chapter 1. epc overview ed00 - mobliy

SAMSUNG EPC System SAMSUNG EPC System O iO i

SAMSUNG EPC System SAMSUNG EPC System O iO iOverviewOverviewOverviewOverview

Contents

LTE Network Configuration

LTE/EPC structural features and functionsLTE/EPC structural features and functions

MME, S-GW, P-GW Functions

SAMSUNG EPC ifi i d l hSAMSUNG EPC specifications and structural shapes

Redundancy

2

LTE Network Architecture eNB: E-UTRAN Node B ePDG: evolved Packet Data Gateway GGSN: Gateway GPRS Support Node GTP: GPRS Tunneling Protocol SGSN: Serving GPRS Support NodePDN

PCRFGGSN

SGi

Gx

RxGi

SGSN: Serving GPRS Support Node MME: Mobility Management Entity PDN: Packet Data Network

PDNGateway

PCRF

Pre-R8 SGSN

GGSN

S5

Gx

Gn/Gp S2b

Gn/Gp GxbIu Gx

ServingGateway

HSS

SGSN

MSC Server S11

S5

SGs

ePDG

Sv

Gs

S4

S2a Gxa

AAAS d

S6b

MMEHSS

R8 SGSN

S6a

S1-U

S1-MME

SGs

Trusted Non-3GPP IP Access

S3

WCDMAIu-C

S12AAA

SWd

SWx

SWnSTb SWa

eNodeB eNodeB

LTE-Uu

X2

LTEWCDMA Non-3GPP

UntrustedNon-3GPP IP Access

WCDMA/HSPA

3

UE

LTE/EPC Structural Features

and Functions

4

EPC Session/bearer establishmentAlways-on

UE Authentication, IP address allocation(session establishment), default bearer establishment

Dedicated bearer can be set or release by UE or PCRF

There is no exist UE context in E-UTRAN for UE in the ECM-IDLE statebut session and bearer context in MME, S-GW, P-GW is maintained., ,

UE state is switched to active when paging by service request or network

MME< Active State> MME

eNB S GW P GW

UE

2 or more IP

session can be

set by UEeNB S-GW P-GW

1 IP Session (1default bearer + 0 or more dedicated bearer)

set by UE

request.

MME< Idle State> MME

UESession

between S-Gw

< Idle State>

5

eNB S-GW P-GW

1 IP Session

and P-GW is

maintained.

Connection Configuration between Access and Core

Original Access – Core connection

Hierarchical structure (1 : N connection)

Access in LTE – Core connection

Core system is connected by pool structure, N:M

M d ibili f NB i ll d di ib d diManagement and responsibility of eNB is allocated to core system distributed according

to UE.

MME pool 1 MME pool 2< Previous Access-Core system> < Access-Core configuration in LTE >

Core system

MME

BSC/RNC

● ● ●

Pool Area 1 Pool Area 2● ● ●

BSC/RNC

6

BTS/NodeB eNodeB

Mobility Management for LTEUE1 TA list

TA2RA1

RNC1MMETA1

UE1 TA list

NB2

SGSNNB1

eNB2

eNB1

TA3* TA (Tracking Area)• Minimum unit : cell

RA2

RNC2eNB4

TA3• possible to make more than one cell in one eNB• the number of cell per one eNB : minimum one, maximum 256개• one TA is consisted of n cells.TA i ll t d b t

NB4NB3

eNB3

dl bili

UE2 TA list

dl bili

• TA is allocated by operator.* TA list • TA list is allocated by MME considering current location of UE.• one TA list is consisted of n TAs.

3G Idle mobility

All UE performed location update on Fixed RA.

EPS Idle mobility

Location update occurred when allocated each UE is outside TA list.

Paging performed in RA which UE updated location.

TA area is maintained fixed area.

TA list allocation to give UE is possible

When UE initiated Attach and TAU, MME

7

,can be allocated TA list.

paging by TA list area allocated to UE

ISR function

ISR (Idle mode Signaling Reduction) to limit signalling during inter-RAT cell-reselection in idle mode

C ll l i TAU/RAU i d dCell-reselection, TAU/RAU count is reduced.

