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NGN
Next Generation Network
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AGENDA
What is current generation network
Why Next Generation networks required
What is NGN ?
Architecture of NGN
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What is current generation
network
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CGN
Today al most all telecommunication companiesare maintaining at least three kinds of basic
Network.
1. PSTN: (Public switched Telephone network) Public Switch Telephone Network was basically
developed and engineered for giving voiceconnectivity to the wire line subscribers.
The network consists of Local exchange/RSU as apart of Access Network and TAXs as a part ofcore Network.
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CGN
2.PLMN: (Public Land Mobile Network):
PLMN has been developed to provide voice
services with wireless access.
PLMN includes BTS/BSC as access
network and MSC as a core Network.
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CGN
3. Data Network:
The basic and most popular application of
data networks is Internet . Data network is built up of routers, which
are responsible for forwarding information
from one end to other. Switching Technology implemented is
Packet switching.
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TodaySeparate Service Networks
Separate Access Transport & Switching Networks
INET
otherData
/IPNetworks
PLMN
PSTN/ISDN
Services
Current Scenario
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Current Generation Network(PSTN)
Level-I TAXs at 21 locations (LDCCs)
Level-II TAXs at 301 locations (LDCCs).Total No. of LDCCs - 322
Tandem / Transit Switches at Big Cities / SDCClocations (2325 locations)
Total No. of SDCCs 2647
Evolved over a period of last 100 years.
Optimized for VOICE - call and not for data.
Uses circuit Switching
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Current Generation Network
SDH/DWDM Network
Level-I & II TAX Switches
Local Exchanges, GSM & CDMA
Customers Customers
Level-I & II TAX Switches
Local Exchanges
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MOBILE NETWORK& DATA NETWORK
MOBILE NETWORK
Having MSCs, BSCs, BTSs etc
Packet core network consisting of SGSN and
GGSNConnectivity with the PSTN only at Lev-I TAX
DATA NETWORK
Having NIB nodes at circle/SSA/SDCA level
Connectivity at local exchange level
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NGN Vision
Next Generation Network is the framework where operatorwill have a common transport network based on packetswitching for providing all kinds of telecommunicationservices.
Hence operators will have to install and maintain only asingle network, which will reduce its CAPEX and OPEXsignificantly.
Moreover service provisioning will become easier becauseof the introduction of new and intelligent servers.
NGN is able to provide Vendor independence because ofthe standard protocols it uses for interaction with networkelements.
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Gateways
Internet
Wireless Telephone
System
Integrated
Services
Over IP
Evolving towards IP Communications
Next Generation Networks (NGN)Present Day Networks
Next generation networks
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Each service has its own network Multiplied operational
costs
Each network managed separately
No service interaction
Multiple customer profiles
Seamless service linkage
All services over anyaccess
One network for any service
Unified managementstructure
Single customer profile
Today New Service Networ k
Private Data
Internet Deep Access
Services EdgeMulti-service Aggregation
MPLS Core
OSS OSS OSS OSS OSS OSS
Mobile
NB Voice
WAN
Customer Customer
Migrate
NGN Concept
Video
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MAJOR DRIVING FORCE
BEHIND NGN Individualization of communication
Customization of services
Generalized mobility:
Multiplicity of terminal:
Overlapping of professional & privatedomain
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NGN
NGN refers to the convergence of differenttelecom services.
i.e. voice, data and video over a unifiedpacket network utilising IP.
Packet switching and transport elements are
routers, switches and gateways . In case of BSNL MPLS edge routers and
core-routes constitute the core network.
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FEATURES OF NGN
Packet-based network
Very High-Speed Network from access
to core
Network providing generalized mobility
Unified and Universal Networks
Centralized Control
Open Interfaces
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How NGN is different from CCS 7 network?
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Call Control
Switching
Interfaces
Transit
Call Control
Switching
Interfaces
Call Control
Switching
Interfaces
LocalExchange
LocalExchange
BearerBearer
Circuit Switching (CCS)
Call Control
Switching
Interfaces
Signaling Signaling
STP
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Call Control
Transit
Call Control
Switching
Interfaces
Call Control
Switching
Interfaces
LocalExchange
LocalExchange
BearerBearer
EVOLUTION TO NGN
Signaling SignalingSignaling
Transfer
Bearer
Transfer
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Interfaces
Switching
Call Control Call Server
IP/MPLS
Gateways
Central Office
SwitchNGN Components
NGN Concept w.r.t. Voice Services
SDH
Transport
with Overlay
packets for
data
Common IP MPLS Transport
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NGN Architecture
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Managem
ent
NGN Architecture
Control
Service
Transport
Access
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NGN
Architecture
using Softswitch
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Access Layer
Access Layers is responsible for direct subscriberattachment function.
NGN can support all kind of existing access as
well as upcoming access. In fact NGN does notmatter about type of access.
NGN is capable of processing traffic originatedfrom PSTN, GSM, CDMA, xDSL, WiMAX or
any other access system. Depending upon the type of access, protocol
conversion and/or media conversion may berequired at the NGN Gateways.
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Access Layer
Access Layer consists of Gateways.
Examples of gateways are
Media Gateway, (Trunk media Gatewayand Line media Gateway)
Access gateway and
Signaling gateway.
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Access Layer
Media gateway terminates media, coming
from PSTN/PLMN in E1 / STM.
Here it is responsible for packetisation ofmedia under the instruction of control layer.
After packetisation of information it throws
packets to the transport Network.
