Data transmission method, apparatus and device and computer-readable storage medium

1. A data transmission method performed by an Access and Mobility Management Function (AMF), comprising:

receiving a Non-Access-Stratum Data Protocol Data Unit (NAS Data PDU) sent by a User Equipment (UE), wherein the NAS Data PDU carries user plane data and the NAS Data PDU is sent by the UE when the UE is establishing a Radio Resource Control (RRC) connection;

determining a Session Management Function (SMF) and forwarding the user plane data to the SMF, wherein after the SMF receives the user plane data, the SMF forwards the user plane data to a User Plane Function (UPF).

2. The method according to claim 1 , wherein determining the SMF comprises:

determining whether the UE establishes a Protocol Data Unit (PDU) session;

when the UE does not establish the PDU session, determining the SMF according to first selection assistance information;

when the UE establishes the PDU session, determining the SMF according to second selection assistance information.

3. The method according to claim 2 , wherein, the first selection assistance information comprises any one or more of following: a Data Network Name (DNN), slice assistance information, a local configuration or policy of an operator, and a routing indicator;

the second selection assistance information comprises any one or more of following information: a PDU session identifier, a DNN, slice assistance information, a local configuration or policy of an operator, and a routing indicator.

4. A communication device, comprising a transceiver, a storage, a processor, and a computer program stored on the storage and executable by the processor, wherein, when the computer program is executed by the processor, the processor implements steps in the method according to claim 1 .

5. A data transmission method performed by a Session Management Function (SMF), comprising:

receiving user plane data forwarded by an Access and Mobility Management Function (AMF), wherein the user plane data is carried in a Non-Access-Stratum Data Protocol Data Unit (NAS Data PDU) sent by a UE to the AMF when the UE is establishing a Radio Resource Control (RRC) connection;

forwarding the user plane data to a User Plane Function (UPF).

6. The method according to claim 5 , wherein forwarding the user plane data to the UPF, comprises:

forwarding the user plane data to the UPF through a N4 message.

7. A communication device, comprising a transceiver, a storage, a processor, and a computer program stored on the storage and executable by the processor, wherein, when the computer program is executed by the processor, the processor implements steps in the method according to claim 5 .

8. A data transmission method performed by a User Plane Function (UPF), comprising:

receiving user plane data forwarded by a Session Management Function (SMF), wherein the user plane data is carried in a Non-Access-Stratum Data Protocol Data Unit (NAS Data PDU) sent by a UE to an AMF when the UE is establishing a Radio Resource Control (RRC) connection, and the data is forwarded by the AMF to the SMF;

forwarding the user plane data to a data network according to a data forwarding rule.

9. The method according to claim 8 , wherein receiving the user plane data forwarded by the SMF comprises:

receiving the user plane data forwarded by the SMF through a N4 message.

10. A communication device, comprising a transceiver, a storage, a processor, and a computer program stored on the storage and executable by the processor, wherein, when the computer program is executed by the processor, the processor implements steps in the method according to claim 8 .

11. A data transmission method performed by a User Equipment (UE), comprising:

sending a Non-Access-Stratum Data Protocol Data Unit (NAS Data PDU) to a base station when the UE is establishing a Radio Resource Control (RRC) connection so that the base station forwards the NAS Data PDU to an Access and Mobility Management Function (AMF), wherein the NAS Data PDU carries user plane data.

12. A communication device, comprising a transceiver, a storage, a processor, and a computer program stored on the storage and executable by the processor, wherein, when the computer program is executed by the processor, the processor implements steps in the method according to claim 11 .

13. A data transmission method performed by a base station, comprising:

receiving Non-Access-Stratum Data Protocol Data Unit (NAS Data PDU) sent by a User Equipment (UE) when the UE is establishing a Radio Resource Control (RRC) connection, wherein the NAS Data PDU carries user plane data;

forwarding the NAS Data PDU to an Access and Mobility Management Function (AMF).

14. The method according to claim 13 , wherein forwarding the NAS Data PDU to the AMF comprises:

forwarding the NAS Data PDU to the AMF through a N2 message.

15. A communication device, comprising a transceiver, a storage, a processor, and a computer program stored on the storage and executable by the processor, wherein, when the computer program is executed by the processor, the processor implements steps in the method according to claim 13 .