Support of data transmission in a packet mobile network

A radio access network entity comprising:

• at least one processor;
• and
• at least one memory including computer program code,
• the at least one memory and the computer program code configured to, with the at least one processor, cause the radio access network entity at least to:
• perform a procedure to re-initiate user data transmission at transition from an idle state to an active state, said user data transmission using a tunnel over an interface between the radio access network entity and a serving user plane core network entity,
• receive, within said procedure, identification information from a user equipment over a radio interface,
• select, based on the identification information, an uplink tunnel endpoint identifier from said at least one memory, and
• forward, based on the selection, uplink data from said user equipment to said serving user plane core network entity.

A radio access network entity method comprising:

• performing a procedure to re-initiate user data transmission at transition from an idle state to an active state, said user data transmission using a tunnel over an interface between a radio access network entity and a serving user plane core network entity;
• receiving, within said procedure, identification information from a user equipment over a radio interface;
• selecting, based on the identification information, an uplink tunnel endpoint identifier stored in said serving radio access network entity;
• and,
• forwarding, based on the selection, uplink data from said user equipment to said serving user plane core network entity.