Question: What actions does a User Equipment (UE) take upon receiving an SC-MRB (Single-Cell Multi-Radio Bearer) release in an E-UTRA network?
Option 1: Releases RLC entity, related MAC & physical layer configuration, and informs upper layers about the release with tmgi and sessionId.
Option 2: Only releases the RLC entity without notifying upper layers or altering MAC/physical configurations.
Option 3: Notifies upper layers without releasing the RLC entity or its associated MAC and physical layer configurations.
Option 4: Suspends (but does not release) all related radio bearers until further instruction.
Explanation: Upon SC-MRB release, the UE must undertake a comprehensive set of actions to properly terminate the resource allocation. This includes releasing the Radio Link Control (RLC) entity, which manages data transmission, as well as its related Medium Access Control (MAC) and physical layer configurations to free up resources. Additionally, informing upper layers about this release with specific identifiers ensures seamless network operation and context update.