PSTNISDN Emulation Architecture

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PSTNISDN Emulation Architecture

• Baofeng (Felix), ZHANG Dongyang, FAN

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The definition of NGN (By ITU-T)

• Next Generation Network (NGN) is a IP-based
  network architecture, which has the following
  features
• Separation between service and transport
• Personal and Terminal Mobility
• Resource and admission control
• QoS selection control
• Accommodation of legacy terminals and systems

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Emulation, Key aspect for the Deployment of NGN
4G/B3G Core Network
2G
3G/NGN
AIPN
F-SoftX MG IAD(AG)
NG IMS?
IMS-based NGN
PSTN
3G R99 3G R4 M-SoftXMG
3GPP IMS 3GPP2 MMD
GSM
4G/B3G Network?
CDMA
M-SoftXMG
others?
How to make smoothly evolution is the Key.
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PES Position in NGN Architecture
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CS-based PES Functional Architecture
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Interworking Scenarios for CS-based PES
Interworking with IMS
Interworking with other CS-based PES
The external interface is different.
Interworking with PSTN/ISDN
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Proposition on CS-based PES

• Advantage
• Mature technology and products, easy to fully
  inherit PSTN services
• Disadvantage
• PSTN emulation and IMS will be two segregate
  domains, PSTN emulation is hardly to migrate to
  IMS.
• Disables the deployment of common control
  planes/platforms
• Difficult to enable service convergence

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IMS-based PES Functional Architecture
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Value Added Services architecture for IMS-based
PES
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Proposition on IMS-based PES

• Advantage
• Base on IMS architecture, PSTN Emulation can be
  realized under unified IMS architecture, which
  ensure the simplicity of network architecture
• Disadvantage
• PSTN service logic is in AS, the interface
  between AGCF and PSTN AS must be redefined.
• Full replication of PSTN services in IMS
  architecture can be inherited hardly. Such as
  hotline service, the event of user off hooking
  must be reported to PSTN AS, which will incur
  many complexity to the AGCF and PSTN AS.
• If PSTN as inherit all the legacy service, lots
  of work about standards and products must be
  submitted, which is not so smart.

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PES Relevant Standard Projects
Y.2001 of SG13
Multiple Deliverables in ITU-T for PES
Y.2011 of SG13
Y.NGN-FRA of SG13

• Y.NEV Evolution of networks to NGN
• Y.PIEV PSTN/ISDN evolution to NGN
• Y.EMSIM PSTN/ISDN emulation and simulation
• Y.CSEM Call Server based PSTN/ISDN Emulation
• Y.PIEA PSTN/ISDN emulation Architecture

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The FEs maps each other in FRA and PIEV
Keeping the consistence on Arc, with some
enhanced functions to support PES specific
requirements.
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Thank You
November 21, 2009