EPC Features Part 1

Introduction

Introduction

› The features described here are ordered following the Road Map Strategy as written in the document:

› EPC Roadmap 4/224 01-FGB 101 256 Uen, Rev F

All features are considered as “basic” by default. When a feature is “optional” it will be written for each case.

Why learn about EPC Features?

Scope and Objectives

Scope and Objectives

On completion of this module you will be able to:

›List and describe existing basic and optional Network Features in an EPC optional Network Features in an EPC solution.

›Analyze the Feature List and Feature Description documents for the different nodes and releases in EPC.

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Overview

EPC Features (2009B & 2010A)› LTE access support

• Intra-pool S1 mobility,

• X2 mobility

• Auto-configuration of LTE base stations

• Idle mode support

• EEA1/EIA1 NAS integrity protection & encryption

• MME pooling

• SGW and PGW selection

› User management• LTE subscriber management with HSS

• Common user data support for GSM/WCDMA/LTE

• HLR integration with HSS and CUDB

› IPv4/IPv6• IPv4 transport

• IPv6 user services (MME, CPG/SGW)

• Dual-stack IPv4/IPv6 user services (MME, CPG/SGW)• Access restrictions

• Basic LTE RAN support as in 2009B using MPG

• S1 mobility with SGW and MME relocation using CPG

• PDN GW/Serving GW split (S5/GTP) using CPG

• Multiple PDN connections per terminal using CPG

• MME TA list management – static and adaptive population

• MME support for Automatic Neighbor Relations (ANR)

• Dual-stack IPv4/IPv6 user services (MME, CPG/SGW)

› Service management• Service Aware Bandwidth Management using SASN

• Fair Usage Policy Control in SAPC

• Support for layered User Management architecture

• Dynamic Policy Control (Rx, Gx) using SAPC

• Network-initiated dedicated LTE bearers using CPG

• e2e bandwidth management including QoS modification

• Event Notification over Gx/Rx

• Converged Policy Controller (SAPC) for mobile and fixed access

EPC Features (2009B & 2010A)

› O&M• EPC FM support (incl OSS-RC)

• EPC PM support (incl OSS-RC)

• Integrated Traffic Capture (ITC) in MME

• Event-based Monitoring (EBM) in MME for efficient Service

• Real-time Service Performance tracking by EBM

› Mobile Packet GW (MPG) introduction• As option for combined PDN GW/Serving GW

• Full utilization of legacy GGSN functionality for LTE

› IRAT mobility• LTE-WCDMA session continuity (Gn) using CPG

• 3G Direct Tunnel support (Lu)• UE Trace support in MME for NAS signaling

• Cell Trace mapping in MME

• Lawful intercept support

› Performance monitoring• Session resilience

• 3G Direct Tunnel support (Lu)

• LTE-GSM session continuity (Gn) using CPG

• LTE-CDMA session continuity (MME support)

› Charging• Gy online charging in MPG

• Offline charging, CDR generation (Gz) in MPG and CPG

• Offline charging, streaming data (Rf) in CPG/SGW

EPC/LTE Architecture for 3GPP

MME

IP networks

S3

HLR/HSS

PCRF

S11

Gr

Gx

S4

S6a

SGi

Serving

PDN GW

Gxc

S5

MME

S1-MME S1-U

LTE

eNodeB

SGSN

Iu CPGb

2G 3G

S3

BSC

BTS

RNC

Node B

Iu UP

S11

S10

X2

Iur

Serving GW

BASIC 2G/3G Interfaces

IP networksHLR/HSS

PCRFGr

Gx

Gn

Gi

•FAJ 122 943 Gn Interface

•FAJ 122 737 Gp InterfaceGGSN

SMS-G

Gd

GGSN

Gp

OTherOperator

Gb

2G

BSC

BTS

•FAJ 122 729 Gb Interface

•FAJ 122 737 Gp Interface

•FAJ 122 940 Gd Interface

•FAJ 121 567 Gr Interface•FAJ 121 86 Iu Interface (3G only)

Iu CP

3G

RNC

Node B

Iu UP

Iur

SGSN

2G / 3G EDGE / HSPA / LTE Evolution

MME

IP networks

S3

HLR/HSS

PCRF

S11

Gr

Gx

S4

S6a

SGi

Serving

PDN GW

Gxc

S5

MME

S1-MME S1-U

LTE

eNodeB

S3

Iu UP

S11

S10

X2

Serving GW

•FAJ 121 0479 MME Interfaces

•FAJ 122 729 Gb Interface

•FAJ 121 86 Iu Interface (3G only)

