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ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006
International Telecommunication UnionITU-T
Functional Architecture Model of NGN
Functional Architecture Model Functional Architecture Model of NGNof NGN
Naotaka MORITASenior Research Engineer, Supervisor
NTT Service Integration Labs.
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 2
ITU-T A NGN is a packet-based network able to provide telecommunication services and able to make use of multiple broadband,
QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies.
It enables unfettered access for users to networks and to competing service providers and/or services of their choice.
It supports generalized mobility which will allow consistent and ubiquitous provision of services to users.
Definitionof NGN(Rec.
Y.2001)
Target Standards Area
Generalized Mobility Convergence btw. Fixed & Mobile
Unrestricted Access Open Access I/F
Separation Services with Transport Architecture and Open API
QoS-enabled Transport
Multiple-BroadbandManageable Broadband
Definition & Features of NGN
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 3
ITU-T
• Transport functions assume packet-based integrated networks— The currently widely used IP protocol is the core protocol.• Service-related functions refer to basic and additional telephone connection functions and the
provision of functions inherent to services such as WWW and video distribution— Initial studies focused on session control functions for the implementation of IP telephony,
video chat, and video-conferencing using the SIP protocol as the core protocol.• The NGN separation model supports new independently developed technologies
and flexible system deployment and permits the formation of various businesses
NGN Transport Functions
NGN Service-Related FunctionsTelephone Services
Data Services (WWW, e-mail, etc.)Video Services (TV, movies, etc.)
Service-related functions and transport functions are separated into two strata
Internet Protocol(IP)
Anything and Everything
Everything(Any and All Network Technologies)
(Any/All Applicationse.g., voice, data, video)
Scope of the
Internet
“Service Stratum”
“Transport Stratum”
Reference: ITU-T Recommendation Y.2011 — General principles and general reference model for next generation networks
Characteristics of Next Generation Networks (NGN)
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 4
ITU-T
Y.NGN-FRA Figure 1. NGN architecture overview
Transport stratum
Service stratum
ControlMedia
Man
agem
ent
Func
tions
Management
ANI
Transport Control Functions
Resource and Admission
Control Functions
Network AttachmentControl Functions
NNIUNI
Note: UNI/NNI/ANI are not meant to represent any specific interfaces.(This type of note is written in TR-FRA word file.)
Application Support Functions & Service Support Functions
Applications
Transport Functions
End-UserFunctions
OtherNetworks
Service ControlFunctions
Service UserProfiles
Transport User Profiles
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 5
ITU-TIMS is a subsystem providing call processing and a variety of multimedia services in an IP-based packet-switching domain. — Provides voice, video, presence, messaging, conferencing, and other
services— Complies with IETF standardized session control (SIP); profiling— Independent of the access network— The application service platform itself is outside the scope of IMS
IMS is a subsystem providing call processing and a variety of multimedia services in an IP-based packet-switching domain. — Provides voice, video, presence, messaging, conferencing, and other
services— Complies with IETF standardized session control (SIP); profiling— Independent of the access network— The application service platform itself is outside the scope of IMS
Other IP/IMS Networks
Legacy/PSTN
Application Service Platform
IP Transport Network (IP-CAN)
IMS
IP-CAN: IP Connectivity Access Network
What is IMS?
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 6
ITU-T• Architecture centers on SIP proxy-equivalent Call Session Control Functions (CSCFs).• Employs a separation model that decouples media processing elements and their controlling
elements.• Links to transmission systems through a Gq interface.
AS: Application Server BGCF: Breakout Gateway Control Function CSCF: Serving CSCF HSS: Home Subscriber Server IP-CAN: IP-Connectivity Access Network ISC: IMS Service Control Interface MGCF: Media Gateway Control Function MGW: Media Gateway MRFC: Multimedia Resource Function ControllerMRFP: Multimedia Resource Function ProcessorP-CSCF: Proxy CSCF SLF: Subscription Locator Function
NGNs Based on IMS (from Y.IFN)
Other IP N
etworks
AS
I/S-CSCF
ChargingFunctions
« Core IMS»
Mw
Mx
Mr
MgMj
Mi
Mp MnGm
Gq'
ISC/MaCx Dx
DhSh
Ic
Rf/Ro
Rf/RoIb
Iw
Gq'
PSTN/ISD
N
MRFC MGCF
e2
Ie
Mw
MxMk
UE
Ut
BGCF
MxP-CSCF
NetworkAttachementControlFunction
Resource and Admission Control Function
IP Transport (Access and Core)
IBC-FE
NSIW-FESL-FESUP-FESAA-FE
MRP-FE TMG-FE
IBG-FE
SG-FE
Draft Recommendation Y-IFN: IMS for NGN
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 7
ITU-T
A
ProxyCSCF
ProxyCSCF
ServingCSCF
ServingCSCF
B
ProxyCSCF
ProxyCSCF
ServingCSCF
ServingCSCF
A’s Present Location (Hong Kong)
A’s Home Network(London)
B’s Home Network(New York)
B’s Present Location (Tokyo)
HSS-1 HSS-2
IP Backbone
Control signal
Voice, images, or other media
• In IMS nomenclature, the SIP proxy function is called the Call Session Control Function (CSCF).
