Performance Comparison of IEEE 802.1 TSN Time Aware Shaper (TAS) and Asynchronous Traffic Shaper (ATS)

The IEEE 802.1 time sensitive networking working group has recently standardized the time aware shaper (TAS). The TAS provides deterministic latency guarantees but requires tight time synchronization in all network switches. This paper thoroughly evaluates the mean and maximum packet delays and pack...

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Bibliographic Details
Published in:IEEE access 2019, Vol.7, p.44165-44181
Main Authors: Nasrallah, Ahmed, Thyagaturu, Akhilesh S., Alharbi, Ziyad, Wang, Cuixiang, Shao, Xing, Reisslein, Martin, Elbakoury, Hesham
Format: Article
Language:English
Subjects:
Asynchronous traffic shaper (ATS)
Automotive engineering
Delays
Ethernet
Job shop scheduling
Network latency
packet delay
Schedules
Switches
Synchronization
throughput
time aware shaper (TAS)
Time synchronization
time-sensitive networking (TSN)
ultra-low latency
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Summary:The IEEE 802.1 time sensitive networking working group has recently standardized the time aware shaper (TAS). The TAS provides deterministic latency guarantees but requires tight time synchronization in all network switches. This paper thoroughly evaluates the mean and maximum packet delays and packet losses of the TAS for a typical industrial control ring network for random (sporadic) and for periodic traffic. We propose and evaluate adaptive bandwidth sharing and adaptive slotted window mechanisms to make TAS adaptive to traffic fluctuations. This paper further evaluates the asynchronous traffic shaper (ATS), which has been proposed to provide low latency network service without the need for time synchronization in network nodes. Our evaluations indicate that TAS with proper configurations, e.g., accurate and precise gating schedules, generally achieves the specified latency bounds for both sporadic and periodic traffic. In contrast, ATS performs relatively well for sporadic traffic; but struggles for moderate to high loads of periodic traffic.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2908613