PPDU transmission method and related apparatus

A method, comprising:

• receiving a physical layer protocol data unit (PPDU), wherein the PPDU comprises a data field, the data field comprises a first information subfield and a midamble subfield, the first information subfield is located before a first OFDM symbol corresponding to the midamble subfield, and the first information subfield comprises first data information;
• and
• parsing the PPDU to obtain the first data information, comprising:
• when it is identified that a value of a midamble indication subfield in a universal signal field (U-SIG) is a first value, ignoring the midamble indication subfield, and obtaining and parsing the first information subfield to obtain the first data information;
• or
• when it is identified that a value of a midamble indication subfield in the U-SIG is the first value, determining that the data field comprises the midamble subfield, obtaining a periodicity of a midamble based on a midamble periodicity indication subfield, obtaining, based on the periodicity of the midamble, the first information subfield that is located before the first OFDM symbol corresponding to the midamble subfield, and obtaining and parsing the first information subfield to obtain the first data information.

An apparatus, comprising:

• at least one processor, wherein the at least one processor is coupled to a memory, the memory stores computer instructions, and the at least one processor executes the computer instructions, to enable the apparatus to perform the following operations:
• generating a physical layer protocol data unit (PPDU) comprising a data field, wherein the data field comprises a first data field and a second data field;
• and
• sending the PPDU to a first station and a second station, wherein the first station does not support receiving a midamble, and the second station supports receiving the midamble, and wherein:
• the second data field is transmitted on a second resource unit allocated to the second station, the second data field comprises a midamble subfield, the first data field is transmitted on a first resource unit allocated to the first station, the first data field comprises a first information subfield, the first information subfield comprises first data information, and the first information subfield is located before a first orthogonal frequency-division multiplexing (OFDM) symbol that corresponds to the midamble subfield;
• and
• wherein the PPDU further comprises a universal signal field (U-SIG), the U-SIG comprises a midamble indication subfield, and the midamble indication subfield indicates that the data field of the PPDU comprises the midamble subfield.