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WO-2026095736-A1 - METHOD AND APPARATUS FOR PERFORMING NON-PRIMARY CHANNEL ACCESS OPERATION IN COMPLEX HIDDEN NODE ENVIRONMENT OF WIRELESS LAN

WO2026095736A1WO 2026095736 A1WO2026095736 A1WO 2026095736A1WO-2026095736-A1

Abstract

In a wireless LAN system, a first STA: detects transmission in a first OBSS and sets a first NAV during a time interval corresponding to the transmission in the first OBSS, the first OBSS being an OBSS detected by both the first STA and a second STA, and the first NAV being also set to the second STA by the transmission in the first OBSS; switches an operating channel from a primary channel to an NPCA channel on the basis of the first NAV, the operating channel of the second STA being also switched from the primary channel to the NPCA channel on the basis of the first NAV; and performs communication on the NPCA channel, the first STA being capable of exchanging NAV information through frame exchanges with a third STA operating on the NPCA channel by a second NAV set by a second OBSS.

Inventors

  • KIM, YONGHO
  • MOON, Juseong
  • LEE, Gwangho

Assignees

  • 홀리스틱매니폴드 주식회사

Dates

Publication Date
20260507
Application Date
20251103
Priority Date
20241103

Claims (20)

  1. In a method of operation of a first station (STA) in a wireless LAN system, A step in which the first STA detects a transmission within a first OBSS (overlapping basic service set) and sets a first time interval corresponding to the transmission within the first OBSS, wherein the first OBSS is an OBSS commonly detected by the first STA and the second STA, and the first time interval is also set in the second STA by the transmission within the first OBSS; A step in which the first STA switches the operating channel from the main channel to the NPCA (non-primary channel access) channel based on the first time interval, wherein the operating channel of the second STA is also switched from the main channel to the NPCA channel based on the first time interval; and The above first STA includes the step of performing communication on the NPCA channel, wherein A method of operation in which the first STA exchanges time interval information with a third STA operating in the NPCA channel through frame exchange by means of a second time interval set by the second OBSS.
  2. In Article 1, A method of operation in which the time at which the first STA returns to the main channel after operating in the NPCA channel and the time at which the third STA returns to the main channel after operating in the NPCA channel are determined to be the same.
  3. In Article 2, A method of operation in which the first STA returns to the main channel from the NPCA channel when the first time interval expires, and the operation channel of the third STA also switches from the NPCA channel to the main channel together with the first STA at the time when the first time interval expires.
  4. In Paragraph 3, A method of operation in which, if the expiration time of the first time interval is earlier than the expiration time of the second time interval, the first STA performs frame transmission to the third STA from the expiration time of the first time interval to the expiration time of the second time interval, but frame transmission by the third STA is not performed from the expiration time of the first time interval to the expiration time of the second time interval.
  5. In Paragraph 3, A method of operation in which a media synchronization-related timer is set in the third STA from the expiration time of the first time interval to the expiration time of the second time interval.
  6. In Paragraph 3, A method of operation in which, at the time of expiration of the first time interval, the third time interval of the third STA is released, and the first STA performs at least one of frame transmission and reception with the third STA on the main channel from the time of expiration of the first time interval.
  7. In Article 1, A method of operation in which, if the expiration time of the first time interval is later than the expiration time of the second time interval, the first STA operates on the NPCA main channel at the expiration time of the second time interval, and the operation channel of the third STA switches from the NPCA main channel to the main channel at the expiration time of the second time interval.
  8. In Article 7, A method of operation in which the length of a transmit opportunity (TXOP) set by the first STA and the third STA in the above NPCA main channel is adjusted based on the expiration time of the second time interval.
  9. In Article 7, A method of operation in which the length of the above TXOP is adjusted to end at a time prior to the operation channel switching delay of the above 3 STA from the time of expiration of the above 2 time interval.
  10. In Article 7, A method of operation in which communication in the main channel by the third STA is stopped from the time of expiration of the second time interval until the first time interval expires and the first STA switches the operating channel from the NPCA main channel to the main channel.
  11. In Article 1, If the expiration time of the first time interval is later than the expiration time of the second time interval, the length of the transmit opportunity (TXOP) set by the first STA and the third STA in the NPCA main channel is adjusted based on the expiration time of the first time interval, and A method of operation in which the first STA and the third STA switch the operating channel from the NPCA main channel to the main channel at the time of expiration of the first time interval.
  12. In Article 11, A method of operation in which a media synchronization-related timer is set in the third STA from the time the operating channel is switched from the NPCA main channel to the main channel.
  13. In Article 1, The first STA receives an initial control frame (ICF) from the third STA in the NPCA channel and transmits an initial control response (ICR) in response to the ICF, wherein A method of operation in which the above ICF includes the second time interval information set in the above third STA, and the above ICR includes the first time interval information set in the above first STA.
  14. In Article 1, The first STA transmits an ICF to the third STA over an NPCA channel and receives an ICR in response to the ICF, A method of operation in which the above ICF includes the first time interval information set in the above first STA, and the above ICR includes the second time interval information set in the above third STA.
  15. In Article 1, A method of operation in which the first time interval and the second time interval are time intervals corresponding to the NAV (network allocation vector).
  16. In Article 1, A method of operation in which the first STA transmits a first frame containing at least one OBSS information detected by the first STA.
  17. In Article 16, The first STA transmits the first frame, which includes at least one OBSS information detected by the first STA, to at least one STA including the second STA, and A method of operation for receiving OBSS information commonly detected in each of the at least one STA based on at least one OBSS information detected by the first STA from each of the at least one STA including the second STA.
  18. In Article 17, A method of operation in which OBSS information commonly detected in each of the at least one STA is transmitted to the first STA through at least one of an uplink frame transmitted to the first STA and a response frame to a frame transmitted by the first STA.
  19. In Article 17, A method of operation in which the first STA supports NPCA operation based on OBSS information commonly detected in each of the at least one STA.
  20. In Article 1, A method of operation in which at least one of the first STA and the second STA is a non-AP STA or an AP STA.

