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Essential Features of Public Network
RequirementsQoS guarantee
High availabilit Equi!ment hot"swa!!able har#ware
$$%$$$& availabilit
'n"line software u!gra#es
Scalabilit
(ase# on global )o!en* stan#ar#sSu!!ort for a new range of a!!lications
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E+,S-,N. NE-/'R0S
PS-N1 -he network consists of 2ocal e3change4RS5 as a !art of
6ccess Network an# -6+s as a !art of core Network%6lrea# huge amount of mone has been investe# in PS-N
setu!
76PE+ )7a!ital E3!en#iture* an# 'PE+ )'!erational
E3!en#iture*
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P28N )Public 2an# 8obile Network*
P28N has been #evelo!e# to !rovi#e voice
services for wireless subscribers% -hough in
recent times man a!!lications hasemerge# as killer a!!lication for mobile%
P28N inclu#es (-S4(S7 as access
network an# 8S7 as a core Network
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PS9N4PSP9N -his network was basicall #esigne# for accessing remote
files an# servers for #efense !eo!le an# universities but
nowa#as nobo# can think of living without #ata network
services%
-he basic an# most !o!ular a!!lication of #ata networks is
,nternet% 'ther a!!lications inclu#e E"commerce: online
banking: online gaming: E"sho!!ing: ,P-; ;i#eo on#eman# an# man more% 9ata network is an assembl of
routers: which are res!onsible for forwar#ing information
from one en# to other
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9rawbacks -he se!arate network infrastructure an#
no sharing of infrastructure among them%
Sharing through .atewas
'wn service !latforms in other wor#s services are
tightl cou!le# with their networks
Se!arate access trans!ort an# switching network
service !rovi#er has to invest in all the three
networks se!aratel
76PE+)7a!ital E3!en#iture* an# 'PE+
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/h N.N
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N.N ;ision
Ne3t .eneration Network is the framework where o!erator willhave a common trans!ort network base# on ,nternet Protocol for
!rovi#ing all kin#s of telecommunication services%
Hence o!erators will have to install an# maintain onl a singlenetwork: which will re#uce its 76PE+ an# 'PE+ significantl%
8oreover service !rovisioning will become easierbecause of the
intro#uction of new an# intelligent servers%
N.N is able to!rovi#e ;en#or in#e!en#encebecause of the
stan#ar# !rotocols it uses for interaction with network elements%
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N.N 9efinition
,-5"- #efinition for N.N1
6 Ne3t .eneration Network )N.N* is a !acket"base# network able to !rovi#e services inclu#ing-elecommunication Services an# able to make useof multi!le broa#ban#: QoS"enable# trans!ort
technologies an# in which service"relate#functions are in#e!en#ent from un#erlingtrans!ort"relate# technologies%
,t offers unrestricte# access b users to #ifferent
service !rovi#ers%,t su!!orts generali=e# mobilit which will allow
consistent an# ubiquitous !rovision of services tousers
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N.N ,-5 Pers!ective
Ne3t .eneration Network )N.N* !rovi#es a frameworkfor network evolution: as #efine# b the ,-5"- )Rec%>%?@@A*
0e 7haracteristics
Packet"base# network Bgenerall ,nternet Protocol or ,PC ,n#e!en#ence of service"relate# functions from un#erling
trans!ort technologies
,nterworking with legac networks via o!en interfaces
.enerali=e# mobilit5nrestricte# access b users to #ifferent services an#4or
service !rovi#ers
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E-S, )Euro!ean -elecommunication
Stan#ar#isation ,nstitute* #efines the N.N as a
conce!t for #efining an# #e!loing networks: which#ue to their formal se!aration into different layers
and planes and use of open interfaces, offers
service providers and o!erators a !latform: whichcan evolve in a ste!"b"ste! manner to create:
#e!lo an# manage innovative services%
NGN Definition (ETSI)NGN Definition (ETSI)
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Fun#amental 6s!ects N.NFun#amental 6s!ects N.N Packet"base# transferPacket"base# transfer
Se!aration of control functions among bearer ca!abilities: call4session: an#Se!aration of control functions among bearer ca!abilities: call4session: an#
a!!lication4servicea!!lication4service
9ecou!ling of service !rovision from trans!ort: an# !rovision of o!en interfaces9ecou!ling of service !rovision from trans!ort: an# !rovision of o!en interfaces
Su!!ort for a wi#e range of services: a!!lications an# mechanisms base# on serviceSu!!ort for a wi#e range of services: a!!lications an# mechanisms base# on service
buil#ing blocks )inclu#ing real time4streaming4non"real time services an# multime#ia*buil#ing blocks )inclu#ing real time4streaming4non"real time services an# multime#ia*
(roa#ban# ca!abilities with en#"to"en# QoS an# trans!arenc(roa#ban# ca!abilities with en#"to"en# QoS an# trans!arenc
,nterworking with legac networks via o!en interfaces,nterworking with legac networks via o!en interfaces
.eneralise# mobilit.eneralise# mobilit
5nfettere# access b users to #ifferent service !rovi#ers5nfettere# access b users to #ifferent service !rovi#ers
