoded to correspond to the 20 MHz indicated by the PPDU BW.
  • the bandwidth is indicated as 40 MHz by the PPDU BW field
  • two spatial reuse fields eg, Nos. 1 and 3
  • the remaining two spatial reuse fields may be encoded corresponding to High 20MHz.
  • each of the four spatial reuse fields may be encoded to correspond to four 20 MHz of 80 MHz, respectively.
  • each of the four spatial reuse fields may be encoded to correspond to the four 40 MHz of 160 MHz, respectively.
  • each of the four spatial reuse fields may be encoded corresponding to three 20 MHz of 12 20 MHz of 240 MHz.
  • three 20 MHz corresponding to spatial reuse field 1 may be three 20 MHz channels having the lowest frequency component within a bandwidth of 240 MHz.
  • each of the remaining three spatial reuse fields may be encoded corresponding to each of three 80 MHz within 240 MHz, and the remaining one spatial reuse field may be encoded with the same value as the three encoded spatial reuse fields.
  • each of the four spatial reuse fields may be encoded corresponding to four 80 MHz of 320 MHz.
  • 80 MHz corresponding to spatial reuse field 1 may have the lowest frequency component of 320 MHz
  • 80 MHz corresponding to spatial reuse field 4 may have the highest frequency component.
  • the puncturing mode field indicates whether puncturing is performed and/or a location, and may be encoded with the same value as the puncturing mode field of the trigger frame.
  • the discontinuous form of the PPDU indicated by the puncturing mode field of the trigger frame and the combined form of the TB PPDU transmitted by multiple users in the uplink may be different.
  • the reason that the discontinuous form of the PPDU indicated by the puncturing mode and the combined form of the TB PPDu are different is because some or all of the RUs designated as RA-RU (Random Access, RU) are not occupied by the STA. This is because a discontinuous form (unutilized bandwidth form) not indicated by the mode may additionally occur.
  • the Puncturing Mode field of the TB PPDU may be used to allow APs and STAs of the adjacent BSS to recognize an unused bandwidth among bands included in the UL BW of the TB PPDU.
  • the TB PPDU may include different spatial reuse fields according to the location (bandwidth area) of the transmitted RU or the type of the TB PPDU. That is, the space reuse field included in the TB PPDU may be differentiated according to the transmission position of the TB PPDU and/or the type of the TB PPDU.
  • each of Spatial Reuse 1 to 8 which are spatial reuse fields included in the two types of TB PPDU, is each of the UL TB PPDU BWs (BWs in which TB PPDUs transmitted by each STA are combined). It can correspond to 40 MHHz.
  • the non-AP STA when the non-AP STA transmits the TB PPDU indicated by the trigger frame transmitted from the AP STA, the non-AP STA specifies the PPDU type according to the location of the RU in which the TB PPDU is transmitted and/or the type of the TB PPDU.
  • the configuration of the spatial reuse field and the puncturing mode field included in the field may be configured differently and transmitted.
  • the non-AP STA may include spatial reuse fields 1 to 4, which are spatial reuse fields, in the PPDU type specific field of the TB PPDU when the location of the RU through which the TB PPDU is transmitted is a primary TB PPDU of 160 MHz.
  • the non-AP STA may include spatial reuse fields, Spatial Reuse 5 to 8, in the PPDU type specific field of the TB PPDU when the location of the RU through which the TB PPDU is transmitted is a secondary 160 MHz TB PPDU.
  • the first type and the second type may be distinguished according to the PHY version of the TB PPDU or may be a PPDU type according to the Wi-Fi standard.
  • the first type may be an HE TB PPDU
  • the second type may be an EHT-TB PPDU.
  • the Non-AP STA may set Spatial Reuse 1 to 8 based on the information included in the trigger frame, and information for setting the spatial reuse field according to the location of the RU through which the TB PPDU is transmitted and/or the type of the TB PPDU is provided. It may be included in different fields of the trigger frame.
  • the TB PPDU of a single STA to be transmitted is transmitted using only one RU(s) of either Primary 160 MHz or Secondary 160 MHz.
  • the TB PPDU of a single STA to be transmitted is transmitted using only one RU(s) of Low 160 MHz or High 160 MHz can be
  • a TB PPDU transmitted through an RU within a primary 160 MHz may include four spatial reuse fields in a PPDU type specific field, and each of the four spatial reuse fields includes four spatial reuse fields within a primary 160 MHz. It may correspond to each RU of 40 MHz.
  • the TB PPDU transmitted through the RU in the secondary 160MHz may include four spatial reuse fields in the PPDU type specific field, and each of the four spatial reuse fields may correspond to each of the four 40MHz RUs in the secondary 160MHz. have.
  • the Primary BW and the Secondary BW may have a bandwidth of 80 MHz.
  • each of the spatial reuse fields (eg, four spatial reuse fields) of the TB PPDU transmitted through the RU of the Priamry 80MHz and/or the Secondary 80MH corresponds to each of the subchannels (20MHz) within 80MHz. have.
  • the PPDU type specific field may additionally include a puncturing mode field indicating a puncturing mode as well as a space reuse field.
  • a different puncturing mode field may be included depending on whether the location of the RU at which the STA that has received the trigger frame transmits the TB PPDU is the Primary BW or the Secondary BW in a manner similar to the space reuse field. That is, the puncturing mode field 1 and the puncturing mode field 2 that are set differently according to the bandwidth (or segment) in which the RU in which the TB PPDU is transmitted is located may be included in the TB PPDU, respectively.
  • the puncturing mode field 1 is included in the TB PPDU transmitted at the primary 160 MHz, indicating a discontinuous channel type at the primary 160 MHz
  • the puncturing mode field 2 is the secondary 160 MHz. It may be included in the TB PPDU transmitted from the secondary to indicate a discontinuous channel type at 160 MHz.
  • FIG 9 shows an example of a trigger format according to an embodiment of the present invention.
  • the trigger frame is a frame control field, a duration field, a resource allocation (RA) field, a Timing Advanced field, a Common Information field, a user information list ( User information list) field, padding and FCS fields.
  • the trigger frame may not include some of the above fields, or may additionally include some fields.
  • the frame control field, duration field, RA field, and TA field are the same as fields included in a general MAC header of the 802.11 standard.
  • the common information field may include information on various parameters used when devices allocated a resource unit through a trigger frame transmit a TB PPDU in response thereto.
  • the user information list may include at least one user information field including individual information for each STA.
  • the Padding field may be included to secure time for generation and preparation of the TB PPDU.
  • the receiving device may not have enough time to recognize the RU allocated to it and generate and transmit the TB PPDU. Accordingly, since the Padding field is additionally positioned after the user information list field of the trigger frame, sufficient time for each receiving device to recognize the RU and prepare the TB PPDU can be secured.
  • Receiving devices that have received the trigger frame may transmit a TB PPDU through the RU allocated by the trigger frame in response to the transmitted trigger frame when the received trigger frame is a trigger frame transmitted thereto. If the trigger frame is transmitted to a plurality of receiving devices, the plurality of receiving devices receiving the trigger frame may transmit the TB PPDU at the same time, and the TB PPDUs may be combined and transmitted in the form of an A (Aggregated)-PPDU. In addition, when PPDUs are transmitted from a plurality of STAs in response to the trigger frame and received in the form of A-PPDUs, the formats of combined TB PPDUs may be different from each other. For example, an HE TB PPDU and an EHT TB PPDU may be combined, or TB PPDUs of different types (or formats) may be combined and transmitted.
  • FIG. 10 shows an example of the configuration of a common information field of a trigger frame according to an embodiment of the present invention.
  • the common information field may include information/parameters commonly applied to all terminals receiving the trigger frame.
  • a trigger type field indicates a trigger type of a trigger frame, and may consist of 4 bits.
  • Table 1 below shows an example of a trigger frame type according to a value of the trigger type field.
  • Trigger Type subfield value Trigger Frame Variant Trigger Type subfield value Trigger Frame Variant 0 Basic 8 EHT-Basic One Beamforming Report Poll (BFRP) 9 EHT-Beamforming Report Poll (BFRP) 2 MU-BAR 10 EHT-MU-BAR 3 MU-RTS 11 EHT-MU-RTS 4 Buffer Status Report Poll (BSRP) 12 EHT-Buffer Status Report Poll (BSRP) 5 GCR MU-BAR 13 EHT-GCR MU-BAR 6 Bandwidth Query Report Poll (BQRP) 14 EHT-Bandwidth Query Report Poll (BQRP) 7 NDP Feedback Report Poll (NFRP) 15 EHT-NDP Feedback Report Poll (NFRP)
  • 4 bits of the trigger type field may be encoded as '0000' to '1111' to individually indicate the type of each trigger frame.
  • the 4 bits of the trigger type field are Basic(0), Beamforming Report Poll(1), MU-BAR(2), MU-RTS(3), Buffer Status Report Poll(4), GCR MU-BAR(5), Bandwidth Query Report Poll(6), NDP Feedback Report Poll(7) EHT-Basic (8), EHT-Beamforming Report Poll(9), EHT-MU-BAR(10), MU- RTS(11), EHT-Buffer Status Report Poll(12), EHT-GCR MU-BAR(13), EHT-Bandwidth Query Report Poll(14), EHT-NDP Feedback Report Poll(15) type trigger frame.
  • Basic(0) Beamforming Report Poll(1), MU-BAR(2), MU-RTS(3), Buffer Status Report Poll(4), GCR MU-BAR(5), Bandwidth Query Report Poll(6), NDP Feedback Report Poll(7) EHT-Basic (8), EHT
  • a bit value of '0' to '7' by the trigger type field may indicate the same trigger frame type as the trigger type field of the HE (802.11ax). Accordingly, when the trigger frame type field, which is the HE trigger frame based on the trigger frame, has a value of '0' to '7', the trigger frame can be configured in the same way as in 802.11ax, so that the common information field and trigger dependent common information Field and user fields may be configured and encoded in the same format.
  • the trigger frame type with bit values of '8' to '15' by the trigger type field may be indicated only when the PHY version of the trigger frame is the EHT 11be. That is, only when the trigger frame is an EHT-based EHT trigger frame, the bit value by the trigger type field may be set to one of the values '8' to '15'.
  • EHT trigger frames based on EHT of trigger type field values of '8' to '15' may perform the same function as corresponding trigger frames from '0' to '7', respectively.
  • a trigger frame having a trigger type value of '8' to '15' may further include an additional bandwidth field, a puncturing mode field, and/or an additional UL spatial reuse field for additional spatial reuse.
  • additional information fields may be used to apply a function newly added to the EHT (eg, 240/320 MHz operation, multi-RU allocation, etc.) to an operation based on a trigger frame.
  • a field that is functionally identical to fields included in a trigger frame having a trigger type field value of '0' to '7' may be extended or may be added using the Reserved field.
  • the size of the UL BW field may vary according to the value of the trigger type field. For example, when the value of the trigger type field is '0' to '7', the size of the UL BW field is 2 bits. However, when the trigger type field has a value of '8' to '15', the size of the UL BW field is 3 bits, and there are six BW modes (20, 40, 80, 160 (80+80), 240 (160+80) ), 320 (160 + 160) MHz).
