- 1. Ericsson Internal | 2012-09-11 | Page 1IMS: ARCHITACTURE
& NODES
2. Ericsson Internal | 2012-09-11 | Page 2Architectural Overview
3. Ericsson Internal | 2012-09-11 | Page 3CSCF Call Session Control
FunctionHSS Home Subscriber ServerEMA Ericsson Multi
ActivationDNS/ENUMMANDATORY NODES IN ICS 5.0 4. Ericsson Internal |
2012-09-11 | Page 4 SLF Subscription Locator Function PGM Presence
and Group Management MRF Media Resource Function SAPC Service Aware
Policy Controller MGW Media Gateway MGC Media Gateway
ControllerOPTIONAL NODES: 5. Ericsson Internal | 2012-09-11 | Page
5CSCFCSCF-Call Session Control Function1. Proxy Call Session
Control Function (P-CSCF): first point of contact for the User
Equipment (mobile networks) or viaan SBG Keeps track of
registrations and supervises active call sessions. Stores the UE
Contact info2. Interrogating Call Session Control Function
(I-CSCF): Assigns an S-CSCF during initial registration, in
cooperation with theHSS. Routes SIP requests received from another
network towards theterminating S-CSCF3. Serving Call Session
Control Function (S-CSCF): Subscriber registration - acts as a SIP
Registrar. Downloading user profile from the HSS with service
trigger data. Querying the ENUM DNS for translation of E.164
numbers and domainnames. 6. Ericsson Internal | 2012-09-11 | Page
6The BGCF performs a number analysis and providesflexible breakout
routing if a called number doesntbelong to an IMS user.It performs
the following main task: Selection of routing destination based on
both A and Bnumber analysisBGCF : 7. Ericsson Internal | 2012-09-11
| Page 7The BCF gives the possibility for IMS users
temporarilyconnected to other networks to execute originating
IMSservices. It is located in the home network.It performs the
following main tasks: Signals HSS in order to determine if the
calling user is servedby this IMS network or not and if the user is
registered Forwards SIP requests to the originating S-CSCF if the
user isregistered. Rejects SIP Requests if the user is not
registered.BCF: 8. Ericsson Internal | 2012-09-11 | Page 8The Home
Subscriber Server (HSS) is an evolution of theHome Location
Register (HLR), the Authentication Center(AUC), and the
Authentication/Authorization/Accountingfunction (AAA).The HSS has
the following main capabilities: Identification of users.
Authentication and authorization of user accessHSS Home Subscriber
Server 9. Ericsson Internal | 2012-09-11 | Page
9SLFisusedtolocateinwhichHSSacertainsubscriptionisstored.ItisonlyusedifmultipleHSSnodesareimplementedinthenetworkTheSLFhasthefollowingmaincapabilities:AllowstheI/S/ECSCFandexternalASstofindtheaddressoftheHSSwhichholdstheuserdataforagivenuserActsasaDiameterRedirectAgentSLF
Subscription Locator Function 10. Ericsson Internal | 2012-09-11 |
Page 10The MRF contains functionality for manipulation of
multimediastreams such as, conferencing, multimedia message playing
andmedia conversion services. The MRF is composed of twofunctions
MRFC and MRFP.The MRFC has the following main capabilities: It is a
SIP signaling node that is brought into calls by the SCSCFor an AS
as required Controls one or several MRFPs Supports offline
chargingMRFC: 11. Ericsson Internal | 2012-09-11 | Page 11The MRFP
has the following main capabilities: Payload processing in
conversational multimediaservices Provides a set of codecs,
trans-coders and mixingfunctions to realize audio and video
manipulations.MRFP: 12. Ericsson Internal | 2012-09-11 | Page
12TheSAPCimplementsthePolicyandChargingRulesFunction,PCRF,whichisafunctionimplementedin3GPPR7.TheSAPChasthefollowingmaincapabilities:ProvidesbearerauthorizationandbearerchargingcontrolforservicesaccessedthroughtheGGSNEnsuresthattheproperQoSpoliciesforservicesareappliedintheGGSN.EnforceGatinginordertocontrolthestartofthemediaflow.PerformSession/Media.SAPC:
