CN-122003945-A - Method and apparatus for performing channel access for non-primary channels based on a switching timer in a wireless LAN system

Abstract

Methods and apparatus for performing channel access for non-primary channels based on a handoff timer in a wireless LAN system are presented. Specifically, the receiving STA receives the first management frame from the transmitting STA. The receiving STA transmits a second management frame to the transmitting STA. After expiration of the handoff timer, the receiving STA performs channel access for the first non-primary channel.

Inventors

• CHE DONGZHU
• ZHANG RENSHAN
• Cui Zhenzhu
• Bai Shanxi
• JIN QIANHUAN
• YIN YILIN

Assignees

• LG电子株式会社

Dates

Publication Date

20260508

Application Date

20241010

Priority Date

20231010

Claims (16)

1. 1. A method in a wireless local area network, WLAN, system, the method comprising the steps of: receiving, by the receiving station STA, a first management frame from the transmitting STA; Transmitting, by the receiving STA, a second management frame to the transmitting STA, and After expiration of the handoff timer, channel access is performed by the receiving STA for the first non-primary channel, Wherein the first management frame includes information about a first switching time that occurs based on the transmitting STA switching from a primary 20 MHz channel to the first non-primary channel for channel access, Wherein the second management frame includes information about a second switching time that occurs based on the receiving STA switching from the primary 20 MHz channel to the first non-primary channel for the channel access, and Wherein the switching timer is configured based on a longer time among the first switching time and the second switching time.
2. 2. The method of claim 1, further comprising the step of: performing backoff for the first non-primary channel by the receiving STA, Wherein the first non-primary channel is a secondary 20 MHz channel capable of performing the backoff when a network allocation vector NAV is set in the primary 20 MHz channel.
3. 3. The method of claim 2, further comprising the step of: Based on the backoff value for the first non-primary channel becoming 0 before the expiration of the handoff timer, the receiving STA waits until the handoff timer expires, and After the expiration of the handoff timer, a request to send RTS frame is received by the receiving STA from the transmitting STA over the first non-primary channel.
4. 4. The method of claim 2, further comprising the step of: Reconfiguring, by the receiving STA, a backoff value for the first non-primary channel based on the backoff value becoming 0 before expiration of the handoff timer, and Based on the reconfigured backoff value becoming 0 after expiration of the handoff timer, an RTS frame is received by the receiving STA from the transmitting STA over the first non-primary channel.
5. 5. The method of claim 2, further comprising the step of: Based on the backoff value for the first non-primary channel becoming 0 before the expiration of the switching timer, adjusting, by the receiving STA, a setting range of the backoff value based on a difference between the first switching time and the second switching time; Reselecting the backoff value by the receiving STA within the adjusted setup range, and Based on the reselected backoff value becoming 0 after expiration of the handoff timer, an RTS frame is received by the receiving STA from the transmitting STA over the first non-primary channel.
6. 6. The method of claim 2, further comprising the step of: performing channel access by the receiving STA for a second non-primary channel based on a backoff value of 0 for the first non-primary channel, and Transmitting or receiving a physical protocol data unit PPDU through an idle channel among the first non-primary channel and the second non-primary channel by the receiving STA, Wherein the second non-primary channel is the remaining secondary channels of the basic service set, BSS, operating channel other than the first non-primary channel.
7. 7. A receiving station STA in a wireless local area network WLAN system, the receiving STA comprising: A memory; Transceiver, and A processor operatively connected to the memory and the transceiver, Wherein the processor is configured to: receiving a first management frame from a transmitting STA; transmitting a second management frame to the transmitting STA, and After expiration of the handoff timer, channel access is performed for the first non-primary channel, Wherein the first management frame includes information about a first switching time that occurs based on the transmitting STA switching from a primary 20 MHz channel to the first non-primary channel for channel access, Wherein the second management frame includes information about a second switching time that occurs based on the receiving STA switching from the primary 20 MHz channel to the first non-primary channel for the channel access, and Wherein the switching timer is configured based on a longer time among the first switching time and the second switching time.
8. 8. A method in a wireless local area network, WLAN, system, the method comprising the steps of: transmitting, by a transmitting station STA, a first management frame to a receiving STA; receiving, by the transmitting STA, a second management frame from the receiving STA, and After expiration of the handoff timer, channel access is performed by the transmitting STA for the first non-primary channel, Wherein the first management frame includes information about a first switching time that occurs based on the transmitting STA switching from a primary 20 MHz channel to the first non-primary channel for channel access, Wherein the second management frame includes information about a second switching time that occurs based on the receiving STA switching from the primary 20 MHz channel to the first non-primary channel for the channel access, and Wherein the switching timer is configured based on a longer time among the first switching time and the second switching time.