E-UTRAN UE (GERAN/UTRAN supported) is mandatory function.

R8 SGSN supported ISRpp

Pre-R8 SGSN does not supported ISR.

UE registered

HSS

Run periodic update timer.If timer expires, detach implicitly

If UE cannot perform periodic update, deactivate ISR

TAU

S-GW PDN-GW PDN

MMEE-UTRANHSSGUTI, TA

Session Information

TAU

SGSNUTRAN/GERANP-TMSI, RA

UE registeredRun periodic update timer.

If timer expires, detach implicitly If UE cannot perform periodic update,

RAU

8

deactivate ISR

CSFB (Circuit Switch Fall Back)MSC transmit Paging request to MME. Then It sends to UE through eNB.Paging response is transmitted to CS domain. It provides voice service in CS domain.MSC needs 3GPP Rel.8 support for interworking with MME.

SGs interface (SGsAP/SCTP/IP)

NodeB/RNC SG

MSC GMSCCS call paging response is sent through RNC in 3G IuCS Voice service

MME

NodeB/RNC SGs

HSSS6a

Dual-modeSingle radio terminal

(Radio mode Transition)

S5

S11S1‐MME

S1‐U


S‐GW P‐GW/GGSNeNB

9

SRVCC (Single Radio Voice Call Continuity)

Possible to handover between LTE and 3G Network during VoIP Call.

MSC needs a 3GPP Rel.8 support for interworking with MME.Sv interface (GTP-C/UDP/IP)

MSC

Nc

Sv

eMSCBICC/RTP

CS voice in 3GIuCS

Voice service

Nc

MME HSS

Sv

Dual-modeSingle radio terminal


NodeB/RNC

S6a SGi

S5VoIP in LTE

S11S1‐MME

S1‐U

10S‐GW P‐GW/GGSN

eNB

Charging FunctionOffline Charging

Support P-GW and S-GW

Volume/time based charging

ApplicationFunction (AF) / g g

Interworking with OFCS (Gz interface: GTP’)

Interworking with AAA(SGi interface: Radius)

CDR generation for each EPC bearer

Policy And Charging

Rule Function

SubscriptionProfile

Repository(SPR)

Online Charging

Rx

Sp

3GPP Specific Charging

(P-GW: PGW-CDR, S-GW: SGW-CDR)

Online Charging

(PCRF) System(OCS)

Service Data Flow Based

Credit Control

GxGy

Support P-GW

Real-time charging by Credit control

Interworking with OCS (Gy interface: Diameter)P-GW

Policy And Charging Enforceme

nt Function (PCEF)

Offline ChargingSystem(OFCS)Gz

SGi

Radius Accounting

(Offline)

S-GW

Ga

참고: S-GW charging– charging for roaming users– Interworking with OFCS and GTP’ protocol

11

Interworking with OFCS and GTP protocol(not interworking with AAA)

– support charging per bearer, not support FBC

DPI-based differentiated QoS & Charging

Off-line/on-line charging

Advanced QoS Control Advanced Charging Feature

Packet flow based bandwidth control Off line/on line charging

Service aware charging per packet flow

PCC based charging

Packet flow based bandwidth control

Application based bandwidth control

PCC based QoS control

Offline / Online charging / PCC rules operation for various tariffs

Gz interface for Offline charging

Gy interface for Online charging

P-GW(GGSN functionality)

PCRFGx

(GTP-C/U)E-UTRAN/UTRANPDN

Gy interface for Online charging

Gx interface for PCC rules operation

S-GW/SGSNOffline Charging System

PDN

Online Charging System

GyGz

Skype

HTTP, Download

FTP

Default bearerBehavior, Heuristic Analysis

Pattern Matching

12

Dedicated bearer

Real-time game

SAMSUNG EPC

Specification & Structurep

13

MME Function

S1-AP 및 NAS signalling

NAS signaling security

Inter CN node signaling for mobility between 3GPP access networks (S3)

Location registration and Paging for Idle mode UE

TA list management, Paging retransmission

NE selection

PDN GW, Serving GW selection

MME selection for handovers with MME change

SGSN selection for handovers to 2G or 3G access network

Roaming for interworking HSS (S6a interface)

