CEN/TS 17184:2018

SLOVENSKI STANDARD
01-oktober-2018
Inteligentni transportni sistemi - e-Varnost - Visokonivojski aplikacijski protokoli
za e-Klic z uporabo IMS v paketno preklopnih omrežjih
Intelligent transport systems - eSafety - eCall High level application Protocols (HLAP)
using IMS packet switched networks
Intelligente Verkehrssysteme - eSicherheit - Allgemeines eCall Anwendungsprotokoll
(HLAP) unter Verwendung von IMS paketvermittelnden Netzwerken
Ta slovenski standard je istoveten z: CEN/TS 17184:2018
ICS:
03.220.01 Transport na splošno Transport in general
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17184
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
August 2018
TECHNISCHE SPEZIFIKATION
ICS 35.240.60
English Version
Intelligent transport systems - eSafety - eCall High level
application Protocols (HLAP) using IMS packet switched
networks
Intelligente Verkehrssysteme - eSicherheit -
Allgemeines eCall Anwendungsprotokoll (HLAP) unter
Verwendung von IMS paketvermittelnden Netzwerken
This Technical Specification (CEN/TS) was approved by CEN on 16 March 2018 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17184:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Symbols and abbreviations . 14
5 Conformance . 16
6 General overview of the eCall session for Pan European eCall . 16
7 Requirements . 22
7.1 Procedures following power-up of the in-vehicle system . 22
7.1.1 General . 22
7.1.2 Enabled IVS. 22
7.1.3 Enabled PSAP . 23
7.1.4 IVS configured only for 112-eCall . 24
7.1.5 Self-test . 24
7.1.6 Standby mode applicable to IVS configured only for 112-eCall . 24
7.2 Activation . 24
7.2.1 Activation of pan-European IMS-eCall . 24
7.2.2 Activation of a test eCall . 25
7.3 Call set-up . 25
7.3.1 General . 25
7.3.2 IVS network access device (NAD) already registered on PLMN . 25
7.3.3 eCall in progress . 25
7.3.4 Network selection and registration . 26
7.3.5 Authentication of the subscriber . 26
7.3.6 IMS-eCall establishment . 26
7.3.7 Cell localization (by network) . 27
7.3.8 Manual termination of eCall by vehicle occupants before trigger confirmation . 27
7.4 MSD transfer in IMS-eCall . 28
7.4.1 General . 28
7.4.2 MSD transfer to a PSAP supporting IMS-eCall . 28
7.4.3 MSD Transfer to a PSAP not supporting IMS-eCall . 30
7.4.4 Security . 31
7.5 Application layer acknowledgement (AL- ACK). 31
7.6 In the event of IMS-eCall failure . 31
7.7 PSAP requests a new MSD . 32
7.7.1 General . 32
7.7.2 After session clear-down . 33
7.8 PSAP application features . 33
7.8.1 General requirements . 33
7.8.2 MSD display to the PSAP operator . 34
7.8.3 PSAP operator user interface . 34
7.9 Audio link to vehicle occupants . 34
7.10 eCall clear-down . 34
7.11 PSAP call back . 34
7.12 Rerouting to another PSAP/emergency control centre . 35
7.13 Handling non equipped situations / error cases . 35
7.13.1 MSD not transmitted correctly . 35
7.13.2 Network registration fails . 35
7.13.3 Call failure before the MSD is acknowledged . 35
7.13.4 Mobile network not supporting eCall URN or not provided with routing tables . 36
7.14 PSAP network/ICT failure . 36
7.14.1 General . 36
7.14.2 PSAP application failure . 36
7.14.3 PSAP operator does not respond . 36
7.14.4 PSAP system not available . 37
7.14.5 MSD corrupted . 37
7.14.6 Audio link not established . 37
7.14.7 Audio link established but subsequently fails . 37
7.14.8 Automatic repeat attempts . 38
8 Third party services supported eCall (TPS-eCall) . 38
9 Defences against attack (Security provisions) . 38
10 Quality of service requirements . 38
11 Test and conformance requirements . 38
12 Marking, labelling and packaging . 38
13 Declaration of patents and intellectual property . 38
Annex A (normative) Table of timings . 39
Annex B (informative) SIP and IMS explained . 41
B.1 Introduction. 41
B.2 Session Initiation Protocol . 41
B.2.1 SIP . 41
B.2.2 SIP URI . 41
B.2.3 SIP INVITE . 41
B.2.4 Request-Line-URI . 42
B.2.5 Via . 42
B.2.6 From . 42
B.2.7 To . 42
B.2.8 Contact . 42
B.2.9 Allow . 42
B.2.10 BYE . 43
B.2.11 CANCEL . 43
B.2.12 INFO . 43
B.2.13 INVITE . 43
