Mentioned earlier V2X is the Vehicle the To Everything , that is, all of the information exchange outside the team, where X represents the Everything , in V2X concept, we see it as four parts, vehicles and communication vehicle ( V2V ), vehicle infrastructure and road signs communications ( V2I ), cars and people communication ( V2P ) and the vehicle operator's network communications ( V2N );
Since it is communication, it will have a standard, today's article, mainly to introduce V2X standard, the first mainstream standards are the following national standard, European standard, American standard, Japanese standard;
GB:
2017 Nian 9 months, China's V2X application layer standards "cooperative intelligent transport systems automotive application layer and application layer data exchange standard communication system" after a year and seven months of effort officially born, and relying on intelligent network linking China's auto industry innovation Union and China intelligent transportation industry Alliance, and relying on China automobile industry innovation Alliance with intelligent network and Chinese intelligent transportation industry Alliance to form a double label ( T / CSAE 53-2017 , T / the ITS 0058-2017 ) community standards. Where the application layer data set specification section, and network layer specification has been integrated to form the draft national standard "Dedicated Short Range Communication Cooperative Intelligent Transport System 3 parts: the network layer and application layer specification" urgent release.
So far, China's V2X wisdom of roads and vehicles, and truly have a unified and autonomous "language and script."
Download Link: http://www.caicv.org.cn/index.php/newsInfo/downLoad?id=1721
You need to use the tool: https://github.com/vlm/asn1c/releases
GB There are five messages the BSM , RSI , RSM , SPAT , MAP
The BSM , i.e. Basic the Safety the Message , the underlying security message, including speed, steering, brakes, double flash, location, etc., are used in a multi V2V scene lane change warning i.e., blind spot warning, intersection collision warning and the like;
RSI , namely Road Side Information , roadside information for the bottom of the incident, a roadside RSU integrated, issued under the platform, is used for multi- V2I scene that is road construction, speed limit signs, speeding warning, warning bus lanes and so on;
The RSM , i.e. Road the Safety the Message , roadside safety message is V2I , abutting the main road side edge device for identifying an event, such as a vehicle accident, the vehicle abnormality, the foreign matter intrusion and the like;
The SPAT , i.e. Signal Timing Phase Message , traffic light phase timing message is V2I , roadside RSU integrated signal, or a signal by UU passing manner to the platform, for guiding a vehicle speed, a scene push green wave like;
The MAP , i.e. the MAP , the map information, the map message and SPAT used with the message, the MAP message may describe an intersection, the traffic light, and there is a correspondence relationship junction;
Two European standard information protocol stack standard CAM and DENM :
CAM , Cooperative Awareness the Message , cooperation sensory information, which is time-triggered speed information, provide vehicle, location, direction lights and traffic signal systems such as the state of the traffic lights, weather, reminders, and other information;
DENM , Decentralized Environmental the Notification the Message , distributed environments notification information, mainly for road hazard warning application is time-triggered information, once to the security risk events through the in-vehicle device detection (eg front of the vehicle emergency brake, road construction warning, etc.), automotive ITS related applications immediately launch DENM information, receives the vehicle can compare the vehicle's own position and driving directions, judge events from car association estimates potential risk of collision, the driver is notified in advance and take effective measures, according to location and type of event , may be required to receive DENM information outside the vehicle forward;
Standard open source connected:
https://github.com/alexvoronov/geonetworking ( the Java project)
https://github.com/riebl/vanetza ( C ++ project)
V2X want to learn about the latest development and vehicle networking technology, you can focus on my public account yo: GeekStyle
