Question: In a 3GPP Adaptive Multi-Rate (AMR) speech codec context, when the Transmission (TX) part of the Access Network (AN) encounters multiple frame types simultaneously, which of the following statements accurately describes the prioritization for transmission?
Option 1: Frames marked as TX_TYPE = (NO_DATA) are always transmitted first to ensure network resource allocation updates.
Option 2: Frames marked as TX_TYPE = (SID_UPDATE) have higher priority than TX_TYPE = (SPEECH) frames to maintain consistent audio quality.
Option 3: All frame types (SPEECH, SID_UPDATE, NO_DATA) are transmitted simultaneously without prioritization to ensure real-time communication.
Option 4: SPEECH frames override other frame types (SID_UPDATE and NO_DATA) for transmission in exceptional cases.
Explanation: In the context of Adaptive Multi-Rate (AMR) speech codec, ensuring uninterrupted voice communication is crucial. Therefore, when the TX part of the Access Network operates under exceptional conditions, prioritizing SPEECH frames over SID_UPDATE and NO_DATA frames guarantees that voice data is transmitted promptly, maintaining call quality and integrity. This aligns with the principle of giving precedence to real-time sensitive data (like voice) in telecommunications networks.