Idea Transcript
Basic NGN Architecture & Principles Keith G Knightson Canada
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NGN Architecture: Initial Considerations •
NGN difficult to define in absolute terms of: • specific technologies • specific architecture • topology
•
Need to avoid technology traps
•
Identify high-level paradigms • separation of concerns (and related functions) • technology agnostic
•
Identify emerging NGN-generic issues • Architectural principles • Need for NGN models to show separation of concerns/functions
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NGN Definition
Next Generation Network (NGN): 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.
ITU-T Recommendation Y.2001 3
What’s old: Vertically-Integrated Networks Pre-NGN Video Services (TV, movie, etc)
Telephone Services
Data Services (WWW, e-mail, etc)
Video Services Network
Telephone Services Network
Data Services Network
Policy Area 2
Policy Area 3
Policy Area 1
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What’s New: Horizontally-Integrated Networks NGN - Convergence Model Video Services (TV, movie, etc) Data Services (WWW, e-mail, etc) Telephone Services
NGN Services Point to point, Point to multipoint, Multipoint to multipoint
NGN Transport Point to point, Point to multipoint, Multipoint to multipoint
ITU-T Recommendation Y.2011 5
Networking Aspects
Network of Service Platforms
NGN
Telecomm Services Separation Transport
Network of Transport Components 6
Re-distribution of Service Intelligence Migration of Service Intelligence
Access User Domain Domain
Core Domain
Access Domain
User Domain
No 1:1 location correspondence between a switching component and a service component
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Service Separation
Application Server
Users
Application Server
Switched Core Packet Network(s)
Switched Access Network(s)
Transport Protocol Interworking
Single point Or Distributed Application
Switched Access Network(s)
Users
Transport Protocol Interworking
Transport only provides transfer between service platforms 8
Decoupling Services from Transport Network
Service Management Service Instance
Application Services Wholesale
Resource Management
AAA
Billing
Service infrastructure
Retail Service Management Transport Services
Service Instance
Resource Management
AAA
Billing
Settlement
Service infrastructure U
Subscriber
A10 NAP
NSP/ASP
Architectural and Business implications involved 9
Protocol Architectures: Layering Considerations Service Mapping & Protocol Translation
Protocol X
Service Mapping & Adaptation
Protocol Z
Peering Relationship Layering Relationship Protocol Y
No particular prescribed protocol hierarchy: Any X over any Y Layer Network see G.805/809 10
Protocol Architectures: Convergence Layer Layer n + i Layer n + 2 Layer n + 1
Set of application/service Functions (Fn+1….Fn+i)
Layer n = IP “Primary” and “ubiquituous” “convergence” Protocol Layer
Layer n - 1
Set of Transport Functions (Fn….Fn-j)
Layer n - 2 Layer n - j
G.805/G.809 principles apply
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NGN: IP as the Network Layer Protocol (Any/All Applications e.g. voice , data , video)
Services
Everything over Internet Protocol (IP)
Transport
Scope Of “NGN”
Over Everything (Any & All Network technologies)
Two Architectural Domains (Potentially two business and policy domains) 12
Simplified Protocol Architecture
Non-IP Services
Applications Application Helpers (UDP, TCP, RTP, etc)
IP MPLS or shim (Optional)
Ethernet LAN or MAN
Optical Bit Transport ADSL, Cable, etc
Not exhaustive, other combinations possible, but…. Convergence based on IP is the architectural trend
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Transport Convergence
Past : Seper. of Voice & Data Transp.
Circuit Switch. Access Capa.
Circuit Switch. Transp. Capa.
Packet Switch. Transp. Capa.
Future : Integration of V & D Access andTransp.
Near Past : Sep. of V & D Access
Circuit Switch. Access Capa .
Packet Switch. Access Capa .
Packet Switch. Transp. Capa.
Present : Integration of V & D Transport Circuit Switch. Access Capa.
Packet Switch. Access Capa.
