wcdma network overview

7/23/2019 WCDMA Network Overview

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WCDMA

Network

Overview This presentation will you some basicknowledge of how our CS Nodes have

evolved.



Contents• Core Network Evolution

o Release Evolution of WC!"

• R## Core Networko $unction Entity of R## Core Network

o

%nterfaces in R## Network• R& Core Network

o $unction Entities

o %nterface and 'rotocol

o R& $eatures

o istributed "rchitecture ( R& Networks

• R) Core Networko R) $eatures

o %' !ultimedia System *%!S+

o S%' *Session %nitiation 'rotocol+



Core Network (CN)

Evolution• CN includes a series of physical entities to reali,e

user location management- network function andservice control- such as */+!SC- 01R- SC'-S!C-/SN etc.

• CN can be divided into three types2 0omeNetwork omain- Transit Network omain and

Transit Network omain



DIVISION OF CORE

NETWORKS



Release Evolution of WCDMA



R99 Core Network• R99 is the original standard for 3!TS WC!" based

networks. 0S'" is an add on to R9943!TS networkswhich adds a shared high speed downlink packetchannel.

• Core Network is split into CS domain and 'S domain. CSdomain is based on original /S! network. 'S domain isbased on original /'RS network.

• CS domain2 used to provide Circuit5switched service.Network mode can support T!- "T! and %'. 'hysical

entities include switching e6uipment *such as !SC471R-/!SCs+- and inter5working e6uipment *%W$+.

• 'S domain2 used to provide 'acket5switched service.Network mode is %'. 'hysical entities include S/SN-//SN- C/ - 8/ etc.



Function Entity of R99 Core Network

•

$unction entity shared by CS domain and 'S 2o 01R2 to reali,e mobile subscriber management

and location information management 9

o 71R2 to deal with all kinds of data information

of current mobile subscriber 9o "3C2 to store authentication information of

mobile subscriber 9

o E%R2 to store %!E% data of mobile subscriber9

o S!S2 Short !essage Center.




•

$unction entity of CS domain2o !SC2 to reali,e switching and signaling control

function of circuit service.

o /!SC2 to reali,e addressing function for

di:erent network.o /!SC and !SC can be integrated together or

separated independently.

o %W$2 integrated together with !SC- to reali,e

inter5working with '1!N and %SN- 'STN - 'N*!ainly complete signaling transfer function+-its functions can be de;ned based on speci;edservices and network types.




•

$unction entity of 'S domain2o S/SN2 to reali,e packet switching function-

signaling control function and route function ofpacket service.

o

//SN2 to reali,e inter5working with 'S domainand e<ternal data network.

o C/2 to reali,e billing function of packet service.

o 8/2 to reali,e inter5working of two /'RS

network and guarantee the security ofnetwork.



Interfaces in R99 Networks

•

Interface between CN and RAN/BSS:

o A Interface2 to reali,e mobile station management-base station management- mobility management andcall processing- etc.

o Gb interface2 to reali,e packet data transmit andmobility management.

o Iu-CS interface2 to reali,e RNS management- mobilitymanagement and call control function.

o Iu-PS interface2 its basic function is similar to %u5CS

interface.




• CS internal interface

o B interface (MSC-VLR2 " private interface between 71R and !SC.%t is used for the !SC to 6uery the current location information of a

!obile Station *!S+ from the 7isit 1ocation Register *71R+- orre6uest the 71R to update the current location information of the !Sor is used for the operations of supplementary services.

o C interface (MSC-!LR2 to get !SRN- the %N service relatedsubscriber status and location information.

o " interface (VLR-!LR2used to e<change the location information

of the !S and the subscriber management information.

o # interface ( between MSC2 to be used for handover process

between two !SCs.o $ interface (MSC-#IR 2 to be used for E%R to verify %!E% status

information of mobile e6uipment.

o G interface (between VLR2 to e<change %!S% and authenticationinformation when !S moves from one 71R to another 71R.




• PS internal interface

o GS interface (SGSN-!LR 2 to e<change mobilelocation information and manage subscriber signedinformation. %t is similar to C interface.

o Gn% G& interface (SGSN-GGSN 2 /T' is adopted-used for establish tunnel and transmit data packetbetween /SN e6uipment.

o Gc interface (GGSN-!LR 2 optional.

o Gf interface (SGSN-#IR

o Gi interface (GGSN ' eternal netw)r*+




• C),,)n interface .ared b CS andPS

o /s interface *!SC471R5S/SN+2 used for combinedlocation update between !SC and S/SN+ .

o 0 interface *01R5"3C+2 used for authentication andciphering. %t is a private interface.



R4 Core Network



Function Entities• !SC Server2 control layer- to reali,e !! *mobility

management+- C! * call control+- !/C *mediagate control+ .

