A terminal, comprising: a processing module , configured to set up a connection to a first base station, and stay in always connected mode, wherein staying in the always connected mode comprises always keeping the connection to the first base station and not entering idle state; a receiving module , configured to receive first dedicated signaling sent by the first base station, wherein the first dedicated signaling comprises second base station list information, and the second base station list information comprises information about each second base station having context information of the terminal; an obtaining module configured to obtain, according to the second base station list information, information about a second base station having the context information of the terminal; and a sending module , configured to perform data transmission through at least the second base station according to the second base station list information; wherein the receiving module is further configured to receive a second base station list update message sent by the first base station, update the second base station list information according to the second base station list update message, and obtain updated second base station list information; wherein the processing module is further configured to measure each neighboring base station in a network and, if a neighboring base station whose signal quality is higher than a first threshold exists, determine whether the updated second base station list information comprises information about the neighboring base station; and wherein the processing module is further configured to, if the updated second base station list information does not comprise the information about the neighboring base station, send a report message to the first base station, wherein the report messages indicates to the first base station that the neighboring base station does not have the context information of the terminal. a processing module , configured to set up a connection to a first base station, and stay in always connected mode, wherein staying in the always connected mode comprises always keeping the connection to the first base station and not entering idle state; a receiving module , configured to receive first dedicated signaling sent by the first base station, wherein the first dedicated signaling comprises second base station list information, and the second base station list information comprises information about each second base station having context information of the terminal; an obtaining module configured to obtain, according to the second base station list information, information about a second base station having the context information of the terminal; and a sending module , configured to perform data transmission through at least the second base station according to the second base station list information; wherein the receiving module is further configured to receive a second base station list update message sent by the first base station, update the second base station list information according to the second base station list update message, and obtain updated second base station list information; wherein the processing module is further configured to measure each neighboring base station in a network and, if a neighboring base station whose signal quality is higher than a first threshold exists, determine whether the updated second base station list information comprises information about the neighboring base station; and wherein the processing module is further configured to, if the updated second base station list information does not comprise the information about the neighboring base station, send a report message to the first base station, wherein the report messages indicates to the first base station that the neighboring base station does not have the context information of the terminal. <EOS>