Navigation Service Provider Architecture

Scalability and reliability are enhanced by separation or disaggregation of functionality into groups that respond in a similar way to specific aspects of the imposed request loading. For example, moving core navigational computations into a subsystem allows tight coupling with the world model used in those computations and enables the computational resources required to meet the needs of the end user applications to be adjusted to precisely meet the peak and average load. The following sections show how to divide NSP functionality into four subsystems. Each can be implemented on separately scalable servers or server clusters depending on the scale of the operation. It is also possible to combine adjacent subsystems in a single server in small systems. The case where all subsystems are co-located on a single server is distinguished as the "Space Publishing Server." The Space Publishing Server is typically delivered by a system integrator to the owner of a parking structure, office building, airport or other small space as an aid to people moving within that structure. In that case the NSP functions are a means of "publishing" the mobile space in a way that network applications may access directly for travel planning, guidance, and display purposes.

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