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Development Scenario of SoftSwitch Development Scenario of SoftSwitch Standards in China and China Telecom Standards in China and China Telecom’ ’s s Considerations on Network Evolution Considerations on Network Evolution

• Ms. Zhao
• Ms. Zhao Huiling

Huiling Chairperson of the Network and Switching Chairperson of the Network and Switching Technical Committee of CCSA Technical Committee of CCSA Vice President, Beijing Research Institute of China Vice President, Beijing Research Institute of China Telecom Telecom

China Telecom Beijing Research Institute

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Outline

SoftSwitch Standards Development in CCSA China Telecom’s Considerations on Network Evolution

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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 specificat Network equipment specifications and relevant testing specifications ions Network protocol specifications and relevant testing specificati Network protocol specifications and relevant testing specifications

• ns

Softswitch Softswitch-

• based interface specifications and relevant testing specificatio

based interface specifications and relevant testing specifications ns Access equipment and terminals specifications and relevant testi Access equipment and terminals specifications and relevant testing ng specifications specifications Softswitch Softswitch-

• based access management specifications and relevant testing

based access management specifications and relevant testing specifications specifications Service architecture/API/service classification and general requ Service architecture/API/service classification and general requirements irements

CCSA has published 59 series of softswitch specifications up to now.

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SoftSwitch Functional Architecture

• App. Server

Service Provision Call control SSF

H.323 SoftSwitch SIP/BICC SIP Terminal H.248 INAP/IP To be decided NMS Server AAA Server Radius SNMP Service creation APIs Signaling Gateway Signaling Gateway

Current IN

H.323/IP Telephone SS7/IP SIP System SIP

Network Management, Billing Address Resolution/Routing Interworking Function

SoftSwitch device

NO.7 Media Gateway H.248 Terminal MGCP Terminal

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Delivery of NGN Services

From Service point of view From Service point of view

PSTN /ISDN Emulation Service

Other IP Networks

IP Transport (Access and Core)

T-MGF I-BGF

AS UPSF P-CSCF I/S-CSCF BGCF SLF

Charging Functions

IWF « Core IMS »

Mw Mw/Mk/Mm Mr Mg Mj Mi Mp Mn Gm Gq' ISC Cx Dx Dh Sh Ic Rf/Ro Rf/Ro Ib Iw Gq'

PSTN/ISDN SGF MRFC MGCF

MRFP Resource and Admission Control Subsystem

Network Attachment Subsystem

e2 Ie Mw

IBCF

Mk Mk

UE

Ut

UPF AGCF MRCF MGCF ASF (may include own Authentication, Authorization and Accounting) RF SPF

RACF

AMGF Legacy teminal Packet Transport Functions ABGF TMGF MRPF SGF PSTN/ISDN

Network Border

PGCF PGF I1 I2 I4 I5 I6 I7 I8 I9 I14 I3 I12 I11 I13 CCF SSF SIF I10 Other IP MM eg:IMS I15 I9 I10 APL GW Other PES UPF AGCF MRCF MGCF ASF (may include own Authentication, Authorization and Accounting) RF SPF

RACF

AMGF Legacy teminal Packet Transport Functions ABGF TMGF MRPF SGF PSTN/ISDN

Network Border

PGCF PGF I1 I2 I4 I5 I6 I7 I8 I9 I14 I3 I12 I11 I13 CCF SSF SIF I10 Other IP MM eg:IMS I15 I9 I10 APL GW Other PES

PSTN /ISDN Simulation Service IP Multimedia Service

CS based CS based IMS based IMS based

From network point of view From network point of view

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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

NGN focuses of China’s fixed operators:

Near-term: enhance effectiveness and increase cash flow through network intelligence (smat HLR) Mid-term: improve the manageability and operability of broadband networks and create a rational broadband value chain to facilitate the transformation Long-term: add values (multiplay and FMC) based upon an integrated, manageable and operable broadband network.

NGN focuses of China’s fixed operators:

Near-term: enhance effectiveness and increase cash flow through network intelligence (smat HLR) Mid-term: improve the manageability and operability of broadband networks and create a rational broadband value chain to facilitate the transformation Long-term: add values (multiplay and FMC) based upon an integrated, manageable and operable broadband network.

1. Control of broadband value chain 2. Completion of national/corporate IMS standards 3. IMS equipment testing, interconnection and network access testing 4. IMS trial deployment 5. 3G larges-scale Development 6. FMC and Multi Play

2001 2003 2005 2008

1. Large-scale deployment

• f smart HLR and

softswitch networks 2. Relations between IMS and softswitch 3. IP backbone and IP MAN

1. Softswitch equip. spec. 2. MGW equip. spec. 3. SIP spec. 4. H.323 spec. 5. H.248 spec. 6. MGCP spec. 7. Sigtran spec. 8. … … 1.smart HLR trial 2.soft switch networks trial 3.Interconnection testing and network access testing

Completion of softswitch national/corporate standards Deployment of small-scale softswitch network Deployment of large-scale softswitch network Maturity of broadband managemen And control technologies and completion of IMS equipment testin

Long-term: add value Mid-term: broadband

• mgmt. and contr.

