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Evaluating the suitability of IEEE 802.11ah for low-latency time-critical control loops

Amina Seferagic (UGent) , Ingrid Moerman (UGent) , Eli De Poorter (UGent) and Jeroen Hoebeke (UGent)
(2019) IEEE INTERNET OF THINGS JOURNAL. 6(5). p.7839-7848
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Abstract
A number of industrial wireless technologies have emerged over the last decade, promising to replace the need for wires in a variety of use cases. Except for customized time division multiple access (TDMA)-based wireless technologies that can achieve ultralow latency over a very limited area, wireless communication generally has reliability and latency issues when it comes to industrial applications. Closed loop communication requires high reliability (over 99%), limited jitter and latency, which poses a challenge especially over a wide area measuring in hundreds of meters. Extended coverage is promised with the advent of sub-GHz technologies, one of them being IEEE 802.11ah which is the only one that offers sufficient data rate for frequent bidirectional communication. Thus, we evaluated IEEE 802.11ah for low-latency time-critical control loops. We propose the network setup for adjusting the network dynamics to that of control loops, enabling limited jitter and high reliability. We explore the scalability of IEEE 802.11ah network hosting both control loops and monitoring sensors that periodically transmit measurements. Assigning the control loop end-nodes to dedicated restricted access window (RAW) slot results in over 99.99% successful deliveries. Furthermore, interpacket delay is concentrated around the cycle-time in the following or preceding beacon interval in case the beacon interval is at least half the value of the shortest cycle-time. Adjusting the beacon interval to the fastest control loop in the network ensures latency requirements at the cost of maximum achievable throughput and energy consumption.
Keywords
IEEE 802.11ah, IIoT, M2M communication, Wi-Fi HaLow, wireless control loop

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Citation

Please use this url to cite or link to this publication:

MLA
Seferagic, Amina, et al. “Evaluating the Suitability of IEEE 802.11ah for Low-Latency Time-Critical Control Loops.” IEEE INTERNET OF THINGS JOURNAL, vol. 6, no. 5, 2019, pp. 7839–48.
APA
Seferagic, A., Moerman, I., De Poorter, E., & Hoebeke, J. (2019). Evaluating the suitability of IEEE 802.11ah for low-latency time-critical control loops. IEEE INTERNET OF THINGS JOURNAL, 6(5), 7839–7848.
Chicago author-date
Seferagic, Amina, Ingrid Moerman, Eli De Poorter, and Jeroen Hoebeke. 2019. “Evaluating the Suitability of IEEE 802.11ah for Low-Latency Time-Critical Control Loops.” IEEE INTERNET OF THINGS JOURNAL 6 (5): 7839–48.
Chicago author-date (all authors)
Seferagic, Amina, Ingrid Moerman, Eli De Poorter, and Jeroen Hoebeke. 2019. “Evaluating the Suitability of IEEE 802.11ah for Low-Latency Time-Critical Control Loops.” IEEE INTERNET OF THINGS JOURNAL 6 (5): 7839–7848.
Vancouver
1.
Seferagic A, Moerman I, De Poorter E, Hoebeke J. Evaluating the suitability of IEEE 802.11ah for low-latency time-critical control loops. IEEE INTERNET OF THINGS JOURNAL. 2019;6(5):7839–48.
IEEE
[1]
A. Seferagic, I. Moerman, E. De Poorter, and J. Hoebeke, “Evaluating the suitability of IEEE 802.11ah for low-latency time-critical control loops,” IEEE INTERNET OF THINGS JOURNAL, vol. 6, no. 5, pp. 7839–7848, 2019.
@article{8639319,
  abstract     = {A number of industrial wireless technologies have emerged over the last decade, promising to replace the need for wires in a variety of use cases. Except for customized time division multiple access (TDMA)-based wireless technologies that can achieve ultralow latency over a very limited area, wireless communication generally has reliability and latency issues when it comes to industrial applications. Closed loop communication requires high reliability (over 99%), limited jitter and latency, which poses a challenge especially over a wide area measuring in hundreds of meters. Extended coverage is promised with the advent of sub-GHz technologies, one of them being IEEE 802.11ah which is the only one that offers sufficient data rate for frequent bidirectional communication. Thus, we evaluated IEEE 802.11ah for low-latency time-critical control loops. We propose the network setup for adjusting the network dynamics to that of control loops, enabling limited jitter and high reliability. We explore the scalability of IEEE 802.11ah network hosting both control loops and monitoring sensors that periodically transmit measurements. Assigning the control loop end-nodes to dedicated restricted access window (RAW) slot results in over 99.99% successful deliveries. Furthermore, interpacket delay is concentrated around the cycle-time in the following or preceding beacon interval in case the beacon interval is at least half the value of the shortest cycle-time. Adjusting the beacon interval to the fastest control loop in the network ensures latency requirements at the cost of maximum achievable throughput and energy consumption.},
  author       = {Seferagic, Amina and Moerman, Ingrid and De Poorter, Eli and Hoebeke, Jeroen},
  issn         = {2327-4662},
  journal      = {IEEE INTERNET OF THINGS JOURNAL},
  keywords     = {IEEE 802.11ah,IIoT,M2M communication,Wi-Fi HaLow,wireless control loop},
  language     = {eng},
  number       = {5},
  pages        = {7839--7848},
  title        = {Evaluating the suitability of IEEE 802.11ah for low-latency time-critical control loops},
  url          = {http://dx.doi.org/10.1109/JIOT.2019.2916579},
  volume       = {6},
  year         = {2019},
}

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