Data transmission method, apparatus and system

A gateway, comprising:

• a first processor, configured to detect whether data transmitted in a received general packet radio service tunnelling protocol for the user plane GTP-U data packet is data of a predetermined type;
• and if a result of the detection is that data transmitted in the GTP-U data packet is data of a predetermined type, decapsulate the GTP-U data packet, to obtain the data of the predetermined type and a destination address of the data of the predetermined type;
• and
• a first transmitter, configured to send, to a message gateway, the data of the predetermined type and the destination address that are obtained through decapsulation by the first processor, so that the message gateway forwards the data of the predetermined type according to the destination address.

A gateway, comprising:

• a first receiver, configured to receive data of a predetermined type and a destination address of the data of the predetermined type that are sent by a message gateway;
• a first processor, configured to control a first transmitter to forward a general packet radio service tunnelling protocol for the user plane GTP-U data packet, wherein the GTP-U data packet is obtained by encapsulating the data of the predetermined type and the destination address that are received by the first receiver;
• and
• the first transmitter, configured to forward the GTP-U data packet under the control of the first processor.