Master node transport network layer information exchange for downlink data forwarding of a secondary node terminated bearer

A master node (MN) for wireless communication, comprising:

• a memory;
• and
• one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
• receive an acknowledgment message from a secondary node (SN), wherein the MN and the SN are to provide dual connectivity with a core network for a user equipment;
• and
• provide an address indication message to the SN based at least in part on receiving the acknowledgment message, wherein the address indication message is provided in a first message that immediately follows the acknowledgment message and that is before the MN provides a first radio resource control (RRC) reconfiguration message, wherein the address indication message includes MN downlink transport network layer (TNL) information for an SN terminated data radio bearer (DRB) that requires master cell group (MCG) resources, and wherein a message format of the first message is different when the address indication message is associated with an SN addition preparation procedure than when the address indication is associated with an MN initiated SN modification procedure.

A secondary node (SN) for wireless communication, comprising:

• a memory;
• and
• one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
• receive an address indication message from a master node (MN), wherein the SN and the MN are to provide dual connectivity with a core network for a user equipment, wherein the address indication message is received in a first message that immediately follows an acknowledgment message and that before the MN provides a first radio resource control (RRC) reconfiguration message, wherein the address indication message includes MN downlink transport network layer (TNL) information for an SN terminated data radio bearer (DRB) that requires master cell group (MCG) resources, and wherein a message format of the first message is different when the address indication message is associated with an SN addition preparation procedure than when the address indication is associated with an MN initiated SN modification procedure;
• and
• forward, based at least in part on the MN downlink TNL information, downlink data for the SN terminated DRB that requires MCG resources.