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EP-4742579-A1 - METHOD AND APPARATUS FOR TRANSMITTING PPDU BY ACCESSING NON-PRIMARY CHANNEL IN WIRELESS LAN SYSTEM

EP4742579A1EP 4742579 A1EP4742579 A1EP 4742579A1EP-4742579-A1

Abstract

Proposed are a method and an apparatus for transmitting a PPDU by accessing a non-primary channel in a wireless LAN system. Specifically, a receiving STA performs backoff on a first non-primary channel. The receiving STA performs channel access for a second non-primary channel if the value of the backoff for the first non-primary channel is zero. The receiving STA transmits the PPDU to a transmitting STA through an idle channel from among the first and second non-primary channels. The first non-primary channel is a secondary 20 MHz channel capable of performing the backoff while a NAV is set in a primary 20 MHz channel. The second non-primary channel is a secondary channel other than the first non-primary channel in a BSS operating channel.

Inventors

  • CHA, Dongju
  • JANG, Insun
  • CHOI, JINSOO
  • BAEK, Sunhee
  • KIM, Geonhwan
  • YOON, Yelin

Assignees

  • LG Electronics Inc.

Dates

Publication Date
20260513
Application Date
20240822

Claims (20)

  1. A method in a wireless local area network (WLAN) system, the method comprising: performing, by a receiving station (STA), back-off for a first non-primary channel; performing, by the receiving STA, channel access for a second non-primary channel based on a back-off value for the first non-primary channel being 0; and transmitting, by the receiving STA, a physical layer protocol data unit (PPDU) to a transmitting STA through an IDLE channel among the first and second non-primary channels, wherein the first non-primary channel is a secondary 20MHz channel capable of performing the back-off while a network allocation vector (NAV) is set in a primary 20MHz channel, wherein the second non-primary channel is a remaining secondary channel in a basic service set (BSS) operating channel excluding the first non-primary channel, and wherein a configuration of the first and second non-primary channels is determined based on a size of the BSS operating channel and a location of the first non-primary channel.
  2. The method of claim 1, wherein based on the size of the BSS operating channel being 160MHz, the second non-primary channel includes a non-primary channel access (NPCA) 20MHz channel, an NPCA 40MHz channel and an NPCA 80MHz channel, the NPCA 20MHz channel is a channel to configure a 40MHz channel capable of transmitting the PPDU together with the first non-primary channel, the NPCA 40MHz channel is a channel to configure an 80MHz channel capable of transmitting the PPDU together with the 40MHz channel, and the NPCA 80MHz channel is a channel to configure a 160MHz channel capable of transmitting the PPDU together with the 80MHz channel.
  3. The method of claim 2, wherein the first non-primary channel is located in a 20MHz channel with the second lowest frequency among the BSS operating channels, wherein the primary 20MHz channel is located in a 20MHz channel with the lowest frequency among the BSS operating channels, wherein based on only the first non-primary channel being IDLE, the PPDU is transmitted through the first non-primary channel, wherein based on the first non-primary channel and the NPCA 40MHz channel being IDLE, the PPDU is transmitted through the 80MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 80MHz channel is punctured, and wherein based on the first non-primary channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, the PPDU is transmitted through the 160MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 160MHz channel is punctured.
  4. The method of claim 2, wherein the first non-primary channel is located in a 20MHz channel with the third lowest frequency among the BSS operating channel, wherein the primary 20MHz channel is located in a 20MHz channel with the lowest frequency among the BSS operating channel, wherein based on only the first non-primary channel being IDLE, the PPDU is transmitted through the first non-primary channel, wherein based on the first non-primary channel and the NPCA 20MHz channel being IDLE, the PPDU is transmitted through the 40MHz channel, wherein based on the first non-primary channel, the NPCA 20MHz channel and the NPCA 40MHz channel being IDLE, the PPDU is transmitted through the 80MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 80MHz channel is punctured, and wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, the PPDU is transmitted through the 160MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 160MHz channel is punctured.
