At the 2016 SAE-China Congress & Exhibition from October 26-28 in Shanghai, General Motors teamed up with the China Academy of Information and Communications Technology (CAICT), Tsinghua University, Chang’an Auto, Yanfeng Visteon and Shanghai International Auto City to demonstrate the interoperability of the emerging China connected vehicle (V2X) application layer standard for the first time.
A complete set of communication standards is necessary for underpinning an intelligent transportation system (ITS) using connected vehicles as a key component. GM, Tsinghua University and Chang’an Auto are leading a working group for the development of the V2X application layer and application data-exchange service standard with the support of SAE-China and C-ITS (China ITS Industry Alliance).
The goal of the working group is to standardize V2X message formats agnostic to lower-layer communication technology. The WG is using a message set dictionary similar to SAE J2735 as the basis, taking into account unique traffic characteristics in China.
|Source: Huawei. Click to enlarge.|
The working group initially completed a definition and demand analysis of the applications, and is now working to define the required message set dictionary and data exchange standards.
The required message set dictionary defines the content, format and coding methods for data exchange at the application layer. The data exchange standards stipulate time, frequency, data requirements and interface definition for data exchange.
Through the demonstration, the working group improved and verified the required message set dictionary and data exchange standards at the V2X application layer. In addition, it generated important reference data to bolster China’s further research on intelligent and connected vehicles (ICVs) and pave the way for their future deployment.
V2X has the potential to mitigate many traffic collisions and improve traffic congestion by sending and receiving basic safety information such as location, speed and direction of travel between vehicles. For this type of cooperative technology to work, it is essential that common standards and a security framework be established.
We are pleased to bring to China the expertise that we have gained from developing and promoting V2X technology in North America and Europe to drive ICV development in China.—Dr. John Du, director of GM China Science Lab
The demonstration included the following safety applications: Blind Spot/Lane Change Warning, Forward Collision Warning, Intersection Movement Assist and Special Vehicle Avoid Notification.
In a paper published earlier this year (“Global Harmonization Of Connected Vehicle Communication Standards”), the Michigan Department of Transportation and the Center for Automotive Research (CAR) noted that connected vehicle standards in China are lagging behind the rapid market growth driven by global auto manufactures and domestic telecommunication service providers.
China has set aside spectrum (5.795-5.815GHz) for ITS applications - mainly for ETC, traveler information systems, traffic operation, and fleet management.