Method, device, and system for core network device re-allocation in wireless network

An initial core network element for performing secure re-allocation of a UE from the initial core network element to a target core network element, the initial core network element comprising a memory for storing computer instructions and a processor in communication with the memory, wherein, when the processor executes the computer instructions, the processor is configured to cause the initial core network element to:

• receive, from a first network element, a first message comprising a list of candidate core network elements;
• select the target core network element from the list of candidate core network elements;
• and
• generate a 5G Global Unique Temporary Identifier (5G-GUTI) for the UE based on the target core network element, the 5G-GUTI being used by the UE, after a first registration request initiated by the UE, to initiate a second registration request.

A non-transitory storage medium for storing computer readable instructions, the computer readable instructions, when executed by a processor in an initial core network element, causing the processor to:

• receive, from a first network element, a first message comprising a list of candidate core network elements;
• select, from the list of candidate core network elements, a target core network element to which a UE is to-be re-allocated from the initial core network element;
• and
• generate a 5G Global Unique Temporary Identifier (5G-GUTI) for the UE based on the target core network element, the 5G-GUTI being used by the UE, after a first registration request initiated by the UE, to initiate a second registration request.