  • the size of the UL spatial reuse field may vary according to the value of the trigger type field. For example, when the trigger type field has a value of '0' to '7', the size of the UL spatial reuse field is 16 bits. However, when the trigger type field has a value of '8' to '15', the UL spatial reuse field may be composed of 8 spatial reuse fields having a size of 4 bits and a total of 32 bits.
  • the reason that the Spatial Reuse field is composed of a total of 8 is that when only 4 Spatial Euse fields are used for a 240 MHz or 320 MHz PPDU as before, the BW corresponding to each spatial Reuse field reaches a maximum of 80 MHz, so that Spatial Reuse is Because it doesn't work efficiently. Accordingly, when the number of Spatial Reuse fields is increased to 8, more efficient Spatial Reuse operation is possible in response to only a maximum of 40 MHz.
  • the UL HE-SIG-A2 Reserved field may be used as a Puncturing mode field when the Trigger Type is 8 to 15.
  • FIG. 11 shows an example of the configuration of an additional information field according to the format of a trigger frame according to an embodiment of the present invention.
  • the trigger frame may include an additional information field depending on whether it is HE-based or EHT-based, and the additional information field further includes additional information for a response of a TB PPDU based on the EHT trigger frame. can do.
  • the trigger frame is an additional trigger dependent additional information field shown in FIG. 11 . It may further include an additional Trigger Dependent Common Info subfield.
  • the additional information field may include an additional bandwidth field, a puncturing mode field, and/or an additional UL spatial reuse field for additional spatial reuse.
  • the common information field except for the additional information field has the same bit and field configuration as the trigger frame with the trigger type field value of '0' to '7' and the trigger frame with the trigger type field value of '8' to '15' can have
  • the additional information field shown in FIG. 11 may be commonly included in an EHT-based trigger frame in which the trigger type field value is '8' to '15', and when the trigger type field value is '13' (EHT-GCR MU-BAR) can be included with BAR Control (2 Octets) and BAR Information (2 Octets).
  • EHT-GCR MU-BAR EHT-GCR MU-BAR
  • the additional information field includes information additional information for generating an EHT TB PPDU when a PPDU is transmitted in response to an EHT-based trigger frame.
  • the additional information field may be located immediately after the common information field, and may have a size of 1 or 2 bits.
  • a specific field positioned immediately before the additional information field may indicate whether the additional information field is included after the common information field. That is, when the value of the specific field is set to a specific value ('1' or '0'), the non-AP STA may recognize that the additional information field is included after the common information field.
  • the trigger frame may be recognized as an EHT trigger frame, and the non-AP STA may respond with an EHT TB PPDU.
  • the trigger frame may be recognized as a HE trigger frame, and the non-AP STA may respond with a HE TB PPDU.
  • the specific field may have a size of 1 bit, and may be 'B63', 'B53', or other bits.
  • AID association identifier
  • the Non-AP STA may respond through the HE TB PPDU, and may respond through the HE TB PPDU or EHT TB PPDU based on the received trigger frame.
  • the non-AP STA transmits only the EHT TB PPDU in response to the trigger frame.
  • the non-AP STA may respond with an HE TB PPDU or EHT TB PPDU depending on the configuration and type of the trigger frame, but the location of the allocated RU is located in the Secondary BW. If located, the non-AP STA may respond only with the EHT TB PPDU.
  • the non-AP STA responds with a TB PPDU or EHT TB PPDU can do. Specifically, after receiving the trigger frame, the non-AP STA responds with a HE TB PPDU when the format of the user information field included in the trigger frame is the HE format. However, when the format of the user information field included in the trigger frame is the EHT format, the non-AP STA may respond with an EHT TB PPDU.
  • the additional information field may be referred to as a special user information field, and fields included in the additional information field may be interpreted together with fields included in common information.
  • 1 bit or 2 bits may be allocated to the additional UL BW field, and may be interpreted in combination with the bandwidth field included in the common information field. That is, when the additional information field includes the additional UL bandwidth field, the non-AP STA may recognize the bandwidth for transmitting the TB PPDU by considering the additional UL bandwidth field in addition to the bandwidth field of the common information field.
  • 6 out of 8 (or 16) BW modes that can be indicated by 1 bit (or 2 bits) of the additional UL BW field to 2 bits of the bandwidth field are 20, 40, 80, 160 (80+80), respectively. ), 240 (160+80), and 320 (160+160) MHz.
  • the additional UL spatial reuse field may signal a value for a spatial reuse operation for a frequency domain not indicated by the UL spatial reuse field of the common field.
  • the UL spatial reuse field of the common information field may include four spatial reuse fields, and the additional UL spatial reuse field may include other four spatial reuse fields to indicate a total of eight spatial reuse fields for the entire bandwidth. That is, the plurality of spatial reuse fields included in the common information field and the additional UL spatial reuse fields included in the additional information field may indicate frequency bands for spatial reuse operations for different bandwidths, respectively.
  • the additional spatial reuse fields included in the additional information field are spatial reuse for Secondary BW.
  • a frequency band for operation may be indicated. Therefore, when the non-AP STA transmits the TB PPDU in the Primary BW (or the TB PPDU is the HE TB PPDU), the TB PPDU can be generated using the spatial reuse fields included in the common information of the trigger frame. have. However, when the non-AP STA transmits a TB PPDU in the secondary BW (or when the TB PPDU is an EHT TB PPDU), the TB PPDU using at least one space reuse field included in the additional information field of the trigger frame. can create
  • TB PPDU can be generated using
  • the puncturing mode field may signal the discontinuous form of the PPDU in which the trigger frame is transmitted.
  • the trigger frame may be transmitted using discontinuous channels excluding some channels of the operation BW, and the discontinuous channel type of the RU to which the trigger frame is transmitted may be indicated through the puncturing mode field.
  • the puncturing mode field of the trigger frame may be encoded by applying the same mode as the puncturing mode field of the SU PPDU.
  • a bitmap (8-bit or 16-bit bitmap) indicating whether each 20 MHz channel is used to signal the discontinuous channel type of the entire PPDU BW may be included.
  • FIG. 12 shows an example of a spatial reuse field and a puncturing mode field for uplink transmission according to an embodiment of the present invention.
  • FIG. 12A shows an embodiment of a UL spatial reuse field for an uplink spatial reuse operation, and consists of a total of eight spatial reuse fields.
  • Four of the eight spatial reuse fields appearing in the trigger frame for a bandwidth of 320 (or 160+160) MHz indicate values for spatial reuse corresponding to Low 160 or 80 MHz, and the remaining four are High 160 or 80 It may indicate a value for spatial reuse corresponding to MHz.
  • the plurality of spatial reuse fields shown in (a) of FIG. 12 may be divided and included in the UL spatial reuse field included in the common field and the additional UL spatial reuse field included in the additional information field. That is, some of the plurality of spatial reuse fields may be included in the UL spatial reuse field included in the common field, and the remaining spatial reuse fields may be included in the additional UL spatial reuse field included in the additional information field.
  • Each spatial reuse field consists of 4 bits, and may indicate a spatial reuse value applied to a bandwidth of up to 40 MHz.
  • the four spatial reuse fields corresponding to the primary 160 MHz are Low 40 MHz of Low 80 MHz, High 40 MHz of Low 80 MHz, Low 40 MHz of High 80 MHz, and High 40 MHz, respectively. of High 80 MHz.
  • the four spatial reuse fields corresponding to High 160 MHz may correspond to Lowest 40, Low 40, High 40, and Highest 40 MHz of High 160 MHz, respectively.
  • each of the four spatial reuse fields corresponding to 80 MHz may be set to a spatial reuse value indicating 20 MHz.
  • each of the four spatial reuse fields among the eight spatial reuse fields included in the trigger frame is 40 MHz (Lowest 40 MHz, Low 40 MHz, High 40 MHz, Highest) 40 MHz), and the remaining four may be encoded with the same value as the spatial reuse field corresponding to each 40 MHz.
  • each of the four spatial reuse fields of the eight spatial reuse fields corresponds to 20 MHz (Lowest 20 MHz, Low 20 MHz, High 20 MHz, Highest 20 MHz) and the remaining 4 may be encoded with the same value as the Spatial Reuse field corresponding to each 20 MHz.
  • each of the four spatial reuse fields of the eight spatial reuse fields corresponds to 20 MHz (Low 20 MHz, High 20 MHz), and the remaining 6 fields each correspond to 20 MHz. It may be encoded with the same value as the spatial reuse field corresponding to MHz.
  • all eight spatial reuse fields may indicate a spatial reuse value corresponding to the primary 20 MHz.
  • the UL spatial reuse field may include four spatial reuse fields.
  • each of the four spatial reuse fields may indicate a spatial reuse value of 80 MHz for a 320 MHz bandwidth, and may indicate a spatial reuse value of 40 MHz for a 160 MHz bandwidth, respectively.
  • it may represent a value of spatial reuse of 20 MHz, respectively.
  • two spatial reuse fields may correspond to low or high 20 MHz, respectively, and the remaining two may be encoded with the same values as spatial reuse fields corresponding to 20 MHz, respectively.
  • all four spatial reuse fields may indicate a spatial reuse value corresponding to the primary 20 MHz.
  • the puncturing mode field indicates the type of a discontinuous channel for a PPDU through which a trigger frame is transmitted. That is, the puncturing mode for the bandwidth in which the PPDU, which is the trigger frame, is transmitted may be indicated by the puncturing mode field.
  • the puncturing mode may indicate whether a part of the entire bandwidth is punctured and a puncture location.
  • the puncturing mode field may be included in an additional information field other than the (UL HE-SIG-A2) Reserved field of the common information field, and may include two puncturing mode subfields. If two puncturing mode subfields are included, the discontinuous form of a channel through which a trigger frame included in a 320MHz or 240MHz PPDU is transmitted is divided into a 160MHz bandwidth section, and whether puncturing is performed by the puncturing mode subfield and A location may be indicated.
  • FIG. 13 shows an example of transmission of a trigger frame and a trigger frame-based TB PPDU according to an embodiment of the present invention.
  • each STA may transmit a response frame in response to the trigger frame based on the plurality of spatial reuse fields.
  • STAs 1 to N receiving the trigger frame from the AP STA check the UL spatial reuse field included in the common information field of the trigger frame, and set the values of four spatial reuse fields included in the UL spatial reuse field to TB
  • a TB PPDU may be generated by encoding each of the space reuse fields 1 to 4 included in the U-SIG field of the PPDU.
  • FIG. 14A and 14B show another example of transmission of a trigger frame and a trigger frame-based TB PPDU according to an embodiment of the present invention.
  • TB PPDUs when a plurality of spatial reuse fields are indicated through a trigger frame, TB PPDUs may be respectively generated and transmitted/received through different spatial reuse fields.
  • a plurality of spatial reuse fields may be transmitted through the trigger frame.
  • some of the plurality of spatial reuse fields may be included in the common information field, and the remaining spatial reuse fields may be included in the additional information field.
  • the non-AP STA uses the space reuse fields included in the common information field or the additional information field according to the location of the RU allocated to it or whether the response frame to the trigger frame is an HE TB PPDU or an EHT TB PPDU. to generate a response frame.
