SlideShare a Scribd company logo
1 of 12
SAE-EPC
        Introduction
         Inam Ullah
Head of Product Development
Contents


What is SAE/EPC
SAE Advantages
SAE Architecture
Description of SAE Components
Services in EPS Networks
What is SAE/EPC


System Architecture Evolution (aka SAE) is the core network architecture
of 3GPP's LTE wireless communication standard
SAE is the evolution of the GPRS Core Network, with some differences:
Simplified architecture
All-IP Network (AIPN)
Support for higher throughput and lower latency radio access
networks (RANs)
Support for, and mobility between, multiple heterogeneous access
networks, including E-UTRA (LTE and LTE Advanced air interface), 3GPP
legacy systems (for example GERAN or UTRAN, air interfaces
of GPRS and UMTS respectively), but also non-3GPP systems (for
example WiMAX or cdma2000)
SAE - Advantages


Improved data capacity: With 3G LTE offering data download rates of 100 Mbps, and the
focus of the system being on mobile broadband, it will be necessary for the network to be
able to handle much greater levels of data. To achieve this it is necessary to adopt a
system architecture that lends itself to much grater levels of data transfer.
All IP architecture: When 3G was first developed, voice was still carried as circuit switched
data. Since then there has been a relentless move to IP data. Accordingly the new SAE,
System Architecture Evolution schemes have adopted an all IP network configuration.
Reduced latency: With increased levels of interaction being required and much faster
responses, the new SAE concepts have been evolved to ensure that the levels of latency
have been reduced to around 10 ms. This will ensure that applications using 3G LTE will be
sufficiently responsive.
Reduced OPEX and CAPEX: A key element for any operator is to reduce costs. It is
therefore essential that any new design reduces both the capital expenditure (CAPEX)and
the operational expenditure (OPEX). The new flat architecture used for SAE System
Architecture Evolution means that only two node types are used. In addition to this a high
level of automatic configuration is introduced and this reduces the set-up and
commissioning time.
Description of SAE Components


LTE SAE Evolved Packet Core, EPC consists of four main
elements as listed below:
  Mobility Management Entity –MME
  Serving Gateway –SGW
  Packet Gateway –PGW
  Policy Charging and Rule Function -PCRF
Mobility Management Entity, MME


 The MME is the main control node for the LTE SAE access network, handling a number of features:
     Idle mode UE tracking
     Bearer activation / de-activation
     Choice of SGW for a UE
     Intra-LTE handover involving core network node location
     Interacting with HSS to authenticate user on attachment and implements roaming restrictions
     It acts as a termination for the Non-Access Stratum (NAS)
     Provides temporary identities for UEs
     The SAE MME acts the termination point for ciphering protection for NAS signaling. As part of this it
     also handles the security key management. Accordingly the MME is the point at which lawful
     interception of signaling may be made.
     Paging procedure
     The S3 interface terminates in the MME thereby providing the control plane function for mobility
     between LTE and 2G/3G access networks.
     The SAE MME also terminates the S6a interface for the home HSS for roaming UEs.
 It can therefore be seen that the SAE MME provides a considerable level of overall control
 functionality.
Serving Gateway, SGW:


 The Serving Gateway, SGW, is a data plane element within the LTE SAE.
Its main purpose is to manage the user plane mobility and it also acts as the
main border between the Radio Access Network, RAN and the core
network.
The SGW also maintains the data paths between the eNodeBs and the PDN
Gateways. In this way the SGW forms a interface for the data packet
network at the E-UTRAN.
Routing and forwarding user data packets
acts as mobility anchor for the user plane during inter-eNB handovers and
for mobility between LTE and other 3GPP
for idle state UEs, terminates the DL data path and triggers paging when DL
data arrives for the UE
performs replication of the user traffic in case of lawful interception.
PDN Gateway, PGW:


Like the SGW, the Packet Data Network Gateway (PDN GW) is the termination
point of the packet data interface towards the Packet Data Network(s).
As an anchor point for sessions towards the external Packet Data Networks, the
PDN GW supports:
  Policy enforcement features (applies operator-defined rules for resource allocation
  and usage)
  Packet filtering (for example, deep packet inspection for application type detection)
  Charging support (for example, per-URL charging)