  5. The method of claim 2, wherein the first non-primary channel is located in a 20MHz channel with the fifth lowest frequency among the BSS operating channels, wherein the primary 20MHz channel is located in a 20MHz channel with the lowest frequency among the BSS operating channels, wherein based on only the first non-primary channel being IDLE, the PPDU is transmitted through the first non-primary channel, wherein based on the first non-primary channel and the NPCA 20MHz channel being IDLE, the PPDU is transmitted through the 40MHz channel, wherein based on the first non-primary channel, the NPCA 20MHz channel and the NPCA 40MHz channel being IDLE, the PPDU is transmitted through the 80MHz channel, and wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, the PPDU is transmitted through the 160MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 160MHz channel is punctured.
  6. The method of claim 1, wherein based on the size of the BSS operating channel being 320MHz, the second non-primary channel includes an NPCA 20MHz channel, an NPCA 40MHz channel, an NPCA 80MHz channel and an NPCA 160MHz channel, the NPCA 20MHz channel is a channel to configure a 40MHz channel capable of transmitting the PPDU together with the first non-primary channel, the NPCA 40MHz channel is a channel to configure an 80MHz channel capable of transmitting the PPDU together with the 40MHz channel, the NPCA 80MHz channel is a channel to configure a 160MHz channel capable of transmitting the PPDU together with the 80MHz channel, and the NPCA 160MHz channel is a channel to configure a 320MHz channel capable of transmitting the PPDU together with the 160MHz channel.
  7. The method of claim 6, wherein the first non-primary channel is located in a 20MHz channel with the second lowest frequency among the BSS operating channels, wherein the primary 20MHz channel is located in a 20MHz channel with the lowest frequency among the BSS operating channels, wherein based on only the first non-primary channel being IDLE, the PPDU is transmitted through the first non-primary channel, wherein based on the first non-primary channel and the NPCA 40MHz channel being IDLE, the PPDU is transmitted through the 80MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 80MHz channel is punctured, wherein based on the first non-primary channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, the PPDU is transmitted through the 160MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 160MHz channel is punctured, and wherein based on the first non-primary channel, the NPCA 40MHz channel, the NPCA 80MHz channel and the NPCA 160MHz channel being IDLE, the PPDU is transmitted through the 320MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 320MHz channel is punctured.
  8. The method of claim 6, wherein the first non-primary channel is located in a 20MHz channel with the third lowest frequency among the BSS operating channels, wherein the primary 20MHz channel is located in a 20MHz channel with the lowest frequency among the BSS operating channels, wherein based on only the first non-primary channel being IDLE, the PPDU is transmitted through the first non-primary channel, wherein based on the first non-primary channel and the NPCA 20MHz channel being IDLE, the PPDU is transmitted through the 40MHz channel, wherein based on the first non-primary channel, the NPCA 20MHz channel and the NPCA 40MHz channel being IDLE, the PPDU is transmitted through the 80MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 80MHz channel is punctured, wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, the PPDU is transmitted through the 160MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 160MHz channel is punctured, and wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel, the NPCA 80MHz channel and the NPCA 160MHz channel being IDLE, the PPDU is transmitted through the 320MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 320MHz channel is punctured.
  9. The method of claim 6, wherein the first non-primary channel is located in a 20MHz channel with the fifth lowest frequency among the BSS operating channels, wherein the primary 20MHz channel is located in a 20MHz channel with the lowest frequency among the BSS operating channels, wherein based on only the first non-primary channel being IDLE, the PPDU is transmitted through the first non-primary channel, wherein based on the first non-primary channel and the NPCA 20MHz channel being IDLE, the PPDU is transmitted through the 40MHz channel, wherein based on the first non-primary channel, the NPCA 20MHz channel and the NPCA 40MHz channel being IDLE, the PPDU is transmitted through the 80MHz channel, wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, the PPDU is transmitted through the 160MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 160MHz channel is punctured, and wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel, the NPCA 80MHz channel and the NPCA 160MHz channel being IDLE, the PPDU is transmitted through the 320MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 320MHz channel is punctured.
