KR-20260063508-A - METHOD AND APPARATUS FOR RETRANSMISSION OF DSO ICF IN WIRELESS LOCAL AREA NETWORK SYSTEM

Abstract

The present disclosure relates to an improved wireless LAN system. The present disclosure proposes a method and apparatus that take into account NPCA in an improved wireless LAN system. Specifically, the present disclosure comprises a method performed by an AP of a wireless LAN system, the step of transmitting a first frame to initiate a DSO to a first STA and a second STA, and the step of transmitting a second frame associated with the DSO to a plurality of STAs including the second STA.

Inventors

• 변성호
• 김서욱
• 김정준
• 구종회
• 최진호
• 하태영

Assignees

• 삼성전자주식회사

Dates

Publication Date

20260507

Application Date

20241030

Claims (20)

1. In a method performed by an access point (AP) of a wireless local area network (WLAN) system, A step of transmitting a first frame to initiate a dynamic subband operation (DSO) to a first STA (station) and a second STA; and The method includes the step of transmitting a second frame associated with the DSO to a plurality of STAs including the second STA, and A method in which the operating band of the second STA is changed from the primary channel of the AP to the secondary channel of the AP based on the first frame.
2. In paragraph 1, A method in which, if the AP does not receive a response frame for the first frame from the first STA and the second STA, the second frame is a CF-End (contention-free end) frame for terminating the TXOP (transmission opportunity) initiated by the first frame.
3. In paragraph 1, A method in which, if the AP does not receive a response frame for the first frame from the first STA on the primary channel, the second frame includes a retransmission of the first frame.
4. In paragraph 3, The first frame for initiating the above DSO is an ICF (initial control frame) including an intermediate FCS (frame check sequence) and at least one padding bit, and A method in which the first frame being retransmitted is a control frame that does not include the intermediate FCS and the at least one padding bit.
5. In paragraph 3, The number of retransmissions of the first frame being retransmitted within the above TXOP is based on at least one of the More TF field or a parameter regarding the number of retransmissions, and A method in which the above More TF field is included in the Common Info field included in the first frame and has a value of 1.
6. In paragraph 3, A method in which the first frame for initiating the above DSO is a BSRP (buffer status report poll) trigger frame or a MU-RTS (multi-user request-to-send) trigger frame.
7. In paragraph 6, A method in which, when the first frame for initiating the DSO is the BSRP trigger frame, the response frame is in a TB (trigger-based) PPDU (physical layer protocol data unit) format or a non-HT (high throughput) PPDU format.
8. In paragraph 6, A method in which, when the first frame for initiating the above DSO is the MU-RTS trigger frame, the response frame is a CTS (Clear-To-Send) frame.
9. In Paragraph 7, A method in which the above response frame includes a BSR (buffer status report) and an M-BA (multi-station block ACK).
10. In paragraph 1, The second frame above includes a trigger frame or downlink data for requesting uplink transmission, and A method wherein the second frame is transmitted to the second STA on the secondary channel and transmitted to the STA operating on the primary channel among the plurality of STAs excluding the second STA on the primary channel.
11. In an access point (AP) of a wireless local area network (WLAN) system, transceiver; and It includes at least one processor connected to the above-mentioned transmitting and receiving unit, and The above at least one processor is: Transmit a first frame to initiate a dynamic subband operation (DSO) to the first STA (station) and the second STA, and A plurality of STAs including the second STA are configured to transmit a second frame associated with the DSO, and The operating band of the above-mentioned second STA is changed from the primary channel of the AP to the secondary channel of the AP based on the above-mentioned first frame, AP.
12. In Paragraph 11, If the AP does not receive a response frame for the first frame from the first STA and the second STA, the second frame is a CF-End (contention-free end) frame for terminating the TXOP (transmission opportunity) initiated by the first frame.
13. In Paragraph 11, If the AP does not receive a response frame for the first frame from the first STA on the primary channel, the second frame includes a retransmission of the first frame.
14. In Paragraph 13, The first frame for initiating the above DSO is an ICF (initial control frame) including an intermediate FCS (frame check sequence) and at least one padding bit, and AP, wherein the first frame being retransmitted is a control frame that does not include the intermediate FCS and the at least one padding bit.
15. In Paragraph 13, The number of retransmissions of the first frame being retransmitted within the above TXOP is based on at least one of the More TF field or a parameter regarding the number of retransmissions, and The above More TF field is included in the Common Info field included in the first frame and is an AP having a value of 1.
16. In Paragraph 13, AP, wherein the first frame for initiating the above DSO is a BSRP (buffer status report poll) trigger frame or a MU-RTS (multi-user request-to-send) trigger frame.
17. In Paragraph 16, AP, wherein if the first frame for initiating the above DSO is the BSRP trigger frame, the response frame is in TB (trigger-based) PPDU (physical layer protocol data unit) format or non-HT (high throughput) PPDU format.
18. In Paragraph 16, AP, wherein if the first frame for initiating the above DSO is the MU-RTS trigger frame, the response frame is a CTS (Clear-To-Send) frame.
19. In Paragraph 17, The above response frame is an AP that includes a BSR (buffer status report) and an M-BA (multi-station block ACK).
20. In Paragraph 11, The second frame above includes a trigger frame or downlink data for requesting uplink transmission, and AP, wherein the second frame is transmitted to the second STA on the secondary channel and is transmitted to the STA operating on the primary channel among the plurality of STAs excluding the second STA on the primary channel.

