LTE roaming – a whole new world

Acme Packet 3

• Session Border Control (SBC) category creator and leader with over 60% market share

• Mission: enable delivery of trusted, first-class interactive communications and data services across IP network borders

• 10,000+ systems in over 100+ countries

• 850+ service provider customers

• 240+ enterprise & contact center customers

• 100+ distribution & integration partners

• Experienced, long-standing leadership team

• Public company with strong financials

• Founded: 2000• HQ: Bedford, MA USA • NASDAQ: APKT• 2010 revenue: $231.2M• 2010 net income: $43M• 575+ employees

AT&T

Acme Packet at a glance

Acme Packet

All servicesIMS/SIP servicesData servicesDiameterMobility tracking

4GLTE/M-WiMAXeUTRAN

EPC

PCRF

S-GW

MME

Internet Other IP networks

P-GW

IMS

eUTRAN

EPSRAN

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 all IP Future

Acme Packet

1. Attachment procedure

2. Authentication procedure

3. Update location procedure

4. Subscriber data retrieval procedure

5. Policy exchange

Home network

1 Attach

2 Authenticate 2

3

Visited network

HSSMME

Roaming border

Authenticate

Update Location

4Subscriber Data

5Policy exchange

PCRF PCRF

LTE roaming overview

Acme Packet

Visited MNO

MME HSS

Home MNO

Visited MNO

PCRF

Home MNO

PCRF

• S6a Diameter (3GPP TS 23.401)

– AAA interface between visited MME and home HSS

– Transfers subscription, location and authentication data for authenticating user access to visited EPS

• S9 Diameter interface (TS 23.203)

– Policy interface between the Home PCRF and Visited PCRF

– Transfers QoS policy and charging control information

Diameter is the key roaming protocol

Acme Packet7

Homenetwork

Visitednetwork eUTRAN

Home Routed

PCRF

eUTRAN

H-PCRF

V-PCRF

DistributedPolicy Control

eUTRAN

PCRF

VisitedP-CSCF

eUTRAN

PCRF

VisitedServices

• 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

Acme Packet

3G LTE

Switching Circuit Packet

Voice bearer TDM voice Packet voice

Roaming signaling (policy exchange)

SS7 Diameter

Subscriber data HLR HSS

QoS element n/a PCRF

LTE roaming is all IP

Acme Packet

Service provider BService provider A

Interoperability

Security risk

Scalability

Network complexity

& cost

Roaming challenges

Acme Packet

• DoS protection

• Comprehensive L3-L5 interworking

• Intelligent routing

• Accounting/recording

Roaming network requirements