Signaling for multi-link communication in a wireless local area network (WLAN)
This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for signaling between an access point (AP) multi-link device (MLD) and a non-AP MLD that support multi-link communication in a wireless local area network (WLAN). In some implementations, a multi-link association may include a first link (referred to as an anchor link) and one or more other links (referred to as auxiliary links). The signaling may include control information to activate or deactivate auxiliary links dynamically based on communication load, throughput requirements, or quality of service (QoS). The signaling also may include requests, acknowledgments, or negotiation regarding multi-link connections. Furthermore, signaling and timing information may be used to coordinate when auxiliary links are used for communication or when to promote an auxiliary link to an anchor link.
1. An apparatus for wireless communications at a first wireless communication device, comprising:
a processor configured to:
establish a multi-link association between the first wireless communication device and a second wireless communication device, wherein the multi-link association includes a first link between the first wireless communication device and the second wireless communication device and further includes a second link between the first wireless communication device and the second wireless communication device; and
a modem configured to:
obtain, from the second wireless communication device, a frame indicative that the second wireless communication device has activated one or more links of the multi-link association in accordance with data traffic associated with the first wireless communication device.
2. The apparatus of claim 1 , wherein the modem is further configured to:
output a second frame that includes multi-link information, wherein the multi-link information is indicative of which of the first link and the second link are to be activated in accordance with which of the first link or the second link have the data traffic.
3. The apparatus of claim 2 , wherein the second frame is a beacon frame, and wherein the modem is further configured to:
communicate multi-link capability parameters between the first wireless communication device and the second wireless communication device, wherein the multi-link capability parameters include at least a first value indicating a warm up time associated with a time for the second wireless communication device to activate the second link.
4. The apparatus of claim 2 , wherein the first link is maintained as a primary link for signaling the multi-link information for the multi-link association, and wherein the one or more links can be dynamically activated using the second frame.
5. The apparatus of claim 2 , wherein the multi-link information is indicative of which of the first link or the second link have the data traffic.
6. The apparatus of claim 2 , wherein the multi-link information is included in an aggregated control (A-Control) field of a header of the second frame.
7. The apparatus of claim 2 , wherein the first wireless communication device is an access point (AP) entity including a first AP and a second AP and the second wireless communication device is a non-AP entity including a first station (STA) and a second STA, and wherein the first link is between the first AP of the AP entity and the first STA of the non-AP entity and the second link is between the second AP of the AP entity and the second STA of the non-AP entity.
8. The apparatus of claim 7 , wherein the multi-link information includes one or more traffic identifiers (TIDs) mapped to respective ones of the first link and the second link, wherein:
the processor is further configured to:
delay data traffic associated with a traffic identifier (TID) mapped to the second link when the second STA is not activated; and
the modem is further configured to:
output the second frame via the first link to indicate that the second link is to be activated in accordance with the data traffic being mapped to the second link when the second STA is not activated.
9. The apparatus of claim 2 , wherein the multi-link information is indicative of which of the first link and the second link are to be activated in accordance with an amount of data to be sent to the second wireless communication device.
10. The apparatus of claim 1 , wherein the modem is further configured to:
obtain a second frame from the second wireless communication device via the first link or the second link; and
output an acknowledgement via the first link or the second link from which the frame was received.
11. The apparatus of claim 1 , wherein, to establish the multi-link association, the modem is further configured to:
output, via the first link, a configuration regarding the second link, the configuration indicating one or more parameters selected from a group consisting of quality of service, bandwidth, wireless channel, transmission rate, and frequency band.
12. The apparatus of claim 1 , wherein, to establish the multi-link association, the modem is further configured to:
output frames to the second wireless communication device via either the first link or the second link based on which of the first link and the second link are activated.
13. The apparatus of claim 1 , wherein the frame is a frame format selected from a group consisting of a management frame, a control frame, a data frame, a request to send (RTS), a clear to send (CTS), an acknowledgement, a power saving poll (PS-POLL) frame, a quality-of service (QoS) Null frame, and a null data packet (NDP).
14. An apparatus for wireless communications at a first wireless communication device, comprising:
a processor configured to:
establish a multi-link association between the first wireless communication device and a second wireless communication device, wherein the multi-link association includes a first link between the first wireless communication device and the second wireless communication device and further includes a second link between the first wireless communication device and the second wireless communication device; and
a modem configured to:
output, to the second wireless communication device, a frame indicative that the first wireless communication device has activated one or more links of the multi-link association in accordance with data traffic associated with the first wireless communication device.
