Bmw “Car-to-x” communication extends this horizon significantly

Article by Christian Andrei, on October 28, 2011

BMW Group considers forward thinking as a vital factor in the area intelligent driving, which also encompasses energy-efficient and safe driving. This is why BMW Group has installed several sensors on its vehicles -- all designed to improve safety, efficiency and comfort. However, these sensors usually have limited “horizon,” or predictive capability.

BMW plans to significantly extend this horizon through the “Car-to-x” communication platform that would allow drivers to “see” long distances ahead. “Car-to-x” communication also allows drivers to see into areas hidden from view, and around many corners. Car-to-x communication is basically an electronic network of vehicles and roadside infrastructure that could exchange information between road users as well as between road users and roadside infrastructure (like traffic lights).

Interestingly, car-to-x communication is so comprehensive that it allows any road user to participate. Car-to-x communication typically uses WLAN or mobile phone connections to operate. As standard, car-to-x communication currently employs high-speed WLAN networking based on the WLAN IEEE802.11p/ G5A standard, which could allow real-time communication.

This protocol is considered suitable for car-to-x communication as it permits large numbers of participants to communicate simultaneously sans any interference. This direct communication via WLAN is complemented by the use of mobile phone networks, which have seen improvements at a steady rate. Furthermore, mobile phone networks have been improving in terms of bandwidth and latency times.

BMW Group has been working on integrated and connected vehicle functions since the 1990s when it introduced BMW ConnectedDrive, which allows for connectivity for infotainment applications. For the past few years, BMW Group’s r&d work has been increasingly focused on providing integrated and connected comfort as well as safety functions. This is where car-to-x communication comes in.

Extensive connectivity between vehicles should provide ample and advanced warning over potential dangers during a hazard to oncoming and following vehicles. This would allow drivers of these oncoming and following vehicles to respond and react accordingly. However, warnings represent just one aspect in which car-to-x communication could be a new solution.

Car-to-x communication could also cover infrastructure data (like traffic light phases). Drivers can be fed with information that allows them to adapt their driving style to achieve greater efficiency, thus lower vehicle emissions. Therefore, car-to-x communication could provide innovative solutions not just for proactive safety and accident prevention but also in the area of intelligent energy management.

When employed along with existing vehicle sensors, car-to-x communication could serve as a good basis or even improvement for a wide array of future BMW ConnectedDrive driver assistance and information systems.

These systems, when used along with driver input, could result to a high-performance macrosystem that could ensure safety and efficiency during a trip. Karl-Ernst Steinberg, Head of Information and Communication Technologies at BMW Group Research and Technology, quipped that the more information a driver has about the rest of the journey – like the changing of traffic lights or an accident along the route – the better and the quicker the reaction is. This should result in less stress to the driver, allowing him or her to avoid hazardous situations or reduce the risk.

Press Release

When cars talk to each other

The key to intelligent driving, which is synonymous with energy-efficient and safe driving, is forward thinking. To help drivers plan ahead, vehicles from the BMW Group are already fitted with a large number of sensors designed to improve safety, comfort and efficiency. Often, however, these sensors have only a limited predictive capability or “horizon”. “Car-to-x” communication extends this horizon significantly, and will in future allow drivers to “see” long distances ahead, into areas currently hidden from view, and even around not just one but many corners.

Car-to-x communication means electronic networking of vehicles and roadside infrastructure, with the aim of exchanging information directly both between road users and between road users and roadside infrastructure such as traffic lights. Car-to-x communication is a comprehensive communication network which any road user can take part in.

Car-to-x communication usually operates via WLAN or mobile phone connections. For standard automotive application, car-to-x communication at present uses high-speed WLAN networking based on the high-frequency WLAN IEEE802.11p/ G5A standard, which is designed to allow real-time communication. The protocol allows large numbers of participants to communicate simultaneously without interference. At the same time the performance of mobile phone networks is improving steadily, with an increase in bandwidth and a reduction in data lag – the so-called latency times. Therefore, this type of medium, too, is becoming increasingly important for car-to-car communication, for example as a complement to direct communication via WLAN.

Connectivity brings added value.

Integrated and connected vehicle functions are nothing new within the BMW Group. Connectivity for infotainment applications already made its debut in the 1990s with BMW ConnectedDrive. For some years, the focus of development work in the BMW Group has been shifting increasingly towards integrated and connected comfort and, in particular, safety functions. Here, car-to-x communication opens up completely new potential. In the event of a hazard, extensive connectivity between vehicles allows oncoming and following traffic to be given advance warning of potential dangers, and therefore to react appropriately and in good time. But warnings are only one possible use of this communication platform. Since infrastructure data, too – for example about traffic light phases – can be integrated into this communication system, information is available which allows drivers to easily adapt their driving style for even greater efficiency, thereby significantly reducing vehicle emissions. This technology therefore offers new solutions not only for proactive safety and accident prevention but also for intelligent energy management.

“The more information I have about the rest of my journey – for example, if I know in advance when traffic lights will change, or if I know that an accident has just happened further along the route – the more promptly I can react, which means I have less stress and can either avoid hazardous situations altogether or at least reduce the risk.” (Karl-Ernst Steinberg, Head of Information and Communication Technologies at BMW Group Research and Technology).

In combination with existing vehicle sensors, car-to-x communication provides a valuable starting point or enhancement for a wide range of BMW ConnectedDrive driver assistance and information systems of the future. These technologies, combined with the driver’s own input, create an extremely high-performance macrosystem capable of ensuring a safe and efficient journey from start to finish.

Topics: bmw, technology

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