One bearer, a datapath between a UE and a PDN, has three segments:
  Radio bearer between UE and eNodeB
  Data bearer between eNodeB and SGW
  Data bearer between SGW and PGW
Policy and Charging Rules Function,
              PCRF:

the Policy and Charging Enforcement
Function(PCEF) is the generic name
for the functional entity that supports
service data flow detection , policy
enforcement and flow-based
charging.
The Application Function (AF)
represents the network element that
supports applications that require
dynamic policy and/or charging
control.
In the IMS model, the AF is
implemented by the Proxy Call
Session Control Function (P-CSCF).
Services in IMS Network
End

More Related Content

What's hot

LTE (Long Term Evolution) Introduction
LTE (Long Term Evolution) IntroductionLTE (Long Term Evolution) Introduction
LTE (Long Term Evolution) IntroductionGuisun Han
 
Lte attach-messaging
Lte attach-messagingLte attach-messaging
Lte attach-messagingPraveen Kumar
 
LTE Call Processing and Handover
LTE Call Processing and HandoverLTE Call Processing and Handover
LTE Call Processing and HandoverSitha Sok
 
Circuit switched fallback
Circuit switched fallbackCircuit switched fallback
Circuit switched fallbackSubhash Kumar
 
LTE Location Management and Mobility Management
LTE Location Management and Mobility ManagementLTE Location Management and Mobility Management
LTE Location Management and Mobility Managementaliirfan04
 
4 g LTE, LTE Advance
4 g LTE, LTE Advance 4 g LTE, LTE Advance
4 g LTE, LTE Advance Sajid Marwat
 
Evolution of Core Networks
Evolution of Core NetworksEvolution of Core Networks
Evolution of Core NetworksSarp Köksal
 
PCRF-Policy Charging System-Functional Analysis
PCRF-Policy Charging System-Functional AnalysisPCRF-Policy Charging System-Functional Analysis
PCRF-Policy Charging System-Functional AnalysisBiju M R
 
LTE Architecture and interfaces
LTE Architecture and interfacesLTE Architecture and interfaces
LTE Architecture and interfacesAbdulrahman Fady
 
LTE Architecture Overview
LTE Architecture OverviewLTE Architecture Overview
LTE Architecture OverviewHossein Yavari
 
SRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFB
SRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFBSRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFB
SRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFBVikas Shokeen
 
lte physical layer overview
 lte physical layer overview lte physical layer overview
lte physical layer overviewPraveen Kumar
 
Csfb (circuit switch fall back)
Csfb (circuit switch fall back)Csfb (circuit switch fall back)
Csfb (circuit switch fall back)Rishi Mahajan
 
VoLTE Interfaces , Protocols & IMS Stack Explained
VoLTE Interfaces , Protocols & IMS Stack ExplainedVoLTE Interfaces , Protocols & IMS Stack Explained
VoLTE Interfaces , Protocols & IMS Stack ExplainedVikas Shokeen
 
4G LTE full tutorial
4G LTE full tutorial4G LTE full tutorial
4G LTE full tutorialAfzaal Anwar
 
LTE - Long Term Evolution
LTE - Long Term EvolutionLTE - Long Term Evolution
LTE - Long Term EvolutionArief Gunawan
 
5GC Registration Failure Codes
5GC Registration Failure Codes5GC Registration Failure Codes
5GC Registration Failure CodesKoorosh Hoveyda
 

What's hot (20)

LTE (Long Term Evolution) Introduction
LTE (Long Term Evolution) IntroductionLTE (Long Term Evolution) Introduction
LTE (Long Term Evolution) Introduction
 
Lte attach-messaging
Lte attach-messagingLte attach-messaging
Lte attach-messaging
 
LTE Call Processing and Handover
LTE Call Processing and HandoverLTE Call Processing and Handover
LTE Call Processing and Handover
 
Circuit switched fallback
Circuit switched fallbackCircuit switched fallback
Circuit switched fallback
 
VOLTE Presentation
VOLTE PresentationVOLTE Presentation
VOLTE Presentation
 
UMTS/LTE/EPC Call Flows for CSFB
UMTS/LTE/EPC Call Flows for CSFBUMTS/LTE/EPC Call Flows for CSFB
UMTS/LTE/EPC Call Flows for CSFB
 
LTE Location Management and Mobility Management
LTE Location Management and Mobility ManagementLTE Location Management and Mobility Management
LTE Location Management and Mobility Management
 