UE Authentication

Interworking for Non-3GPP network

14

HRPD interworking (S101 interface) :

- Signaling for HRPD network and Optimized Handover

S-GW Function

Interfacing E-UTRAN for bearer

Local Mobility anchor point for inter-eNodeB Handovery p

Mobility anchor point for inter-3GPP (2G/3G/P-GW)

Packet routing & forwarding

Paging to ECM-Idle mode UE for incoming call

Accounting for inter-operator changing

UL/DL transport level packet marking

15

P-GW FunctionInterfacing external PDN

Mobility anchor point between Non-3GPP and 3GPP

Packet routing & forwarding

UE IP address allocation

Per-user based packet filtering

PCEF (Policy and Charging Enforcement Function) function

UL/DL bearer binding and UL bearer binding verification

Service level charging, gate control, rate enforcement

PCRF interworking and Policy / Charging control

DL rate enforcement based on APN-AMBR, MBR

l l k kUL/DL transport level packet marking

16

HSS / PCRF Function

HSS (Home Subscriber Server)

User id, numbering, addressing storedUser id, numbering, addressing stored

User security information generation

- mutual authentication and encryption for between UE and network

User location information storage

User profile information storage

PCRF (Policy and charging rule function)

S di Q S d h i l G C f S S i l dSending QoS and charging rule to P-GW(PCEF) for SDF (Service Data Flow) and

IP-CAN Session

P-GW (PCEF) is performed QoS and Charging functions according to PCCP GW (PCEF) is performed QoS and Charging functions according to PCC

rule

17

Flexible to allocate CPU Core

MPP #1C lC t l

MPP #2CoreCore CoreCore CoreCore CoreCore

CoreCore CoreCore CoreCore CoreCore

CoreCore CoreCore CoreCore CoreCoreData Data

ControlPlane

Control Plane




CoreCore CoreCore CoreCore CoreCorePlane PlaneCoreCore CoreCore CoreCore CoreCore

Optimization according to control & data plane usage


CC CC CC CC

MPP #1

Control PlaneControl Plane CoreCore CoreCore CoreCore CoreCore

CC CC CC CC

MPP #2

CCoreore CoreCore CoreCore CoreCore



Data Plane

DataPlane




Support 16core per MPP (Multi-core Packet Processor)

Core of MPP performs Signaling processing(Control Plane) and Packet processing(Data Plane).

18

It will be optimized system according to traffic pattern change (M2M, video streaming) in the future. (It can be optimized the number of Core allocation.)

MME SpecificationItem Description

Product MME (Mobility Management Entity)

Rack Dimension (H x W x D) 2 000 x 600 x 800 mmRack Dimension (H x W x D) 2,000 x 600 x 800 mm

Shelf Dimension (H x W x D) 483 x 468 x 577 mm

Subscriber 2M

EPS bearer 6MEPS bearer 6M

call processing performance 6K CPS (attach )

- eNB : 32,000- S-GW : 1,024

allowable number of Nodes- HSS : 300- EIR : 100- WCDMA SGSN : 1,024- WCDMA MSC server : 100

RAID

Number of external interfaces4 x 10G ports and 4 x GE ports

( or Total GE : 8 ports)

R d dLESA : 2:1 LENA 1 1Redundancy LENA : 1:1LEMA : 1:1

Available System configuration- 1Rack 1 shelf 1 system- 1Rack 2 shelf 1 system

19

- 1 Rack 2 shelf 2 system

S-GW SpecificationItem Description

Product S-GW (Serving Gateway)



Throughput 33Gbps

call processing performance 5K CPS (bearer activation / deactivation )call processing performance 5K CPS (bearer activation / deactivation )

EPS bearer 4.5M

allowable number of Nodes

- eNB : 32,000- MME : 4,000

allowable number of Nodes- WCDMA SGSN : 4,000 - P-GW : 4,000

Number of external interfaces12 x 10G ports & 12 x GE ports

(or Total GE : 24 ports)RAID

RedundancyLEDA : 2:1LENA : 1:1 LEMA : 1:1

1Rack 1 shelf 1 systemAvailable System configuration

- 1Rack 1 shelf 1 system- 1 Rack 2 shelf 2 system

20

P-GW SpecificationItem Description

Product P-GW (PDN Gateway)



