Aggregation methods and systems for multi-user MIMO or OFDMA operation
In an example of multi-user wireless communications, an access point may send a downlink frame, including a first signaling field and a second signaling field, to multiple stations. The first and second signaling fields are located in a header of the downlink frame. The first signaling field indicates whether the downlink frame is associated with a multi-user (MU) multi-input multi-output (MIMO) transmission. The second signaling field includes an attribute of the MU-MIMO transmission or a non-MU-MIMO transmission. A resource unit of the downlink frame includes a MU-MIMO payload when the downlink frame is associated with the MU-MIMO transmission. A resource unit of the downlink frame includes a non-MU-MIMO payload when the downlink frame is associated with the non-MU-MIMO transmission. The stations may decode one or more portions of the downlink frame based on the attribute in the second signaling field. Other methods, apparatus, and computer-readable media are also disclosed.
1. A wireless device, comprising:
a processing device; and
a memory unit coupled to the processing device, wherein the memory unit includes instructions that when executed by the processing device cause the wireless device to:
set a more data field in a frame to be transmitted to a set of stations in a wireless network, the frame comprising multiple PLCP service data units (PSDUs) addressed to different stations, wherein the more data field indicates whether a first set of training fields are present in the frame;
add the first set of training fields to the frame in response to the more data field is set to a value of 1 and do not add the first set of training fields to the frame in response to the more data field is set to a value of 0; and
transmit the frame to the set of stations.
2. The wireless device of claim 1 , wherein the instructions, when executed by the processing device, further cause the wireless device to:
add a first set of data fields to the frame; and
add, in response to the more data field is set to the value of 1, a second set of data fields to the frame following the first set of data fields.
3. The wireless device of claim 2 , wherein the first set of training fields are located between the first set of data fields and the second set of data fields.
4. The wireless device of claim 3 , wherein the first set of training fields is a set of high efficiency long training fields that are to assist the set of stations perform physical layer processing on the frame.
5. The wireless device of claim 4 , wherein the instructions, when executed by the processing device, further cause the wireless device to:
add a second set of training fields to the frame, wherein the second set of training fields are the set of high efficiency long training fields.
6. The wireless device of claim 5 , wherein the second set of training fields are located in the frame before the first set of training fields.
7. The wireless device of claim 6 , wherein the first set of training fields, the first set of data fields, and the second set of data fields are located in a data portion of the frame and the second set of training fields are located in a preamble of the frame.
8. The wireless device of claim 6 , wherein a number of symbols for the first and second set of training fields is dependent on a number of spatial streams associated with a resource unit in which the first and second set of training fields are carried in the frame.
9. The wireless device of claim 6 , wherein the first set of data fields is a same length as the second set of data fields.
10. The wireless device of claim 1 , wherein the more data field consists of a single bit and the value is one.
11. The wireless device of claim 1 , wherein the instructions, when executed by the processing device, further cause the wireless device to:
set a first signaling field of the frame to indicate whether the frame is part of a multi-user (MU)-multi-input multi-output (MIMO) transmission;
in response to the first signaling field is set to indicate the MU-MIMO transmission, setting one or more attributes of the MU-MIMO transmission in a second signaling field of the frame; and
when the first signaling field is set to indicate a transmission that is a non-MU-MIMO transmission, set one or more attributes of the non-MU-MIMO transmission in the second signaling field.
12. A wireless device, comprising:
a processing device; and
a memory unit coupled to the processing device, wherein the memory unit includes instructions that when executed by the processing device cause the wireless device to:
process a more data field in a frame received from a station in a wireless network, the frame comprising multiple PLCP service data units (PSDUs) addressed to different stations, wherein the more data field indicates whether a first set of training fields are present in the framed;
process a first set of data fields in the frame;
process the first set of training fields in the frame in response to the more data field is set to a value of 1 and do not process the first set of training fields in the frame in response to the more data field is set to a value of UM; and
process a second set of data fields in the frame in response to the more data field is set to the value of 1.
13. The wireless device of claim 12 , wherein the first set of training fields are located between the first set of data fields and the second set of data fields.
14. The wireless device of claim 13 , wherein the first set of training fields is a set of high efficiency long training fields that are to assist the wireless device to perform physical layer processing on the frame.
15. The wireless device of claim 14 , wherein the instructions, when executed by the processing device, further cause the wireless device to:
process a second set of training fields in the frame, wherein the second set of training fields are located in the frame before the first set of training fields, and wherein the second set of training fields are the set of high efficiency long training fields.
16. The wireless device of claim 15 , wherein the first set of training fields, the first set of data fields, and the second set of data fields are located in a data portion of the frame and the second set of training fields are located in a preamble of the frame.
17. The wireless device of claim 15 , wherein a number of symbols for the first and second set of training fields is dependent on a number of spatial streams associated with a resource unit in which the first and second set of training fields are carried in the frame.
18. The wireless device of claim 15 , wherein the first set of data fields is a same length as the second set of data fields.
19. The wireless device of claim 12 , wherein the more data field consists of a single bit and the value is one.
20. The wireless device of claim 12 , wherein the instructions, when executed by the processing device, further cause the wireless device to:
determine whether a first header field of the frame indicates a first type of transmission or a second type of transmission;
determine one or more attributes of the first type of transmission in a second header field of the frame in response to the first header field is determined to indicate the first type of transmission;
determine one or more attributes of the second type of transmission in the second header field of the frame in response to the first header field is determined to indicate the second type of transmission; and
process one or more portions of the frame based on the one or more attributes of the first type of transmission or the one or more attributes of the second type of transmission.