4 g LTE, LTE Advance
4 g LTE, LTE Advance 4 g LTE, LTE Advance
4 g LTE, LTE Advance
 
Lte epc kp is and signalling (sf)
Lte epc kp is and signalling (sf)Lte epc kp is and signalling (sf)
Lte epc kp is and signalling (sf)
 
Evolution of Core Networks
Evolution of Core NetworksEvolution of Core Networks
Evolution of Core Networks
 
PCRF-Policy Charging System-Functional Analysis
PCRF-Policy Charging System-Functional AnalysisPCRF-Policy Charging System-Functional Analysis
PCRF-Policy Charging System-Functional Analysis
 
LTE Architecture and interfaces
LTE Architecture and interfacesLTE Architecture and interfaces
LTE Architecture and interfaces
 
LTE Architecture Overview
LTE Architecture OverviewLTE Architecture Overview
LTE Architecture Overview
 
SRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFB
SRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFBSRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFB
SRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFB
 
lte physical layer overview
 lte physical layer overview lte physical layer overview
lte physical layer overview
 
Csfb (circuit switch fall back)
Csfb (circuit switch fall back)Csfb (circuit switch fall back)
Csfb (circuit switch fall back)
 
VoLTE Interfaces , Protocols & IMS Stack Explained
VoLTE Interfaces , Protocols & IMS Stack ExplainedVoLTE Interfaces , Protocols & IMS Stack Explained
VoLTE Interfaces , Protocols & IMS Stack Explained
 
4G LTE full tutorial
4G LTE full tutorial4G LTE full tutorial
4G LTE full tutorial
 
LTE - Long Term Evolution
LTE - Long Term EvolutionLTE - Long Term Evolution
LTE - Long Term Evolution
 
5GC Registration Failure Codes
5GC Registration Failure Codes5GC Registration Failure Codes
5GC Registration Failure Codes
 

Viewers also liked

Introduction to Mobile Core Network
Introduction to Mobile Core NetworkIntroduction to Mobile Core Network
Introduction to Mobile Core Networkyusufd
 
LTE and EPC Specifications
LTE and EPC SpecificationsLTE and EPC Specifications
LTE and EPC Specificationsaliirfan04
 
Best practices-lte-call-flow-guide
Best practices-lte-call-flow-guideBest practices-lte-call-flow-guide
Best practices-lte-call-flow-guideMorg
 
Call flow and MS attach in LTE
Call flow and MS attach in LTECall flow and MS attach in LTE
Call flow and MS attach in LTEShashank Asthana
 
WiMAX & LTE Network Introduce For Swift
WiMAX & LTE Network Introduce For SwiftWiMAX & LTE Network Introduce For Swift
WiMAX & LTE Network Introduce For SwiftGozie Lucas ubaozo
 
Wcdma Core Network Introduction
Wcdma Core Network IntroductionWcdma Core Network Introduction
Wcdma Core Network Introductionguest1f85dd
 
Policy and Charging Control - LTE / HSPA / EPC ‘knowledge nuggets’
Policy and Charging Control - LTE / HSPA / EPC ‘knowledge nuggets’Policy and Charging Control - LTE / HSPA / EPC ‘knowledge nuggets’
Policy and Charging Control - LTE / HSPA / EPC ‘knowledge nuggets’4G-Seminar
 
What is PCRF? – Detailed PCRF architecture and functioning
What is PCRF? – Detailed PCRF architecture and functioningWhat is PCRF? – Detailed PCRF architecture and functioning
What is PCRF? – Detailed PCRF architecture and functioningMahindra Comviva
 
Huawei hss9860 v900 r008c20 production description
Huawei hss9860 v900 r008c20 production descriptionHuawei hss9860 v900 r008c20 production description
Huawei hss9860 v900 r008c20 production descriptionRabih Kanaan,PMP
 
Ims call flow
Ims call flowIms call flow
Ims call flowMorg
 
IP Multimedia Subsystem (IMS)
IP Multimedia Subsystem (IMS)IP Multimedia Subsystem (IMS)
IP Multimedia Subsystem (IMS)Papa Cheikh Cisse
 
Lte Presentation.Ppt
Lte Presentation.PptLte Presentation.Ppt
Lte Presentation.Pptvaimalik
 
Diameter Presentation
Diameter PresentationDiameter Presentation
Diameter PresentationBeny Haddad
 

