28 PART | I ITS technology enablers
Both standards were developed under EC Mandate 453, define the mes-
sage sets that can be used in safety-critical applications of cooperative ITS and
incorporate the findings from the past interoperability testing workshops (Plug-
tests) that ETSI has organized. The Cooperative Awareness Service, described
in EN 392, assumes information exchange between road users (cars of all types,
bicycles, motorcycles, and pedestrians) and the infrastructure (road signs, traf-
fic lights, and barriers), which includes position and movement data, as well
as identification and other properties, and achieves increased awareness among
participating nodes. EN 302 637-2 specifies the message (Cooperative Aware-
ness Message) syntax and semantics and defines how messages are handled. EN
302 637-3 defines the Decentralized Environmental Notification (DEN) Basic
Service for sending warnings in the case of road hazards. The respective warning
message (DENM) contains information about the road or traffic conditions and
in a typical, ITS scenario is sent from an ITS station to all surrounding vehicles
using V2I communications. All vehicles that receive the message, process it and
present relevant information to the driver who can take an informed decision.
2.10 Conclusions
It is evident from the current technological status of automotive communica-
tions, that short-range communication is used to complement traditional wifi
technology and provide device communication of various granularity, ranging
from intravehicle transmissions to interaction with other vehicles and the infra-
structure. The need for common and standardized technologies and protocols
for data communication is clear and when achieved is expected to boost interop-
erability and allow the successful deployment of large-scale ITS applications
that support the ad-hoc connectivity of vehicles and other mobile devices.
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