A method for use in a communication system based on Long Term Evolution, LTE, architecture, the method comprising: receiving, by a first base station, a second base station identity sent from a first mobility management entity, MME; establishing a transmission channel between the first base station and a second base station corresponding to the second base station identity; receiving, by the first base station, data from a first terminal; and sending, by the first base station to the second base station, the data over the transmission channel, wherein the data is to be sent from the second base station to a second terminal; wherein establishing the transmission channel between the first base station and the second base station comprises: after receiving the second base station identity sent by the first MME, determining, by the first base station, whether a neighboring base station of the first base station includes the second base station corresponding to the second base station identity; if the neighboring base station of the first base station includes the second base station, establishing, by the first base station, a directly connected transmission path to the second base station, so as to establish the transmission channel between the first base station and the second base station; and if the neighboring base station of the first base station does not include the second base station, broadcasting, by the first base station, a path detection message that carries the second base station identity to a neighboring base station; receiving, by the first base station, a response message sent by the neighboring base station; determining the transmission path to the second base station according to the response message, wherein the response message carries link quality information of a channel or information about a total hop count of a link from the first base station to the second base station; and establishing, by the first base station, the transmission channel between the first base station and the second base station based on the determined transmission path. receiving, by a first base station, a second base station identity sent from a first mobility management entity, MME; establishing a transmission channel between the first base station and a second base station corresponding to the second base station identity; receiving, by the first base station, data from a first terminal; and sending, by the first base station to the second base station, the data over the transmission channel, wherein the data is to be sent from the second base station to a second terminal; wherein establishing the transmission channel between the first base station and the second base station comprises: after receiving the second base station identity sent by the first MME, determining, by the first base station, whether a neighboring base station of the first base station includes the second base station corresponding to the second base station identity; if the neighboring base station of the first base station includes the second base station, establishing, by the first base station, a directly connected transmission path to the second base station, so as to establish the transmission channel between the first base station and the second base station; and if the neighboring base station of the first base station does not include the second base station, broadcasting, by the first base station, a path detection message that carries the second base station identity to a neighboring base station; receiving, by the first base station, a response message sent by the neighboring base station; determining the transmission path to the second base station according to the response message, wherein the response message carries link quality information of a channel or information about a total hop count of a link from the first base station to the second base station; and establishing, by the first base station, the transmission channel between the first base station and the second base station based on the determined transmission path. after receiving the second base station identity sent by the first MME, determining, by the first base station, whether a neighboring base station of the first base station includes the second base station corresponding to the second base station identity; if the neighboring base station of the first base station includes the second base station, establishing, by the first base station, a directly connected transmission path to the second base station, so as to establish the transmission channel between the first base station and the second base station; and if the neighboring base station of the first base station does not include the second base station, broadcasting, by the first base station, a path detection message that carries the second base station identity to a neighboring base station; receiving, by the first base station, a response message sent by the neighboring base station; determining the transmission path to the second base station according to the response message, wherein the response message carries link quality information of a channel or information about a total hop count of a link from the first base station to the second base station; and establishing, by the first base station, the transmission channel between the first base station and the second base station based on the determined transmission path.