9. 9. The method of claim 8, further comprising the step of: performing backoff for the first non-primary channel by the transmitting STA, Wherein the first non-primary channel is a secondary 20 MHz channel capable of performing the backoff when a network allocation vector NAV is set in the primary 20 MHz channel.
10. 10. The method of claim 9, further comprising the step of: Based on the backoff value for the first non-primary channel becoming 0 before the expiration of the handoff timer, the transmitting STA waits until the handoff timer expires, and After the handoff timer expires, a request to send RTS frame is sent by the transmitting STA to the receiving STA over the first non-primary channel.
11. 11. The method of claim 9, further comprising the step of: Reconfiguring, by the transmitting STA, a backoff value for the first non-primary channel based on the backoff value becoming 0 before expiration of the handoff timer, and Based on the reconfigured backoff value becoming 0 after expiration of the handoff timer, an RTS frame is transmitted by the transmitting STA to the receiving STA over the first non-primary channel.
12. 12. The method of claim 9, further comprising the step of: Based on the backoff value for the first non-primary channel becoming 0 before the expiration of the switching timer, adjusting, by the transmitting STA, a setting range of the backoff value based on a difference between the first switching time and the second switching time; Reselecting the backoff value by the transmitting STA within the adjusted setup range, and Based on the reselected backoff value becoming 0 after expiration of the handoff timer, an RTS frame is transmitted by the transmitting STA to the receiving STA over the first non-primary channel.
13. 13. The method of claim 9, further comprising the step of: performing channel access by the transmitting STA for a second non-primary channel based on a backoff value of 0 for the first non-primary channel, and Receiving or transmitting a physical protocol data unit PPDU by the transmitting STA through an idle channel among the first non-primary channel and the second non-primary channel, Wherein the second non-primary channel is the remaining secondary channels of the basic service set, BSS, operating channel other than the first non-primary channel.
14. 14. A transmitting station STA in a wireless local area network WLAN system, the transmitting STA comprising: A memory; Transceiver, and A processor operatively connected to the memory and the transceiver, Wherein the processor is configured to: transmitting a first management frame to the receiving STA; Receiving a second management frame from the receiving STA, and After expiration of the handoff timer, channel access is performed for the first non-primary channel, Wherein the first management frame includes information about a first switching time that occurs based on the transmitting STA switching from a primary 20 MHz channel to the first non-primary channel for channel access, Wherein the second management frame includes information about a second switching time that occurs based on the receiving STA switching from the primary 20 MHz channel to the first non-primary channel for the channel access, and Wherein the switching timer is configured based on a longer time among the first switching time and the second switching time.
15. 15. A computer-readable medium comprising instructions for execution by at least one processor and performing a method comprising: receiving a first management frame from a transmitting station STA; transmitting a second management frame to the transmitting STA, and After expiration of the handoff timer, channel access is performed for the first non-primary channel, Wherein the first management frame includes information about a first switching time that occurs based on the transmitting STA switching from a primary 20 MHz channel to the first non-primary channel for channel access, Wherein the second management frame includes information about a second switching time that occurs based on switching of the receiving STA from the primary 20 MHz channel to the first non-primary channel for the channel access, and Wherein the switching timer is configured based on a longer time among the first switching time and the second switching time.
16. 16. An apparatus in a wireless local area network, WLAN, system, the apparatus comprising: Memory, and The processor may be configured to perform the steps of, the processor is operatively connected to the memory, Wherein the processor is configured to: receiving a first management frame from a transmitting station STA; transmitting a second management frame to the transmitting STA, and After expiration of the handoff timer, channel access is performed for the first non-primary channel, Wherein the first management frame includes information about a first switching time that occurs based on the transmitting STA switching from a primary 20 MHz channel to the first non-primary channel for channel access, Wherein the second management frame includes information about a second switching time that occurs based on switching of the receiving STA from the primary 20 MHz channel to the first non-primary channel for the channel access, and Wherein the switching timer is configured based on a longer time among the first switching time and the second switching time.

