Transcript TD14

A snaphost on an
IMS-based PSTN/ISDN Emulation subsystem
3GPP – ETSI TISPAN Workshop
22 – 23 June 2004
B.Chatras
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IMS and PSTN/ISDN Emulation
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A lot of similarities
QTwo session-based control subsystems:
– For supporting multimedia services and PSTN/ISDN services simulation
(IMS)
– For supporting PSTN/ISDN services emulation
QAbove a managed IP network
QSupporting operators’ requirements
– Quality of service, Security, Charging capabilities, Regulatory constraints....
s
Clear Benefits
QEnables the deployment of common control planes/platforms
– Towards a unique infrastructure for supporting multimedia services and TDMswitches replacement
QEnables service convergence
– new voice services available to all types of subscribers
QEnables the scope of nomadism to be extended to legacy access lines
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Technical context
s
Requirements
QAll PSTN/ISDN services shall remain available and identical (i.e. with the
same ergonomics); such that end users are unaware that they are not
connected to a TDM-based PSTN/ISDN.
QEnd to End ISDN feature transparency shall be ensured for call transiting
through the PSTN/ISDN Emulation subsystem.
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Impact on IMS
QRequires new entities (residential/access gateways, access gateway
controller) with H.248 interfaces.
QRequires SIP with encapsulated ISUP.
QMost IMS entities re-used unchanged (transparent to the ISUP bodies) or
with minor changes (e.g. removal of ISUP body, based on destination).
QISDN/PSTN service logic / call model shifted to application servers.
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A candidate IMS-like functional architecture ?
PSTN/ISDN Specific
logic/data
Reference points
Dxx : DIAMETER
Sxx : SIP or SIP-I
Hxx : H.248
Ixx : TISPAN specific
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Flexible deployment options
IMS-like
PSTN/ISDN
Emulat ion
“ TISPAN” IMS
Funct ional View Point
PSTN/ISDN
Emulat ion
Cont rol Plane
“ TISPAN“ IMS
Physical View Point
Enables various degrees of convergence and a wide
range of implementation options
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Options for physical scenarios
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A unique infrastructure
QIdentical or similar functional entities from both functional planes are
merged in the physical plane into a single plateform.
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Two distinct infrastructures
QVarious physical configurations (incuding a basic softswitch-like
approach) can be envisioned for the PSTN/ISDN emulation
subsystem, based on different strategies for grouping functional
entities into physical platforms.
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Hybrid scenarios
QE.g. Platforms implementing MRFC/MRFP and/or MGC/IM-MGW are
shared by both subsystems. Other platforms are implemented
separatly.
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Backup Slides
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Changes to IMS interfaces/entities
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MRFC, MRFP, SLF: Unchanged.
s
S/I-CSCF, BGCF: Minor impact due to SIP-I relay.
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MGCF: Interworking procedures impacted by SIP-I.
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HSS: Impacted by the presence of PSTN/ISDN profile
information
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Specific entities : AGCF (i.e. RGW/AGW control) and
Application Servers hosting « class 5 » service logic.
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Emulation vs Simulation
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PSTN/ISDN Simulation
QThe provision of PSTN/ISDN-like services to advanced terminals such
as IP-phones. There is no strict requirement to make all PSTN/ ISDN
services available or identical, although end users expect to have
access to the most popular ones, possibly with different ergonomics.
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PSTN/ISDN Emulation
QMimicing a PSTN/ISDN network from the point of view of a legacy
terminal by an IP network, through a gateway. All PSTN/ISDN services
remain available and identical (i.e. with the same ergonomics); such
that end users are unaware that they are not connected to a TDMbased PSTN/ISDN.
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Example configurations
Z
H248
SIP-I
Z
H248
RGW
or
AGW
RGW
or
AGW
DSS1/IUA
S/T
Z
H248
SIP-I
H248
RGW
or
AGW
V5.2/V5UA
V5.2
Z
H248
SIP-I
AN
H248
RGW
or
AGW
Z
H248
RGW
or
AGW
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SIP-I
ISUP
H248
PSTN
/
ISDN
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