Question: Upon receiving an SRB (Signaling Radio Bearer) release instruction from the network, what action does a UE (User Equipment) take for each SRB type (SRB3, SRB4, SRB5) indicated for release?
Option 1: The UE only releases the srb-Identity for the specified SRBs but keeps the associated PDCP (Packet Data Convergence Protocol) entities active.
Option 2: The UE releases the PDCP entity for all SRBs regardless of which specific SRB types are indicated for release.
Option 3: The UE ignores the release instruction for SRB types that are currently not in use.
Option 4: For each SRB type (SRB3, SRB4, SRB5) indicated by the network for release, the UE releases both the associated PDCP entity and the srb-Identity.
Explanation: This is correct because, according to protocol logic, for each SRB type indicated for release, the UE must release both the PDCP entity, handling packet data convergence, and the srb-Identity, ensuring a complete release of resources associated with the specified SRBs, maintaining network efficiency and resource allocation integrity.