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Table 1 defines the CAV-specific Terms.
Table 1 – Terms and Definitions
Note A dash “-” preceding a Term in this Table means the following:
- If the font is normal, the Term in the table without a dash and preceding the one with a dash should be placed before that Term. The notation is used to concentrate in one place all the Terms that are composed of, e.g., the word Audio followed by one of the words Object, Scene, and Scene Descriptors.
- If the font is italic, the Term in the table without a dash and preceding the one with a dash should be placed after that Term. The notation is used to concentrate in one place all the Terms that are composed of, e.g., the word Attitude preceded by one of the words Social or Spatial.
| Term | Definition |
| Acceleration | The 2nd order time derivative of a Position or Orientation. |
| – Coordinate | The acceleration measured in a coordinate system. |
| – Proper | The physical acceleration, i.e., measured by an accelerometer experienced by an object. |
| Accuracy | An estimate of how well the measurement of a physical entity corresponds to the actual value of that entity. |
| Alert | A Data Type representing environment-related elements that should be treated with priority by the Obstacle Avoider AIM. |
| AMS-MAS Message | A Data Type representing the command issued by the Autonomous Motion Subsystem instructing the Motion Actuation Subsystem to change the Ego CAV’s Spatial Attitude SAA at time tA to Spatial Attitude SAB at time tB and the response of the MAS to the AMS-MAS Message. |
| AMS-HCI Message | A Data Type representing high-level instructions issued by HCI to AMS to request it to reach a destination and the response of the AMS. |
| Brake | |
| – Command | A Data Type representing the command that the Motion Actuation Subsystem issues to the Brakes after interpreting an AMS-MAS Message. |
| – Response | A Data Type representing the Brakes’ response to the AMS Command Interpreter in response to a Brake Command. |
| CAV | See Connected Autonomous Vehicle. |
| – Aware | An attribute of equipment possessing some of the sensing and communication capabilities of a CAV without being a CAV, e.g., Roadside Units and Traffic Lights. |
| – Centre | The point in the Ego CAV selected to have coordinates (0,0,0). |
| – Ego | The Object in the Environment that the CAV recognises as itself. |
| – Identifier | A Data Type uniquely identifying a CAV and carrying information, such as: 1. Country code where the CAV has been registered. 2. Registration number in that country. 3. CAV manufacturer identifier. 4. CAV model identifier. |
| Connected Autonomous Vehicle | (CAV) The information technology-related components of a vehicle enabling it to autonomously reach a Pose by: 1. Understanding human utterances in the Subsystem (HCI). 2. Planning a Route (AMS). 3. Sensing and building a Representations of the external Environment (ESS). 4. Exchanging such Representations and other Data with other CAVs and CAV-aware entities (AMS). 5. Making decisions about how to execute the Route (AMS). 6. Acting on the MAS (AMS). |
| – State | A Description of the state of the CAV generated by the CAV’s AMS using information available inside the CAV as assessed by the CAV and received from an external source, e.g., another CAV or Roadside Unit. |
| Data | Information in digital form |
| – Accelerometer | A Data Type representing the acceleration forces acting on a CAV. |
| – Environment | A Data Type representing the Environment such as produced by an Environment Sensing Technology or derived from the Basic or Full Environment Representation. |
| – LiDAR | A Data Type representing Data captured by a LiDAR sensor. |
| – Odometer | A Data Type representing the distance from the start up to the current Pose measured by the number of wheel rotations times the tire circumference (π x tire diameter). |
| – Offline Map | A Data Type representing the Data provided by an Offline Map in response to a given set of coordinate values. |
| – RADAR | A Data Type representing the Visual Data captured by a RADAR sensor. |
| – Speedometer | A Data Type representing the speed of a CAV as measured by the sensor. |
| – Ultrasound | A Data Type representing the Data provided by an ultrasonic sensor. |
| – Weather | Weather Data is a set of data that includes Temperature, Humidity, Air Pressure, Ice conditions, Wind conditions and Condensed water in various states. |
| Decision Horizon | The time interval within which a decision is planned to be implemented. |
| Environment | The Digital Representation of the portion of the environment of current interest to a CAV. |
| – Sensing Technology | (EST) One of the technologies used to sense the environment by the Environment Sensing Subsystem, e.g., RADAR, LiDAR, Visual, Ultrasound, Audio, and including the Offline Map. |