Viewers also liked (18)

Introduction to Mobile Core Network
Introduction to Mobile Core NetworkIntroduction to Mobile Core Network
Introduction to Mobile Core Network
 
PS Core Presentation
PS Core PresentationPS Core Presentation
PS Core Presentation
 
LTE and EPC Specifications
LTE and EPC SpecificationsLTE and EPC Specifications
LTE and EPC Specifications
 
Best practices-lte-call-flow-guide
Best practices-lte-call-flow-guideBest practices-lte-call-flow-guide
Best practices-lte-call-flow-guide
 
Call flow and MS attach in LTE
Call flow and MS attach in LTECall flow and MS attach in LTE
Call flow and MS attach in LTE
 
WiMAX & LTE Network Introduce For Swift
WiMAX & LTE Network Introduce For SwiftWiMAX & LTE Network Introduce For Swift
WiMAX & LTE Network Introduce For Swift
 
Wcdma Core Network Introduction
Wcdma Core Network IntroductionWcdma Core Network Introduction
Wcdma Core Network Introduction
 
Lte optimization
Lte optimizationLte optimization
Lte optimization
 
Policy and Charging Control - LTE / HSPA / EPC ‘knowledge nuggets’
Policy and Charging Control - LTE / HSPA / EPC ‘knowledge nuggets’Policy and Charging Control - LTE / HSPA / EPC ‘knowledge nuggets’
Policy and Charging Control - LTE / HSPA / EPC ‘knowledge nuggets’
 
IMS Presentation
IMS PresentationIMS Presentation
IMS Presentation
 
What is PCRF? – Detailed PCRF architecture and functioning
What is PCRF? – Detailed PCRF architecture and functioningWhat is PCRF? – Detailed PCRF architecture and functioning
What is PCRF? – Detailed PCRF architecture and functioning
 
Huawei hss9860 v900 r008c20 production description
Huawei hss9860 v900 r008c20 production descriptionHuawei hss9860 v900 r008c20 production description
Huawei hss9860 v900 r008c20 production description
 
Gsm architecture
Gsm architecture Gsm architecture
Gsm architecture
 
4g technology
4g technology4g technology
4g technology
 
Ims call flow
Ims call flowIms call flow
Ims call flow
 
IP Multimedia Subsystem (IMS)
IP Multimedia Subsystem (IMS)IP Multimedia Subsystem (IMS)
IP Multimedia Subsystem (IMS)
 
Lte Presentation.Ppt
Lte Presentation.PptLte Presentation.Ppt
Lte Presentation.Ppt
 
Diameter Presentation
Diameter PresentationDiameter Presentation
Diameter Presentation
 

Similar to Introduction to Evolved Packet Core Networks

Sae epc overview
Sae epc overviewSae epc overview
Sae epc overviewInam Khosa
 
152763323 lte-interview-question
152763323 lte-interview-question152763323 lte-interview-question
152763323 lte-interview-questionHassan Daud
 
4G EPC architecture by saurav sarker
4G EPC architecture by saurav sarker4G EPC architecture by saurav sarker
4G EPC architecture by saurav sarkerSaurav Sarker
 
Lte interview questions
Lte interview questionsLte interview questions
Lte interview questionsGangaprasadT
 
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...csandit
 
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...csandit
 
Amir ahmadian tlt-6507-seminar report final version-
Amir ahmadian tlt-6507-seminar report final version-Amir ahmadian tlt-6507-seminar report final version-
Amir ahmadian tlt-6507-seminar report final version-Amir Mehdi Ahmadian
 
Practical aspects of lte design and deployment
Practical aspects of lte design and deploymentPractical aspects of lte design and deployment
Practical aspects of lte design and deploymentDr. Ayman Elnashar, PhD
 
Traffic offloading impact on the performance
Traffic offloading impact on the performanceTraffic offloading impact on the performance
Traffic offloading impact on the performanceIJCNCJournal
 
Day 1 LTE Technology Overview
Day 1 LTE Technology OverviewDay 1 LTE Technology Overview
Day 1 LTE Technology Overviewmahesh savita
 

Similar to Introduction to Evolved Packet Core Networks (20)

Sae epc overview
Sae epc overviewSae epc overview
Sae epc overview
 
EVERYTHING IN LTE
EVERYTHING IN LTEEVERYTHING IN LTE
EVERYTHING IN LTE
 
4g interview-question
4g interview-question4g interview-question
4g interview-question
 
