Question: In E-UTRAN, during handover, what is the maximum number of user plane transport bearers that can be established per E-RAB for relaying Downlink data from the source eNB to the target eNB for a UE?
Option 1: One
Option 2: Two, one for high-priority and one for low-priority traffic
Option 3: Depends on the number of S1 bearers established for the UE
Option 4: Unlimited, as long as resources are available
Explanation: According to E-UTRAN principles, at most one user plane transport bearer per E-RAB allocated to the UE can be established for relaying DL data, ensuring efficient resource utilization and seamless handover by limiting bearer management complexity on a per-E-RAB basis.