  • an EHT TB PPDU may be generated using the space reuse fields included in the additional information field, and the generated EHT TB PPDU may be transmitted as a response frame of the trigger frame.
  • the non-AP STA has common information when the location of the RU allocated to it is included in the Primary BW or the format related to the trigger frame is the HE format (eg, when the format of the user information field is the HE format).
  • a HE TB PPDU may be generated using the spatial reuse fields included in the field, and the generated HE TB PPDU may be transmitted as a response frame of a trigger frame.
  • the position of the RU allocated by the trigger frame is located at Low 160 MHz or Low 80 MHz with respect to the center frequency.
  • STAs 1 to STA n select spatial reuse fields 1 to 4 corresponding to Low 180 MHz or Low 80 MHz from among 8 spatial reuse fields 1 to 8 included in the trigger frame.
  • STAs 1 to STA n may encode the selected spatial reuse fields 1 to 4 into spatial reuse fields 1 to 4 included in the U-SIG field of the TB PPDU, which is a response frame to the trigger frame, respectively.
  • spatial reuse fields 1 to 4 may be spatial reuse fields included in the common information field of the trigger frame, and by STA 1 to STA n When the generated TB PPDU is an EHT TB PPDU, the spatial reuse fields 1 to 4 may be spatial reuse fields included in the additional information field of the trigger frame.
  • the position of the RU allocated by the trigger frame is STA n+1 located at 160 MHz High or 80 MHz High with respect to the center frequency.
  • to STA N selects spatial reuse fields 5 to 8 corresponding to 180 MHz High or 80 MHz High from among eight spatial reuse fields 1 to 8 included in the trigger frame.
  • STA n+1 to STA N may encode the selected spatial reuse fields 5 to 8 into spatial reuse fields 1 to 4 included in the U-SIG field of the TB PPDU, which is a response frame to the trigger frame, respectively.
  • spatial reuse fields 5 to 8 may be spatial reuse fields included in the common information field, and are generated by STA 1 to STA n.
  • spatial reuse fields 5 to 8 may be spatial reuse fields included in the additional information field.
  • the trigger frame may indicate transmission of an HE TB PPDU and/or an EHT TB PPDU.
  • at least one non-AP STA that has received the trigger frame may transmit an HE TB PPDU or an EHT TB PPDU in response to the trigger frame.
  • a criterion for at least one non-AP STA to transmit a TB PPDU or an EHT TB PPDU may be based on a location of an allocated RU and/or a format related to a trigger frame.
  • an EHT TB PPDU may be generated and transmitted in response to the trigger frame.
  • the position of the RU allocated by the trigger frame is Primary BW including the primary channel or the format related to the trigger frame is the HE format (eg, when the format of the user information field is the HE format)
  • the trigger frame In response, an HE TB PPDU may be generated and transmitted.
  • 15 is a flowchart illustrating an example of a method for selecting a space reuse field for generating a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • the STA that has received the trigger frame can recognize the RU for uplink transmission by decoding the preamble of the trigger frame, and use spatial reuse fields of different trigger frames according to the recognized location of the RU to TB A PPDU can be generated.
  • the AP STA may transmit a trigger frame indicating transmission of the TB PPDU, and the non-AP STA may receive the trigger frame from the AP STA and decode the received trigger frame (S15010).
  • the non-AP STA may generate a TB PPDU to transmit the TB PPDU indicated by the trigger frame in response to the received trigger frame.
  • the non-AP STA may use information included in the trigger frame to generate the TB PPDU.
  • the non-AP STA may decode the trigger frame and recognize the RU allocated to transmit its TB PPDU through the RU allocation information field of the trigger frame.
  • the non-AP STA determines whether the location of the RU allocated for transmission of the TB PPDU is a high frequency band (or a primary BW including a primary channel) based on the center frequency of the entire bandwidth or a low frequency (Low Frequency). ) band (or Second BW that does not include the Priamry channel). If the location of the allocated RU is located in an upper frequency band (or Primary BW), the non-AP STA encodes the spatial reuse fields 1 to 4 included in the trigger frame into the spatial reuse fields 1 to 4 of the TB PPDU. to generate a TB PPDU (S15020).
  • spatial reuse fields 1 to 4 of the trigger frame used for generation of the TB PPDU may be spatial reuse fields included in the common information field of the trigger frame.
  • the non-AP STA encodes spatial reuse fields 5 to 8 included in the trigger frame into spatial reuse fields 1 to 4 of the TB PPDU. to generate a TB PPDU (S15030).
  • spatial reuse fields 5 to 8 of the trigger frame used for generation of the TB PPDU may be spatial reuse fields included in the additional information field of the trigger frame.
  • FIG. 16 illustrates an example of a spatial reuse operation according to the number of spatial reuse fields for a frequency band according to an embodiment of the present invention.
  • a bandwidth region corresponding to the spatial reuse field and a spatial reuse result of OBSS may vary according to the number of spatial reuse fields for a bandwidth for PPDU transmission.
  • each of the four OBSS1 to 4 is -65, - Interference of 60, -58, -50 dBm may be received.
  • each of the four spatial reuse fields may be set to a value related to a spatial reuse limitation allowed for 80 MHz.
  • each of the eight spatial reuse fields may be set to a value related to a spatial reuse limitation allowed for 40 MHz.
  • the value set in the space reuse field may be set to the strictest value among the spatial reuse conditions applied to the BW corresponding to the space reuse field. Accordingly, one spatial reuse field corresponding to 80 MHz may be set to a lower value (spatial reuse is more restricted) among two spatial reuse field values corresponding to two 40 MHz existing within 80 MHz, respectively.
  • the spatial reuse value of the bandwidth in which each of the primary channels of STAs is located in OBSS 1 to 4 is It may be PSR_DISALLOW, -68 dBm, -68 dBm, or PSR_DISALLOW.
  • the STA confirms that the space reuse operation is not allowed for OBSS1 and OBSS4 and does not attempt channel access.
  • OBSS 2 and OBSS3 can know that spatial reuse is allowed in the band where their primary channels exist, but cannot perform the backoff procedure for channel access because their interference is greater than the spatial reuse threshold.
  • spatial reuse of the bandwidth in which the primary channels of each of the STAs are located in OBSS 1 to 4 Values may be -72 dBm, -38 dBm, -41 dBm, PSR_DISALLOW.
  • OBSS 2 and OBSS 3 can know that spatial reuse is allowed in the band where their primary channels exist, and their interference (from the TB PPDU) is smaller than the spatial reuse threshold, so the backoff procedure for channel access After performing , the transmission can be performed.
  • FIG 17 shows an example of a method for transmitting a trigger frame according to an embodiment of the present invention.
  • the transmission type of the trigger frame may vary according to the type and number of transmitted resources.
  • the trigger frame of 11be since the trigger frame of 11be is a MAC frame, it may be transmitted over 20, 40, 80, 160, and 320 MHz according to the BW of the PPDU through which the trigger frame is transmitted.
  • the trigger frame can be transmitted only through the remaining frequency bands except for the channel determined as BUSY as a result of the CCA within the operation BW.
  • the discontinuous form of the PPDU in which the trigger frame is transmitted may be signaled by the EHT PHY appearing before the MAC frame including the trigger frame.
  • the discontinuous form of the PPDU in which the trigger frame is transmitted may be limited depending on the discontinuous form of the SU PPDU allowed in the EHT.
  • the trigger frame appears repeatedly in each 20 MHz PPDU, and may be transmitted in a discontinuous form that does not appear only in a specific channel (the channel that is BUSY as a result of CCA).
  • the transmission form of the trigger frame may be a method similar to the U-SIG transmission method shown in the punctured PPDU.
  • two trigger frames may be transmitted simultaneously. This is because the operation BW of the STA transmitting the TB PPDU through the trigger frame may be included in only a part of the BW of the trigger frame transmitted by the AP. For example, the operation BW of an STA transmitting a UL MU TB PPDU through a 320 MHz trigger frame may be limited to exist only in Low 160 MHz or High 160 MHz.
  • the two trigger frames may be transmitted by dividing the PPDU BW into two regions.
  • the criterion for dividing the BW of the PPDU into two regions may be whether the BW of one region is 160 MHz. That is, the BW of the PPDU may be divided so that the BW for one PPDU is 160 MHz.
  • each trigger frame appearing in the two regions may appear in a discontinuous form within each region.
  • the discontinuous form applied to the two trigger frames may be limited depending on the discontinuous form of the SU PPDU allowed for the BW including the two trigger frames.
  • the discontinuous channel type allowed for Trigger 1 may be limited only to the discontinuous channel type allowed for the 160 MHz SU PPDU.
  • FIG. 18 shows an example of a TB PPDU including a puncturing mode according to an embodiment of the present invention.
  • the STA may include information on the puncturing mode obtained through the trigger frame in its TB PPDU when configuring its TB PPDU.
  • the puncturing mode field is included in the signaling field of the TB PPDU as shown in (a) of FIG. 18, the OBSS receiving the TB PPDU is a TB of 20 MHz obtained through its main channel.
  • a discontinuous form of a channel occupied by all TB PPDUs transmitted together with the TB PPDU can be recognized using only the PPDU signaling information.
  • the information on the puncturing mode may be used to more precisely classify a frequency domain corresponding to the spatial reuse value. For example, when it is obtained through puncturing mode information on whether a part of the BW area corresponding to the spatial reuse field has been punctured, the BW corresponding to the spatial reuse field uses the punctured bandwidth through the information on the puncturing mode. It may correspond only to the remaining areas except for the area.
  • the information of the spatial reuse field corresponding to each BW is selected from among the corresponding BWs. It can be applied only to the remaining BW that is not punctured.
  • each STA has a limitation that it should perform UL transmission using an RU allocated through a trigger frame from an AP through a trigger frame without being based on its own channel state (IDLE or BUSY).
  • the above-described problem in which the RU selection on the STA side is limited may be caused by the fact that the TB PPDU reception procedure of the AP side is different from the general reception procedure.
  • a procedure for STAs that have received a trigger frame to respond with a TB PPDU and an operation for the AP to receive the TB PPDUs UL transmitted by the STAs will be described later. which is shown through FIGS. 19 and 20 .
  • FIG. 19 shows an example of a procedure for allocating a resource unit and responding to a TB PPDU through a trigger frame according to an embodiment of the present invention.
  • the AP transmits a trigger frame using the 80 MHz band identified as IDLE to STA1 and STA2 in the Low 40 MHz and High 40 MHz bands, respectively (484-tone size RUs, respectively). can be assigned.
  • the trigger frame may be understood as a trigger frame for the UL OFDMA TB PPDU because RUs located at different frequencies are allocated to two STAs.
  • the trigger frame After receiving the trigger frame, STA1 and STA2 decode the received trigger frame, the trigger frame includes two user information fields, and one user information field among the two user information fields You can see that it is an information field. In this case, each STA may recognize its own user information field based on whether the AID12 subfield of the user information field includes information related to its own AID (eg, its own AID LSB 12 bit).
