A method for data transmission, comprising: determining, by a transmission device, a plurality of wireless links through which data is to be transmitted between the transmission device and a reception device, transmitting, by the transmission device, physical-layer transmission blocks comprising identical Medium Access Control Protocol Data Units, MAC PDUs, to the reception device through the determined plurality of wireless links, wherein, redundancy versions of the physical-layer transmission blocks comprising the identical MAC PDUs are partially the same, or completely different, wherein, determining, by the transmission device, the plurality of wireless links through which data is to be transmitted between the transmission device and the reception device comprises: determining, by a primary physical-layer unit in the transmission device, the plurality of wireless links through which data is to be transmitted between the transmission device and the reception device, and transmitting, by the transmission device, physical-layer transmission blocks comprising identical MAC PDUs to the reception device through the determined plurality of wireless links comprises: performing, by the primary physical-layer unit, physical-layer treatment to MAC PDUs generated by a user-plane high-layer protocol stack, so as to generate the physical-layer transmission blocks comprising the identical MAC PDUs; transmitting, by the primary physical-layer unit, all of the physical-layer transmission blocks to physical-layer units corresponding to the plurality of wireless links through which data is to be transmitted, one physical-layer transmission block being transmitted to one physical-layer unit; and transmitting, by the physical-layer units corresponding to the plurality of wireless links through which data is to be transmitted, the physical-layer transmission blocks comprising the identical MAC PDUs to the reception device through the wireless links corresponding to the physical-layer units. determining, by a transmission device, a plurality of wireless links through which data is to be transmitted between the transmission device and a reception device, transmitting, by the transmission device, physical-layer transmission blocks comprising identical Medium Access Control Protocol Data Units, MAC PDUs, to the reception device through the determined plurality of wireless links, wherein, redundancy versions of the physical-layer transmission blocks comprising the identical MAC PDUs are partially the same, or completely different, wherein, determining, by the transmission device, the plurality of wireless links through which data is to be transmitted between the transmission device and the reception device comprises: determining, by a primary physical-layer unit in the transmission device, the plurality of wireless links through which data is to be transmitted between the transmission device and the reception device, and transmitting, by the transmission device, physical-layer transmission blocks comprising identical MAC PDUs to the reception device through the determined plurality of wireless links comprises: performing, by the primary physical-layer unit, physical-layer treatment to MAC PDUs generated by a user-plane high-layer protocol stack, so as to generate the physical-layer transmission blocks comprising the identical MAC PDUs; transmitting, by the primary physical-layer unit, all of the physical-layer transmission blocks to physical-layer units corresponding to the plurality of wireless links through which data is to be transmitted, one physical-layer transmission block being transmitted to one physical-layer unit; and transmitting, by the physical-layer units corresponding to the plurality of wireless links through which data is to be transmitted, the physical-layer transmission blocks comprising the identical MAC PDUs to the reception device through the wireless links corresponding to the physical-layer units. performing, by the primary physical-layer unit, physical-layer treatment to MAC PDUs generated by a user-plane high-layer protocol stack, so as to generate the physical-layer transmission blocks comprising the identical MAC PDUs; transmitting, by the primary physical-layer unit, all of the physical-layer transmission blocks to physical-layer units corresponding to the plurality of wireless links through which data is to be transmitted, one physical-layer transmission block being transmitted to one physical-layer unit; and transmitting, by the physical-layer units corresponding to the plurality of wireless links through which data is to be transmitted, the physical-layer transmission blocks comprising the identical MAC PDUs to the reception device through the wireless links corresponding to the physical-layer units.