B.2.14 NOTIFY . 43
B.2.15 OPTIONS . 43
B.2.16 PRACK . 43
B.2.17 REFER . 44
B.2.18 REGISTER . 44
B.2.19 SUBSCRIBE . 44
B.2.20 UPDATE . 44
B.3 IMS: Internet Protocol (IP) multimedia core network subsystem . 44
B.3.1 IMS Overview. 44
B.3.2 Roles of Session Control Functions . 47
B.4 Emergency Communications . 49
B.4.1 Overview of ETSI TS 123 167 . 49
B.4.2 High Level Procedures for IMS Emergency Services . 49
Bibliography. 55

European foreword
This document (CEN/TS 17184:2018) has been prepared by Technical Committee CEN/TC 278
“Intelligent transport systems”, the secretariat of which is held by NEN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Introduction
An eCall is an emergency call generated either automatically via activation of in-vehicle sensors or
manually by the vehicle occupants; when activated, to provide notification and relevant location
information to the most appropriate Public Safety Answering Points (PSAP), by means of mobile wireless
communications networks and carries a defined standardized minimum set of data, notifying that there
has been an incident that requires response from the emergency services and establishes an audio
channel between the occupants of the vehicle and the most appropriate PSAP.
EN 15722 specifies a standardized MSD for eCall, and EN 16072 specifies pan-European eCall operating
requirements (for third party systems, EN 16102 specifies third party services supporting eCall operating
requirements; see EC Communication on eCall Implementation 2009 [COM(2009) 434 final] and Official
Journal eCall Recommendation C_2011_6269, for more information) and EN 16062 specifies High Level
Application Protocols for eCall using GSM/UMTS.
The operating requirements for pan-European eCall are made using Public Land Mobile Networks
(PLMN) (such as GSM and 3G, and latterly LTE/4G/E-UTRAN), as specified in a number of ETSI standards
and technical specifications.
In order to provide the eCall service across a wireless network, high level application protocols are
required as an important essential element to affect this service provision.
NOTE The term PSAP, which is most widely used in the eCall documentation, European Commission
documents, etc., is used throughout this document and equates to the term emergency call response centre used in
the ITS Implementation Directive.
Subsequent to the publication of the suite of eCall standards which support the eCall Regulations,
EN 16072, EN 16062 and EN 16454, new communications technologies have become available. Over the
course of time, these networks (such as LTE/4G and in turn their successors) are expected to complement
and eventually replace the circuit switched GSM/UMTS networks. These technologies use so called
‘packet switched’ technologies using Internet protocols (IP). Particularly, 3GPP have evolved a
communication management system called IMS (Internet protocol Multimedia System) which is suitable
to operate over a number of bearer technologies, including LTE/ 4G/E-UTRAN.
In circuit switched networks the eCall is identified as an emergency call and specifically an eCall in the
telecircuit switching (TS) process. The long number is not dialled as the TS identifiers inform the MNO
that the call is an emergency call/eCall and the MNO has procedures to direct these calls to “the most
appropriate” PSAP. Having established a voice channel, GSM/UMTS eCall then mutes microphones and
speakers and uses a modem to transfer the Minimum Set of Data (MSD) to the PSAP before opening up
the line to enable conversation between the PSAP operator and the occupants of the vehicle.
In a ‘packet switched’ network, packets of data (including voice) are sent through an internet protocol
(IP) communication system, using SIP (Session Initiation Protocol) which is managed, most popularly
using IMS.
This document provides High Level Application Protocols (HLAP) for eCall using IMS. It therefore
provides the LTE/4G E-UTRAN equivalent of EN 16062 for GSM/UMTS and should be suitable for all/any
packet switched networks that support IMS and LTE/ 4G/E-UTRAN wireless access.