  • STA1 can confirm that the RU allocated to it is a 484-tone RU located at Low 40 MHz through the RU allocation subfield included in its user information field, and STA2 is the RU allocated to itself in the same way as STA1. It can be recognized that it is a 484-tone RU located in High 40 MHz.
  • the trigger frame includes information related to the RU (and spatial stream (SS)) allocated to each STA, as well as various encoding parameters and PPDU length information to be applied when each STA generates a TB PPDU in response to the trigger frame. and the like.
  • Each STA decodes the trigger frame to confirm the RU allocated to it, and then applies the encoding parameter indicated through the trigger frame to generate a TB PPDU.
  • the generated TB PPDU of each STA is simultaneously UL transmitted, and the AP may receive the UL OFDMA PPDU in which the TB PPDU transmitted by each STA is combined.
  • the received OFDMA TB PPDU in order for the AP to obtain the TB PPDU UL transmitted by each STA, the received OFDMA TB PPDU must be separated into the TB PPDU of each STA.
  • the MAC of the AP which is the subject that generated the trigger frame, knows the location and shape of the RU it has allocated to each STA, whereas the PHY of the AP, which is the subject that separates and decodes the OFDMA TB PPDU, is the OFDMA TB it will receive.
  • the PPDU configuration is unknown.
  • the MAC sublayer of the AP generates a trigger frame, requests the PHY layer to transmit it, and then provides information necessary to receive the expected TB PPDU as a response to the transmitted trigger frame to the PHY. It defines the procedure provided to the layer.
  • PHY-TRIGGER.request primitive before the TB PPDU of STAs is received in response to the trigger frame requesting transmission of the TB PPDU after the MAC performs a transmission request for the trigger frame.
  • PHY-TRIGGER.request is issued to request the PHY entity to set parameters for reception of the TB PPDU.
  • PHY-TRIGGER.request primitive provides a TRIGVECTOR parameter
  • the TRIGVECTOR parameter includes BW information (CH_BANDWIDTH) and L-SIG Length information (UL_LENGTH) of predicted TB PPDUs.
  • the PHY performs preparation work for receiving TB PPDUs, such as setting the BW of the Rx mode by using the BW information and the Length information of the TB PPDUs received from the MAC.
  • the TRIGVECTOR parameter includes AID12_LIST and RU_ALLOCATION_LIST of STAs to which RUs are allocated through a trigger frame.
  • AID12_LIST and RU_ALLOCATION_LIST are used to distinguish the subcarrier in which the TB PPDU of each STA exists in the TB PPDUs (OFDMA UL PPDU) received by the PHY from multiple STAs. can be separated.
  • the TRIGVECTOR includes encoding-related parameters commonly applied to TB PPDUs and MCS information used in the TB PPDU of each STA. Using the encoding-related information, the PHY can decode the TB PPDU of each STA.
  • the TB PPDU reception procedure may be different from the general PPDU reception procedure.
  • the PHY does not obtain information for decoding of the TB PPDUs being received from the preamble and SIG fields of the TB PPDUs being received, but rather the reception of TB PPDUs based on the information provided by the MAC. can wait and decode.
  • FIG. 20 shows an example of a method of receiving a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • the PHY of the AP may receive a TRIGVECTOR from the MAC sublayer and receive TB PPDUs predicted based on information included in the TRIGVECTOR.
  • the MAC sublayer issues a PHY-TRIGGER.request primitive to the local PHY entity.
  • the time at which the TRIGGER.request primitive is issued may be after the MAC requests the PHY to transmit the trigger frame and before the TB PPDU is received in response to the trigger frame.
  • the PHY that has received the TRIGGER.request primitive from the MAC can recognize that the BW of TB PPDUs expected to be received is 80 MHz through the CH_BANDWIDTH parameter among the parameters of the TRIGVECTOR. Thereafter, the PHY performs reception of 80 MHz TB PPDUs, and uses AID12_LIST and RU_ALLOCATION_LIST among the parameters of the TRIGVECTOR received from the MAC to separate the TB PPDUs received through OFDMA into TB PPDUs of each user.
  • the process of dividing TB PPDUs into TB PPDUs of each STA may be performed using the AID12_LIST parameter and the RU_ALLOCATION_LIST parameter among the TRIGVECTOR parameters.
  • the AID12_LIST parameter may include 12-bit AID LSBs of STA1 and STA2 as entries.
  • the PHY indicates that receiving TB PPDUs are STA1's TB PPDU and STA2's TB PPDU.
  • the PHY checks information on the appearance of the TB PPDUs of STA1 and STA2 through RU_ALLOCATION_LIST, so that the RU of the STA is a 484-tone RU located in the Low 40 MHz band, and the RU of STA2 is 484 located in the High 40 MHz. -tone RU can be confirmed. Accordingly, the PHY may determine the location of the RU in which TB PPDU1 and TB PPDU2 transmitted by STA1 and STA2 are transmitted, and then attempt decoding for each.
  • reception of TB PPDUs can be completed only with information transmitted from the MAC of the receiving device to the PHY. Accordingly, the receiving device may receive the TB PPDU of each STA without decoding the preamble and the SIG field of the TB PPDU transmitted by each STA.
  • the HE-SIG-A field of the 11ax TB PPDU is configured to include information (BSS color, TXOP, four Spatial reuse fields) to help the operation of OBSS devices instead of information necessary for reception and decoding of the TB PPDU.
  • information BSS color, TXOP, four Spatial reuse fields
  • the reception of the TB PPDU can be performed based on the information provided to the PHY by the MAC of the receiving device, which is the subject of generating the trigger frame, instead of obtaining information from the preamble and SIG fields of the PPDU being received. have.
  • the STA receiving the trigger frame uses an RU other than the RU allocated through the trigger frame or encodes the PPDU using a parameter value other than the parameter value indicated through the trigger frame, the trigger frame is transmitted. After the TB PPDUs are received, the device cannot receive and process the TB PPDUs.
  • the PHY of the AP that transmitted the trigger frame is specified from the OFDMA TB PPDU received from multiple STAs. It may fail to separate the TB PPDU transmitted by the STA.
  • the specific STA encodes the PPDU by using a parameter value other than the parameter value indicated through the trigger frame
  • the PHY of the AP that transmitted the trigger frame is separated from the OFDMA TB PPDU that received the TB PPDU of the specific STA.
  • decoding may fail.
  • STAs that transmit the TB PPDU in response after receiving the trigger frame generate and transmit the TB PPDU by using only the RU assigned to them and the indicated parameter values. may be limited.
  • the STA when the STA responds to the TB PPDU after receiving the trigger frame, limiting the use of only the RU allocated through the trigger frame and the indicated parameters means that the AP can successfully receive and decode the TB PPDU responded to by the STA.
  • the STA may not be able to efficiently utilize the RU allocated to it.
  • 21 shows another example of a method of receiving a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • the RU allocated through the trigger frame of the AP cannot be used by the STA for transmission of the TB PPDU.
  • the AP allocates 996-tone size RUs located in the Low 80 MHz band to STA1, and allocates 242+(242)+484-tone size RUs located in the High 80 MHz band to STA2.
  • a 20 MHz band (242-tone size RU) not allocated to both STAs is a sub determined as BUSY as a result of the CCA performed before the AP sends the trigger frame. It may be a band in which a channel exists.
  • the trigger frame transmitted by the AP will be received by STAs of the BSS operated by the AP, and STA1 and STA2 own their user information field among at least one user information field included in the user information list field of the received trigger frame. can be recognized through the AID field.
  • STA1 can recognize that the RU allocated to it is a 996-tone size RU of the Low 80 MHz band through the RU allocation subfield existing in the confirmed user information field, and STA2 uses the same method as STA1. It can be recognized that the RU allocated to the RU is a 242+(242)+484-tone size RU located in the High 80 MHz band.
  • the CCA may be an ED-based CCA.
  • the operation for the STA to perform ED-based CCA may be limited to a case where the CS Required subfield indicated in the common information field of the received trigger frame is 1, and may be performed.
  • the ED-based CCA may include one or both of Energy Detect and virtual carrier sense (NAV) with per 20 MHz CCA sensitivity.
  • STAs that perform ED-based CCA after being allocated an RU through a trigger frame perform ED-based CCA on the entire BW region of the PPDU including the trigger frame, or receive the RU allocated to them through the trigger frame.
  • ED-based CCA may be performed only for the included subchannel(s).
  • the TB PPDU using the allocated RU cannot perform the transfer.
  • STA1 and STA2 may perform CCA on four 20 MHz subchannels of the Low 80 MHz band and three 20 MHz subchannels of the High 80 MHz band allocated to them, respectively.
  • both STAs perform CCA on some of the subchannels present in the RU to which both STAs are allocated (one for STA1, 2 for STA2) subchannel) is BUSY. In this case, both STA1 and STA2 may not be able to transmit the TB PPDU.
  • the present invention provides a TB PPDU based on the CCA results of the RU and the 20 MHz subchannels present in the allocated RU.
  • a 20 MHz subchannel existing in an RU may be used to indicate a 20 MHz subchannel in which a subchannel corresponding to the RU is located. That is, there is one 20 MHz subchannel included in 26, 52, 106, and 242-tone size RUs, and 2 and 4 20 MHz subchannels included in 484 and 996-tone size RUs, respectively.
  • the shape of the end-use RU determined by the STA based on the CCA result may be determined in consideration of the previously agreed RU configuration. The above-described method for determining the end-use RU type will be described in detail through embodiments to be described later.
  • the STA does not utilize the allocated RU as it is, and the STA allocated the RU through the trigger frame does not use the allocated RU as it is, and based on the CCA result, all of the IDLE 20 MHz subchannels existing in the allocated RU.
  • the TB PPDU may be UL transmitted using a portion.
  • FIG. 22 shows another example of a method for receiving a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • the device receiving the trigger frame may transmit (respond) the TB PPDU by using only a part of the RUs allocated through the trigger frame.
  • STA1 and STA2 may UL transmit the TB PPDU by using only subchannels excluding the subchannel considered as BUSY as a result of CCA among the RUs assigned to them, respectively.
  • the operation of the STA to selectively change the RU configuration used for generation and transmission of the TB PPDU according to the CCA result for the 20 MHz subchannel existing in the RU to which it is allocated is an operation that can be implemented without any particular performance problem.
  • the reason is that, in the process of generating the TB PPDU after the STA receives the trigger frame, the RU configuration checked through the trigger frame is not used as it is, and only a procedure for updating according to the CCA result is added. Because this can be implemented.
  • the AP has an RU allocated to each STA through a trigger frame and an RU occupied by the TB PPDU transmitted by each STA as shown in the embodiment of FIG. 22 . It may be impossible to successfully decode the OFDMA PPDUs (TB PPDUs) when ⁇ is mismatched.
  • FIG. 23 shows another example of a method of receiving a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • the AP may fail to receive UL OFDMA.
  • the PHY of the AP will be received through a 996-tone size RU in which the TB PPDU1 of STA1 is located in the Low 80 MHz band based on the TRIGVECTOR received from the MAC, It can be predicted that the TB PPDU2 of STA2 will be received through a 242+484-tone size RU located in the High 80 MHz band.
