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The is the IP-based core network architecture for LTE, designed to replace the legacy 2G/3G network cores (GPRS/UMTS). It offers a flat, non-hierarchical architecture that reduces latency and allows for faster packet switching, supporting high-speed data services, Voice over LTE (VoLTE), and seamless mobility.
LTE networks do not route raw packets dynamically without structure. Instead, they establish a virtual tunnel called an between the mobile device (User Equipment or UE) and the P-GW.
The process of moving from one tower (eNodeB) to another without dropping the call. This public link is valid for 7 days
When a device powers down or loses network access, it gracefully disconnects to free up core network resources. The UE sends a Detach Request to the MME.
The MME initiates a default bearer setup with the S-GW and P-GW.
The primary control node. It handles subscriber authentication, session management, and mobility (tracking and handovers). Serving Gateway (S-GW): Can’t copy the link right now
Routes and forwards user data packets while acting as the mobility anchor during handovers between eNodeBs.
This article provides an in-depth overview of the core concepts of the EPC, essential call flows, and why understanding these components is vital for modern telecommunications professionals. 1. What is the 4G LTE Evolved Packet Core (EPC)?
PCRF decision (e.g., an incoming voice call) or network policy. It offers a flat, non-hierarchical architecture that reduces
: The exit and entry point of traffic for the User Equipment (UE). It allocates IP addresses, enforces Quality of Service (QoS), and performs packet filtering.
Connects the eNodeB to the MME for control-plane signaling.
The Attach Procedure is the process where the UE connects to the network to receive IP services.
Understanding EPC call flows is crucial for troubleshooting and optimizing the LTE network. The following are the most common procedures [1]. A. LTE Attach Procedure (Initial Registration)
The "brain" of the control plane. It handles UE (User Equipment) tracking, paging, authentication, and session management. It does not handle user data traffic.