This document specifies the protocols to put into effect the pan-European eCall operating requirements,
and also identifies common elements that can be used in the link between third party services supporting
eCall and PSAPs.
The European Committee for Standardization (CEN) draws attention to the fact that, while no direct
patents are known in express regard to the content of these specifications, the underlying ETSI
communications Standards may involve patents and the reader is directed to the referenced ETSI
standards in these respects. Similarly, there is a default option to circuit switched eCall in the
specifications below which may involve the use of patents specified in EN 16062, and the reader is
directed to EN 16062 in respect of these aspects.
1 Scope
In respect of 112-eCall (pan-European eCall) (operating requirements defined in EN 16072), this
document defines the high level application protocols, procedures and processes required to provide the
eCall service via a packet switched wireless communications network using IMS (Internet protocol
Multimedia System) and LTE/ 4G/E-UTRAN wireless access.
NOTE 1 The objective of implementing the pan-European in-vehicle emergency call system (eCall) is to automate
the notification of a traffic accident, wherever in Europe, with the same technical standards and the same quality of
services objectives by using a PLMN (such as ETSI prime medium) which supports the European harmonized
112/E112 emergency number (TS12 ETSI TS 122 003 or IMS packet switched network) and to provide a means of
manually triggering the notification of an emergency incident.
NOTE 2 HLAP requirements for third party services supporting eCall can be found in EN 16102, and have been
developed in conjunction with the development of this work item, and are consistent in respect of the interface to
the PSAP. This document makes reference to those provisions but does not duplicate them.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 15722:2015, Intelligent transport systems – ESafety - ECall minimum set of data
EN 16062, Intelligent transport systems – ESafety - eCall high level application requirements (HLAP) using
GSM/UMTS circuit switched networks
EN 16072:2015, Intelligent transport systems – ESafety - Pan-European eCall operating requirements
EN 16102, Intelligent transport systems – eCall - Operating requirements for third party support
EN 16454, Intelligent transport systems – ESafety - ECall end to end conformance testing
CEN/TS 17240 , Intelligent transport systems – ESafety - ECall end to end conformance testing for IMS
packet switched based systems
ETSI TS 122 003, Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile
Telecommunications System (UMTS); LTE; Circuit Teleservices supported by a Public Land Mobile Network
(PLMN) (3GPP TS 22.003) [version 8.0.0, Release 8, and Release 14]
ETSI TS 122 011, Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile
Telecommunications System (UMTS); LTE; Service accessibility (3GPP TS 22.011) [Release 14 or later]
ETSI TS 122 071, Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile
Telecommunications System (UMTS); LTE; Location Services (LCS); Service description; Stage 1
(3GPP TS 22.071 [Release 14 or later]
ETSI TS 122 101, Universal Mobile Telecommunications System (UMTS); LTE; Service aspects; Service
principles (3GPP TS 22.101) [Release 14 or later]

Under preparation. Stage at the time of publication: FprCEN/TS 17240.
ETSI TS 123 122 V14.4.0 (2017-10), Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS); LTE; Non-Access-Stratum (NAS) functions related to
Mobile Station (MS) in idle mode (3GPP TS 23.122 version 14.4.0 Release 14)
ETSI TS 123 167 V14.5.0 (2017-10), Universal Mobile Telecommunications System (UMTS); LTE; IP
Multimedia Subsystem (IMS) emergency sessions (3GPP TS 23.167 version 14.5.0 Release 14)
ETSI TS 123 216, Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile
Telecommunications System (UMTS); LTE; Single Radio Voice Call Continuity (SRVCC); Stage 2
(3GPP TS 23.216) [Release 14]
ETSI TS 123 401 V14.7.0 (2018-04), LTE; General Packet Radio Service (GPRS) enhancements for Evolved
Universal Terrestrial Radio Access Network (E-UTRAN) access (3GPP TS 23.401 version 14.7.0 Release 14)
ETSI TS 124 229 Rel-14 (2018-04), Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS); LTE; IP multimedia call control protocol based on
Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 (3GPP TS 24.229
version 14.7.0 Release 14)
ETSI TS 124 301, Universal Mobile Telecommunications System (UMTS); LTE; Non-Access-Stratum (NAS)
protocol for Evolved Packet System (EPS); Stage 3 (3GPP TS 24.301) [Release 14]
ETSI TS 131 102, Universal Mobile Telecommunications System (UMTS); LTE; Characteristics of the
Universal Subscriber Identity Module (USIM) application (3GPP TS 31.102) [Release 14]
ETSI TS 133 203, Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile
Telecommunications System (UMTS); LTE; 3G security; Access security for IP-based services
(3GPP TS 33.203) [Version 8.8.0, Release 8, and Release 14]
ETSI TS 136 331, LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC);
Protocol specification (3GPP TS 36.331) [Release 14]
IETF RFC 8147, Next-Generation Pan-European eCall
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
single European emergency call number supporting Teleservice 12
Note 1 to entry: See ETSI TS 122 003.
