LTE roaming

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• LTE roaming a whole new world

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Acme Packet at a glance

• 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

ATT
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The all IP Future
Internet
Other IP networks
IMS
PCRF
Core
P-GW
EPC
RAN
S-GW
4GLTE/M-WiMAX
eUTRAN
EPS
MME
eUTRAN
All services IMS/SIP services Data
services Diameter Mobility tracking
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LTE roaming overview

• Attachment procedure
• Authentication procedure
• Update location procedure
• Subscriber data retrieval procedure
• Policy exchange

Roaming border
Home network
Visited network
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Attach
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Authenticate
Authenticate
Update Location
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Policy exchange
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Diameter is the key roaming protocol

• 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

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VoLTE roaming options

• 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

Home network
Visited network
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LTE roaming is all IP
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
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Roaming challenges
Service provider B
Service provider A
Interoperability
Security risk
Scalability
Network complexity cost
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Roaming network requirements

• DoS protection
• Comprehensive L3-L5 interworking
• Intelligent routing
• Accounting/recording

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