ISO/TS 17429:2017
(Main)Intelligent transport systems — Cooperative ITS — ITS station facilities for the transfer of information between ITS stations
Intelligent transport systems — Cooperative ITS — ITS station facilities for the transfer of information between ITS stations
ISO/TS 17429:2017 specifies generic mechanisms enabling the exchange of information between ITS stations for applications related to Intelligent Transport Systems. It complies with the ITS station reference architecture (ISO 21217) and defines the following ITS station facilities layer functionalities: - Communication Profile Handler (CPH); - Content Subscription Handler (CSH); - Facilities Services Handler (FSH). These functionalities are used by ITS-S application processes (ITS-S-AP) to communicate with other ITS-S application processes and share information. These functionalities describe - how lower-layer communication services assigned to a given data flow are applied to the service data units at the various layers in the communication protocol stack (CPH, see 6.2.3), - how content from data dictionaries can be published and subscribed to by ITS-S application processes (CSH, see 6.2.5), - how well-known ITS station facilities layer and management services can be applied to application process data units (FSH, see 6.2.4), relieving (ITS-S) application processes from having to implement these services on their own, - how service access points (SAP) primitives specified in ISO 24102‑3 are used, - service primitives for the exchange of information between ITS-S application processes and the ITS station facilities layer (FA-SAP), and - a set of communication requirements and objectives (profiles) using the methods defined in ISO/TS 17423 to select the level of performance (best effort or real-time, etc.), confidence and security (authentication, encryption, etc.) for information exchange between ITS stations, such as data provision, event notification, roadside configuration, map update.
Systèmes intelligents de transport — ITS coopératifs — Fonctionnalités des stations ITS pour le transfert d'information entre stations ITS
General Information
Standards Content (Sample)
TECHNICAL ISO/TS
SPECIFICATION 17429
First edition
2017-03
Intelligent transport systems —
Cooperative ITS — ITS station facilities
for the transfer of information
between ITS stations
Systèmes intelligents de transport — ITS coopératifs —
Fonctionnalités des stations ITS pour le transfert d’information entre
stations ITS
Reference number
ISO/TS 17429:2017(E)
©
ISO 2017
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ISO/TS 17429:2017(E)
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ISO/TS 17429:2017(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 4
5 Conformance . 4
6 Overview . 5
6.1 Motivations . 5
6.1.1 Communication services . 5
6.1.2 General purpose ITS station facilities layer services . 6
6.1.3 Information sharing services . 7
6.2 Technical specification overview . 8
6.2.1 Architecture elements . 8
6.2.2 ITS-S application processes . 9
6.2.3 Communication Profile Handler (CPH) .10
6.2.4 Facilities Services Handler (FSH) .11
6.2.5 Content Subscription Handler (CSH) .12
6.2.6 Service access points (SAP) .12
6.2.7 Application data unit and protocol data unit .12
7 General requirements .13
8 Requirements for the “ITS-S application Processes” .13
8.1 ITS-S-AP: Requirements for data transmission .13
8.2 ITS-S-AP: Requirements for publishing and subscribing to data objects .13
8.3 ITS-S-AP: Flow type registration .14
8.4 ITS-S-AP: Transmitting data .14
8.5 ITS-S-AP: Receiving data .14
8.6 ITS-S-AP: Publishing data objects .14
8.7 ITS-S-AP: Subscribing to the reception of data objects .15
8.8 ITS-S-AP: Stopping the reception of data objects .15
8.9 ITS-S-AP: Receiving data objects .15
9 Requirements for the Communication Profile Handler .15
9.1 CPH: Initialization .15
9.2 CPH: Management of communication profiles .16
9.2.1 CPH: Communication flow profile parameters .16
9.2.2 CPH: Updating communication flow profile parameters .17
9.2.3 CPH: Reporting communication flow statistics .18
9.3 CPH: Processing data sent by ITS-S application processes .18
9.3.1 CPH: Processing TransmitFlowData instructions .18
9.3.2 CPH: Checking for a corresponding communication flow profile .19
9.3.3 CPH: Checking for an available path .19
9.3.4 CPH: Performing address resolution .19
9.3.5 CPH: Checking for ITS-S facilities services .20
9.3.6 CPH: Transmission to the NF-SAP .20
10 Requirements for the Facilities Services Handler .20
10.1 FSH: Initialization .20
10.2 FSH: ITS-S facilities layer protocol data unit format (ITS-FPDU) .21
10.3 FSH: Execution of facilities services .21
10.4 FSH: Transmission to the NF-SAP .22
10.5 FSH: Reception of messages .22
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ISO/TS 17429:2017(E)
11 Requirements for the Content Subscription Handler .22
11.1 CSH: Initialization .22
11.2 CSH: processing content publication from ITS-S-AP .23
11.3 CSH: processing content subscription from ITS-S-AP .24
11.4 CSH: processing content subscription cancellation from ITS-S-AP .24
11.5 CSH: transmitting content to ITS-S-AP .24
11.6 ITS-S generic data container format .24
12 FA-SAP service primitive functions .25
12.1 Overview .25
12.2 Error codes .25
12.3 TransmitFlowData .26
12.4 ReceiveFlowData .26
12.5 PublishContent .27
12.6 SubscribeContent .28
12.7 CancelContent .28
12.8 ReceiveContent .29
13 NF-SAP service primitive functions .29
13.1 ReceiveNTSDU .29
13.2 TransmitNTSDU .30
Annex A (normative) ASN.1 modules .31
Annex B (informative) Profiles .37
Bibliography .42
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ISO/TS 17429:2017(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
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on the ISO list of patent declarations received (see www .iso .org/ patents).
