| CPC H04W 72/044 (2013.01) [H04L 1/00 (2013.01); H04W 28/065 (2013.01); H04W 72/04 (2013.01); H04W 74/006 (2013.01); H04W 84/12 (2013.01); H04L 1/0075 (2013.01); H04W 88/08 (2013.01)] | 18 Claims |

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1. A method performed by a device, the method comprising:
setting a first duration field included in a signal A (SIG A) field of a physical layer protocol data unit (PPDU); and
transmitting the PPDU,
wherein the first duration field in the SIG A field comprises at least one bit and at least one remaining bit,
wherein the at least one bit is followed by the at least one remaining bit in the SIG A field,
wherein a bit length of the first duration field in the SIG A field of the PPDU is smaller than a bit length of a second duration field in a medium access control (MAC) header of the PPDU,
wherein the at least one bit and the at least one remaining bit of the first duration field are related to a transmission opportunity (TXOP) duration,
wherein the at least one bit indicates that the TXOP duration is based on a time unit of X microseconds,
wherein X is a positive integer, and
wherein the at least one remaining bit is set based on the TXOP duration.
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