Development Scenario of SoftSwitch
Standards in China and China Telecom’s
Considerations on Network Evolution
Ms. Zhao Huiling
Chairperson of the Network and Switching
Technical Committee of CCSA
Vice President, Beijing Research Institute of China
Telecom
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Outline
SoftSwitch Standards Development in CCSA
China Telecom’s Considerations on Network Evolution
China Telecom Beijing Research Institute
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Development of SoftSwitch Industrial Standards
CCSA started to develop specifications and standards related to
softswitch network in 2001, which include:
Network equipment specifications and relevant testing specifications
Network protocol specifications and relevant testing specifications
Softswitch-based interface specifications and relevant testing specifications
Access equipment and terminals specifications and relevant testing
specifications
Softswitch-based access management specifications and relevant testing
specifications
Service architecture/API/service classification and general requirements
CCSA has published 59 series of softswitch specifications up to now.
China Telecom Beijing Research Institute
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SoftSwitch Functional Architecture
Service creation APIs
AAA Server
SNMP
H.323
Service Provision
Network Management, Billing
SSF
Interworking Function
Address Resolution/Routing
SoftSwitch device
Signaling
Gateway
NMS Server
To be decided
Radius
SS7/IP
App. Server
SIP
SIP System
SIP/BICC
INAP/IP
Call control
H.323/IP
Telephone
SoftSwitch
Signaling
Gateway
Current IN
NO.7
H.248
Media
Gateway
SIP
Terminal
China Telecom Beijing Research Institute
H.248
Terminal
MGCP
Terminal
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Delivery of NGN Services
PSTN /ISDN
Emulation
Service
From
From
Service
Service
pointof
of
point
view
view
PSTN /ISDN
Simulation
Service
IP
Multimedia
Service
Rf/Ro
APL GW
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Ut
Sh
Dh
Other IP MM
eg:IMS
I15
I9
SPF
SSF
I14
I11
UPF
CCF
PGCF
SIF
Charging
Functions
AS
ISC
UPSF
Dx
Cx
Mw/Mk/Mm
I/S-CSCF
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I5
Mj
Gq'
Mg
MRFC
MGCF
Ie
SGF
Gq'
RACF
I1
I3
I4
I6
MRPF
I2 ABGF
Legacy
teminal
AMGF
Packet Transport
Functions
I7
PGF
SGF
TMGF
Mn
Resource an d Admission Con trol Subsystem
I13
MRFP
PSTN/ISDN
UE
CS based
China Telecom Beijing Research Institute
Mp
Gm
T-MGF
IP Transport (Access and Core)
I-BGF
IMS based
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Ic
Mk
BGCF
Mw
P-CSCF
MGCF
IBCF
Mk
Mi
Mr
MRCF
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5
Other IP Networks
e2
RF
AGCF
Iw
Rf/Ro
Mw
« Core IMS »
Other PES
SLF
Ib
Network
Attachment
Subsystem
PSTN/ISDN
From
From
network
network
pointof
of
point
view
view
I9
I10
I10
Network Border
ASF
(may include own Authentication, Authorization and Accounting)
CCSA’s Contribution to International Standards
China submitted a total of 270 NGN-related contributions to ITU-T
SG11/13/19/FG from 2005 to February 2006.
The contributions cover a wide range of areas including service
requirement, architecture, security, QoS, future bearer network,
network evolution, signalling, FMC,and user database.
The quality of contributions is improving. 19 draft
recommendations on international standards were developed
based upon China’s proposals. Breakthroughs were made in the
following areas:
– Call server-based PSTN/ISDN Emulation: architecture and
network delivery.
– Resources control, including signalling requirement and
relevant requirements
– FMC: requirement and delivery
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Agenda
SoftSwitch Standards Development in CCSA
China Telecom’s Considerations on Network Evolution
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China Telecom Status (by 2006.2)
PSTN subscribers 154.5M
PHS subscribers
58.52M
Total: 213 M
Broadband subscribers 22.43M
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NGN Focuses at Different Stages
Near-term: tap
potentials and enhance
efficiency
Mid-term: broadband
mgmt. and contr.
Long-term: add value
Maturity of broadband managemen
And control technologies and
completion of IMS equipment testin
Deployment of large-scale softswitch
network
Deployment of small-scale
softswitch network
Completion of softswitch
national/corporate standards
1.
2.
1.
2.
3.
4.
5.
6.
