Multi-access point coordinated spatial reuse protocol and algorithm
An apparatus implemented in a master access point (AP) selects at least one basic service set (BSS) from one or more neighbor BSSs to form a spatial reuse group (SRG). The apparatus then performs coordinated spatial reuse (CSR) in the SRG with a set of overlapping basic service set (OBSS) power detection (PD) parameters.
1. A method, comprising:
receiving, by an apparatus implemented in a master access point (AP), a report on received power levels, a respective spatial reuse parameter (SRP), and a receiver sensitivity of each of one or more coordinated APs from each of one or more stations (STAs) associated with the master AP;
selecting, by the apparatus, a coordinated AP from the one or more coordinated APs; and
performing, by the apparatus, coordinated spatial reuse (CSR) transmissions in conjunction with the at least one coordinated AP,
wherein the selecting of the coordinated AP comprises selecting the coordinate AP due to:
at least one STA of the one or more STAs associated with the master AP observing low interference from the coordinated AP; and
the master AP causing low interference on a coordinated basic service set (BSS) associated with the coordinated AP.
2. The method of claim 1 , wherein the report further comprises a transmit (TX) power received from the one or more coordinated APs.
3. The method of claim 1 , wherein the selecting of the coordinated AP comprises selecting at least one of the one or more coordinated APs causing a lowest interference level among the one or more coordinated APs as detected by the one or more STAs based on the report received from each of the one or more STAs.
4. The method of claim 1 , wherein the performing of the CSR transmissions comprises performing coordinated uplink (UL) transmissions by:
transmitting, by the master AP to the coordinated AP, a list of one or more excluded STAs which would cause high interference to the master AP, thereby causing the coordinated AP to transmit an UL trigger to the at least one STA which is not in the list of one or more excluded STAs; and
receiving a triggered UL transmission from the at least one STA during a period of time in which the coordinated AP receives an UL transmission from at least one other STA associated with the coordinated AP.
5. The method of claim 4 , wherein the performing of the CSR transmissions further comprises:
informing the coordinated AP about a spatial reuse (SR) opportunity and an SRP of the master AP.
6. The method of claim 5 , wherein an acceptable interference level in the SRP is adjustable by the master AP as a tradeoff between interference and throughput for the BSS associated with the coordinated AP, and wherein the SRP of the master AP is used in transmit (TX) power control by each triggered STA in the coordinated BSS.
7. The method of claim 1 , further comprising:
measuring, by the apparatus, an interference level of each of the one or more coordinated APs,
wherein the selecting of the coordinated AP comprises selecting one of the one or more coordinated APs having a lowest interference level measured by the apparatus among the one or more coordinated APs.
8. The method of claim 7 , wherein the performing of the CSR transmissions comprises:
transmitting an uplink (UL) trigger to the at least one STA; and
receiving a triggered UL transmission from the at least one STA during a period of time in which the coordinate AP performs a downlink (DL) transmission to at least one STA associated with the coordinated AP.
9. The method of claim 1 , further comprising:
measuring, by the apparatus, an interference level of each of the one or more coordinated APs,
wherein the selecting of the coordinated AP comprises selecting one of the one or more coordinated APs having a measured lowest interference level measured by the apparatus among the one or more coordinated APs as well as a reported lowest interference level among the one or more coordinated APs based on a respective report received from the at least one STA.
10. The method of claim 9 , wherein the performing of the CSR transmissions comprises performing a downlink (DL) transmission to the at least one STA during a period of time in which the coordinated AP transmits an uplink (UL) trigger to, and receives an UL transmission from, at least one STA associated with the coordinated AP.
11. An apparatus implementable in a master access point (AP), comprising:
a transceiver configured to communicate wirelessly; and
a processor coupled to the transceiver and configured to perform operations comprising:
receiving, via the transceiver, a report on received power levels, a respective spatial reuse parameter (SRP), and a receiver sensitivity of each of one or more coordinated APs from each of one or more stations (STAs) associated with the master AP;
selecting a coordinated AP from the one or more coordinated APs; and
performing, via the transceiver, coordinated spatial reuse (CSR) transmissions in conjunction with the at least one coordinated AP,
wherein the selecting of the coordinated AP comprises selecting the coordinate AP due to:
at least one STA of the one or more STAs associated with the master AP observing low interference from the coordinated AP; and
the master AP causing low interference on a coordinated basic service set (BSS) associated with the coordinated AP.