Program - Day 3

Wednesday, 29th April 2020

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Session 19: Registration / SETUP

Session 20: Keynote Speaker Eduardo Tovar (CISTER Embedded Computing Systems Center, Portugal)

Keynote "Information Processing for Extreme Dense Sensing: Timeliness and Scalability Issues"

Chair: Ramez Daoud

YouTube Video

Large-scale and dense sensor/actuator deployments pose fundamental challenges concerning both interconnectivity and processing of huge quantities of information. Think about the simple example of obtaining the minimum value among cents of sensor readings. Or think about the more sophisticated active flow control application where through proper modulation of aircraft skin surfaces a significant reduction of drag and related fuel consumption (and emissions) may be attained. Currently available approaches for data processing in such large-scale very dense deployments of sensors lead to energy-waste and long response-times from sensing to actuation. This talk will address emerging techniques that are able to allow scalable and efficient data processing in large-scale dense cyber-physical systems.

Session 21: BREAK / Preparing next Session

Session 22: Wireless Communications

Chair: Gianluca Cena

YouTube PlayList

Functional QoS Metric for LoRaWAN Applications in Challenging Industrial Environment

Che Cameron, Wasif Naeem and Kang Li
Presenter: Che Cameron

YouTube Video

A functional QoS metric (F-QoS) is presented to assess the quality of time series data transmitted from a wireless sensor network (WSN) in terms of suitability for resampling at specified rates, with a bounded acceptable level of missing measurements.
The F-QoS classification is applied to 14 full days of data from a LoRa network installed in a commercial bakery with the Packet Delivery Rate (PDR) metric provided for comparison. Network links are strained by large metal obstructions and the endpoints are installed inside metal cabinets to provide a challenging environment.

Observers and Predictors for Wireless Control Loops published preprintBest Presentation Award (Regular Paper)

Linda Patricia Osuna-Ibarra, David Gomez Gutierrez, Dave Cavalcanti and Humberto Caballero-Barragan
Presenter: Linda Patricia Osuna-Ibarra

YouTube Video

The present work was conceived with the goal of diminishing the effects of wireless communication latency in time-sensitive networks. It takes advantage of modern approaches that offer a bounded latency but focuses on the methods to cope with the non-deterministic delays introduced by the latency.
An observer-predictor scheme module is proposed, designed and added in the control loop to prevent the performance degradation when the wired network is replaced by a wireless network and to allow, up to some extent, the use of the same controller that was being used while wired. This module may exploit information provided by the wireless communication devices, such as on the expected latency, the timestamp, and the time synchronization along the network.
The proposed module allows the controller to have a performance similar as when in a wired network. This enables wireless networked control in systems with low time constants (i.e. time-sensitive).
Lab experiments are presented in real-time to illustrate the observer-predictor scheme module proposed. Finally, the conclusions and future work are presented.

Portable Full Channel Sounder for Mobile Robotics by Using Sub-Nanosecond Time Synchronization over Wireless

Óscar Seijo, Jesús A. López-Fernández and Iñaki Val
Presenter: Óscar Seijo

YouTube Video

Wireless communications have attracted great interest from the industry due to its lower cost and the possibility of enabling new use cases. The new use cases are commonly related to mobile robotics, such as Unmanned Aerial Vehicles. The design of wireless systems for these use cases requires deep knowledge of the channel behavior. However, the weight and size of full channel sounders exceed the payload of most mobile robots. In addition, full channel sounders usually require wired time synchronization. Hence, channel measurements in these scenarios are constrained to use low-end channel sounders, which can only measure some specific parameters (frame error rate, channel attenuation, etc.). In this paper, we present the design and implementation of a portable 802.11-based channel sounder combined with a sub-nanosecond wireless time synchronization algorithm. Thanks to the wireless time synchronization, the channel sounder can be used to periodically take complex baseband Channel Impulse Response samples synchronized to absolute time. From these samples, relevant channel parameters can be extracted, including the Power Delay Profile, Doppler spectrum, and channel delay. The verification of the channel sounder through a wireless channel emulator confirms its feasibility for mobile robotics applications.

Performance analysis of STDMA and RA-TDMA wireless protocols in industrial scenarios

Iñaki Val, Zaloa Fernandez and Luis Almeida
Presenter: Luis Almeida

YouTube Video

With the Industry 4.0 revolution, the inclusion of wireless communications with real-time requirements has been gaining popularity in industrial applications. As existing wireless technologies do not fully satisfy the stringent requirements of the most critical industrial applications, wired, centralized networks are often used. However, when the application requires mobility, there is no other way than to use wireless communications. Further, in applications where the topology changes dynamically and a large number of devices are mobile, centralized protocols are less suitable. Unfortunately, most decentralized medium access protocols are not predictable, and thereby not able to fulfil the real-time requirements. To address these challenges, in this paper Self-Organizing Time Division Multiple Access (STDMA) and Reconfigurable and Adaptive Time Division Multiple Access (RA-TDMA) are analysed to assess its suitability for use in industrial applications. The analysis has been carried out through simulations under a multipath dispersed time-variant industrial channel while subject to a variable Doppler shift. To this end, several metrics such as packet losses and packet inter-arrival time (PIAT) have been evaluated using OMNeT++ in combination with the VEINS framework.

Session 23: Closing Session

Chair: Luis Almeida

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