ISO 21213:2008

INTERNATIONAL ISO
STANDARD 21213
First edition
2008-11-01
Intelligent transport systems —
Communications access for land mobiles
(CALM) — 3G Cellular systems
Systèmes de transport intelligents — Accès de communication pour
services mobiles terrestres (CALM) — Systèmes cellulaires 3G

Reference number
©
ISO 2008
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©  ISO 2008
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ii © ISO 2008 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Conformance. 1
3 Normative references . 1
4 Terms and definitions. 2
5 Abbreviated terms . 2
6 Requirements . 2
6.1 Adoption of other standards and internationally adopted practices . 2
6.2 Non packet-switching cellular networks . 3
6.3 CALM architecture. 3
6.4 CALM networking protocols. 3
6.5 CALM service access points . 3
6.6 CALM interface manager . 3
6.7 CALM using public wireless networks . 3
6.8 Establishment of a medium specific session . 3
6.9 Interface medium management. 4
7 Medium access control (MAC) . 4
7.1 CALM 3G cellular communications MMAE service primitives. 4
7.2 CALM 3G cellular communications MMAE functionality. 6
8 Test and conformance requirements. 6
9 Marking, labelling and packaging . 6
10 Declaration of patents and intellectual property. 6
Bibliography . 8

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 committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 21213 was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.

iv © ISO 2008 – All rights reserved

Introduction
This International Standard is part of a family of International Standards for communications access for land
mobiles (CALM) which specify a common architecture, network protocols and communications interface
definitions for wireless communications using different bearer technologies, e.g. second and third generation
cellular, 5 GHz microwave, 60 GHz millimetre-wave, mobile wireless broadband, and Infra-red
communications. Other air interfaces may be added at a later date. These wireless communications interfaces
are designed to provide parameters and protocols for broadcast, point-point, vehicle-vehicle, and vehicle-point
communications in the ITS Sector.
This International Standard determines the air interface parameters for CALM communications via 3G cellular
networks.
CALM standards are explicitly designed to enable quasi-continuous communications as well as
communications of protracted duration between vehicles and service providers, and between vehicles.
The fundamental advantage of the CALM concept over traditional systems is the ability to support media
independent handover (MIH), also referred to as heterogeneous handover, between the various media
supported by CALM (e.g., cellular, microwave, mobile wireless broadband, infra-red, DSRC). Selection
policies are supported that include user preferences and media capabilities in making decisions as to which
media to use for a particular session, and when to handover between media or between service providers on
the same medium. These handover mechanisms are defined within the CALM architecture International
Standard (ISO 21217), the CALM networking protocols International Standard (ISO 21210), the CALM
medium service access points International Standard (ISO 21218) and the CALM interface manager
International Standard (ISO 24102). Handovers between access points using the same technology and
service provider use mechanisms that are defined within the particular medium specific CALM Standard.
ITS applications include the update of roadside telemetry and messaging, internet, image and video transfer,
infotainment, multimedia multicast, traffic management, monitoring and enforcement in mobile situations,
route guidance, car-to-car and point-to-multipoint safety messaging, maintenance management, and “yellow
page” services among others.
This International Standard provides definitions and procedures for the establishment and maintenance of an
ITS communications session within a CALM system environment using 3G cellular communications.

INTERNATIONAL STANDARD ISO 21213:2008(E)

Intelligent transport systems — Communications access for
land mobiles (CALM) — 3G Cellular systems
1 Scope
This International Standard determines the air interface options applicable to CALM using third generation
(3G) cellular networks. In particular, this International Standard specifies protocols and parameters that 3G
systems shall include to support prolonged, long-range, high data rate wireless communication links in ITS
environments where heterogeneous handovers or media independent handovers (MIH) are either necessary
to maintain the link, or desirable, as determined by media selection policies.
This International Standard provides protocols and parameters for long range, medium speed wireless
communications in the ITS sector using third generation cellular communications.
Wherever practicable, this International Standard has been developed by reference to suitable extant
Standards, adopted by selection. Required regional variations are provided.
Specifically, for this International Standard, extant 3G systems, as defined by various international and
national Standards, are adopted by reference.
Application specific upper layers are not included in this Standard, but will be driven by application standards
(which may not be technology specific).
2 Conformance
In order to claim conformance with this International Standard, cellular communication shall be established in
full compliance with local telecommunications procedures and protocols for the appropriate 3G standards, and
shall comply with the requirements of ISO 21217 (CALM System architecture), ISO 21210 (CALM Networking
protocols), ISO 21218 (CALM medium service access points), and CALM interface manager (ISO 24102).
3 Normative references
The following referenced documents are indispensable for the application 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 21210, Intelligent transport systems — Communications access for land mobiles (CALM) — Networking
Protocols
ISO 21217, Intelligent transport systems — Communications access for land mobiles (CALM) — Architecture
ISO 21218, Intelligent transport systems — Communications access for land mobiles (CALM) — Medium
service access points
ANSI/TIA-136-A, Mobile Station-Base Station Compatibility Standard for Wideband Spread Spectrum Cellular
Systems
TIA/EIA/IS-54-C, Cellular System Dual-Mode Mobile Station-Base Station Compatibility Standard
3GPP/3GPP2, 3GPP/3GPP2 Standards as they relate to 2G/2.5G
4 Terms and definitions
For the purposes of this document, the terms and definitons given in ISO 21217 apply.
5 Abbreviated terms
Abbreviated terms used in this document are listed below. Reference should also be made to ISO 14817.
CALM communications access for land mobiles
CDMA code division multiple access
Cdma2000 code division multiple access 2000
DSRC dedicated short range communication
GSM global system for mobile communications
MMAE media management adaption entity
TDD time division duplex
TIA telecommunications industry association
UMTS universal mobile telecommunications system
ULTRA UMTS terrestrial radio access
W-CDMA wideband code division multiple access
3GPP third generation partnership project
3GPP2 third generation partnership project two
6 Requirements
6.1 Adoption of other standards and internationally adopted practices
Equipment and systems complying to this International Standard shall operate in the environment of, and to
the parameters defined for, 3G systems in one of the following sets of Standards and Internationally adopted
practices:
⎯ 3GPP Active specifications
⎯ 3GPP2 Active specifications
⎯ GSM-MAP
⎯ W-CDMA
⎯ cdma2000
⎯ ANSI/TIA-41
⎯ ULTRA-TDD
⎯ ANSI/TIA-136.
2 © ISO 2008 – All rights reserved

The equipment and systems shall operate within the limits and parameters defined in regional and national
regulations.
6.2 Non packet-switching cellular networks
Non packet-switched cellular networks shall not be used for CALM communication sessions, except to
transmit non time-critical emergency messages from the vehicle to predetermined numbers or assistance
centres.
NOTE “Non time critical” in this context does not imply that it is not important to transmit the message as quickly as
possible, but implies that the time taken to establish communication with the target number is non time critical and can
follow predetermined dial up protocols according to normal dialling procedures.
6.3 CALM architecture
Equipment and systems complying to this International Standard shall operate in the environment of, and to
the parameters defined within, ISO 21217.
6.4 CALM networking protocols
Equipment and systems complying to this International Standard shall operate in the environment of, and to
the parameters defined within, ISO 21210.
6.5 CALM service access points
Equipment and systems
...