TWT management and management frames for multi-link devices

1. A multi-link device (MLD) access point configured to establish a target wake time (TWT) with an MLD station, wherein a plurality of links are established between the MLD access point and the MLD station, comprising:

a transmitter configured to:

transmit a TWT set up frame to the MLD station configured to indicate whether the TWT set up frame is applied to multiple links of the plurality of links;

announce a broadcast TWT by transmitting a TWT element with just one Broadcast TWT Parameter Set field if the one Broadcast TWT Parameter Set field includes optional fields; and

negotiate with the MLD station an individual TWT for multiple links, through the TWT element wherein the number of the multiple links to which the individual TWTs applies is less than or equal to the number of radios of the MLD access point and the MLD station, and the number of the multiple links to which the individual TWT applies is up to the total number of links when the MLD station is an enhanced multi-link single radio/enhanced multi-link multi-radio (eMLSR/eMLMR) mode.

2. The MLD access point of claim 1 , wherein the individual TWT Wake time is a time synchronization function (TSF) time of a link with a smallest link ID.

3. The MLD access point of claim 1 , wherein the individual TWT Wake time is a time synchronization function (TSF) time of a link with a largest link ID.

4. The MLD access point of claim 1 , wherein the transmitter is further configured to tear down the individual TWT by transmitting to the MLD AP a single frame that is applied to more than one link of the number of the multiple.

5. He MLD access point of claim 1 , wherein the transmitter is further configured to send a single frame that may be applied to more than one link of the number of the multiple to suspend or resume the individual TWT.

6. The MLD access point of claim 1 , wherein an update related to the broadcast TWT includes the insertion of the Broadcast TWT Parameter Set field.

7. The MLD access point of claim 1 , wherein the update related to the broadcast TWT includes the termination of a broadcast TWT agreement through announcing a Reject TWT in a TWT Setup Command field.

8. The MLD access point of claim 1 , wherein the update related to the broadcast TWT includes the update of the broadcast TWT agreement through announcing an Alternate TWT in the TWT Setup Command field.

9. The MLD access point of claim 1 , wherein the one Broadcast TWT Parament set field includes a Broadcast TWT Info field, and the Broadcast Info field includes a No Member Indication field that indicates whether there are no members in a restricted TWT.

10. The MLD access point of claim 9 , wherein the MDL STA that supports the restricted TWT does not need to stop its transmit opportunity at the beginning of the service period of the restricted TWT when there are no members in the restricted TWT.

11. The MLD access point of claim 1 , wherein the one Broadcast TWT Parament set field includes a Broadcast TWT Info field, and the Broadcast Info field includes a Full Member Indication field that indicates whether the MLD access point will accept a membership request for a restricted TWT.

12. The MLD access point of claim 1 , wherein the Broadcast TWT Parament set field includes a restricted TWT Traffic Info field.

13. The MLD access point of claim 1 , wherein the TWT element includes a plurality of Broadcast TWT Parament set fields, and only the last of the plurality of Broadcast TWT Parament set fields includes the restricted TWT Traffic Info field.

14. The MLD access point of claim 1 , wherein when the MLD STA negotiates TWT membership, a temporary channel in a broadcast TWT SP is negotiated in a subchannel selective transmission secondary channel.

15. A multi-link device (MLD) access point configured to establish communication with an enhanced multi-link single radio/enhanced multi-link multi-radio (eMLSR/eMLMR) MLD station, the multi-link device (MLD) access point, comprising:

a transmitter configured to:

transmit a TWT set up frame to the (eMLSR/eMLMR) MLD station configured to indicate whether the TWT set up frame is applied to multiple links of the plurality of links;

announce a broadcast TWT by transmitting a TWT element with just one Broadcast TWT Parameter Set field if a Broadcast TWT Parameter Set field includes optional fields; and

negotiate with the MLD station an individual TWT for multiple links, through one TWT element,

wherein the number of the multiple links to which the individual TWT applies is less than or equal to the number of radios of the MLD access point and the MLD station, and

the number of the multiple links to which the individual TWT applies is up to the total number of links when the MLD station is an enhanced multi-link single radio/enhanced multi-link multi-radio (eMLSR/eMLMR) mode.

16. The MLD access point of claim 15 , wherein the negotiated individual TWT for the multiple links is accepted in all links in the eMLSR mode.

17. The MLD access point of claim 15 , wherein the negotiated individual TWT for the multiple links is accepted in a subset of links in the eMLSR mode.

18. The MLD access point of claim 15 , wherein the negotiated individual TWT for the multiple links is a synchronized TWT agreement in all the links that have same TWT parameters except applied links.

19. The 1A1) access point of claim 15 , wherein the transmitter is further configured to transmit a single TWT suspension resumption action frame that suspends/resumes the synchronized TWT agreements in all the links.

20. The MLD access point of claim 15 , wherein the transmitter is further configured to transmit a single TWT teardown action frame to tear down the synchronized TWT agreements in all the links.