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KR-20260065835-A - Subchannel switching for wireless LAN

KR20260065835AKR 20260065835 AKR20260065835 AKR 20260065835AKR-20260065835-A

Abstract

A station acting as a TXOP (transmission opportunity) responder receives a control frame from the TXOP owner to initiate frame exchange and transmits a response frame in response to the control frame. The response frame includes stop information indicating a stop period during which the TXOP owner stops frame transmission to the TXOP responder.

Inventors

  • 이정수

Assignees

  • 유한회사 프론트사이드

Dates

Publication Date
20260511
Application Date
20240813
Priority Date
20230921

Claims (11)

  1. A method performed by a station acting as a TXOP (transmission opportunity) responder in a WLAN (wireless local area network), The step of receiving a control frame from the TXOP owner to initiate a frame exchange; and The step of transmitting a response frame to the TXOP owner in response to the control frame, wherein A method in which the above response frame includes stop information indicating a stop period in which the TXOP owner stops frame transmission to the TXOP responder.
  2. In Article 1, A step of obtaining a first TXOP interval based on the interval field of the above control frame; and A method characterized by including the step of setting the interval field of the response frame to a value corresponding to the second TXOP interval based on the first TXOP interval.
  3. In Article 2, A method characterized in that the second TXOP section is shorter than the first TXOP section.
  4. In Article 2, A method characterized by the above TXOP owner completing a frame exchange with the above TXOP responder within the above second TXOP interval.
  5. In Article 1, A method characterized by further including an application level indicating whether the above-mentioned stop information is applied at the MLD (multi-link device) level or at the link level.
  6. In Article 1, A method characterized in that the above control frame includes a trigger frame.
  7. In a device acting as a TXOP (transmission opportunity) responder, processor; and It includes a memory that stores instructions connected to the processor and which cause the device to perform a function when executed by the processor, wherein the function is: Receive a control frame from the TXOP owner to initiate a frame exchange; and Includes transmitting a response frame to the TXOP owner in response to the control frame, The above response frame is a device containing stop information indicating a stop period in which the TXOP owner stops frame transmission to the TXOP responder.
  8. In claim 7, the above function Obtaining a first TXOP interval based on the interval field of the above control frame; and An apparatus characterized by further including setting the interval field of the response frame to a value corresponding to the second TXOP interval based on the first TXOP interval.
  9. In Article 8, A device characterized in that the second TXOP section is shorter than the first TXOP section.
  10. In Article 8, A device characterized in that the TXOP owner completes a frame exchange with the TXOP responder within the second TXOP interval.
  11. In Article 7, A device characterized by the above stop information further including an application level indicating whether the stop section is applied at the MLD (multi-link device) level or at the link level.

Description

Subchannel switching for wireless LAN This specification relates to a wireless local area network (WLAN), and more specifically, to a method for switching subchannels in a WLAN and an apparatus using the same. A WLAN (wireless local area network) can be configured by one or more APs (access points) that provide a shared wireless communication medium available to multiple client devices, also known as STAs (stations). OFDMA (orthogonal frequency division multiple access) is a multiple access method in which subsets of different subcarriers are assigned to different users. Using this method, data can be transmitted to one or more users simultaneously or transmitted from users. A PPDU (physical layer protocol data unit) is a unit of data (or data packet) that conveys various information in a WLAN. In OFDMA, a subset of different subcarriers is assigned to a user, and this subset can change from one PPDU to the next. Using OFDMA, an AP can assign different RUs (resource units) to STAs. An AP can simultaneously transmit PPDUs of various formats to multiple STAs. In WLAN, the network allocation vector (NAV) is an indicator maintained by each STA that represents the period during which the STA does not initiate transmission to the wireless medium (WM), regardless of whether the STA's clear channel assessment (CCA) function detects that the wireless medium (WM) is in use. The transmission opportunity (TXOP) is the time interval during which a specific STA has the authority to initiate a frame switching sequence onto the WM. In order to successfully exchange various PPUDs and prevent situations where access to WM is impossible, it is required to set and reset TXOP and NAV. Figure 1 illustrates a block diagram of an exemplary wireless communication network. Figure 2 shows a block diagram of an exemplary wireless communication device. Figures 3 and 4 show various examples of PPDUs that can be used for wireless communication between an AP and a STA. Figure 5 shows an example of UL MU transmission. Figure 6 shows an example of multilink operation. FIG. 7 shows an example of a TXOP operation according to an embodiment of the present specification. FIG. 8 shows another example illustrating a TXOP operation according to an embodiment of the present specification. FIG. 9 shows another example illustrating a TXOP operation according to an embodiment of the present specification. FIG. 10 shows another example illustrating a TXOP operation according to an embodiment of the present specification. FIG. 11 shows an example of a TXOP operation according to an embodiment of the present specification. FIG. 12 shows an example of NAV reset according to an embodiment of the present specification. FIG. 13 shows an example of NAV reset according to an embodiment of the present specification. FIG. 14 shows an example of NAV reset according to an embodiment of the present specification. FIG. 15 shows an example of a NAV reset according to an embodiment of the present specification. The following relates to specific embodiments for illustrating aspects of this specification. However, those skilled in the art will readily recognize that the contents of this specification may be applied in various ways. The described implementation may be implemented in any device, system, or network capable of transmitting and receiving RF (radio frequency) signals according to one or more of the IEEE (Institute of Electrical and Electronics Engineers) 802.11 standard, the IEEE 802.15 standard, Bluetooth standards defined by the SIG (Bluetooth Special Interest Group), or LTE (Long Term Evolution), 3G, 4G, or 5G (NR (New Radio)) standards published by the 3GPP (3rd Generation Partnership Project). The described implementation may be implemented in one or more of the following technologies: CDMA (code division multiple access), TDMA (time division multiple access), FDMA (frequency division multiple access), OFDMA (orthogonal FDMA), SC-FDMA (single-carrier FDMA), SU-MIMO (single-user multiple-input multiple-output), and MU-MIMO (multi-user MIMO), or in any device, system, or network capable of transmitting and receiving RF signals according to the technology. The described implementation may also be implemented using other wireless communication protocols or RF signals suitable for use in one or more of the following: WPAN (wireless personal area network), WLAN (wireless local area network), WWAN (wireless wide area network), or IoT (internet of things) networks. OFDMA (orthogonal frequency division multiple access) is an OFDM (orthogonal frequency division multiplexing) multiple access method in which subsets of different subcarriers are assigned to different users, allowing data to be transmitted to one or more users simultaneously. In OFDMA, a different subset of subcarriers is assigned to a user, and this subset can be changed from one PPDU to the next. Like OFDM, OFDMA uses multiple subcarriers, but the subcarriers are divided into several groups, each gr