Service data transmission method and device

A mobility management entity, comprising:

• a communications interface, configured to receive a request message, wherein the request message comprises transmission mode indication information, and the transmission mode indication information is used to instruct a terminal to transmit service data by using a non-access stratum NAS signaling message;
• and
• a processor, configured to determine second service authorization information of the terminal based on subscription information of the terminal when determining, based on the request message received by the communications interface, that the terminal transmits the service data by using the non-access stratum (NAS) signaling message, wherein the second service authorization information comprises information used to indicate a service type and/or a priority that is allowed to be used by the terminal to transmit the service data, wherein
• the communications interface is further configured to send the second service authorization information to the terminal.

A terminal, comprising:

• a transmitter, configured to send a request message to a mobility management entity, wherein the request message comprises transmission mode indication information, and the transmission mode indication information is used to instruct the terminal to transmit service data by using a non-access stratum (NAS) signaling message;
• a receiver, configured to receive second service authorization information from the mobility management entity, wherein the second service authorization information comprises information used to indicate a service type and/or a priority that is allowed to be used by the terminal to transmit the service data;
• and
• a processor, configured to determine information about the service data based on the second service authorization information received by the receiver, wherein the information about the service data comprises at least one of the service type of the service data and the priority of the service data, wherein
• the transmitter is further configured to send the information that is about the service data and that is determined by the processor to an access network device.