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SAE J2735-Draft-Rev15 [issued: 01-30-07]
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16 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
STA
Station
TC
Traction Control
TCIP
Transit Communications Interface Profiles
TCP
Transmission Control Protocol
TCS
Traction Control System
TMDD
Traffic Management Data Dictionary
UDP
User Datagram Protocol
UN
United Nations
UTC
Universal Coordinated Time (before you ask, see
WAVE
Wireless Access in Vehicular Environments
WME
WAVE Management Entity
WSIE
WAVE Service Information Element
WSM
WAVE Short Message
WSMP
WSM Protocol
XML
eXtensible Markup Language
4
THE USE OF DSRC MESSAGES IN APPLICATIONS
This section contains introductory material about this edition of the DSRC standard, background information on the
rationale for the standard, and an introduction to the messages, which follow in Sections 5 to Section 9.
4.1
Introduction to DSRC Goals and Objectives
Public sector organizations throughout the world have identified the need to reduce fatalities and serious injuries
that result from vehicle crashes, as well as the need to reduce traffic congestion. The use of wireless and computer
technologies in vehicles, and on the roadway infrastructure, have been identified as promising areas to provide
solutions for these needs. Intelligent Transportation System (ITS) planning in many regions of the world has
therefore become focused on supporting applications that utilize a common platform to address three priorities:
1)
Safety
2)
Mobility
3)
Commercial (or Private)
Safety applications, in particular, must be interoperable between vehicles from different manufacturers and between
vehicles and roadway infrastructure within all the areas where the vehicle is likely to travel. This requirement for
interoperability is also relevant to contemplated mobility applications. This SAE Standard specifies initial
representative standard message sets, data frames and data elements that allow interoperability at the application
layer without the need to standardize applications. This approach supports innovation and product differentiation
through the use of proprietary applications, while maintaining interoperability by providing standard message sets
that can be universally generated and recognized by these proprietary applications.
The message sets specified in this SAE Standard depend upon the lower layers of the DSRC protocol stack to
deliver the messages from applications at one end of the communication system (for example, in a vehicle) and the
other end (for example, in another vehicle). These lower layers of the DSRC protocol stack are defined and
specified in standards developed by other Standards Development Organizations (SDOs). In particular, the lower
layers are addressed by IEEE P802.11p, and the upper layer protocols are covered in the IEEE P1609 series of
standards. The DSRC family of standards developed by the various SDOs are meant to operate together in a