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US-20260129705-A1 - METHOD AND WIRELESS COMMUNICATION TERMINAL FOR TRANSMITTING/RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM

US20260129705A1US 20260129705 A1US20260129705 A1US 20260129705A1US-20260129705-A1

Abstract

Disclosed is a method by which a station (STA) of a multi-link device (MLD) transmits frames in a wireless communication system. In the present invention, an MLD transmits, to an AP MLD including at least one access point (AP), a request message related to a channel access, and receives a response message in response to the request message.

Inventors

  • Hanseul HONG
  • Geonjung KO
  • Sanghyun Kim
  • Juhyung Son
  • Jinsam Kwak

Assignees

  • WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC.

Dates

Publication Date
20260507
Application Date
20251231
Priority Date
20210129

Claims (20)

  1. 1 - 18 . (canceled)
  2. 19 . A non-access point station (non-AP STA) of a non-AP multi-link device (MLD) configured to operate in a wireless communication system, the non-AP STA comprising: a transceiver; and a processor, wherein the multi-link device comprises two or more STAs, and the processor is configured to: transmit a request frame related to a multi-link (ML) setup to an AP MLD including two or more APs, wherein the request frame includes a multi-link element including a type field indicating a type of the multi-link element, wherein the multi-link element includes a link information field including one or more Per-STA Profile subelements related to one or more reported non-AP STAs included in the non-AP MLD, and receive a response frame as a response to the request frame, wherein, when the type of the multi-link element indicated by the type field is a basic type, each of the one or more Per-STA Profile subelements includes a STA medium access control (MAC) address field indicating a MAC address of a specific STA corresponding to each of the one or more Per-STA Profile subelements among the one or more reported non-AP STAs when each of the one or more Per-STA Profile subelements includes a complete profile of the specific STA.
  3. 20 . The non-AP STA of claim 19 , wherein, when the type of the multi-link element indicated by the type field is a probe request, the multi-link element does not include the STA MAC address field.
  4. 21 . The non-AP STA of claim 19 , wherein, when the type of the multi-link element indicated by the type field is a basic type, each of the one or more Per-STA Profile subelements includes a complete profile subfield indicating whether the complete profile is included in each of the one or more Per-STA Profile subelements.
  5. 22 . The non-AP STA of claim 19 , wherein each of the one or more Per-STA Profile subelements includes a link identifier (ID) field, and wherein a specific value among a plurality of values indicated by the link ID field is not used to uniquely identify any link of an AP among the two or more APs affiliated with the AP MLD.
  6. 23 . The non-AP STA of claim 22 , wherein the specific value of the link ID field is ‘15’.
  7. 24 . The non-AP STA of claim 19 , wherein the response frame comprises neighbor AP information field corresponding to information on an AP other than an AP having transmitted the response frame, among the two or more APs included in the AP MLD, and wherein octets after a specific octet of a target beacon transmission time (TBTT) information field included in the neighbor AP information field are not processed according to a type of the STA.
  8. 25 . The non-AP STA of claim 24 , wherein, when the STA is an EHT STA, the octets after the specific octet are processed, and wherein, when the STA is an HE STA, the octet after the specific octet are not processed.
  9. 26 . The non-AP STA of claim 24 , wherein the specific octet is a 13th octet.
  10. 27 . The non-AP STA of claim 24 , wherein the neighbor AP information comprises a length field indicating a length of the TBTT information field included in the neighbor AP information field, and wherein one or more fields included in the TBTT information field included in the neighbor AP information field is identified on the basis of a value of the length field.
  11. 28 . The non-AP STA of claim 19 , wherein a common information field included in the multi-link element does not include an MLD MAC address field specifying a MAC address of the non-AP MLD when the type of the multi-link element indicated by the type field is a probe request.
  12. 29 . A method for transmitting a frame by a station (STA) of a multi-link device (MLD) configured to operate in a wireless communication system, the method comprising: transmitting a request frame related to a multi-link (ML) setup to an AP MLD including two or more APs, wherein the request frame includes a multi-link element including a type field indicating a type of the multi-link element, wherein the multi-link element includes a link information field including one or more Per-STA Profile subelements related to one or more reported non-AP STAs included in the non-AP MLD; and receiving a response frame as a response to the request frame, wherein, when the type of the multi-link element indicated by the type field is a basic type, each of the one or more Per-STA Profile subelements includes a STA medium access control (MAC) address field indicating a MAC address of a specific STA corresponding to each of the one or more Per-STA Profile subelements among the one or more reported non-AP STAs when each of the one or more Per-STA Profile subelements includes a complete profile of the specific STA.
  13. 30 . The method of claim 29 , wherein, when the type of the multi-link element indicated by the type field is a probe request, the multi-link element does not include the STA MAC address field.
  14. 31 . The method of claim 29 , wherein, when the type of the multi-link element indicated by the type field is a basic type, each of the one or more Per-STA Profile subelements includes a complete profile subfield indicating whether the complete profile is included in each of the one or more Per-STA Profile subelements.
  15. 32 . The method of claim 29 , wherein each of the one or more Per-STA Profile subelements includes a link identifier (ID) field, and wherein a specific value among a plurality of values indicated by the link ID field is not used to uniquely identify any link of an AP among the two or more APs affiliated with the AP MLD.
  16. 33 . The method of claim 32 , wherein the specific value of the link ID field is ‘15’.
  17. 34 . The method of claim 29 , wherein the response frame comprises neighbor AP information field corresponding to information on an AP other than an AP having transmitted the response frame, among the two or more APs included in the AP MLD, and wherein octets after a specific octet of a target beacon transmission time (TBTT) information field included in the neighbor AP information field are not processed according to a type of the STA.
  18. 35 . The method of claim 34 , wherein, when the STA is an EHT STA, the octets after the specific octet are processed, and wherein, when the STA is an HE STA, the octet after the specific octet are not processed.
  19. 36 . The method of claim 34 , wherein the specific octet is a 13th octet.
  20. 37 . The method of claim 34 , wherein the neighbor AP information comprises a length field indicating a length of the TBTT information field included in the neighbor AP information field, and wherein one or more fields included in the TBTT information field included in the neighbor AP information field is identified on the basis of a value of the length field.