Circuit Switch. Transp. Capa .
Packet Switch. Transp. Capa . Packet Switch. Access Capa.
Circuit Switch. Transp. Capa.
Packet Switch. Transp. Capa .
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Y.2011: Basic Functional Separation
Management Plane Control Plane User Plane
NGN Service Stratum
Management Plane Control Plane User Plane
NGN Transport Stratum
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Y.2011: Basic Functional Architecture Considerations Application, Middleware & Baseware services
Services Resources
NGN Service
NGN Transport
Service Management Functions
Transport Management Functions
Service Control Functions
Transport Control Functions
Transfer Functional Area
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Basic Functions
Service stratum Service stratum
Application functions Application functions
Customer Customer DB DB functionsfunctions
Service Service and and control control functions functions
Media handling functions
Tra nsport adaptation functions Customer functions
Customer functions
Transport adaptation functions Network entry functions
Access Access Transport Transport functions functions
Network entry functions
Access Network UNI Transport Access stratum Network Transport entry entry Transport functions functions functions functions
UNI
Core Transport Core Transpo rt functions functions
Media Gateway functions handling functions
Other Other networks networks
Other Other networks networks
Gateway functions
NNI
Core Transport Core Transport functions Control functions Media
Note: Charging and billing functions and Management functions are applied to both Service and Transport strata
Transport stratum
NNI
Control Media
Note: Charging and billing functions and Management functions are applied to both Service and Transport strata
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Y.FRA - Functional Requirements & Architecture (may include own Authentication, Authorization and Accounting)
A-2 Application Gateway Function S -9
S -17
User Profile DB Function
LS Function Management Function
S -1 Terminal Function
S -18 Session Control Proxy Function T-16
T-18
T-6 AMGF Management
S -19
Media Resource Control Function
Transport Adaptation Transport Resource / Policy Control Function
T. Authentication &Authorization Function
T-20 T.Network Access Control Function T-4 T.Network Access Process Function T-8 Mobility Support Function
T-11 Media Resource Processing Function
AGCF
S -12 MGCF
other IP MM Network (e.g. IMS)
T-12 SGF
T-3
Internet
T-13 T-15
Transport Resource & Enforcement Functions
PGF
Traffic Measurement Function
T-1 Packet Transport Function
Other NGN
T-9
Transport
T-7 Access Relay Function
PGCF
Session Control Function S -11
Session & Call Control
S -4
S.Authentication & Authorization Function S -10 Registration Function S -13
Network Border
Application
Application Server Function
A-1
PSTN/ISDN
TMGF
Scope of NGN All lines of this type attach to the corresponding input line at the CCF within session & call control
Connection point
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Component/packaging viewpoints
Applications Based on 3GPP IMS IP Connectivity Access Network And related functionality
User Profiles
Other Multimedia Components … Streaming Services (RTSP based)
IP Multimedia Component (Core IMS ) (SIP based)
Legacy Terminals
Customer Networks
GW
Network Attachment Functionality NASS
Access Transport Network
Resource and Admission Control Functionality RACS
Other Networks
PSTN / ISDN Emulation (SIP-I based)
Core transport Network
NGN Terminals
3GPP IP-CAN 3GPP Terminals
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IMS Architecture AS
Other IP Multimedia Networks PSTN
Sh
ISC Mm
MGW
BGCF PSTN
HSS (AAA+DB)
CSCF Mk
Mj
BGCF
Mn
Cx
Mw
Dh
Mi
Mg
Mb
MGCF
Mb
SLF
CSCF Dx
MRFP
Mr
Mb Mp
MRCF
Mb
IP Con nectiv ity Access Network
