19 research outputs found
Reserva de recursos em automotive ethernet
Mestrado em Engenharia Electrónica e TelecomunicaçõesIn recent years, automotive industry has undergone major changes, being
able to highlight not only the growing development of electronic systems in
increasingly and varied features and contexts, as well as to cope with its
growing interaction between with the driver and the outside world. Due to the
huge amount of traffic involved in these system communications, networking
technologies used so far are starting to be less appealing and the industry
began to consider alternatives, economically more competitive as is the case
of Ethernet. The use of Ethernet technology in automotive domains faces
some challenges, namely with time constraints compliance and well defined
resource requirements.
The emergence of AVB (Audio Video Bridging) protocols, is trying to
tackle some of these problems of having dynamic Quality of Service management
in automotive Ethernet networks. One example of such protocols is the
signalling protocol (SRP Stream Reservation Protocol), which could be used
for providing a resource reservation mechanism in an automotive Ethernet
domain.
To test the feasibility of such recent methods, simulation tools are of
paramount importance. This work presents an implementation of the SRP
(Stream Reservation Protocol) in Omnet++, taking into account some
of its constraints. It is described the fundamental aspects of this model
implementation, as well as some functional tests.Nos últimos anos, a industria automóvel tem sofrido grandes evoluções,
podendo-se destacar não só o crescente desenvolvimento de sistemas
eletrónicos em contextos e funcionalidades cada vez mais variados, como
também a crescente interacção deste com o condutor e o mundo exterior.
Devido ao enorme aumento de tráfego envolvido nas comunicações que compõem
esses sistemas, as tecnologias de redes usadas até então deixaram de
ser tão apelativas e passaram-se a considerar alternativas económicamente
mais competitivas como é o caso da Ethernet. O uso de redes Ethernet em
âmbito automóvel levanta alguns problemas, nomeadamente no cumprimento
de limites temporais e requisitos de recursos bem definidos.
O aparecimento de protocolos AVB (Audio Video Bridging) vem tentar
colmatar vários problemas de gestão dinâmica de Qualidade de Serviço
das redes Ethernet no domÃnio automóvel. O protocol de sinalização SRP
(Stream Reservation Protocol) pode ser adaptado para redes Ethernet no
contexto automóvel para proporcionar um mecanismo de reserva de recursos.
Para testar a viabilidade de métodos tão recentes, as ferramentes de
simulação são de uma importância vital. Este trabalho apresententa uma
implemetação do protocolo SRP (Stream Reservation Protocol) em ambiente
de simulação OMNeT++. São apresentados os aspectos fundamentais do
modelo implemetado bem como alguns testes funcionais de validação deste
Automotive Ethernet architecture and security: challenges and technologies
Vehicle infrastructure must address the challenges posed by today's advances toward connected and autonomous vehicles. To allow for more flexible architectures, high-bandwidth connections and scalability are needed to connect many sensors and electronic control units (ECUs). At the same time, deterministic and low latency is a critical and significant design requirement to support urgent real-time applications in autonomous vehicles. As a recent solution, the time-sensitive network (TSN) was introduced as Ethernet-based amendments in IEEE 802.1 TSN standards to meet those needs. However, it had hurdle to be overcome before it can be used effectively. This paper discusses the latest studies concerning the automotive Ethernet requirements, including transmission delay studies to improve worst-case end-to-end delay and end-to-end jitter. Also, the paper focuses on the securing Ethernet-based in-vehicle networks (IVNs) by reviewing new encryption and authentication methods and approaches