4g Lte Evolved Packet Core -epc- - Concepts And Call Flows Download ((exclusive)) [OFFICIAL]

Now, let’s walk through the three most important procedures. (These are included in full detail in the downloadable PDF.)

This is the process a smartphone goes through when it is switched on or enters LTE coverage. It is the most complex yet fundamental flow in EPC. Now, let’s walk through the three most important

This happens when you turn on your phone in an LTE coverage area. This happens when you turn on your phone

UE registers, gets IP, establishes default bearer. Understanding its nodes, bearer model, and call flows

The EPC is a distributed, all-IP core network where MME handles control, SGW/PGW handle user data, and HSS/PCRF provide subscriber and policy intelligence. Understanding its nodes, bearer model, and call flows (attach, TAU, handover, dedicated bearer) is essential for 4G network planning, optimization, and troubleshooting. This report serves as a compact, actionable reference for both field and lab work.

UE moves to new TA not in its TA List.

| Node | Full Name | Key Functions | |------|-----------|----------------| | | Mobility Management Entity | – NAS signaling, authentication, paging, bearer activation/deactivation. – Selects SGW/PGW for UE. | | SGW | Serving Gateway | – User-plane anchor for intra-LTE mobility. – Packet routing, buffering for idle UEs. | | PGW | PDN Gateway | – UE IP address allocation. – Policy enforcement (PCRF), charging, firewall. – Gateway to external PDNs (Internet, IMS). | | HSS | Home Subscriber Server | – Master database for subscribers. – Stores IMSI, authentication vectors, subscription QoS. | | PCRF | Policy & Charging Rules Function | – Real-time policy control (e.g., bitrate caps, QoS). – Provides PCC rules to PGW. |