| CPC H04L 27/2615 (2013.01) [H04W 28/065 (2013.01); H04W 84/12 (2013.01)] | 14 Claims |

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1. A communication device for transmitting a physical layer protocol data unit, PPDU, to one or more receiving devices, wherein the communication device comprises:
a processor configured to:
receive a trigger frame in a first PPDU;
obtain a sequence of disregard bits of a universal signal, U-SIG, field in the first PPDU, wherein the sequence of disregard bits comprises at least one bit set to 0; and
copy the sequence of disregard bits into the U-SIG field of a second PPDU; and
a transmitter configured to transmit the second PPDU, wherein the second PPDU comprises the sequence of disregard bits.
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