  10. The method of claim 6, wherein the first non-primary channel is located in a 20MHz channel with the ninth lowest frequency among the BSS operating channels, wherein the primary 20MHz channel is located in a 20MHz channel with the lowest frequency among the BSS operating channels, wherein based on only the first non-primary channel being IDLE, the PPDU is transmitted through the first non-primary channel, wherein based on the first non-primary channel and the NPCA 20MHz channel being IDLE, the PPDU is transmitted through the 40MHz channel, wherein based on the first non-primary channel, the NPCA 20MHz channel and the NPCA 40MHz channel being IDLE, the PPDU is transmitted through the 80MHz channel, wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, the PPDU is transmitted through the 160MHz channel, and wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel, the NPCA 80MHz channel and the NPCA 160MHz channel being IDLE, the PPDU is transmitted through the 320MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 320MHz channel is punctured.
  11. A receiving station (STA) in a wireless local area network (WLAN) system, the receiving STA comprising: a memory; a transceiver; and a processor being operatively connected to the memory and the transceiver, wherein the processor is configured to: perform back-off for a first non-primary channel; perform channel access for a second non-primary channel based on a back-off value for the first non-primary channel being 0; and transmit a physical layer protocol data unit (PPDU) to a transmitting STA through an IDLE channel among the first and second non-primary channels, wherein the first non-primary channel is a secondary 20MHz channel capable of performing the back-off while a network allocation vector (NAV) is set in a primary 20MHz channel, wherein the second non-primary channel is a remaining secondary channel in a basic service set (BSS) operating channel excluding the first non-primary channel, and wherein a configuration of the first and second non-primary channels is determined based on a size of the BSS operating channel and a location of the first non-primary channel.
  12. A method in a wireless local area network (WLAN) system, the method comprising: performing, by a transmitting station (STA), back-off for a first non-primary channel; performing, by the transmitting STA, channel access for a second non-primary channel based on a back-off value for the first non-primary channel being 0; and receiving, by the transmitting STA, a physical layer protocol data unit (PPDU) from a receiving STA through an IDLE channel among the first and second non-primary channels, wherein the first non-primary channel is a secondary 20MHz channel capable of performing the back-off while a network allocation vector (NAV) is set in a primary 20MHz channel, wherein the second non-primary channel is a remaining secondary channel in a basic service set (BSS) operating channel excluding the first non-primary channel, and wherein a configuration of the first and second non-primary channels is determined based on a size of the BSS operating channel and a location of the first non-primary channel.
  13. The method of claim 12, wherein based on the size of the BSS operating channel being 160MHz, the second non-primary channel includes a non-primary channel access (NPCA) 20MHz channel, an NPCA 40MHz channel and an NPCA 80MHz channel, the NPCA 20MHz channel is a channel to configure a 40MHz channel capable of transmitting the PPDU together with the first non-primary channel, the NPCA 40MHz channel is a channel to configure an 80MHz channel capable of transmitting the PPDU together with the 40MHz channel, and the NPCA 80MHz channel is a channel to configure a 160MHz channel capable of transmitting the PPDU together with the 80MHz channel.
  14. The method of claim 13, wherein the first non-primary channel is located in a 20MHz channel with the second lowest frequency among the BSS operating channels, wherein the primary 20MHz channel is located in a 20MHz channel with the lowest frequency among the BSS operating channels, wherein based on only the first non-primary channel being IDLE, the PPDU is transmitted through the first non-primary channel, wherein based on the first non-primary channel and the NPCA 40MHz channel being IDLE, the PPDU is transmitted through the 80MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 80MHz channel is punctured, and wherein based on the first non-primary channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, the PPDU is transmitted through the 160MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 160MHz channel is punctured.
  15. The method of claim 13, wherein the first non-primary channel is located in a 20MHz channel with the third lowest frequency among the BSS operating channel, wherein the primary 20MHz channel is located in a 20MHz channel with the lowest frequency among the BSS operating channel, wherein based on only the first non-primary channel being IDLE, the PPDU is transmitted through the first non-primary channel, wherein based on the first non-primary channel and the NPCA 20MHz channel being IDLE, the PPDU is transmitted through the 40MHz channel, wherein based on the first non-primary channel, the NPCA 20MHz channel and the NPCA 40MHz channel being IDLE, the PPDU is transmitted through the 80MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 80MHz channel is punctured, and wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, the PPDU is transmitted through the 160MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 160MHz channel is punctured.
