24/09/2024
LaSiD marca presença no “XIV Symposium on Computing Systems Engineering (SBESC)”, em Recife, de 26 a 29 de novembro de 2024, com três artigos na trilha principal.
https://sbesc.lisha.ufsc.br/sbesc2024/Home
"Energy-Efficient eHealth Monitoring with LPWAN"
Marcelo Alves Guimarães and Raimundo José de Araújo Macêdo
This paper presents the design and development of a novel tool for collecting and transmitting clinical data over a Low Power Wide Area Network (LPWAN). The tool features custom-designed integration boards and power management mechanisms tailored explicitly for the cyclical operation of the integrated technologies. Prioritizing effective data transmission while minimizing energy consumption—a critical factor in healthcare applications—the tool employs two key strategies: (1) on/off circuitry for GPS and ECG components to conserve power, and (2) an adaptive power protocol that leverages message acknowledgments and the Received Signal Strength Indicator (RSSI) for dynamic transmission power adjustments. Real-world experiments conducted in a relatively dense environment provided valuable insights into the system's performance under realistic conditions, showing this to be a promising approach to saving energy and optimizing eHealth applications within cyber-physical distributed systems. The fully operational tool now serves as a valuable testbed for further developments in the e-health domain.
"The Age and Updating Stability for a Communication Context in VANET"
Margarete de Sá and Sérgio Gorender
VANETs make it possible to execute specific vehicular applications, in particular those with the aim of turning traffic safe and avoiding congestion. However, it is difficult to maintain communication between vehicles when these vehicles move dynamically at high speeds. Context-aware systems have been studied as a way to monitor context information from sensors, which can be used by systems to adapt to changes in their environment or in application requirements. This concept is used by VANET protocols and applications in different ways. Quality of Context (QoC) metrics are used to qualify the context information considering different characteristics of sensors and of the information, being a base for systems to decide if it is safe and interesting to use specific information. In this paper, we proposed QoC metrics related to the stability of a vehicular communication context. In addition, we also analyzed the Age QoC metric and showed how to calculate it for distinct context information. We simulated scenarios to verify the behavior of our QoC metrics. The results showed that the proposed QoC metrics can properly qualify the vehicular communication context.
"E-THeTA: An Efficient and Adaptive TDMA Approach for Wireless Body Area Networks"
Jorge Herculano, Luís Otávio de Andrade, Willians Pereira, and Alirio de Sa
Several research efforts have proposed adaptive solutions for Time Division Multiple Access (TDMA) to satisfy time requirements and save energy on Wireless Body Area Networks (WBANs) affected by radiofrequency interferences and carrying dynamic traffic. Even with the benefits, most of these solutions waste network bandwidth, decreasing network performance and the ability to recover from some unexpected communication conditions. This paper introduces the E-THeTA, an adaptive and efficient approach based on TDMA crafted to enhance performance, save energy, and efficiently use WBAN bandwidth. Compared to IEEE 802.15.4 and IEEE 802.15.6 standards and other adaptive approaches, the proposed solution reduces message losses, consumes less energy, and maintains low communication latencies in most evaluated scenarios.
XIV Symposium on Computing Systems Engineering
