ITU-T Recommendations

Recommendation ITU-T H.552 specifies essential requirements for the implementation of vehicle multimedia systems (VMSs), addressing four of their main aspects:
–connectivity, providing essential standard references and specific performance requirements for the vehicular environment;
–human machine interface, dealing with voice assistant (VA) and auditory interaction requirements;
–media format and control, providing standard references for different types of media for VMSs;
–smartphone infotainment assistant, with requirements related to the interface architecture between smartphones and VMSs, as well as performance requirements to provide a fair level of user experience.
Two appendices provide VMS implementation guidance:
–radio frequency performance criteria for wireless local area network (WLAN) and user performance testing scenarios for WLAN and wireless personal area network connectivity;
–implementation of a diagnostic interface for tuning the VA functionalities.