Gb

2G

BSC

BTS

Iu CP

3G

RNC

Node B

Iu UP

Iur

SGSN

LTE Access Support Features

EPC S1/X2 MOBILITY

MME

MME

S-GW

eNB

MME

S-GW

eNBeNBX2

S-GW

eNB

8

S-GW

Scenario Technical Term Commercial Term TA eNB MME S-GW

1 Intra-MME S1 HO S1 mobility Same Relocated Same Same2 Intra-MME TAU in S1 HO S1 mobility with Tracking Area Update Updated Relocated Same Same3 Inter-MME S1 HO S1 mobility with MME Reselection Same Relocated Relocated Same4 Inter-MME TAU with S-GW relocation in S1 HO S1 mobility with MME and S-GW Reselection Updated Relocated5 Intra-MME TAU in X2 HO X2 mobility with Tracking Area Update Updated Relocated Same Same6 Intra-MME X2 HO X2 mobility Same Relocated Same Same7 Intra-MME TAU with S-GW relocation in X2 HO X2 mobility with S-GW Reselection Updated Relocated Same Relocated8 Intra-MME TAU with S-GW relocation in S1 HO S1 mobility with S-GW Reselection Updated Relocated Same Relocated

Relocated

eNBeNB

eNBeNB

eNBeNB

S-GW Service Area

Tracking Area

1 2 3 eNBX2 X2

5

6

eNB

7 4

S1 Mobility with MME & SGW Reselection

MME

MME

S-GW

MME

S-GWS-GW

eNBeNB

eNBeNB

eNBeNB

S-GW Service Area

Tracking Area

eNB

X2 Mobility with SGW Reselection

MME

MME

S-GW

eNBeNB

eNB

eNB

S-GW Service Area

Tracking Area

eNBX2

S-GW

S-GW Service Area

EPC S1/X2 MOBILITY

S1 Mobility

› FAJ 122 725, Mobility Management (MME)› FAJ 121 0785/1 Serving Gateway support (GGSN-MPG Optional)› FAJ 121 0554 LTE Access (CFG)

X2 Mobility

› FAJ 122 725, Mobility Management (MME)› FAJ 121 0785/1 Serving Gateway support (GGSN-MPG Optional)› FAJ 121 0573 Inter e-NodeB Mobility (CFG)

Auto-configuration of E-Node

DNS

Query MME IP?

•SCTP Asociation set up

•S1 set up

•Based on: FAJ 121 0479, MME Interfaces

EPC Idle Mode Support• EMM-DEREGISTERED

(the UE is unreachable by the MME)

• EMM-REGISTERED (the UE is attached and connected to a PDN)

•Authentication and Security procedures, based on encryption algorithms EEA0/EEA1 and integrity algorithm EIA1.

•ECM-CONNECTED •ECM-CONNECTED (signaling connection between the UE and the MME)

•ECM-IDLE (no signaling connection between the UE and the MME)

Features:

•FAJ 122 725, Mobility Management (MME)

•FAJ 121 0785/1 Serving Gateway support (GGSN – MPG) (Optional)

•FAJ 121 0567 Idle Mode Support (CFG)

NAS ESM Information

› The NAS EPS Session Management (ESM) information procedure enables: – UE to send ESM information (APN, protocol configuration options, or both) to the MME during the

attach procedure.– UE to request which APN to use for the default bearer (if not, the UE uses the default APN

defined in the subscription data information instead)

› Benefit:– provides possibility for the UE to suggest an APN at connectivity request and to provide privacy – provides possibility for the UE to suggest an APN at connectivity request and to provide privacy

for the ESM information if ciphering is enabled in the network

› The UE initiates the ESM information procedure to suggest an APN or to send encrypted protocol configuration options to the MME, or both.

Pool

Pool (II)

Features:

FAJ 121 0476 MME Pool

FAJ 121 788 SGSN Pool for GSM

FAJ 121 0049 SGSN Pool for WCDMA

FAJ 121 0455 SGSN Support for MSC in Pool

EPC SGW and PGW selection

MME

HLR/HSS

S11

S6a

Serving

PDN GW

S5

PDN Gateway Selection

•APN on User profile?

•If not go to DNS

Serving Gateway Selection

•TA based on UE location

•Query to DNS based on TADNS

Query PDN/S5 IP?

MME

S1-MME S1-U

LTE

eNodeB

S11

S10

X2

Serving GW

•Query to DNS based on TA

•Features:

•FAJ 121 0552, PDN and Serving Gateway Selection

Query TA -> SGW?

