ims/ volte and getting ready for nfv
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April 14th, 2016Erik Pras
IMS/VoLTE and getting ready for NFV
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4G Architecture
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LTE Architecture
3GPP Evolved Packet System Mobile IP packet network
› High bandwidth› Low latency
Consists of› EUTRAN or LTE Radio Network› Evolved Packet Core (EPC)› IP service domains
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Evolved Packet System
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Evolved Packet Core
Multi-access core network based on IPEvolution of the legacy GPRS architecture› Provides connectivity to:
3GPP access (LTE, UMTS, GPRS) Non-3GPP, trusted and untrusted (WiFi, Wimax)
Connectivity to IP service domains IMS Internet
Supports authentication, QoS, security, policy and mobility management
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Diameter signaling in the EPC
Four Main Network Elements in the EPC› MME› PGW› SGW› HSS
Many other elements Signaling based on Diameter Operators typically deploy with a Diameter Signaling Controller (DSC) as a central router The DSC is a logical place for many signaling based services
› Steering of roaming› Integration with IT based subscriber databases
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Diameter Signaling Controllers
• Centralized routing• Pivotal role in enabling LTE and
IMS networks
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VoLTE and IMS
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What about voice?
4G networks were initially deployed as data only.› End-to-end packet network
Circuit Switched Fallback› Need to retain 2G/3G environment for this
4G only operators need to use roaming to offer voice. VoLTE solves this
› VoIP based service› Integrated in the phone dialer
VoLTE is implemented using IMS› Quite a few networks have started using VoLTE
VoLTE roaming is still in it’s infancy› IPX providers will play an important role
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IP Multimedia Subsystem Specified by 3GPP since release 5 Architecture for offering services in the IP domain, service enabler Quality of Service support Standardized application interfaces User authentication, authorization and accounting Horizontal architecture, defining a dock for applications Common application domain for VoLTE, RCS Access agnostic
IMS
10
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Voice Over LTE is Key Driver for IMS Networks
VoLTE is the first large scale application of IMS End User VoLTE Value Proposition
› HD Voice Higher MOS: ~3.8 vs. ~3.4 Skype
› Faster Connect 2.9 sec vs. 5 sec for 3G
› Longer Battery Life 56-94% longer than Skype
› Simultaneous voice and data usage Network Operator VoLTE Value Proposition
› Enables Network Consolidation› All-IP platform for competing with OTT’s
“118 operators in 56 countries are investing in VoLTE deployments, studies or trials, including 48 operators that have commercially launched HD voice service using VoLTE in 29 countries” – Global Mobile Suppliers Q1-2016
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IMS-VoLTE Core Network Elements
UE
P-CSCF I-CSCF S-CSCF
HSS/SLFPCRF
BGCF
VoLTE AS
MRFC
MRFP
IMS Call Session Control
IMS-to-PSTN Interconnect
MGCF SGW
MGW
PSTN
IMS
IMS-to-IMS Interconnect
I-BCF
UETrGW
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IMS Benefits
Shared Resources• Media server resources • Common user data • Single user profile across applications• Integrated applications
Session Control• Common Session Control (SIP)• Provides common service policies• Leverages investments across multiple applications
Access Network Agnostic• Eliminates multiple service solutions• Network transparency• Consistent services across networks
Converged Applications• Across Networks• Reduced development costs and time• Voice, Video and data services• Write once / use many
Transport
Control
Applications
DSL Mobile PSTN
VoiceVideo
HostedServices
Web ContentMP3
Win Media
Text
Data
SIP
Access
CMTS
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IP Multimedia Subsystem (IMS) Enables Convergence
PSTN
IP Transport
PLMNIP
Session Control
IN Services MMTelTAS/VAS
IMS Provides a Unified Services Architecture for All Access Networks› Single Services Layer, Single Session Control Layer, Common IP Transport Layer for all access networks
Key Characteristics› Access Convergence › Services Convergence
› Open architecture› Vendor independent
PSTN IP
PLM
N
Aol.
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SIP application servers
Accepts request and responses The S-CSCF selects configured AS’s via the SIP based ISC interface Interacts with other elements like the MRF Typically communicates with the HSS to obtain user related information VolTE uses an IR.92/IR.94 compliant TAS for basic telephony services
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IMS and NFV
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NFV Benefits
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London Data Center
Hong Kong Data Center
The Benefits of Decomposition and Virtualization
VNFcPCRF
VNFcLB
EM VNFcSIP/ICEVNFc
SIP/ICEVNFcSIP/ICEVNFc
SIP/ICE
VNFcSIP/ICEVNFc
SIP/ICEVNFcSIP/ICEVNFc
SIP AS
VNFSEE VNF
MRF
VNFcCSCF
VNFcEC/CDRVNFc
EC/CDR
VNFcDiameterVNFc
Diameter
VNFcHSS
VNFcLB
VNFcSIP/ICEVNFc
SIP/ICEVNFcSIP/ICEVNFc
CSCFVNFSEE VNF
MRF
VNFcSIP AS
VNFcEC/CDRVNFc
OCS
VNFcDiameterVNFc
Diameter
VNFcOCS
Component SIP interface VNFs scaled in reaction to increase in traffic
EM
VNF Mgmt.
Non real-time CDR VNF resources moved to alternate data center to enable scaling out of additional SIP processing capacity
Additional SIP VNFc added to handle traffic spike
NFV Orchestrator
VIM Management
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