Information Technology Reference
In-Depth Information
Fig. 1. Feasible average speed as a function of the trac density
3
Event Modelling and Processing
The system receives as input a series of simple events generated by the vehicles.
These events include the vehicle identifier, its position, velocity and maneuver,
as described in previous Section.
These simple events, along with those coming from the infrastructure such
as trac cameras, meteorological stations, etc. are sent to the nearest base sta-
tion that will perform a primary processing and send its gathered outputs to
a trac center, where complete processing is realized thanks to the informa-
tion collected from the associated different geographical areas. At this level, it
is possible to make decisions regarding trac redistribution in a mandatory or
voluntary manner, or send trac patrols.
Fig. 2 shows the event flow among these entities and the actions which close
the loop.
3.1 Event Processing
CEP technology can be applied to several ITS related fields. In this work it is
exploited to raise the situation awareness in vehicle networks, processing events
in base stations and trac centers, and entering the feedback into the system.
A situation can be defined as a state of a set of entities at some particular
time. It could be a vector of values of attributes belonging to one entity of
multiple entities. It can be also described by means of the relations between one
or multiple entities at some particular time. A simple event could be described by
one entity, where one attribute, for example its velocity, changes forming a series
Search WWH ::




Custom Search