ISO 24102-6:2018

INTERNATIONAL ISO
STANDARD 24102-6
First edition
2018-05
Intelligent transport systems —
Communications access for land
mobiles (CALM) — ITS station
management —
Part 6:
Path and flow management
Systèmes intelligents de transport — Accès aux communications des
services mobiles terrestres (CALM) — Gestion des stations ITS —
Partie 6: Titre manque
Reference number
ISO 24102-6:2018(E)
©
ISO 2018

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ISO 24102-6:2018(E)

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© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
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ISO 24102-6:2018(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 3
5 Overview . 4
5.1 Relation with the ITS station reference architecture . 4
5.2 ITS-S flows. 4
5.3 ITS-S communication profiles . 4
5.4 ITS-S paths . 5
5.5 ITS-S capabilities . 6
5.6 Path and flow management . 6
5.7 ITS station management functionalities . 8
5.8 ITS station management information tables . . 9
5.9 Interaction with ITS station layers . 9
6 Requirements for flow management and communication profile selection .11
6.1 ITS-S flow type parameters .11
6.2 ITS-S flow parameters .13
6.3 ITS-S flow monitoring .14
6.4 Notification of a communication profile determination .15
6.5 Processing request to provide communication profiles .15
6.6 Processing flow statistic reports .15
7 Requirements for flow registration .16
7.1 Processing ITS-S flow type registration from ITS-S-AP .16
7.2 Processing RegisterFlow from ITS-S-AP .16
7.3 Processing ReleaseFlow request from ITS-S-AP .17
7.4 Checking ITS-S-AP credentials .17
7.5 Checking communication requirements .17
7.6 Checking ITS-S path availability .18
7.7 Communication profile determination .18
8 Requirements for path management .19
8.1 ITS-S path parameters .19
8.2 Topological and geographic position parameters .19
8.3 Collecting topological and geographical information.20
8.4 Path management .21
8.5 ITS-S path monitoring .21
8.6 Interface management .22
9 Requirements for path selection .22
9.1 General requirements for path selection . .22
9.2 Routing policies parameters .22
9.3 Notifying path selection .22
9.4 Notifying routing policies .23
10 Requirements for ITS-S capabilities management .23
10.1 Maintenance of ITS-S capabilities information .23
10.2 Determination of internal ITS-S capabilities .24
10.3 Determination of neighbour ITS-S capabilities .24
10.4 Activating ITS-S capabilities in the ITS-S Managed Service Entity .24
10.5 Suspending ITS-S capabilities in the ITS-S Managed Service Entity .24
10.6 Resuming ITS-S capabilities in the ITS-S Managed Service Entity .25
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10.7 Reporting about ITS-S capabilities in the ITS-S Managed Service Entity .25
Annex A (normative) M*-COMMANDs from SME .26
Annex B (normative) M*-REQUESTs to the SME .37
Annex C (normative) PFM error codes .45
Annex D (normative) ASN-1 modules .46
Bibliography .64
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ISO 24102-6:2018(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
through ISO technical committees. Each member body interested in a subject for which a technical
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
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
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
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For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.
A list of all parts in the ISO 24102 series can be found on the ISO website.
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ISO 24102-6:2018(E)

Introduction
This document is part of a series of International Standards for communications access for land mobiles
(CALM). An introduction to this series of International Standards is provided in ISO 21217:2014.
This document is Part 6 of a series of International Standards that specifies path and flow management
as part of the local ITS station management.
The ITS station management entity provides functionalities related to the management of communication
protocol layers and the security entity presented in the ITS station reference architecture specified in
ISO 21217:2014 and presented in Figure 1 — ITS station reference architecture.
Figure 1 — ITS station reference architecture
The ITS station management entity is specified as a distributed process, where no supervisory entity is
employed.