Throughput 23Gbps (with PCC*)

call processing performance 5K CPScall processing performance 5K CPS

EPS bearer 4.5M

allowable number of Nodes- S-GW : 4,000 - APN : 2,000

Number of external interfaces12 x 10G ports & 12 x GE ports

(or Total GE : 24 ports)

RedundancyLEDA : 2:1 LENA : 1:1

RAID

Redundancy LENA : 1:1 LEMA : 1:1

Available System configuration- 1Rack 1 shelf 1 system- 1 Rack 2 shelf 2 system

* PCC: SDF level QoS, FBC function support

21

Board Types and Functions

Category Function

LESALTE EPC Signaling interface board Assembly- Call processing in the MME- Control of mobility and session

LEMALTE EPC Management board Assembly- 200-Gbps packet switch- System Management

LENALTE EPC Network interface board Assembly- Packet interface- Packet processing (10 GE, 1 XGE (10-Gbps I/F))

LEDALTE EPC Data processing board Assembly- Packet processing and control in the S-GW and P-GW- Software-based packet control using the multi-core packet processor

DPBB-4Data Processing shelf Backplane Board assembly-version 4- Inter-board packet interface- Alarm channel within a shelf backplane

22

MME System ArchitectureMME System ArchitectureEMS

Pkt SwitchMain OAM

LEMA

IPRS

LENA0 LENA1 LESA0 LESA3 LESA6

Call Processing

Call Processing

DIAMETER ALG

DNS Proxy

DIAMETER ALG

DNS Proxy

Call Processing

Subscriber DB

SubscriberDB

SubscriberDB

Pkt I/F Pkt I/F

y y

S1-AP ALG S1-AP ALG S1-AP ALG

GTP-C ALG GTP-C ALG GTP-C ALG

MME/S GW/• IPRS : IP Routing Subsystem

DiameterS1-APGTP-C, DNS

23

MME/S-GW/ DNSHSS/EIR eNB

S-GW System ArchitectureS-GW System ArchitectureEMS

Pkt SwitchMain OAM

LEMA

IPRS

LENA0 LENA4LENA2 LEDA0 LEDA3LENA2 LEDA0

Call Processing

LEDA3

PacketF di

PacketPacketF di

Load Distribution

Load Distribution Protocol

Proxy (GTP’)Call

Processing

Packet Processing

Forwarding

Pkt I/F

Forwarding

Pkt I/F

Forwarding

Pkt I/F

Packet Processing

MME

GaS1-UGTP-C, GTP-U

• IPRS : IP Routing Subsystem

24

MME,P-GW E-UTRAN OFCS

P-GW System ArchitectureP-GW System ArchitectureEMS

Pkt SwitchMain OAM

LEMA

IPRS

LENA0 LENA4LENA2 LEDA0 LEDA3LENA2 LEDA0

Call Processing

LEDA3

Protocol Proxy (DHCP)

Load Distribution

Load Distribution

ProtocolProxy (Diameter)

ProtocolProxy (GTP’)

Call Processing

Packet Processing

PacketForwarding

Pkt I/F

PacketForwarding

Pkt I/F

PacketForwarding

Pkt I/F

Packet Processing

Gx, Gz, Gy, Radius, DHCP

SGi

• IPRS : IP Routing Subsystem

GTP-C, GTP-U

PCRF/ OFCS/

25

S-GWS-GWPCRF/ OFCS/ OCS AAA/

DHCPPDN

redundant configuration

The EPC supports redundancy of the board, process, interface, power supply, and

fan to enhance reliability and availability for the consistent and reliable servicefan to enhance reliability and availability for the consistent and reliable service.

