Question: What is the primary factor that limits the calculated Used UE-AMBR (User Equipment Aggregate Maximum Bit Rate) in a mobile network?
Option 1: The sum of all available APN-AMBRs (Access Point Name Aggregate Maximum Bit Rates) across the network.
Option 2: The total number of active User Equipment (UE) devices in the network.
Option 3: The maximum bit rate supported by the base station's backhaul connection.
Option 4: The value of the Subscribed UE-AMBR (User Equipment Aggregate Maximum Bit Rate) assigned to the user.
Explanation: Used UE-AMBR is calculated as the sum of Used/Authorized APN-AMBRs for all active APNs, but this calculation is capped at the Subscribed UE-AMBR, ensuring a user's aggregate data rate doesn't exceed their subscribed limit.