Concept of Operations and Requirements
The (Draft) AZTech Center-to-Center Specification has been developed through the consensus
input of regional stakeholders. Following a Systems Engineering Methodology, a user needs
assessment and concept of operations (ConOps) were developed. Based on the ConOps system
functional requirements and a regional stakeholder agreement were then developed. The
figure below shows the application of the 'VEE' model to the AZTech C2C project.
The system functional requirements for DMS (Dynamic Message Signs) and TMS (Traffic Management Systems)
are the basis for development of the technical specifications for information exchange among
centers in the region.
Requirements Analysis and Design
Stepping from problem (requirements) to solution (design) the requirements
traceability matrix (RTM) documents how the analysis of requirements translates to the
project-specific design of center interfaces, from which in future steps technical specifications
will be developed. This concept is illustrated in the figure below.
Currently, this web site provides an navigable hyperlinked model of the RTM and project-specific
message set including dialogs, messages, and data elements. The project-specific message set is based on
the ITE/AASHTO Message Set Standard for Traffic Management Center-to-Center Communications (TMDD).
Center-to-Center System Interface Specifications
The technical specification is based on stakeholder input and review of the requirments analysis and design
presented herein at a stakeholder workshop held on June 14, 2006. The final specification in PDF format, and WSDL and
XML schema are available from the links at left. The WSDL and XML Schema files were validated using XML Spy.
A security white paper has also been developed to address web services SOAP Message security based on the OASIS standard.