Physical layer protocol data unit format including padding in a high efficiency wireless lan

A wireless device comprising:

• a transmitter;
• and
• a receiver,
• wherein the wireless device is configured to:
• receive, using the receiver, a trigger frame from an access point (AP) of a Wireless Local Area Network (WLAN), the trigger frame allocating a plurality of subchannels to the wireless device and one or more other wireless devices and indicating a length of an uplink (UL) multi-user (MU) Physical layer Protocol Data Unit PPDU;
• generate, for a subchannel allocated to the STA, a Media Access Control (MAC) Protocol Data Unit (MPDU) fragment having au MPDU fragment length;
• and
• transmit, to the AP using the transmitter, a PPDU frame including the MPDU fragment in a transmission on the subchannel allocated to the STA,
• wherein the MPDU fragment length is determined such that the transmission on the subchannel allocated to the STA and transmissions on one or more other sub-channels respectively allocated to the one or more other STAs end simultaneously,
• wherein the PPDU is included in an Orthogonal Frequency Division Multiple Access (OFDMA) UL MU transmission, and
• wherein generating the MPDU fragment comprises dividing a first Aggregated MPDU (A-MPDU) subframe into a plurality of fragments, and including a first fragment of the plurality of fragments divided from the first A-MPDU subframe in the MPDU fragment.