| Environment Scene Descriptors | A Data Type representing the combination of EST-specific 2D, 2.5D, or 3D Scene Descriptors used by an EST Scene Description in an EST-specific time window. |
| – Basic | (BED) A Data Type representing Environment using information provided by a variety of sensors and including: – The Ego CAV’s Spatial Attitude. – The Scene Description produced from the available Environment Sensing Technologies. – Weather Data. |
| – Full | (FED) A Data Type representing the Environment that extends the Basic Environment Representations of the Ego CAV with elements of those of other CAVs in range or Roadside Units. |
| Global Navigation Satellite System (GNSS) | One of the systems providing global navigation information such as GPS, Galileo, Glonass, BeiDou, Quasi Zenith Satellite System (QZSS) and Indian Regional Navigation Satellite System (IRNSS). |
| Goal | The Spatial Attitude planned to be reached at the end of a Decision Horizon. |
| Inertial Measurement Unit | An inertial positioning device, e.g., odometer, accelerometer, speedometer, gyroscope etc. |
| Latitude | A Data Type representing the angular distance of a point on the surfave of the Earth lace north of the equator measured in degrees. |
| LiDAR | A Data Type representing analogue signals generated by information captured by an active time-of-flight sensor operating in the µm range – ultraviolet, visible, or near infrared light (900 to 1550 nm). |
| Longitude | A Data Type representing the angular distance of a place west of the Greenwich meridian measured in degrees [4]. |
| MAS Subsystem | The CAV Subsystem interpreting AMS-MAS Messages; issuing commands and receiving responses from Brakes, Wheel, and Motors; and responding with AMS-MAS Messages. |
| Motor | |
| – Command | A Data Type representing the command issued to a Motor by the Motion Actuation Subsystem after interpreting an AMS-MAS Message. |
| – Response | A Data Type representing the Motor’s response to AMS Command Interpreter in response to a Motor Command. |
| Offline Map | A previously created digital map of an Environment and associated metadata. |
| Path | A Data Type representing a sequence of Poses. |
| Pose | A Data Type representing Position and Orientation of the CAV as obtained by processing the data from the CAV sensors. |
| RADAR | A Data Type representing analogue signals generated by information captured by an active time-of-flight sensor operating in the operating in the 24-81 GHz range. |
| Remote | |
| – AMS | AMS of a CAV or CAV-Aware entity in range. |
| – HCI | HCI of a CAV or CAV-aware entity in range. |
| Road | |
| – Geometry | A Data Type representing the positioning of the physical elements of the roadway, e.g., traffic poles, road Signs, traffic tights, etc. |
| – State | A Data Type representing the state of the road the CAV is traversing such as detours and road conditions. |
| – Topology | The geometric properties and spatial relationships of objects in a traffic environment. |
| Roadside Unit | A wireless communicating device located on the roadside providing information to CAVs in range. |
| Route | A Data Type representing a sequence of Waypoints. |
| Scene Descriptors | |
| – LiDAR | A Data Type describing the LiDAR Data and produced by the LiDAR Scene Description AIM using previous Basic Environment Representations. |
| – Offline Map | A Data Type including the objects of a Scene described by an Offline Map. |
| – RADAR | A Data Type representing the Visual Data captured by RADAR and produced by the RADAR Scene Description AIM using previous Basic Environment Representations. |
| – Ultrasound | A Data Type representing the Visual Data captured by Ultrasound and produced by the Ultrasound Scene Description AIM using previous Basic Environment Representations. |
| Shape | A Data Type representing the volume occupied by a CAV. |
| Subsystem | One of HCI, ESS, AMS, and MAS. |
| Traffic | |
| – Rules | A Data Type representing the traffic rules applying to an Environment as extracted from the local Traffic Signals based on the local traffic rules. |
| – Signals | A Data Type representing the traffic signals on a road and around it, their Spatial Attributes, and the semantics of the traffic signals. |
| Ultrasound | A Data Type representing analogue signals generated by information captured by an ultrasonic sensor, an active time-of-flight sensor typically operating in the 40 kHz to 250 kHz range. |
| Waypoint | The coordinates of a point on an Offline Map. |
| Wheel | |
| – Command | A Data Type representing the command issued to the Steering Wheel by the Motion Actuation Subsystem after interpreting an AMS-MAS Message. |
| – Response | A Data Type representing the Wheel’s response to the AMS Command Interpreter in response to a Direction Command. |
The Terms used in this standard whose first letter is capital and are not already included in Table 1 are defined in Table 2.
