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 for use in an IEEE 802.11 station (STA), the method comprising:
receiving, from a first access point (AP), a probe response frame including one or more indicators indicating multiple AP operation capabilities of the first AP and a second AP, wherein the first AP and the second AP are included in a multiple AP service set comprising a plurality of APs that are able to support a multiple AP operation;
transmitting, to at least one of the first AP or the second AP, a multiple AP association request frame for the multiple AP operation with the IEEE 802.11 STA, wherein the multiple AP operation includes reception of signals by the IEEE 802.11 STA from the first AP and the second AP;
receiving, from the first AP, based on a predetermined order in the multiple AP service set, a first multiple AP association response frame that indicates acceptance or rejection of the multiple AP operation with the first AP; and
receiving, from the second AP, based on the predetermined order in the multiple AP service set, a second multiple AP association response frame that indicates acceptance or rejection of the multiple AP operation with the second AP.
2. The method of claim 1 , wherein the multiple AP operation capabilities comprise a multiple AP joint transmission capability, a multiple AP hybrid automatic repeat request (HARQ) capability, a multiple AP multiple-input multiple-output (MIMO) capability, a dynamic AP selection capability, a multiple AP roaming capability, or a multiple AP coordinated beamforming capability.
3. The method of claim 1 , further comprising:
receiving a second probe response frame from the second AP, wherein on a condition that the first AP and the second AP are not in a same multiple AP service set, the first probe response frame includes one or more indicators indicating multiple AP operation capabilities of a plurality of APs in a first multiple AP service set associated with the first AP, and wherein the second probe response frame includes one or more indicators indicating multiple AP operation capabilities of a plurality of APs in a second multiple AP service set associated with the second AP.
4. The method of claim 1 , further comprising:
transmitting a probe request frame including an indication that the IEEE 802.11 STA is able to support the multiple AP operation.
5. The method of claim 1 , further comprising:
on a condition that the first multiple AP association response frame is correctly decoded, transmitting, to the first AP, a first multiple AP association acknowledge (ACK) frame;
on a condition that the first multiple AP association response frame is not correctly decoded, transmitting, to the first AP, a first multiple AP association negative acknowledge (NACK) frame;
on a condition that the second multiple AP association response frame is correctly decoded, transmitting, to the second AP, a second multiple AP association ACK frame; and
on a condition that the second multiple AP association response frame is not correctly decoded, transmitting, to the second AP, a second multiple AP association NACK frame.
6. The method of claim 1 , further comprising:
on a condition that both the first and second multiple AP association response frames indicate acceptance, performing the multiple AP operation with the first AP and the second AP.
7. The method of claim 1 , wherein the multiple AP operation with the first AP and the second AP is performed using coordinated orthogonal frequency-division multiple access (OFDMA) or coordinated nulling.
8. The method of claim 1 , wherein the multiple AP operation includes simultaneous reception of signals by the IEEE 802.11 STA from the first AP and the second AP or simultaneous transmission of signals from the IEEE 802.11 STA to the first AP and the second AP.
9. An IEEE 802.11 station (STA) comprising:
a receiver configured to receive, from a first access point (AP), a probe response frame including one or more indicators indicating multiple AP operation capabilities of the first AP and a second AP, wherein the first AP and the second AP are included in a multiple AP service set comprising a plurality of APs that are able to support a multiple AP operation;
a transmitter configured to transmit, to at least one of the first AP or the second AP, a multiple AP association request frame for the multiple AP operation with the IEEE 802.11 STA, wherein the multiple AP operation includes reception of signals by the IEEE 802.11 STA from the first AP and second AP; and
the receiver further configured to:
receive, from the first AP, based on a predetermined order in the multiple AP service set, a first multiple AP association response frame that indicates acceptance or rejection of the multiple AP operation with the first AP; and
receive, from the second AP, based on the predetermined order in the multiple AP service set, a second multiple AP association response frame that indicates acceptance or rejection of the multiple AP operation with the second AP.
10. The IEEE 802.11 STA of claim 9 , wherein the multiple AP operation capabilities comprise a multiple AP joint transmission capability, a multiple AP hybrid automatic repeat request (HARQ) capability, a multiple AP multiple-input multiple-output (MIMO) capability, a dynamic AP selection capability, a multiple AP roaming capability, or a multiple AP coordinated beamforming capability.
11. The IEEE 802.11 STA of claim 9 , wherein the receiver is further configured to receive a second probe response frame from the second AP, wherein on a condition that the first AP and the second AP are not in a same multiple AP service set, the probe response frame includes one or more indicators indicating multiple AP operation capabilities of a plurality of APs in a first multiple AP service set associated with the first AP, and wherein the second probe response frame includes one or more indicators indicating multiple AP operation capabilities of a plurality of APs in a second multiple AP service set associated with the second AP.
12. The IEEE 802.11 STA of claim 9 , wherein the transmitter is further configured to transmit a probe request frame including an indication that the IEEE 802.11 STA is able to support the multiple AP operation.
13. The IEEE 802.11 STA of claim 9 , wherein the transmitter is further configured to:
on a condition that the first multiple AP association response frame is correctly decoded, transmit, to the first AP, a first multiple AP association acknowledge (ACK) frame;
on a condition that the first multiple AP association response frame is not correctly decoded, transmit, to the first AP, a first multiple AP association negative acknowledge (NACK) frame;
on a condition that the second multiple AP association response frame is correctly decoded, transmit, to the second AP, a second multiple AP association ACK frame; and
on a condition that the second multiple AP association response frame is not correctly decoded, transmit, to the second AP, a second multiple AP association NACK frame.
14. The IEEE 802.11 STA of claim 9 , wherein the transmitter and the receiver are further configured to perform, on a condition that both the first and second multiple AP association response frames indicate acceptance, the multiple AP operation with the first AP and the second AP.
15. The IEEE 802.11 STA of claim 9 , wherein the multiple AP operation with the first AP and the second AP is performed using coordinated orthogonal frequency-division multiple access (OFDMA) or coordinated nulling, and the multiple AP operation includes simultaneous reception of signals by the IEEE 802.11 STA from the first AP and the second AP or simultaneous transmission of signals from the IEEE 802.11 STA to the first AP and the second AP.