A proposal for enhancement towards bidirectional quasi-deterministic communications using IEEE 802.15.4

Dariz, Luca; Ruggeri, Massimiliano; Malaguti, Giorgio

doi:10.1109/telfor.2013.6716242

Cited by 8 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reference implementation is based on a commercial off-the-shelf wireless sensor network module, the Zolertia Z1, with a 16-bit RISC microcontroller (MSP430) running at 16 MHz. The implementation presents some optimizations compared to the standard LLDN mode that reduce the maximum worst-case latency of the communication on the wireless channel and the time of system configuration; conversely the number of nodes that can be connected to the network with the same performance are also reduced [39][40][41].…”

Section: Software Stack For Real-time Wireless Sensor Network In the Ncsmentioning

confidence: 99%

Systemic Approach for the Definition of a Safer Human-Robot Interaction

Pecora

Maiolo

Minotti

et al. 2019

Factories of the Future

Self Cite

View full text Add to dashboard Cite

Smart factories must speed up their processes to face new manufacturing challenges and, at the same time, demonstrate an extremely high degree of flexibility to reduce production costs and time. This kind of issues can be addressed by the cooperation between humans and robots in a mixed human-robot working environment. Robots have the compelling advantage of spatial precision and repeatability as well as the capability of applying defined forces. Humans, on the other hand, are especially skilled at complex manipulations and adapting to changing task requirements. In this complicate scenario of co-shared workplace and continuous human-robot interaction, safety strategies are a key requirement to avoid possible injuries to humans or fatal accidents. This chapter proposes a systemic approach to respond to these requirements. The approach merges and manages multiple sensing sources, redundant transmission protocols and software decision mechanisms, aiming to guarantee a continuous and reconfigurable co-share scenario that enables an operative interaction between human workers and robots in a controlled and safe environment. Furthermore, new technological solutions and innovative methodologies are presented for the definition of a safer workplace in human-robot interaction scenarios. 8.1 Scientific and Industrial Motivations The need to face the production of complex families of product, with short life cycles, often characterized by strongly variable production patterns, requires factories to be able to quickly evolve and reconfigure [1]. These reconfigurable factories

show abstract

Section: Software Stack For Real-time Wireless Sensor Network In the Ncsmentioning

confidence: 99%

Systemic Approach for the Definition of a Safer Human-Robot Interaction

Pecora

Maiolo

Minotti

et al. 2019

Factories of the Future

Self Cite

View full text Add to dashboard Cite

show abstract

“…Patti et al in [4] proposes multichannel LLDN to enable communication between the nodes in the different channel, i.e., to increase the scalability of the network. Dairz et al in [5] proposes an enhancement to LLDN mode and evaluate the performance of LLDN analytically. Achim et al in [6] suggests a retransmission mode to save the energy consumption by 33% and reduces the packet loss by 40%.…”

Section: Literature Surveymentioning

confidence: 99%

A Novel Channel Access Mechanism for IEEE 802.15.4e to Promote Internet of Things

Kumar*,

Kumar

2019

IJITEE

View full text Add to dashboard Cite

IEEE 802.15.4e defines the specification of PHY layer and MAC layer. Although distinguished by its popularity and strength for Wireless Sensor Networks (WSNs), it still suffers from several limitations that deteriorates its performance. One such restriction is a high collision probability that degrades the performance of a dense network. In this article, we develop a Slotted Access Window (SAW) mechanism, a medium access technique to mitigate high collision probability and energy consumption in dense and battery constrained networks. An accurate analytical model is presented to assess the effectiveness of SAW mechanism and validated using the ns-3 simulator. Finally, results show that the SAW mechanism significantly improves the throughput, energy efficiency, and delay in contrast to the default medium access mechanism.

show abstract

“…The work in [9] proposes to append n+3 bytes to the beacon frame, where n is the overall number of timeslots in a superframe, in order to embed the information needed for handling different traffic classes. However such an approach increases the beacon frame overhead.…”

Section: Related Workmentioning

confidence: 99%

“…Both the works [9] and [10] show that the cycle time grows linearly with the number of nodes. This is natural as, according the LLDN profile, each new node requires at least one additional timeslot and, consequently, the superframe length grows, thus increasing the cycle time too.…”

Section: Related Workmentioning

confidence: 99%

Introducing multi-level communication in the IEEE 802.15.4e protocol: The MultiChannel-LLDN

Patti

Alderisi

Bello

2014

Proceedings of the 2014 IEEE Emerging Technology and Factory Automation (ETFA)

View full text Add to dashboard Cite

The Low Latency Deterministic Network (LLDN) protocol is defined in the IEEE 802.15.4e, which is an amendment to the IEEE 802.15.4 standard specifically devised to support the requirements of industrial applications. The LLDN provides a TDMA-based medium access mechanism in which the network cycle time grows linearly with the number of nodes. As a result, to offer low cycle times to applications requiring a high number of nodes, the LLDN specifications suggest to create multiple networks operating on different channels by embedding multiple transceivers in the coordinator. However, such an approach entails high costs and increases the design complexity. Moreover, the LLDN protocol foresees a star topology that limits the network area coverage. This paper proposes a novel approach, called a MultiChannel_LLDN, based on a hierarchical network structure in which nodes communicate on different channels at the same time. The approach supports a high number of network nodes while maintaining short cycle times without the need for multiple transceivers in the coordinator and also provides backward compatibility with the standard LLDN. The paper presents the MultiChannel_LLDN and comparative performance assessments.

show abstract

A proposal for enhancement towards bidirectional quasi-deterministic communications using IEEE 802.15.4

Cited by 8 publications

References 5 publications

Systemic Approach for the Definition of a Safer Human-Robot Interaction

Systemic Approach for the Definition of a Safer Human-Robot Interaction

A Novel Channel Access Mechanism for IEEE 802.15.4e to Promote Internet of Things

Introducing multi-level communication in the IEEE 802.15.4e protocol: The MultiChannel-LLDN

Contact Info

Product

Resources

About