Techniques for multi-access point joint sounding
The present disclosure relates to a network device for announcing a multi-access point (M-AP), joint channel sounding procedure in a WiFi network for acquiring channel state information between multiple access points (APs), which belong to a same M-AP set, and multiple stations associated with at least one of those multiple APs, wherein the network device is an access point of a subset of the M-AP set which subset includes APs that are configured to transmit an announcement frame, the network device comprising: a processor configured to provide the announcement frame of the M-AP joint channel sounding procedure, wherein the announcement frame comprises an identification of the M-AP set and identifications of the APs, associated to the subset of the M-AP set which subset of APs is configured to transmit the announcement frame; and a transceiver configured to transmit the announcement frame.
1 . A network device for announcing a multi-access point (M-AP) Joint channel sounding procedure in a WiFi network for acquiring channel state information (CSI), between multiple access points (APs) that belong to a same M-AP set, and multiple stations (STAs) associated with at least one of the multiple APs, wherein the network device is an AP of a subset of the M-AP set, which subset includes APs that are configured to transmit an announcement frame, the network device comprising:
a processor; and
a memory including computer executable instructions that, when executed by the processor, facilitate the network device carrying out a method comprising providing the announcement frame of the M-AP Joint channel sounding procedure,
wherein the announcement frame comprises:
an identification of the M-AP set; and
identifications of the APs (AP IDs) associated to the subset of the M-AP set, which subset of APs is configured to transmit the announcement frame.
2 . The network device of claim 1 , wherein the announcement frame is a Joint Null Data Packet Announcement (Joint NDPA) frame of a new frame type that is different from existing NDPA frame types according to IEEE 802.11be.
3 . The network device claim 2 , wherein the Joint NDPA frame is transmitted on same time-frequency resources with same payload information by all APs belonging to the subset of the M-AP set, and
wherein the subset is configured to transmit the announcement frame.
4 . The network device of claim 1 , wherein the announcement frame comprises an indication of a broadcast transmitter address (TA).
5 . The network device of claim 1 , wherein the announcement frame comprises:
an M-AP Set Info Subblock including information about the M-AP set; and
a plurality of STA Info Subblocks indicating sounding parameters requested by one or more specific APs of the M-AP set from one or more specific STAs of the multiple STAs.
6 . The network device of claim 5 , wherein the M-AP Set Info Subblock comprises:
the identification of the M-AP set (M-AP set ID); and
the AP IDs belonging to the subset of the M-AP set,
wherein the subset is configured to transmit the announcement frame.
7 . The network device of claim 6 , wherein the M-AP Set Info Subblock comprises:
a quantity of APs transmitting the announcement frame of the M-AP Joint channel sounding procedure.
8 . The network device of claim 6 , wherein the M-AP Set Info Subblock comprises:
a space time stream (STS) indication for all APs belonging to the subset of the M-AP set.
9 . The network device of claim 8 , wherein the STS indication comprises:
an indication of a first STS allocated to a respective AP of the APs belonging to the subset of the M-AP set, and
a quantity of STSs allocated to the respective AP.
10 . The network device of claim 5 , wherein each STA Info Subblock of the plurality of STA Info Subblocks indicates only one STA and one or more APs.
11 . The network device of claim 5 , wherein each STA Info Subblock of the plurality of STA Info Subblocks indicates sounding parameters as requested by one or more APs from a specific STA.
12 . The network device of claim 5 , wherein each specific STA Info Subblock of the plurality of STA Info Subblocks comprises a quantity of AP Info Subfields indicating a quantity of APs that request sounding parameters from a specific STA indicated by a specific one of the each specific STA Info Subblock.
13 . The network device of claim 5 , wherein each specific STA Info Subblock of the plurality of STA Info Subblocks comprises an AP Info Subfield,
wherein the AP Info Subfield comprises:
an indication of a specific AP of the M-AP set which requests the sounding parameters from the specific STA, and
the sounding parameters requested by the specific AP.
14 . The network device of claim 5 , wherein each STA Info Subblock of the plurality of STA Info Subblocks comprises an indication format bit for indicating whether all APs that request sounding parameter from the specific STA request the same sounding parameters.
15 . The network device of claim 5 , wherein each STA Info Subblock of the plurality of STA Info Subblocks indicates sounding parameters as requested by a specific AP of the M-AP set from multiple STAs that are associated with the specific AP.
16 . The network device of claim 5 , wherein a STA Info Subblock of the plurality of STA Info Subblocks comprises an AP Info Subfield, the AP Info Subfield comprising:
an indication of a specific AP of the M-AP set which requests the sounding parameters,
an indication of a specific AP of the M-AP set with which the one or more specific STAs of the multiple STAs are associated with, and
a quantity of STA Info Subfields included in the AP Info Subfield.
17 . The network device of claim 16 , wherein the STA Info Subblock comprises a plurality of STA Info Subfields according to the quantity of STA Info Subfields included in the AP Info Subfield.
18 . A method for announcing a Multi-Access Point (M-AP) Joint channel sounding procedure in a WiFi network for acquiring channel state information (CSI) between multiple Access Points (APs) that belong to a same M-AP set, and multiple stations (STAs) associated with at least one of those multiple APs, the method comprising:
providing an announcement frame of the M-AP Joint channel sounding procedure by a subset of the M-AP set which subset includes APs that are configured to transmit the announcement frame, wherein the announcement frame comprises:
an identification of the M-AP set (M-AP set ID), and
identifications of the APs (AP IDs) associated to the subset of the M-AP set, which subset of APs is configured to transmit the announcement frame.
19 . The method of claim 18 , comprising:
transmitting the announcement frame on the same time-frequency resources with the same payload information by all APs belonging to the subset of the M-AP set which subset is configured to transmit the announcement frame.
20 . A station (STA) comprising:
a transceiver configured to receive an announcement frame for announcing a multi-access point (M-AP) Joint channel sounding procedure in a WiFi network for acquiring channel state information (CSI) between multiple access point (APs), which belong to a same M-AP set, and multiple stations (STAs) associated with at least one of the multiple APs, wherein the announcement frame is received from an AP of a subset of the M-AP set, which subset includes APs that are configured to transmit the announcement frame; and
a processor configured to determine, based on the announcement frame:
an identification of the M-AP set (M-AP set ID), and
identifications of the APs (AP IDs) associated to the subset of the M-AP set, which subset of APs is configured to transmit the announcement frame.