LTE roaming – a whole new world
Acme Packet at a glance
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Session Border Control (SBC) category creator
and leader with over 60% market share
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Mission: enable delivery of trusted, first-class
interactive communications and data services
across IP network borders
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10,000+ systems in over 100+ countries
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850+ service provider customers
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240+ enterprise & contact center customers
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100+ distribution & integration partners
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Experienced, long-standing leadership team
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Public company with strong financials
Acme Packet
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Founded: 2000
HQ: Bedford, MA USA
NASDAQ: APKT
2010 revenue: $231.2M
2010 net income: $43M
575+ employees
AT&T
3
The all IP Future
Internet
IMS
Other IP
networks
SS7
over
TDM
SS7 over IP
(BICC/
SIGTRAN)
Diameter
& SIP
over IP
PCRF
EPC
EPS
Core
PSTN
NGN
IMS
RAN
2G
3G
LTE
20012010
2011-
P-GW
S-GW
4G
LTE/M-WiMAX
eUTRAN
MME
19902000
eUTRAN
All services
IMS/SIP services
Data services
Diameter
Mobility tracking
Acme Packet
LTE roaming overview
1. Attachment procedure
2. Authentication procedure
3. Update location procedure
4. Subscriber data retrieval procedure
5. Policy exchange
Roaming border
Visited network
MME
1
Attach
2
Authenticate
Home network
PCRF
PCRF
2
Authenticate
3
Update Location
Subscriber Data
Policy exchange
Acme Packet
5
HSS
4
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
Visited MNO
MME
Home MNO
HSS
• S9 Diameter interface (TS 23.203)
– Policy interface between the Home PCRF and Visited PCRF
– Transfers QoS policy and charging control information
Visited MNO
PCRF
Acme Packet
Home MNO
PCRF
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 Routed
Distributed
Policy Control
Visited
P-CSCF
Visited
Services
Home
network
PCRF
H-PCRF
PCRF
PCRF
V-PCRF
Visited
network
eUTRAN
eUTRAN
eUTRAN
eUTRAN
Acme Packet
7
LTE roaming is all IP
3G
LTE
Switching
Circuit
Packet
Voice bearer
TDM voice
Packet voice
Roaming signaling SS7
(policy exchange)
Diameter
Subscriber data
HLR
HSS
QoS element
n/a
PCRF
Acme Packet
Roaming challenges
Service provider A
Service provider B
Interoperability
Security risk
Scalability
Network
complexity
& cost
Acme Packet
Roaming network requirements
• DoS protection
• Comprehensive L3-L5 interworking
• Intelligent routing
• Accounting/recording
Acme Packet