+--------+ +---------------------------------------+ | UE | | Evolved Packet Core (EPC) | | (Phone)| | | +----+---+ | +-----------+ +-----------+ | | | | MME | | HSS | | | (LTE) | +-----+-----+ +-----+-----+ | +----+---+ | | | | | eNodeB |-------+---------+-------------------+ | +----+---+ | | | | | +-----+-----+ +-----------+ | +-----------+---| S-GW |-------| P-GW |---+---[ Internet ] | +-----------+ +-----+-----+ | | | | | +-----+-----+ | | | PCRF | | | +-----------+ | +---------------------------------------+
Handles lawful interception and charging functionality. E. PCRF (Policy and Charging Rules Function)
Enables authentication data exchange between the MME and the HSS using Diameter protocol. SGi: Links the P-GW to external IP networks. Key 4G LTE Call Flows 1. LTE Attach and Default Bearer Setup Procedure
+------+ +------------------------------------+ | UE | | Evolved Packet Core | +--+---+ | | | | +-------+ +-------+ | +--+---+ | | MME +------------+ HSS | | |eNodeB+-------+---+---+---+ +-------+ | +------+ | | | | +---+---+ +-------+ | | | S-GW +------------+ PCRF | | | +---+---+ +-------+ | | | | | +---+---+ | | | P-GW +--- PDN / Internet | | +-------+ | +------------------------------------+ SGi: Links the P-GW to external IP networks
If you are looking for specific, in-depth for a particular vendor, I can help you find those. Or if you need to understand 5G core comparisons to this 4G structure, just let me know. Share public link
The EPC is comprised of several key logical nodes, each performing specific functions to maintain connectivity and service quality:
Comprehensive Guide to 4G LTE Evolved Packet Core (EPC): Concepts and Call Flows Or if you need to understand 5G core
EPC and 4G Packet Networks - Second Edition
Handles the actual data (video streams, web pages) moving through the network. Key Network Elements
These nodes work together through standardized interfaces and protocols to ensure robust, secure, and efficient mobile broadband services. responsible for managing user authentication
Created on top of an existing default bearer to provide specialized QoS for specific traffic, such as VoLTE (Voice over LTE) or video streaming. It can be GBR or Non-GBR. QoS Parameters
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Control traffic (signaling) and user traffic (data) are separated, allowing for independent scaling of capacity and control functionality.
