Abstract
The Time-Sensitive Networking (TSN) Task Group has standardised different mechanisms to provide Ethernet with hard real-time guarantees and reliability in layer 2 of the network architecture. Specifically, TSN proposes using space redundancy to increase the reliability of Ethernet networks, but using space redundancy to tolerate temporary faults is not a cost-effective solution. For this reason, we propose to use time redundancy to tolerate temporary faults in the links of TSN-based networks. Specifically, in previous works we proposed the Proactive Transmission of Replicated Frames (PTRF) mechanism to tolerate temporary faults in the links. Now, in this work we present a series of models of TSN and PTRF developed using PRISM, a probabilistic model checker that can be used to evaluate the reliability of systems. After that, we carry out a parametric sensitivity analysis of the reliability achievable by TSN and PTRF and we show that we can increase the reliability of TSN-based networks using PTRF to tolerate temporary faults in the links of TSN networks. This is the first work that presents a quantitative analysis of the reliability of TSN networks.
Highlights
The Time-Sensitive Networking (TSN) Task Group (TG) has been working on providing Ethernet with hard Real-Time (RT) guarantees and Fault-Tolerance (FT) mechanisms in layer 2 of the network architecture [1]
In [12] we present a proposal to integrate Proactive Transmission of Replicated Frames (PTRF) with the IEEE Std 802.1CB standard for Frame Replication and Elimination for Reliability (FRER) that supports space redundancy in TSN [6,7], while in [10] we present the third approach of the PTRF mechanism, we build a simulation model for each approach and we use exhaustive fault injection to compare them in terms of the number of fault scenarios that each can tolerate
Another important aspect to keep in mind during the description of the models is that we have developed our models in such a way that, in the future, we can evaluate the reliability achievable when using PTRF together with TSN’s fault-tolerance mechanisms: space redundancy (FRER) [6,7] and error containment [8]
Summary
The Time-Sensitive Networking (TSN) Task Group (TG) has been working on providing Ethernet with hard Real-Time (RT) guarantees and Fault-Tolerance (FT) mechanisms in layer 2 of the network architecture [1]. The TSN TG has not proposed any time redundancy mechanisms in layer 2 of the network architecture to tolerate temporary faults in the links. In previous works we proposed to use time redundancy to tolerate temporary faults in the links, as we think it is a more suitable solution, for systems with cost, size, weight, or energy restrictions. We have designed the Proactive Transmission of Replicated Frames (PTRF) mechanism to provide time redundancy to TSN-based networks.
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