Orthogonal multiplexing of high efficiency (HE) and extremely high throughput (EHT) wireless traffic
This disclosure provides systems, methods, apparatus, including computer programs encoded on computer storage media for orthogonal multiplexing of high efficiency (HE) and extremely high throughput (EHT) wireless traffic. Devices in a wireless local area network (WLAN) may operate under HE or EHT conditions. An access point (AP) may support both HE and EHT communications with WLAN devices. To enable substantially simultaneous downlink HE and EHT transmissions and substantially simultaneous uplink HE and EHT transmissions, the AP may support orthogonal frequency-division multiple access (OFDMA) of HE and EHT transmissions. For example, pre-HE and pre-EHT modulated fields, HE and EHT modulated fields, and payloads may be aligned in time for the HE and EHT transmissions. The AP may ensure orthogonality for multiplexing the HE and EHT transmissions based on the alignment. In some implementations, a trigger frame may be utilized to indicate uplink transmission alignments.
1. An apparatus for wireless communications, comprising:
a processing system; and
an interface, wherein the processing system is configured to:
output, via the first interface, a trigger frame that indicates one or more common information fields and one or more per-user information fields;
obtain, via the first interface, a first protocol data unit via a first resource unit of two or more resource units allocated by the trigger frame based at least in part on the one or more common information fields and the one or more per-user information fields, the first protocol data unit comprising a first set of fields and a second set of fields; and
obtain, via the first interface, a second protocol data unit via a second resource unit of the two or more resource units based at least in part on the one or more common information fields and the one or more per-user information fields, wherein the second protocol data unit comprises a third set of fields that are aligned in time with the first set of fields and a fourth set of fields that are aligned in time with the second set of fields.
2. The apparatus of claim 1 , wherein the one or more common information fields comprise high efficiency (HE) signal A (SIG-A) reserved fields that indicate common information for extremely high throughput (EHT) communications.
3. The apparatus of claim 1 , wherein a symbol boundary alignment between the first protocol data unit and the second protocol data unit maintains orthogonality between the first protocol data unit and the second protocol data unit.
4. The apparatus of claim 1 , wherein the first protocol data unit comprises a first trigger-based uplink physical protocol data unit (PPDU) and the second protocol data unit comprises a second trigger-based uplink PPDU.
5. The apparatus of claim 1 , wherein the first protocol data unit and the second protocol data unit comprise a same number of long training field symbols.
6. The apparatus of claim 1 , wherein the first protocol data unit and the second protocol data unit comprise a same number of short training fields.
7. The apparatus of claim 1 , wherein the one or more common information fields indicate a number of long training fields in one or both of the first protocol data unit or the second protocol data unit, a long training field duration for one or both of the first protocol data unit or the second protocol data unit, a guard interval (GI) duration for one or both of the first protocol data unit or the second protocol data unit, or a combination thereof.
8. The apparatus of claim 1 , wherein one or both of the first protocol data unit or the second protocol data unit comprise a set of padding bits that maintain a payload alignment between the first protocol data unit and the second protocol data unit.
9. The apparatus of claim 1 , wherein the first protocol data unit and the second protocol data unit comprise a same guard interval (GI).
10. The apparatus of claim 1 , wherein a bandwidth of the first protocol data unit is equal to a bandwidth of the second protocol data unit.
11. The apparatus of claim 1 , wherein a bandwidth of the first protocol data unit is different from a bandwidth of the second protocol data unit.
12. The apparatus of claim 1 , wherein the one or more per-user information fields indicate a resource unit allocation index, and wherein the first resource unit for reception of the first protocol data unit is associated with the resource unit allocation index.
13. The apparatus of claim 1 , wherein the one or more per-user information fields indicate spatial streams to use for reception of the first protocol data unit and the second protocol data unit.
14. An access point (AP), comprising:
a processing system configured to output a trigger frame; and
a transceiver configured to:
transmit the trigger frame that indicates one or more common information fields and one or more per user information fields;
receive a first protocol data unit via a first resource unit of two or more resource units allocated by the trigger frame based at least in part on the one or more common information fields and the one or more per user information fields, the first protocol data unit comprising a first set of fields and a second set of fields; and
receive a second protocol data unit via a second resource unit of the two or more resource units based at least in part on the one or more common information fields and the one or more per user information fields, wherein the second protocol data unit comprises a third set of fields that are aligned in time with the first set of fields and a fourth set of fields that are aligned in time with the second set of fields.
15. The AP of claim 14 , wherein the one or more common information fields comprise high efficiency (HE) signal A (SIG-A) reserved fields that indicate common information for extremely high throughput (EHT) communications.
16. The AP of claim 14 , wherein at least one of:
a symbol boundary alignment between the first protocol data unit and the second protocol data unit maintains orthogonality between the first protocol data unit and the second protocol data unit; or
the first protocol data unit and the second protocol data unit are obtained according to different Institute of Electrical and Electronics Engineers (IEEE) 802.11 versions.
17. The AP of claim 14 , wherein the first protocol data unit comprises a first trigger-based uplink physical protocol data unit (PPDU) and the second protocol data unit comprises a second trigger-based uplink PPDU.
18. The AP of claim 14 , wherein the first protocol data unit and the second protocol data unit comprise a same number of long training field symbols.
19. The AP of claim 14 , wherein the one or more common information fields indicate a number of long training fields in one or both of the first protocol data unit or the second protocol data unit, a long training field duration for one or both of the first protocol data unit or the second protocol data unit, a guard interval (GI) duration for one or both of the first protocol data unit or the second protocol data unit, or a combination thereof.
20. A method for wireless communications at an access point (AP), comprising:
outputting a trigger frame that indicates one or more common information fields and one or more per-user information fields;
obtaining a first protocol data unit via a first resource unit of two or more resource units allocated by the trigger frame based at least in part on the one or more common information fields and the one or more per-user information fields, the first protocol data unit comprising a first set of fields and a second set of fields; and
obtaining a second protocol data unit via a second resource unit of the two or more resource units based at least in part on the one or more common information fields and the one or more per-user information fields, wherein the second protocol data unit comprises a third set of fields that are aligned in time with the first set of fields and a fourth set of fields that are aligned in time with the second set of fields.