Question: In MBMS (Multimedia Broadcast/Multicast Service) bearer services, what is the primary difference between the Quality-of-Service (QoS) attributes for Background and Streaming traffic classes?
Option 1: Supported SDU error ratio values
Option 2: Support of a guaranteed bit-rate
Option 3: Maximum bit-rate allocation per session
Option 4: Allocation of radio resources for point-to-point services
Explanation: The key distinction between Background and Streaming classes in MBMS bearer services lies in the QoS attribute of guaranteed bit-rate. Specifically, only the Streaming class supports a guaranteed bit-rate, which is crucial for real-time streaming services to ensure consistent data transfer rates. In contrast, Background class does not guarantee a specific bit-rate, making it more suitable for non-real-time services like messaging or downloading, where total transfer time is not critical. This difference directly impacts how MBMS user services are transported and experienced by end-users.