This document defines the functionalities of the ITS station that are used to collect the information
necessary for path and flow management:
— the capabilities of all layers of the ITS station (functionalities, technologies and protocols) supported
by the ITS station;
— the capabilities of neighbour ITS stations (functionalities, technologies and protocols) supported by
the neighbour ITS stations;
— the current network conditions (availability and characteristics of a communication interface,
availability of Internet access, etc.);
— the existing data flows and their communication requirements (identity of the destination node,
security procedures applied to the data flow, end-to-end delay, packet size, etc);
— the available routing paths to a destination node;
— how a data flow is mapped to the selected routing path.
The information collected by the ITS station management entity is used to determine the most
appropriate communication profile (facilities protocols, transport protocols, network protocols, access
technologies and communication channels) and routing path indicating where to route packets of each
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ISO 24102-6:2018(E)

data flow, according to the communication requirements provided by the application and depending on
the current network conditions. The method to perform this determination has competitive value and
is out of scope of this document.
This document provides a detailed specification of the concept of paths and flows introduced in
[17]
ISO 21217:2014. It complements ISO 17423:2018, ISO/TS 17429:2017, and ISO 24102-3 . The concept
of paths and flows is essential for abstracting ITS station applications from the communications
services available in the ITS station and for selecting the most appropriate communication profile (i.e.
protocol stack).
The functionalities specified in this document apply to all types of ITS stations without distinction. They
are useful for ITS stations equipped with various access technologies and/or various protocol stacks.
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INTERNATIONAL STANDARD ISO 24102-6:2018(E)
Intelligent transport systems — Communications access
for land mobiles (CALM) — ITS station management —
Part 6:
Path and flow management
1 Scope
This document specifies parameters and procedures for the ITS station management entity to manage
data flows and routing paths associated with available communication resources in an ITS station, and
to map data flows to routing paths.
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 17423:2018, Intelligent transport systems — Cooperative systems — ITS application requirements and
objectives for selection of communication profiles
ISO/TS 17429:2017, Intelligent transport systems — Cooperative ITS — ITS station facilities for the transfer
of information between ITS stations
ISO 21217:2014, Intelligent transport systems — Communications access for land mobiles (CALM) —
Architecture
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
anchor node
logical node contained in an ITS-S path which, when instantiated, has a locator known by the source node
3.2
destination node
communication end point of an ITS-S path
Note 1 to entry: In multicast operation, there can be many distinct destination nodes.
3.3
ITS-S egress anchor node
second (last) anchor node contained in an ITS-S path
3.4
ITS-S ingress anchor node
first anchor node contained in an ITS-S path
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3.5
ITS-S anchor segment
segment of an ITS-S path that starts at an ITS-S ingress anchor node and ends up at an ITS-S egress
anchor node
3.6
ITS-S capability
uniquely addressable protocol or functionality that is part of an ITS-S Managed Service Entity
Note 1 to entry: Examples of ITS-S capabilities in the ITS station facilities layer are generic ITS-S facilities
layer services specified in ISO/TS 17429 (Communication Profile Handler, Facilities Services Handler, Content
1)
Subscription Handler), the position and time service defined in ISO/TS 21176 , the security service defined
2)
in ISO/TS 21177 ; examples of ITS-S capabilities in the ITS-S networking and transport layer are IPv6
functionalities defined in ISO 21210 (IPv6 neighbour discovery, IPv6 forwarding, IPv6 mobility support, …), the
3)
fast service announcement protocol defined in ISO 22418 , etc.
