ISO 25111:2009
(Main)Intelligent transport systems — Communications access for land mobiles (CALM) — General requirements for using public networks
Intelligent transport systems — Communications access for land mobiles (CALM) — General requirements for using public networks
ISO 25111:2009 specifies general requirements for the provision of ITS services, using the CALM architecture and protocols, via the use of public wireless networks [including cellular telephony and mobile wireless broadband (MWB) systems]. In particular, ISO 25111:2009 specifies protocols and parameters that public wireless networks shall include to support prolonged 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, and such handover is provided by the public wireless network. The requirements for the use of CALM via public wireless networks where there is no provision for heterogeneous cell/cell handover (i.e. so-called nomadic services) is not the central focus of ISO 25111:2009, but general requirements to enable the use of such systems, within the limits of the range of a single cell, are also provided. Wherever practicable, ISO 25111:2009 has been developed by reference to suitable extant standards, adopted by selection. Required regional variations are provided. Specifically, for ISO 25111:2009, extant national and International Standards for public wireless networks are adopted by reference and are not redefined herein. Application-specific upper layers are not included in ISO 25111:2009, but will be driven by application standards (which might not be technology specific).
Systèmes intelligents de transport — Accès aux communications des services mobiles terrestres (CALM) — Exigences générales pour l'usage des réseaux publics
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 25111
First edition
2009-11-15
Intelligent transport systems —
Communications access for land mobiles
(CALM) — General requirements for
using public networks
Systèmes intelligents de transport — Accès aux communications des
services mobiles terrestres (CALM) — Exigences générales pour
l'usage des réseaux publics
Reference number
©
ISO 2009
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ii © ISO 2009 – All rights reserved
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Conformance .1
3 Normative references.2
4 Terms and definitions .2
5 Abbreviated terms.4
6 Requirements.4
7 Medium access control (MAC) .9
8 Service access point (SAP) .9
9 CALM public wireless network manager .10
10 Test and conformance requirements .10
11 Marking, labelling and packaging.10
12 Declaration of patents and intellectual property.11
Annex A (normative) System overview, sequence and state diagrams.12
Bibliography.17
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 25111 was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.
iv © ISO 2009 – 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 a set of air interface definitions
for wireless communications using a number of mobile (i.e. with horizontal or vertical cell/cell handover)
wireless media, including cellular 2nd generation, cellular 3rd generation, 5 GHz, millimetre wave, infrared
communications, and mobile wireless broadband (MWB), over packet-based networks. The CALM
architecture is also designed to include short-range, short-duration, low-latency communication systems such
as European dedicated short-range communications (DSRC) and North American wireless access in vehicular
environments (WAVE) based on IEEE 802.11. It is anticipated that other air interfaces will be added in the
future. Generally speaking, the CALM architecture is designed to include air interfaces that provide some
subset of point-to-point, vehicle-to-vehicle and vehicle-to-point communications over packet-based networks
in the ITS sector. In particular, this Standard provides general specifications for air interfaces designed to
provide mobile access to packet-based networks.
The requirements for transmission of information over large distances using wireless technology are
functionally very different from the requirements for European DSRC. Large volumes of data are required for
purposes such as safety, traffic information and management, video downloads to vehicles for tourist
information and entertainment, and navigation system updates. In order to support such services, mobile units
need to be able to communicate over longer ranges with access points/base stations, and the system must be
able to hand over sessions from one access point/base station to another (horizontal or vertical). CALM
standards are explicitly designed to enable quasi-continuous data communications as well as data
communications of protracted duration between vehicles and service providers, and between vehicles. It is
important to note that the CALM architecture is specifically designed to support packet-based
communications; support for circuit-switched communications is not included.
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 that
can be included in a CALM system. 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 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 for internet
connectivity International Standard (ISO 21210), the CALM medium service access points International
Standard (ISO 21218) and the CALM communication and 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.
ITS applications that can be enhanced or are enabled by the CALM architecture include car-to-car and point-
to-multipoint safety messaging, collision avoidance, update of roadside telemetry and messaging, probe data
collection, general internet access, image and video transfer, infotainment, multimedia multicast, traffic
management, monitoring and enforcement in mobile situations, and route guidance, just to mention a few.
INTERNATIONAL STANDARD ISO 25111:2009(E)
Intelligent transport systems — Communications access for
land mobiles (CALM) — General requirements for using public
networks
1 Scope
This International Standard specifies general requirements for the provision of ITS services, using the CALM
architecture and protocols, via the use of public wireless networks [including cellular telephony and mobile
wireless broadband (MWB) systems].
In particular, this International Standard specifies protocols and parameters that public wireless networks shall
include to support prolonged 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, and such handover is provided by the public wireless network.
The requirements for the use of CALM via public wireless networks where there is no provision for
heterogeneous cell/cell handover (i.e. so-called nomadic services) is not the central focus of this International
Standard, but general requirements to enable the use of such systems, within the limits of the range of a
single cell, are also provided.
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 national and International Standards for public wireless
networks are adopted by reference and are not redefined herein.
Application-specific upper layers are not included in this International Standard, but will be driven by
application standards (which might not be technology specific).
2 Conformance
In order to claim conformance with this International Standard, communication shall be established in full
compliance with procedures and protocols for the appropriate public wireless networks standards, and shall
comply with the requirements of
⎯ ISO 21210 (CALM IPv6 networking),
⎯ ISO 21217 (CALM system architecture),
⎯ ISO 21218 (CALM medium service access points), and
⎯ ISO 24102 (CALM management).
Local area public wireless networks that support nomadic wireless systems, without cell/cell handover, cannot
claim compliance with this International Standard.
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) — IPv6
Networking
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
ISO 24102, Intelligent transport systems — Communications access for land mobiles (CALM) — Management
4 Terms and definitions
1)
For the purposes of this document, the following terms and definitions apply.
4.1
broadband
characteristic of systems that support information transmission rates greater than the primary rate (4.12)
NOTE The definition given here is consistent with that given in ITU-R F.1399.
4.2
CALM application session
association of two or more parties for the provision of CALM application service and which, until its
termination, can involve more than one communication session in order to exchange information (i.e. are involved
in a transaction)
NOTE 1 A CALM application session is not possible unless a communication session (4.4) is first established.
NOTE 2 An application session will normally involve multiple bidirectional transfers of data, but can be a unidirectional
transfer of data.
4.3
cell
communication zone/service area of a wireless access point (AP) or base station
4.4
communication session
association of two or more wireless communication devices between which a functional wireless
communication link is available for mutual exchange of data/information
NOTE Application sessions (see 4.2) engage in and complete transactions using communication sessions.
4.5
fixed wireless broadband system
wireless broadband system including communication between user terminals and wireless access points in
which the locations of the user terminals and the wireless access points are stationary
NOTE The definition given here is consistent with that given in ITU-R F.1399.
1) Reference should also be made to ISO 21217.
2 © ISO 2009 – All rights reserved
4.6
handover
process of switching a communications transaction in progress from one communication cell to another or
between radio channels in the same cell
NOTE Handover is used to allow established sessions to continue when mobile stations move from one cell/AP to
another a
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