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N.N 6rchitecture
N.N 7once!t 6 unifie# !acket trans!ort laer for all t!es of services
6 session base# control architecture For user to user voice : vi#eo an# #ata services over the !acket infrastructure
6 common Service #eliver !latform
E3!ectations from N.N
.enerate new revenue streams b having fast roll out of newmultime#ia services
Secure voice revenue stream b integrating PS-N
infrastructure with N.NProvi#e solution to cater to PS-N obsolescence wherever
a!!licable
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Requirements for N.N ,m!lementation
Equi!ment an# Network ,ntero!erabilit between various'!erators 6 stan#ar#s base# functional architecture
Stan#ar# interfaces an# !rotocols
6bilit to serve Fi3e# )7o!!er an# fibre*: /ireless an# 8obile
Networks '!en Services 6rchitecture
Stan#ar# interfaces o!en to thir# !art a!!lication service!rovi#ers
QoS 7ontrol 8echanism ,m!ortant for voice an# vi#eo services
Requires ban#wi#th allocation mechanism at access level as it isshare# between various services
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Requirements for N.N ,m!lementation
Nee# to share management functions like!rovisioning: metering: billing: QoS monitoring
Provi#e .enerali=e# 8obilit features
8obilit features at the fi3e# access: noma#ismProvi#e service continuit between fi3e# an# mobile
access lea#ing to convergence
7ommon technolog for trans!ort laer
,P48P2S has emerge# as the most suitable
technolog for this laer
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N.N 7once!t
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N.N 7once!t
PS-
N
P28
N
PSP
9N
Service 4 6!!lication 2aer
7ontrol 2aer
-rans!ort 2aer
6ccess 2aer
Each vertical on the left has to be s!lit into Network
Elements that ma! onto each hori=ontal on the right
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NGN Architecture
NGN is a layered architecture consisting of transport, access, control and application
layer. It is important to note that all the layers are independent from each other.Change in one layer should not affect other layers
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Interfaces
Switching
Call ControlCall Server /
Soft Switch
Routers ofI/!"S
Networ#
Gateways
S$N
SwitchNGN Components
S$N to NGN !apping
$%!
$ransport
Networ#Common IP MPLS Transport
S. 4 -8. 4 26.
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Service X Service Y
Separated control
NB Wireless
BB Wireless
BB Wireline
IP/MPLS Transport Core
Management
Service 2aer
7ontrol 2aer
6ccess 2aer
Open interfaces
S,P
H%?D QoS 8echanism
F87
5sage 8easurement
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N.N 7once!t
Service 4 6!!lication 2aer
6!!lication 2aer
-rans!ort 2aer
6ccess 2aer
N.N
PS-NP28N
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6ccess 2aer 6ccess 2aers is res!onsible for #irect subscriber
attachment function%
N.N can su!!ort all kin# of e3isting access as well
as u!coming access an# is ca!able of !rocessing
traffic originate# from PS-N: .S8: 7986: 39S2:/i86+ or an other access sstem%
9e!en#ing u!on the t!e of access: !rotocol
conversion an#4or me#ia conversion ma berequire# at theN.N .atewas
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N.N .atewas
Media Gateway:Access gatewaySignaling gateway.
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8e#ia .atewa -erminates me#ia: coming from PS-N4P28N in EA 4 S-8% Here it
is res!onsible for !acketisation of me#ia un#er the instruction of
control laer
su!!orts !acketi=e# voice an# the interface to whatever me#ium the
voice is to be trans!orte# on%
-he 8. !erforms the task of !acketi=ing voice an# !rovi#ing
connections from switche# circuits )-98* to !acketi=e# circuits ),P:
Frame Rela: or 6-8*%
,t is res!onsible for me#ia conversion: resource allocation an#
resource management: an# event notifications%
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8e#ia .atewa
,t is res!onsible for re!orting events to the media gateway controller)8.7* within its =one%
(etween 8e#ia .atewas )8.s* an# 8e#ia .atewa 7ontrollers
)8.7s* the !rotocol use# is !egaco/&.'()%
R-P !rotocol is use# between two 8.s for !acketi=e# bearer traffic%
-he !ur!ose of this !rotocol is to !rovi#e communications for callcontrol an# call signaling%
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8e#ia gatewa
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Functions of 8e#ia .atewa1
!edia Conversion*conversion from -98 circuit"switche#connections to 6-8: ,P: or Frame Rela connections
Resource Allocation* Resource allocation inclu#es the reservationan# release of all resources : un#er the #irection of the 8.7
+vent Notification* maintain the state of all resources an# re!ort thestate to the 8.7%
,f a !articular resource fails: the 8. re!orts the failure to the 8.7%
-he 8.7 maintains a state table for all resources within the 8.s in
its =one%
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Signaling gatewa
,t is a bri#ge to the PS-N ,t converts between SS a##resses )!oint co#es*
an# ,P a##resses
SIG$RANarchitecture is use# between Sig .ate/a an# 8e#ia .atewa 7ontroller%
$ransport "ayer
