ISO 29282:2011

INTERNATIONAL ISO
STANDARD 29282
First edition
2011-07-15
Intelligent transport systems —
Communications access for land mobiles
(CALM) — Satellite networks
Systèmes intelligents de transport — Accès aux communications des
services mobiles terrestres (CALM) — Applications utilisant les réseaux
satellitaires
Reference number
©
ISO 2011
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ii © ISO 2011 – 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 Background . 3
6.1 Proprietary connectivity protocols . 3
6.2 Internet connectivity . 5
7 Requirements . 5
7.1 General . 5
7.2 Adoption of satellite standards and internationally adopted practices . 6
7.3 CALM architecture and application grouping. 6
7.4 CALM networking protocols . 6
7.5 CALM medium service access points . 6
7.6 CALM “ITS station management” . 6
7.7 CALM using public wireless networks . 7
7.8 Establishment and termination of medium specific sessions . 7
7.9 Interface medium management . 7
8 Medium access control (MAC) . 7
8.1 Conformance . 7
8.2 CALM satellite communications MMAE service primitives . 7
8.3 Satellite communication MMAE . 8
8.4 CALM session connection .10
8.5 CALM session disconnection .10
8.6 Change of satellite communications connection state .10
8.7 Retrieval of medium status . 11
8.8 Satellite communications specific connection aspects . 11
8.9 Satellite communications session disconnection .12
9 Test and conformance requirements .12
10 Declaration of patents and intellectual property .12
Bibliography .13
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 29282 was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.
iv © ISO 2011 – All rights reserved

Introduction
This International Standard is part of a family of International Standards based on the communications
access for land mobiles (CALM) concept. These International Standards specify a common architecture,
network protocols and communication interface definitions for wireless communications using various access
technologies including cellular 2nd generation, cellular 3rd generation, satellite, infra-red, 5 GHz microwave,
60 GHz millimetre-wave and mobile wireless broadband. These and other access technologies that can be
incorporated are designed to provide broadcast, unicast and multicast communications between mobile stations,
between mobile and fixed stations and between fixed stations in the intelligent transport systems (ITS) sector.
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 or vertical handover, between the various
media supported by CALM (e.g. cellular, microwave, mobile wireless broadband, infra-red, DSRC, and satellite).
The CALM concept supports selection policies that include user preferences and media capabilities in making
decisions as to which medium to use for a particular session, and when to hand over 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 IPv6 networking protocols International Standard,
ISO 21210, the CALM medium service access points International Standard, ISO 21218, and the CALM station
management 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.
Satellite communications provide very broad coverage and are particularly useful in areas where there is no
terrestrial wireless communications coverage, or when such systems are overloaded or have poor coverage.
As satellite systems evolve, these systems may provide an alternative communication route in many situations.
CALM station management will be able to ensure that the most appropriate network, of those available, will
be used to improve ITS availability and reliability at the minimum cost. Example applications include urgent
emergency messages such as eMessage or eCall, where an eCall over cellular radio may not be possible at
the site of an accident, because of lack of cellular coverage.
Satellite communications systems will also be able to provide infill coverage where the deployment of the

CALM M5 infrastructure set out in ISO 21215 is incomplete. Furthermore, satellite communications that support
IPv6 broadcast mode will also support the geo-networking protocols that are currently being developed and
standardized.
Additionally, satellite systems may be installed at ITS stations primarily because of the broadcast and paging
services that they can deliver to support applications and the management of connections. The interface for
broadcast satellite communications is defined in ISO 13183, using a protocol which is common to all of the
broadcast media.
INTERNATIONAL STANDARD ISO 29282:2011(E)
Intelligent transport systems — Communications access for
land mobiles (CALM) — Satellite networks
1 Scope
This International Standard provides definitions and procedures for the establishment, maintenance and
termination of an ITS (intelligent transport systems) communications session within a CALM (communication
access for land mobiles) system environment using bi-directional satellite communications.
It defines the operation of the medium management adaptation entity (MMAE), which provides the management
interface between a proprietary satellite communications medium and the “ITS station management”. This
enables the “ITS station management” to know the status of the communications medium and control the interface
without the need for applications at the ITS station to have any knowledge of the satellite communications
interface. The procedures that the “ITS station management” expects to use are also explained.
NOTE 1 CALM links are required for quasi-continuous, prolonged and short-duration communications between
vehicles and the roadside, between vehicles, and between mobile equipment and fixed infrastructure points, over medium
and long ranges.
This International Standard defines how to connect and disconnect a communication session using satellite
communication systems in the context of an application operated within the environment defined in ISO 21217.
It supports peer-to-peer modes of communication. Support for broadcast satellite systems is defined in
ISO 13183, which provides a common approach for all broadcast media. It supports satellite communications
networks that are interconnected with the public network, as well as those which connect via the internet and
those which provide a stand-alone capability.
NOTE 2 As there are multiple instantiations of satellite systems, most of which are not interoperable, there is the
possibility of several simultaneous satellite sessions, each forming a separate CALM medium (although the differences
may only be in software within the on-board equipment).
Wherever practicable, this International Standard has been developed by reference to suitable existing
standards, adopted by selection. Application-specific upper layers are not included, but will be driven by
application standards (which may not be technology-specific).
2 Conformance
In order to conform with this International Standard, communications using satellite communications protocols
shall be established in full compliance with local telecommunications procedures and protocols and shall
comply with the requirements of ISO 21210, ISO 21217, ISO 21218, ISO 24102 and ISO 25111. See Clause 3.
NOTE 1 ITU-T standards for satellites mostly relate to traditional telecommunications services such as voice, X21
and X25. In general, satellite services are delivered as closed proprietary solutions with standardized external interfaces,
including ITU-T V.24 (EIA-232/RS-232), ITU-T V.11 (EIA-422/RS-422), ITU-T V.35 (EIA-449/RS-449), EIA-530/RS-530,
ITU-T X-21 and EIA-423/RS-423. Such systems are not recommended for integration into ITS because of the need to
provide adaptation to support IP communications.
NOTE 2 IPv6 systems are now being developed but have not yet been standardized. This interface International
Standard has been developed to be consistent with these emerging new services.
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 an
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