  • the AP predicts that there will be 80 MHz TB PPDU1 in the Low 80 MHz band and tries to decode the 80 MHz PPDU, and the High 80 MHz band is 20 + (20) + 40 MHz Decoding of 20 + (20) + 40 MHz PPDU may be attempted by predicting that TB PPDU2 will be present.
  • the TB PPDU1 and TB PPDU2 transmitted by STA1 and STA2, respectively have different forms from the PPDU that the AP attempts to decode. Accordingly, the AP fails to decode the TB PPDU transmitted in response to the trigger frame.
  • the AP is utilized by each STA.
  • a signaling or procedure for recognizing the type of one RU is required.
  • the present invention provides a method for allowing the AP to recognize the form (RU configuration) of the TB PPDU being received through the signaling field of the TB PPDU when the AP receives the TB PPDU, and the AP per 20 MHz CCA for each STA.
  • the STA allocated to the RU through the trigger frame does not utilize the allocated RU as it is, but some RUs included in the allocated RU for CCA results or implementation reasons.
  • the RU used by each STA when configuring the Dynamic TB PPDU is not only the CCA result, but also the subchannels in the allocated RU due to the limitation of the M-RU (Multiple RU) configuration allowed in the standard, or the implementation constraint. Among them, even some subchannels determined as IDLE may be excluded.
  • M-RU Multiple RU
  • each STA does not use all of the available RUs and uses only some RUs to generate a Dynamic TB PPDU. It can also be configured.
  • the AP After transmitting the trigger frame, the AP, which receives the Dynamic TB PPDU(s) in response to the trigger frame, does not depend only on the RU information allocated to each STA through the trigger frame, unlike the conventional 11ax AP, but rather the The RU configuration in which the Dynamic TB PPDU is transmitted must be identified.
  • each STA includes information on the RU through which the Dynamic TB PPDU configured by the STA is transmitted in the preamble, and the AP receives/decodes the preamble of the Dynamic TB PPDU transmitted by each STA, thereby providing the Dynamic TB PPDU transmitted by each STA. form can be checked.
  • the AP must decode at least one subchannel in which the preamble of the Dynamic TB PPDU transmitted by each STA appears in order to check the form of the entire RU in which the Dynamic TB PPDU appears.
  • the AP when a plurality of Dynamic TB PPDUs are answered through a single trigger frame, the AP must decode the preambles of the plurality of Dynamic TB PPDUs that are answered, respectively, and since the operation of decoding the plurality of preambles must be performed in parallel, the AP side It may be an operation that requires a high level of implementation complexity.
  • the AP should be explicitly indicated whether to allocate RUs to STAs through the trigger frame and to respond to the STAs with a Dynamic TB PPDU.
  • the MAC of the AP configures a trigger frame and requests transmission to the PHY, and together with the RU_ALLOCATION_LIST, a parameter of the TRIGVECTOR, whether the Dynamic TB PPDU can be received from each RU DYNAMIC_RU_LIST indicating DYNAMIC_RU_LIST may be transmitted to the PHY.
  • FIG. 24 shows an example of a user information field of a trigger frame according to an embodiment of the present invention.
  • an STA to which an RU is assigned through a trigger frame may recognize whether to allow a dynamic TB PPDU response through a user specific field of the trigger frame.
  • the AP receiving the Dynamic TB PPDU is an operation not supported by the conventional 11ax standard, and may act as a factor to increase the implementation complexity of the AP receiving the UL OFDMA PPDUs. Accordingly, the AP may signal whether the Dynamic TB PPDU response is allowed in response to the trigger frame transmitted by the AP in consideration of its own capability.
  • the AP may indicate whether STAs responding to the TB PPDU are allowed to transmit the Dynamic TB PPDU after receiving the trigger frame by using a specific field of the trigger frame.
  • the AP may use the user information field of the trigger frame.
  • the user information field of the trigger frame includes AID12, RU allocation, Dynamic TB PPDU Response, UL FED Coding Type, UL EHT-MCS, UL DCM, SS Allocation/RA-RU Information, UL Target RSSI, Reserved , it can be composed of the Trigger Dependent User Info subfield.
  • the AID12 field indicates the AID LSB 12-bit of the STA that is allocated an RU through the user information field and should respond to the TB PPDU
  • the RU allocation subfield indicates the size and location of the RU to be used by the STA that needs to respond to the TB PPDU.
  • the RU allocation subfield may be interpreted in combination with the UL_BW included in the common information field of the trigger frame.
  • the user information field of the 11be trigger frame is mostly composed of subfields having the same or similar function as the trigger frame of 11ax, and the RU allocation subfield and the SS allocation/RA-RU information subfield are M-added in 11be. It may be used to indicate multiple RUs (RU) and the number of added antennas (16).
  • the Dynamic TB PPDU Response subfield is a Dynamic TB PPDU using a part of the allocated RUs according to the CCA result of the STA, which is allocated an RU through the corresponding user information field and needs to respond to the TB PPDU.
  • the Dynamic TB PPDU Resp subfield is set to 1
  • a Dynamic TB PPDU response is allowed for the STA that has received the corresponding user information field
  • the subfield is set to 0, the Dynamic TB PPDU response may be prohibited. .
  • the AP may not separately signal whether a response of the Dynamic TB PPDU is allowed to each STA.
  • each STA may recognize that the Dynamic TB PPDU response is permitted and operate only when it is allocated a SU-RU of 40 MHz RU or more through the trigger frame.
  • the AP may indicate whether a Dynamic TB PPDU response is allowed for all STAs through a common information field (of the trigger frame) instead of the user information field of each STA. If the Dynamic TB PPDU response is allowed through the common information field of the trigger frame, if the STA allocated with an RU of 40 MHz or higher has the ability to respond to the Dynamic TB PPDU, the STA configures a Dynamic TB PPDU to configure the trigger frame can respond to
  • the Dynamic TB PPDU is not allowed. If the RU allocated to a specific STA through the trigger frame is less than 20 MHz (242-tone size RU) or is a 20 MHz RU, the STA allocated to the RU may not be able to configure a Dynamic TB PPDU.
  • the STA will perform CCA on a 20 MHz subchannel existing within the 20 MHz RU and determine that the entire 20 MHz RU is IDLE or BUSY. Therefore, the STA allocated to the 20 MHz RU has no basis to dynamically use the allocated RU according to the CCA result.
  • the preamble of the TB PPDU must be configured in units of 20 MHz, so it is impossible to transmit the preamble except for the small RU determined as BUSY. have.
  • STAs allocated to RUs smaller than 20 MHz are also limited in Dynamic TB PPDU transmission for the same reason as STAs allocated to 20 MHz RUs.
  • the TB PPDU transmitted by each STA must be responded with the same preamble and RU configuration. If multiple STAs allocated the same RU respond to Dynamic TB PPDUs transmitted in different RU configurations, the AP receiving the Dynamic TB PPDUs may not be able to distinguish the types of Dynamic TB PPDUs transmitted by each STA. Therefore, when the AP allocates a specific RU to multiple STAs, the Dynamic TB PPDU Resp. By indicating the subfield as 0, it is possible to restrict each STA not to respond to a Dynamic TB PPDU with a different RU configuration.
  • each STA may respond to the Dynamic TB PPDU only when it has confirmed that the RU allocated to it is a single-user (SU) RU allocated only to itself.
  • SU single-user
  • the dynamic TB PPDU response may be restricted to the STAs. This may be due to the limitation that different preambles cannot appear in the 80 MHz segment. If the AP allocates two 40 MHz RUs in the 80 MHz segment to two STAs through a trigger frame, each STA may respond by configuring different preambles in transmitting the Dynamic TB PPDU. In this case, two different preambles may appear in the 80 MHz segment, which may be an operation that violates the principle stipulated in 11be. In this case, the dynamic TB PPDU response restriction related to the preamble rule described above may be limitedly applied to the embodiments related to the preamble configuration of the dynamic TB PPDU among the embodiments of the present invention to be described later.
  • the operation of the STA responding to or receiving the above-described Dynamic TB PPDU may be an operation difficult to implement for an STA having a limited hardware configuration.
  • the information on the configuration may be exchanged between the AP and the STA.
  • the Dynamic TB PPDU field of the EHT-capability element appears as 1, it may mean that the corresponding STA can configure and respond to the Dynamic TB PPDU.
  • 25 shows an example of a method of transmitting a TB PPDU based on a trigger frame according to an embodiment of the present invention.
  • STAs allocated with an RU through a trigger frame may respond through a Dynamic TB PPDU.
  • the operation in which the AP allocates an RU through a trigger frame, and the STA1 and STA2 allocated the RU through the trigger frame perform a Dynamic TB PPDU response is the CCA situation of each STA shown through the embodiment of FIG. 22 . Assuming the same situation as
  • each of the STAs may respond to information on the RU configuration used by the STAs through the U-SIG field of the Dynamic TB PPDU to which they respond.
  • STA1 uses 20+(20)+40 MHz RUs excluding the second 20 MHz subchannel among 80 MHz RUs, which are RUs allocated to it, indicating that Dynamic TB PPDU1 is responded
  • STA2 may indicate that Dynamic TB PPDU2 is answered by using a 20 MHz RU located at the lowest frequency position among RUs allocated to it.
  • the AP decodes at least one preamble appearing in the subchannels of the Dynamic TB PPDUs transmitted by the STA1 and STA2, respectively, the AP is located in the 20+(20)+40 MHz RU in the Low 80 MHz. It can be recognized that TB PPDU1 is received, and Dynamic TB PPDU2 of STA2 is received in Low 20 MHz RUs among RUs existing in High 80 MHz.
  • the expression of some RU types may be limited in consideration of the limited length of the U-SIG field. I have a problem. If the RU allocated to the STA is 320 MHz, and a Dynamic TB PPDU can be configured by freely using the 320 MHz allocated to the STA in units of 20 MHz RUs, the STA allocated to the 320 MHz RU can configure the Dynamic 16 bits must be allocated to accurately represent the shape of the TB PPDU. However, since the U-SIG includes a version independent field and must include a spatial reuse field and a puncturing mode field for OBSS, 16 bits are used to indicate the shape of the Dynamic Tb PPDU as described above. It is impossible to dedicate
  • the size of the RU type-related field that can be utilized to indicate the type of the Dynamic TB PPDU may be limited, and may have a configuration that excludes signaling for a specific RU combination.
  • Dynamic TB PPDU type can be expressed.
  • FIG. 26 shows an example of a format of a U-SIG field of a TB PPDU according to an embodiment of the present invention.
  • the format of the U-SIG field of the TB PPDU shown in FIG. 26 may be based on the assumption that the U-SIG of the TB PPDU may appear as a different value for each 80 MHz segment.
  • the U-SIG of the TB PPDU may include version independent fields.
  • the version independent fields may be fields commonly included in the next-generation WiFi PPDU regardless of the PHY protocol version and PPDU type, as described through the embodiment of FIG. 8 .
  • the spatial reuse 1 and 2 fields shown in the U-SIG of the TB PPDU may indicate a spatial reuse value to be applied to an 80 MHz segment in which the TB PPDU is transmitted.