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The committee responsible for this document is ISO/TC 204, Intelligent transport systems.
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ISO/TS 17429:2017(E)
Introduction
ITS station units compliant with the ITS station reference architecture specified in ISO 21217 may
engage in Cooperative ITS (C-ITS) activities involving data exchanges between ITS stations in a variety
of roles. Such data exchanges include, but are not limited to:
— data collected by the roadside infrastructure and transmitted to traffic control centers, possibly
after aggregation,
— roadside equipment configured from the control centers to process a given set of data or issue
messages to vehicles,
— roadside events reported to control centers, and
— broadcast transmission of vehicle status and event messages (e.g. CAM) to nearby ITS stations.
An example of an ITS station unit engaged in a C-ITS activity is a roadside ITS station unit collecting
traffic-related information generated by road sensors and/or by vehicle ITS station units. The collected
data can often serve other purposes than the originally intended one. For example, the cooperative
awareness message (CAM) from the ETSI C-ITS message set generated for traffic-safety applications
can be collected by roadside ITS station units for exploitation by traffic efficiency applications in traffic
control centers (e.g. central ITS stations). The same information is thus used to improve road safety, as
well as traffic efficiency and also to reduce greenhouse gas emissions.
The exploitation of such exchanges for purposes not initially intended is made possible once this
exchange of information is performed in a standardized way through an ITS station facilities layer
that is able to recognize messages from specific message sets (e.g. DATEX II, TPEG, C-ITS message sets)
with data according to data object specifications from data dictionaries (e.g. the common ETSI data
dictionary) and to forward them to applications which have an interest therein and have subscribed to
the delivery of such message(s) and data. A Communication Profile Handler (CPH), a Facilities Services
Handler (FSH) and a Content Subscription Handler (CSH) are defined in this Technical Specification to
serve this purpose.
Outside of this Technical Specification, the commonly used term “message set” is used to indicate a
collection of “messages” used in the exchange of information between peer ITS station units (see
ISO/TS 17419). These messages are composed of structures sometime referred to as “data frames”
and/or “data objects” which are in turn composed of objects called “data elements” (see SAE J2735).
Herein, a slightly different lexicon is adopted. The term “data dictionary” is used to indicate a
collection of “messages”, including “data object” from which the messages are composed. Thus, herein,
“data objects” are synonymous with “data frames” and “data elements”. However, in this Technical
Specification, the terms are used with the precise meaning to distinguish messages and data objects
from which messages are constructed.
The functionalities specified in this Technical Specification include a Communication Profile
Handler (CPH), a Facilities Services Handler (FSH), and a Content Subscription Handler (CSH). These
functionalities are intended to enable, and be invoked by, technology-agnostic ITS applications and to
facilitate the deployment of C-ITS applications that share information. In particular, these functionalities
allow an application to
— specify a set of facilities layer services to be applied to its data units (ADUs),
— allow ITS station management to select the optimum communication profile (as a function of time)
for any or all of its data flows, and
— publish information to and subscribe to information from a central repository (the CSH) in a
standardized way that enables sharing of information between applications (the definition of C-ITS).