3.2
Base Station Controller (BSC) area
area of radio coverage consisting of one or more cells controlled by one BSC
Note 1 to entry: The boundaries of a BSC area and a location area are independent; a location area may span the
boundary between BSC area and a BSC area may span the boundary between location areas.
3.3
call clear-down
termination of call and freeing up of line (usually achieved by hanging up the receiver or pressing ‘end
call’ or similar on screen)
3.4
cellular network
wireless communications network consisting of multiple adjacent access points (cells) with the capability
of homogeneous transfer of a communications session instance to an adjacent cell without significant
interruption to the session
3.5
data
representations of static or dynamic objects in a formalized manner suitable for communication,
interpretation, or processing by humans or by machines; in packet switched networks, voice is carried in
packets of data
3.6
data concept
any of a group of data structures (i.e. object class, property, value domain, data elements, message,
interface dialogue, association) referring to abstractions or things in the natural world that can be
identified with explicit boundaries and meaning and whose properties and behaviour all follow the same
rules
3.7
data element
single unit of information of interest (such as a fact, proposition, observation, etc.) about some (entity)
class of interest (e.g. a person, place, process, property, concept, state, event) considered to be indivisible
in a particular context
3.8
E112
emergency communications service using the single European emergency call number, 112, which is
enhanced with location information of the calling user
Note 1 to entry: The number is not actually used directly in the communication but sets indicators in the IMS call
header that identifies the call as an emergency call of type ‘eCall’ to the MNO.
3.9
eCall
emergency call generated either automatically via activation of in-vehicle sensors or manually by the
vehicle occupants
Note 1 to entry: When activated it provides notification and relevant location information to the most appropriate
Public Safety Answering Point, by means of mobile wireless communications networks, carries a defined standardized
minimum set of data (MSD) notifying that there has been an incident that requires response from the emergency
services, and establishes an audio channel between the occupants of the vehicle and the most appropriate Public
Safety Answering Point.
3.10
eCall generator
occupant of a vehicle or equipment within a vehicle that has cause to trigger an eCall session by automatic
or manual means
3.11
eCall identifier
flag, marking, element, or bit which is included in the emergency call set-up request message identifying
the call request as a manually or automatically initiated eCall, and which may be used by the mobile
network to process and route automatically and manually initiated eCalls to a designated PSAP
3.12
eCall service
end-to-end emergency service to connect occupants of an affected vehicle to the most appropriate PSAP
via an audio link across a PLMN together with the transfer of a minimum set of data to the PSAP
3.13
eCall session
establishment of a mobile wireless communications session across a public wireless communications
network and the transmission of a minimum set of data from a vehicle to a public safety answering point
and the establishment of an audio channel between the vehicle and the PSAP
3.14
Emergency Call Server (ECS)
functional entity that consists of a Location Retrieval Function (LRF) and either a routing proxy or a
redirect server, e.g. an ECS contains a VPC and a Routing Proxy or Redirect Server in NENA I2 architecture
3.15
emergency control centre
unit which deals with emergency calls and which has the capacity to consider professionally the need for
response, and which has the provision to mobilise the needed resources to deal with the emergency in
question
3.16
emergency call response centre
term used in ITS Implementation Directive to mean Public Safety Answering Point (PSAP)
3.17
identifier
label, symbol or token that names or identifies an entity or a collection of data or the means of designating
or referring to a specific instance of a data concept
3.18
in-vehicle equipment
equipment within the vehicle that provides or has access to in-vehicle data required for the minimum set
of data and any other data that is to be sent as part of or complementary to the minimum set of data to
effect the eCall session via a public mobile wireless communications network providing a link between
the vehicle and a means of enacting the eCall service via a public mobile wireless communications
network
3.19
in-vehicle equipment provider
provider of eCall in-vehicle equipment
Note 1 to entry: The in-vehicle equipment provider can be the vehicle manufacturer or the provider of aftermarket
equipment.