  • puncturing modes 1 and 2 may appear in the TB PPDU U-SIG, and puncturing mode 1 is a field in which the UL_Puncturing mode field value delivered to each STA through the common information field of the trigger frame is copied/moved as it is.
  • the UL_Punturing mode field may be a value of the puncturing mode indicated by predicting the shape of the UL OFDMA PPDU to be received by the AP as a response to the trigger frame in the process of generating the trigger frame. That is, the puncturing mode 1 field does not aim to provide information necessary for the AP to receive the Dynamic TB PPDU, but may be information provided to help the operation of other devices similar to the space reuse field. Accordingly, the puncturing mode 1 field may be a field that appears with the same value in all (dynamic) TB PPDUs that are responded through the trigger frame.
  • the puncturing mode 2 field is a field indicating the type of RU used by the STA that responds to the Dynamic TB PPDU to configure the Dynamic TB PPDU, so that different STAs transmit (in different 80 MHz segments).
  • the puncturing mode 2 field of the TB PPDU U-SIG may have different values. An embodiment of signaling using the puncturing mode 2 field will be described with reference to FIG. 28 to be described later.
  • the segment location field indicates which segment the TB PPDU including the detected preamble is located in the operating band (operating BW) of the AP receiving the TB PPDU when the OBSS device detects the preamble of the TB PPDU in a specific segment. serves to provide information.
  • An embodiment of signaling using the segment location field will be described with reference to an embodiment of FIG. 28 to be described later.
  • a combination of RUs that an STA allocated with an RU through a trigger frame can utilize for configuring a dynamic TB PPDU may be limited to a specific form in consideration of implementation complexity and efficiency.
  • RUs that can be assigned to a single STA through a trigger frame are Small RUs (26, 52, 78, 106, 132-tone size RUs) and 20, 40, 60, 80, 120, 160 MHz RUs (each 242, 484, 996, 484+996, 996x2 -tone size RU).
  • 100 MHz RU (996+242-tone size RU) and 140 MHz RU (242+484+996-tone size RU) do not have large gains compared to 80 MHz RU and 120 MHZ RU, respectively. can be excluded.
  • the type of RU allocated to a single STA through the trigger frame of the 240/320 MHz PPDU may be limited for the same reason as described above.
  • the restricted type of RU may be Mandatory Multiple-RU.
  • the configured Dynamic TB PPDU when a single STA configures a Dynamic TB PPDU by utilizing some of the RUs allocated to it, the configured Dynamic TB PPDU may be limited to have a limited form, and the dynamic TB PPDU of the limited form may be restricted.
  • the TB PPDU may be signaled as a bitmap of 4-bit size.
  • FIG. 27 shows an example of a configuration and signaling of a resource unit for transmission of a TB PPDU according to an embodiment of the present invention.
  • the STA is allocated a 160 MHz RU through a trigger frame, and the AP that has generated and transmitted the trigger frame can already know the size and location of the RU allocated to the STA.
  • the Puncturing mode2 may be set to 0011 or 1100, and the STA may configure and UL transmit a Dynamic TB PPDU by using only 80 MHz RUs.
  • the minimum size of an RU that the STA can represent using the puncturing mode 2 field It can be seen that is 1/4 of the size of the RU allocated to it. Therefore, as in this embodiment, when the STA is allocated a 160 MHz RU and only one of 8 subchannels included in the RU is determined as IDLE, the STA must give up UL transmission using the Dynamic TB PPDU. can do.
  • FIG. 28 shows an example of signaling of a puncturing mode and a segment position through a TB PPDU according to an embodiment of the present invention.
  • an STA may be allocated an RU through a trigger frame transmitted through a 160 MHz band, and both STAs are triggered through a Dynamic TB PPDU of a U-SIG field including a puncturing mode and a segment location field.
  • a response to the frame may be transmitted.
  • STA1 is allocated an 80 MHz RU corresponding to Segment 1 located at a lower frequency through a trigger frame
  • STA2 is 20+(20)+40 included in Segment 2 located at a higher frequency through the trigger frame.
  • MHz RU has been allocated.
  • Each of STA1 and STA2 can configure and UL transmit Dynamic TB PPDUs 1 and 2 by using 20+(20)+40 MHz RU and 20 MHz RU, respectively, according to CCA results and RU type restrictions.
  • the puncturing mode 1 field included in the U-SIG field of the Dynamic TB PPDU transmitted by STA1 and STA2 respectively has the same value, whereas the puncturing mode 2 field and the segment location field have different values for the two Dynamic TB PPDUs. It can be set to a value.
  • the puncturing mode 1 field included in the dynamic TB PPDU is a value indicated through the common information field of the trigger frame, and as described above, indicates the type information of the UL OFDMA PPDU expected to be responded through the trigger frame. Therefore, the puncturing mode 1 field appears with the same value in all TB PPDUs responded through a single trigger frame.
  • the configuration of the puncturing mode 2 field may be signaled with different values in order to indicate the type of RU that each STA utilizes, as described above with reference to the embodiment of FIG. 27 . Therefore, STA1 signals by setting the puncturing mode 2 field to 1011 to indicate that its Dynamic TB PPDU1 is configured using 20+(20)+40 MHz RU located in Segment1, and STA2 indicates that the Dynamic TB PPDU2
  • the puncturing mode 2 field is signaled as 1000 to indicate that the RU allocated to it is configured using 20 MHz located at the lowest frequency of Segment 2 in which it is present.
  • each STA may indicate information on which segment of the BW in which the TB PPDUs transmitted by the STA are located in which TB PPDUs responded with UL OFDMA are located using the segment location field.
  • the segment location field may be provided so that STAs that have detected a preamble of a specific TB PPDU can check information on a frequency domain in which TB PPDUs transmitted together with the TB PPDU appear.
  • the segment location field may be interpreted together with the BW field, which is another field included in the TB PPDU U-SIG.
  • the STA determines that the BW of the TB PPDU is 160 MHz and the segment location field is 00 in the preamble detected by the STA
  • the TB PPDU detected by the STA or TB PPDUs responded with the detected TB PPDU It is transmitted over 160 MHz BW, and it can be confirmed that the detected position of the TB PPDU is 80 MHz located at the lower frequency.
  • An embodiment of the present invention considers the 2-bit embodiment of the segment location field, and therefore, the four segments included in the maximum 320 MHz PPDU are expressed as 00, 01, 10, and 11, respectively, starting from the segment located at the lower frequency.
  • a specific STA is allocated an RU over two segments, the specific STA sets the segment location field included in the U-SIG field of the TB PPDU according to each segment location to a different value. (Example: 00, 01).
  • the STA that responds to the Dynamic TB PPDU does not configure the TB PPDU U-SIG by using the values shown in the trigger frame requesting the Dynamic TB PPDU, but determines the CCA result and RU configuration performed by itself After performing , there is a procedure to configure the U-SIG field.
  • the operation of the STA responding to the Dynamic TB PPDU may be more complicated compared to the operation of the STA responding to the 11ax TB PPDU. It can be difficult to respond.
  • the AP may indicate that the response of the TB PPDU may be started at a time other than after SIFS. For example, when the AP indicates the Delayed response field as 1 through the common Info field of the trigger frame, the STAs that have received the trigger frame may respond with a TB PPDU after PIFS rather than SIFS.
  • Dynamic TB PPDU1 and 2 received in response to the trigger frame may have different U-SIG field configurations. At least one subchannel in which TB PPDU1 and 2 appears must be decoded.
  • the AP cannot know which subchannel is excluded from each Dynamic TB PPDU response process among subchannels included in the RUs allocated by the AP to each STA. Therefore, the operation of decoding at least one subchannel in which each Dynamic TB PPDU appears may be very difficult for the AP side implementation, and to alleviate this problem, the subchannel that must be occupied when responding to the Dynamic TB PPDU is preset it may have to be
  • 29 shows an example of setting and using a subchannel for TB PPDH transmission according to an embodiment of the present invention.
  • the AP allocates 80 MHz RUs located in each segment to STAs 1 to 4 one by one through a 320 MHz trigger frame, and considers a situation in which a dynamic TB PPDU response is allowed to each STA.
  • the AP may indicate to each STA the subchannel that should be occupied when responding to the Dynamic TB PPDU. For example, in FIG. 29, the AP instructs STA1 to occupy the 3rd subchannel and STA2 to 3 respectively, the 1st subchannel, and each STA is a Among the four subchannels, a Dynamic TB PPDU must be responded to by obligingly occupying the subchannel indicated by the AP.
  • the AP receives at least one preamble of the Dynamic TB PPDUs that are simultaneously responded. Operation of receiving at least one It can relieve a lot of burden in carrying out
  • the mandatory subchannel of the primary 80 MHz segment may be fixed to the P20 channel. That is, when the STA allocated with the RU including the primary 20 MHz subchannel configures the dynamic TB PPDU, the configuration of the dynamic TB PPDU not including the primary 20 MHz may be restricted.
  • the AP reduces the burden on reception of the preamble by setting the Mandatory subchannel as described above according to its capabilities, or by limiting the number of STAs that allow the Dynamic TB PPDU to be within the range that it can support. may allow the Dynamic TB PPDU to be answered.
  • Dynamic TB PPDU-related embodiments are the TB PPDU format and STA (AP and non-AP) for the invention in which the AP obtains information necessary for receiving the Dynamic TB PPDU by decoding the preamble of the TB PPDU UL transmitted by each STA. ) describes the operation.
  • Another implementation method of the present invention provides a method for the AP to determine the RU configuration of the Dynamic TB PPDU transmitted by each STA by itself.
  • the AP confirms the appearance of the TB PPDU received in response to the trigger frame transmitted by the AP, based on the strength of the received signal, and RU information allocated to each STA. By comparing with , it is possible to determine the RU configuration of the Dynamic TB PPDU UL transmitted by each STA.
  • TB PPDUs that are predicted to be received based on the information of the trigger frame generated by the AP It is possible to calculate the reception time and BW of In addition, location information in which the TB PPDU transmitted by each STA UL in the TB PPDUs that are expected to be received can be known in advance.
  • the AP knows the RU location of the TB PPDU to be transmitted by each STA as described above, when the TB PPDU is received in response to the trigger frame, by trying to detect a signal in the subchannels where the TB PPDU is expected to appear. It is possible to check whether the predicted TB PPDU appears or whether some subchannels are not utilized, and by confirming that the RU allocated to a specific STA is not utilized, the unused RU is excluded from the TB PPDU configuration can be perceived As a simple example, after the AP allocates an 80 MHz RU to a specific STA through a trigger frame, it may be predicted that an 80 MHz TB PPDU will be responded to the trigger frame.
  • signal detection may be performed on four subchannels existing in an 80 MHz RU to which the TB PPDU is expected to be responded, and if the signal is detected in only three subchannels as a result of the signal detection, the signal is detected It can be confirmed that the remaining one subchannel, not the three subchannels, is a subchannel excluded in the process of configuring the Dynamic TB PPDU by the STA.
  • the STAs that respond to the Dynamic TB PPDU after receiving the trigger frame receive information related to the RU configuration of the Dynamic TB PPDU they transmit. does not need to be separately provided to the AP.
  • the AP determines that decoding is impossible among the TB PPDUs UL transmitted by each STA based on the signal detection result for the received TB PPDU.
