Question: Which entities are involved in exchanging the EN-DC SON Configuration container via the EN-DC CONFIGURATION TRANSFER message, and what is the possible direction of this message transfer?
Option 1: UE (User Equipment) to eNB (eNodeB), with a unidirectional transfer from UE to eNB.
Option 2: eNB (eNodeB) to en-gNB (next-generation NodeB), or en-gNB to eNB, with bidirectional capability.
Option 3: MME (Mobility Management Entity) to SGW (Serving and Packet Data Network Gateway), with a unidirectional transfer from MME to SGW.
Option 4: eNB (eNodeB) to UE (User Equipment), with a unidirectional transfer from eNB to UE for configuration updates.
Explanation: The correct answer accurately reflects the involvement of eNB and en-gNB in exchanging the EN-DC SON Configuration container, crucial for seamless operation between different generations of radio access networks, with bidirectional capability ensuring flexibility in network configuration and management.