15. The apparatus of claim 14 , wherein the modem is further configured to:
obtain, via the first link, a second frame that includes multi-link information, wherein the multi-link information is indicative of which links of the first link and the second link are to be activated in accordance with which of the first link or the second link have the data traffic.
16. The apparatus of claim 15 , wherein the first link is maintained as a primary link for receiving the multi-link information for the multi-link association, and wherein the one or more links can be dynamically activated using the second frame.
17. The apparatus of claim 15 , wherein the first wireless communication device is a non-access point (AP) entity including a first station (STA) and a second STA and the second wireless communication device is an AP entity including a first AP and a second AP, and wherein the first link is between the first AP of the AP entity and the first STA of the non-AP entity and the second link is between the second AP of the AP entity and the second STA of the non-AP entity.
18. The apparatus of claim 17 , wherein the multi-link information is indicative of the second link having data traffic, and wherein the processor is further configured to:
activate the second STA to receive the data traffic for the second link.
19. The apparatus of claim 17 , wherein the multi-link information includes signaling associated with activating the second link, wherein the processor is further configured to:
deactivate the first STA;
switch from a first connection associated with the first STA to a second connection associated with the second STA; and
activate the second STA.
20. The apparatus of claim 14 , wherein, to establish the multi-link association, the modem is further configured to:
output a capability parameter indicating a warm up time associated with a time for the first wireless communication device to activate the second link.
21. A method for wireless communication an access point (AP) multi-link device (MLD) by a first wireless communication device, comprising:
establishing a multi-link association between the first wireless communication device and a second wireless communication device, wherein the multi-link association includes a first link between the first wireless communication device and the second wireless communication device and further includes a second link between the first wireless communication device and the second wireless communication device; and
receiving, from the second wireless communication device, a frame indicative that the second wireless communication device has activated one or more links of the multi-link association in accordance with data traffic associated with the first wireless communication device.
22. The method of claim 21 , further comprising:
transmitting a second frame that includes multi-link information, wherein the multi-link information is indicative of which of the first link and the second link are to be activated in accordance with which of the first link or the second link have the data traffic.
23. The method of claim 22 , wherein the second frame is a beacon frame, and wherein establishing the multi-link association comprises:
communicating multi-link capability parameters between the first wireless communication device and the second wireless communication device, wherein the multi-link capability parameters include at least a first value indicating a warm up time associated with a time for the second wireless communication device to activate the second link.
24. The method of claim 21 , further comprising:
receiving a second frame from the second wireless communication device via the first link or the second link; and
transmitting an acknowledgement via the first link or the second link from which the frame was received.
25. The method of claim 21 , wherein establishing the multi-link association comprises:
transmitting, via the first link, a configuration regarding the second link, the configuration indicating one or more parameters selected from a group consisting of quality of service, bandwidth, wireless channel, transmission rate, and frequency band.
26. The method of claim 21 , further comprising:
delaying a communication of data from the first wireless communication device to the second wireless communication device on the second link until the second link is activated by the second wireless communication device.
27. The method of claim 21 , wherein the first wireless communication device is an access point (AP) entity including a first AP and a second AP and the second wireless communication device is a non-AP entity including a first station (STA) and a second STA, and wherein the first link is between the first AP of the AP entity and the first STA of the non-AP entity and the second link is between the second AP of the AP entity and the second STA of the non-AP entity.
28. A method for wireless communication by a first wireless communication device, comprising:
establishing a multi-link association between the first wireless communication device and a second wireless communication device, wherein the multi-link association includes a first link between the first wireless communication device and the second wireless communication device and further includes a second link between the first wireless communication device and the second wireless communication device; and
transmitting, to the second wireless communication device, a frame indicative that the first wireless communication device has activated one or more links of the multi-link association in accordance with data traffic associated with the first wireless communication device.
29. The method of claim 28 , wherein the first wireless communication device is a non-access point (AP) entity including a first station (STA) and a second STA and the second wireless communication device is an AP entity including a first AP and a second AP, and wherein the first link is between the first AP of the AP entity and the first STA of the non-AP entity and the second link is between the second AP of the AP entity and the second STA of the non-AP entity.
30. The method of claim 29 , further comprising:
receiving, via the first link, a second frame that includes multi-link information, wherein the multi-link information is indicative of which links of the first link and the second link are to be activated, and wherein the multi-link information is indicative of the second link having the data traffic; and
activating the second STA to receive data for the second link.