The physical architecture is the layer of architecture closest to the real world in the transportation system architecture system. As a carrier of the transformation of the transportation system from functional and logical architecture to real-world transportation entities, it is the specific realization of the logical semantics of the transportation system and also guides the transportation system. The framework view of planning and construction plays an indispensable role in the transportation system architecture.

The physical architecture is composed of Information interaction pairs, and each information interaction pair consists of a pair of physical objects starting and ending points and an information flow. For each sub-service, according to the implementation logic of "perception-decision-learning-response", physical objects are organized through information flow, and the service implementation process is represented by the generation and transmission of physical information flow, thus forming a physical architecture.

physical architecture

The physical architecture organizes physical objects through information flow to form information interaction pairs. The information flow is aggregated based on the logical architecture data flow. There is a mapping relationship between data flow and information flow, which enables the physical architecture to realize the service process analyzed by the logical architecture through the generation and transmission of information.

Physical objects are abstract representations of actual traffic entities and service as abridge connecting the functional architecture with the physical architecture. According to the complexity of the implemented sub-functions, they are divided into three categories: system, module and individual. The system provides different types of high-complexity functions, modules provide the same type of low-complexity functions, and individuals provide no functions. . In addition, multiple attributes are defined to describe physical objects.

(1) Object category: Describes the complexity of the functions implemented by physical objects, and the complexity of individuals, modules, and systems increases in sequence.

(2) Operational logic: Indicates the link of the sub-function in the service implementation process, which is divided into "perception", "learning", "decision-making" and "response".

(3) Traffic information participation methods: Describes the role of physical objects in traffic system information interaction, including the "generation", "processing" and "understanding" of information.

(4) Access capabilities: Describes the communication methods and protocols supported by physical objects, which determines whether there can be interaction between physical objects.

(5) Mapping logic: Describes the service implementation logic corresponding to the physical object, including the provided functions and the inherited functions, which determines whether there is interaction between physical objects.