Question: In a virtualized EPC (Evolved Packet Core) network, how does the Element Management (EM) system generate the 'Mean processor usage' measurement for a virtualized EPC Network Function (NF)?
Option 1: By directly querying the physical CPU usage of the underlying hardware.
Option 2: Through periodic sampling of the virtual CPU usage of the VNFC (Virtual Network Function Component) instance(s), followed by a weighted average calculation.
Option 3: By receiving instantaneous CPU usage values from the Virtual Network Function Manager (VNFM) and taking a simple arithmetic mean.
Option 4: Via real-time monitoring of packet switched traffic only.
Explanation: In a virtualized EPC NF, the EM generates the measurement by taking a weighted average of virtual CPU usage performance values from VNFC instance(s), received from the VNFM, to account for composite virtual CPU usage across potentially multiple instances.