Improving Effectiveness of Seamless Redundancy in Real Industrial Wi-Fi Networks

Reliability and determinism of Wi-Fi can be tangibly improved by means of seamless redundancy, to the point of making this technology suitable for industrial environments. As pointed out in recent papers, the most benefits can be achieved when no phenomena can simultaneously affect transmissions on all channels of a redundant link. In this paper, several aspects are analyzed which, if not properly counteracted, may worsen seamless redundancy effectiveness. Effects they cause on communication have been experimentally evaluated in real testbeds, which rely on commercial Wi-Fi devices. Then, practical guidelines are provided, which aim at preventing joint interference through a careful system design. Results show that measured communication quality can be made as good as expected in theory.

[1]  Andreas Willig,et al.  Retransmission Strategies for Cyclic Polling Over Wireless Channels in the Presence of Interference , 2009, IEEE Transactions on Industrial Informatics.

[2]  Gianluca Cena,et al.  A software-defined MAC architecture for Wi-Fi operating in user space on conventional PCs , 2017, 2017 IEEE 13th International Workshop on Factory Communication Systems (WFCS).

[3]  Paolo Attilio Pegoraro,et al.  A Distributed PMU for Electrical Substations With Wireless Redundant Process Bus , 2015, IEEE Transactions on Instrumentation and Measurement.

[4]  Gianluca Cena,et al.  Dynamic duplicate deferral techniques for redundant Wi-Fi networks , 2014, Proceedings of the 2014 IEEE Emerging Technology and Factory Automation (ETFA).

[5]  Gianluca Cena,et al.  On the Performance of IEEE 802.11e Wireless Infrastructures for Soft-Real-Time Industrial Applications , 2010, IEEE Transactions on Industrial Informatics.

[6]  Ramez M. Daoud,et al.  Simulation of parallel redundant WLAN with OPNET , 2013, 2013 IEEE 18th Conference on Emerging Technologies & Factory Automation (ETFA).

[7]  Henning Trsek,et al.  An isochronous medium access for real-time wireless communications in industrial automation systems - A use case for wireless clock synchronization , 2011, 2011 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication.

[8]  Thierry Gayraud,et al.  Design and analysis of UWB-based network for reliable and timely communications in safety-critical avionics , 2014, 2014 10th IEEE Workshop on Factory Communication Systems (WFCS 2014).

[9]  Andreas Willig,et al.  Recent and Emerging Topics in Wireless Industrial Communications: A Selection , 2008, IEEE Transactions on Industrial Informatics.

[10]  Ramez M. Daoud,et al.  Novel system architecture for railway wireless communications , 2017, IEEE EUROCON 2017 -17th International Conference on Smart Technologies.

[11]  Michele Luvisotto,et al.  Performance assessment of an IEEE 802.11-based protocol for real-time communication in agriculture , 2014, Proceedings of the 2014 IEEE Emerging Technology and Factory Automation (ETFA).

[12]  Miroslav Popovic,et al.  iPRP—The Parallel Redundancy Protocol for IP Networks: Protocol Design and Operation , 2016, IEEE Transactions on Industrial Informatics.

[13]  Markus Rentschler,et al.  Towards a reliable parallel redundant WLAN black channel , 2012, 2012 9th IEEE International Workshop on Factory Communication Systems.

[14]  Miroslav Popovic,et al.  Experimental validation of the usability of Wi-Fi over redundant paths for streaming phasor data , 2016, 2016 IEEE International Conference on Smart Grid Communications (SmartGridComm).

[15]  Gianluca Cena,et al.  Design guidelines to improve reliability of seamless redundancy in Wi-Fi networks , 2016, 2016 IEEE 21st International Conference on Emerging Technologies and Factory Automation (ETFA).

[16]  Vijanth S. Asirvadam,et al.  Adopting EWMA Filter on a Fast Sampling Wired Link Contention in WirelessHART Control System , 2016, IEEE Transactions on Instrumentation and Measurement.

[17]  Gianluca Cena,et al.  Hybrid wired/wireless networks for real-time communications , 2008, IEEE Industrial Electronics Magazine.

[18]  S. Carlsen,et al.  WirelessHART Versus ISA100.11a: The Format War Hits the Factory Floor , 2011, IEEE Industrial Electronics Magazine.

[19]  Gianluca Cena,et al.  Enhancing Communication Determinism in Wi-Fi Networks for Soft Real-Time Industrial Applications , 2017, IEEE Transactions on Industrial Informatics.

[20]  Yu-Chu Tian,et al.  A Deadline-Constrained 802.11 MAC Protocol With QoS Differentiation for Soft Real-Time Control , 2016, IEEE Transactions on Industrial Informatics.

[21]  Gianluca Cena,et al.  Evaluation of Response Times in Industrial WLANs , 2007, IEEE Transactions on Industrial Informatics.

[22]  Gianluca Cena,et al.  Seamless Link-Level Redundancy to Improve Reliability of Industrial Wi-Fi Networks , 2016, IEEE Transactions on Industrial Informatics.

[23]  Gianluca Cena,et al.  Duplication avoidance mechanisms to reduce bandwidth usage in redundant Wi-Fi networks , 2017, 2017 IEEE 13th International Workshop on Factory Communication Systems (WFCS).

[24]  Gianluca Cena,et al.  An enhanced MAC to increase reliability in redundant Wi-Fi networks , 2014, 2014 10th IEEE Workshop on Factory Communication Systems (WFCS 2014).

[25]  A. Zubow,et al.  The Impact of Adjacent Channel Interference in Multi-Radio Systems using IEEE 802.11 , 2008, 2008 International Wireless Communications and Mobile Computing Conference.

[26]  Gianluca Cena,et al.  Experimental Evaluation of Seamless Redundancy Applied to Industrial Wi-Fi Networks , 2017, IEEE Transactions on Industrial Informatics.

[27]  José Alberto Fonseca,et al.  VTP-CSMA: A Virtual Token Passing Approach for Real-Time Communication in IEEE 802.11 Wireless Networks , 2007, IEEE Transactions on Industrial Informatics.

[28]  Henning Trsek,et al.  Clock Synchronization Over IEEE 802.11—A Survey of Methodologies and Protocols , 2017, IEEE Transactions on Industrial Informatics.