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$ransport "ayer
-rans!ort 2aer of N.N is base# on ,P%
-rans!ort 2aer forms the core of the Network%
,t basicall consists of Routers: which are res!onsible for carring
traffic originate# b access laer%
it shoul# be able to make use of ban#wi#th !olicies an# QoS !olicies%
'!erator has to think of manage# Network for its subscribers%
,t is basicall an assembl of routers connecte# with o!tical network%
-raffic coming from gatewas is !ro!erl route# b those routers
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$he NGN architecture
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Softswitch !edia gateway controller-* -he 8.7 is res!onsible for controlling all the 8.s within its
=one%
!erforms a number of call control functions that are t!icall
foun# in the call control !ortion of a legac switch%
-his inclu#es #etermining an# controlling signals use# on s!ecific
circuits: such as ringing an# bus tones%
-he 8.7 also #etermines the QoS require# for an one
connection at the 8.%
,n short: the call han#ling is !erforme# at the 8.7: rather than at
the 8. itself%
-his enables carriers to #e!lo less e3!ensive equi!ment at the
e#ge of their networks
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S$N versus NGN*
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PS-N v4s N.N PS-N
Pro!rietar interface:
switch G call control
9istribute# call
control) 8ain E3gs* 9e#icate# N4/ for
voice
E3cellent voice qualit
;en#or #e!en#ent
N.N
Stan#ar# !rotocol
7entral call control
Packets
.oo# voice qualit
'!en source !latform
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,m!lementing N.N in (SN2,m!lementing N.N in (SN2
S-EP" ,1 ,P -6+ is the re!lacement of
e3isting 2evel ,42evel",, -6+ e3changes S-EP ,, 1 ,m!lemention at the local e3change
level%
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8igration involves
Re!lacement of -98 network elements in a !hase# manner 8a3imum reuse of e3isting resources
5se of o!en an# mature stan#ar#s
7onvergence of access an# backbone network 7ontinuation of e3isting network ca!abilities an# services
with same or com!arable QoS an# securit
,nterworking between #ifferent t!es of networks
6##ition of new services
Phase ,1 8igration of -6+*
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Phase ,1 8igration of -6+* ,n first !hase of im!lementation o!erators can re!lace their transit
network with soft"switch architecture%
'!erators can make use of the Soft"Switch architecture for theNational 2ong 9istance calls
Present Network Setu!
Phase ,1 8igration of -6+*
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2ocal E3changes have to be connecte# to Signaling .atewa for signaling
trans!ort%
Signaling .atewa converts 77S messages to com!atible S,.-R6N messages
an# sen#s it towar#s 8e#ia .atewa 7ontroller or Soft"Switch
8.7 instruct concerne# originating an# terminating me#ia gatewas to !re!are connection
/hen all the con#ition for the call is met: 8.7 instruct concerne# originating an#
terminating me#ia gatewas for finall maturing the two communications%
(oth the 8.s convert receive# -98 voice to !ackets using Real -ime Protocol an# vice
versa%
6ll the communication between 8.7 an# 8. is in H%?D !rotocol%
-he #isconnection of the call is informe# b the concerne# S. to 8.74SS an# then 8.74SS
instructs both the 8.s to #isconnect the R-P link
Phase ,1 8igration of -6+*
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S ft S it hi - it 6 hit t
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Soft switch
"ocal / $andem
+change
(earer
(earer
Soft Switching -ransit 6rchitecture
Signaling Signaling
$!G
SGSG
$!G
Common IP MPLS Transport
S-P
"ocal / $andem
+change
S-P
Signaling
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7all Processing
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hase II* !igration of "ocal +changes ,n this !hase 2ocal E3changes )2Es* are re!lace# b the Soft"switch
an# 6ccess .atewas )6./* with same services%
Soft"switch with local features will be use# as a common control
element for class I a!!lications%
6ccess .atewas )6.* !rovi#es various t!es of access to the
subscribers )e%g% PS-N: ,S9N: ;I%?: 39S2 etc%* an# connects them to,P core network%
6.s ma be configure# for various class I a!!lications #e!en#ing on
en# user to!olog: #ensit: service requirements: etc%
9e!en#ing u!on the si=e of the network: a single soft"switch with
class D an# class I a!!lications ma be !lanne#
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hase II* !igration of "ocal +changes
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!igration from S$N to NGN
Necessity
Network convergence single network for
voice: #ata an# vi#eo
'PE+ an# 76PE+ savings
New service o!!ortunities
8igration of Services
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8igration of Services
6ll PS-N services with same equi!ment: same look an# feel shoul# be !rovi#e#%
,N an# value"a##e# services ma be im!lemente# using 6!!lication Servers )6S*:
which will be accesse# b soft"switch via Session ,nitiation Protocol )S,P*%
Full 7onverge# 6rchitecture
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,8S 6rchitecture
Full 7onverge# 6rchitecture