Data transmission, receiving method and apparatus and a network system

Embodiment of the present invention provides a transmitting apparatus and a receiving method and a network system data. The data transmission method comprising RTSA, the RTSA carries a user address list; transmitting RTS, CTS receiving side in response to the RTS returned; to the end of transmission data; wherein, the list of addresses for indicating user NAV is set after receiving the RTSA user receiving the RTS or the CTS. STA various embodiments of the present invention by adding a RTSA complement and expand the RTS / CTS mechanism, the received RTSA after receiving the RTS / CTS is set NAV according to the instruction selection RTSA user address lists, can be transmitted to the data transmission terminal the data are timely response, to overcome the existing technical and conflicting issues is not easy to implement, provides an effective protection mechanism for data transmission.