3.20
in-vehicle system (IVS)
in-vehicle equipment together with the means to trigger, manage and effect the eCall session
3.21
Location Area (LA)
area in which a mobile station may move freely without updating the VLR
Note 1 to entry: A location area includes one or several GERAN/UTRAN cells.
3.22
minimum set of data
standardized data concept comprising data elements of relevant vehicle generated data essential for the
performance of the eCall service
Note 1 to entry: See EN 15722.
3.23
mobile wireless communications network
wireless communications network with homogeneous handover between network access points
3.24
mobile wireless communications network device
device providing communications to a mobile wireless communications network with homogeneous
handover between network access points
3.25
most appropriate PSAP
destination for eCall defined beforehand by responsible authorities to cover emergency calls from a
certain area or for emergency calls of a certain type
Note 1 to entry: See also PSAP.
Note 2 to entry: A number of different instantiations of PSAP service are supported within this document. A PSAP
can be a Public Authority or a private service provider operating on behalf of the responsible authorities.
3.26
network access device (NAD)
see mobile wireless communications network device
3.27
network access points
beacon, antenna or similar source of signal propagation and receipt together with equipment to manage
communication sessions with users operating within the operating reach of the network access point and
provide connectivity for the users within the operating reach of the single access point to a wider
communications network
Note 1 to entry: A network access point may but does not need to provide homogeneous or heterogeneous
handover to another network access point.
3.28
public mobile wireless communications network
mobile wireless communications network with access to a public telecommunications network
3.29
Public Safety Answering Point (PSAP)
physical location working on behalf of the national authorities where emergency calls are first received
under the responsibility of a public authority or a private organization recognized by the national
government
Note 1 to entry: See also most appropriate PSAP.
Note 2 to entry: A number of different instantiations of PSAP service are supported within this document.
3.30
Radio Network Controller (RNC) area
area of radio coverage consisting of one or more cells controlled by one RNC
Note 1 to entry: The boundaries of a RNC area and a location area are independent; a location area may span the
boundary between RNC area and a RNC area may span the boundary between location areas.
3.31
Routing Area (RA)
area in which a mobile station, in certain operation modes, may move freely without updating the SGSN
Note 1 to entry: A routing area includes one or several GERAN/UTRAN cells and is always contained within a
location area.
3.32
service provider
physical and functional component responsible for providing telematics based services to its subscribers
3.33
vehicle manufacturer
entity which first assembles the vehicle and provides eCall equipment as part of its specification and
subsequently sells the vehicle directly or via an agent
3.34
vehicle occupant(s)
person(s) inside the vehicle
3.35
wireless communications network
network operating using an air-interface capable of bi-directional transfer of data and or voice
Note 1 to entry: There are different types of wireless communications such as PAN, LAN, cellular network, etc.
