Handling QoS mobility and dual connectivity in NR

A method of operation of a Master Next Generation—Radio Access Network, NG-RAN, node in a cellular communications network, comprising:

• deciding, by the Master NG-RAN node, to split an existing Protocol Data Unit, PDU, session that includes a current uplink tunnel information;
• and
• setting up, by the Master NG-RAN node, resources for the split PDU session by performing one or more of:
• sending, by the Master NG-RAN node, an S-Node Addition/Modification Request including the current uplink tunnel information for the split PDU session to a Secondary NG-RAN node in the cellular communications network;
• receiving, by the Master NG-RAN node, a newly added additional downlink tunnel information from the Secondary NG-RAN node;
• sending, by the Master NG-RAN node, a PDU Session Resource Modify Indication to a Fifth Generation Core, 5GC, node in the cellular communications network, where the PDU Session Resource Modify Indication comprises a current downlink tunnel information for the split PDU session and the newly added additional downlink tunnel information for the split PDU session;
• receiving, by the Master NG-RAN node, a newly added additional uplink tunnel information from the 5GC node;
• and
• sending, by the Master NG-RAN node, an S-Node Modification Request including the newly added additional uplink tunnel information to the Secondary NG-RAN node.