Frame transmission method for wireless local area network and wireless local area network apparatus

A wireless local area network apparatus to recognize frames of different wireless local area network standards, the wireless local area network apparatus comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the processor is configured to generate a frame, wherein the frame comprises a user common signal field and a legacy signal field, wherein the user common signal field comprises a first symbol and N subsequent second symbols, wherein N is a positive integer, wherein a first symbol cyclic prefix is before the first symbol, wherein a first symbol cyclic suffix is after the first symbol, and wherein a second symbol cyclic prefix is before each second symbol of the N second symbols, wherein a length of the first symbol cyclic prefix is the same as a length of a cyclic prefix of the legacy signal field, wherein a length of the first symbol cyclic suffix is a difference obtained by subtracting the length of the cyclic prefix of the legacy signal field from a long guard period, and a length of the second symbol cyclic prefix is the long guard period to support different wireless local area network standards so that the wireless local area networking flexibility is increased and complexity is decreased;
• and
• a transmitter in communication with the processor that is configured to send the frame to a wireless local area network apparatus;
• wherein the long guard period is two times the length of the cyclic prefix of the legacy signal field, and the length of the first symbol cyclic suffix is the same as the length of the cyclic prefix of the legacy signal field, or
• wherein the long guard period is three times the length of the cyclic prefix of the legacy signal field, and the length of the first symbol cyclic suffix is two times the length of the cyclic prefix of the legacy signal field.