A handover method, comprising: transmitting a handover request message by a source base station to a target base station, wherein the handover request message carries one or more data radio bearer, DRB, information items of a user equipment, UE, at the source base station and one or more flow quality of service, QoS, information items configured by a core network for the UE, wherein each DRB information item comprises a flow identifier, flow ID, and a DRB identifier, DRB ID, of a DRB associated with the flow ID, a packet data convergence protocol, PDCP, configuration information, a radio link control, RLC, configuration information, and a logical channel configuration information, wherein each flow QoS information item comprises identifier information for indicating a flow QoS information item and a QoS rule, wherein the identifier information includes a flow identifier, flow ID; and receiving, by the source base station, a handover request acknowledgement message from the target base station, wherein the handover request acknowledgement message carries a DRB configuration information for the UE based on information included in the handover request message, wherein the DRB configuration information is provided by the target base station, wherein the DRB configuration information comprises a DRB addition modification list of DRBs which the target base station agrees to establish, wherein each item in the DRB addition modification list includes a DRB ID and one or more flow IDs associated with a DRB corresponding to the DRB ID, a PDCP configuration information, an RLC configuration information and a logical channel configuration information. transmitting a handover request message by a source base station to a target base station, wherein the handover request message carries one or more data radio bearer, DRB, information items of a user equipment, UE, at the source base station and one or more flow quality of service, QoS, information items configured by a core network for the UE, wherein each DRB information item comprises a flow identifier, flow ID, and a DRB identifier, DRB ID, of a DRB associated with the flow ID, a packet data convergence protocol, PDCP, configuration information, a radio link control, RLC, configuration information, and a logical channel configuration information, wherein each flow QoS information item comprises identifier information for indicating a flow QoS information item and a QoS rule, wherein the identifier information includes a flow identifier, flow ID; and receiving, by the source base station, a handover request acknowledgement message from the target base station, wherein the handover request acknowledgement message carries a DRB configuration information for the UE based on information included in the handover request message, wherein the DRB configuration information is provided by the target base station, wherein the DRB configuration information comprises a DRB addition modification list of DRBs which the target base station agrees to establish, wherein each item in the DRB addition modification list includes a DRB ID and one or more flow IDs associated with a DRB corresponding to the DRB ID, a PDCP configuration information, an RLC configuration information and a logical channel configuration information. <EOS>