Internet / Next Generation
Emergency Calls
Ernst Langmantel
Technical Director, Austrian Regulatory Authority for
Broadcasting and Telecommunication (RTR GmbH)
The opinions expressed in this presentation are the personal views of
the author and do not prejudge decisions of the Austrian regulatory
authority
Contents
 Basic Service Architecture Elements
 Legacy networks (PSTN/ISDN, GSM/UMTS)
 Architecture – Outgoing Calls – Emergency Calls
 Internet
 Architecture – Outgoing Calls – Emergency Calls
 NGN (ITU/ETSI)
 Architecture – Outgoing Calls – Emergency Calls
 IETF/Internet and ITU/ETSI NGN – Synergies ?
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
Seite 2
Basic Service Architecture Elements
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
Seite 3
Networks and Terminals
Network of Networks
Network Edge
[Terminals,
Application servers]
Terminal
Terminal
Service Connectivity,
Signalling
Transport
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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Media Streams / User Data Path
Network of Networks
Network Edge
[Terminals,
Application servers]
Terminal
Terminal
Service Connectivity,
Signalling
Transport
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
Seite 5
Signalling
Network of Networks
Network Edge
[Terminals,
Application servers]
Terminal
Terminal
Service Connectivity,
Signalling
Transport
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
Seite 6
Legacy networks (PSTN/ISDN, GSM/UMTS)
Architecture – Outgoing Calls – Emergency Calls
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
Seite 7
PSTN /ISDN, GSM/UMTS – Architecture [simplified]
Service Connectivity,
Signalling
Service control and
physical routing points
combined in
“Telephone Exchanges”
Transport
Without service interconnection (service interoperability)
between networks the service area is restricted to area of individual networks
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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PSTN /ISDN, GSM/UMTS – Outgoing/ Emergency Call [simplified]
Caller / Called in Home Network
In case of emergency calls national
emergency routing information is
retrieved locally in the telephone
exchange or from a national data
base
H
Service Connectivity,
Signalling
H
Transport
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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GSM/UMTS – Roaming Outgoing /Emergency Calls [simplified]
Caller in Visited Network
In case of emergency calls national emergency
routing information is retrieved locally in the
telephone exchange or from a national data
base
Call control in visited network
PSAP
H
V
Service Connectivity
H
Transport
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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Internet
Architecture – Outgoing Calls – Emergency Calls
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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Internet Services - Architecture [simplified]
Service control (call control) at the
network edge. NO CONTROL of
network transport by service control
Service Connectivity,
Signalling
Transport
(IP-Packets)
ONLY IP-Interoperability necessary for GLOBAL service area !
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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Internet VoIP - Outgoing Call [simplified]
Global service area without service interoperability between providers
“Home
Position”
Service Connectivity,
Signalling
Transport
(IP-Packets)
IP-interoperability between networks
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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Internet VoIP – Outgoing Call [simplified]
Different Service/Application Providers
Interoperability between
services/ applications of
network edge, not relevant for
networks
Service Connectivity,
Signalling
Transport
(IP-Packets)
IP-Interoperability between networks
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
Seite 14
Internet VoIP - Emergency Call Solution (ECRIT) [simplified]
Where do I get
PSAP Url in visited
country?
LoST
H
H
PSAP
Service Connectivity,
Signalling
fully
distributed
international
emergency
routing data
base
Transport
(IP-Packets)
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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LoST Functionality (Location-to-Service Translation Protocol)
 Satisfies the requirements (draft-ietf-ecrit-requirements) for mapping
protocols
 Civic as well as geospatial queries
 civic address validation
 Recursive and iterative resolution
 Fully distributed and hierarchical deployment
 can be split by any geographic or civic boundary
 same civic region can span multiple LoST servers
 Indicates errors in civic location data  debugging
 but provides best-effort resolution
 Supports overlapping service regions
Source: SDO Emergency Services Coordination Workshop (5./6.10.2006, Columbia University, New York),
A Location-to-Service Translation Protocol (LoST)- Mapping Protocol Architecture, Ted Hardie, Andrew Newton, Henning
Schulzrinne, Hannes Tschofenig
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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LoST Conclusions
 Mapping is core component of emergency calling problem
 LoST fully international and distributed
 tries to avoid “who runs the root” problem
 optimized for efficient use in mobile end systems
Source: SDO Emergency Services Coordination Workshop (5./6.10.2006, Columbia University, New York),
A Location-to-Service Translation Protocol (LoST)- Mapping Protocol Architecture, Ted Hardie, Andrew Newton, Henning
Schulzrinne, Hannes Tschofenig
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
Seite 17
NGN (ITU/ETSI)
Architecture – Outgoing Calls – Emergency Calls
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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NGN – Architecture [simplified]
Service Connectivity,
Signalling
Service control and physical routing in
DIFFERENT network elements but fierce
control of transport resources by service
control within individual networks.
Physical Transport
(IP Packets)
Without service interconnection (service interoperability)
the service area is restricted to area of individual networks
(same as in legacy circuit switched networks)
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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NGN (IMS) - Outgoing Call [simplified]
Roaming User (Exception for Emergency Calls!)
Caller in visited network
Call control for roaming user from
“Home Position” (Internet-like) BUT
via visited network
H
Service Connectivity
V
H
Physical Transport
(IP-Packets)
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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NGN (IMS) - Emergency Call NGN [simplified]
Roaming User
Caller in visited network
Home Position lacks knowledge of caller
location and national emergency routing
in visited country
PSAP
Service Connectivity
V
H
Physical Transport
(IP-Packets)
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
Seite 21
NGN (IMS) - Emergency Call NGN [simplified]
Roaming User
Caller in visited network
In case of emergency calls also in NGN (like in
GSM/UMTS) invocation of call control in visted
network including access to national emergency
routing information to PSAP.
PSAP
H
V
Service Connectivity
H
Physical Transport
(IP-Packets)
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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IETF/Internet and ITU/ETSI NGN – Synergies ?
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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One “Emergency (IP-)World” ?
 A lot of synergies regarding ITU/ETSI NGN and IETF Internet standards are
already in place because 3GPP standardisation is done in collaboration with IETF
and NGN built on 3GPP specs.
 Global routing database (LoST) is key element in IETF ECRIT concept.
 Global IETF emergency call routing database should also be able to serve 3GPP
and NGN needs.
 No basic change to current basic NGN architecture necessary if NGN reuses IETF
data base. NGN Location Retrieval Function (LRF) could access LoST.
The goal:
Only one place for the emergency organisations
to put their routing requirements data!
“Single point of truth”
Can the two worlds come together ?
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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Further Information
 NGN
 ETSI NGN, IMS emergency session standards
 ETSI TS 102 424 (2005-09) – Requirements for the NGN network to support emergency communication
from citizen to authority
 Draft ETSI TS 182 009 (version 12.07.2006) – NGN Architecture to support emergency communication
from citizen to authority
 ETSI TS 102 164 (2006-09) – Emergency Location Protocols
 G. Camarillo, M. A. Garcia-Martin, The 3G IP Multimedia Subssystem (IMS), Wiley 2006
 IETF / ECRIT – Emergency Context Resolution using Internet Technologies
 http://www.ietf.org/html.charters/ecrit-charter.html
 A Wiki page that points to the most important documents:
http://www.tschofenig.com/twiki/bin/view/EmergencyServices/EcritReviews
(including link to SDO Emergency Services Coordination Workshop (ESW06))
 IETF: http://edu.ietf.org/
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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Thank you very much for your attention !
ITU Workshop "Future of Voice", 15./16.01.2007, Geneva
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