Question: What is a key characteristic of an E-RAB (Evolved Radio Access Bearer) ID in relation to its uniqueness and lifespan across different network procedures?
Option 1: The E-RAB ID changes with each S1 handover to ensure bearer security.
Option 2: The E-RAB ID is unique only within a specific UE's context, not across all UEs on the same S1 connection.
Option 3: The E-RAB ID remains constant for the duration of the E-RAB, regardless of S1 connection releases or handovers.
Option 4: The uniqueness of an E-RAB ID is guaranteed only within a single S1 connection, not across multiple connections.
Explanation: This is correct because the E-RAB ID's primary function is to uniquely identify a radio access bearer for a particular User Equipment (UE) throughout its existence. Its constancy ensures seamless continuity of service, even through network procedures like S1 handovers or temporary releases of the UE-associated logical S1 connection, thereby maintaining the integrity and identity of the E-RAB across these events.