Path switch method between LTE and 5G node

An apparatus comprising:

• at least one processor;
• and
• at least one non-transitory memory including computer program code, the at least one processor, the at least one memory, and the computer program code configured to cause the apparatus to at least:
• receive, at the apparatus, an indication to persist a first tunnel identifier located at a master base station, while the apparatus sends, towards a second tunnel identifier located at a secondary node, user plane traffic for a user equipment in dual connectivity with the master base station and the secondary node;
• and
• switch, at the apparatus, the user plane traffic between the second tunnel identifier and the first tunnel identifier, when the apparatus receives, via a user plane, an error indication and/or a switch indication.

An apparatus comprising:

• at least one processor;
• and
• at least one non-transitory memory including computer program code, the at least one processor, the at least one memory, and the computer program code configured to cause the apparatus to at least:
• initiate, by the apparatus, an addition of a secondary node serving as a secondary cell group for dual connectivity;
• send, by the apparatus, an indication to persist, at a serving gateway, a first tunnel identifier located at the apparatus to enable fallback switching to the first tunnel identifier;
• and
• send, by the apparatus and via a user plane, an error indication and/or a switch indication requesting the user plane traffic to be switched at the serving gateway to the second tunnel identifier located at the network node.

A method comprising:

• initiating an addition of a secondary node serving as a secondary cell group for dual connectivity;
• sending an indication to persist, at a serving gateway, a first tunnel identifier located at the apparatus to enable fallback switching to the first tunnel identifier;
• and
• sending, via a user plane, an error indication and/or a switch indication requesting the user plane traffic to be switched at the serving gateway to the second tunnel identifier located at the network node.