A data transmission method, wherein the method comprises: separately establishing (202; 401; 601), by a node, a connection to a macro base station and a small cell, wherein the node, the macro base station, and the small cell are located in a same access network, and the connection is an X2 connection or a user-defined logical connection; and scheduling, by the node, coordinated data, wherein the coordinated data is data cooperatively transmitted by the macro base station and the small cell for user equipment characterized in, that the method further comprises: receiving, by the node, first connection information from the macro base station, and receiving second connection information from the small cell, wherein the first connection information is used to indicate quality of a network connection between the macro base station and the user equipment, and the second connection information is used to indicate quality of a network connection between the small cell and the user equipment; determining, by the node according to the first connection information and the second connection information, whether the macro base station and the small cell need to perform coordinated transmission for the user equipment; and if coordinated transmission is required, sending, by the node, a coordinated transmission indication to the macro base station and/or the small cell.. separately establishing (202; 401; 601), by a node, a connection to a macro base station and a small cell, wherein the node, the macro base station, and the small cell are located in a same access network, and the connection is an X2 connection or a user-defined logical connection; and scheduling, by the node, coordinated data, wherein the coordinated data is data cooperatively transmitted by the macro base station and the small cell for user equipment characterized in, that the method further comprises: receiving, by the node, first connection information from the macro base station, and receiving second connection information from the small cell, wherein the first connection information is used to indicate quality of a network connection between the macro base station and the user equipment, and the second connection information is used to indicate quality of a network connection between the small cell and the user equipment; determining, by the node according to the first connection information and the second connection information, whether the macro base station and the small cell need to perform coordinated transmission for the user equipment; and if coordinated transmission is required, sending, by the node, a coordinated transmission indication to the macro base station and/or the small cell.. receiving, by the node, first connection information from the macro base station, and receiving second connection information from the small cell, wherein the first connection information is used to indicate quality of a network connection between the macro base station and the user equipment, and the second connection information is used to indicate quality of a network connection between the small cell and the user equipment; determining, by the node according to the first connection information and the second connection information, whether the macro base station and the small cell need to perform coordinated transmission for the user equipment; and if coordinated transmission is required, sending, by the node, a coordinated transmission indication to the macro base station and/or the small cell..