Near-term: tap potentials and enhance efficiency

Transition

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Smart HLR Introduced to Fixed Network

Smart HLR system components： －Core: SHLR

－Switch,Softswitch －Application platform －BSS/OSS

OSS/BSS

SHLR

Switch Softswitch SCP SCP SCP APP Server APP Server APP Server

INAP/SIP… Extend ISUP/ Extend MAP eg.MAP/Diameter

Application Platform

SHLR SHLR

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Case of SHLR

Trial and Operation in Fujian Subsidiary

I nvestment

RMB/User*

11.2 4.5 5.6 1.1

Supporting System Re-construction Switch Software&Hardware Upgrade SHLR Platform Construction New Services Provided

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

• Oct. 2003 Initial trial in Quanzhou Branch
• Oct. 2004 Commercial operation in Quanzhou Branch
• Jan. 2005 Full upgrade in Fujian Subsidiary

Note: * Users based on total local subs as of 2004

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China Telecom’s SoftSwitch Strategy

Softswitch Network Softswitch Network PSTN PSTN

POTS POTS POTS POTS POTS POTS POTS POTS POTS POTS POTS POTS

Local Network Local Network Local Network Local Network Local Network Local Network Local Network Local Network

Tandem Office Tandem Office Toll Office Toll Office

Long Distance Network Long Distance Network Long Distance Network Long Distance Network Long Distance Network Long Distance Network Long Distance Network Long Distance Network

End office End office

SS7 SS7

IAD AG TG SG Softswitch AS

POTS POTS POTS POTS POTS POTS POTS POTS POTS POTS

Requirements of Requirements of PSTN capacity expansion PSTN capacity expansion Requirements of Requirements of TDM Switch substitution TDM Switch substitution Requirements of Requirements of Integrated Services Integrated Services Requirements of Requirements of New Subscriber expansion New Subscriber expansion

Drives for evolution to softswitch Drives for evolution to softswitch

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SoftSwitch Network Structure of China Telecom

IP IP

IP

Domain softswitch softswitch softswitch

Softswitch set centralized Softswitch set centralized DC2 DC2 Tm Tm Ls Ls Trunking Trunking GW GW AG/IAD AG/IAD

Backbone local

Smart Smart HLR HLR

Service platform Central service platform

SIP Phone SIP Phone

Domain softswitch

Service platform

softswitch

Softswitch set centralized in Softswitch set centralized in several domain several domain

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Combines enterprise office system with telecom capabilities. Provides service features such as address book, point-to- point video, instant message, click-to-conference, etc. UC (Unified Communications) ‘PC-to-Phone’ 800 service Web800 Fixed-line, PHS and mobile numbers are bound through UPT. UPT and Personal Tone can be bound or provided separately. UPT Personal Tone Short-number service within broadband group subscribers IP Centrex Point-to-point video communication for broadband subscribers Video Communication Main function description Service name

Trial Commercial Services of China Telecom

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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

• Reconstruction of IP bearer

networks and construction

• f softswitch networks
• Upgrade of services systems

and broadband access networks

• Reconstruction of IP bearer

networks and construction

• f softswitch networks
• Upgrade of services systems

and broadband access networks

2006 2008

• Introduction of IMS and

Development of FMC

• Further integration of service

systems and Development of broadband-based multiple accesses.

• Introduction of IMS and

Development of FMC

• Further integration of service

systems and Development of broadband-based multiple accesses.

2010

Phase I: Startup Integrated and converged networks

Phase II: Transformation Goals Basically Fulfilled

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Future Core Control Network: Substantive Progress Made for IMS Standards

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. 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.

Gartner 2005 Report

Long-term: add value Mid-term: broadband mgmt. and contr. Near-term: tap potentials and enhance efficiency

SHLR

ENIP MSAN C4 SS

TMG

SIP/323 PHONE SIP AS C5 SS

HSS

ENIP MSAN

AGCF

TMG

323 PHONE SIP AS

S-CSCF P-CSCF MGCF

SIP PHONE

I-CSCF

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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 3- layered 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.

Need further study Need further study

PSTN/ PHS PSTN/ PHS I AD AG softswitch

Unified user database Unified user database HSS HSS 3G Radio Networks 3G Radio Networks INAP LDAP SIP/API SIP

…….

SS7 SIP

I MS I MS PLMN PLMN

HLR HLR SHLR SHLR

Other user database Other user database

Diameter

Other user database Other user database

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