Target Fault description Redundancy method

Board Board power supply failureOther devices failure

redundancy

N:1 redundancy

Interface Physical link failurePhysical port failure

Active/standby

Link aggregation (Link redundancy)

Equal Cost Multi-Path (ECMP)

Internal path Physical link failure -

Power supply Power short circuit power supply redundancyPower supply Power short circuit power supply redundancy

Fan Fan operation failure Redundant fan configuration

27

Redundant structure of LESA, LEDA

Redundancy : LESA, LEDA (2:1)

1) The fault detection block of the LEMA board periodically monitors the1) The fault detection block of the LEMA board periodically monitors the status of all boards in a shelf using the hardware device information.

2) When an active board fails, a standby board detects the fault and switches to the active boardto the active board.

3) After fault is recovered, Active board is performed into Standby mode.(Backup board changed)

Normal Operation Switch Over Non-Revertive mode

LESA0or

Failure A S A AS AActive Active Standby

X

AAfter Recovery

Standby

LESA1or

LESA2or

LESA0or

LESA1or

LESA2or

LESA0or

LESA1or

LESA2or

Backup

or LEDA0

Take over

XBackup

or LEDA1

or LEDA2

or LEDA0

or LEDA1

or LEDA2

or LEDA0

or LEDA1

or LEDA2

28

Redundant structure of LEMA

Redundancy : LEMA (1:1)

1) The two duplicated boards exchange the data required for the redundancy1) The two duplicated boards exchange the data required for the redundancy through the redundant path between the boards.



Normal Operation Backup

Switchover

Fail

Active Standby Standby -> Active

Recovery

LEMA0 LEMA1

ActiveBackupStandby

LEMA0 LEMA1OAM OAM

LEMA0 LEMA1OAM OAMX

Fail LEMA0 LEMA1OAM OAM

LESA0 or LEDA0

LESA1 or LEDA1 LENA0 LENA1 LENA0 LENA1 LENA0 LENA1LESA0 or

LEDA0

LESA1 or LEDA1

LESA0 or LEDA0

LESA1 or LEDA1

29

Redundant structure of LENA

Redundancy : LENA (Board : Dual Active, Interface :)

1) The fault detection block of the LEMA board periodically monitors the1) The fault detection block of the LEMA board periodically monitors the status of all boards in a shelf using the hardware device information.



Normal Operation Switchover Normal Operation

LESA0 LESA1

Active Standby

Back p

LEMA1LEMA0

LESA0 LESA1 or

Active

LEMA1LEMA0

XFail

LESA0 LESA1

ActiveStandby

LEMA1LEMA0

LESA0 or LEDA0

LESA1 or LEDA1

LENA0 LENA1

BackupCP CP

LESA0 or LEDA0

LESA1 or LEDA1

LENA0 LENA1

CP CPX LESA0 or LEDA0

LESA1 or LEDA1

LENA0 LENA1

BackupCPCP

30

Interface RedundancyActive

Active/Standby LEMA

L2-S/W #2

L2-S/W #1

LESA 1

LESA 2

LESA 3 LENA 1

LENA 0Active

Standby

Standby

Active

Active

Backup

Router #1

LEMAL2-S/W #1

LESA 1

LESA 2 LENA 0Active

Active

Active

Active/Standby

Router #1

Link Aggregation

L2-S/W #2LESA 3 LENA 1Active

StandbyBackup

LEMAL2-S/W

LESA 1

LESA 2 LENA 0Active

Active

Active

Router #1

Link Aggregation

gg gLESA 3 LENA 1

Active

StandbyBackup

LEMA

LESA 1

LESA 2 LENA 0Active

Active

ActiveLink Aggregation

Router #1

ECMP

LEMAL2-S/W

LESA 3 LENA 1

Active

Active

StandbyBackup

Router #1

LESA 1

LESA 2 LENA0

Active

ActiveECMPECMP

(Equal Cost Multi-Path)LEMA

LESA 2

LESA 3 LENA 1

LENA 0

StandbyBackup

Router #1

Router #2

Active

Active

LESA 1Active

ECMP Routing table

31

LEMALESA 2

LESA 3 LENA 1

LENA 0

Standby

Active

Backup

Router #1

Router #2

ECMP

Active

Active

Routing tableupdate

chapter 1. epc overview ed00 - mobliy

Documents

ta list ta list

ta list area

ue state

ue context

ue regist

outside ta list

g idle mobilityall ue

current location of