Description

Method and device for performing side-channel access operations in a complex hidden node environment of a wireless LAN The present disclosure relates to a method and apparatus for performing a non-primary channel access operation in a complex hidden node environment of a wireless local area network (WLAN). Additionally, the present disclosure relates to a method and apparatus for performing a non-primary channel access (NPCA) operation in a complex hidden node environment of a wireless LAN. Furthermore, the present disclosure relates to a method and apparatus for initiating an NPCA operation in a complex hidden node environment of a wireless LAN and determining a transmission target terminal on a non-channel. With the recent expansion of mobile device adoption, Wireless Local Area Network (WLAN) technology, capable of providing fast wireless communication services to these devices, is receiving significant attention. Based on short-range wireless communication technology, WLAN technology enables mobile devices such as smartphones, smart pads, laptop computers, portable multimedia players, and embedded devices to connect to the internet wirelessly. Standards using wireless LAN technology are primarily developed by the IEEE (Institute of Electrical and Electronics Engineers) as the IEEE 802.11 standard. As the aforementioned wireless LAN technology has been developed and disseminated, applications utilizing wireless LAN technology have diversified, and a demand has arisen for wireless LAN technology that supports higher reliability. As applications requiring higher reliability emerge, the IEEE 802.11bn standard, an Ultra High Reliability (UHR) wireless LAN technology, is being developed for single Basic Service Set (BSS) environments and/or redundant BSS environments. The goal of the IEEE 802.11bn standard may be to support improved data transmission speeds, enhanced latency performance, and reduced data error rates. Additionally, the IEEE 802.11bn standard can support low-power operation, peer-to-peer communication, and operations designed to increase channel utilization. It can also support a TXOP sharing method, where wireless LAN terminals share communication resources called TXOPs (transmit opportunities) between access points (APs). Furthermore, to increase the efficiency of communication resource utilization, the wireless LAN standard can support non-primary channel access (NPCA) operations, which use a channel other than the primary channel when the primary channel is occupied, and dynamic subchannel operation (DSO). In a wireless LAN network, one can consider cases where the transmission segments by other wireless LAN networks are hidden nodes, and in a communication segment of a wireless LAN network, only a portion of the network may be detected. Here, the segments for performing side-channel access operations may differ for each communication terminal constituting the wireless LAN network, and the return and start times of the side-channel access operations may also differ. Consequently, side-channel access operations may fail or their efficiency may decrease; therefore, measures to address this are described below. Meanwhile, the technology forming the background of the invention is written to enhance understanding of the background of the invention and may include content that is not prior art already known to a person with ordinary knowledge in the field to which this technology belongs. FIG. 1 is a diagram showing a communication node within a wireless LAN system to which the present disclosure applies. FIG. 2 is a drawing showing a wireless LAN system to which the present disclosure is applied. FIGS. 3a and 3b are drawings showing a wireless LAN network configuration for explaining a wireless LAN subchannel access method applied to the present disclosure. FIG. 4 is a diagram illustrating a side-channel access method in a complex hidden node environment to which the present disclosure applies. FIGS. 5a to 5c are drawings illustrating a side-channel access method in a complex hidden node environment to which the present disclosure applies. FIGS. 6a and 6b are drawings illustrating a side-channel access method in a complex hidden node environment to which the present disclosure applies. FIG. 7 is a diagram showing a network configuration applicable to the present disclosure. FIGS. 8a and 8b are drawings illustrating a wireless LAN sub-channel access operation method and a problem occurring during sub-channel access operation applicable to the present disclosure. FIG. 9 is a diagram showing a complex hidden node situation in a wireless LAN network to which the present disclosure applies. FIG. 10 is a diagram illustrating a method for initiating a sub-channel access operation in a complex hidden node situation to which the present disclosure applies. FIG. 11 is a diagram illustrating a method for initiating a sub-channel access operation in a complex hidden node situation to which the present discl