Signaling for multi-link transmission
In a wireless local area network system, a multi-link device (MLD) may transmit a multi-link element including a number-of-links field and a link present field indicating whether the number-of-links field exists. The multi-link element further includes a multi-link control field, a common information field, and a link information field. The number-of-links field may be included in the multi-link control field.
1. A method in a wireless local area network (WLAN) system, the method comprising:
generating, by a station (STA) affiliated with a multi-link device (MLD), an Association Request frame including a multi-link element,
wherein the multi-link element includes a multi-link control field, a common information field which is contiguous to the multi-link control field, and a link information field which is contiguous to the common information field,
wherein the multi-link control field has a length of 2 octets, and the multi-link control field includes a first sub-field which has a length of 1 bit,
wherein the common information field includes a second sub-field, and the second sub-field includes a third sub-field which has a length of 4 bits and is related to a number of stations affiliated with the MLD that support simultaneous transmission or reception of frames on respective links,
wherein the first sub-field is set to a first value based on the second sub-field being present in the common information field,
wherein the common information field further includes an MLD Medium Access Control (MAC) address sub-field; and
transmitting, by the STA, the Association Request frame.
2. The method of claim 1 , wherein the third-sub field indicates a maximum number of stations affiliated with the MLD that support simultaneous transmission or reception on respective links.
3. The method of claim 1 , further comprising:
transmitting a reduced neighbor report (RNR) element, wherein the RNR element includes a target beacon transmission time (TBTT) information field, and the TBTT information field includes an MLD ID subfield identifying the MLD and a Link identifier (ID) subfield identifying a link of the MLD.
4. The method of claim 1 , wherein the MLD operates in a plurality of links, wherein each of the plurality of links is configured based on at least one of 2.4 GHz band, 5 GHz band, and/or 6 GHz band.
5. A station (STA) in a wireless local area network (WLAN) system, the STA comprising:
a transceiver transmitting and/or receiving a wireless signal; and
a processor controlling the transceiver,
wherein the station (STA) affiliated with a multi-link device (MLD),
wherein the processor is configured to:
generate an Association Request frame including a multi-link element,
wherein the multi-link element includes a multi-link control field, a common information field which is contiguous to the multi-link control field, and a link information field which is contiguous to the common information field,
wherein the multi-link control field has a length of 2 octets, and the multi-link control field includes a first sub-field which has a length of 1 bit,
wherein the common information field includes a second sub-field, and the second sub-field includes a third sub-field which has a length of 4 bits and is related to a number of stations affiliated with the MLD that support simultaneous transmission or reception of frames on respective links,
wherein the first sub-field is set to a first value based on the second sub-field being present in the common information field,
wherein the common information field further includes an MLD Medium Access Control (MAC) address sub-field; and
transmit the Association Request frame.
6. The STA of claim 5 , wherein the third-sub field indicates a maximum number of stations affiliated with the MLD that support simultaneous transmission or reception on respective links.
7. The STA of claim 5 , wherein the processor is further configured to: transmit a reduced neighbor report (RNR) element, wherein the RNR element includes a target beacon transmission time (TBTT) information field, and the TBTT information field includes an MLD ID subfield identifying the MLD and a Link identifier (ID) subfield identifying a link of the MLD.
8. The STA of claim 5 , wherein the MLD operates in a plurality of links, wherein each of the plurality of links is configured based on at least one of 2.4 GHz band, 5 GHz band, and/or 6 GHz band.
9. A method in a wireless local area network (WLAN) system, the method comprising:
receiving, from a station (STA) affiliated with a multi-link device (MLD), an Association Request frame including a multi-link element,
wherein the multi-link element includes a multi-link control field, a common information field which is contiguous to the multi-link control field, and a link information field which is contiguous to the common information field,
wherein the multi-link control field has a length of 2 octets, and the multi-link control field includes a first sub-field which has a length of 1 bit,
wherein the common information field includes a second sub-field, and the second sub-field includes a third sub-field which has a length of 4 bits and is related to a number of stations affiliated with the MLD that support simultaneous transmission or reception of frames on respective links,
wherein the first sub-field is set to a first value based on the second sub-field being present in the common information field,
wherein the common information field further includes an MLD Medium Access Control (MAC) address sub-field; and
obtaining the multi-link element included in the Association Request frame.
10. The method of claim 9 , wherein the third-sub field indicates a maximum number of stations affiliated with the MLD that support simultaneous transmission or reception on respective links.
11. The method of claim 9 , further comprising:
receiving a reduced neighbor report (RNR) element, wherein the RNR element includes a target beacon transmission time (TBTT) information field, and the TBTT information field includes an MLD ID subfield identifying the MLD and a Link identifier (ID) subfield identifying a link of the MLD.
12. The method of claim 9 , wherein the MLD operates in a plurality of links, wherein each of the plurality of links is configured based on at least one of 2.4 GHz band, 5 GHz band, and/or 6 GHz band.
13. The method of claim 1 , wherein the first value is 1.
14. The STA of claim 5 , wherein the first value is 1.
15. The method of claim 9 , wherein the first value is 1.