Article
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Preserved in Portico This version is not peer-reviewed
Synchronizing TSN Devices via 802.1AS over 5G Networks
Version 1
: Received: 9 January 2024 / Approved: 9 January 2024 / Online: 10 January 2024 (08:55:07 CET)
A peer-reviewed article of this Preprint also exists.
Muslim, A.B.; Tönjes, R.; Bauschert, T. Synchronizing TSN Devices via 802.1AS over 5G Networks. Electronics 2024, 13, 768. Muslim, A.B.; Tönjes, R.; Bauschert, T. Synchronizing TSN Devices via 802.1AS over 5G Networks. Electronics 2024, 13, 768.
Abstract
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 synchronization accuracy can be achieved with the corrected asymmetric propagation delay of uplink and downlink between the gNodeB (gNB) and the User Equipment (UE). Futhermore, the synchronization accuracy can be improved if the delay difference between uplink and downlink is known.
Keywords
tsn; time synchronization; 5G; 802.1AS
Subject
Engineering, Telecommunications
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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