4 Symbols and abbreviations
3GPP Third generation mobile telecommunication system
ACK ACKnowledgement
AIeC automatic initiated eCall
BS bearer services
BGCF Breakout Gateway Control Function
BSC Base Station Controller
CAN controller-area network
CBN Core border node
CLF Connectivity session Location and repository Function
CRC cyclic redundancy check
CS Circuit switched
CSCF Call session control function
EATF Emergency Access Transfer Function
E-CSCF Emergency Call session control function
EC European Commission
ECS Emergency Call Server
ESRK Emergency Service Routing Key
ESRN Emergency Service Routing Number
ESQK Emergency service query key
ESRN Emergency Service Routing Number
ETSI European Telecommunications Standards Institute
GSM global system for mobile communications
HLR home location registry
HPLMN home public land mobile network
HRPD High Rate Packet Data
HSS Home Subscriber Server
IAM Initial Address message
IBCF Interconnection Border Control Functions
IETF Internet Engineering Task Force
IMS Internet Protocol Multimedia Service
IMS-MGW IMS Media Gateway
IMSI international mobile subscriber identity
IP-CAN Internet Protocol- connectivity access network
ISCF IPTV Service Control Function
IVS in-vehicle system
LAN local area network
LRF Location Retrieval Function
LRO Last routing option
LS Location Server
LTE long term evolution (of 3G UMTS access network)
MGCF Media gateway controller function
MGW Media Gateway
MIeC manually initiated eCall
MNO mobile network operator
MPC Mobile Positioning Centre
MRB Media Resource Broker
MRFC Multimedia Resource Function Controller
MRFP Multimedia Resource Function Processor
MSC mobile switching centre
MSD minimum set of data (EN 15722)
MSISDN mobile subscriber ISDN (integrated services digital network)
NAD network access device (e.g. a GSM or UMTS module)
NENA National Emergency Numbering Association
P-CSCF Proxy call session control function
PAN personal area network
PCRF Policy and Charging Rules Function
PDS Packet Data Subsystem
PLMN public land mobile network
PS Packet switched
PSAP Public Safety Answering Point
RDF Routing Determination Function
REQ REQuest
RNC Radio Network Controller
TEL-URI Telephone Uniform Resource Identifier
S-CSCF Serving call state control function
SDF Session Description Protocol
SET SUPL Enabled Terminal
SLP SUPL Location Platform
SLF Subscriber location function
SUPL Secure User Plane for Location
SUT system under test
TPS third party service
TPSP third party service provider
TS (i) technical specification
TS (ii) teleservice
TS12 Teleservice 12 ETSI TS 122 003
Tx transmit
UE User equipment (ETSI/3GPP term which general refers to the IVS in the context of
eCall)
UMTS universal mobile telecommunication system
USIM universal subscriber identity module
VLR visited location register
VPC VOIP positioning Centre
WGS world geodetic system
WGS 84 World Geodetic System; issue 1984 (last revised 2004]
5 Conformance
Conformance to the requirements of this document for eCall using packet switched IMS are to be found
in FprCEN/TS 17240.
This document makes no conformance specifications or requirements in respect of TPS eCall operating
requirements, and conformance requirements in respect of TPS eCall can be found in EN 16102.
6 General overview of the eCall session for Pan European eCall
In the introduction to the document, EN 16072, eCall was described as “an emergency call generated
either automatically via activation of in-vehicle sensors or manually by the vehicle occupants (the eCall
generator); when activated, it provides notification and relevant location information to the most
appropriate Public Safety Answering Point, by means of mobile wireless communications networks and
carries a defined standardized minimum set of data, notifying that there has been an incident that requires
response from the emergency services and establishes an audio channel between the occupants of the
vehicle and the most appropriate Public Safety Answering Point.
Figure 1 shows an illustrative view of the pan-European eCall service, as defined in EN 16072.
Figure 1 — General overview: 112-eCall service using GSM/UMTS
In circuit switched networks the eCall is identified as an emergency call and specifically an eCall in the
telecircuit switching (TS) process. The long number is not dialled as the TS identifiers inform the MNO
that the call is an emergency call/eCall and the MNO has procedures to direct these calls to “the most
appropriate” PSAP. Having established a voice channel, GSM/UMTS eCall then mutes microphones and
speakers and uses a modem to transfer the Minimum Set of Data (MSD) to the PSAP before opening up
the line to enable conversation between the PSAP operator and the occupants of the vehicle.
The high level paradigm for eCall remains unchanged, and the provision of this service using a Circuit
Teleservice supported by a Public Land Mobile Network (PLMN) (Teleservice 12/TS12) ETSI TS 122 003,
will remain operational and viable for many years – indeed for as long as GSM/UMTS PLMNs are available.
However, technology advances and subsequently to the development of the eCall application suite
EN 16072, EN 16062 and EN 16454 standards, packet switched networks have become available, and
over the course of time, these packet switched networks (such as LTE/4G/E-UTRAN) are expected to
provide new PLMNs to complement and eventually r
...