Duplication transmission method and device

A duplication transmission method, comprising:

• receiving, by a DU, a PDCP data packet which is sent by a CU and needs to be transmitted on a radio bearer, and information for instructing to perform PDCP duplication transmission;
• sending, by the DU, the PDCP data packet to a plurality of Radio Link Control, RLC, entities corresponding to the radio bearer for PDCP duplication transmission;
• wherein receiving, by the DU, a PDCP data packet which is sent by a CU and needs to be transmitted on a radio bearer, and information instructing the DU to perform PDCP duplication transmission, comprises:
• if the radio bearer is an SRB, then receiving, by the DU, the PDCP data packet which is sent by the CU and needs to be transmitted on the radio bearer through F1 control plane, and determining the information for instructing to perform PDCP duplication transmission in an Information Element, IE, of a corresponding F1 interface message;
• or
• if the radio bearer is a DRB, then receiving, by the DU, the PDCP data packet which is sent by the CU and needs to be transmitted on the radio bearer through F1 user plane, and determining the information for instructing to perform PDCP duplication transmission in a corresponding data packet header of user plane.

A duplication transmission device, comprising:

• a processor, a memory and a transceiver;
• wherein the memory stores data used by the processor when performing operations, and the transceiver is configured to receive and send data under control of the processor;
• wherein the processor is configured to read a program in the memory and perform:
• determining that PDCP duplication transmission needs to be performed on a radio bearer, sending a PDCP data packet to be transmitted on the radio bearer to a DU, and instructing the DU to perform the PDCP duplication transmission;
• wherein the processor is specifically configured to:
• if the radio bearer is an SRB, then send a PDCP data packet to be transmitted on the SRB to the DU through F1 control plane, and instruct the DU to perform the PDCP duplication transmission through an Information Element, IE, in a corresponding F1 interface message;
• or
• if the radio bearer is a DRB, then send a PDCP data packet transmitted on the DRB to the DU through F1 user plane, and instruct the DU to perform the PDCP duplication transmission in a corresponding data packet header of user plane.