Five HE PPDU formats are defined: HE SU PPDU, HE MU PPDU, HE extended range SU PPDU and HE trigger-based PPDU, HE NDP PPDU.
The format of the HE SU PPDU is defined as in Figure 1 (HE SU PPDU format). This PPDU format is used for SU (Single User) transmission.
Figure 1. HE SU PPDU format
The format of the HE MU PPDU is defined as in Figure 2 (HE MU PPDU format). This format is used for transmission to one or more users that is not a response of a Trigger frame. The HE-SIG-B field is present in this format.
Figure 2. HE MU PPDU format
The format of the HE extended range SU PPDU is defined as in Figure 3 (HE extended range SU PPDU format). This format is used for outdoor SU transmission and, in this format, the HE-SIG-A field is repeated.
Figure 3. HE extended range SU PPDU format
The format of the HE trigger-based PPDU is defined as in Figure 4 (HE trigger-based PPDU format). This format is used for a transmission that is a response to a Trigger frame. The HE trigger-based PPDU format is identical to the HE SU PPDU format for the L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A fields. The duration of the HE-STF field is 8 μs.
Figure 4. HE Trigger based PPDU format
The format of the HE NDP PPDU is defined as in Figure 5 (HE NDP PPDU format).This format is used for DL Channel Sounding.
Figure 5. HE NDP PPDU format