Wanderlust:

Enabling roaming in the LTE era

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All services

IMS/SIP services

Data services

Diameter

Mobility tracking

4G LTE/M-WiMAX

eUTRAN

EPC

eNodeB

PCRF

S-GW

MME

Internet Other IP networks

P-GW

IMS

LTE

EPS

RAN

Core

2001-

2010

NGN

3G

SS7 over IP

(BICC/

SIGTRAN)

2011-

Diameter

& SIP

over IP

IMS

LTE

1990-

2000

SS7

over

TDM

PSTN

2G

The future is all IP

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3G LTE

Switching Circuit Packet

Voice bearer TDM voice Packet voice

Roaming

signaling (policy

exchange)

MAP/CAP Diameter

Subscriber data HLR HSS

Session Signaling SS7/ISUP SIP

QoS element n/a PCRF

Roaming architecture changes

with LTE

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1. Attachment procedure

2. Authentication procedure

3. Update location procedure

4. Subscriber data retrieval procedure

5. QoS policy exchange

Home network

1 Attach

2 Authenticate 2

3

Visited network

HSS MME

Roaming border

Authenticate

Update Location

4 Subscriber Data

5 Policy exchange

PCRF PCRF

LTE roaming overview

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Data centers

Core transport

Access

EPC

eUTRAN eUTRAN

Subscriber

authentication

Admission control,

QoS, charging

Diameter-based subscriber profile

exchange is IMS and LTE

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Home

service provider

Visited

service provider Interoperability

Security

Scalability

Network

complexity

& cost

Diameter signaling challenges

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New product emerges:

Diameter signaling controllers • Addresses all Diameter signaling

interfaces and applications

• Authentication

• Location/mobility

• QoS

• Charging

• LTE data & VoLTE roaming

• Provides critical signaling controls that reduce costs, accelerate time to market and assure availability

• Security

• Traffic control

• Interoperability & mediation

• Routing & aggregation

• Reporting & analysis

7

Standards compliant

• RFC 3588 Diameter agent

• 3GPP Diameter Routing Agent (DRA)

• GSMA Diameter Edge Agent (DEA)

Servers Clients

Reque

st

Request

Agents

Security Mediation

Congestion

control

Monitoring

& reporting Response

Load

balancing

Routing

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DSCs support broad

set of applications

• Voice roaming

• Data roaming

• Services federation Edge

• Aggregation & routing

• OCS proxy

• HSS/AAA proxy

• PCRF proxy

Core

IPX

MNO MNO

OTT/

Web

Service provider

HSS, OCS, PCRF

nodes

MME, PDN GW,

GGSN, CSCF, AS

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Diameter signaling controllers –

key benefits

• Expedites time to market – Real-time resolution of Diameter interoperability

– Provides visibility for planning and troubleshooting

– Select and interoperate best of breed products

– Simplifies scaling

• Secures roaming borders – Diameter signaling rate limiting

– Hides topology from roaming partners

– Confidentiality of roaming information

• Enables new business model: Over the top services with QoE – QoS and transport controls over broadband network

– New revenue stream

• Enables wholesale hubbing of LTE roaming services – IPX carriers provide multilateral roaming interconnection

– Complement SIP and SIP-I interconnects

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Operator session delivery will be IMS

GSMA Leads Mobile

Industry Towards a

Single Global Solution

for Voice over LTE

“…a single, IMS-based voice

solution for next-generation

Mobile Broadband networks”

February

2010

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Home network

Visited

network

Home Routed

PCRF H-PCRF

V-PCRF

Distributed Policy Control

PCRF

Visited Services

• Home routed with data backhaul to home network (existing data model)

• Distributed policy control with policy interfaces

• Visited P-CSCF with policy control in visited network (selected by GSMA IR.92)

• Visited services with IMS core in visited network

VoLTE roaming options

V-PCRF

Visited P-CSCF

H-PCRF

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LTE roaming solution must encompass

all services & entire ecosystem

12

SIP & Diameter MNOs & IPX Voice & data

Visited P-CSCF DRA I-BCF/TrGW

12

SIP RTP

Data Diameter

LTE

IPX

LTE

Visited Home

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• Diameter is the key IP signaling

roaming protocol

• Diameter signaling controllers

provide security, routing,

interoperability functions

• VoLTE roaming requires

additional SIP controls

Net-Net

IPX/

roaming hub

Service provider

Visited

service

provider

HSS, OCS, PCRF

nodes

MME, PDN GW,

GGSN, CSCF, AS