  • the advantage is that further processing can be stopped.
  • FIG. 30 illustrates an example of signal detection for a TB PPDU in response to a trigger frame according to an embodiment of the present invention.
  • the AP allocated 80 MHz RU of Segment 1 and 20+(20)+40 MHz RU of Segment 2 to STA1 and STA2 through a 160 MHz trigger frame, respectively (Dynamic TB PPDU response) allow), STA1 and STA2 that have received the trigger frame respond with Dynamic TB PPDUs 1 and 2, respectively.
  • the AP may attempt signal detection to determine the RU configuration in which the Dynamic TB PPDUs are received.
  • the signal detection method performed by the AP may be an operation similar to per 20 MHz CCA.
  • the AP may utilize information on the timing at which the TB PPDU is received as well as the BW of the TB PPDU that is expected to be received.
  • STAs assigned an RU through a trigger frame must respond to a TB PPDU by using the assigned RU after SIFS.
  • SIFS time regulation for this TB PPDU response
  • the TB PPDU will be received after a specific time (eg, SIFS (+ propagation delay)) from the transmission end time of the trigger frame. predictable.
  • the AP may specify the range (frequency and time) of the signal detection operation by utilizing the predicted BW information and the predicted reception timing information of the TB PPDUs that are expected to be received. In this case, the AP may attempt to detect a signal for a part of a time period in which the preamble of TB PPDUs is predicted to be detected, based on the time information when the reception is predicted.
  • 30B shows an example of a detection result obtainable when the AP performs signal detection for a TB PPDU.
  • STA1 utilizes 20+(20)+40 MHz RU and STA2 responds with Dynamic TB PPDU1, 2 using 20 MHz RU
  • the result of signal detection performed by the AP A high signal level will be measured on a subchannel used by each STA when configuring a Dynamic TB PPDU, and a low signal level will be measured on a subchannel not used for Dynamic TB PPDU transmission.
  • the AP may determine whether the reception of the TB PPDU has started in each subchannel in consideration of the strength of signals detected in each subchannel. As a simple example, as shown in FIG. 30B , the AP may complete the above-described signal detection based on whether a signal detected in each subchannel exceeds a specific threshold value. At this time, since the signal detection performed by the AP can be performed according to the timing at which the preamble of the TB PPDU is received, unlike a typical per 20 MHz CCA, it is performed in a PD (preamble detection) method or ED (energy detection) is performed, but This may be performed by utilizing a value different from the ED threshold for general PIFS-based channel access.
  • PD preamble detection
  • ED energy detection
  • the RU configuration of the Dynamic TB PPDU transmitted by each STA can be predicted. .
  • the AP may determine that the TB PPDU is indicated as 1011 in Segment 1 and is being received as 1000 in Segment 2 .
  • the AP uses 20+(20)+40 MHz RUs except for one subchannel among the 80 MHz RUs allocated to the STA1. It can be recognized that the Dynamic TB PPDU is being responded.
  • the determination of the dynamic TB PPDU type of STA2 may be performed in the same manner as the above-described process of identifying the dynamic TB PPDU of STA1.
  • the PHY of the AP may receive the RU_ALLOCATION_LIST and DYNAMIC_RU_LIST parameters through the TRIGVECTOR. Thereafter, the PHY attempts to detect the signal of the TB PPDU according to the time at which the TB PPDU is expected to be responded, and determines whether the TB PPDU is being received in each subchannel. In this case, the signal detection may be limitedly performed only for a subchannel in which the Dynamic TB PPDU can be received based on the information of the DYNAMIC_RU_LIST parameter.
  • the AP's PHY can modify the RU configuration of the STA identified through the RU_ALLOCATION_LIST parameter.
  • the PHY may properly separate and decode the TB PPDU of each STA.
  • the AP may independently receive the Dynamic TB PPDU responded to by each STA without additional signaling using the TB PPDU U-SIG.
  • the signal detection method as shown in FIG. 30B may be somewhat inaccurate, which may cause the AP to erroneously determine the subchannel through which the TB PPDU is being received. Therefore, in order to increase the accuracy of the above-described signal detection, a signal detection method that adaptively adjusts and applies a threshold value may be required.
  • 31 shows an example of applying a different threshold value to a region where reception is expected in a signal detection process for a TB PPDU according to an embodiment of the present invention.
  • different threshold values may be applied to regions in which TB PPDUs of different STAs are expected to be received.
  • the AP may perform signal detection by applying different threshold values to RUs allocated to different STAs. After the AP transmits the trigger frame, a situation in which the TB PPDU1 of STA1 is predicted to be responded to Segment1 and the TB PPDU2 of STA2 is predicted to be responded to Segment2 may be assumed. At this time, the AP applies a threshold value -x dBm to the four subchannels in which TB PPDU1 is predicted to be received, checks whether TB PPDU1 appears, and for the four subchannels in which TB PPDU2 is predicted to be received - y dBm can be applied as a threshold value.
  • each STA that has received the trigger frame may have a different distance from the AP, and the UL indicated by the AP through the User Info field of the trigger frame. This is because the target RSSI values may be different.
  • the signal received at -40 dBm may not be a signal detected from the TB PPDU to which the STA1 responds.
  • the signal detection result using the threshold value of -40 dBm may ignore the TB PPDU signal to which the STA2 responds.
  • the AP may apply different threshold values to detecting the TB PPDU to which each STA responds in consideration of the target RSSI value indicated to each STA.
  • the MAC of the AP may have to deliver the RU (subchannel) _(target)RSSI_LIST to the TRIGVECTOR delivered to the PHY.
  • signal detection for the TB PPDUs that are responded to may be performed using different target RSSI values.
  • the signal detection result for some of the subchannels may be identified differently from the actual TB PPDU reception form.
  • the AP determines whether a TB PPDU appears based on a threshold value in the process of performing signal detection, and at the same time, the TB PPDU of each STA responds It can be further checked whether a signal having a constant strength is received in the subchannels that are predicted to be.
  • the strength of the signal emitted by the PPDU to each subchannel is constant (eg, Maximum deviation + - 4 dB) is recommended, so if there is a subchannel whose signal strength is different from that of another subchannel among the signals identified in each subchannel, the signal detected in the subchannel is different from that of another device. It can be determined that it has been received from In this case, a method of detecting a signal received from another device by comparing the signal strength may be referred to as a signal detection error method using the flatness of the signal.
  • 32 illustrates an example of an error correction method for signal detection according to an embodiment of the present invention.
  • the AP performs signal detection to confirm the RU configuration of the dynamic TB PPDU of STA1 and STA2, and utilizes different threshold values for subchannels from which the TB PPDU of each STA is predicted to be received. have.
  • a non-TB PPDU signal exceeding the threshold value (-y dBm) set by the AP to detect the TB PPDU of STA2 may be detected.
  • the AP's PHY can confirm that, among the signals detected in Segment 2, the strength of the signal confirmed in the first (leftmost in the drawing) subchannel and the signal confirmed in the remaining 2nd, 3rd, and 4th subchannels are different. and, based on this, it can be determined that signals detected in the first subchannel and the remaining subchannels are different signals.
  • the AP decodes each of the two to determine whether the Dynamic TB PPDU UL transmitted by STA2 is a 20 MHz TB PPDU shown in the first subchannel or a 20+40 MHz TB PPDU using the remaining three subchannels. you can try
  • the AP can utilize signal detection to determine the RU configuration of the Dynamic TB PPDU transmitted by each STA, and can control errors that may occur in the signal detection process by adaptive threshold adjustment and This can be solved through an error detection technique using the flatness of the WiFi signal.
  • FIG 33 is a flowchart illustrating an example of a method for a non-AP STA to transmit a response frame to a trigger frame according to an embodiment of the present invention.
  • the non-AP STA may respond by generating a TB PPDU according to the type and format of the responding TB PPDU.
  • the non-AP STA may receive a trigger frame instructing transmission of the TB PPDU from the AP (S33010).
  • the trigger frame may include a common information field including a plurality of first spatial reuse fields.
  • the trigger frame may additionally include an additional information field including a plurality of second spatial reuse fields, and whether the trigger frame includes the additional information field is identified based on identification information of the trigger frame.
  • whether the trigger frame includes a plurality of second spatial reuse fields may be identified according to identification information included in the trigger frame.
  • the trigger frame may include a first plurality of spatial reuse fields (spatial reuse fields 1 to 4) in the common information field, and identification information (eg, a specific field of the common information field)
  • the trigger frame is an additional information field including a second plurality of spatial reuse fields (space reuse fields 5 to 8).
  • the configuration of the trigger frame may be the same as the trigger format described with reference to FIGS. 9 and 11 .
  • the trigger frame may include at least one of a common information field, an additional information field, and a user information field, and the configuration of the additional information field and/or the user information field may vary depending on the type and/or format of the trigger frame. have.
  • the user information field for each non-AP STA may be in the EHT format or the HE format according to the format of the TB PPDU indicated by the trigger frame.
  • the location of the RU for transmission of the TB PPDU in response to the trigger frame is the upper frequency band (or Primary BW), or the TB PPDU is the HE TB PPDU. In this case, it may be used for generation of the HE TB PPDU. That is, the first plurality of spatial reuse fields may be encoded in the spatial reuse fields of the TB PPDU.
  • the location of the RU for transmission of the TB PPDU in response to the trigger frame is in a lower frequency band (or Primary BW or Secondary BW). ), or when the TB PPDU is an EHT TB PPDU, it may be used for generation of the EHT TB PPDU. That is, the second plurality of spatial reuse fields may be encoded in the spatial reuse fields of the TB PPDU.
  • a plurality of first spatial reuse fields or a plurality of second spatial reuse fields may be used to generate a TB PPDU that is a response frame according to a format related to the trigger frame (eg, the format of the user information field).
  • the TB PPDU when the format related to the trigger frame is the HE format (eg, the format of the user information field is the HE format), the TB PPDU, which is the response frame, uses a first plurality of spatial reuse fields to form the HE TB PPDU. is created with However, when the format related to the trigger frame is the EHT format (eg, when the format of the user information field is the EHT format), the TB PPDU, which is the response frame, uses a second plurality of spatial reuse fields to generate an EHT TB PPDU. do.
  • the non-AP STA may generate a response frame based on information obtained from the first plurality of spatial reuse fields or the second plurality of spatial reuse fields (S33020).
  • the non-AP STA may determine the format of the response frame for the trigger frame, and may generate a TB PPDU, which is the response frame, according to the determined format.
  • the TB PPDU which is the response frame
  • the TB PPDU may be generated based on information obtained from the first plurality of spatial reuse fields or the second plurality of spatial reuse fields.
  • Whether the response frame is generated based on the first plurality of spatial reuse fields or the second plurality of spatial reuse fields may be determined based on a format related to the trigger frame. For example, when the format of the user information field of the trigger frame is the HE format, the format of the TB PPDU is determined as the HE TB PPDU and may be generated based on the first plurality of spatial reuse fields. That is, the response frame may be generated based on information obtained from the first plurality of spatial reuse fields or the second plurality of spatial reuse fields.