152763323 lte-interview-question
152763323 lte-interview-question152763323 lte-interview-question
152763323 lte-interview-question
 
4G EPC architecture by saurav sarker
4G EPC architecture by saurav sarker4G EPC architecture by saurav sarker
4G EPC architecture by saurav sarker
 
Lte interview questions
Lte interview questionsLte interview questions
Lte interview questions
 
Lte basic
Lte basicLte basic
Lte basic
 
Lte technology
Lte technologyLte technology
Lte technology
 
Lte questions adv
Lte questions advLte questions adv
Lte questions adv
 
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...
 
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...
QOS-B ASED P ERFORMANCE E VALUATION OF C HANNEL -A WARE /QOS-A WARE S CHEDULI...
 
Amir ahmadian tlt-6507-seminar report final version-
Amir ahmadian tlt-6507-seminar report final version-Amir ahmadian tlt-6507-seminar report final version-
Amir ahmadian tlt-6507-seminar report final version-
 
Long Term Evolution
Long Term EvolutionLong Term Evolution
Long Term Evolution
 
Practical aspects of lte design and deployment
Practical aspects of lte design and deploymentPractical aspects of lte design and deployment
Practical aspects of lte design and deployment
 
J0343073079
J0343073079J0343073079
J0343073079
 
Traffic offloading impact on the performance
Traffic offloading impact on the performanceTraffic offloading impact on the performance
Traffic offloading impact on the performance
 
LTE optimization
LTE optimizationLTE optimization
LTE optimization
 
Day 1 LTE Technology Overview
Day 1 LTE Technology OverviewDay 1 LTE Technology Overview
Day 1 LTE Technology Overview
 
Launch a Successful LTE Footprints in Bangladesh
Launch a Successful LTE Footprints in BangladeshLaunch a Successful LTE Footprints in Bangladesh
Launch a Successful LTE Footprints in Bangladesh
 
Digital network lecturer7
Digital network  lecturer7Digital network  lecturer7
Digital network lecturer7
 

More from Inam Khosa

Project Communication Management
Project Communication ManagementProject Communication Management
Project Communication ManagementInam Khosa
 
Integrated Project Management
Integrated Project ManagementIntegrated Project Management
Integrated Project ManagementInam Khosa
 
IMS Service Control Model
IMS Service Control ModelIMS Service Control Model
IMS Service Control ModelInam Khosa
 
Policy control in epc
Policy control in epcPolicy control in epc
Policy control in epcInam Khosa
 
Project Management Overview
Project Management OverviewProject Management Overview
Project Management OverviewInam Khosa
 
IP Multimedia Subsystems Overview - My Training on IMS
IP Multimedia Subsystems Overview - My Training on IMSIP Multimedia Subsystems Overview - My Training on IMS
IP Multimedia Subsystems Overview - My Training on IMSInam Khosa
 
Long Term Evolution and EPC
Long Term Evolution and EPCLong Term Evolution and EPC
Long Term Evolution and EPCInam Khosa
 

More from Inam Khosa (7)

Project Communication Management
Project Communication ManagementProject Communication Management
Project Communication Management
 
Integrated Project Management
Integrated Project ManagementIntegrated Project Management
Integrated Project Management
 
IMS Service Control Model
IMS Service Control ModelIMS Service Control Model
IMS Service Control Model
 
Policy control in epc
Policy control in epcPolicy control in epc
Policy control in epc
 
Project Management Overview
Project Management OverviewProject Management Overview
Project Management Overview
 
IP Multimedia Subsystems Overview - My Training on IMS
IP Multimedia Subsystems Overview - My Training on IMSIP Multimedia Subsystems Overview - My Training on IMS
IP Multimedia Subsystems Overview - My Training on IMS
 
Long Term Evolution and EPC
Long Term Evolution and EPCLong Term Evolution and EPC
Long Term Evolution and EPC
 