Description

Method and apparatus for retransmission of DSO ICF in wireless LAN system The present disclosure relates to a wireless local area network (WLAN) system. Specifically, the present disclosure relates to a method and apparatus for retransmitting an initial control frame (ICF) of a dynamic sub-band operation (DSO) in a wireless LAN system. Wireless LAN (WLAN) systems are evolving for various purposes, such as improving transmission rates, increasing bandwidth, enhancing reliability, reducing errors, and reducing latency. The Institute of Electrical and Electronics Engineers (IEEE) publishes the 802.11 standard specification for wireless LAN systems, and the technology described in the 802.11 standard specification can be referred to as WiFi (or Wi-Fi, Wireless Fidelity). Wi-Fi technology has evolved through several generations of 802.11 standards. For example, the 802.11ac standard covers improvements for VHT (very high throughput), the 802.11ax standard covers improvements for HE (high efficiency), and the 802.11be standard covers improvements for EHT (extreme high throughput). Meanwhile, technologies to provide an improved wireless communication environment in wireless LAN systems are being discussed, and various technologies are being proposed and researched in response to the demand to further enhance the reliability of wireless LAN systems. FIG. 1 illustrates the configuration of a device for wireless communication according to one embodiment of the present disclosure. FIG. 2 illustrates an exemplary structure of a wireless LAN system related to the present disclosure. FIG. 3 illustrates a link setup process related to the present disclosure. FIG. 4 illustrates a backoff operation related to the present disclosure. FIG. 5 illustrates a CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) based frame transmission operation related to the present disclosure. FIG. 6 illustrates an exemplary format of a frame used in a wireless LAN system related to the present disclosure. FIG. 7 illustrates an exemplary format of a PPDU (physical layer protocol data unit) of a wireless LAN system related to the present disclosure. FIG. 8 illustrates another exemplary format of a PPDU of a wireless LAN system related to the present disclosure. FIG. 9 illustrates a method for transmitting a BSRP trigger frame of a wireless LAN system related to the present disclosure. FIG. 10 illustrates the concept of a DSO in a wireless LAN system related to the present disclosure. FIG. 11 illustrates a method in a wireless LAN system according to one embodiment of the present disclosure when an AP fails to receive a response frame. FIG. 12 illustrates a method in a wireless LAN system according to one embodiment of the present disclosure when an AP fails to receive a portion of a response frame. FIG. 13 illustrates a method in a wireless LAN system according to one embodiment of the present disclosure in which an AP fails to receive a portion of a response frame. FIG. 14a illustrates a method in a wireless LAN system according to one embodiment of the present disclosure when an AP fails to receive a portion of a response frame. FIG. 14b illustrates a method in a wireless LAN system according to one embodiment of the present disclosure in which an AP fails to receive a portion of a response frame. FIG. 15a illustrates a method in a wireless LAN system according to one embodiment of the present disclosure in the case where the AP fails to receive part of the response frame. FIG. 15b illustrates a method in a wireless LAN system according to one embodiment of the present disclosure in which an AP fails to receive a portion of a response frame. FIG. 16a illustrates a method in a wireless LAN system according to one embodiment of the present disclosure in the case where the AP fails to receive part of the response frame. FIG. 16b illustrates a method in a wireless LAN system according to one embodiment of the present disclosure in which an AP fails to receive a portion of a response frame. FIG. 17a illustrates a method in a wireless LAN system according to one embodiment of the present disclosure in which an AP fails to receive a portion of a response frame. FIG. 17b illustrates a method in a wireless LAN system according to one embodiment of the present disclosure in which an AP fails to receive a portion of a response frame. FIG. 18 illustrates a flowchart of an operation for transmitting NPCA feedback information in a wireless LAN system according to one embodiment of the present disclosure. Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that identical components in the accompanying drawings are represented by the same reference numerals whenever possible. Furthermore, detailed descriptions of known functions and configurations that may obscure the essence of the present disclosure will be omitted. In describing the embodiments in thi