• IMS defines a mobile-destination (roaming-destination) SIP server (proxy CSCF) in addition to the subscribing SIP server (serving CSCF) to allow authentication and QoS control by the mobile-destination network.
• IMS presumes that the serving CSCF cannot be accessed directly (a walled garden).
Roaming Implementation with Proxy CSCF
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 8
ITU-T
HSS
• In IMS, a CSCF is assigned to a user each time the user is registered (at power up). (This accounts for CSCF expansion, loading distribution, and risk distribution.)
• SIP signals from another network are first sent to the interrogating CSCF and then forwarded to the assigned CSCF.
• The interrogating CSCF has a topology hiding inter-network gateway function that can be deployed on the exit side as well.
• Fixed-network NGN discussions are permitting the deployment of a border gateway control function, which is different type of SIP proxy from an interrogating CSCF.
InterrogatingCSCF
InterrogatingCSCF
ServingCSCF
ServingCSCF
ServingCSCF
ServingCSCF
ServingCSCF
ServingCSCF
ServingCSCF
ServingCSCF
HSSHSS
Assignment Function(SLF)
Assignment Function(SLF)
InterrogatingCSCF
InterrogatingCSCF
Border GatewayControl FunctionBorder GatewayControl Function
I-CSCF: Interrogating CSCF
Topology HidingBy Encryption
Topology Hiding ByMessage Modification
Dynamic Assignment of SIP Proxies with Interrogating CSCF
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 9
ITU-T
SIP Server(S-CSCF)
SIP ASOSA AS CamelService
Environment
AS for third
parties
Separate Network
IMS
Application Layer
Service Control Layer HSS
APL of ASP
Web-typeAPL
Communication-typeAPL
IN-typeAPL
SDP (Service Delivery Platform)
• Implementation of new service functions(Examples: call-waiting, conferencing calls, ring-back music, IP centrex, calendar coordination)
• Three types of application servers that connect to SIP servers (S-CSCF):— OSA (Open Service Architecture Server)— SIP (SIP Application Server)— CAMEL (Camel Service Environment)• Additional studies are looking at the construction of a Service Delivery Platform (SDP) in the application layer
IMS and Applications
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 10
ITU-T
Y.NGN-FRA Figure 7. Application/Service support functions
A-3: APL-SCM-FE*
A-2: APL-GW-FE*
Applications
A-4: SS-FE
A-1: AS-FE*
Applic ation S uppo rt
Functions an d S ervice
Su pport Fu nctio ns
ANI
S-1: S-CSC-FE
S-4: SL-FES-15: MLT-FE
S-6: SAA-FE Service C
ontrol F
unction s
S-14: MRB-FE
S-13: MRC-FE
Note: * may include Authentication, Authorization, and Accounting
S-5: SUP-FE
A-S4A-S1 A-S2 A-S6A-S5A-S3
T-9: SG-FE
Transpor t Process ingF
unction s
End User Functions
A-U1 A-T1
UNI
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 11
ITU-T
Application
Scope of NGN
Man
agem
ent f
unct
ions
T-7:TrunkMediaGatew
ayFE
T-6:Inter-
connection Border
Gateway FE
S-6: S.Authentication & Authorization FE
S-8: Access GWControl FE
NACF RACF
LegacyTerminal
RGW
Customer Network
NGNTerminal
LegacyTerminal
ANIApplications
S-11: User Signaling Interworking FE
End-User Function
S-3: Interrogating Call Session Control FE
S-14: Media Resource Broker
FE
T-17: TransportResource Control FE
Access Packet Transport Functions
T-2: AccessNode FE
T-1: AccessMedia
GatewayFE
T-3: Edge Node FE
T-5:AccessBorder
GatewayFE
S-1: Serving Call Session Control FE
S-10: BreakoutGateway Control
FE
S-13: Media Resource
Control FE
Core Packet Transport Functions
T-8:Media
ResourceProcessing
FE
T-12: T. User Profile
FE
T-4: AccessRelay FE
S-2: Proxy Call SessionControl FE
T-10:Network Access
Configuration FE
S-4: Subscription Locator FE
S-5: S. User Profile FE
T-16: Policy Decision FE
S-12: Network Signaling
Interworking FE
T-9:Signallin
gGateway
FE
S-15:Multimedia
Service FE
NGN UNI
Other NGN
RACF
*
T-14: Access Management FE
T-15: Home GateWayConfiguration FE
T-11:T. Authentication &Authorization
FE
T-16: Policy Decision FE
T-17: Transport Resource Control FE
T-13: T. Locationmanagement FE
Application Support Functions & Service Support Functions(may include own Authentication, Authorization and Accounting)
other IP MMNetwork
(e.g. IMS)
PSTN/ISDN
S-9: Media GW
Control FE
S-7: Interconnection Border Gateway
Control FE
Core transport
Access transport
Service control
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 12
ITU-T
Y.NGN-FRA Figure 8 - Transport and service configuration of the NGN
LegacyTerminals
Note: Gateway (GW) may exist in either Transport Stratum or End-User Functions.
