Métricas de Confiabilidade para Análise Espaço-Temporal de Transmissões V2I em Ambientes Urbanos

• Bruno Y. L. Kimura
• Márcio V. Barbosa
• Roberto S. Yokoyama
• Valério Rosset

Resumo

In this paper, we evaluate the performance of a TCP client/server application from simulations of Drive-Thru Internet opportunistic access in public WiFi hotspots deployed on an urban environment. We observed that the use of Quality of Service (QoS) metrics for evaluating these distributed applications, when generalizing results, it leads to limited analysis of the quality of Vehicleto-Infrastructure (V2I) transmissions. To overcome such a limitation, we apply new metrics of evaluation such as connection interval, disconnection interval, connectivity rate, and connectivity intermittency rate, which are mapped into the well-known metrics of Dependable Computing such as MTTF, MTTR, Availability, and MTBF, respectively. When looking at the transmissions under the time and space of the vehicles' displacements, we verified that the metrics of dependability can complement and better justify the evaluation from traditional metrics of QoS and, therefore, provide a wider and deeper performance analysis about the quality of V2I transmissions.