Method, device, system and computer readable storage medium for data transmission

A method, device, system and computer readable storage medium for data transmission are disclosed herein. The method comprises: a terminal transmitting a wireless connection reestablishment request message to a network side device; and the terminal transmitting, according to a wireless connection reestablishment message received from the network side device, a wireless connection reestablishment completion message to the network side device, in which the wireless connection reestablishment completion message, the wireless connection reestablishment request message, and the wireless connection reestablishment message satisfy at least one of the following: the wireless connection reestablishment completion message comprises uplink data; the wireless connection reestablishment request message comprises first security information; and the wireless connection reestablishment message comprises at least one of second security information and indication information indicating that the second security information is invalid.