Downlink PPDU sending method and apparatus, and downlink PPDU receiving method and apparatus

A radio physical layer protocol data unit (PPDU) receiving method, comprising:

• receiving a radio physical layer protocol data unit (PPDU), wherein the PPDU includes a high efficiency-signal field A (HE-SIG-A) and a high efficiency-signal field B (HE-SIG-B), the HE-SIG-A includes a field indicating a quantity of orthogonal frequency division multiplexing (OFDM) symbols in the HE-SIG-B, and wherein a value of the field indicates whether the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16;
• and
• determining, based on the received PPDU, the quantity of OFDM symbols included in the HE-SIG B;
• wherein if a value of the field is 15, the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16, and the quantity of OFDM symbols included in the HE-SIG-B is determined based on station quantity information indicated by a common field in the HE-SIG-B.

A radio physical layer protocol data unit (PPDU) sending apparatus, comprising:

• a non-transitory memory storage comprising instructions;
• and
• one or more hardware processors in communication with the non-transitory memory storage, wherein the one or more hardware processors execute the instructions to:
• obtain a radio physical layer protocol data unit (PPDU), wherein the PPDU includes a high efficiency-signal field A (HE-SIG-A) and a high efficiency-signal field B (HE-SIG-B), and the HE-SIG-A includes a field indicating a quantity of orthogonal frequency division multiplexing (OFDM) symbols in the HE-SIG-B, and wherein a value of the field indicates whether the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16, and if the value of the field is 15, the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16 and determined based on station quantity information indicated by a common field in the HE-SIG-B;
• and
• a transmitter, configured to send the PPDU.

A radio physical layer protocol data unit (PPDU) receiving apparatus, comprising:

• a non-transitory memory storage comprising instructions;
• and
• one or more hardware processors in communication with the non-transitory memory storage, wherein the one or more hardware processors execute the instructions to:
• a receiver, configured to receive a radio physical layer protocol data unit (PPDU), wherein the PPDU includes a high efficiency-signal field A (HE-SIG-A) and a high efficiency-signal field B (HE-SIG-B), the HE-SIG-A includes a field indicating a quantity of orthogonal frequency division multiplexing (OFDM) symbols in the HE-SIG-B, and wherein a value of the field indicates whether the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16;
• a non-transitory memory storage comprising instructions;
• and
• determine, based on the received PPDU, the quantity of OFDM symbols in the HE-SIG-B;
• wherein if a value of the field is 15, the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16, and the quantity of OFDM symbols included in the HE-SIG-B is determined based on station quantity information indicated by a common field in the HE-SIG-B.