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Renesas Electronics designs automotive wireless communication for Vehicle-to-Infrastructure communication
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Renesas Electronics designs automotive wireless communication for Vehicle-to-Infrastructure communication

Posted by Zenobia HegdeOctober 1, 2015

Renesas Electronics, a premier supplier of advanced semiconductor solutions, today announced the R-Car W2R system-on-a-chip (SoC), the first member of the new Renesas R-Car Family of devices developed specifically for V2X applications. The new automotive wireless communication SoC is designed for Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communication in the 5.9-gigahertz (GHz) band.

The R-Car W2R delivers top-class performance when using Renesas’s exclusive radio frequency (RF) system design technology. It is the first device of this type capable of reducing out-of-band transmit emissions to less than 65 decibel-milliwatts (dBm) , achieving the requirements of the European standards organisation European Telecommunications Standards Institute (ETSI). Transmitting high-quality signals with very little interference makes it possible to incorporate V2X into various types of Advanced Driving Assistance System (ADAS) applications, such as forward collision warning and lane keep assistance. The R-Car W2R also conforms to the Institute of Electrical and Electronics Engineers (IEEE) 802.11p communication standard for Intelligent Transport Systems (ITS) used in Europe and North America.

Previous safe driving assistance systems relied on technologies such as camera images, infrared signals, and milli-wave radar. However, there are tradeoffs with these, such as the inability to track traffic conditions over wide areas and difficulty obtaining information on vehicles approaching intersections where visibility is poor. V2X aims to reduce vehicular accidents and traffic congestion by enabling direct, bi-directional communication between vehicles (V2V) and between vehicles and signal devices or road signs (V2I), without the need to route data through the cloud. V2X communication standards are being adopted in various countries and a number of companies including Renesas are accelerating development work in this area with the expectation that V2X will become an important technology for drivers in the years ahead.

Europe and North America have already adopted the IEEE 802.11p 5.9 GHz band wireless communication standard, which enables vehicles to obtain information on approaching vehicles outside line of sight and over a wide area. The R-Car W2R complies with this standard and enables the reliable collection of information on vehicles and infrastructures over a wide area to enable high-quality signal transmission. When combined with existing products based on the R-Car platform, it enables bi-directional V2V and V2I communication of information that cannot be picked up using camera images or radio waves. This allows Advanced Driver Assistance Systems (ADAS) development for enhanced safety and comfort, making it possible to alert the driver with accurate, real-time information.

Key features of the R-Car W2R system on chip (SoC):

 1) Exclusive RF system design technology that reduces out-of-band transmit emission to less than 65 dBm level for the first time ever

The R-Car W2R is based on exclusive RF system design technology that reduces noise generation by the chip itself and combines with a filter to block external noise, resulting in the suppression of out-of-band noise to less than the 65 dBm level for the first time ever in a device of this type. This satisfies the demanding requirements set by the ETSI and delivers leading level of low out-of-band noise. This also makes it possible to track traffic conditions over wide areas and to obtain accurate information on vehicles approaching intersections where visibility is poor. Thus, 5.9 GHz band wireless communication can now be incorporated into driver assistance systems requiring the highest level of safety.

2) IEEE 802.11p compliance and single-chip integration of communication functions from RF to the physical layer and the data link layer

The R-Car W2R integrates the V2X communication functionality for linking RF to both the physical and the data link layers in a 10 mm x 10 mm single package. This contributes to the compactness of vehicle information systems. Previously, separate chips were needed to link the RF and the physical layer and the RF and the data link layer. The R-Car W2R leverages Renesas technology to miniaturise analog circuit designs and mixed analog-digital design technology to accurately analyse the effects of noise generated by digital circuits on analog circuits.

3) V2X ecosystem helps system manufacturers reduce development time and costs

To help reduce ADAS design complexity for system manufacturers working with the new R-Car W2R, Renesas has developed a starter kit, which combines all the components required in a V2X unit including the R-Car E2 SoC, which implements security IP ideal for V2X applications, and along with drivers and software verified with Intelligent Transportation System (ITS) protocol partners. The reference design, in which the R-Car W2R is integrated in a compact module with RF components in an optimised design is available with the related design information to help reduce the initial design time and costs. All the components required in a V2X unit including the R-Car E2, which implements security IP ideal for V2X applications are provided as part of a starter kit that also comes with drivers and software verified with ITS protocol partners. The system manufacturers can utilise the starter kit and Renesas ecosystem partners to migrate their own software, reducing the time required for verification testing and other processes.

Renesas plans to offer solutions with support for V2X applications by combining the R-Car W2R with existing R-Car products for cockpit and ADAS applications.

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Zenobia Hegde

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