A mobility management method, wherein the method comprises: receiving, by a target evolved NodeB, eNB, a handover request sent by a source eNB, wherein the handover request is used to hand over a user equipment, UE, from the source eNB to the target eNB; characterized in that the method comprises: sending, by the target eNB, original configuration information and updated configuration information to the UE, wherein the original configuration information and the updated configuration information are used for the UE to perform a handover operation from the source eNB to the target eNB according to a selection between the original configuration information and the updated configuration information, wherein the method further comprises: sending, by the target eNB, an updated tag to the UE through the source eNB, wherein the updated tag is used for the UE to select the original configuration information or the updated configuration information between the original configuration information and the updated configuration information to perform the handover operation according to the updated tag. receiving, by a target evolved NodeB, eNB, a handover request sent by a source eNB, wherein the handover request is used to hand over a user equipment, UE, from the source eNB to the target eNB; characterized in that the method comprises: sending, by the target eNB, original configuration information and updated configuration information to the UE, wherein the original configuration information and the updated configuration information are used for the UE to perform a handover operation from the source eNB to the target eNB according to a selection between the original configuration information and the updated configuration information, wherein the method further comprises: sending, by the target eNB, an updated tag to the UE through the source eNB, wherein the updated tag is used for the UE to select the original configuration information or the updated configuration information between the original configuration information and the updated configuration information to perform the handover operation according to the updated tag. sending, by the target eNB, original configuration information and updated configuration information to the UE, wherein the original configuration information and the updated configuration information are used for the UE to perform a handover operation from the source eNB to the target eNB according to a selection between the original configuration information and the updated configuration information, wherein the method further comprises: sending, by the target eNB, an updated tag to the UE through the source eNB, wherein the updated tag is used for the UE to select the original configuration information or the updated configuration information between the original configuration information and the updated configuration information to perform the handover operation according to the updated tag. sending, by the target eNB, an updated tag to the UE through the source eNB, wherein the updated tag is used for the UE to select the original configuration information or the updated configuration information between the original configuration information and the updated configuration information to perform the handover operation according to the updated tag.