These functionalities provide a toolkit facilitating the specification of standards and the development
of ITS applications [e.g. In-Vehicle Signage (ISO/TS 17425), Contextual Speed (ISO/TS 17426), Point of
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ISO/TS 17429:2017(E)
Interest, Probe Data, IVI, LDM synchronization, remote ITS station configuration, and ITS applications
for freight, logistics, public transportation, etc.] complying with the set of Cooperative ITS standards.
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TECHNICAL SPECIFICATION ISO/TS 17429:2017(E)
Intelligent transport systems — Cooperative ITS — ITS
station facilities for the transfer of information between
ITS stations
1 Scope
This Technical Specification specifies generic mechanisms enabling the exchange of information
between ITS stations for applications related to Intelligent Transport Systems. It complies with the
ITS station reference architecture (ISO 21217) and defines the following ITS station facilities layer
functionalities:
— Communication Profile Handler (CPH);
— Content Subscription Handler (CSH);
— Facilities Services Handler (FSH).
These functionalities are used by ITS-S application processes (ITS-S-AP) to communicate with other
ITS-S application processes and share information. These functionalities describe
— how lower-layer communication services assigned to a given data flow are applied to the service
data units at the various layers in the communication protocol stack (CPH, see 6.2.3),
— how content from data dictionaries can be published and subscribed to by ITS-S application
processes (CSH, see 6.2.5),
— how well-known ITS station facilities layer and management services can be applied to application
process data units (FSH, see 6.2.4), relieving (ITS-S) application processes from having to implement
these services on their own,
— how service access points (SAP) primitives specified in ISO 24102-3 are used,
— service primitives for the exchange of information between ITS-S application processes and the ITS
station facilities layer (FA-SAP), and
— a set of communication requirements and objectives (profiles) using the methods defined in
ISO/TS 17423 to select the level of performance (best effort or real-time, etc.), confidence and
security (authentication, encryption, etc.) for information exchange between ITS stations, such as
data provision, event notification, roadside configuration, map update.
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.
ISO/TS 17419, Intelligent transport systems — Cooperative systems — Classification and management of
ITS applications in a global context
ISO/TS 17423, Intelligent transport systems — Cooperative systems — ITS application requirements and
objectives for selection of communication profiles
ISO 21217, Intelligent transport systems — Communications access for land mobiles (CALM) — Architecture
ISO 24102-3, Intelligent transport systems — Communications access for land mobiles (CALM) — ITS
station management — Part 3: Service access points
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ISO/TS 17429:2017(E)
ISO 24102-6, Intelligent transport systems — Communications access for land mobiles (CALM) — ITS
station management Part 6: Path and flow management
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
ITS-S application
ITS-S application process residing in the ITS-S application entity
[SOURCE: ISO 21217:2014, 3.18]
3.2
ITS-S application process
ITS-S-AP
element in an ITS station that performs information processing for a particular application, and uses
ITS-S services to transmit and receive information
Note 1 to entry: Examples of ITS-S application processes are contextual speed (ISO/TS 17426) and In-Vehicle
Signage (ISO/TS 17425).
[SOURCE: ISO 21217:2014, 3.19]
3.3
ITS-S capability
ITS-S capabilities
uniquely addressable protocol functionality
Note 1 to entry: Examples of ITS-S capabilities are Content Subscription Handler (CSH), Facilities Service Handler
(FSH), Communication Profile Handler (CPH).
