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Synchronizing TSN Devices via 802.1AS over 5G Networks

  • The 3GPP release 16 integrates TSN functionality into 5G and standardizes various options for TSN time synchronization over 5G such as transparent mode and bridge mode. The time domains for the TSN network and the 5G network are kept separate with an option to synchronize either of the networks to the other. The TSN time synchronization over 5G is possible either by using the IEEE 1588 generalized Precision Time Protocol (gPTP) based on UDP/IP multicast or via IEEE 802.1AS based on Ethernet PDUs. The INET and Simu5G simulation frameworks, which are both based on the OMNeT++ discrete event simulator, are widely used for simulating TSN and 5G networks. The INET framework comprises the 802.1AS based time synchronization mechanism, and Simu5G provides the 5G user plane carrying IP PDUs. We modified the 802.1AS-based synchronization model of INET so that it works over UDP/IP. With that, it is possible to synchronize TSN slaves (connected to 5G UEs), across a 5G network, with a TSN master clock, present within a TSN network, that is connected to the 5G core network. Our simulation results show that 500 microseconds of synchronization accuracy can be achieved with the corrected asymmetric propagation delay of uplink and downlink between the gNodeB (gNB) and the User Equipment (UE). Furthermore, the synchronization accuracy can be improved if the delay difference between uplink and downlink is known.

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Metadaten
Author:Anas Bin MuslimORCiD, Ralf TönjesORCiD, Thomas Bauschert
Title (English):Synchronizing TSN Devices via 802.1AS over 5G Networks
URL:https://www.mdpi.com/2079-9292/13/4/768
DOI:https://doi.org/10.3390/electronics13040768
ISSN:2079-9292
Parent Title (German):Electronics
Document Type:Article
Language:English
Year of Completion:2024
Release Date:2024/04/09
Tag:5G; 802.1AS; TSN; time synchronization
Volume:13
Issue:4
Page Number:13
Note:
This article belongs to the Special Issue Precise Timing and Security in Internet of Things)

Open Access
Faculties:Fakultät IuI
DDC classes:000 Allgemeines, Informatik, Informationswissenschaft / 004 Informatik
Review Status:Veröffentlichte Fassung/Verlagsversion
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International