  16. The method of claim 13, wherein the first non-primary channel is located in a 20MHz channel with the fifth lowest frequency among the BSS operating channels, wherein the primary 20MHz channel is located in a 20MHz channel with the lowest frequency among the BSS operating channels, wherein based on only the first non-primary channel being IDLE, the PPDU is transmitted through the first non-primary channel, wherein based on the first non-primary channel and the NPCA 20MHz channel being IDLE, the PPDU is transmitted through the 40MHz channel, wherein based on the first non-primary channel, the NPCA 20MHz channel and the NPCA 40MHz channel being IDLE, the PPDU is transmitted through the 80MHz channel, and wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, the PPDU is transmitted through the 160MHz channel, and the PPDU includes information that the primary 20MHz channel included in the 160MHz channel is punctured.
  17. The method of claim 12, wherein based on the size of the BSS operating channel being 320MHz, the second non-primary channel includes an NPCA 20MHz channel, an NPCA 40MHz channel, an NPCA 80MHz channel and an NPCA 160MHz channel, the NPCA 20MHz channel is a channel to configure a 40MHz channel capable of transmitting the PPDU together with the first non-primary channel, the NPCA 40MHz channel is a channel to configure an 80MHz channel capable of transmitting the PPDU together with the 40MHz channel, the NPCA 80MHz channel is a channel to configure a 160MHz channel capable of transmitting the PPDU together with the 80MHz channel, and the NPCA 160MHz channel is a channel to configure a 320MHz channel capable of transmitting the PPDU together with the 160MHz channel.
  18. A transmitting station (STA) in a wireless local area network (WLAN) system, the transmitting STA comprising: a memory; a transceiver; and a processor being operatively connected to the memory and the transceiver, wherein the processor is configured to: perform back-off for a first non-primary channel; perform channel access for a second non-primary channel based on a back-off value for the first non-primary channel being 0; and receive a physical layer protocol data unit (PPDU) from a receiving STA through an IDLE channel among the first and second non-primary channels, wherein the first non-primary channel is a secondary 20MHz channel capable of performing the back-off while a network allocation vector (NAV) is set in a primary 20MHz channel, wherein the second non-primary channel is a remaining secondary channel in a basic service set (BSS) operating channel excluding the first non-primary channel, and wherein a configuration of the first and second non-primary channels is determined based on a size of the BSS operating channel and a location of the first non-primary channel.
  19. A computer readable medium including an instruction being executed by at least one processor and performing a method comprising the steps of: performing back-off for a first non-primary channel; performing channel access for a second non-primary channel based on a back-off value for the first non-primary channel being 0; and transmitting a physical layer protocol data unit (PPDU) to a transmitting station (STA) through an IDLE channel among the first and second non-primary channels, wherein the first non-primary channel is a secondary 20MHz channel capable of performing the back-off while a network allocation vector (NAV) is set in a primary 20MHz channel, wherein the second non-primary channel is a remaining secondary channel in a basic service set (BSS) operating channel excluding the first non-primary channel, and wherein a configuration of the first and second non-primary channels is determined based on a size of the BSS operating channel and a location of the first non-primary channel.
  20. A device in a wireless local area network (WLAN) system, the device comprising: a memory; and a processor being operatively connected to the memory, wherein the processor is configured to: perform back-off for a first non-primary channel; perform channel access for a second non-primary channel based on a back-off value for the first non-primary channel being 0; and transmit a physical layer protocol data unit (PPDU) to a transmitting station (STA) through an IDLE channel among the first and second non-primary channels, wherein the first non-primary channel is a secondary 20MHz channel capable of performing the back-off while a network allocation vector (NAV) is set in a primary 20MHz channel, wherein the second non-primary channel is a remaining secondary channel in a basic service set (BSS) operating channel excluding the first non-primary channel, and wherein a configuration of the first and second non-primary channels is determined based on a size of the BSS operating channel and a location of the first non-primary channel.