Introduction to Evolved Packet Core Networks

  • 1. SAE-EPC Introduction Inam Ullah Head of Product Development
  • 2. Contents What is SAE/EPC SAE Advantages SAE Architecture Description of SAE Components Services in EPS Networks
  • 3. What is SAE/EPC System Architecture Evolution (aka SAE) is the core network architecture of 3GPP's LTE wireless communication standard SAE is the evolution of the GPRS Core Network, with some differences: Simplified architecture All-IP Network (AIPN) Support for higher throughput and lower latency radio access networks (RANs) Support for, and mobility between, multiple heterogeneous access networks, including E-UTRA (LTE and LTE Advanced air interface), 3GPP legacy systems (for example GERAN or UTRAN, air interfaces of GPRS and UMTS respectively), but also non-3GPP systems (for example WiMAX or cdma2000)
  • 4. SAE - Advantages Improved data capacity: With 3G LTE offering data download rates of 100 Mbps, and the focus of the system being on mobile broadband, it will be necessary for the network to be able to handle much greater levels of data. To achieve this it is necessary to adopt a system architecture that lends itself to much grater levels of data transfer. All IP architecture: When 3G was first developed, voice was still carried as circuit switched data. Since then there has been a relentless move to IP data. Accordingly the new SAE, System Architecture Evolution schemes have adopted an all IP network configuration. Reduced latency: With increased levels of interaction being required and much faster responses, the new SAE concepts have been evolved to ensure that the levels of latency have been reduced to around 10 ms. This will ensure that applications using 3G LTE will be sufficiently responsive. Reduced OPEX and CAPEX: A key element for any operator is to reduce costs. It is therefore essential that any new design reduces both the capital expenditure (CAPEX)and the operational expenditure (OPEX). The new flat architecture used for SAE System Architecture Evolution means that only two node types are used. In addition to this a high level of automatic configuration is introduced and this reduces the set-up and commissioning time.
  • 5.
  • 6. Description of SAE Components LTE SAE Evolved Packet Core, EPC consists of four main elements as listed below: Mobility Management Entity –MME Serving Gateway –SGW Packet Gateway –PGW Policy Charging and Rule Function -PCRF
  • 7. Mobility Management Entity, MME The MME is the main control node for the LTE SAE access network, handling a number of features: Idle mode UE tracking Bearer activation / de-activation Choice of SGW for a UE Intra-LTE handover involving core network node location Interacting with HSS to authenticate user on attachment and implements roaming restrictions It acts as a termination for the Non-Access Stratum (NAS) Provides temporary identities for UEs The SAE MME acts the termination point for ciphering protection for NAS signaling. As part of this it also handles the security key management. Accordingly the MME is the point at which lawful interception of signaling may be made. Paging procedure The S3 interface terminates in the MME thereby providing the control plane function for mobility between LTE and 2G/3G access networks. The SAE MME also terminates the S6a interface for the home HSS for roaming UEs. It can therefore be seen that the SAE MME provides a considerable level of overall control functionality.
  • 8. Serving Gateway, SGW: The Serving Gateway, SGW, is a data plane element within the LTE SAE. Its main purpose is to manage the user plane mobility and it also acts as the main border between the Radio Access Network, RAN and the core network. The SGW also maintains the data paths between the eNodeBs and the PDN Gateways. In this way the SGW forms a interface for the data packet network at the E-UTRAN. Routing and forwarding user data packets acts as mobility anchor for the user plane during inter-eNB handovers and for mobility between LTE and other 3GPP for idle state UEs, terminates the DL data path and triggers paging when DL data arrives for the UE performs replication of the user traffic in case of lawful interception.
  • 9. PDN Gateway, PGW: Like the SGW, the Packet Data Network Gateway (PDN GW) is the termination point of the packet data interface towards the Packet Data Network(s). As an anchor point for sessions towards the external Packet Data Networks, the PDN GW supports: Policy enforcement features (applies operator-defined rules for resource allocation and usage) Packet filtering (for example, deep packet inspection for application type detection) Charging support (for example, per-URL charging) One bearer, a datapath between a UE and a PDN, has three segments: Radio bearer between UE and eNodeB Data bearer between eNodeB and SGW Data bearer between SGW and PGW
  • 10. Policy and Charging Rules Function, PCRF: the Policy and Charging Enforcement Function(PCEF) is the generic name for the functional entity that supports service data flow detection , policy enforcement and flow-based charging. The Application Function (AF) represents the network element that supports applications that require dynamic policy and/or charging control. In the IMS model, the AF is implemented by the Proxy Call Session Control Function (P-CSCF).
  • 11. Services in IMS Network
  • 12. End