[SOURCE: ISO 24102-6:2015, 3.6]
3.4
ITS-S facilities layer protocol data unit
ITS-FPDU
protocol data unit assembled by the Facilities Services Handler in the ITS-S facilities layer consisting of
nested protocol data units exchanged between peer facilities layer services in ITS-S
3.5
ITS-S communication profile
parameterized ITS-S communication protocol stack
[SOURCE: ISO/TS 17423:2014, 3.7]
3.6
ITS-S data container
sequence of type-length-value (TLV) encoded data objects
3.7
ITS-S data header
header of the “ITS-S generic data container format” uniquely identifying the data contained in the ITS-S
data containers by means of data dictionary identifiers unique in the ITS domain and the number of
data objects from the data dictionary in the container
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ISO/TS 17429:2017(E)
3.8
ITS-S flow
identifiable sequence of packets of a given ITS-S flow type transmitted between a source node and a
destination node
[SOURCE: ISO 24102-6:2015, 3.6]
3.9
ITS-S flow identifier
ITS-S-FlowID
identifier, being unique within the ITS station, that identifies an ITS-S flow
[SOURCE: ISO 24102-6:2015, 3.6]
3.10
ITS-S flow type
set of characteristics describing a data flow
[SOURCE: ISO 24102-6:2015, 3.6]
3.11
ITS-S flow type identifier
ITS-S-FlowTypeID
identifier, being unique within the ITS station that identifies an ITS-S flow type
[SOURCE: ISO 24102-6:2015, 3.6]
3.12
ITS-S generic data container format
format of an ADU exchanged between an “ITS-S application process” and a Content Subscription Handler
(CSH) or between two peer CSHs containing an “ITS-S data header” and followed by a number of “ITS-S
data containers”
3.13
ITS-S facilities header
header used to form an “ITS-S facilities layer protocol data unit”
3.14
ITS-S facilities service
ITS-S capability of the ITS-S facilities layer providing a service that may be applied to ADUs at the
request of the source ITS-S-AP
Note 1 to entry: Examples of ITS-S facilities services are “time stamping”, “geo-stamping”.
3.15
ITS-S managed service entity
ITS-S MSE
uniquely addressable entity in an ITS-S layer comprised of a set of related ITS-S capabilities
Note 1 to entry: Examples of ITS-S managed service entities are: a communication module in the ITS-S access
technologies layer (M5, cellular, etc.), a protocol suite in the ITS-S networking & transport layer (IPv6, FNTP,
GeoNetworking, 6LoWPAN, etc.), and MSEGenFac, the entity comprising the generic ITS-S facilities services
specified in this Technical Specification (CPH, CSH, the FSH and possibly more).
[SOURCE: ISO 24102-6:2015, 3.14]
3.16
registered ITS-S flow
ITS-S flow that has been allocated an ITS-S-FlowID
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ISO/TS 17429:2017(E)
4 Abbreviated terms
ADU application data unit
BSMD bounded secured managed domain (see ISO/TS 17419)
BSME bounded secured managed entity (see ISO 21217)
C-ITS cooperative ITS
CPH Communication Profile Handler
CSH Content Subscription Handler
FSH Facilities Services Handler
ITS intelligent transport systems (see ISO/TS 17419)
ITS-FlowTypeID ITS flow type identifier (see ISO/TS 17423)
ITS-FPDU ITS station facilities layer protocol data unit (see ISO 21217)
ITS-FSDU ITS station facilities layer service data unit (see ISO 21217)
ITS-PN ITS port number (see ISO/TS 17419)
ITS-S ITS station (see ISO 21217)
ITS-S-AP ITS-S application process (see ISO 24102-6)
ITS-S MSE ITS-S managed service entity
ITS-SCP ITS station communication profile (see ISO/TS 17423)
ITS-S-FlowID ITS station flow identifier (see ISO 24102-6)
LDM local dynamic map
MSEGenFac generic facilities ITS-S MSE
MSEGenFacID generic facilities ITS-S MSE identifier
SME station management entity
5 Conformance
Details on conformity of equipment with this Technical Specification and on conformance tests are
1)
specified in the multipart ISO 20594 :
— ISO 20594-1;
— ISO 20594-2;
— ISO 20594-3.
1) Under development.
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ISO/TS 17429:2017(E)
6 Overview
6.1 Motivations
6.1.1 Communication services
Abstracting applications from the communications services used to exchange information between peer
entities is a useful basic architectural principle of intelligent transport systems (ITS) embodied in the ITS
station and communication architecture presented in ISO 21217. Applications and the communications
services they use are linked together using the concepts of paths and flows and communication profiles
described in ISO 21217 with related path and flow management procedures specified in ISO 24102-6.
The ITS station management entity (SME) uses communication requirements and objectives provided
by the ITS station application processes (ITS-S-AP) as specified in ISO/TS 17423 together with the
“ITS-S capabilities” of each layer, dynamic information provided by each layer (computed internally or
collected from neighbour ITS stations) and sets of decision rules (regulations and policies) to select the
most suitable ITS-S communication protocol stack, also referred to as ITS-S communication profiles
(ITS-SCP), for each source of a potential flow as illustrated in Figure 1.
A set of communication requirements is referred to as a flow type (ITS-FlowType) in ISO 24102-6. There
are well-known registered Flow Types as specified in ISO/TS 17419. A
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