The use of communication technologies to increase road safety is rising within the automobile world. Many entities cooperate to find the best solution to add safety services relying on vehicle to vehicle communication systems (V2V) and among vehicles and the infrastructure (V2I) located on the roadside. However due the relatively low vehicle renewal rate and economy restrictions a large transitory period is expected to happen. Safety services, such as collision or emergency electronic brake lights have delay-critical requirements. This work-in-progress paper (WiP) proposes a WAVE (Wireless Access for Vehicular Environment) based architecture and a MAC protocol where Road Side Units (RSUs) play a central role in scheduling vehicles safety message transmission with guaranteed bounded delay.

The use of wireless communication technologies to increase road safety is rising within the automobile world. Vehicle to vehicle (V2V) communications is a very promising field but the slow vehicle renewal rate combined with the current world economic crisis turns V2V into a distant scenario. A more viable solution relies on Infrastructure to vehicle communications (I2V) and the use of the wireless access for vehicular environment (WAVE) standard, specifically tailored for delivering safety and multimedia messages in a highly dynamic communication environment. This work-in-progress paper addresses an open issue in a previous presented infrastructure based solution: the beacon coordination between adjacent road side units (RSUs) and also a safety message retransmission mechanism performed by such RSUs.

The use of IEEE 802.11p for supporting intelligent transportation systems (ITS) enables enhancing the drive experience to provide vehicle users with useful information related to road efficiency and public safety. Safety services, such as collision or sudden hard braking warning, are used to improve passenger safety and reduce fatalities. Along with the delay-critical nature of those services, the highly dynamic communication environment of vehicular networks demand an efficient medium access control (MAC) protocol to assure minimal transmission collisions. This work-in-progress paper presents a preliminary study on the adequacy of existent 802.11p based MAC protocols regarding safety applications, and proposes ideas to implement such services in an effective way assuming an infrastructure based operation mode.

IEEE802.15.4 is used for low-data-rate connectivity among fixed or moving devices, with low-cost and low-power consumption, in applications in residential and industrial environment, e.g. home automation and automotive. The flexible time-triggered paradigm (FTT) allows different types of traffic (time and event-triggered, hard and soft real-time) with temporal isolation between each other and a flexible handling of time-triggered traffic with dynamic communication requirements. This paper proposes a preliminary solution for the transmission of real-time time-triggered traffic over the 802.15.4 standard, as a beginning to implement a full FTT protocol. The envisaged applications are in the field of home automation with real-time requirements to convey life support signals and in infrastructure or vehicle to vehicle communications (I2V and V2V).

The paper discusses some new hardware and software tools that can be used for the design of virtual circuits based on dynamically reconfigurable FPGAs. With the aid of these tools we can implement a system that requires some, hardware resources R/sub c/, on available hardware that has resources R/sub h/, where R/sub c/>R/sub h/. The main idea of the approach supported by these tools is the rational combination of FPGA capabilities with some proposed methods for producing a modifiable specification, together with a novel technique for architectural and logic synthesis, which has been incorporated into the new design environment.

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