Epc Concepts And Call Flows Download Hot //top\\ — 4g Lte Evolved Packet Core

Connects the P-GW to the PCRF for dynamic policy control.

The MME informs the HSS of the UE's location. The HSS downloads the user’s subscription profile to the MME.

The MME initiates a default bearer setup with the S-GW and P-GW. Connects the P-GW to the PCRF for dynamic policy control

The MME sends a to the S-GW over the S11 interface. The S-GW passes this to the P-GW over S5/S8. The P-GW releases the allocated IP address, terminates policy enforcement with the PCRF, and returns a Delete Session Response . Step 3: Acknowledgment and Release

UE detects a new tracking area, periodic TAU timer expires, or UE returns to coverage. The MME initiates a default bearer setup with

When a UE in idle mode moves into a new Tracking Area (TA) not in its TA List, it initiates a TAU.

PCRF decision (e.g., an incoming voice call) or network policy. The P-GW releases the allocated IP address, terminates

The EPC splits the control plane (signaling) and the user plane (data traffic) to allow independent scaling of network resources. It consists of four primary network elements: 1. Mobility Management Entity (MME)

Uses GTP-C (GPRS Tunneling Protocol Control Plane) to establish and manage tunnels.

The "brain" of the control plane. It handles UE (User Equipment) tracking, paging, authentication, and session management. It does not handle user data traffic.