7.
8.
Softswitch equip.
spec.
MGW equip. spec.
SIP spec.
H.323 spec.
H.248 spec.
MGCP spec.
Sigtran spec.
……
1.smart HLR trial
2001
2003
2.soft switch networks
trial
3.Interconnection
testing and
network access
testing
3.
Large-scale deployment
of smart HLR and
softswitch networks
Relations between IMS
and softswitch
IP backbone and IP
MAN
1.
2.
3.
4.
5.
6.
Control of broadband
value chain
Completion of
national/corporate IMS
standards
IMS equipment testing,
interconnection and
network access testing
IMS trial deployment
3G larges-scale
Development
FMC and Multi Play
Transition
2005
2008
NGN
NGNfocuses
focusesofofChina’s
China’sfixed
fixedoperators:
operators:
Near-term:
Near-term:enhance
enhanceeffectiveness
effectivenessand
andincrease
increasecash
cashflow
flowthrough
throughnetwork
networkintelligence
intelligence(smat
(smatHLR)
HLR)
Mid-term:
Mid-term:improve
improvethe
themanageability
manageabilityand
andoperability
operabilityofofbroadband
broadbandnetworks
networksand
andcreate
createaarational
rationalbroadband
broadbandvalue
valuechain
chain
totofacilitate
the
transformation
facilitate the transformation
Long-term:
Long-term:add
addvalues
values(multiplay
(multiplayand
andFMC)
FMC)based
basedupon
uponan
anintegrated,
integrated,manageable
manageableand
andoperable
operablebroadband
broadbandnetwork.
network.
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Smart HLR Introduced to Fixed Network
APP
APP Server
Server
SCP
SCP
Smart HLR system
INAP/SIP…
eg.MAP/Diameter
－Core: SHLR
－Switch,Softswitch
SHLR
SHLR
SHLR
－Application platform
－BSS/OSS
Extend ISUP/ Extend MAP
Switch
China Telecom Beijing Research Institute
OSS/BSS
components：
Application Platform
Softswitch
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Case of SHLR
Trial and Operation in Fujian Subsidiary
Oct. 2003 Initial trial in Quanzhou Branch
Oct. 2004 Commercial operation in Quanzhou Branch
Investment
Jan. 2005 Full upgrade in Fujian Subsidiary
RMB/User*
11.2
New Services Provided
4.5
SHLR Platform Construction
5.6
Switch Software&Hardware Upgrade
1.1
Supporting System Re-construction
Note: * Users based on total local subs as of 2004
China Telecom Beijing Research Institute
Number Portability
Simultaneous ring
Fixed-phone personal ring tone
One number
……
• Outcome as of Sept. 2005
Over 470 thousand users, accounting for
around 4% of total local subscribers
More than RMB 32 million revenue
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China Telecom’s SoftSwitch Strategy
Drives for evolution to softswitch
SS7
Long Distance Network
Requirements of
PSTN capacity expansion
Requirements of
AS Services
Integrated
SG
Toll Office
Softswitch
Local Network
Tandem Office
Requirements of
End TDM
office Switch substitution
POTS POTS POTS
POTS POTS POTS
PSTN
China Telecom Beijing Research Institute
TG
AG Requirements
IAD
of
New Subscriber expansion
POTS POTS POTS POTS POTS
Softswitch Network
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SoftSwitch Network Structure of China Telecom
Domain softswitch
Domain softswitch
Backbone
IP
Central service
platform
Service platform
Service platform
local
softswitch
softswitch
softswitch
IP
IP
Softswitch set centralized in
several domain
Softswitch set centralized
DC2
Tm
Ls
China Telecom Beijing Research Institute
Trunking
GW
AG/IAD
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Smart
HLR
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SIP Phone
13
Trial Commercial Services of China Telecom
Service name
Video
Communication
IP Centrex
UPT
Personal Tone
Web800
UC
(Unified
Communications)
Main function description
Point-to-point
subscribers
video
communication
for
broadband
Short-number service within broadband group subscribers
Fixed-line, PHS and mobile numbers are bound through UPT.
UPT and Personal Tone can be bound or provided separately.
‘PC-to-Phone’ 800 service
Combines enterprise office system with telecom capabilities.
Provides service features such as address book, point-topoint video, instant message, click-to-conference, etc.