*
LegacyTerminals
Transport Stratum
Service Stratum
End-UserFunctions
Application Functions
Core transport FunctionsNGN
Terminals
CustomerNetworks
Other N
etworks
Application Support Functions and Service Support Functions
Core TransportFunctions
Other N
etworks
EdgeFunctions
Access Transport Functions
ServiceControl
Functions
Network Access
Attachment Functions
Network Attachment Control Functions
(NACF)
Access NetworkFunctions
Resource and AdmissionControl Functions
(RACF)
UserProfile
Functions
T. UserProfileFunctions
GWGW
Other Multimedia ServiceComponents …Streaming ServiceComponent PSTN / ISDN Emulation
Service ComponentIP Multimedia Component&PSTN/ISDN Simulation
IP MultimediaService Component
S. UserProfile
Functions
GWGW
Applications
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 13
ITU-T
Y.NGN-FRA Appendix I Figure I.5: NGN example of service domains
TransitNetwork
Internet Operator A
IP ConnectivityAccess Network
Core TransportNetwork
TransitNetwork
InternetServices
InternetServices
Operator B
Core TransportNetwork
IP ConnectivityAccess Network
AccessNetworkLaptop
Core Network FirewallIMS
Services
Non-SIPServices
AccessNetwork
Core NetworkIMS
Services1
3
2
1
32: IMS services: Non SIP service: Internet service
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 14
ITU-T
Y.NGN-FRA Figure 2: Charging and Billing Functions
Online ChargingOffline Charging NGN
Functional Entity
ChargingTrigger
Function
ChargingCollectionFunction
OnlineChargingFunction
Billing Domain and BackendSystems
AccountManagement
Function
RatingFunction
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 15
ITU-T
Y.NGN-FRA Appendix II Figure II.1 – Multi-Layered Transport Stratum
IPSEC tunnel
IP
Node-1WLAN Access
Controller
Node-3Home Agent
App
IP-A
IP-B
IP-C IP-C IP-C
App
IP-B IP-B
IP-AIP-A
Node-2IPSEC GW
Host-1
Host-2
Mobile IP (using co-located CoA)
ServiceLayer
TransportLayer
Application protocols (e.g. SIP)
Nodes connected with a solid line (blue) are Layer-3 adjacent
Nodes connected with a short- dashed line (black) are Layer-2 adjacent
Nodes connected with a long- dashed line (red) are adjacent at the application layer(e.g. client/server or peer-to- peer application entities)
Legend:
Represents a routed IP network
AAA
AAA
AAA
IPNetwork-A
IPNetwork-B
IPNetwork-C
Solid arrow (green) indicates AAA & DHCP flows
WLAN
ITU-T Workshop on “Next Generation Networks“Hanoi, Vietnam, 15-16 May 2006 16
ITU-T
Y.NGN-FRA Appendix III Figure III.1: Locations of S/BC functions
ServiceProvider C
ApplicationProviderNetwork
EnterpriseNetwork
OrAccessNetwork
OrTransit
Network
CCSP: Call Control Signalling Path MP: Media Path
Logical Interfaces
ServiceProvider
A
CCSP
MP MP
CCSP
MP
CCSP CCSP
MP
CCSP
MP
CCSP MP
CCSP
MP
Logical Interfaces
Logical Interfaces
CCSP MPCCSP MP
CCSP MP
Logical Interfaces
ServiceProvider
B
CCSP MP
CCSP MP
ApplicationProvider Network
CCSP MP
CCSP MP
CCSP MP
CCSP MP
EnterpriseOr Home Network
EnterpriseOr Home Network
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