Cell handover method and device

An apparatus, which is a target base station of user equipment (UE) or included in the target base station of the UE, the apparatus comprising:

• a processor coupled to a memory, wherein the memory stores processor-executable program instructions, and the program instructions comprises instructions for:
• receiving a handover request from a source base station, wherein the handover request comprises a context of a current serving node of the UE and a context of the UE;
• generating offloading configuration information of the current serving node to maintain transmission of user plane data in the current serving node, and radio resource control (RRC) reconfiguration information of the UE;
• sending, to the source base station, a handover request acknowledgment that carries configuration information of the current serving node and the RRC reconfiguration information of the UE, wherein the configuration information of the current serving node comprises the offloading configuration information of the current serving node, and wherein the source base station sends the RRC reconfiguration information of the UE to the UE and sends the offloading configuration information of the current serving node to the current serving node;
• and
• receiving an uplink synchronization message that is sent by the UE after the UE completes offloading configuration according to the RRC reconfiguration information of the UE, wherein the current serving node remains as a user plane serving node for the UE and provides uplink data communication for the UE after the UE is handed over from the source base station to the target base station.

A communication system, comprising a target base station, a source base station, and a current serving node of user equipment (UE);

• wherein the target base station is configured to:
• receive a handover request from the source base station, wherein the handover request comprises a context of the current serving node and a context of the UE;
• generate offloading configuration information of the current serving node to maintain transmission of user plane data in the current serving node, and radio resource control (RRC) reconfiguration information of the UE;
• send a handover request acknowledgment to the source base station, wherein the handover request acknowledgment carries configuration information of the current serving node and the RRC reconfiguration information of the UE, and wherein the configuration information of the current serving node comprises the offloading configuration information of the current serving node;
• and
• receive an uplink synchronization message from the UE;
• wherein the source base station is configured to:
• send the handover request to the target base station;
• receive the handover request acknowledgment from the target base station;
• send the RRC reconfiguration information of the UE to the UE for performing offloading configuration;
• and
• send the offloading configuration information of the current serving node to the current serving node;
• and
• wherein the current serving node is configured to:
• receive the offloading configuration information of the current serving node from the source base station;
• and
• remain as a user plane serving node for the UE and provides uplink data communication for the UE after the UE is handed over from the source base station to the target base station.