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Air safety authorities are forced to develop regulations for UAS due to incidents disturbing public safety and demands from UAS operators. Despite numerous studies from the FAA and EASA, none of them decided on a regulation for UASs. The reliability of the flight is considered to be one of the main obstacles for UAVs integration. This is not an easy topic considering the unknowns of the systems, environment...
As demands increase to use unmanned aircraft systems (UAS) for a broad spectrum of commercial applications, regulatory authorities are examining how to safely integrate them without loss of safety or major disruption to existing airspace operations. This work addresses the development of the Safeguard system as an assured safety net technology for UAS. The Safeguard system monitors and enforces conformance...
The Vehicular Ad-Hoc Networks (VANETs) provide communication services for time-critical road safety applications, general purpose ITS services for traffic efficiency, and non-safety value-added infotainment applications. The challenges of multichannel VANET Medium Access Control (MAC) protocol include successful delivery of time-critical safety messages within 100 ms with high reliability, and high...
IEEE 802.11p/1609.4 standard is based on a multichannel system consisting of multiple service channels (SCH) and a control channel (CCH). Most messages broadcast in the CCH belong to safety application that must be received with high reliability by all vehicles. This paper proposes a novel mechanism based on which the size of the contention window and the time interval of the CCH is tuned adaptively...
Broadcasting plays vital role in vehicle-to-vehicle communication. However, it must face to challenges such as lack of acknowledgment, no retransmission, hidden terminals and low link quality that leads to unreliable communication because of message loss caused by collisions and poor link conditions. It is especially critical for safety messages in vehicular networks. To make broadcast more reliable,...
VANETs are becoming more and more popular as a way to increase the traffic safety and comfort. The IEEE 802.11p standard, especially the 802.11p MAC protocol, has attracted much attention as part of the WAVE protocol in VANETs. Safety applications, as one of the main categories of applications in VANETs, is very challenging for the design of a MAC protocol due to their low latency and high reliability...
This paper investigates how wireless communication and vehicular ad hoc network (VANET) based technologies can be applied in relation to road construction work sites to improve safety and increase efficiency and sustainability. It discusses how to design the flow of data for a number of functions and how to operate the functions at the work site even at low VANET penetration rates. The applications...
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