19831
2020
eng
report
1
2020-01-20
--
--
Technical Report on Bridge-Local Guaranteed Latency with Strict Priority Scheduling
Bridge-local latency computation is often regarded with caution, as historic efforts with the Credit-Based Shaper (CBS) showed that CBS requires network wide information for tight bounds. Recently, new shaping mechanisms and timed gates were applied to achieve such guarantees nonetheless, but they require support for these new mechanisms in the forwarding devices.
This document presents a per-hop latency bound for individual streams in a class-based network that applies the IEEE 802.1Q strict priority transmission selection algorithm. It is based on self-pacing talkers and uses the accumulated latency fields during the reservation process to provide upper bounds with bridge-local information. The presented delay bound is proven mathematically and then evaluated with respect to its accuracy. It indicates the required information that must be provided for admission control, e.g., implemented by a resource reservation protocol such as IEEE 802.1Qdd. Further, it hints at potential improvements regarding new mechanisms and higher accuracy given more information.
urn:nbn:de:bvb:20-opus-198310
Siemens AG
false
true
CC BY-SA: Creative-Commons-Lizenz: Namensnennung, Weitergabe unter gleichen Bedingungen 4.0 International
Alexej Grigorjew
Florian Metzger
Tobias Hoßfeld
Johannes Specht
Franz-Josef Götz
Jürgen Schmitt
Feng Chen
deu
swd
Echtzeit
deu
swd
Rechnernetz
deu
swd
Latenz
deu
swd
Ethernet
eng
uncontrolled
Latency Bound
eng
uncontrolled
Formal analysis
Informatik, Informationswissenschaft, allgemeine Werke
GENERAL
open_access
Institut für Informatik
Universität Würzburg
https://opus.bibliothek.uni-wuerzburg.de/files/19831/Grigorjew_Guaranteed_Latency_Technical_Report.pdf
20582
2020
eng
8
report
1
2020-06-10
--
--
Asynchronous Traffic Shaping with Jitter Control
Asynchronous Traffic Shaping enabled bounded latency with low complexity for time sensitive networking without the need for time synchronization. However, its main focus is the guaranteed maximum delay. Jitter-sensitive applications may still be forced towards synchronization. This work proposes traffic damping to reduce end-to-end delay jitter. It discusses its application and shows that both the prerequisites and the guaranteed delay of traffic damping and ATS are very similar. Finally, it presents a brief evaluation of delay jitter in an example topology by means of a simulation and worst case estimation.
10.25972/OPUS-20582
urn:nbn:de:bvb:20-opus-205824
Siemens AG
University of Duisburg-Essen
false
true
CC BY-SA: Creative-Commons-Lizenz: Namensnennung, Weitergabe unter gleichen Bedingungen 4.0 International
Alexej Grigorjew
Florian Metzger
Tobias Hoßfeld
Johannes Specht
Franz-Josef Götz
Feng Chen
Jürgen Schmitt
deu
swd
Echtzeit
deu
swd
Rechnernetz
deu
swd
Latenz
deu
swd
Ethernet
eng
uncontrolled
TSN
eng
uncontrolled
jitter
eng
uncontrolled
traffic damping
Informatik, Informationswissenschaft, allgemeine Werke
open_access
Institut für Informatik
Universität Würzburg
https://opus.bibliothek.uni-wuerzburg.de/files/20582/atsplus.pdf