Telecommunications Industry Association
TR41.4-05-08-007
Document Cover Sheet
Project Number
PN-3-4726-RV1 (to be published as future TIA TSB-146-A bulletin)
Document Title
Contribution to ‘IP Telephony Support for Emergency Calling Service’
Source
Alcatel
1, route du Docteur Albert Schweitzer
67408 Illkirch
France
Contact
Name: Patrick DANIEL
Distribution
TR-41.4
Intended Purpose
of Document
(Select one)
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Phone: +33 3 9067 6737
Fax: +33 3 9067 7050
Email: patrick.daniel@alcatel.fr
For Incorporation Into TIA Publication
For Information and debate
Other (describe) –
The document to which this cover statement is attached is submitted to a Formulating Group or
sub-element thereof of the Telecommunications Industry Association (TIA) in accordance with the
provisions of Sections 6.4.1–6.4.6 inclusive of the TIA Engineering Manual dated March 2005, all of
which provisions are hereby incorporated by reference.
Abstract
This contribution initializes a debate on Wireless IP Telephony Emergency Call as PSAP will have to be
regularly informed about the mobile devices under its geographical responsibility. Consequently, new
technologies have to be investigated.
This document provides some inputs for such debate.
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Telecommunications Industry Association
TR41.4-05-08-007
A new challenge to investigate: mobile positioning
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Introduction
Mobile positioning introduces more complexity to Emergency call scenario. Tracking is a complex process
as it includes new challenges like:
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support for different indoor and outdoor networks and positioning technologies
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interoperability between service providers
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compliance with country regulations on data privacy
The today status regarding the puzzle to set up shows that some elementary inputs like positioning
syntaxes and associated services are mostly defined (use of MLP technology for example) while global
Emergency call routing infrastructure on IP networking is clearly immature for mobile devices.
More, the size of the enterprises contributes to different positioning business models leading to different
architecture complexities:
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In case of campus networks like hospital & university, Indoor and Outdoor position
engines could be hosted and managed within this campus
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In case of mid –size enterprise, Indoor could be internally hosted and managed while
Outdoor could be supplied through an application subscription (supplied by either
Telecom Operator or Application Service Provider)
The global picture regarding the public infrastructure is consequently blurred. The main issue remains
how to be sure that a PSAP will be regularly informed about the mobile devices under its geographical
responsibility.
Another aspect concerns the location of home or remote workers especially for IP emergency calls.
These types of users are connected via an ISP or to a visited network to their enterprise network and the
location information should be acquired prior to call emergency service. Therefore ISP or visited network
should provide a standard and secure way to request such location information.
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Working groups to follow
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ETSI NGN / EMTEL is a special committee that addresses a broad spectrum of aspects
related to the use of telecom services in emergency situations
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IETF ECRIT. ‘Emergency Context Resolution with Internet Technologies’
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IETF GeoPriv working group looking generically at location services (privacy)
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IETF SIP/SIPPING working groups defining protocol for initiating IP session
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OMA (Open Mobile Alliance) facilitates global user adoption of mobile data services by
specifying market driven mobile service enablers that ensure service interoperability
across devices, geographies, service providers, operators, and networks
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Open Geospatial Consortium (OGC) is leading the development of standards for
geospatial and location based services. More precisely, OpenLS provides a standard set
of services that can be used by governments and their security forces to increase
productivity and make better decisions. A high level look at these uses includes
‘Response – Emergency dispatch’ and ‘Public Safety – Emergency notification’
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TR41.4-05-08-007
Technologies to investigate
It looks suitable to firstly investigate application-level protocols for getting the position of mobile devices
independent of underlying network technology. The Open Mobile Alliance has already started to specify
such protocols like MLP (Mobile Location Protocol) and RLP (Roaming Location Protocol) where defined
services also match the indoor requests.
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ETSI ELP ?
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IETF HELD (HTTP Enabled Location Delivery) which is a mechanism that employs HTTP
as a GeoPriv 'using protocol' to deliver location information relating to a client-device from
a Location Server
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IETF SIP and SIPPING
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OMA MLP
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OMA RLP
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OMA PCP (Privacy Checking Protocol) for interface between a Location Server and
Privacy Checking Entity
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OMA SUPL (Secure User Plane Location architecture) ?
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OpenLS Services
End of document
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