Time Sensitive Networking over 5G Networks
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Sähkötekniikan korkeakoulu |
Master's thesis
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Authors
Date
2022-10-17
Department
Major/Subject
Communications Engineering
Mcode
ELEC3029
Degree programme
CCIS - Master’s Programme in Computer, Communication and Information Sciences (TS2013)
Language
en
Pages
73
Series
Abstract
Time-Sensitive Networking (TSN IEEE 802.1Q), is an Ethernet technology that provides deterministic messaging on standard Ethernet. When centrally managed, the TSN technology offers the capability of guaranteed delivery of messages with reduced jitter. TSN uses time-scheduling in providing deterministic communications and works at Layer 2 (L2) of the Open System Interconnection. The advantage of TSN working at L2 is that TSN entities (switches and bridges) only need the information contained in Ethernet headers to make forwarding decisions. In addition, the information carried in Ethernet frame payloads does not have to be limited to IP only, making TSN applicable in industrial applications with different application payloads. The goal of the thesis was to come up with a state-of-the-art design of IEEE TSN modules. This goal involved designing a topology for testing TSN, prototyping the TSN modules, and testing the modules when completed. The thesis evaluates how the developed TSN module's performance compares to IEEE WG set standards. I carried out the experimentation based on the IEEE Working Group (WG) recommendations and publications which provided the necessary modifications to Precision Time Protocol version 2 (PTPv2) regarding packets that needed to be modified to develop generalized Precision Time Protocols (gPTP). Before entering and exiting the 5G System (5GS), the gPTP messages are changed. These encompass all the needed packet header modifications and necessary calculations to achieve the synchronization accuracies of 900 nanoseconds as stipulated by the IEEE 802.1AS standard. The project's findings were that the functionalities stipulated by the IEEE TSN WG were possible to implement and even achieve synchronization between the different TSN modules. The thesis did not accomplish the synchronization accuracy levels specified by the IEEE TSN. This low synchronization accuracy level was understandable, considering that the 5GS and equipment needed to improve performance were missing. The thesis evaluates the exactness with which gPTP packets arriving at the TSN modules could be detected, captured, modified, and sent to end stations successfully and provides an in-depth explanation for why the synchronization accuracy levels achieved were low.Description
Supervisor
Kantola, RaimoThesis advisor
Requena, JoseKeywords
time, synchronisation, rate ratio, time offset