IMS/ VoLTE and Getting Ready for NFV

1© COPYRIGHT 2016 DIALOGIC CORPORATION. ALL RIGHTS RESERVED.

April 14th, 2016Erik Pras

IMS/VoLTE and getting ready for NFV


4G Architecture


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


Evolved Packet System


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


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


Diameter Signaling Controllers

• Centralized routing• Pivotal role in enabling LTE and

IMS networks


VoLTE and IMS


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


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


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


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

13© COPYRIGHT 2016 DIALOGIC CORPORATION. ALL RIGHTS RESERVED. 13

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


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.


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


IMS and NFV


NFV Benefits


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 AS

VNFSEE VNF

MRF

VNFcCSCF

VNFcEC/CDRVNFc

EC/CDR

VNFcDiameterVNFc

Diameter

VNFcHSS

VNFcLB

VNFcSIP/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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Thank You

IMS/ VoLTE and Getting Ready for NFV

Technology

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