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China Telecom’s NGN Practice
July 2001: Launched NGN softswitch trial project
July 2002 ~ Jan. 2003: Conducted Phase 1 field trial and evaluated
more than 2, 600 test items in 4 cities with products from 5 vendors
Apr.2003 ~ Dec.2003: Conducted Phase 2 field service tests,
including API test, interoperability test, service experiment, trial
running, etc.
2004: Put NGN softswitch in trial commercial deployment in
Guangdong, IPTV testing and commercial trial in 5 Province,
2005: Put NGN softswitch into commercial operation on long distance
networks and north China, deploy smart HLR in fixed network, IP
network “CN2” deployment
2006 ~ : focus on IMS solution for fixed operator and FMC
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China Telecom’s Considerations on Network Evolution
Phase II: Transformation Goals
Basically Fulfilled
Introductionof
ofIMS
IMSand
and
• •Introduction
Developmentof
ofFMC
FMC
Development
Phase I: Startup
Reconstructionof
ofIP
IPbearer
bearer
• •Reconstruction
networksand
andconstruction
construction
networks
ofsoftswitch
softswitchnetworks
networks
of
Upgradeof
ofservices
servicessystems
systems
• •Upgrade
andbroadband
broadbandaccess
access
and
networks
networks
2006
Integrated and
converged networks
Furtherintegration
integrationof
ofservice
service
• •Further
systemsand
andDevelopment
Developmentof
of
systems
broadband-basedmultiple
multiple
broadband-based
accesses.
accesses.
2008
China Telecom Beijing Research Institute
2010
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Future Core Control Network: Substantive Progress Made for
IMS Standards
Near-term: tap potentials
and enhance efficiency
Mid-term: broadband mgmt.
and contr.
Long-term: add value
HSS
ENIP
SIP AS
S-CSCF
I-CSCF
Gartner 2005 Report
AGCF
MSAN
P-CSCF
MGCF
TMG
323 PHONE
ENIP
SIP AS
SHLR
C5 SS
C4 SS
MSAN
TMG
SIP PHONE
SIP/323 PHONE
According to Gartner, IMS will become mature in 2 to 5 years.
According to Gartner, IMS will become mature in 2 to 5 years.
IMS is a better core network architecture for multimedia broadband users and softswitch is a mature control core of voice networks.
IMS is a better core network architecture for multimedia broadband users and softswitch is a mature control core of voice networks.
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NGN Is a Controllable Architecture
Telecom operators is seeking for solutions that can
control IP networks.
Providing operations with capabilities to control and
manage IP-based networks and services
Network convergence capabilities - IMS
Flexible extension and combination in the service
plane
Access control, ID and management in the user
access plane – NASS and RACE
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IMS Is the Future Platform of Convergence
Adoption of SIP signaling as call control, enhanced service
control capability.
Better openness and higher degree of standardization
IMS is the future network architecture, which can improve
the controllability and manageability of IP stream. IMS
architecture is design for service control and convergence.
Wireless and wire line access have a single core network, a
centralized user database in the network layer, an
integrated billing system and service development platform,
a unified services authentication architecture and automatic
roaming abilities through nationwide network.
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Considerations on IP MAN
Identify levels, enhance functions, standardize equipment and focus upon
performance
Clear Network levels. The separation of layer 2 and layer 3, construction of a clear 3layered routing network (backbone metropolitan area network) and a 2-layered
access network (broadband access network).
Flat network structure. Reducing the physical and logic cascade progression of IP
MAN through backbone MAN having large capacity and a small number of nodes and
broadband access network having wide coverage.
Differentiation of network quality. Differentiate service mechanisms through IP MAN
and provide differentiated services of varied QoS for different services and users.
Concentration of management and control. Construct a clear service access control
layer to have a centralized management and control of services BRASs and SRs.
Standardization of equipment requirements. The functions and performance of new
equipment must be able to meet the management requirements of the MAN.
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Unified User Database
Unified user database is a logic entity, It realizes centralized storage and usage of
user data based upon user databases of service networks.
Logic centralization. Data can be stored and used in a centralized way through the
introduction of a logic data layer and distributed database technology. All networks
have to go through the access gateways to access the integrated user database.
Unified user database
LDAP
Other user
database
SHLR
…….
Other user
database
HSS
HLR
Diameter
INAP
SIP/API SIP
PSTN/
PHS
softswitch
SIP
SS7
AG
IMS
PLMN
3G Radio
Networks
IAD
Need further study
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THANK YOU
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