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EP-4742815-A1 - METHOD AND DEVICE FOR TRANSMITTING PPDU BY ACCESSING NON-PRIMARY CHANNEL IN WIRELESS LAN SYSTEM

EP4742815A1EP 4742815 A1EP4742815 A1EP 4742815A1EP-4742815-A1

Abstract

Proposed are a method and device for transmitting a PPDU by accessing a non-primary channel in a wireless LAN system. Specifically, a reception STA performs backoff on a first non-primary channel. The reception STA performs channel access to a second non-primary channel when the value of the backoff on the first non-primary channel is zero. The reception STA transmits the PPDU to a transmission STA through an idle channel among the first and second non-primary channels. The first non-primary channel is a secondary 20 MHz channel on which the backoff can be performed while an 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
20240820

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 the first non-primary channel is located in a secondary channel having a half size of the BSS operating 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 the 80MHz 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 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.
  4. The method of claim 3, wherein based on the first non-primary channel, the NPCA 20MHz channel and the NPCA 40MHz channel being IDLE, based on the primary 20MHz channel being located in the NPCA 80MHz channel, the 80MHz channel is not punctured, and based on the primary 20MHz channel being located in the 80MHz channel, a 20MHz channel in which the primary 20MHz channel is located among the 80MHz channel is punctured.
  5. The method of claim 3, wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, a 20MHz channel or a 40MHz channel in which the primary 20MHz channel is located among 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 the 160MHz 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, 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.
  8. The method of claim 7, wherein based on the first non-primary channel, the NPCA 20MHz channel and the NPCA 40MHz channel being IDLE, based on the primary 20MHz channel being located in the NPCA 80MHz channel, the 80MHz channel is not punctured, and based on the primary 20MHz channel being located in the 80MHz channel, a 20MHz channel in which the primary 20MHz channel is located among the 80MHz channel is punctured.
  9. The method of claim 7, wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, based on the primary 20MHz channel being located in the NPCA 160MHz channel, the 160MHz channel is not punctured, and based on the primary 20MHz channel being located in the 160MHz channel, a 20MHz channel in which the primary 20MHz channel is located among the 160MHz channel is punctured.
  10. The method of claim 7, 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, at least one of a first 40MHz channel, a second 40MHz channel and a third 40MHz channel is punctured in the 320MHz channel, wherein the first 40MHz channel is a 40MHz channel in which the primary 20MHz channel is located, wherein the second 40MHz channel is a 40MHz channel continuous with the first 40MHz channel, and wherein the third 40MHz channel is a remaining 40MHz channel excluding the first and second 40MHz channels in the 320MHz channel.
  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 the first non-primary channel is located in a secondary channel having a half size of the BSS operating 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 the first non-primary channel is located in a secondary channel having a half size of the BSS operating 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 the 80MHz 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 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.
  15. The method of claim 14, wherein based on the first non-primary channel, the NPCA 20MHz channel and the NPCA 40MHz channel being IDLE, based on the primary 20MHz channel being located in the NPCA 80MHz channel, the 80MHz channel is not punctured, and based on the primary 20MHz channel being located in the 80MHz channel, a 20MHz channel in which the primary 20MHz channel is located among the 80MHz channel is punctured.
  16. The method of claim 14, wherein based on the first non-primary channel, the NPCA 20MHz channel, the NPCA 40MHz channel and the NPCA 80MHz channel being IDLE, a 20MHz channel or a 40MHz channel in which the primary 20MHz channel is located among 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 the first non-primary channel is located in a secondary channel having a half size of the BSS operating 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 the first non-primary channel is located in a secondary channel having a half size of the BSS operating 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 the first non-primary channel is located in a secondary channel having a half size of the BSS operating channel.

Description

TECHNICAL FIELD This disclosure relates to a technique for transmitting a physical layer protocol data unit (PPDU) by accessing a non-primary channel in a wireless local area network (WLAN) system, and more particularly, to a method and apparatus for configuring a limited rule for determining a location of a non-primary channel within a basic service set (BSS) operating channel of an access point (AP). BACKGROUND ART Next-generation Wi-Fi (e.g., IEEE 802.11be 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 802.11be 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 of transmitting and receiving a physical layer protocol data unit (PPDU) by performing back-off for a non-primary channel and performing channel access for another non-primary channel based on this. In particular, the present embodiment proposes a limited rule for determining a location of a non-primary channel within a basic service set (BSS) operating channel of an access point (AP). 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 the 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 in a BSS operating channel excluding the first non-primary channel. The first non-primary channel is located in a secondary channel having a half size of the BSS operating channel. For example, the present embodiment proposes a method of performing channel access for a non-primary channel (or a secondary channel) in a situation where the NAV (here, a basic NAV) is set in the primary 20MHz channel. ADVANTAGEOUS EFFECTS This embodiment has an effect of maximizing channel utilization in terms of a bandwidth and a puncturing pattern of a PPDU by proposing a limited rule for determining a location of a non-primary channel within a BSS operating channel of an AP. In addition, based on determining the non-primary channel considering that OBSS traffic and the non-primary channel overlap through the present embodiment, it is possible to have a gain in terms of a probability of performing channel access for the non-primary channel, and it is also possible to have an effect that efficiency for wideband utilization can be improved. 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 example of the basic procedure