Handover Method, Base Station, and Communications System

A base station, comprising:

• a transceiver;
• at least one processor;
• and
• a non-transitory computer-readable storage medium storing a program to be executed by the at least one processor, the program including instructions for:
• causing the transceiver to send, to a source core network device in a process of handing user equipment (UE) over from the base station to a target base station, a handover required message, wherein the message comprises identification information of a target core network device, and wherein the identification information of the target core network device instructs the source core network device to perform a core network relocation process with the target core network device;
• wherein the base station is connected to the source core network device, and wherein the target base station is connected to both the source core network device and the target core network device.