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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
LTE call flow explained - sessions rooted across the network - YateBTS
It provides a permanent IP connection to the device, ensuring instant communication. Backward Compatibility:
Routes and forwards user data packets while acting as the mobility anchor during handovers between eNodeBs.
The is the framework that provides converged voice and data on a 4G Long-Term Evolution (LTE) network. Unlike previous generations, the EPC features a flat, all-IP architecture that unifies circuit-switched and packet-switched sub-domains into a single packet-switched domain. Core Concepts of LTE EPC The MME sends a to the S-GW over the S11 interface
Manages quality of service (QoS) rules and charging, ensuring users are billed according to their data plans. The 4G LTE Attach Call Flow
: The exit point to external networks like the Internet. It handles IP address allocation, Quality of Service (QoS) enforcement, and deep packet inspection.
These components communicate through standardized interfaces to ensure interoperability:
This article provides a comprehensive overview of 4G LTE EPC concepts, architecture, and essential call flows, suitable for engineers and students looking for in-depth understanding. 1. What is the Evolved Packet Core (EPC)? Step 3: Acknowledgment and Release LTE call flow
For engineers, students, and network architects, visual documentation is essential. Detailed and diagrams provide step-by-step illustrations of the signaling messages (e.g., S1-MME, S11, S5/S8) that are difficult to visualize otherwise. These documents are essential for:
Created on top of the default bearer when high-priority, specific traffic is detected (e.g., a VoLTE voice call or live video stream). It often utilizes a Guaranteed Bit Rate (GBR) to prevent packet loss. Tracking Areas (TA)
When a device moves from an idle state (no data) to an active state.
Evolved Packet Core (EPC) is the framework for providing converged voice and data on a 4G LTE network. It is an all-IP architecture that separates the control and data planes to reduce latency and improve scalability. Core Network Elements Unlike previous generations, the EPC features a flat,
Understanding the EPC is not just about mastering 4G; it is the perfect foundation for 5G. The 5G Core (5GC) is built on similar principles of virtualization, session management, and an all-IP architecture. However, 5GC introduces a Service-Based Architecture (SBA) and network slicing. The MME in 4G is split into the (Access and Mobility Management Function) and SMF (Session Management Function) in 5G.
When you turn on an LTE smartphone, it must register with the core network to receive an IP address and basic data access.
The Evolved Packet Core is the powerhouse of 4G LTE networks. By understanding its key components (MME, SGW, PGW, HSS), critical interfaces (S1, S5, S11, S6a), and essential call flows (attach, dedicated bearer, handover, TAU, detach), you gain the expertise needed to design, troubleshoot, and optimize modern mobile networks.