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May 11th, 2009

IEEE CQR 2009 International Workshop Co-Existence of 3G and LTE NetworkDevesh Agarwal, RVP Presales

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Agenda

› Current 2G/3G Wireless Networks› LTE Proposed Architecture› Converged Network › Role of Database at the Core› Summary

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HLR Router

HLR Router

SS7

Subscriber Routing Database

MSC

Core HLR Selection DB

SMSCSMSC

SMSC

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Flat LTE Architecture

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LTE and EPC Architecture Simplified

eNodeB Serving Gateway

PDN Gateway

S5

eNodeB

eNodeB

X2

S1-UX2

MMES1-MME

HSS

S6a(Diameter)

S11

SGi

PCRF

Gx Rx

HSS: Home Subscriber ServerMME: Mobility Management EntityGW: GatewayeNodeB: Enhanced Node BSGW: Serving GatewayPDN: Packet Data NetworkPCRF: Policy and Charging Rules Function

HSS: Home Subscriber ServerMME: Mobility Management EntityGW: GatewayeNodeB: Enhanced Node BSGW: Serving GatewayPDN: Packet Data NetworkPCRF: Policy and Charging Rules Function

Control Plane

User/Data Plane

PDN/Internet

HSSHSSHSS

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HLR/HSS Selection Router (cont)

› HLR/HSS Selection logic at the core

› No more MSC/MSS/MME routing table impact

› Evolution to support migration of subscribers from 3G/2G to LTE

3G 2GNew

LTE Network

HLR 1HLR 1

HLR 2HLR 2

HLR 30HLR 30

HLR 1HLR 1

HLR 2HLR 2

HLR 8HLR 8

HSS 1HSS 1

HSS 2HSS 2

HSS 10HSS 10

MIN/MDN to HLR/HSS mapping table in the Core

MIN01234 HLR 101345 HLR 211234 HSS 1

MSISDN / MDN460022 HLR 1470025 HLR 2470033 HSS 1

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HLR 

Router

HLR/HSS Selection Database

› Phase_1 Phase_2

Wireless2G, 3G

LTEIMS

HLR2HLR1 HSS2HSS1

SLF   DRP

SignalingCore

Wireless2G, 3G, IMS

HLR2HLR1

HLRRouter

HSSn

SignalingCore

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Network Elements and Protocol Access

› Current Network has HLR/MSC/SMSC/xGSN using MAP› LTE has MME/HSS/PCRF using Diameter

MME SGSN MSC

LTE GPRS 2G/3G GSM

Subscriber Routing DB (SRDB)DIAMTER MAP MAP

SLF, HLR/HSS Selectors, 2/3G-LTE migration

Add Customer Specific Database

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G‐Flex

Core DB Evolution continues …

› Phase_3 Phase_4

Wireless2G, 3G

VOIP

HLRHLR HSSHSS

SLF   

Signaling

Core

Customer

DBG‐Flex

Wireless2G, 3G

LTEIMS

HLRHLR HSSHSS

SLF   

Signaling

Core

Customer

DB3G/LTEMigration

3G/LTEMigration

ENUMNP

LTEIMS

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Diameter Relay Point - DRP

› DRP acts as a Diameter Proxy Agent and forwards Query and Response messages to the respective destination based on the Destination HOST, Realm and Application Id. It also performs HOST name to IP address resolution using external DNS queries

› The DRP plays a critical role in the IMS network by offering several advantages:

Reduces the number of SCTP associations required in the network. This will help simplify the overall complexity in the networkAll the network elements shall just route to DRP for any messages destined to HSS. DRP offers load-sharing, faster failure detection and recovery and efficient routing of messagesMerging the SLF and DRP functions in a single node reduced latency of HSS queries. It also reduces the number of messages required to perform a HSS queryDRP can be used to perform HSS selection as well as Diameter Mediation at a later phase

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DRP (Diameter Proxy)

DIAMETER

Subscriber Routing Database

S-CSCF

PCRF

CCF,

CDF, OCS

I-CSCF

ASMFRCMME

DiameterSCTP or TCP

DiameterSCTP or TCP

DiameterSCTP or TCP

DiameterSCTP or TCP

DiameterSCTP or TCP

DiameterSCTP or TCP

DiameterSCTP or TCP

DiameterSCTP or TCP

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Converged Database for Multiple Applications

NP Ref Data

ENUM Registry

Network Routing

Data

SS7 Access IP Access

3G

Common Subscriber

Routing Database

HLR Router SLF DRP

Router3G/LTE

MigrationLNP/

ENUM

LTE+IMS

Customer Provisioning

System

IN / AIN / INAP / SRI/ ATI / ISUP

SIP, ENUM, LDAP, DIAMETER, SOAP/XML

Customer Service

IP Access

https, LDAP, SOAP/XML

› Interfaces with multiple data sources for subscriber and network data – NP, ENUM, SMS, Vmail, Prepaid...

› Network access through multiple protocols

› Reduced OPEX/CAPEX due to shared DB, provisioning and network access

› Improved capacity and performance

› Simplified provisioning and operations

Subscriber Routing Database

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Summary: Role of Core Routing DB

HLR Router

LNP

D - Proxy SLF ENUM

LDAP MGR

SS7

DIAMETER DNS

LDAP

Subscriber Routing Database

MSC

Core Realtime DB

Service Portability App

S-CSCFPCRF

CCF,

CDF, OCSI-CSCF

ASMFRC MME

App1 App2

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Thank you !!Thank you !!

Devesh AgarwalRVP, Presales, AmericasPhone: +1 919 641 6919 E-mail: devesh.agarwal@tekelec.com