Data transmission method and apparatus, device, and storage medium

A data transmission method applied to a terminal, comprising:

• sending first preset signaling to a master node, wherein the first preset signaling simultaneously comprises conditional PScell addition/change (CPAC) executed indication information for indicating that the terminal has executed a CPAC process, and information related to the CPAC executed indication information, comprising an identification of a target cell of a target secondary node selected by the terminal in the CPAC process,
• so that the master node, obtains a data forwarding address corresponding to the target cell from obtained data forwarding addresses according to the identification of the target cell;
• in a case that the CPAC process is a conditional PScell change CPC process, sends second preset signaling to a source secondary node, wherein the second preset signaling simultaneously comprises CPC executed indication information for indicating that the terminal has executed the CPC process, and information related to the CPC executed indication information, comprising the identification of the target cell and the data forwarding address corresponding to the target cell;
• simultaneously receives to-be-transmitted data corresponding to the terminal and sequence number status transfer signaling corresponding to the to-be-transmitted data which are sent, in a late data forwarding procedure, from the source secondary node triggering the late data forwarding procedure based on the CPC executed indication information, as well as the data forwarding address corresponding to the target cell which is sent from the source secondary node based on the information related to the CPC executed indication information;
• and sends the to-be-transmitted data and the sequence number status transfer signaling corresponding to the to-be-transmitted data to the target secondary node according to the data forwarding address corresponding to the target cell.

A data transmission method applied to a secondary node, comprising:

• receiving second preset signaling sent from a master node according to conditional PScell addition/change (CPAC) executed indication information, wherein:
• the second preset signaling simultaneously comprises conditional PScell change (CPC) executed indication information for indicating that a terminal has executed a CPC process, and information related to the CPC executed indication information, comprising an identification of a target cell and data forwarding address corresponding to the target cell, and the second preset signaling is generated by the master node according to the CPAC executed indication information in first preset signaling sent by the terminal in a case that a conditional PScell addition/change (CPAC) process that the terminal has executed is the CPC process, the first preset signaling simultaneously comprising the CPAC executed indication information for indicating that the terminal has executed the CPAC process, and information related to the CPAC executed indication information, comprising an identification of a target cell of a target secondary node selected by the terminal in the CPAC process;
• triggering a late data forwarding procedure based on the CPC executed indication information, sending to-be-transmitted data corresponding to the terminal and sequence number status transfer signaling corresponding to the to-be-transmitted data in the late data forwarding procedure, sending the data forwarding address corresponding to the target cell based on the information related to the CPC executed indication information,
• so that the master node sends the to-be-transmitted data and the sequence number status transfer signaling corresponding to the to-be-transmitted data to the target secondary node according to the data forwarding address corresponding to the target cell.