Question: In a SEAL architecture, when an NRM client detects poor MBMS bearer quality with no ongoing data transmission, what is the primary challenge it faces in estimating the quality, and how might it overcome this?
Option 1: The challenge is accurately measuring Block Error Rate (BLER); it overcomes this by relying on modulation and coding scheme (MCS) analysis and reference signal measurements from eNB(s).
Option 2: The challenge is detecting hidden VAL service communications; it overcomes this by periodically querying the NRM server for ongoing broadcasts.
Option 3: The challenge is differentiating between MBMS and unicast bearer qualities; it overcomes this by comparing RTP packet loss rates between bearers.
Option 4: The challenge is notifying the NRM server without disrupting service; it overcomes this by using a separate, high-priority notification channel.
Explanation: In scenarios with no data transmission on the MBMS bearer, estimating its quality (e.g., as an equivalent BLER) can depend on factors like the modulation and coding scheme (MCS) and measurements from eNB reference signals. This approach helps the NRM client to assess the bearer's usability for VAL service communications without actual data transmission, addressing the primary challenge of quality estimation in such conditions.