METHOD AND DEVICE FOR DATA TRANSMISSION, AND COMPUTER STORAGE MEDIUM
FIG5 is a schematic structural diagram of a data transmission apparatus applied to the UE according to embodiment 1 of the present application  FIG3 is a schematic diagram of DU switching under the control of an identical CU in related technology
A data transmission apparatus, applied to the source DU, as shown in FIG5, includes:a triggering unit 51, used for reporting the PDCP transmission status report to the CU, and the PDCP transmission status report enables the CU to determine which PDCP PDU data is not successfully received by the UE and retransmit the PDCP PDU data which is not successfully received by the UE to the UE via the target DU.  As shown in FIG3, due to the centralized deployment of CU, a CU of a serving cell may connect multiple DUs, and when a user moves from a service range of one DU controlled by a current CU to a service range of another DU controlled by the current CU, the user needs to switch from a current DU to a target DU. And this DU switching under the control of an intra-CU may be frequent because DUs are densely deployed.
schematic diagram, schematic structural diagram
51
triggering unit
5
transmission flow in embodiment
3
option
4
transmission flow in embodiment
402
UE. In step
401
described below. In step
['2. A data transmission apparatus, comprising: a triggering unit, configured to report a packet data convergence protocol, PDCP, transmission status report to a centralized unit, CU, wherein the PDCP transmission status report enables the CU to determine which PDCP protocol data unit, PDU, data is not successfully received by a UE and retransmit the PDCP PDU data which is not successfully received by the UE to the UE via a target distributed unit, DU.']