• !/W： bearer layer- to reali,e the e<change ofvoice and media =ow- and provide all kindssources- such as TC- EC- play announcementand receive T!$.

• S/2 to reali,e signaling transfer from !T' *SS>

transmission layer+ to SCT'4%' *S%/TR"Ntransmission layer+.



Interface and Protocol• Mc interface ((GMSC Ser0er'

MG1 2 0.?&@ is adopted- to reali,ethe =e<ible connection processingfor multi call mode- multi media

• Nc interface (MSC Ser0er'

(GMSC Ser0er 2 to reali,e theinter5oAce call control. %t adopts8%CC protocol

• Nb interface ( BetweenMG1： to reali,e the transfer ofcontrol and user information *voice-data- picture- media+ in bearerlayer，and reali,e the transfer ofdi:erent media frame format.RT'43'4%' and ""1?4"T! protocolis adopted.



R4 Features

• 8earer and Control Separated.

• $our 1ayer "rchitecture

• Embedded S/－ Saves transmission link

•

Centrali,ed Service Control• istributed "rchitecture－ $le<ible networking

D b dA h



Distributed Architecture –R4 Networks

• The advantage ofdistributed networking(

o TraAc route is the best-network performance isthe best.

o

!ostly suitable for theoperators with widecoverage.



R5 Core Network



R5 Features•

B/'' R) $eatures2o %nherit all the WC!" R& service and functions.

o %!S * %' !ultimedia System+ is added based on 'S- CS of R) isconsistent with that of R&.

o %u interface can select %' and "T!. %' based is a trend ofnetworking.

o %' oS is enhanced.

o Services are enhanced- such as DS"- 'ush Services

• R) reali,es "11 %' network put forward by B/''.o %' will become the bearing technology for all signaling

message and change the original call =ow.

IPM li diS



IP Multimedia System(IMS)

IPM li diS




• CSC$ : Call Sei)n C)ntr)l $uncti)no %s divided into '4S4% three types based on its function and location.

• '5CSC$*'ro<y CSC$+： %t is the ;rst connection point for subscriber

in %!S and provide 'ro<y function. %t can receive service re6uestand transfer them- but can not modify the Re6uest 3R% ;eld in

%N7%TE message9 '5CSC$ also can provide user agent function *3"+-it can interrupt and independently produce S%' conversion at

abnormal case.

• S5CSC$*Serving CSC$+： S5CSC$ is the core control of %!S- it isresponsible for 3E to register- authenticate and conservation

control- reali,e conservation route function for calling and called%!S user. "ccording to subscriber signed %!S triggered rule- it can

trigger the value added service route to "S and control servicenegotiation.

• %5CSC$*%nterrogating CSC$+2 similar as %!S gateway node- provide

node distribution- route 6uery and %!S Topology 0iding %nter5network function.

IPM lti diS t




• !SS : 2.e !),e Subcriber Ser0er+

o 0SS stores the %!S subscriber signed information- including basicidentity- route information and service signed info. Centrali,eddatabase- located at the top of %!S core network. %t stores the following

information2

• %!S subscriber identity *including public and private identity+-number and address information.

• %!S subscriber security conte<t2 ciphering information for subscriberto access network for authentication- roaming restrict information.

• %!S subscriber route information2 0SS supported route information-registration information and location information.

• %!S subscriber service signed information2 including other "S valueadded service data.

SIP(S i Iititi



SIP (Session InitiationProtocol)

• S%' means Session %nitiation 'rotocol

• %t is application layer control protocol- used to setup- modify- andterminate multimedia session *including meeting+. $or e<ample-internet telephone call.

• Driginally derived from !8one e<periment in ##F.• %n ###- %t was adopted as R$C?)&B standard by %ET$5!!3S%C work

group.

• %n ###- S%' work group was established independently- later- twowork group named as S%''%N/ and S%!'1E was newly set up- whichis mainly devoted to S%'.

• %n the Guly of ?HH?- it is turned to the new standard R$CB?F.

• !ost of the content was re5written. %t is more clear and precise andsome new features were added.

• !ost of contents keep the backward compliance with R$C?)&B.



SIP Features

• 8ased on te<t code.

• Dnly concern about setup- modify and terminatethe conservation. S%'53R1 is used to indicate theresources or subscribers needed to be visited.

• $le<ible e<tended and powerful negotiationmechanism2 Supported- 3nsupported- Re6uire-'ro<yRe6uire- "llow- "ccept.

• Simple networking provides the =e<ibility-

reliability and e<pandability. Relay e6uipment*'ro<y and Redirector+ need not to care about themessage content- Iust transfer transparently.



SIP Stack

wcdma network overview

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