Table 2 – MPAI-wide Terms
| Term | Definition |
| Access | Static or slowly changing data that are required by an application such as domain knowledge data, data models, etc. |
| AI Framework (AIF) | The environment where AIWs are executed. |
| AI Modules (AIM) | A data processing element receiving AIM-specific Inputs and producing AIM-specific Outputs according to according to its Function. An AIM may be an aggregation of AIMs. |
| AI Workflow (AIW) | A structured aggregation of AIMs implementing a Use Case receiving AIW-specific inputs and producing AIW-specific outputs according to the AIW Function. |
| Application Standard | An MPAI Standard designed to enable a particular application domain. |
| Channel | A connection between an output port of an AIM and an input port of an AIM. The term “connection” is also used as synonymous. |
| Communication | The infrastructure that implements message passing between AIMs |
| Composite AIM | An AIM aggregating more than one AIM. |
| Component | One of the 7 AIF elements: Access, Communication, Controller, Internal Storage, Global Storage, Store, and User Agent |
| Conformance | The attribute of an Implementation of being a correct technical Implementation of a Technical Specification. |
| Conformance Tester | An entity Testing the Conformance of an Implementation. |
| Conformance Testing | The normative document specifying the Means to Test the Conformance of an Implementation. |
| Conformance Testing Means | Procedures, tools, data sets and/or data set characteristics to Test the Conformance of an Implementation. |
| Connection | A channel connecting an output port of an AIM and an input port of an AIM. |
| Controller | A Component that manages and controls the AIMs in the AIF, so that they execute in the correct order and at the time when they are needed |
| Data Format | The standard digital representation of data. |
| Data Semantics | The meaning of data. |
| Ecosystem | The ensemble of actors making it possible for a User to execute an application composed of an AIF, one or more AIWs, each with one or more AIMs potentially sourced from independent implementers. |
| Explainability | The ability to trace the output of an Implementation back to the inputs that have produced it. |
| Fairness | The attribute of an Implementation whose extent of applicability can be assessed by making the training set and/or network open to testing for bias and unanticipated results. |
| Function | The operations effected by an AIW or an AIM on input data. |
| Global Storage | A Component to store data shared by AIMs. |
| Internal Storage | A Component to store data of the individual AIMs. |
| Identifier | A name that uniquely identifies an Implementation. |
| Implementation | 1. An embodiment of the MPAI-AIF Technical Specification, or
2. An AIW or AIM of a particular Level (1-2-3) conforming with a Use Case of an MPAI Application Standard. |
| Implementer | A legal entity implementing MPAI Technical Specifications. |
| ImplementerID (IID) | A unique name assigned by the ImplementerID Registration Authority to an Implementer. |
| ImplementerID Registration Authority (IIDRA) | The entity appointed by MPAI to assign ImplementerID’s to Implementers. |
| Interoperability | The ability to functionally replace an AIM with another AIW having the same Interoperability Level |
| Interoperability Level | The attribute of an AIW and its AIMs to be executable in an AIF Implementation and to:
1. Be proprietary (Level 1) 2. Pass the Conformance Testing (Level 2) of an Application Standard 3. Pass the Performance Testing (Level 3) of an Application Standard. |
| Knowledge Base | Structured and/or unstructured information made accessible to AIMs via MPAI-specified interfaces |
| Message | A sequence of Records transported by Communication through Channels. |
| Normativity | The set of attributes of a technology or a set of technologies specified by the applicable parts of an MPAI standard. |
| Performance | The attribute of an Implementation of being Reliable, Robust, Fair and Replicable. |
| Performance Assessment | The normative document specifying the Means to Assess the Grade of Performance of an Implementation. |
| Performance Assessment Means | Procedures, tools, data sets and/or data set characteristics to Assess the Performance of an Implementation. |
| Performance Assessor | An entity Assessing the Performance of an Implementation. |
| Profile | A particular subset of the technologies used in MPAI-AIF or an AIW of an Application Standard and, where applicable, the classes, other subsets, options and parameters relevant to that subset. |
| Record | A data structure with a specified structure |
| Reference Model | The AIMs and theirs Connections in an AIW. |
| Reference Software | A technically correct software implementation of a Technical Specification containing source code, or source and compiled code. |
| Reliability | The attribute of an Implementation that performs as specified by the Application Standard, profile and version the Implementation refers to, e.g., within the application scope, stated limitations, and for the period of time specified by the Implementer. |
| Replicability | The attribute of an Implementation whose Performance, as Assessed by a Performance Assessor, can be replicated, within an agreed level, by another Performance Assessor. |
| Robustness | The attribute of an Implementation that copes with data outside of the stated application scope with an estimated degree of confidence. |
| Scope | The domain of applicability of an MPAI Application Standard |
| Service Provider | An entrepreneur who offers an Implementation as a service (e.g., a recommendation service) to Users. |
| Standard | The ensemble of Technical Specification, Reference Software, Conformance Testing and Performance Assessment of an MPAI application Standard. |
| Technical Specification | (Framework) the normative specification of the AIF.
(Application) the normative specification of the set of AIWs belonging to an application domain along with the AIMs required to Implement the AIWs that includes: 1. The formats of the Input/Output data of the AIWs implementing the AIWs. 2. The Connections of the AIMs of the AIW. 3. The formats of the Input/Output data of the AIMs belonging to the AIW. |
| Testing Laboratory | A laboratory accredited to Assess the Grade of Performance of Implementations. |
| Time Base | The protocol specifying how Components can access timing information |
| Topology | The set of AIM Connections of an AIW. |
| Use Case | A particular instance of the Application domain target of an Application Standard. |
| User | A user of an Implementation. |
| User Agent | The Component interfacing the user with an AIF through the Controller |
| Version | A revision or extension of a Standard or of one of its elements. |
