Acme Packet Acme Packet Acme Packet Page 2
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
Acme Packet Acme Packet
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
Acme Packet Acme Packet
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
Acme Packet Acme Packet
Data centers
Core transport
Access
EPC
eUTRAN eUTRAN
Subscriber
authentication
Admission control,
QoS, charging
Diameter-based subscriber profile
exchange is IMS and LTE
Acme Packet Acme Packet
Home
service provider
Visited
service provider Interoperability
Security
Scalability
Network
complexity
& cost
Diameter signaling challenges
Acme Packet Acme Packet
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
Acme Packet Acme Packet 8
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
Acme Packet Acme Packet
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
Acme Packet Acme Packet
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
Acme Packet Acme Packet
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
Acme Packet Acme Packet
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
Acme Packet Acme Packet 13
• 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