1. Ready for the
Evolution: LTE
Session delivery
requirements
Juan Luis Esteban Vice President,
Solutions Architecture EMEA
01/06/12 Acme Packet | www.acmepacket.com 1

2. Cost effective scaling solutions required
to deal with growing signaling demands
 All-IP networks are
LTE & IMS
built differently 2G/3G & PSTN SIP
VoIP
 SIP to establish RCS
VoLTE
communication sessions SS7
Hosted UC
 Diameter to manage Diameter
Authentication
subscriber mobility and profile QoS
Charging
data
Mobility
 Exploding signaling traffic
 Moving beyond voice - UC,
RCS messaging, collaboration
 Extreme mobile data usage
 Mobile device proliferation –
smartphones, tablets, M2M
 Increased mobility and
roaming

3. Diameter Applications in LTE & IMS
Attachment/registration Mobility/tracking
Authentication & authorization Authentication & authorization
Data and voice sessions Roaming
QoS & charging
AAA, charging & QoS
3

4. Diameter Interfaces in LTE and IMS
IMS Sh
Ro Cx Diameter Pain Points
Rf e2  Scalability and
Complexity
Rx
EPC S9  Interoperability
Gy/
Gz Other Challenges
Gx S6a service
 Overload and
Gx providers
Congestion
S6a
 Security
S6d
4

5. Outages are costly –
to top line and to brand
5

6. Introducing
Diameter Signaling Controllers
 Addresses all Diameter Service provider
signaling interfaces and HSS, OCS, PCRF
applications
IPX/
nodes
roaming
hub
• AAA
• QoS
MME, PDN GW, Visited
• Charging GGSN, CSCF, AS service
provider
 Provides critical controls
• Security
Standards compliant
• Overload control
• RFC 3588 Diameter agent
• Interoperability
• 3GPP Diameter Routing Agent (DRA)
• Routing & aggregation
• GSMA Diameter Edge Agent (DEA)
• Reporting & analysis
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7. Diameter Signaling Controllers are
different from STPs
 Diameter lacks congestion management and
resource allocation provided by SS7
– Similar to the ISUP to SIP paradigm shift
– Same challenges in Signaling Control for Diameter
and SIP
– Routing logic MUST be based on flexible criteria
 Security for Diameter signaling is key
– Hardware based encryption and Access Control
– DoS protection
– rate limiting and Overload Control
 Diameter Signaling Adaptations will be required
– Diameter AVP manipulations to normalize vendor
implementations
– IP and transport layer interworking
Diameter is an IP Signaling Protocol
7
Acme Packet confidential

8. Two Types of DSCs:
Core and Interconnect
• Voice roaming
• Data roaming IPX
Interconnect • Services MNO MNO
federation
IMS
• Aggregation &
routing
Core • OCS proxy EPC
• HSS/AAA proxy
• PCRF proxy 3G/LTE
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9. Core Diameter Routing Solution
 Core DSCs address all Diameter interfaces
 Online charging (OCS) – Gy, Rf, Ro
 QoS / policy (PCRF) – Gx, Rx
 Subscriber profile/AAA (HSS) – S6a, S6b, Servers
S6d, Swm
 DRA 3GPP function
 SLF 3GPP functions
 Connection aggregation, routing &
load balancing
 Overload control
Clients
 Comprehensive L3-L5 interworking
 Reporting and analysis
 Benefits
 Streamlined and scalable network
 Improved network resiliency
 Lower total cost of ownership
 Faster time to market
 Enhanced visibility and manageability
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10. VoLTE and Data Roaming Solution
 Comprehensive SIP and Diameter control across roaming ecosystem
 I-DSC – DRA and GSMA DEA functions: S6a & S9 interfaces
 A-SBC – V-P-CSCF
 I-SBC – I-BCF/TrGW and IPX Proxy
 Net-SAFE protects Diameter and SIP borders – service availability
 Maximize service reach – end-to-end interworking
 Cost effective scalability – lower TCO
Visited Home
IPX
LTE SIP Data LTE
RTP Diameter
10

11. Do you really have to do this???

12. IMS architecture Web site architecture
DB
DB
AS AS AS
WS WS WS WS
LB-L
LB-G

13. IMS cloud architecture Web site architecture
DB DB
DB DB
AS AS AS AS AS
DSC SMX SMX SMX WS WS WS WS
SLB-L LB-L
SLB-G LB-G
EPC IC

14. Net-Net SIP Multimedia-Xpress
simplifying IMS
 Integrated session delivery
platform
 Provides IMS access, call
session control, routing and
interconnect functions in
single platform
versus
 Eliminates signaling
complexity
 Lowers total cost of ownership
– CAPEX - fewer systems to
deploy
– OPEX savings - easier to
certify, maintain &
troubleshoot
14

15. Net-Net SMX – comprehensive
VoLTE/RCSe solution
Service & applications data centers
(IMS/NGN)
 Integrated session delivery core based on
Net-Net SBC ENUM/DNS PSTN
 Standard x-CSCF 3GPP IMS interfaces
IMS solution for voice, RCS(-e), FMC
Cx
 IP peer
& multimedia services Rf
ISC
Mg, Mj
– Subscriber populations of thousands to
millions
Ici
e2
– Initial service roll-outs evolving to
large scale subscriber deployments SBC
SBC
 Scaling & evolution Rx Rx/Rq
– Scalable Net-Net SMX – Session-aware Gm Gm
Load Balancers
EPC FTTx
– Purpose built platforms and xDSL
VM on COTS hardware Cable
Enterprise
 Lower total cost of ownership
– CAPEX & OPEX savings - easier to
eUTRAN
certify, maintain & troubleshoot
LTE Fixed Access
Acme Packet Confidential 15

16. Deploying IMS in WEB-like way
Database Server Data center
Layer
PSTN
Application Server
Layer
IP peer
Control
Layer
Load Balancer
Layer
Internet
16

17. Acme Packet solutions
transform mobile network
VoLTE
LTE AT&T Diameter
roaming routing
IMS LTE
RCS-e RCS
Small cells
FMC IPX
SIP
interconnect

18. Additional Resources
• Blog Post: IMS World Forum 2012
Clouds in the IMS Fields
• Blog Post: The Next Generation
Signaling Core for LTE and IMS
• White Paper: Scaling Diameter in
LTE and IMS
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