3.7
ITS-S communication profile
ITS-SCP
parameterized ITS-S communication protocol stack (set of protocols composing all the ITS station
layers) that allows communication end points to communicate with one another
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
3.9
ITS-S flow identifier
FlowID
identifier, being unique within an ITS station unit, that identifies an ITS-S flow
3.10
ITS-S flow type
set of characteristics describing a data flow
Note 1 to entry: Flow types could be pre-assigned, well known and recorded with some authority registry or
defined by the applications following a number of conventions
3.11
ITS-S flow type identifier
FlowTypeID
identifier being unique within the ITS station that identifies an ITS-S flow type
3.12
ITS-S path
directed sequence of nodes connected by links starting at a source node, traversing a communication
interface of the source ITS-S, an ITS-S ingress anchor node and an ITS-S egress anchor node, ending at a
destination node
Note 1 to entry: In some circumstances, the ITS-S ingress anchor node and the ITS-S egress anchor nodes might
be collapsed with the destination node (i.e. the roles of the ITS-S ingress anchor node and the ITS-S egress anchor
node are played by the destination node).
Note 2 to entry: For bidirectional communications, two such ITS-S paths exist, i.e. one starting at each
communication end point. Note further that there could be multiple ITS-S paths between a source and its
destination.
1) Under development.
2) Under development.
3) To be published.
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3.13
ITS-S path identifier
PathID
identifier of a given ITS-S path being unique within an ITS station
3.14
ITS-S managed service entity
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 and transport layer (IPv6, FNTP,
GeoNetworking, 6LoWPAN, etc.), the generic facilities MSE at the ITS-S facilities layer.
3.15
locator
identifier of the topological location of a node in a communication network
Note 1 to entry: A locator of an ITS station is the identifier of an ITS-S ingress anchor node (an ITS station has as
many locators as there are ITS-S ingress anchor nodes to which it is attached).
3.16
registered ITS-S flow
ITS-S flow that has been allocated an ITS-S FlowID
3.17
source node
communication end point that creates packets for transmission to peer entities
4 Symbols and abbreviated terms
[14]
CI Communication Interface, see ISO 21218
ITS-S-FlowID ITS Station Flow Identifier
ITS-S-FlowTypeID ITS Flow Type Identifier
ITS-S ITS station, see ISO 21217:2014
ITS-S-AP ITS Station Application Process
ITS-S-APID ITS Station Application Process Identifier
ITS-SCP ITS station communication profile
[16]
ITS-SCU-CMC ITS-SCU Communication Management Centre, see ISO 24102-2
MSE ITS station Managed Service Entity
PathID ITS station Path Identifier
PFM, pfm Path and Flow Management
SAL ITS Station Access Layer
SFL ITS Station Facilities Layer
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SME ITS Station Management Entity
SNTL ITS Station Networking and Transport Layer
[14]
VCI Virtual Communication Interface, see ISO 21218
5 Overview
5.1 Relation with the ITS station reference architecture
This document specifies functionalities of the ITS “Station Management Entity” (SME) of the
communication architecture specified in ISO 21217:2014. The layered ITS station communication
architecture is illustrated in Figure 1 — ITS station reference architecture. The ITS “Station Facilities
Layer” (SFL), the ITS “Station Networking & Transport Layer” (SNTL), and the ITS “Station Access
Layer” (SAL) are each capable of containing multiple managed service entities (ITS-S Managed Service
Entity) running simultaneously as detailed in ISO 21217:2014.
5.2 ITS-S flows
In general, an ITS station supports multiple ITS-S applications of different types such as applications
for road safety, traffic efficiency, value added services and infotainment. Each application that
needs to send and receive data is most often either engaged in a bidirectional exchange with known
communication peers, or is repetitively broadcasting data to unidentified receivers. The nature of the
transmitted information is known and communication requirements are typically specific to the type
of data flow (road safety, traffic efficiency, infotainment). These communication requirements can be
expressed in terms of bandwidth, end-to-end delay, security, packet size, etc. for each type of data flow.
A list of requirements is provided in ISO 17423:2018.
The ITS-S flow type allows the classification of data flows with the same characteristics, transmitted
from distinct ITS stations or to distinct destination nodes. However, in the common situation in which
several applications are installed in a given ITS station unit, these applications are typically engaged in
several data exchanges of distinct nature (different flow types). There could consequently exist multiple
ongoing data flows of different natures, competing for the same ITS station resources.