DNS

PGW-Initiated EPS Bearer Modification

Description:

› PDN Gateway-initiated EPS bearer modification without bearer QoS, caused by changes in the PCRF, related to:– APN AMBR (Aggregated Maximum Bit Rate)– TFT (Traffic Flow Template)

› PDN Gateway initiates the modification › MME sends EPS bearer modification requests to the eNodeB and UE

Selective Equivalent PLMNs

Summary:› Selective Equivalent PLMNs enables the steering of the UE into selecting a PLMN

network within the shared network group of networks at cell selection and re-selection, which is used for shared networks

› Operators can share network infrastructure, based onA. Common Shared Network or B. Geographically Split NetworksB. Geographically Split Networks

Benefits:› Shared networks enables operators to share the radio infrastructure or coverage (Good

coverage is essential)› Shared networks can provide good coverage quickly and at lower cost

Static IP Address Allocation (HSS based)

› HSS based Static IP address allocation for the UEs is supported on the S6a and S11 interface.

Benefit› Important for GSM/WCDMA/CDMA-operators using Static IP address allocation for

corporate customers. › Same provisioning method for LTE, imply low operational cost. › Same provisioning method for LTE, imply low operational cost.

CGI 1

CGI 2

GTP ULI Support

GTP User Location IE: Including ECGI and TAI at Create Session Request, Modify bearer Request, Delete Session Request,Create Bearer Response, Update Bearer response *)

MME

S-GW

eNodeB

SACC

CGI 2

Benefits & Usability:› Valuable addition to the existing AACE (Access Aware Core Edge) functionality› Improving the SACC solution with services related to home zone and positioning › Home zone tariffs differentiation possibilities› Positioning services e.g. advertising

*) also include ULI for TAU/RAU/X2- and over Enhanced SRNS Relocation procedure if the PGW has requested location information change reporting

MMES-GW

eNodeB

Multiple Connections to PDNs

S-GW

S1-MME

PDNPDNGW

S1-U S5/S8

UE

S-GW

S11LTE

PDN2PDNGW

S1-U S5/S8

UE PDNPDN1MME

P-GWS-GWeNodeB S-GWeNodeB P-GWS-GWeNodeB

MME

eNodeB S-GW

MME

eNodeB P-GWS-GW

MME

eNodeB

› Multiple PDN connections to UE to run applications simultaneously with different PDNs

› When the UE requests a service a new PDN connection is established, if necessary

› The maximum number of simultaneous PDN connections with one bearer each is 11

TA List Management

Static TA list

Latest visited TA

› Reduces signaling in Idle Mode› No TAU as long as within a TAI list› Contains two parts:

– Static list:› The MME contains a global (e.g. HPLMN) set of TA lists, fetched from the DNS› The MME selects a TA list applicable to the UE (location)

– Adaptive – last known TA › Suitable for UEs with habitual patterns› Is used without any configuration needed

ANR Support

› Benefit– ANR (Automatic Neighbor Relations) eliminates the

need for initial configuration of neighbor relation lists in DNS

› Functionality– eNodeB checks and discovers undefined LTE cell

neighbors, at HO S1-MMES1-US1-U

MME

1), 4) 2), 3)

neighbors, at HO – As soon as the eNodeB detects a new neighbor

eNodeB then the Source eNodeB builds the eNodeB internal NRT, Neighbor Relation Table

– MME will relay cell neighbor’s information over S1– X2 interfaces will be setup automatically with

neighbor eNodeB, if missing– When the UE detects a new cell (Target), a

handover request is sent to the Source eNodeB.

S1-MME

X2

Source Target

eNodeB eNodeB

1), 3) ”eNB CONFIGURATION TRANSFER”2), 4) ”MME CONFIGURATION TRANSFER”

EPC User Management Features

EPC User Management

› LTE subscriber management with HSS• FAJ 901 710/1 R1A, Mobility between E-UTRAN

and 2G/3G Accesses (Optional)

› Common user data support for GSM/WCDMA/LTE

› Common Features:

› MME Applies to all the capacities:• FAJ 121 0479, MME Interfaces

› HSS Applies to all the capacities• FAJ 901 657/1 R1A, EPC Subscription Management• FAJ 901 648/1 R1A Packet Session Manager

› HLR integration with HSS and CUDB• FAJ 901 707/1 R1A HSS Front-End Deployment

(Optional)

