Overview Core EPC 05-04-2022
Contenido • • • • • •
Que es LTE y EPC? Cual es la arquitectura de EPC? Cuales son los Elementos de Red Principales? Cual es la función de los Elementos de Red? Cuales son las Interfaces Principales? Que tipo de Señalización y Protocolos son utilizados?
4G Overview - Roadmap
4G Overview - Roadmap
LTE y EPC The EPC is the latest evolution of the 3GPP core network architecture.
LTE Highlights • • • • •
Provide low latency Higher network throughput Increased data transfer speed More cost effectiveness Improvements over 3G network
LTE y EPC The high-level network architecture of LTE is comprised of following three main components: 1. The User Equipment (UE). 2. The Evolved UMTS Terrestrial Radio Access Network (E-UTRAN). 3. The Evolved Packet Core (EPC). The evolved packet core communicates with packet data networks in the outside world such as the internet, private corporate networks or the IP multimedia subsystem.
The interfaces between the different parts of the system are denoted Uu, S1 and SGi as shown below:
3GPP Core Network Evolution 3GPP Network has evolved from 4 tier architecture to 3 tier architecture
Network Architecture Evolution
Radical Changes in EPC End of circuit-switched voice: • LTE uses VoIP. Evolved wireless broadband Mobility as a part of the core network: • In LTE, all mobility management is moved into the mobile core and becomes the responsibility of the MME.
Radical Changes in EPC End-to-end QoS becomes essential: • LTE must provide superior end-to-end QoS management and enforcement in order to deliver new media-rich, low-latency and real-time services. Policy management and enforcement: • Service control is provided via the Policy and Charging Rules Function (PCRF) • PCRF dynamically controls and manages all data sessions and provides appropriate interfaces towards charging and billing systems. • LTE requires significantly more capacity in both the data plane and control plane.
EPC Architecture
Flat IP architecture & Low Cost per GB
EPC Network Elements The EPC is realized through four new elements:
• Serving Gateway (SG-W) • Packet Data Network (PDN) Gateway (P-GW) • Mobility Management Entity (MME) • Policy and Charging Rules Function (PCRF) SGW, PGW and MME are introduced in 3GPP Release 8 PCRF was introduced in 3GPP Release 7
4G- LTE/EPC Network Elements
MME
S-GW
P-GW
PCRF
HSS
UMTS to LTE Migration
LTE/3G Equivalent Concepts
TE/EPS Reference Architecture –10,000 Ft View(Ref 3GPP TS23.401, TS23.402)
C-Plane Protocol Stacks
U-Plane Protocol Stacks
LTE Terms
LTE Terms
PDN Connection and EPS Bearer
PDN Connection and EPS Bearer
QoS Model
EPS Bearer Concept
EPS Bearer Concept
EPS Bearer Concept
QoS Concepts
QoS Concept
QoS Class Identifier
Summary The Evolved Packet Core (EPC) is an IP-based core network infrastructure that provides packet data services to support the convergence of licensed (2G/3G/4G) and unlicensed (Wi-Fi*) radio technologies. The EPC also provides the capability for the integration of wireless with wireline and other alternative networks to enable IP-based communications and services over both wireless and wireline networks. The EPC provides a common subscriber anchor for mobility, billing, policy, and charging.
The three core elements of the EPC are the Mobility Management Entity (MME), Serving Gateway (SGW), and Packet Data Network Gateway (PGW).
Summary
Summary The 3rd Generation Partner Project (3GPP*) defines the details of the EPC architecture, functional elements, and interface requirements. As stated above, the EPC is designed to support any on-access technology. The following links provide a good introduction to EPC-based on-access technology. 3GPP TS 23.002 (http://www.3gpp.org/ DynaReport/23002.htm) Provides an overview of the architecture of the 3GPP system. In particular, it describes all the network elements used in the EPC and also in legacy core networks. 3GPP TS 23.401 (http://www.3gpp.org/DynaReport/23401.htm) Defines the architecture of the EPC for Evolved Terrestrial Radio Access Network (E-UTRAN) access. 3GPP TS 23.402 (http://www.3gpp.org/ftp/Specs/html-info/23402.htm) Defines the architecture enhancements for non-3GPP access. Figure 3 provides an example of the basic 3GPP interfaces for EPC to support Circuit Switch (CS) and Packet Switch (PS) services. The blue lines represent EPC-specific interfaces.
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