Information transmission method, user equipment, access network device, and core network device

An information transmission method, comprising:

• receiving, by a first access network device, a first request message sent by user equipment UE, wherein the first request message is a first air interface message for the UE to switch from an idle state to a connected state, the first request message carries an attach request message and air interface identity information that is pre-allocated by the first access network device to the UE before the UE performs an attach process, and the air interface identity information corresponds to at least one UE that communicates with the first access network device;
• obtaining, by the first access network device, dedicated air interface identity information of the UE based on the first request message;
• and
• sending, by the first access network device, the dedicated air interface identity information of the UE to the UE.

User equipment, comprising:

• a memory comprising instructions;
• and
• a processor in communication with the memory, wherein the processor is configured to execute the instructions to cause the user equipment to:
• determine, when the user equipment (UE) is in an idle state, whether there is to-be-transmitted uplink information, and
• send, when it is determined that there is to-be-transmitted uplink information, a first request message to a first access network device, wherein the first request message is a first air interface message for the UE to switch from the idle state to a connected state, and the first request message carries uplink non-access stratum (NAS) information and air interface identity information that is stored on the UE.