Method for processing non-access stratum message, user equipment, and network side device

A method for processing a non-access stratum message, performed by user equipment, wherein the user equipment comprises at least one non-access stratum module and at least two access stratum modules, each of the at least one non-access stratum module comprising a baseband of a processor, each of the at least two access stratum modules comprising a receiver and a transmitter, the method comprising:

• acquiring configuration information;
• changing a mapping of the at least one non-access stratum module to at least one of the access stratum modules according to the configuration information;
• when there are at least two access stratum modules to which mapping is performed, comparing priorities of the access stratum modules to which mapping is performed, and selecting a first access stratum module to which mapping is performed and that has a highest priority to receive a non-access stratum message from a network side device or to send a non-access stratum message to the network side device;
• and
• transferring the non-access stratum message between the at least one non-access stratum module and the first access stratum module to which mapping is performed, wherein the at least two access stratum modules separately support different network standards.

A network side device configured to connect user equipment to at least one core network, wherein the user equipment comprises at least one non-access stratum module and at least two access stratum modules, wherein the at least two access stratum modules separately support different network standards, wherein each of the at least one non-access stratum module comprises a baseband of a processor, wherein each of the at least two access stratum modules comprises a receiver and a transmitter, the network side device comprising:

• a processor configured to generate configuration information;
• and
• a first transceiver configured to receive the configuration information from the processor, and send the configuration information to the user equipment, wherein the configuration information is configured to enable the user equipment to change a mapping, according to the configuration information, of the at least one non-access stratum module to at least one of the access stratum modules,
• wherein when there are at least two access stratum modules to which mapping is performed, the first transceiver is further configured to receive a non-access stratum message from a first access stratum module of the user equipment or to send a non-access stratum message to the first access stratum module of the user equipment, wherein the first access stratum module is selected according to a highest priority among priorities of the access stratum modules to which mapping is performed.