Question: When applying both header compression and Forward Error Correction (FEC) to mission critical (MC) service communications over Multimedia Broadcast Multicast Services (MBMS), what is the mandated order of operations?
Option 1: FEC encoding followed by MBMS bearer establishment (pre-established or dynamic)
Option 2: FEC encoding followed by header compression
Option 3: Header compression followed by FEC encoding and then MBMS bearer establishment (pre-established or dynamic)
Option 4: MBMS bearer establishment (pre-established or dynamic) followed by simultaneous application of FEC encoding and header compression
Explanation: According to procedures for mission critical services over MBMS, when both header compression (e.g., using ROHC) and Forward Error Correction (FEC) are applied, the correct sequence is to first perform FEC encoding. This ensures error correction is in place before headers are compressed, maintaining communication integrity while reducing overhead. Header compression is then applied after FEC encoding to minimize protected packet sizes.