US-12628216-B2 - Link setting method and device for multi-link transmission in wireless LAN communication system

Abstract

The present invention relates to an operating method of a first communication node in a communication system, comprising the steps of: negotiating with a second communication node with respect to a parameter for multi-link transmission; determining, on the basis of the parameter, a plurality of links for performing the multi-link transmission, and the transmission method by which the multi-link transmission is performed; and transmitting, in the plurality of links, a data frame to the second communication node by means of the transmission method. Therefore, the communication node can efficiently set and change links.

Inventors

• Sung Hyun Hwang
• Kyu Min Kang
• Jae cheol Park
• Jin Hyung OH
• Su Na CHOI
• Yong Ho Kim
• Han Seul Hong

Assignees

• ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
• KOREA NATIONAL UNIVERSITY OF TRANSPORTATION INDUSTRY-ACADEMIC COOPERATION FOUNDATION

Dates

Publication Date

20260512

Application Date

20200710

Priority Date

20190712

Claims (15)

1. 1 . An operation method of a first device supporting multi-links in a communication system, the operation method comprising: performing a monitoring operation for receiving a management frame using a first link which is a primary link among the multi-links; receiving the management frame from a first access point (AP) affiliated with a second device through the monitoring operation; identifying information of a second link supported by the second device among the multi-links from the management frame; receiving a first frame including information of a fourth link which is a new primary link from the first AP; and changing the primary link from the first link to the fourth link, wherein the primary link is used for transmitting and receiving the management frame with the second device, and the information of the fourth link includes a link appliance timer field which indicates a time at which the primary link is changed to be the new primary link and a field indicating a bandwidth extension direction of the new primary link.
2. 2 . The operation method according to claim 1 , wherein the management frame is a beacon frame or a probe response frame.
3. 3 . The operation method according to claim 1 , wherein the information of the second link includes a target beacon transmission time (TBTT) information field for a second AP which is affiliated with the second device and operates in the second link.
4. 4 . The operation method according to claim 1 , wherein the information of the second link includes an identifier of the second link.
5. 5 . The operation method according to claim 1 , wherein the first link is a link in which an association procedure between the first device and the second device is performed.
6. 6 . The operation method according to claim 1 , further comprising receiving information of a third link of a third AP affiliated with the second device from the second device after establishing the multi-links.
7. 7 . The operation method according to claim 1 , wherein the management frame further includes information of a third link supported by the second device among the multi-links, and the information of the third link includes a TBTT information field for a third AP which is affiliated with the second device and operates in the third link and an identifier of the third link.
8. 8 . An operation method of a second device supporting multi-links in a communication system, the operation method comprising: generating a management frame including information of a second link supported by the second device among the multi-links; transmitting the management frame using a first link which is a primary link among the multi-links; configuring a fourth link as a new primary link; and announcing a probe response frame including information of the fourth link to the first device, wherein the primary link is used for transmitting and receiving the management frame with the first device, and the information of the fourth link includes a link appliance timer field which indicates a time at which the primary link is changed to be the new primary link and a field indicating a bandwidth extension direction of the new primary link.
9. 9 . The operation method according to claim 8 , wherein the management frame is a beacon frame or the probe response frame.
10. 10 . The operation method according to claim 8 , wherein the information of the second link includes a target beacon transmission time (TBTT) information field for a second AP which is affiliated with the second device and operates in the second link.
11. 11 . The operation method according to claim 8 , wherein the information of the second link includes an identifier of the second link.
12. 12 . The operation method according to claim 8 , wherein the first link is a link in which an association procedure between the first device and the second device is performed.
13. 13 . The operation method according to claim 8 , wherein the management frame further includes information of a third link supported by the second device among the multi-links, and the information of the third link includes a TBTT information field for a third AP which is affiliated with the second device and operates in the third link and an identifier of the third link.
14. 14 . The operation method according to claim 1 , further comprising establishing the multi-links including the first link and the second link with the second device.
15. 15 . The operation method according to claim 8 , further comprising establishing the multi-links including the first link and the second link with a first device receiving the management frame.

