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8/6/2019 Voice NGN Case Study
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Voice NGN
2008 Tata Communications Transformation Services, Ltd. All Rights Reserved.
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2Data as on May'08
Agenda
Background
Tata Communications NGN story
Shift towards NGN
ArchitectureChallenges
Approach
Implementation
Benefits
Conclusion
Take Away Slide
Glossary
Annexure
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Background
Evolution of NGN networks
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Background
Evolving towards All IP Communications
Traditional Telecom networks
deployed separate networks
for Data & Voice
NGN: Single network transports
all information & services (voice,
data, video) by encapsulating all
of them into packets
No need for separate voice &
data networks
NGN technology is based on IPand MPLS at the core and SIP at
the application layer
Evolution of NGN networks An Overview
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Background
Evolution of NGN networks:
Market Drivers Increasing demand for new
multimedia services
Increasing demand from businessesfor integrated data, voice and video
Increased competition betweenoperators due to deregulation ofmarkets
Explosion of digital traffic due
to the increasing use of Internet
Business Drivers Capex & Opex optimization
Higher revenue due to higher
addressable market
Ease of extending reach and capillarity
Newer revenue streams and business
models
Network Drivers Cutting edge technology
Network economics
Magnitude of traffic growth Effective network
management Scalability and faster rollout Ease of interconnect Higher network resilience
TheDrivers
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Customer Premises
Core Switching Layer
Service Control Layer
Service Access Layer
Background
SCP (IN)
Class 5
Switch
Class 5
Switch
Class 4Switch
Class 4Switch
DLC DLC DLC DLC
Traditional Voice Networks
End users connect to aClass 5 switch (local
exchange) via a DLC
Switch routes the calleither within itself or to
next level of switch
IN takes care of subscriberaccount validation forprepaid subscribers
Underlying media is on OFC using SDH; and it is a circuit switched network
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Service Access Layer
Service Control Layer
Background
Architecture Evolution
IP/MPLS
Customer Premises
Class 5Switch
Class 5Switch
STP
Application Layer
Class 5
Features
Conference Media Presence
Softswitch
IAD
IP/MPLS
MSANMG
NG-DLC
SBCHSS
CSCF
Set Top BoxCPE IADIP Phone
Normal telephone lines arereplaced with IADs, IP phones,Set-top boxes
These connect to a Softswitch(SS) via either a MediaGateway (MG)/ IAD/ NG-DLC
Softswitch can easily connect toother applications such asPresence, Conferencing etc onIP-MPLS backbone
Underlying media connectivity is on IP MPLS; and it is a packet switched network
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Background
Breaks traditional hierarchy and advocatesflat architecture; much of the intelligence is
pushed out to edge of network
Reduced load on centralswitches
Transport Layer and Control Layer logically andphysically separated
Allows for services to bedeveloped independently fromunderlying connectivity
Open Interfaces based on API
Allows for creation & introductionof services seamlessly and quickly;Speeds up introduction of newservices
Packet switched technologySingle network to carry Voice,Data, Video and other applications
Traditional Architecture to NGN Architecture:
Derived benefitsChanges in Architecture
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Data as on May'08 Tata Communications
Voice NGN network
Shift towards NGN Architecture Challenges Approach Implementation Benefits Conclusion
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Shift towards NGN
Tata Communications
decision to deploy
NGN for its Voice service
Traffic Volumes of the order of500Mn minutes per month
Traffic Volumes increasing atthe rate of approximately
5-11% per month
Increasing number of players in themarket
Need to cut down operational
costs to maximize profits
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NGN Architecture |Overall proposed architecture design
NGN deployment proposed
to be carried out phase-wise
Softswitches planned to be
deployed at the following
locationsLos Angeles
New Jersey
New York
Canada
Hong KongIndia
India NGN taken up as first
phase of implementation
International NGN
deployment in planned stage
This case study focuseson India NGN story
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NGN Architecture
India NGN Architecture
3 Softswitches and 3 SignalingGateways at Mumbai, Delhi and
Chennai
7 media gateways with built
in SG deployed at Mumbai,Delhi, Ahmedabad, Jallandhar,
Hyderabad, Bangalore & Kolkata
NMS system at Mumbai
& Chennai with geographic
redundancy
Vendor deployed is ZTE
Decided based on the currentand forecasted traffic profile& dispersion
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BLR CHN JAL
DEL
MUM
AMD KOL
HYD
STM-1 Links
STM-4 Links
a) Dual Core Routersat all locations
b) Redundant WANConnectivity
between all POPsc) High Speed CORE
Routers C76XXRouters
d) Dedicated Network for Voice
e) All traffic onMPLS-VPN forenhanced Security
f) Core Addressedon Private IPs
NNI
NNI
NNI
Management Link. Dedicated and Redundant X-
Connects for Network Management Only NOC, FMS, NMS and EMSTraffic on the X-Connect No Voice
Traffic
NGN Architecture; Backbone Architecture
MPLS network for Voice NGN
Class of service (COS) implemented for separating signaling traffic from media
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Challenges
Regulatory Partner Design Implementation Operational
VOIP
interconnectguidelines notclearlyformulated
Interconnection
issues Voice Qualityapprehensions
