Question: In MBMS services utilizing FEC protection, what is the primary goal of applying interleaving to source blocks before FEC encoding?
Option 1: To reduce the overall size of UDP packets for efficient transmission
Option 2: To maximize media duration at receivers that tune in during a specific source block, prioritizing high-priority media units
Option 3: To enhance security by encrypting media streams within the interleaving process
Option 4: To synchronize the transmission of multiple media streams from different sources
Explanation: The correct answer, Option 2, aligns with the purpose of interleaving. By rearranging UDP packet transmission order, interleaving ensures high-priority media units are transmitted to allow receivers to decode meaningful content even when tuning in mid-stream, maximizing resulting media duration for late-joining receivers, crucial for maintaining service quality in broadcast/multicast scenarios.