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Access Layer
Subscriber can directly be terminated in AccessGateway.
All the required configuration of such subscribersshould be done at control layer.
Access Gateway and Media Gateways areresponsible for carriage of Media
Signaling gateway is carrying signaling generatedby PSTN and informs Control Layer about thesignaling in required format.
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Media Gateway
The MG performs the task of packetizing voice
and providing connections from switched circuits
(TDM) to packetized circuits (IP). The MG is responsible for media conversion,
resource allocation and resource management, and
event notifications.
It is responsible for reporting events to the media
gateway controller(MGC) within its zone.
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Media Gateway
Between Media Gateways (MGs) and
Media Gateway Controllers (MGCs) the
protocol used is Megaco/H.248. RTP/RTCP protocol is used between two
MGs for packetized bearer traffic.
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Transport Layer
Provide the connectivity for allcomponents .
Provide support for the transfer of mediainformation, as well as the transfer ofcontrol and management information.
The backbone network and thetechniques for transport. It is IPbackbone.
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CONTROL LAYER
SOFT SWITCH
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Control Layer
It is responsible of call setup, routing and charging
policies and other controls in NGN environment. It consists of call servers where all information of
the network resides.
These call servers are responsible for setting up,
modifying, charging and tear down of the calls.
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Soft switch
NGN may work on soft switch principle.
It consists of MGC (Media Gateway Controller) as
an overall controller and MGs (Media Gateway)for termination of traffic.
MGC is basically a server and it is having all the
necessary information of network
MGC instructs MGs for establishing the call.
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Soft switch
The MGC also determines the QoS required
for any one connection at the MG .
SIP (Session Initiation Protocol) is used forcommunication between two MGCs and
between a SIP enabled user terminal and
MGC.
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Soft Switch
Performs Call control, signaling and interworking,
Traffic measurement and recording functions
Provides Addressing, Analysis, routing and
charging facilities
Based upon Open Architecture
Should be able to provide all existing services
available in TDM network
Performs Media Gateway Control Function
Interacts with Application Server to supply services
not hosted on Softswitch
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Application Layer
Service Layer/
Management Layer
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Service Layer/ Management Layer
It is responsible for OSS/BSS.
Enhanced services to the subscribers will beprovided with the help of application servers.
It may include prepaid servers, announcementservers, Service servers etc.
Hence NGN is making service separation from
Network. Any service can be introduced with thehelp of server at any time without anymodifications in the control, transport or access
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Application Server
Provides service logic and execution of user
(or customer) services that are not directly
hosted on Softswitch. Due to open architecture and standards it
can be a third party product
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NGN Components
Media Gateway (MG)
Signaling Gateway (SG)
Soft switch or Media Gateway Controller (MGC)
Application/Feature Server
Protocols
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Gateways
1. Interfaces to TDM switches2. Conversion between signalling
(e.g. SS7 to IP signalling)
3. Conversion between media (e.g. E1s to IP)
Signaling GatewayProvides inter working function between
SS7 network and IP networkPerforms Packetisation of signaling andensures its transport through IP network.
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Trunk Media Gateway
TMGW PSTNE1s/STM-1
IP/MPLS
PLMN
MPLS GbE/ 100Base T
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Performs
Voice encoding & Compression
Packetization of voice channels
CNF (Comfort Noise Generation)
VAD (Voice Activity Detection)
Echo Cancellation
May provide the edge functionality
Trunk Media Gateway
AudioCodes
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TP1610
AudioCodes
Media Gateway Offerings
Wireline & Wireless
Up to 480 Ch.
1610
HA System
Wireline & Wireless
18,000 Ch.7,200 Ch.63101610
TP6310
Mediant 8000
Mediant 2000
Large GW
Small and
Very Small GW
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Intels
Signaling Gateway Offerings
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SMON
Media Gateway Offerings
SOFTSWITCH
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SOFTSWITCH
A Softswitch is a device independent software
platform designed to facilitate
telecommunication services in an IP network
Controls the network
Responsible for control and synchronization
of Media Gateways
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Application Server
provides the new services that are the
real value-add for Soft switches
Allows new features to be developed by
third parties.
Softswitch Architecture Interdomain
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Softswitch ArchitectureInterdomain
protocolsApplication
Server
Media
Gateway
SignalingGateway
Media Gateway
Controller
PSTN/
End users
SIP, Parlay, Jain
Sigtran
H.248,MGCP
Application
Server
Media
Gateway
SignalingGateway
Media Gateway
Controller
PSTN/
End users
SIP-T
RTP
Application specific
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MGC MGCSG SG
MGMG PSTNPSTN
SIP
IAM
IAM
INVITE302,CCM
INVITE IAM
IAMACM
ACM180,RINGINGACM
ACMMegaco/
H.248,
MGCP
Megaco/
H.248,
MGCP
ANM
ANM200,O.K.ANM
ANM
ACK
TDM
Audio
RTP
Audio
TDM
Audio
Phone to Phone Call Flow
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QoS Parameters1.Delay (Latency): Time taken to send a packet from
sender to receiver node.
The latency higher than 150 ms noticed and that higher
than 300 ms is unacceptable.
The way to combat latency is to use low-packet intervalcodecs and maintain fast network links.
2. Jitter. It is the variation in latency time from one packet
to the next. It causes packets to arrive out of order.
The solution to this problem is by using a device called
jitter buffers in the SIP phones and MGWs.
3.Packet Loss. Packets discarded during network
congestion causes packet loss.
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Different applications have different QoS requirements
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