22 documents found, page 1 of 3
A Medium Guardian for Enhanced Dependability in Safety-Critical Wireless Systems
Almeida, João Miguel Pereira de; Ferreira, Joaquim José de Castro; Oliveira, ArnaldoAccording to the recent perspectives for the next generation of mobile networks (5G), future wireless communications will be able to support the operation of safety-critical systems, such as remote surgery or vehicle platooning. For that purpose, high reliability and availability values (> 99.999%), as well as low end-to-end delay (<; 1 ms), are included in the requirements specification. In order to achieve th...
Fail silence mechanism for dependable vehicular communications
Almeida, João Miguel Pereira; Ferreira, Joaquim Castro; Oliveira, ArnaldoThis paper presents a fault-tolerant architecture to improve the dependability of infrastructure-based vehicular networks. For that purpose, a fail silence enforcement mechanism for road-side units (RSUs) was designed, implemented and tested. Vehicular communications based on IEEE 802.11p are inherently non-deterministic. The presence of RSUs and a backhauling network, adds a degree of determinism that is usefu...
Automatic Accident Detection with Multi-modal Alert System Implementation for ITS
Silva, Bruno Fernandes; Alam, Muhammad; Gomes, Vitor; Ferreira, Joaquim Castro; Oliveira, ArnaldoThe rapid technological growth is now providing global opportunities to enable intelligent transportation system (ITS) to tackle road accidents which is considered one of the world's largest public injury prevention problem. For this purpose, eCall is an initiative by European Union (EU) with the purpose to bring rapid assistance to an accident location. This paper1 presents HDy Copilot, an application for auto...
Fault Tolerant Architecture for Infrastructure based Vehicular Networks
Almeida, João; Ferreira, Joaquim Castro; Oliveira, ArnaldoWireless vehicular communications have been a trending topic in the last few years, leading to the development of a complete set of new standards and the emergence of innovative vehicular applications. Despite the obvious benefits of vehicular networks, it has been a challenging issue to design dependable vehicu- lar communication systems. This is mainly due to the high speed mobility scenarios that are involve...
HDy Copilot: A Mobile Application for Automatic Accident Detection and Multimod...
Silva, Bruno Fernandes; Alam, Muhammad; Gomes, Vitor; Ferreira, Joaquim Castro; Oliveira, ArnaldoThe rapid technological growth is now providing global opportunities to enable intelligent transportation system (ITS) to tackle road traffic accidents which is considered one of the world’s largest public injury prevention problem. For this purpose, eCall is an initiative by EU with the purpose to bring rapid assistance to an accident location. This chapter 1 presents HDy Copilot, an application for acci- dent...
Mobile application for automatic accident detection and multimodal alert
Fernandes, Bruno; Gomes, Vitor; Ferreira, Joaquim; Oliveira, ArnaldoThis paper presents HDy Copilot, an Android application for accident detection integrated with multimodal alert dissemination, both via eCall and IEEE 802.11p. The proposed accident detection algorithm receives inputs from the vehicle, via ODB-II, and from the smartphone sensors, namely the accelerometer, the magnetometer and the gyroscope. The Android smartphone is also used as human machine interface, so that...
Reliable Delivery of Safety Messages in Infrastructure Based Vehicular Networks
Almeida, João; Alam, Muhammad; Fernandes, Bruno; Khan, Muhammad Awais; Oliveira, Arnaldo; Ferreira, Joaquim CastroIntelligent Transportation Systems (ITS) is an emerging paradigm which attracted massive research in the recent past to enhance the level of safety and efficiency of vehicular networks contributing to comfortable and safer roads. ITS applications and services have strict timelines constraints that must be met by the underline communication protocols in order to support deterministic real-time communications. Wh...
Supporting Deterministic Medium Access Control in Wireless Vehicular Communicat...
Cruz, Cristovão; Ferreira, Joaquim; Oliveira, ArnaldoThe medium access is regarded as being one of the most challenging issues to solve in order to provide de- terministic wireless communications in vehicular networks. It has been demonstrated that standard protocols fail to properly address this issue. The implementation of deterministic Medium Access Control (MAC) protocols is hampered by the fact that commercial devices do not allow modifications to the standa...
Microstrip antenna array for multiband dedicated short range communications sys...
Varum, Tiago; Matos, João; Pinho, Pedro; Abreu, Ricardo; Oliveira, Arnaldo; Lopes, JorgeDedicated Short Range Communications (DSRC) is the key enabling technology for the present and future vehicular communication for various applications, such as safety improvement and traffic jam mitigation. This paper describes the development of a microstrip antenna array for the roadside equipment of a DSRC system, whose characteristics are according with the vehicular communications standards. The proposed a...
Parameterizable CAN Switch implementation using FPGA
Faria, João; Madail, Samuel; Oliveira, ArnaldoThe Controller Area Network is a well known fieldbus commonly used in many distributed control systems. However, the original bus topology of CAN limits its usagein safety-critical and fault tolerant applications. In order toimprove its performance and allow its deployment in safetycritical applications, several CAN hubs and switches have been created, permitting the adoption of star-based topologies. This pape...