calender
Date & Time
Search
Datum
{{range.dates[index].day}}
{{range.dates[index].date}}
Time
Mornings Noon Afternoons Evenings
  • from
  • to
  • o'clock
Topic
Event
Properties
{{item.name}}
{{item.name}}
Exhibition venue

(please choose the desired areas)

Lecture language
Format

Event database

The event database contains all event-related information for the digital electronica conference and supporting event program.

Back to the EventList

A Real-Time Seamless Handover Mechanism for WSNs in the IIoT

NOV
10
2020
10. NOV 2020

Lecture electronica Conferences > Wireless Congress > Session 4: Industrial

15:00-15:25 h | Virtual

Industry 4.0 and the Industrial Internet of Things (IIoT) foster the usage of wireless communication to achieve massive connectivity throughout the automation pyramid of the manufacturing industry. Especially the communication at the industrial edge between sensors/actuators and control devices such as programmable logic controllers (PLC) or IIoT gateways is critical, as the controlled manufacturing processes often require low latencies and hard real-time guarantees. Furthermore, the number of mobile applications in the manufacturing industry increases continuously, e.g. due to the introduction of automated guided vehicles (AGV) for logistic tasks and mobile or collaborative robots. Such technologies have a direct influence on the performance and behavior of the manufacturing processes and thus need to be integrated into the communication network of the control system. To satisfy the resulting demand for time-critical wireless communication in industrial sensor networks, the wired networking standard for automation IEC 61131-9 (IO-Link) was extended by the wireless communication protocol IO-Link Wireless. Like Bluetooth, the physical layer of IO-Link Wireless is based on the IEEE 802.15.1 standard but guarantees deterministic latencies and low packet error rates. IO-Link Wireless networks implement a star topology with a single master and up to 40 devices. For mobile applications, IO-Link Wireless offers a roaming solution based on the cellular network structure established by multiple masters. However, this solution compromises the real-time capability and reliability of the communication and prevents a seamless handover between the cells. In this paper, we review the IO-Link Wireless handover mechanism as specified in the standard from a real-time perspective, analyze how it limits the reliability of the protocol and develop an alternative roaming mechanism that enables a handover preserving the real-time communication during the transition between cells. We introduce a network-wide synchronization mechanism targeting the masters assigned to the cells of the network to provide a seamless handover. The evaluation of our approach is based on a modified protocol stack that implements the core functionalities of IO-Link Wireless and integrates our synchronization mechanism enabling the roaming approach. For the implementation of the communication and synchronization system, we use the SoC nRF52832 by Nordic Semiconductors. With the implemented protocol stack, we analyze the accuracy, CPU load and power consumption of our synchronization mechanism. Additionally, we perform a theoretical evaluation of the synchronization of a full network based on the results of the aforementioned experiments. In summary, we show that our synchronization mechanism with a maximum synchronization error of ±6.1 µs is more accurate than comparable solutions and capable of leveraging our roaming approach with a seamless handover between the cells of IO-Link Wireless masters.

Subjects: Wireless

Speaker: Lukas Krupp (Fraunhofer IMS)

Type: Lecture

Speech: English

Notifiable

Chargeable

Login

Industry 4.0 and the Industrial Internet of Things (IIoT) foster the usage of wireless communication to achieve massive connectivity throughout the automation pyramid of the manufacturing industry. Especially the communication at the industrial edge between sensors/actuators and control devices such as programmable logic controllers (PLC) or IIoT gateways is critical, as the controlled manufacturing processes often require low latencies and hard real-time guarantees. Furthermore, the number of mobile applications in the manufacturing industry increases continuously, e.g. due to the introduction of automated guided vehicles (AGV) for logistic tasks and mobile or collaborative robots. Such technologies have a direct influence on the performance and behavior of the manufacturing processes and thus need to be integrated into the communication network of the control system. To satisfy the resulting demand for time-critical wireless communication in industrial sensor networks, the wired networking standard for automation IEC 61131-9 (IO-Link) was extended by the wireless communication protocol IO-Link Wireless. Like Bluetooth, the physical layer of IO-Link Wireless is based on the IEEE 802.15.1 standard but guarantees deterministic latencies and low packet error rates. IO-Link Wireless networks implement a star topology with a single master and up to 40 devices. For mobile applications, IO-Link Wireless offers a roaming solution based on the cellular network structure established by multiple masters. However, this solution compromises the real-time capability and reliability of the communication and prevents a seamless handover between the cells. In this paper, we review the IO-Link Wireless handover mechanism as specified in the standard from a real-time perspective, analyze how it limits the reliability of the protocol and develop an alternative roaming mechanism that enables a handover preserving the real-time communication during the transition between cells. We introduce a network-wide synchronization mechanism targeting the masters assigned to the cells of the network to provide a seamless handover. The evaluation of our approach is based on a modified protocol stack that implements the core functionalities of IO-Link Wireless and integrates our synchronization mechanism enabling the roaming approach. For the implementation of the communication and synchronization system, we use the SoC nRF52832 by Nordic Semiconductors. With the implemented protocol stack, we analyze the accuracy, CPU load and power consumption of our synchronization mechanism. Additionally, we perform a theoretical evaluation of the synchronization of a full network based on the results of the aforementioned experiments. In summary, we show that our synchronization mechanism with a maximum synchronization error of ±6.1 µs is more accurate than comparable solutions and capable of leveraging our roaming approach with a seamless handover between the cells of IO-Link Wireless masters.

Speaker,
Fraunhofer IMS

Lukas Krupp

Lukas Krupp

Fraunhofer IMS

Show Profile

Informations

Speaker,
Fraunhofer IMS

Lukas Krupp
Lukas Krupp

Location

Eingang
Nord-West
ICM
Eingang
Nord
Eingang
West
Atrium
Eingang
Nord-Ost
Eingang
Ost
Conference
Center Nord
Freigelände
C1
C2
C3
C4
C5
C6
B0
B1
B2
B3
B4
B5
B6
A1
A2
A3
A4
A5
A6

More Events