Question: In a Dual Connectivity scenario, what is the role of the Master RAN Node in relation to the Secondary RAN Node?
Option 1: The Master RAN Node only manages the control plane, while the Secondary RAN Node handles the user plane.
Option 2: The Master RAN Node performs all necessary N2 related functions and may use resources of the Secondary RAN Node to exchange User Plane traffic of a UE.
Option 3: The Master RAN Node is responsible for setting up Dual Connectivity, but only if the Secondary RAN Node has sufficient resources available.
Option 4: The Master RAN Node and Secondary RAN Node have equal roles in managing the user plane and control plane.
Explanation: In a Dual Connectivity scenario, the Master RAN Node performs all necessary N2 related functions such as mobility management, relaying of NAS signalling, etc. and manages the handling of user plane connection (e.g. transfer over N3). It may use resources of another RAN node, the Secondary RAN node, to exchange User Plane traffic of an UE. This is a key aspect of Dual Connectivity, allowing for more efficient use of network resources and improved user experience.