Transmission opportunity (txop) duration field disable setting in high efficiency signal a (he-sig-a)

A method performed by a wireless device, the method comprising:

• decoding a high efficiency (HE) physical-layer convergence procedure (PLCP) protocol data unit (PPDU) received from a second wireless device, the HE PPDU comprising a first transmission opportunity (TXOP) duration field in a physical-layer (PHY) portion of the HE PPDU;
• determining the first TXOP duration field does not comprise a disable flag indicating absence of duration information in the TXOP duration field, the determining based on bit values of the first TXOP duration field not being equal;
• and
• upon detecting absence of the disable flag, encoding a response HE PPDU for transmission to the second wireless device, the response HE PPDU comprising a second TXOP duration field within a PHY portion of the response HE PPDU, the second TXOP duration field without the disable flag.

A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors, the instructions to configure the one or more processors to cause an apparatus of a wireless device to:

• encode a high efficiency (HE) physical-layer convergence procedure (PLCP) protocol data unit (PPDU), wherein:
• the HE PPDU includes a transmission opportunity (TXOP) duration field in a physical-layer (PHY) portion of the HE PPDU, without including a media access control (MAC) duration field in a MAC-layer portion of the HE PPDU;
• and
• the TXOP duration field includes a disable flag based on equal bit values of the TXOP duration field, the disable flag indicating absence of duration information in the TXOP duration field;
• and
• configure the wireless device to transmit the HE PPDU to another wireless device.