This document specifies the sensor data fusion applicable to the use cases of indoor and outdoor seamless positioning solutions for a mobile user (multimodal transportation) in intelligent transport system (ITS) stations.

This document provides technical requirements for data fusion between three domains:

1. nomadic device [e.g. personal intelligent transport system station (P-ITS-S)],
2. mobility [e.g. vehicle intelligent transport system station (V-ITS-S)], and
3. infrastructure [e.g. roadside intelligent transport system station (R-ITS-S)].

The data exchange between these domains is based on a standardized message and data format and this document identifies use cases for each different case of communication between domains.