Null data packet announcement (NDPA) frame indication
The present disclosure provides methods and apparatus related to NDPA frame indication. An aspect of the disclosure provides a method. The method includes sending, to one or more stations (STAs), a request for channel state information (CSI). The request includes a null data packet announcement (NDPA) frame including a first field and a second field. The first field indicates presence of the second field, and the second field indicates a variant of the NDPA frame. The method further includes receiving, from the one or more STAs, a CSI feedback response based on the request. In some embodiments, the first field is one of a sounding dialog token field and indicates the presence of the second field via at least two bits. In some embodiments, the first field is a frame control field and indicates the second field via a 4-bit subtype subfield.
1. An apparatus comprising:
at least one processor and at least one machine-readable medium storing executable instructions which when executed by the at least one processor configure the apparatus for:
sending, to one or more stations (STAs), a request for channel state information (CSI), the request comprising both a null data packet announcement (NDPA) frame and a null data packet (NDP), the NDPA frame including a first field and a second field, the first field comprising one or more bits set to indicate presence of the second field, the second field being separate from the first field and indicating a variant of the NDPA frame; and
receiving, from the one or more STAs, a CSI feedback response based on the request.
2. The apparatus of claim 1 , wherein the first field is a sounding dialog token field.
3. The apparatus of claim 2 , wherein the sounding dialog token field indicates the presence of the second field via at least two bits.
4. The apparatus of claim 1 , wherein the second field further indicates one or more of: NDPA version information, a sensing announcement frame, a vendor specific NDPA, information exchange frames among collaborated APs, and sounding dialog token number information.
5. The apparatus of claim 1 , wherein some bits of the second field are reserved for indicating information common to recipient STAs.
6. The apparatus of claim 1 , wherein one bit of the second field is reserved for indicating an extension of the second field.
7. The apparatus of claim 1 , wherein the 11 th bit of the second field is set to a disambiguation subfield.
8. The apparatus of claim 1 , wherein the first field is a frame control field.
9. The apparatus of claim 8 , wherein the frame control field indicates the second field via a 4-bit subtype subfield.
10. The apparatus of claim 9 , wherein the second field indicates one or more of: the variant of the NDPA frame and sounding dialog token number information.
11. The apparatus of claim 10 , wherein:
the second field comprises a first subfield and a second subfield;
the first subfield indicates the variant of the NDPA frame; and
the second subfield indicates the sounding dialog token number information.
12. A non-transitory computer-readable medium storing executable instructions which when executed by a processor of a device configure the device for:
sending, to one or more stations (STAs), a request for channel state information (CSI), the request comprising both a null data packet announcement (NDPA) frame and a null data packet (NDP), the NDPA frame including a first field and a second field, the first field comprising one or more bits set to indicate presence of the second field, the second field being separate from the first field and indicating a variant of the NDPA frame; and
receiving, from the one or more STAs, a CSI feedback response based on the request.
13. The non-transitory computer-readable medium of claim 12 , wherein the first field is a sounding dialog token field.
14. The non-transitory computer-readable medium of claim 13 , wherein the sounding dialog token field indicates the presence of the second field via at least two bits.
15. The non-transitory computer-readable medium of claim 12 , wherein the second field further indicates one or more of: NDPA version information, a sensing announcement frame, a vendor specific NDPA, information exchange frames among collaborated APs, and sounding dialog token number information.
16. The non-transitory computer-readable medium of claim 12 , wherein some bits of the second field are reserved for indicating information common to recipient STAs.
17. The non-transitory computer-readable medium of claim 12 , wherein one bit of the second field is reserved for indicating an extension of the second field.
18. The non-transitory computer-readable medium of claim 12 , wherein the 11 th bit of the second field is set to a disambiguation subfield.
19. The non-transitory computer-readable medium of claim 12 , wherein the first field is a frame control field.
20. The non-transitory computer-readable medium of claim 19 , wherein the frame control field indicates the second field via a 4-bit subtype subfield.
21. The non-transitory computer-readable medium of claim 20 , wherein the second field indicates one or more of: the variant of the NDPA frame and sounding dialog token number information.
22. The non-transitory computer-readable medium of claim 21 , wherein:
the second field comprises a first subfield and a second subfield;
the first subfield indicates the variant of the NDPA frame; and
the second subfield indicates the sounding dialog token number information.