22-23 June 2004 TISPAN-3GPP Workshop - Sophia-Antipolis 1
TISPAN NGN Architecture
Overview
Richard Brennanpulver.com, WG2 Chair
Prepared with Bruno Chatras - France Télécom Leonardo Finizola e Silva - Alcatel
Adrianus Van ewijk - Alcatel
30-31 March 2005 TISPAN-3GPP Workshop - Washington 2
Agenda
1.1. Approval of agenda and DocumentsApproval of agenda and Documents2.2. Workshop objectivesWorkshop objectives3.3. NGN (Release 1) Architecture statusNGN (Release 1) Architecture status4. IMS Architecture and R6 & R7 status5. Review of the NGN-IMS issues & status6. Fixed Access to IMS issues/discussion7. Backbone issues/Interco schemes8. Session Border Controllers concept9. Current activities and work plan10.Next steps/Future cooperation11.Any other issue12.Wrap-up/closure
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Overall Architecture: WI 02007
Oth
er netw
orksOther
subsystems
Core IMS
PSTN/ISDN Emulationsubsystem
User Equ
ipmen
t
Service Layer
Transport Layer
Transfer Functions
Resource and Admission Control
Subsystem
Network Attachment Subsystem
Applications
Userprofiles
Service / Transport layer separation in line with ITU-T Y.2011!
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3GPP R6 and TISPAN R1 NGN: R6 Architectural comparison
Network Attachment 3GPP: GPRS entities + HLR (PS part) TISPAN: NASS entities
Resource Control 3GPP: PDF and GGSN TISPAN: RACS entities +
RCEF and BGF entitiesMM Session Control
3GPP: IMS (R6) TISPAN (R1) IMS (R6)
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Architecture Design A sub-system oriented approach, enabling:
The addition of new subsystems over the time to cover new demands and service classes.
To import (and adapt) subsystems from other standardisation bodies. Flexibility to adjust a subsystem architecture with no or limited impact
on other subsystems.
IP connectivity is provided using two subsystems: Network Attachment SubSystem (NASS) – WI 02021 Resource and Admission Control Subsystem (RACS) – WI 02020
First service-oriented subsystems include the 3GPP IMS (suitably adapted to the fixed BB access context) – WI 02029 a PSTN/ISDN Emulation Subsystem (PES) – WI 02019 and 02030.
Future service-oriented subsystems may include A streaming subsystem A TV Broadcasting subsystem Others as determined
DES/02007 has been Working Group approved at TISPAN#5bis
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TISPAN Architecture – DSL case
Resource and Admission Control Functionality
RACS
Based on
3GPP IMS
IP Connectivity
Access Network
And related functionality
Network AttachmentFunctionality
NASS
Other Multimedia Components …
Streaming Services (RTSP based)
Applications
Core transport NetworkAccess Transport
Network
IP
UserProfiles
Other N
etworks
PSTN / ISDN Emulation(SIP-I based)
A-MGF
PS
TN
/ISD
N
AccessNode
Core BorderNode
RACS
IP Multimedia Component (Core IMS)
(SIP based)
IP EdgeNode
L2TF
RCEFARF
C-BGF
T-MGF
TGW
I-BGF
BGW
R-MGF
RGW
IBCF
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TISPAN NGN Common Components
IBCF
IWF
Transfer Functions
Transport control
To/Fromother networks
Control Subsystems
Transport Layer
Service Layer
ASF(type 2)
UPSFASF(type 1) Data Collection
Charging mediation
Mediationto other
management applications
…
Roughly equivalent to the HSS
(excluding the HLR)
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Transfer Functions
T-MGF
I-BGFC-BGF
MRFP
Transfer Functions
SGF
ARF
RCEF
Oth
er netw
orks
User Equ
ipmen
t
Service Layer
A-MGF
NASS RACS
L2TF
Access Network Core Network
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Focus on the IMS subsystemO
ther n
etworks
Other subsystems
Core IMS
PSTN/ISDN Emulationsubsystem
User Equ
ipmen
t
Service Layer
Transport Layer
Transfer Functions
Resource and Admission Control
Subsystem
Network Attachment Subsystem
Applications
Userprofiles
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IMS Architecture in the NGN settingO
ther IP
Ne
two
rks
IP Transport (Access and Core)
T-MGF
I-BGF
AS
UPSF
P-CSCF
I/S-CSCF
BGCF
SLF
ChargingFunctions
IWF
« Core IMS»
Mw
Mw/Mk/Mm
Mr
Mg
Mj
Mi
Mp MnGm
Gq
ISC
Cx Dx
DhSh
Ic
Rf/Ro
Rf/RoIb
Ia
Id
PS
TN
/ISD
N
SGFMRFC MGCF
MRFP
Resource and Admission Control Subsystem
Network Attachment Subsystem
If
Ie
Mw
IBCFMk
Mk
UE
Ut
NetworkInterconnections
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NGN Impact on IMS Architecture
Almost no impact on the IMS functional architecture as such. The IMS architecture is already largely access independent! ETSI TISPAN variant of the IMS is described in WI 02029
Main impacts are on detailed procedures implemented by some of the functional entities (WI 02028), e.g. P-CSCF procedures have to be augmented with ALG-like
capabilities for supporting interactions with NAPT-(PT). Location information has to be inserted in SIP messages by the
P-CSCF.and on IMS SIP profile (WI 03019).
