Technique for performing multi-link communication in wireless communication system
According to various embodiments, a multi-link device (MLD) operating on a plurality of links may perform the steps of: determining a condition for transmitting second link-associated information via a first link among the plurality of links; determining whether or not the second link-associated information has changed; and on the basis of the second link-associated information being changed, transmitting the changed second link-associated information via the first link.
1 . A method performed by an access point (AP) multi-link device (MLD) in a wireless local area network system, the method comprising:
configuring, by a first AP affiliated with the AP MLD, a first Beacon frame,
wherein it is determined that the first AP carries a Channel Switch Announcement element corresponding to a second AP in the first Beacon frame based on a second Beacon frame transmitted by the second AP including the Channel Switch Announcement element corresponding to the second AP and the second AP being affiliated with the AP MLD;
transmitting, by the first AP, the first Beacon frame including the Channel Switch Announcement element corresponding to the second AP based on the second Beacon frame including the Channel Switch Announcement element corresponding to the second AP and the second AP being affiliated with the AP MLD; and
based on the first Beacon frame, transmitting, by the first AP, an extremely high throughput (EHT) physical protocol data unit (PPDU) including a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field which is contiguous to the L-SIG field, a universal signal (U-SIG) field which is contiguous to the RL-SIG field,
wherein the L-SIG field includes a length field which has a value satisfying a condition that a remainder is zero when the length field is divided by three, and the remainder differentiates the EHT PPDU from a high efficiency (HE) PPDU,
wherein the RL-SIG field is a repeat of the L-SIG field,
wherein the RL-SIG field includes four extra subcarriers at frequency indexes of {−28, −27, 27, 28}, and values on the four extra subcarriers are {−1, −1, −1, 1}, respectively,
wherein the U-SIG field carries information to interpret the EHT PPDU,
wherein the U-SIG field includes version independent fields followed by version dependent fields,
wherein the version independent fields include first information related to a physical version of the EHT PPDU, second information related to a bandwidth of the EHT PPDU, third information related to an identifier of a BSS, fourth information indicating that the EHT PPDU is transmitted in downlink (DL), and fifth information related to a transmission opportunity (TXOP).
2 . The method of claim 1 , wherein the first AP is a reporting AP operating on a first link and the second AP is a reported AP operating on a second link.
3 . An access point (AP) multi-link device (MLD) in a wireless local area network system, comprising:
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
configuring, by a first AP affiliated with the AP MLD, a first Beacon frame,
wherein it is determined that the first AP carries a Channel Switch Announcement element corresponding to a second AP in the first Beacon frame based on a second Beacon frame transmitted by the second AP including the Channel Switch Announcement element corresponding to the second AP and the second AP being affiliated with the AP MLD;
transmitting, by the first AP, the first Beacon frame including the Channel Switch Announcement element corresponding to the second AP based on the second Beacon frame including the Channel Switch Announcement element corresponding to the second AP and the second AP being affiliated with the AP MLD; and
based on the first Beacon frame, transmitting, by the first AP, an extremely high throughput (EHT) physical protocol data unit (PPDU) including a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field which is contiguous to the L-SIG field, a universal signal (U-SIG) field which is contiguous to the RL-SIG field,
wherein the L-SIG field includes a length field which has a value satisfying a condition that a remainder is zero when the length field is divided by three, and the remainder differentiates the EHT PPDU from a high efficiency (HE) PPDU,
wherein the RL-SIG field is a repeat of the L-SIG field,
wherein the RL-SIG field includes four extra subcarriers at frequency indexes of {−28, −27, 27, 28}, and values on the four extra subcarriers are {−1, −1, −1, 1}, respectively, wherein the U-SIG field carries information to interpret the EHT PPDU,
wherein the U-SIG field includes version independent fields followed by version dependent fields,
wherein the version independent fields include first information related to a physical version of the EHT PPDU, second information related to a bandwidth of the EHT PPDU, third information related to an identifier of a BSS, fourth information indicating that the EHT PPDU is transmitted in downlink (DL), and fifth information related to a transmission opportunity (TXOP).
4 . The AP MLD of claim 3 , wherein the first AP is a reporting AP operating on a first link and the second AP is a reported AP operating on a second link.