Systems and methods for multi-user resource assignments
In an example of multi-user wireless communications, an access point may send a downlink frame, including a common field and a user specific field, to multiple stations. The common field and the user specific field are located in a header field called a high efficiency signal-B (HE SIG-B) field. The common field includes information for all of the stations. The user specific field includes multiple sub-fields. At least one of the multiple sub-fields is for each of the stations. The stations may decode their respective portions of the downlink frame based on the common field and their respective sub-field(s). Some or all of the stations may generate and transmit their respective uplink frames, for multi-user transmission such as OFDMA, based on the common field and their respective sub-field(s) included in the downlink frame. The downlink frame may be a trigger frame. Other methods, apparatus, and computer-readable media are also disclosed.
1. An apparatus for facilitating wireless communication, the apparatus comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors configured to cause:
determining a common field and at least one sub-field of a user specific field based on a downlink frame, wherein the common field and the user specific field are located in a first header field of the downlink frame, wherein the common field includes information for a plurality of stations, wherein the at least one sub-field includes information specific to one of the plurality of stations, wherein the downlink frame further comprises a first full-band physical layer convergence procedure (PLCP) service data unit (PSDU) interposed between the first header field and a second header field of the downlink frame and a second PSDU following the second header field, and wherein the first full-band PSDU occupies a full-band region of a corresponding bandwidth and the second PSDU occupies a sub-band region of the corresponding bandwidth;
decoding one or more portions of the downlink frame based on the common field and the at least one sub-field;
providing the decoded one or more portions of the downlink frame for processing; and
transmitting, by the apparatus to an access point, a radio frequency (RF) signal carrying an uplink frame at one or more sub-band assignments based on the decoded one or more portions of the downlink frame,
wherein the first header field comprises first attributes for the first full-band PSDU and second attributes for the second PSDU, wherein the first attributes indicate a number of symbols that the first full-band PSDU occupies in the full-band region, and wherein the second attributes indicate which sub-bands of the corresponding bandwidth are occupied by the second PSDU.
2. The apparatus of claim 1 , wherein the first header field is a high efficiency signal-B (HE SIG-B) field.
3. The apparatus of claim 1 , wherein the common field comprises resource unit allocation.
4. The apparatus of claim 3 , wherein the resource unit allocation is associated with the plurality of stations for downlink Orthogonal Frequency Division Multiple Access (OFDMA) or multiuser MIMO (MU-MIMO) or both.
5. The apparatus of claim 4 , wherein the at least one sub-field includes at least one of a modulation and coding scheme (MCS), an association identifier (AID), coding information, a number of space-time streams (NSTS), a space-time block coding (STBC), and single-user (SU) beamformed information which is specific to the one of the plurality of stations for downlink OFDMA.
6. The apparatus of claim 1 , wherein the plurality of stations are stations designated to receive the downlink frame in the corresponding bandwidth.
7. The apparatus of claim 1 , wherein the common field is followed by the user specific field.
8. The apparatus of claim 1 , wherein the user specific field consists of multiple sub-fields that are not part of the common field.
9. The apparatus of claim 8 , wherein each of the plurality of stations is assigned to at least one of the multiple sub-fields.
10. The apparatus of claim 9 , wherein the plurality of stations are stations designated to receive the downlink frame.
11. A non-transitory computer-readable storage medium storing computer-executable instructions that, when executed by one or more processors, cause one or more processors to perform operations, the operations comprising:
generating a frame for a multi-user transmission, the frame comprising a common field and a user specific field, wherein the common field and the user specific field are located in a first header field of the frame, wherein the common field includes information for a plurality of stations, wherein the user specific field comprises multiple sub-fields, wherein each of the plurality of stations is assigned to at least one of the multiple sub-fields, wherein the frame further comprises a first full-band physical layer convergence procedure (PLCP) service data unit (PSDU) interposed between the first header field and a second header field of the frame and a second PSDU following the second header field, wherein the first full-band PSDU occupies a full-band region of a corresponding bandwidth and the second PSDU occupies a sub-band region of the corresponding bandwidth, wherein the first header field comprises first attributes for the first full-band PSDU and second attributes for the second PSDU, wherein the first attributes indicate a number of symbols that the first full-band PSDU occupies in the full-band region, and wherein the second attributes indicate which sub-bands of the corresponding bandwidth are occupied by the second PSDU; and
providing the frame for the multi-user transmission to the plurality of stations, the frame eliciting a response from at least one of the plurality of stations at one or more sub-band assignments based on the common field and the user specific field.
