Question: What failure type (failureType) should a User Equipment (UE) set in the MCGFailureInformation message when initiating transmission due to consistent uplink Listen Before Talk (LBT) failures on the Master Cell Group (MCG)?
Option 1: lbt-Failure
Option 2: t310-Expiry
Option 3: randomAccessProblem
Option 4: rlc-MaxNumRetx
Explanation: When a UE encounters consistent uplink LBT failures on the MCG, it must indicate this specific issue in the failure type field of the MCGFailureInformation message. The correct indication for such an event is 'lbt-Failure', highlighting the root cause as Listen Before Talk failures, crucial for network diagnostics and optimization, especially in scenarios where LBT is utilized for collision avoidance in shared or unlicensed spectrum.