  • the first plurality of spatial reuse fields or the second plurality of spatial reuse fields for generation of the TB PPDU may also be selected according to the location of the RU allocated for transmission of the TB PPDU indicated by the trigger frame. That is, if the location of the RU is in the upper frequency band (or Priamry BW), the TB PPDU is generated based on the first plurality of spatial reuse fields, and if the location of the RU is in the lower frequency band (or Secondary BW), TB The PPDU may be generated based on the second plurality of spatial reuse fields.
  • the non-AP STA may transmit a response frame generated based on information obtained from the first plurality of spatial reuse fields or the second plurality of spatial reuse fields in response to the trigger frame (S34030). Whether the response frame is generated based on the first plurality of spatial reuse fields or the second plurality of spatial reuse fields may be determined based on a format related to the trigger frame.
  • a response frame is generated based on information obtained from the plurality of second spatial reuse fields.
  • EHT Extremely High Throughput
  • a response frame is generated based on information obtained from the first plurality of spatial reuse fields.
  • HE high efficiency
  • whether the response frame is generated based on information obtained from the first plurality of spatial reuse fields or generated based on information obtained from the second plurality of spatial reuse fields is a resource unit in which the response frame is transmitted. may be determined based on the position on the frequency axis of
  • the trigger frame includes a bandwidth field, an additional bandwidth field, a resource allocation field indicating a resource unit to which the response frame is transmitted, and a trigger frame whether puncturing is performed in the bandwidth indicated by the bandwidth field and/or the additional bandwidth field and puncturing. It may include at least one of the puncturing mode fields indicating the punctured position.
  • the non-AP STA may recognize the resource unit to which the response frame is transmitted based on the resource allocation field included in the trigger frame, and the first plurality of STAs according to the location on the frequency axis of the resource unit to which the response frame is transmitted.
  • a response frame may be generated based on information obtained from the spatial reuse fields or the second plurality of spatial reuse fields.
  • the response frame is transmitted through a bandwidth indicated by a bandwidth field included in the common information field and an additional bandwidth field included in the additional information field.
  • the response frame includes a plurality of spatial reuse fields, and each of the plurality of spatial reuse fields may be set based on information obtained from each of the corresponding first plurality of spatial reuse fields or the second plurality of spatial reuse fields. have.
  • Whether the trigger frame includes the additional information field is set to a specific value by a value of a specific subfield indicating whether the additional information field is included in the common information field and/or an identifier value of the additional information field It can be recognized depending on whether or not
  • the response frame may be transmitted in the form of a TB PPDU as described above, and the TB PPDU is combined with at least one TB PPDU transmitted from at least one other non-ATP STA in which transmission of the TB PPDU is indicated by the trigger frame. to be transmitted in the form of an aggregated A (A)-PPDU.
  • A aggregated A
  • at least one TB PPDU is generated based on the first plurality of spatial reuse fields or the second plurality of spatial reuse fields, and the TB PPDU and the at least one TB PPDU have different spatial reuse fields. is created based on
  • 34 is a flowchart illustrating an example of a method for an AP STA to receive a response frame to a trigger frame according to an embodiment of the present invention.
  • the AP may transmit a trigger frame indicating transmission of the TB PPDU, and in response thereto, may receive the TB PPDU from at least one non-AP STA.
  • the TB PPDUs may be aggregated and transmitted in the form of an A-PPDU.
  • the TB PPDUs may be in different formats (eg, HE TB PPDU, EHT TB PPDU, etc.).
  • the AP may generate and transmit a trigger frame indicating transmission of the TB PPDU (S34010).
  • the trigger frame may include a common information field including a plurality of first spatial reuse fields.
  • the trigger frame may additionally include an additional information field including a plurality of second spatial reuse fields, and whether the trigger frame includes the additional information field is identified based on identification information of the trigger frame.
  • whether the trigger frame includes a plurality of second spatial reuse fields may be identified according to identification information included in the trigger frame.
  • the trigger frame may include a first plurality of spatial reuse fields (spatial reuse fields 1 to 4) in the common information field, and identification information (eg, a specific field of the common information field)
  • the trigger frame includes an additional information field including a second plurality of spatial reuse fields (space reuse fields 5 to 8).
  • the configuration of the trigger frame may be the same as the trigger format described with reference to FIGS. 9 and 11 .
  • the trigger frame may include at least one of a common information field, an additional information field, and a user information field, and the configuration of the additional information field and/or the user information field may vary depending on the type and/or format of the trigger frame. have.
  • the user information field for each non-AP STA may be in the EHT format or the HE format according to the format of the TB PPDU indicated by the trigger frame.
  • the location of the RU for transmission of the TB PPDU in response to the trigger frame is the upper frequency band (or Primary BW), or the TB PPDU is the HE TB PPDU. In this case, it may be used for generation of the HE TB PPDU. That is, the first plurality of spatial reuse fields may be encoded in the spatial reuse fields of the TB PPDU.
  • the location of the RU for transmission of the TB PPDU in response to the trigger frame is in a lower frequency band (or Primary BW or Secondary BW). ), or when the TB PPDU is an EHT TB PPDU, it may be used for generation of the EHT TB PPDU. That is, the second plurality of spatial reuse fields may be encoded in the spatial reuse fields of the TB PPDU.
  • a plurality of first spatial reuse fields or a plurality of second spatial reuse fields may be used to generate a TB PPDU that is a response frame according to a format related to the trigger frame (eg, the format of the user information field).
  • the TB PPDU when the format related to the trigger frame is the HE format (eg, the format of the user information field is the HE format), the TB PPDU, which is the response frame, uses a first plurality of spatial reuse fields to form the HE TB PPDU. is created with However, when the format related to the trigger frame is the EHT format (eg, when the format of the user information field is the EHT format), the TB PPDU, which is the response frame, uses a second plurality of spatial reuse fields to generate an EHT TB PPDU. do.
  • the AP may receive at least one response frame (TB PPDU) from at least one non-AP STA in response to the trigger frame (S34020).
  • the TB PPDU may be generated based on information obtained from the first plurality of spatial reuse fields or the second plurality of spatial reuse fields.
  • the TB PPDU which is a response frame, may be generated based on information obtained from the first plurality of spatial reuse fields or the second plurality of spatial reuse fields. Whether the response frame is generated based on the first plurality of spatial reuse fields or the second plurality of spatial reuse fields may be determined based on a format related to the trigger frame. For example, when the format of the user information field of the trigger frame is the HE format, the format of the TB PPDU is determined as the HE TB PPDU and may be generated based on the first plurality of spatial reuse fields. That is, the response frame may be generated based on information obtained from the first plurality of spatial reuse fields or the second plurality of spatial reuse fields.
  • the first plurality of spatial reuse fields or the second plurality of spatial reuse fields for generation of the TB PPDU may also be selected according to the location of the RU allocated for transmission of the TB PPDU indicated by the trigger frame. That is, if the location of the RU is in the upper frequency band (or Priamry BW), the TB PPDU is generated based on the first plurality of spatial reuse fields, and if the location of the RU is in the lower frequency band (or Secondary BW), TB The PPDU may be generated based on the second plurality of spatial reuse fields.
  • Whether the response frame is generated based on the first plurality of spatial reuse fields or the second plurality of spatial reuse fields may be determined based on a format related to the trigger frame.
  • a response frame is generated based on information obtained from the plurality of second spatial reuse fields.
  • EHT Extremely High Throughput
  • a response frame is generated based on information obtained from the first plurality of spatial reuse fields. That is, the response frame may be generated based on information obtained from the first plurality of spatial reuse fields or the second plurality of spatial reuse fields.
  • HE high efficiency
  • the first plurality of spatial reuse fields or the second plurality of spatial reuse fields for generation of the TB PPDU may also be selected according to the location of the RU allocated for transmission of the TB PPDU indicated by the trigger frame. That is, if the location of the RU is in the upper frequency band (or Priamry BW), the TB PPDU is generated based on the first plurality of spatial reuse fields, and if the location of the RU is in the lower frequency band (or Secondary BW), TB The PPDU may be generated based on the second plurality of spatial reuse fields.
  • a response frame is generated based on information obtained from the plurality of second spatial reuse fields.
  • EHT Extremely High Throughput
  • a response frame is generated based on information obtained from the first plurality of spatial reuse fields.
  • HE high efficiency
  • whether the response frame is generated based on information obtained from the first plurality of spatial reuse fields or generated based on information obtained from the second plurality of spatial reuse fields is a resource unit in which the response frame is transmitted. may be determined based on the position on the frequency axis of
  • the trigger frame includes a bandwidth field, an additional bandwidth field, a resource allocation field indicating a resource unit to which the response frame is transmitted, and a trigger frame whether puncturing is performed in the bandwidth indicated by the bandwidth field and/or the additional bandwidth field and puncturing. It may include at least one of the puncturing mode fields indicating the punctured position.
  • the non-AP STA may recognize the resource unit to which the response frame is transmitted based on the resource allocation field included in the trigger frame, and the first plurality of STAs according to the location on the frequency axis of the resource unit to which the response frame is transmitted.
  • a response frame may be generated based on information obtained from the spatial reuse fields or the second plurality of spatial reuse fields.
  • the response frame is transmitted through a bandwidth indicated by a bandwidth field included in the common information field and an additional bandwidth field included in the additional information field.
  • the response frame includes a plurality of spatial reuse fields, and each of the plurality of spatial reuse fields may be set based on information obtained from each of the corresponding first plurality of spatial reuse fields or the second plurality of spatial reuse fields. have.
  • Whether the trigger frame includes the additional information field is set to a specific value by a value of a specific subfield indicating whether the additional information field is included in the common information field and/or an identifier value of the additional information field It can be recognized depending on whether or not
  • the response frame may be transmitted in the form of a TB PPDU as described above, and the TB PPDU is combined with at least one TB PPDU transmitted from at least one other non-ATP STA in which transmission of the TB PPDU is indicated by the trigger frame. and may be received in the form of an aggregated A (A)-PPDU.
  • A aggregated A
  • at least one TB PPDU is generated based on the first plurality of spatial reuse fields or the second plurality of spatial reuse fields, and the TB PPDU and the at least one TB PPDU have different spatial reuse fields. is created based on

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PCT/KR2021/003186 2020-03-14 2021-03-15 무선 통신 시스템에서 데이터를 송수신하기 위한 방법 및 무선 통신 단말 Ceased WO2021187844A1 (ko)

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CN202180021148.1A CN115336217B (zh) 2020-03-14 2021-03-15 无线通信系统中发送或接收数据的无线通信终端以及方法
KR1020227032674A KR20220154699A (ko) 2020-03-14 2021-03-15 무선 통신 시스템에서 데이터를 송수신하기 위한 방법 및 무선 통신 단말
US17/911,635 US20230130569A1 (en) 2020-03-14 2021-03-15 Wireless communication terminal and method for transmitting or receiving data in wireless communication system
CN202411971212.4A CN119921923A (zh) 2020-03-14 2021-03-15 无线通信系统中发送或接收数据的无线通信终端以及方法
CN202411971111.7A CN119892316A (zh) 2020-03-14 2021-03-15 无线通信系统中发送或接收数据的无线通信终端以及方法
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