ISO 15628:2013

INTERNATIONAL ISO
STANDARD 15628
Second edition
2013-11-01
Intelligent transport systems —
Dedicated short range communication
(DSRC) — DSRC application layer
Systèmes intelligents de transport — Communications spécialisées à
courte portée (DSRC) — Couche d’application DSRC
Reference number
©
ISO 2013
© ISO 2013
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ii © ISO 2013 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Abbreviations. 4
5 Structure of the application layer core . 6
6 Transfer kernel . 7
6.1 General . 7
6.2 Services . 8
7 Initialisation kernel .21
7.1 General .21
7.2 Services .21
7.3 Behaviour .24
8 Broadcast kernel .27
8.1 General .27
8.2 Services .27
8.3 Behaviour .28
9 Extensibility for different lower layer services and application interfaces .29
9.1 General .29
9.2 Extended definitions .30
Annex A (normative) Data structures .34
Annex B (normative) Naming and registration .40
Annex C (informative) Example of coding .41
Annex D (normative) Declaration of application layer features supported .44
Annex E (informative) Lower layer services .45
Bibliography .49
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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to Trade (TBT) see the following URL: Foreword - Supplementary information
ISO 15628 was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.
This second edition cancels and replaces the first edition (ISO 15628:2007), which has been
technically revised.
iv © ISO 2013 – All rights reserved

Introduction
The communication requirements of many ITS applications can be fulfilled by DSRC. The DSRC International
Standards enable compliant communication systems to serve multiple ITS applications in parallel.
The small service areas and severe real-time constraints require a specific protocol architecture leading
to the reduced protocol stack shown in Figure 1, built up by the “application layer”, the “data link layer”
and the “physical layer”. Such architecture is very common for real-time environments.
This International Standard gives the architecture and services offered by the DSRC application layer.
Figure 1 — DSRC protocol stack
This International Standard contains, besides the normative main body, three normative annexes: “Data
structures”, “Naming and registration”, “Declaration of application layer features supported”; plus two
informative annexes: “Example of coding” and “Lower layer services”.
INTERNATIONAL STANDARD ISO 15628:2013(E)
Intelligent transport systems — Dedicated short range
communication (DSRC) — DSRC application layer
1 Scope
This International Standard specifies the application layer core which provides communication tools
for applications based on DSRC. These tools consist of kernels that can be used by application processes
via service primitives. The application processes, including application data and application-specific
functions, are outside the scope of this International Standard.
This International Standard is named “application layer”, although it does not cover all functionality of
OSI Layer 7 and it includes functionality from lower layers.
It uses services provided by DSRC data link layer, and covers functionality of intermediate layers of the
“OSI Basic Reference Model” (ISO/IEC 7498-1).
Figure 2 illustrates the global data flow between the parts of the DSRC stack (physical, data link and
application layers) and the application.
NOTE For definitions of the terms used in Figure 2, see ISO/IEC 7498-1.
Figure 2 — Architecture and data flow of the DSRC stack
The following subjects are covered by this International Standard:
— application layer structure and framework;
— services to enable data transfer and remote operations;
— application multiplexing procedure;
— fragmentation procedure;
— concatenation and chaining procedures;
— common encoding rules to translate data from abstract syntax ASN.1 (ISO/IEC 8824-1) into transfer
syntax (ISO/IEC 8825-2:2008) and vice versa;
— communication initialisation and release procedures;
— broadcast service support;
— DSRC management support including communication profile handling; and
— extensibility for different lower layer services and application interfaces.
It is outside the scope of this International Standard to define a security policy. Some transport
mechanisms for security-related data are provided.
NOTE No implementation of the “broadcast pool” functionality has become known. “Broadcast pool”
functionality is therefore considered untested.
2 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/IEC 8825-2:2008, Information technology — ASN.1 encoding rules: Specification of Packed
Encoding Rules (PER)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
application
user of the services offered by the DSRC communication stack
3.2
attribute
value, which may have a structure, consisting of a set or sequence of data elements
Note 1 to entry: The value of an “attribute” can be observed or modified by sending a request to GET (read) or SET
(write) the value.
3.3
attribute identifier
identifier which unambiguously distinguishes an attribute from all other attributes within the same element
3.4
beacon service table
data structure transmitted by the RSU indicating available services
3.5
broadcast pool
data structure broadcast from the RSU to the OBUs
3.6
chaining
function performed by the transfer kernel to link the execution of service primitives
2 © ISO 2013 – All rights reserved

3.7
concatenation
function performed by the transfer kernel to map multiple T-APDU fragments into one data link layer
service data unit
Note 1 to entry: The inverse function is called separation or deconcatenation.
3.8
element
coherent set of data and functionality
Note 1 to entry: Application elements are created by the applications and are addressed using element identifiers.
3.9
element identifier
identifier which unambiguously distinguishes an element from all other elements residing in the same OBU
3.10
fragmentation
function performed by the transfer kernel to map one ASDU on multiple LSDUs
Note 1 to entry: In ISO/IEC 7498-1, fragmentation is called segmentation.
Note 2 to entry: The inverse function is called defragmentation or, in ISO/IEC 7498-1, disassembling.
3.11
head of the line
queuing discipline (also referred to as strict or fixed priority queuing), where a number of queues are
served in priority order
Note 1 to entry: A lower priority queue is served if all higher priority queues are empty, each queue is served in
“first come, first served” order, and each user goes to the head of the line of the users of lower priorities but behind
all users of equal or higher priority.
3.12
management
provides and distributes values for the communication parameters for controlling the DSRC
communication stack
3.13
multiplexing
function within the transfer kernel allowing simultaneous support for more than one application in a
single OBU
3.14
operation
abstract representation of behav
...