Specific functionalities for supporting IP interconnection are located outside the IMS component.
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Focus on NASSO
ther n
etworks
Other subsystems
Core IMS
PSTN/ISDN Emulationsubsystem
User Equ
ipmen
t
Service Layer
Transport Layer
Transfer Functions
Resource and Admission Control
Subsystem
Network Attachment Subsystem
Applications
Userprofiles
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Network AttachmentSubsystem (NASS) - Scope
Dynamic provision of IP address and other user equipment configuration parameters (e.g. using DHCP)
User authentication, prior or during the IP address allocation procedure
Authorization of network access based on user network profile
Access network configuration, based on user profile Location management (e.g. for emergency call, …) CPE configuration
Support for nomadicity and roaming: NASS can be distributed between a visited and home network
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NASS architecture
Access Management Function (AMF): translates network access signalling between CPE and NACF/UAAF
Network Address Configuration Function (NACF): IP address allocation and distribution of other network configuration parameters such as address of DNS server(s), address of signalling proxies for specific protocols
Customer Premises Equipment Control Function (CPECF): provides configuration information beyond what is already provided by the NACF.
Connectivity Session Location Repository Function (CLF): registers association between the IP configuration, access line specific info and user network profile. Provides mapping info to RACS. Provides location information to TISPAN NGN core subsystems
User Access Authorization Function (UAAF): performs user authentication, as well as authorisation checking, based on user profiles, for network access.
Profile Database (PDBF): store user network profile TE+CNG = CPE (customer premises equipment)
a4
Service control subsystems and
applications
TE CNG
a3 a1
a2
e1
e2 e4
e3
Resource and
Admission Control
Subsystem
CLF
NACF CPECF
AMF
PDBF UAAF
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Focus on RACSO
ther n
etworks
Other subsystems
Core IMS
PSTN/ISDN Emulationsubsystem
User Equ
ipmen
t
Service Layer
Transport Layer
Transfer Functions
Resource and Admission Control
Subsystem
Network Attachment Subsystem
Applications
Userprofiles
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RACS scope Service Based Local Policy Control: authorisation of QoS
requests and definition of the polices to be enforced by the bearer service network elements.
Support for Application Function (AF)-initiated AND CPE-initiated resource reservation requests QoS support over multiple access networks (e.g. ADSL and GPRS)
and CPE types.
Admission Control: Apply admission control to resource reservation requests Based on knowledge of transport resource availability over the “last-
mile access” and aggregation segments of the access network
NAPT/ Gate Control: controls near-end and far-end NAPT and FW functions, when required, between: two core TISPAN NGN networks or, at the border between core and access TISPAN NGN networks
RACS offers services to Application Functions (AF) that may reside in different administrative domains.
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L2T Point
RCEF
Core Border Node Ds Di
A - RACF
NASS
SPDF e4 Rq
Re
AF
CPEAccessNode
L2T Point
RCEF BGF
Ds Di
Transport Layer
A - RACF
NASS
SPDF
Ia
e4
Re
IP Edge
AF
Gq’ RACS
SPDF - Provides to AF a single point of contact - Authorization decision for QoS resource.
BGF - Located at the border of networks (access/core – core/core) - NAPT, Gate Control, packet marking, usage metering, traffic
policing RCEF - Located in the access network - gate control, packet marking, policing. A-RACF - Located in the access network - resource reservation and admission control
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Questions?