: Holds master user profiles, subscription data, and encryption keys.
Provides connectivity to external Packet Data Networks (PDN). It handles IP address allocation, QoS (Quality of Service) enforcement, charging, and packet filtering for the user. E. PCRF (Policy and Charging Rules Function) Role: Policy engine.
Carries control signaling between the eNodeB and the MME using the S1 Application Protocol (S1-AP). : Holds master user profiles, subscription data, and
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To protect user privacy, the network avoids sending the permanent identity (IMSI) over the airwaves whenever possible. Instead, the MME generates a temporary ID called the . The UE uses the GUTI for subsequent connections to avoid being tracked by third parties. 📥 [Insert your link] To protect user privacy,
: A central database containing subscriber-related information, including subscription data and authentication vectors.
Evolved Packet Core (EPC) for Communications Service Providers : Holds master user profiles
Handles signaling, authentication, and movement (mobility).
Here are some of the key call flows in the EPC:
The occurs when a UE powers on and registers with the network to obtain an IP address and establish default data connectivity. Below is the step-by-step signaling flow:
MME sends an attach accept message to the UE. B. Service Request Procedure (Idle to Active)