Systems, methods and apparatuses for multiple access point (multi-AP) coordination in wireless local area networks (WLANs)
Methods and apparatuses are described herein for multiple AP coordination in wireless local area networks (WLANs). For example, a station (STA) may receive, from a first access points (APs), a probe response frame that includes one or more indicators indicating multiple AP operation capabilities of the first AP and a second AP. The STA may transmit, to at least one of the first AP or the second AP, a multiple AP association request frame that enables the first AP to be associated with the second AP for a multiple AP operation. The STA may receive, from the first AP, a first multiple AP association response frame indicating acceptance or rejection of the multiple AP operation with the first AP. The STA may receive, from the second AP, a second multiple AP association response frame indicating acceptance or rejection of the multiple AP operation with the second AP.
1. A method, comprising:
establishing, by a station (STA), a multi-access point (AP) communication session with a first AP and a second AP;
measuring, by the STA, parameters of a first communication received from the first AP and a second communication received from the second AP;
identifying, by the STA, membership of the STA in a communication group of a plurality of communication groups based on the measured parameters; and
providing, by the STA, an identification of the membership of the STA in the communication group to each of the first AP and second AP.
2. The method of claim 1 , wherein the first communication or the second communication comprises a null data packet (NDP) frame.
3. The method of claim 1 , wherein the first communication and the second communication are received at the same time.
4. The method of claim 1 , wherein the first communication and the second communication are received orthogonally or semi-orthogonally in time or frequency.
5. The method of claim 1 , wherein measuring the parameters of the first communication and the second communication further comprises measuring a received signal strength of each of the first communication and the second communication.
6. The method of claim 5 , further comprising determining whether a ratio of or a difference between the received signal strength from the first AP and the received signal strength from the second AP exceeds a threshold.
7. The method of claim 6 , wherein identifying membership of the STA in the communication group further comprises identifying that the STA is associated with a group allowed to use a plurality of resource units associated with the first AP, responsive to the determined ratio or difference exceeding the threshold.
8. The method of claim 7 , wherein identifying membership of the STA in the communication group further comprises identifying that the STA is not associated with a group allowed to use a plurality of resource units associated with the second AP, responsive to the determined ratio or difference exceeding the threshold.
9. The method of claim 7 , wherein identifying membership of the STA in the communication group further comprises identifying that the STA is a cell center STA for the first AP, responsive to the determined ratio or difference exceeding the threshold.
10. A station (STA) comprising:
one or more transceivers configured to establish a multi-access point (AP) communication session with a first AP and a second AP; and
one or more processors configured to:
measure parameters of a first communication received from the first AP and a second communication received from the second AP, and
identify membership of the STA in a communication group of a plurality of communication groups based on the measured parameters; and
wherein the one or more transceivers are further configured to provide an identification of the membership of the STA in the communication group to each of the first AP and second AP.
11. The STA of claim 10 , wherein the first communication or the second communication comprises a null data packet (NDP) frame.
12. The STA of claim 10 , wherein the first communication and the second communication are received at the same time.
13. The STA of claim 10 , wherein the first communication and the second communication are received orthogonally or semi-orthogonally in time or frequency.
14. The STA of claim 10 , wherein the one or more processors are further configured to measure a received signal strength of each of the first communication and the second communication.
15. The STA of claim 14 , wherein the one or more processors are further configured to determine whether a ratio of or a difference between the received signal strength from the first AP and the received signal strength from the second AP exceeds a threshold.
16. The STA of claim 15 , wherein the one or more processors are further configured to identify that the STA is associated with a group allowed to use a plurality of resource units associated with the first AP, responsive to the determined ratio or difference exceeding the threshold.
17. The STA of claim 16 , wherein the one or more processors are further configured to identify that the STA is not associated with a group allowed to use a plurality of resource units associated with the second AP, responsive to the determined ratio or difference exceeding the threshold.
18. The STA of claim 16 , wherein the one or more processors are further configured to identify that the STA is a cell center station for the first AP, responsive to the determined ratio or difference exceeding the threshold.
19. A method for coordinated orthogonal frequency-division multiple access (OFDMA) transmission, the method comprising:
transmitting, by a first access point (AP) to a plurality of stations (STAs) engaged in a multi-AP communication session with the first AP and a second AP, a cell center/cell edge discovery communication;
receiving, by the first AP from each of the plurality of STAs, an identification of the respective STA as associated with a cell center or cell edge for the first AP; and
responsive to receipt of the identifications:
communicating, by the first AP, with one or more STAs associated with the cell center using a first group of resource units, and
communicating, by the first AP, with one or more STAs associated with the cell edge using a second group of resource units;
wherein a number of resource units of the first group exceeds a number of resource units of the second group.
20. The method of claim 19 , wherein transmitting the cell center/cell edge discovery communication further comprises transmitting, by the first AP, the cell center/cell edge discovery communication orthogonally or semi-orthogonally in time or frequency with a cell center/cell edge discovery communication transmitted by the second AP.