Description

TECHNICAL FIELD The present disclosure relates to a technique for transmitting a PPDU by accessing a non-primary channel in a wireless LAN (WLAN) system, and more particularly, relates to a method and an apparatus for performing channel access for a non-primary channel and configuring a channel for transmitting a PPDU for an IDLE channel among non-primary channels. BACKGROUND ART Next-generation Wi-Fi (e.g., IEEE 802.1 The and/or later) aims to support ultra-high reliability when transmitting signals to STAs. To achieve this, various technologies are being considered to support high throughput, low latency, and extended range. For example, a procedure for accessing non-primary channels may be performed. DISCLOSURE TECHNICAL PROBLEM This specification proposes a method and apparatus for transmitting a PPDU by accessing a non-primary channel in a wireless LAN system. TECHNICAL SOLUTION An example of the present disclosure proposes a method for transmitting a PPDU by accessing a non-primary channel. The present embodiment may be performed in a network environment where a next-generation WLAN system (Ultra High Reliability (UHR) WLAN system or next Wi-Fi) is supported. The next-generation WLAN system is a WLAN system that improves the 802.1 The system and may satisfy backward compatibility with the 802.11be system. The present embodiment is performed in a receiving STA, and the receiving STA may relate to at least one station (STA). A transmitting STA of the present embodiment may relate to an access point (AP). The present embodiment proposes a method for transmitting and receiving a PPDU by performing back-off for a non-primary channel and performing channel access for another non-primary channel based on this. Particularly, the present embodiment proposes a method for performing channel access for a non-primary channel and configuring a channel for transmitting a PPDU for an IDLE channel among non-primary channels. A receiving station (STA) performs back-off for a first non-primary channel. The receiving STA performs channel access for a second non-primary channel based on a back-off value for the first non-primary channel being 0. The receiving STA transmits a PPDU to a transmitting STA through an IDLE channel among the first and second non-primary channels. The first non-primary channel is a secondary 20MHz channel capable of performing the back-off while a network allocation vector (NAV) is set in a primary 20MHz channel. The second non-primary channel is a remaining secondary channel excluding the first non-primary channel in a basic service set (BSS) operating channel. A configuration of the first and second non-primary channels is determined based on a size of the BSS operating channel and a location of the first non-primary channel. For example, the present embodiment proposes a method for performing channel access for a non-primary channel (or a secondary channel) in a situation where a NAV (here, a basic NAV) is set in the primary 20MHz channel. However, a channel configuration may be newly defined to access the non-primary channel (or the secondary channel), and a rule may be defined as to which channel is included in the non-primary channel (or the secondary channel) to transmit and receive a PPDU having various bandwidth sizes. ADVANTAGEOUS EFFECTS This embodiment defines the configuration of channels to be used for non-primary channel access. Based on this, it enables back-off to be performed relative to the non-primary channel and allows CCA to be performed for other non-primary channels, thereby enabling the transmission and reception of PPDUs over a wider bandwidth. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of a transmitting apparatus and/or receiving apparatus of the present specification.FIG. 2 is a conceptual view illustrating the structure of a wireless local area network (WLAN).FIG. 3 illustrates a general link setup process.FIG. 4 shows an example of a multi-link (ML).FIG. 5 shows an example of a physical protocol data unit or physical layer (PHY) protocol data unit (PPDU) transmitted/received by an STA of the present disclosure.FIG. 6 is a diagram illustrating the layout of resource units (RUs) used for a 20 MHz PPDU.FIG. 7 is a diagram illustrating the layout of resource units (RUs) used for 40MHz PPDU.FIG. 8 is a diagram illustrating the layout of resource units (RUs) used for an 80MHz PPDU.FIG. 9 shows an operation related to UL-MU.FIG. 10 illustrates an example of channels used/supported/defined within the 2.4 GHz band.FIG. 11 illustrates an example of channels used/supported/defined within the 5 GHz band.FIG. 12 illustrates an example of channels used/supported/defined within the 6 GHz band.FIG. 13 shows an example of a header of a MAC frame.FIG. 14 illustrates an example of a modified transmission device and/or receiving device of the present specification.FIG. 15 illustrates an example of channel access in an 802.11 wireless LAN system.FIG. 16 illustrates an exam