Yeni bir hataya dayanıklı gerçek zamanlı ethernet protokolü: Tasarım ve değerlendirme

This thesis is motivated by the communication requirements of contemporary real-time and embedded applications. These requirements are high-bandwidth, fault tolerance, determinism that allows schedulability and bounded latency, broadcast capability, accommodating sporadic traffic efficiently together with periodic traffic, and finally low cost, COTS interface hardware. To this end, we propose a novel protocol, Shared Queue based Dynamic Slot Reservation (SQDSR) complete with message format, medium access and fault tolerance mechanisms. SQDSR implements a time-slotted synchronized communication layer over shared medium 100 Mbps Ethernet. SQDSR exploits the shared medium for broadcast capability, distributed scheduling of messages and fault tolerance. Furthermore, no switches are required that reduce the cost of implementation. The performance of SQDSR is evaluated with OMNeT++ simulator with a realistic message set and node topology from an avionics application. To this end, we compare the performance of SQDSR to AFDX (Avionics Full-Duplex Switched Ethernet) which is a widely used Ethernet-based communication protocol. The evaluation results show that SQDSR fulfills the requirements of the contemporary real-time embedded applications.