Data Transmission Method And Communications Device

A data transmission method, comprising:

• receiving, by a second device, a first message from a first device, wherein the first message instructs the second device to stop sending data of an application to the first device;
• stopping, by the second device, sending the data of the application to the first device;
• sending, by the second device, first indication information to the first device, wherein the first indication information indicates a sequence number of data that is of the application and that has been received by the second device from the first device;
• and
• receiving, by the second device, second indication information from the first device, wherein the second indication information indicates a sequence number of data that is of the application and that has been received by the first device from the second device, wherein:
• the first device is a terminal device and the second device is a first server, or the first device is a first server and the second device is a terminal device;
• and after a connection between the terminal device and a second server is established, the first indication information and the second indication information are used to transmit the data of the application through the connection.

A communications device, comprising:

• a transmitter, configured to send a first message to a second device, wherein the first message instructs the second device to stop sending data of an application to the communications device;
• and
• a receiver, configured to receive first indication information from the second device, wherein the first indication information indicates a sequence number of data that is of the application and that has been received by the second device from the communications device;
• wherein
• the transmitter is further configured to send second indication information to the second device, wherein the second indication information indicates a sequence number of data that is of the application and that has been received by the communications device from the second device, wherein
• the communications device is a terminal device and the second device is a first server, or the communications device is a first server and the second device is a terminal device;
• and after a connection between the terminal device and a second server is established, the first indication information and the second indication information are used to transmit the data of the application through the connection.