Method and apparatus for mobile ap backhaul link setup and operation
Methods and apparatuses for facilitating the use of stations (STAs) of a multi-link device (MLD) to set up and operate backhaul links to serve a Mobile access point (AP) within the same MLD in a wireless local area network. The apparatuses include an MLD comprising APs forming a Mobile AP MLD, backhaul STAs, and a processor operably coupled to the APs and the backhaul STAs. The processor is configured to instruct at least one of the APs to set up an access link with a corresponding STA of a non-AP MLD, and to instruct at least one of the backhaul STAs to set up a backhaul link with a corresponding AP of an AP MLD to carry traffic of the non-AP MLD that flows through the Mobile AP MLD over the access link.
1 . A multi-link device (MLD) comprising:
access points (APs) forming a Mobile AP MLD, each of the APs configured as an AP station (STA) and comprising a transceiver, the APs configured to form a primary link and a non-primary link with corresponding stations (STAs) configured as non-AP STAs of a non-AP MLD;
backhaul STAs, each of the backhaul STAs configured as a non-AP STA and comprising a transceiver; and
a processor operably coupled to the APs and the backhaul STAs, the processor configured to:
instruct at least one of the APs to set up an access link with its corresponding STA; and
instruct at least one of the backhaul STAs to set up a backhaul link with a corresponding AP configured as an AP STA of an AP MLD to carry traffic of the non-AP MLD that flows through the Mobile AP MLD over the access link.
2 . The MLD of claim 1 , wherein:
the processor is further configured to generate a capability indication that indicates availability of the backhaul STAs to form the backhaul link,
the transceiver of the at least one AP is configured to:
transmit, to the corresponding STA of the non-AP MLD, the capability indication; and
receive, from the corresponding STA of the non-AP MLD, a request to set up the backhaul link, and
the processor is further configured to instruct the at least one backhaul STA to set up the backhaul link in response to the received request.
3 . The MLD of claim 2 , wherein the processor is further configured to generate the capability indication as a reduced neighbor report element or as a basic multi-link element.
4 . The MLD of claim 1 , wherein:
the processor is further configured to generate an indication of information of the APs of the Mobile AP MLD for which the backhaul link carries traffic, and
the transceiver of the at least one backhaul STA is configured to transmit, to the corresponding AP of the AP MLD, the indication.
5 . The MLD of claim 1 , wherein:
the processor is further configured to:
determine that reconfiguration of the backhaul link is necessary to avoid interference between the backhaul link and the access link; and
generate a request for the reconfiguration of the backhaul link,
the transceiver of the at least one backhaul STA is configured to:
transmit, to the corresponding AP of the AP MLD, a request for the reconfiguration of the backhaul link; and
receive, from the corresponding AP of the AP MLD, a response to the request that includes information on a new configuration for the backhaul link and an indication of a time to adopt the new configuration, and
the processor is further configured to instruct the at least one backhaul STA to adopt the new configuration at the indicated time.
6 . The MLD of claim 5 , wherein the processor is further configured to:
determine a desired channel configuration for the reconfiguration of the backhaul link, and
generate the request for the reconfiguration of the backhaul link to include the desired channel configuration.
7 . The MLD of claim 5 , wherein the processor is further configured to generate the request for the reconfiguration of the backhaul link to include a link identifier of the backhaul link and configuration information of the APs of the Mobile AP MLD.
8 . The MLD of claim 1 , wherein:
the processor is further configured to:
receive quality of service (QOS) expectations of a traffic flow corresponding to the traffic that flows through the Mobile AP MLD; and
generate a QoS characteristic element that includes the QoS expectations of the traffic flow and an indication that the traffic flow corresponds to the Mobile AP MLD, and
the transceiver of the at least one backhaul STA is configured to transmit, to the corresponding AP of the AP MLD, the QoS characteristic element.
9 . The MLD of claim 8 , wherein the processor is further configured to configure a direction subfield of the QOS characteristic element to indicate that the traffic flow corresponds to the Mobile AP MLD.
10 . The MLD of claim 1 , wherein the processor is further configured to:
determine whether the access link forms a non-simultaneous transmit/receive (NSTR) link pair with the backhaul link, and
based on a determination that the access link forms an NSTR link pair with the backhaul link, reconfigure the access link such that it does not form the NSTR link pair with the backhaul link.
11 . A method of a multi-link device (MLD), comprising:
instructing at least one access point (AP) of a plurality of APs forming a Mobile AP MLD to set up an access link with a corresponding station (STA) configured as a non AP STA of a non-AP MLD, the plurality of APs forming a primary link and a non-primary link with corresponding STAs of the non-AP MLD, each of the plurality of APs configured as an AP STA; and
instructing at least one backhaul STA of a plurality of backhaul STAs to set up a backhaul link with a corresponding AP configured as an AP STA of an AP MLD to carry traffic of the non-AP MLD that flows through the Mobile AP MLD over the access link, each of the plurality of backhaul STAs configured as a non-AP STA,
wherein the MLD comprises the plurality of APs forming the Mobile AP MLD and the plurality of backhaul STAs.
12 . The method of claim 11 , further comprising:
transmitting, from the at least one AP to the corresponding STA of the non-AP MLD, a capability indication that indicates availability of the at least one backhaul STA to form the backhaul link;
receiving, at the at least one AP from the corresponding STA of the non-AP MLD, a request to set up the backhaul link; and
instructing the at least one backhaul STA to set up the backhaul link in response to the received request.
13 . The method of claim 12 , wherein the capability indication is a reduced neighbor report element or a basic multi-link element.
14 . The method of claim 11 , further comprising transmitting, from the at least one backhaul STA to the corresponding AP of the AP MLD, an indication of information of the APs of the Mobile AP MLD for which the backhaul link carries traffic.
15 . The method of claim 11 , further comprising:
determining that reconfiguration of the backhaul link is necessary to avoid interference between the backhaul link and the access link;
transmitting, from the at least one backhaul STA to the corresponding AP of the AP MLD, a request for the reconfiguration of the backhaul link;
receiving, at the at least one backhaul STA from the corresponding AP of the AP MLD, a response to the request that includes information on a new configuration for the backhaul link and an indication of a time to adopt the new configuration; and
instructing the at least one backhaul STA to adopt the new configuration at the indicated time.
16 . The method of claim 15 , further comprising:
determining a desired channel configuration for the reconfiguration of the backhaul link,
wherein the request for the reconfiguration of the backhaul link includes the desired channel configuration.
17 . The method of claim 15 , wherein the request for the reconfiguration of the backhaul link includes a link identifier of the backhaul link and configuration information of the APs of the Mobile AP MLD.
18 . The method of claim 11 , further comprising:
receiving quality of service (QOS) expectations of a traffic flow corresponding to the traffic that flows through the Mobile AP MLD; and
transmitting, from the at least one backhaul STA to the corresponding AP of the AP MLD, a QoS characteristic element that includes the QOS expectations of the traffic flow and an indication that the traffic flow corresponds to the Mobile AP MLD.
19 . The method of claim 18 , further comprising configuring a direction subfield of the QoS characteristic element to indicate that the traffic flow corresponds to the Mobile AP MLD.
20 . The method of claim 11 , further comprising:
determining whether the access link forms a non-simultaneous transmit/receive (NSTR) link pair with the backhaul link; and
based on a determination that the access link forms an NSTR link pair with the backhaul link, reconfiguring the access link such that it does not form the NSTR link pair with the backhaul link.