Description

TECHNICAL FIELD The present invention relates to a wireless communication system and, more specifically, to a structure of a radio frame, a decoding method, and a wireless communication terminal. BACKGROUND ART In recent years, with supply expansion of mobile apparatuses, a wireless LAN technology that can provide a rapid wireless Internet service to the mobile apparatuses has been significantly spotlighted. The wireless LAN technology allows mobile apparatuses including a smart phone, a smart pad, a laptop computer, a portable multimedia player, an embedded apparatus, and the like to wirelessly access the Internet in home or a company or a specific service providing area based on a wireless communication technology in a short range. Institute of Electrical and Electronics Engineers (IEEE) 802.11 has commercialized or developed various technological standards since an initial wireless LAN technology is supported using frequencies of 2.4 GHz. First, the IEEE 802.11b supports a communication speed of a maximum of 11 Mbps while using frequencies of a 2.4 GHz band. IEEE 802.11a which is commercialized after the IEEE 802.11b uses frequencies of not the 2.4 GHz band but a 5 GHz band to reduce an influence by interference as compared with the frequencies of the 2.4 GHz band which are significantly congested and improves the communication speed up to a maximum of 54 Mbps by using an OFDM technology. However, the IEEE 802.11a has a disadvantage in that a communication distance is shorter than the IEEE 802.11b. In addition, IEEE 802.11g uses the frequencies of the 2.4 GHz band similarly to the IEEE 802.11b to implement the communication speed of a maximum of 54 Mbps and satisfies backward compatibility to significantly come into the spotlight and further, is superior to the IEEE 802.11a in terms of the communication distance. Moreover, as a technology standard established to overcome a limitation of the communication speed which is pointed out as a weak point in a wireless LAN, IEEE 802.11n has been provided. The IEEE 802.11n aims at increasing the speed and reliability of a network and extending an operating distance of a wireless network. In more detail, the IEEE 802.11n supports a high throughput (HT) in which a data processing speed is a maximum of 540 Mbps or more and further, is based on a multiple inputs and multiple outputs (MIMO) technology in which multiple antennas are used at both sides of a transmitting unit and a receiving unit in order to minimize a transmission error and optimize a data speed. Further, the standard can use a coding scheme that transmits multiple copies which overlap with each other in order to increase data reliability. As the supply of the wireless LAN is activated and further, applications using the wireless LAN are diversified, the need for new wireless LAN systems for supporting a higher throughput (very high throughput (VHT)) than the data processing speed supported by the IEEE 802.11n has come into the spotlight. Among them, IEEE 802.11ac supports a wide bandwidth (80 to 160 MHz) in the 5 GHz frequencies. The IEEE 802.11ac standard is defined only in the 5 GHz band, but initial 11ac chipsets will support even operations in the 2.4 GHz band for the backward compatibility with the existing 2.4 GHz band products. Theoretically, according to the standard, wireless LAN speeds of multiple stations are enabled up to a minimum of 1 Gbps and a maximum single link speed is enabled up to a minimum of 500 Mbps. This is achieved by extending concepts of a wireless interface accepted by 802.11n, such as a wider wireless frequency bandwidth (a maximum of 160 MHz), more MIMO spatial streams (a maximum of 8), multi-user MIMO, and high-density modulation (a maximum of 256 QAM). Further, as a scheme that transmits data by using a 60 GHz band instead of the existing 2.4 GHz/5 GHZ, IEEE 802.11ad has been provided. The IEEE 802.11ad is a transmission standard that provides a speed of a maximum of 7 Gbps by using a beamforming technology and is suitable for high bit rate moving picture streaming such as massive data or non-compression HD video. However, since it is difficult for the 60 GHz frequency band to pass through an obstacle, it is disadvantageous in that the 60 GHz frequency band can be used only among devices in a short-distance space. As a wireless LAN standard after 802.11ac and 802.11ad, the IEEE 802.11ax (high efficiency WLAN, HEW) standard for providing a high-efficiency and high-performance wireless LAN communication technology in a high-density environment, in which APs and terminals are concentrated, is in the development completion stage. In an 802.11ax-based wireless LAN environment, communication with high frequency efficiency should be provided indoors/outdoors in the presence of high-density stations and access points (APs), and various technologies have been developed to implement the same. In order to support new multimedia applications, such as high-definition video and real-t