Cross-cutting Issues

The wireless local area network (WLAN) was originally conceived to address the indoor
enterprise market.  As prices decreased and technology improved, WLAN moved into many
other areas including the home, public hotspots, municipal access, and public safety.  This
paper documents the results of a WLAN deployment that occurred at one of the busiest
intersections in the northwest suburbs of Detroit.  The goal of the deployment was to provide
802.11b wireless coverage to permit vehicle probe data collection.  Specific measurement
data relating to the RF environment is included.  For comparison purposes, data is also
provided that was recorded at a nearby intersection.  This information may be applied to any
application in which WLAN will be used in an outdoor environment.

Motorola

Presented at the 15th World Congress on Intelligent Transport Systems, November 16-20, 2008, New York, New York

It does not take a clairvoyant to predict the role and importance that web services will
have in intelligent transportation systems (ITS).  The question that is in everyone's mind
is how will it fit into the framework already established by the many standards and
working groups?  This paper examines one web service aspect that is compatible with the
current ITS framework and is foundational to its future development.  That one aspect is
discovery, which is the publishing and finding of resources over a wide-area network.  
Generally speaking, a discovery system requires a namespace that adequately defines its
domain.  Therefore, an ITS discovery system needs an ITS namespace based upon a well
known and accepted taxonomy in the transportation industry.   The obvious fit for the ITS
namespace is the taxonomy defined by the National ITS Architecture.  By mapping this
taxonomy into a discovery system, transportation can take an easy but vital stride in
defining standards for center-to-center (C2C) web services.  This is especially important
for emerging C2C applications, because a common discovery system will facilitate the
future networking of transportation regions. The C2C working group has already taken an
important first step by defining a naming convention to uniquely identify centers and
resources within the United States (NTCIP 1104).  Without much effort, the ITS
namespace can provide a valuable extension to this convention through the specification
of the ITS discovery service.  In other words, ITS discovery is a web service that uses the
C2C naming and the National ITS Architecture taxonomy for the definition and
discovery of centers and their shared resources.  This paper begins by comparing three
parts of business-to-business (B2B) activities with and center-to-center (C2C) activities.  
Of the three parts, discovery is shown to be key.  The B2B industry is in the process of
adopting a standard discovery web service, called the Universal Description, Discovery,
and Integration (UDDI) service.  Likewise in California, the San Diego region is
developing a so-called Center Description, Discovery, and Integration (CDDI) service.  
There are five steps for adapting B2B UDDI service for use with C2C CDDI service.  
CDDI data structures are discussed and the paper concludes by showing how centers
would use CDDI.  This approach is under development in San Diego's Intermodal
Transportation Management System (IMTMS) and may become the regional standard.  
At the National level, the CDDI and its associated center object designs have not yet been
presented to the center-to-center working group, mainly because of development delays
and overloaded agendas.

National Engineering Technology (NET)

Presented at the ITS America Annual Conference and Exposition, April 26 - 28, 2004 San Antonio, Texas