Description

TECHNICAL FIELD The present invention relates to a method and an apparatus for link configuration for multi-link transmission in a wireless LAN communication system, and more specifically, to a method, an apparatus, and a system for configuring a primary link in multi-link transmission. BACKGROUND ART Recently, with the spread of mobile devices, wireless LAN (WLAN) technology, which can provide fast wireless Internet service to them, is getting much attention. The WLAN technology is a technology that enables mobile devices such as smart phones, smart pads, laptop computers, portable multimedia players, and embedded devices to wirelessly connect to the Internet based on wireless communication technology at a short range. The standards using the WLAN are mainly developed as the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standards by the IEEE. The IEEE 802.11 standards were developed and progressed in a way of revising them through later versions starting with the initial version supporting 1-2 mega bits per second (Mbps). The IEEE 802.11a revised version supports up to 54 Mbps by using an orthogonal frequency division multiplexing (OFDM) scheme in a 5 GHz band, and the IEEE 802.11b supports transmission rates of up to 11 Mbps in a 2.4 GHz band in which the initial version operates by utilizing a direct sequence spread spectrum (DSSS) scheme. Then, due to a demand for higher speed, the revised version of IEEE 802.11n, which includes high throughput (HT) WLAN technologies, operates in the OFDM scheme, and was developed to improve the maximum transmission rate by using a channel bandwidth extension and multiple input multiple output (MIMO) in the 2.4 GHz band and 5 GHz band. As a result, when using 4 spatial steams and 40 MHz bandwidth, the maximum transmission rate has been improved to support up to 600 Mbps. As the WLAN technology has been developed and spread, applications utilizing the WLAN technology have been diversified, and a demand for a WLAN technology supporting a higher throughput has arisen. Accordingly, a very high throughput (VHT) WLAN technology, which further expands a used frequency bandwidth (up to 160 MHz or 80+80 MHz) and extends the number of supported spatial streams to support a high throughput of 1 giga bits per second (Gbps) or more, has been applied to the IEEE 802.11ac revised version. In addition, the corresponding standard supports downlink transmission to multiple terminals by using the MIMO. Also, as the demand for the WLAN technology increases further, the revised version of IEEE 802.11ax has been developed to utilize multi-user (MU) MIMO and orthogonal frequency division multiple access (OFDMA) even for uplink by using a MU-OFDMA based transmission procedure. Recently, as applications that require higher throughput and applications that require real-time transmission have occurred, an extreme high throughput (EHT) WLAN technology has been proposed, and development to enact a revision of the IEEE 802.11be is currently being progressed. The standard aims to support a high throughput of 30 Gbps, and it was agreed to introduce an operation of reducing a frame transmission delay. In the corresponding standard, a further wider frequency bandwidth (e.g., 320 MHz, etc.), multi-link transmission and aggregation operations including operations using multiple bands, and techniques such as multiple access point (AP) transmission operations and efficient retransmission operations (e.g., hybrid automatic repeat request (HARQ)) have been proposed as main functions. However, the multi-link operation is an operation that has not been defined in the conventional WLAN standards. Therefore, in order to perform the corresponding operation, it may be necessary to negotiate a link configuration and a transmission scheme between an AP multi-link device (MLD) and a station (STA) MLD performing the multi-link operation. In addition, it may be necessary to define a method of configuring a primary link among multiple links and a method of changing the primary link. In this case, fairness with conventional STAs using a different band may need to be considered to perform the corresponding operation. Further, since different operations may be performed depending on whether each STA is equipped with independent transceivers, a method for a channel access scheme may need to be defined. Meanwhile, the prior arts of the present invention have been prepared to enhance understanding of the background of the present invention, and may include contents other than the prior arts already known to ordinary skilled persons in the field to which the present invention belongs. DISCLOSURE Technical Problem An objective of the present invention for solving the above-described problem is directed to allowing a STA MLD and an AP MLD to negotiate a multi-link transmission scheme for performing a multi-link operation and to perform a channel access based thereon, so that an enhanced multi-link transmission o