• FAJ 901 657/1 R1A, EPC Subscription Management

• FAJ 901 658/1 R1A, EPC Subscription Profile Configuration

• FAJ 901 659/1 R1A, EPC APN Configuration

• FAJ 901 660/1 R1A, EPC Authentication Support

• FAJ 901 661/1 R1A, EPC Mobility Management

• FAJ 901 662/1 R1A, EPC User Profile Management and Service Authorization

• FAJ 901 708/1 R1A, Roaming Restriction based on VPLMN Identity

• FAJ 901 709/1 R1A, EPC Operator Determined Barring

EPCIPv4/IPv6 Features

EPC IPv4/IPv6 Features

MME

IP networks

S3

HLR/HSS

PCRF

S11

Gr

Gx

S4

S6a

SGi

Serving

PDN GW

Gxc

S5 Transport

SMS-GGd

MME

S1-MME S1-U

LTE

eNodeB

Iu CPGb

2G 3G

S3

BTS

RNC

Node B

Iu UP

S11

S10

X2

Iur

Serving GW

•FAJ 121 929, SS7 Over IP (SIGTRAN)

•FAJ 121 498, Gb over IP

User

•FAJ 121 342, IPv6 User Plane (MME)

•FAJ 121 716/1 GGSN IPv6 User Plane

•FAJ 121 0638 IPv6 User Plane

SGSN

BSC

MSCGs

Summary

Summary

› There are featuresconsidered as “basic” bydefault.

› Some of the features are“optional”, so it is importantto know about their existence.

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More Information

› EPC Roadmap

› SAE/EPC Solution Overview

› Features in SGSN-MME 2010A for LTE, WCDMA, and GSM

› GGSN-MPG 2010A Feature Description

› CPG 2010A Feature Description

› SASN 2010A Feature List

› SAPC 2010A Feature List

Quiz

1) The Pool concept can be defined for the following access types:

a) 2G/3Gb) LTE onlyc) 3G/LTE

© Ericsson AB 2009 | Ericsson Internal | X (X) | Date

d) All access types (correct)

Quiz

2) What is correct about the S1 and X2 mobility? a) The X2 mobility is controlled and coordinated by MME.b) The X2 mobility is customer definedc) The S1 mobility is controlled and coordinated by MME. (correct)d) The S1 mobility is controlled by eNodeB,

3) Which feature solves this affirmation: "the high number of eNodeBs

© Ericsson AB 2009 | Ericsson Internal | X (X) | Date

3) Which feature solves this affirmation: "the high number of eNodeBs connected to an MME, configuration becomes complex and demanding" :

a) DNS Optimizationb) 3GDTc) Policy Charging and Controld) S1 Autoconfiguration (correct)

Quiz

4) What nodes are involved in the EPC Idle mode support? a) MME and SGWb) MME and PGWc) MME, SGW and PGW (correct)d) MME only

5) Which feature applies for this statement? “It enables automatic

© Ericsson AB 2009 | Ericsson Internal | X (X) | Date

5) Which feature applies for this statement? “It enables automatic configuration of neighbor relation lists in the eNodeBs”:

a) ANR (correct)

b) 3GDTc) S1 Autoconfigurationd) Policy Charging and Control

Quiz

6) What feature(s) is needed to support the user plane for ALL IP on EPC.

a) Sigtran b) Gb Over IP c) Gb compressiond) IPv6 (correct)

© Ericsson AB 2009 | Ericsson Internal | X (X) | Date

7) What optional feature is needed for convergence on HSS? a) FAJ 901 657/1 R1A, EPC Subscription Management

b) FAJ 901 658/1 R1A, EPC Subscription Profile Configurationc) FAJ 901 710/1 R1A, Mobility between E-UTRAN and 2G/3G Accesses (correct)d) FAJ 901 659/1 R1A, EPC APN Configuration

Pronunciation guideEPC e_p_cIPv4/IPv6 IP_version_4_IP_version_6GW gatewayIRAT iratRAN-CN ran_C_NMME M_M_E3GPP 3_G_P_PeNodeB e_node_bDNS D_N_S

QoS quality of serviceHSS H_S_SPCRF P_C_R_FAMBR A_M_B_RMSC M_S_CPLMN P_L_M_NFDD F_D_DMS M_S (in connection with full name)GTP ULI G_T_P_U_L_I

© Ericsson AB 2009 | Ericsson Internal | X (X) | Date

NAS nasEEA E_E_AEIA E_I_ANAS EPS nas_E_P_SESM E_S_MPDN P_D_NAPN A_P_NIE I_EBSC B_S_CRNC R_N_CLTE L_T_ESGW Serving gateway

GTP ULI G_T_P_U_L_IANR A_N_RPCI P_C_IECGI E_C_G_IGSM/WCDMA/LTE G_S_M_W_C_D_M_A_L_T_ECUDB cud_BLTE-SAE L_T_E_S_A_E