12. The non-transitory computer-readable storage medium of claim 11 , wherein each of the multiple sub-fields comprises at least one of a modulation and coding scheme (MCS), an association identifier (AID), coding information, a number of space-time streams (NSTS), a space-time block coding (STBC), and single-user (SU) beamformed information.
13. The non-transitory computer-readable storage medium of claim 11 , wherein the multiple sub-fields are placed in a predetermined order of a sequence based on a sub-band index.
14. The non-transitory computer-readable storage medium of claim 11 , wherein the multiple sub-fields are placed in an order of an increasing frequency sequence or a decreasing frequency sequence as the common field indicates.
15. The non-transitory computer-readable storage medium of claim 11 , wherein the common field is followed by a first one of the multiple sub-fields, wherein the first one is followed by a second one of the multiple sub-fields, and wherein the second one is followed by a third one of the multiple sub-fields.
16. The non-transitory computer-readable storage medium of claim 11 , wherein the frame further comprises a full-band PSDU attribute field including at least one of an identifier (ID), a modulation and coding scheme (MCS), coding information, a space-time block coding (STBC), and length and number of OFDM symbols that the first full-band PSDU occupies.
17. A computer-implemented method of facilitating wireless communication, the method comprising:
processing a received trigger frame, the received trigger frame comprising a common field and at least one sub-field of a user specific field located in a first header field of the received trigger frame, wherein the common field includes information for a plurality of stations, wherein the at least one sub-field is for one of the plurality of stations, wherein the received trigger frame further comprises a first full-band physical layer convergence procedure (PLCP) service data unit (PSDU) interposed between the first header field and a second header field of the received trigger frame and a second PSDU following the second header field, wherein the first full-band PSDU occupies a full-band region of a corresponding bandwidth and the second PSDU occupies a sub-band region of the corresponding bandwidth, wherein the first header field comprises first attributes for the first full-band PSDU and second attributes for the second PSDU, wherein the first attributes indicate a number of symbols that the first full-band PSDU occupies in the full-band region, and wherein the second attributes indicate which sub-bands of the corresponding bandwidth are occupied by the second PSDU;
generating, in response to the received trigger frame, an uplink frame, the uplink frame being generated based on the common field and the at least one sub-field; and
providing, for transmission, a radio frequency (RF) signal carrying the uplink frame at one or more sub-band assignments based on the common field and the at least one sub-field.
18. The computer-implemented method of claim 17 , wherein the common field and the user specific field are located in a payload section of the received trigger frame.
19. The apparatus of claim 1 , wherein the one or more processors are configured to further cause:
receiving, by the apparatus from the access point, a second RF signal carrying the downlink frame including a first header field and a second header field immediately following the first header field.
20. The apparatus of claim 19 , wherein a modulation and coding scheme (MCS) used for encoding the second header field is indicated in the first header field.
21. The apparatus of claim 20 , wherein:
the common field includes information on where data units of the plurality of stations are located, and
information specific to one of the plurality of stations includes an identifier and a MCS for the one of the plurality of stations.
22. The apparatus of claim 1 , wherein the information of the common field indicates which of a plurality of sub-bands of the corresponding bandwidth are occupied sub-bands and empty sub-bands.
23. The apparatus of claim 22 , wherein the at least one sub-field excludes information for the empty sub-bands.
24. The apparatus of claim 1 , wherein the downlink frame comprises one or more of a set of high efficiency long training field (HE LTF) symbols or high efficiency short training field (HE STF) symbols that precede the first full-band PSDU and are not beamformed.
25. The non-transitory computer-readable storage medium of claim 11 , wherein the frame comprises one or more of a set of high efficiency long training field (HE LTF) symbols or high efficiency short training field (HE STF) symbols that follow the first full-band PSDU and are not beamformed.
26. The computer-implemented method of claim 17 , wherein the received trigger frame comprises one or more of a set of high efficiency long training field (HE LTF) symbols or high efficiency short training field (HE STF) symbols that precede the first full-band PSDU and are not beamformed.