Mw
P -CSCF Gq
Gm
UE 20
Application Server Function (may include own Authentication, Authorization and Accounting)
A-2 Application Gateway Function
IMS
S-9
PSTN/ISDN simulation function
S-4 User Profile DB Function
LS Function
Multi media function
S-1 Messaging function Presence function
EMS
T-6 AMGF Management
S-19
Media Resource Control Function
T-16
Transport Adaptation Transport Resource / Policy Control Function
T-18 T. Authentication &Authorization Function T-20 T.Network Access T-7 Access Relay Control Function T-4 Function T.Network Access T-15 Transport Process Function Resource & T-8 Enforcement Mobility Support Functions Function
T-11 Media Resource Processing Function
AGCF
S-12 MGCF
T-1 Packet Transport Function
oth N (e
T-12 SGF
T-3
In
T-13 Traffic M easurement Function
O
PGF
Transport
Proxy Function
PGCF
Session Control Function S-11
S-18 Session Control Proxy Function
Terminal Function
NMS
S-17
S.Authentication & Authorization Function S-10 Registration Function S-13
Session & Call Control
PSTN/ISDN emulation function
Network Border
A-1
Application
Mapping To IMS
T-9
PS
TMGF
Scope of NGN All lines of this type attach to the corresponding input line at the CCF within session & call control
Connection point
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“Generalized” Mobility Device Mobilty Domain User/Service Mobilty Domain
Network
Legend :
Points of Attachment (POA) fixed or wireless Communications Objects (mobile with transient binding to POA) 22 Transient Binding
Fixed/Cellular Mobility
Radio Access Network
…. …. …. ….
Base Station Controller
Dual Mode Handset
Core Mobile Network
IP Access Network
UMA Network Controller
WiFi
How to integrate with fixed VoIP service? Cross Architectural impacts?
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Co-existing/converging mobile and fixed
Radio Access Network
…. …. …. ….
Base Station Controller
UMA-enabled Dual Mode Handset
GSM/IMS Core Service Architecture
Tunnelled IMS stack
WiFi RG
…. …. …. ….
GANC (UMA) Network Controller
IP Access Network
Native IP Stack
VoIP SIP Server
IP Core Transport
SIP Fixed/wireless Telephone 24
Scope and extent of Mobility levels Service Level Mobility
IMS
PSTN / SS7 GMSC
HA
FA
FA
PDG
GGSN
Inter-Access Network Level Mobility
Intra-Access Network Level Mobility Wide Area
FA LMA
LMA
ESS
ESS
DVB-GW
SGSN
SGSN
RNC/BSC
AP IPv4 MS + CCoA
AP
AP IPv6 MS + CCoA
AP
AP
DVB-TX
BTS
RNC/BS C
BTS
Intra-Access Network Level Mobility Local Area
MSC
RNC/BS C BTS
Intra-Access Network RadioLevel Mobility
BTS
IPv4 MS
WLAN / WiMAX
DVB / ISDB-T
GPRS/UMTS Data
Cellular Voice
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Home Gateway Functionality Desktop PC
Network Terminating Unit
10/100 Base-T
Desktop PC
Customer Premise Network
Routing Gateway
Set Top Box
Television Other Devices, Appliances, etc
Set Top Box Television …. …. …. ….
IP phone
QoS per device/terminal
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Traffic shaping in Routing Gateway RL
EF AF1
RL
AF2
ASP Access
AF3 AF4 BE Classifier
RL
EF
Data In
AF1 Data Out
S
RL
RL
AF2 AF3
PTA
AF4 BE RL
PPP Access (BE or AF)
PTA = PPP Termination Aggregation RL = Rate Limiter S = Scheduler
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Summary of Relevant Work •
Y.2001: NGN Overview • NGN Definition, Characteristics & Subject Areas
•
Y.2011: General Reference Model • Identify high-level paradigms • Separation of concerns, services from networks • Identify emerging NGN-generic issues • Architectural principles • OSI model relevance • G.805 relevance
•
Y.FRA: Functional Requirements & Architecture • Service control functions • Transport control functions • Mobility management functions • Wireless and Fixed access • IMS positioning • Multi-terminal/multi-QoS Home Gateway 28
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