Avaliação experimental do protocolo RT-WiFi em ambientes abertos
Networks known as WiFi (IEEE 802.11 standard) are widely used in applications ranging from simple home environments systems to complex control systems network. However, the extensions incorporated into the standard to provide Quality of Service (QoS) are still unable to guarantee time constraints for real-time (RT) communications requirements. This paper presents an experimental validation of the RT-WiFi protocol that was recently proposed and analyzed through simulation. The experimental results demonstrate the feasibility of implementing the RT-WiFi protocol and improving the QoS level of communications through a comparative analysis with the EDCA mechanism, which is a mechanism incorporated in the IEEE 802.11 standard to provide different levels of transmission priority of different types of traffic.
Cena, G., Seno, L., Valenzano, A., and Zunino, C. (2010). On the performance of IEEE 802.11e wireless infrastructures for soft-real-time industrial applications. IEEE Transactions on Industrial Informatics, 6(3):425–437.
Costa, R., Portugal, P., Moraes, R., and Vasques, F. (2012a). An admission control mechanism to handle real-time traffic in IEEE 802.11 networks in open communication environments. In 9th IEEE International Workshop on Factory Communication Systems (WFCS), pages 63–66.
Costa, R., Portugal, P., Vasques, F., and Moraes, R. (2010). A TDMA-based mechanism for real-time communication in IEEE 802.11 e networks. In IEEE Conference on Emerging Technologies and Factory Automation (ETFA), pages 1–9.
Costa, R., Portugal, P., Vasques, F., and Moraes, R. (2012b). Comparing RT-WiFi and HCCA approaches to handle real-time traffic in open communication environments. In IEEE 17th Conference on Emerging Technologies & Factory Automation (ETFA), pages 1–8.
Costa, R., Portugal, P., Vasques, F., Moraes, R., and Cust´odio, R. F. (2011). A coordination layer to handle real-time communication in Wi-Fi networks with uncontrolled traffic sources. In IEEE 36th Conference on Local Computer Networks (LCN), pages 263–266.
Da Xu, L., He, W., and Li, S. (2014). Internet of things in industries: A survey. IEEE Transactions on industrial informatics, 10(4):2233–2243.
Han, S., Mok, A. K., Meng, J., Wei, Y.-H., Huang, P.-C., Leng, Q., Zhu, X., Sentis, L., Kim, K. S., and Miikkulainen, R. (2013). Architecture of a cyberphysical avatar. In Proceedings of the ACM/IEEE 4th International Conference on Cyber-Physical Systems, pages 189–198.
Li, B., Sun, Z., Mechitov, K., Hackmann, G., Lu, C., Dyke, S. J., Agha, G., and Spencer, B. F. (2013). Realistic case studies of wireless structural control. In ACM/IEEE International Conference on Cyber-Physical Systems (ICCPS), pages 179–188.
Mangold, S., Choi, S., Hiertz, G. R., Klein, O., and Walke, B. (2003). Analysis of IEEE 802.11 e for QoS support in wireless LANs. IEEE wireless communications, 10(6):40– 50.
Moraes, R., Portugal, P., and Vasques, F. (2006). Simulation analysis of the IEEE 802.11 e EDCA protocol for an industrially-relevant real-time communication scenario. In IEEE Conference on Emerging Technologies and Factory Automation (ETFA), pages 202–209.
Moraes, R., Vasques, F., Portugal, P., and Souto, P. F. (2010). A forcing collision resolution approach able to prioritize traffic in CSMA-based networks. Computer Communications, 33(1):54–64.
Song, J., Han, S., Mok, A., Chen, D., Lucas, M., Nixon, M., and Pratt, W. (2008). WirelessHART: Applying wireless technology in real-time industrial process control. In IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS’08), pages 377–386.
Wei, Y.-H., Leng, Q., Han, S., Mok, A. K., Zhang, W., and Tomizuka, M. (2013). RTWiFi: Real-time high-speed communication protocol for wireless cyber-physical control applications. In IEEE 34th Real-Time Systems Symposium (RTSS), pages 140–149.
Zhang, W., Zhu, X., Han, S., Byl, N., Mok, A. K., and Tomizuka, M. (2012). Design of a network-based mobile gait rehabilitation system. In IEEE International Conference on Robotics and Biomimetics (ROBIO), pages 1773–1778.