What is the subsystem task that is responsible for performing a centralized IMSI lookup?

Question

Options

• AMME Manager
• BMME Demux Manager
• CSession Manager
• DIMSI Manager

• A
  8% (2)
• B
  4% (1)
• C
  4% (1)
• D
  83% (20)

Explanation

IMSI Manager is the dedicated subsystem task built specifically to maintain a centralized registry that maps each IMSI to its owning Session Manager, making it the only component capable of answering the question "which session manager owns this subscriber?" for any incoming message.

Why the distractors are wrong:

• A (MME Manager) is the top-level orchestrator of the entire MME subsystem - it manages lifecycle and configuration, not subscriber lookups.
• B (MME Demux Manager) receives and distributes incoming S1-AP/GTP-C messages to the appropriate session manager; it relies on the IMSI Manager to know where to route, but doesn't do the lookup itself.
• C (Session Manager) owns and processes individual UE session state, but it only knows about the IMSIs assigned to it - it has no global view of all subscribers.

Memory tip: Think of the IMSI Manager as the system's "subscriber phone book" - every other task has to call the phone book to find out which Session Manager is handling a given IMSI before they can act on it.

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