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

A method for performing secure re-allocation of a User Equipment (UE) from an initial core network element to a target core network element in a communication network, performed by an access network element, the method comprising:

• receiving, from the UE, a third initial UE message indicative of registration request, the third initial UE message being used for requesting registration with the initial core network element;
• receiving a first message comprising a candidate core network element list from the initial core network element, the candidate core network element list comprising the target core network element;
• storing the candidate core network element list and the third initial UE message;
• transmitting, to the initial core network element, a response message to the first message;
• receiving, from the UE, a first initial UE message indicative of registration request, the first initial UE message being and being used for requesting registration with the target core network element;
• selecting the target core network element from the candidate core network element list;
• and
• transmitting a second initial UE message indicative of registration request to the target core network element, wherein the second initial UE message is based on the third initial UE message and triggers a registration procedure between the UE and the target core network element.