Interface issues
Architectureevaluationchallenges
BSS integrationissues
CNMS Integration
issues Design ofstatisticalreports &customizations
Stringent
timelines POI capacityaugmentation
Networkmigration issues
Integration of
statisticalreports &customizations
Traffic
Engineering PerformanceIssues
KnowledgeTransfer
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Approach
Business Units &
Pre salesNetwork (Plng. & Ops.) Unit
Technology group
TechnologyEvaluation
Proof of Concept NW Architecture
Eqpt Planning BW Planning
Equipment/BW specs
VendorEvaluation
Vendor Order Execution Planning
Market Forces /
Vendor / Competition
NW ProjectsCommercial
Business Case /Project approval& NW economics
Projections
Technology Customized
requirements
Route Planning
Technology
Function
Structured end-to-end approach adopted; new service roll-out process followed
Well-defined workflow & functional interlinkages defined for facilitating smooth roll-out
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Implementation
Vendor Evaluation(Aug 06 March 07)
Installation &Commissioning(April 07 June 07)
Testing & Billingintegration
(July 07- Aug 07)
Equipment logistics
and distribution Equipment installation
8 locations handledparallely
Equipment
commissioning: 8locations handled
parallely Fastest ever NGN
implementation
1
Key Vendor Identification
Sending out RFI Design high level
architecture plan Releasing RFP Evaluation
POC/ Site visit BOM release
Placing equipment order Low level design
High level design
Lab set-up for testing
Tests for variouscapabilities carried out
Test resultsdocumented
Billing Integration
(1) CDR formatcompliance
(2) CDR generationtesting
(3) CDR storagetesting
Equipment Arrival
Key Evaluation Criteria
Architectural Adherence Protocol Adherence Adherence to Standards Interoperability Capabilities
Lawful Interception Operational Features
Billing Compliance Operational Capabilities
Commercials
Some of the
capabilities tested BHCA Support Call Flow, CLI & RoutingFeatures
Protocol Support Lawful Interception
Billing Interoperability
Network RFS
BandwidthProvisioning
( Sept 07)
Bandwidth
pre-provisionedfor smooth migration
of services Issuance ofprovisioning orders
Follow-ups andclosure of the above
Network Migration(Oct 07 onwards )
Hand over toOperations
Communication to
operators
Engg Doc for migrationreleased
Feasibility of portsand bandwidth
Connectivity b/w NGN& TDM switches
Workorder issuance &
program management Configuration & testing
CDR verification Commercial launch of
traffic
2 3 4 5
Concept to implementationexecuted in 15 months
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Benefits
Cost Savings : Overall costs down by around 40 %
Port Savings1. Effective savings in cumulative processing/ BHCA requirement
2. Port utilization improved by 30-35% vis--vis traditional TDM network; corresponding port cost
factor reduced by around 25-30%
Bandwidth Savings1. Less bandwidth required to backhaul traffic on NGN network; approx 70% less bandwidth
required to backhaul traffic on NGN network vis--vis TDM network resulting in corresponding
cost savings2. Converged voice & data network on core optimizes bandwidth by atleast 20%
Network Operations Savings1. Lower number of switching elements2. Reduced operational staff and expenditure
3. Opex cost savings of around 1million USD till date
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Benefits
Network Benefits
Ease of operations1. Lower number of network elements for NMS2. Centralized monitoring
Higher Network resiliency1. Multihoming2. Lower downtimes
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Benefits
Network Benefits
Delhi
MUMBAI
HYDERABAD
CHENNAI
Jalandhar
KolkataAhmedabad
BAN
GALORE
Ambala
LucknowPatna
Guwahati
Bhopal
NagpurRaipur
Cuttack
ERNAKULAM COIMBATORE
Rajkot
Gurgaon
Jaipur
Delhi
MUMBAIHYDERABAD
CHENNAI
Jalandhar
KolkataAhmedabad
BANGALORE
ZTESoft
SwitchZTE
MediaGateway
Ambala
ERNAKULAM COIMBATORE
AlcatelSwitch
Jaipur
Alcatel
Lucent
Marconi
Before After
Network Optimization1. Number of switching elements reduced2. Number of platforms rationalized
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Take Away Slide
In today's expanding competitive landscape, service providers should start looking towards
NGN networks to achieve operational cost benefits and provide service differentiation to
attract and retain customers
TCTS Portfolio of expertise
1. First phase of national NGN deployment completed
2. End-to-end roll-out involving vendor evaluation,deployment,service migration
3. Team possesses requisite skill-sets and expertise of a large scale NGN deployment
4. Further plans to roll-out NGN on an international platform
5. Introduction of additional value-added services on NGN in future
Value Proposition for Carriers
1. Deliver end-to-end or any specific sub-function for NGN deployment
2. Smooth migration of services from existing network to NGN
3. Identify & launch new services on NGN
a. IP Centrexb. Voice VPN
c. Voice over Broadband
d. Multimedia Conferencing
e. Unified Messaging
f. Video on demand
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Glossary
NGN : Next Generation NetworksIP: Internet ProtocolMPLS : Multi Protocol Label switchingSIP : Session Initiation ProtocolPOTS: Plain Old Telephone serviceSDH: Synchronous Digital Hierarchy
OFC: Optical Fibre CableDLC: Digital Loop CarrierRLU: Remote Line UnitWLL: Wireless Local LoopSCP: Secure CopySTP: Signalling Transfer Point
SBC: Session Border ControllerIAD: Integrated Access DeviceMG: Media GatewayMSAN: Multiservice Access NodeSG: Signalling GatewayMGC: Media Gateway ControllerBHCA: Busy Hour Call AttemptsIN: Intelligent NetworksNMS: Network Management SystemVAS: Value Added Services
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2008 Tata Communications Transformation Services, Ltd. All Rights Reserved.
Thank You