Description

Method and apparatus for performing channel access for non-primary channels based on a switching timer in a wireless LAN system Technical Field The present embodiment relates to a scheme for performing channel access for a non-primary channel based on a switching timer in a Wireless Local Area Network (WLAN) system, and more particularly, to a method and apparatus for determining timing for performing channel access for a non-primary channel by setting a switching timer based on information about a channel switching delay delivered through a management frame. Background The next generation Wi-Fi (e.g., IEEE 802.11be and/or beyond) is intended to support ultra-high reliability when transmitting signals to STAs. To achieve this, various techniques are considered to support high throughput, low latency, and extended range. For example, a procedure for accessing a non-primary channel may be performed. Disclosure of Invention Technical problem The present specification proposes a method and apparatus for performing channel access for a non-primary channel based on a handover timer in a wireless LAN system. Technical proposal Examples of the present disclosure propose a method for performing channel access for a non-primary channel based on a handover timer. The present embodiment may be performed in a network environment supporting a next generation WLAN system (ultra high reliability (UHR) WLAN system or next Wi-Fi). The next generation WLAN system is a WLAN system that improves the 802.11be system and can satisfy backward compatibility with the 802.11be system. The present embodiment is performed in a receiving STA, and the receiving STA may involve at least one Station (STA). The transmitting STA of the present embodiment may relate to an Access Point (AP). The present embodiment proposes a method for performing channel access for a non-primary channel by delivering information on a channel switching delay occurring based on switching from the primary channel to the non-primary channel using a management frame. In particular, the present embodiment can solve the misalignment problem that may occur due to different channel switching times between the AP and the STA by setting a switching timer to set the timing at which the non-primary channel performs channel access based on information about a channel switching delay. A receiving Station (STA) receives a first management frame from a transmitting STA. The receiving STA transmits a second management frame to the transmitting STA. After expiration of the handoff timer, the receiving STA performs channel access for the first non-primary channel. The first management frame includes information about a first switching time that occurs based on the transmitting STA switching from the primary 20 MHz channel to the first non-primary channel for channel access. The second management frame includes information about a second switching time that occurs based on the receiving STA switching from the primary 20 MHz channel to the first non-primary channel for channel access. The switching timer is configured based on a longer time of the first switching time and the second switching time. The first management frame may be a beacon or probe response frame or a (re) association response frame. The second management frame may be a probe request frame or a (re) association request frame. For example, the present embodiment proposes a method for configuring a switching timer in consideration of a channel switching time of an AP and a channel switching time of an STA delivered through a management frame and performing channel access for a non-primary channel after the switching timer expires. Advantageous effects The present embodiment relates to a method that can prevent unnecessary frame exchange from being performed through a non-primary channel and can achieve an effect of preventing medium waste based on an AP or STA not completing channel switching from the primary channel to the non-primary channel. Drawings Fig. 1 shows an example of a transmitting device and/or a receiving device of the present specification. Fig. 2 is a conceptual diagram illustrating a structure of a Wireless Local Area Network (WLAN). Fig. 3 illustrates a general link establishment procedure. Fig. 4 shows an example of a Multilink (ML). Fig. 5 illustrates 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 a layout of a Resource Unit (RU) for 20 MHz PPDU. Fig. 7 illustrates a layout of a Resource Unit (RU) for 40MHz PPDU. Fig. 8 is a diagram illustrating a layout of a Resource Unit (RU) for 80 MHz PPDU. Fig. 9 illustrates operations associated with 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 cha