5.3 ITS-S communication profiles
In general, an ITS station supports multiple protocols and functionalities (ITS-S capabilities) within
each of the ITS station layers: in the ITS-S facilities layer (e.g. the communication handler specified
[24] [25]
in ISO 17423:2018, ITS-S application processes for CAM and DENM ,…), various types of ITS-S
[8] [21] [26]
networking and transport layer protocols (IPv6 , FNTP , GeoNetworking ,…) and various types
[14]
and instances of access technologies (communication interfaces ).
Available protocols and access technologies can be combined in various ways to transfer data to
the destination. A collection of protocols used to transfer data to a destination is referred to as the
communication profile (ITS-SCP).
The communication profile indicates the protocol stack, i.e. the protocols at the ITS station facilities
layer, the ITS station networking and transport layer, and ITS station access technologies layer that are
used for a given data flow.
Several communication profiles could exist to reach a given destination. Some communication profiles
may not be appropriate to reach a given destination if the communication end points do not support a
compatible set of protocols.
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5.4 ITS-S paths
An ITS-S path as defined in ISO 21217:2014 starts at its source node and ends up at a destination node.
There may be zero or more intermediate nodes in the ITS-S path between the source node and the
destination node.
However, the ITS-S path towards a destination node goes through “selectable communication nodes”
that are pre-determined according to the peer nodes engaged in the communication. These “selectable
communication nodes” are referred to as the ‘ITS-S anchor nodes’ (respectively the ‘ITS-S ingress anchor
node’ and the ‘ITS-S egress anchor node’) and form the entry and exit end points of a controllable path
segment (‘ITS-S anchor segment’). This is illustrated in Figure 2.
NOTE 1 The CI, the ITS-S ingress anchor node and the ITS-S egress anchor node are the selectable parts
of the path. The CI is the starting point of the ITS-S path. The ITS-S ingress anchor node is the first selectable
communication node on the path to which the packets are forwarded, whereas the egress ITS-S anchor is the last
selectable communication node.
NOTE 2 For groupcast communication, there are multiple destinations but the packets transmitted to a group
are not duplicated before reaching the ITS-S egress anchor node, hence all destination nodes are said to be
reachable over the same path. The ITS-S egress anchor node can play the role of a rendez-vous point for IP-based
multicast communications.
Figure 2 — Overview of the concept of ITS-S path and ITS-S anchor segment
In some circumstances, for example when the source node and the destination node are both located
in the same local network (see ITS-S path 3 in Figure 2), the ingress and ITS-S egress anchor nodes are
collapsed with the destination node.
— For Internet-based communications (see ITS-S path 1 and 2 in Figure 2), an ITS-S path goes through
a communication interface (CI) of the source ITS-S. The ITS-S ingress anchor node is a node in the
access network to which the ITS station is locally attached, and the ITS-S egress anchor node is a node
in the Internet to which the ITS station is remotely attached. It finally reaches its destination node.
— For local ad hoc communications (see ITS-S path 3 in Figure 2), an ITS-S path goes through a CI of
the source ITS-S. The ingress anchor, egress anchor and the destination node are identical.
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The diversity of communication interfaces and ITS-S anchor nodes imply a multiplicity of ITS-S paths
may be available to reach a given destination node. This happens:
— When multiple ITS-S ingress anchor nodes are reachable through the same communication
interface, each of them typically located in the access network of distinct operators or located in
different parts of the network when communication traffic is discriminated between road safety,
traffic efficiency and infotainment types of services, or when multiple ITS-S ingress anchor nodes
are reachable through distinct communication interfaces. Note that ITS-S ingress anchor nodes
could be significantly distant in the topology of the communication network (e.g. the ITS-S ingress
anchor node on an ITS-S path going through an 11p communication interface of a vehicle ITS station
is likely on the roadside infrastructure whereas the ITS-S ingress anchor node on an ITS-S path
going through the 3G communication interface is in the network
...