13. Ericsson Internal | 2012-09-11 | Page 13Presence is an enabler
that enhances IMS applications byproviding presence and group
management functionality.PGM provides: Presence FunctionalityStores
and distributes Group and data management Aggregation Proxy
(AP)APPLICATION SERVERS &ENABLERS:PGM 14. Ericsson Internal |
2012-09-11 | Page
14TheSBGprovidestheabilityofcorrelatingallSignalingandMediastreamspassingthenetworkbordersprovidingthefunctionalityrequiredtoaccessandinterconnect.ItFunnelssessionssignalingtogetherwithassociatedmediastreams.As
Access Session Boarder Gateway (A-SBG) in the crossingbetween an
access network and the IMS system, to funnelsessions from User
Clients to the ICS Core.As Network Session Boarder Gateway (N-SBG)
in thecrossing between an external network and the ICS. The N-SBG
also supports off-line charging.INTERCONNECT NODES:SBG 15. Ericsson
Internal | 2012-09-11 | Page 15MGC provides the signaling level
inter-working between theSIP session control signalling and ISUP
call controlsignaling to/from external PSTN and PLMN networks
andcontrols the Media Gateway resources.The MGC has the following
main capabilities: Supports addressing and routing of multimedia
sessions toand from CSCF and interconnected PSTN nodes. Performs
conversion of application level signaling(SIP/ISUP) Sends
accounting messages to the Charging Mediation Number Portability
supportMGC: 16. Ericsson Internal | 2012-09-11 | Page 16The MGW
provides the media interworking betweennetworks where Media
conversion is needed andsupports TDM-IP, TDM-TDM and IPIP
connections forboth voice and video.The MGW has the following main
capabilities: Adapts the payload carried on TDM circuits into
IPpackets Supports a number of codecs for Voice and Video
overIP.MGW Media Gateway: 17. Ericsson Internal | 2012-09-11 | Page
17SUPPORT SYSTEMS: 18. Ericsson Internal | 2012-09-11 | Page 18The
DNS/ENUM is used for Domain Name Service (DNS) andENUM queries by
all ICS nodes and by application servers in orderto resolve domain
names and E.164 numbers.The DNS/ENUM has the following main
capabilities: Resolves Fully Qualified Domain Names into
IP-addresses(DNS) Resolves phone numbers into rout-able
SIP-addresses (ENUM) DHCP for IPv4 and IPv6 networks Support for
Active SelectDNS/ENUM: 19. Ericsson Internal | 2012-09-11 | Page
19DNS CONNECTIVITY WITH NODES: 20. Ericsson Internal | 2012-09-11 |
Page 20EMA is the provisioning system that provides a
CustomerAdministration Interface to the operators business
supportsystem for the provisioning of IMS subscription data in
anIMS network.EMA has the following main capabilities: Provides the
CAI3G interface to the business systems. Provisions subscription
data towards the ICS Nodes(ENUM/DNS, HSS, SLF, and PGM) and
relevantApplication Servers.EMA: 21. Ericsson Internal | 2012-09-11
| Page 21Multi mediation server collect data from CCN SDP,MINSAT
VS,AIR and process CDR and then sends to DRS.Multi Mediation
enables operators to charge for any servicebased on any metrics,
online or offline.Its technology independent, supports access from
wirelineor mobile networks, from GSM, WCDMA, CDMA2000 andIMS
networks.MULTI MEDIATION: 22. Ericsson Internal | 2012-09-11 | Page
22OSS-RC is a flexible, modular system based on industrystandards
with an open and adaptable architecture used forOperation support
for Ericsson IMS applications as well asfor 2G / 3G radio networks,
and Mobile Softswitch.It supports the following key functional
areas: Fault Management Performance Management Configuration
ManagementO & M SUBSYSTEM: OSS-RC 23. Ericsson Internal |
2012-09-11 | Page 23SHUBHABRATA MUKHERJEE1STLA- LGI & ZIGGO
