Improving Worst-Case Delay Analysis for Traffic of Additional Stream Reservation Class in Ethernet-AVB Network

Zhao, Lin; He, Feng; Li, Ershuai; Xiong, Haoyi

doi:10.3390/s18113849

Cited by 15 publications

(4 citation statements)

References 30 publications

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“…Since the standard 802.1Q [1] now supports multiple number of AVB classes, we extend the previous analysis work of supporting two classes [28] and three classes [29] to arbitrary number of AVB classes. The extension proof of credit bounds for arbitrary number of AVB classes can be found in our previous work [34].…”

Section: Credit Based Shaper (Cbs)mentioning

confidence: 89%

Quantitative Performance Comparison of Various Traffic Shapers in Time-Sensitive Networking

Zhao,

Pop,

Steinhorst

2021

Preprint

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Owning to the sub-standards being developed by IEEE Time-Sensitive Networking (TSN) Task Group, the traditional IEEE 802.1 Ethernet is enhanced to support real-time dependable communications for future time-and safety-critical applications. Several sub-standards have been recently proposed that introduce various traffic shapers (e.g., Time-Aware Shaper (TAS), Asynchronous Traffic Shaper (ATS), Credit-Based Shaper (CBS), Strict Priority (SP)) for flow control mechanisms of queuing and scheduling, targeting different application requirements. These shapers can be used in isolation or in combination and there is limited work that analyzes, evaluates and compares their performance, which makes it challenging for end-users to choose the right combination for their applications. This paper aims at (i) quantitatively comparing various traffic shapers and their combinations, (ii) summarizing, classifying and extending the architectures of individual and combined traffic shapers and their Network calculus (NC)-based performance analysis methods and (iii) filling the gap in the timing analysis research on handling two novel hybrid architectures of combined traffic shapers, i.e., TAS+ATS+SP and TAS+ATS+CBS. A large number of experiments, using both synthetic and realistic test cases, are carried out for quantitative performance comparisons of various individual and combined traffic shapers, from the perspective of upper bounds of delay, backlog and jitter. To the best of our knowledge, we are the first to quantitatively compare the performance of the main traffic shapers in TSN. The paper aims at supporting the researchers and practitioners in the selection of suitable TSN sub-protocols for their use cases.

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Section: Credit Based Shaper (Cbs)mentioning

confidence: 89%

Quantitative Performance Comparison of Various Traffic Shapers in Time-Sensitive Networking

Zhao,

Pop,

Steinhorst

2021

Preprint

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“…We use Network Calculus (NC) -as it is a well-established delay analysis framework -to offer local guarantees which remain valid even when new flows are added to the network. Details of the delay analysis of CBS using NC can be found in [11,21,25,27]. A complete overview of NC results for TSN has been presented in [18].…”

Section: Related Workmentioning

confidence: 99%

On the Validity of Credit-Based Shaper Delay Guarantees in Decentralized Reservation Protocols

Maile¹,

Voitlein²,

Grigorjew

et al. 2023

The 31st International Conference on Real-Time Networks and Systems

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Resource reservation is a fundamental mechanism for ensuring quality of service in time-sensitive networks, which can be decentralized by using reservation protocols. In the Ethernet technology Time-Sensitive Networking, this has been proposed in conjunction with the Credit-Based Shaper. For the reservation, the standards assume a maximum worstcase latency bound at each hop. However, we will show through formal analysis and simulation that these worstcase latency bounds are not safe. To face this, we propose an extension to the current standards to allow the reservation of time-sensitive traffic with reliable latency guarantees. The effectiveness of our approach is demonstrated through simulations of both synthetic and industrial networks. Finally, by providing additional information about neighboring devices, we could further increase the maximum reservable traffic by up to 20% in our test cases.

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“…Hence it is very important to have a safe and guaranteed WCD analysis for AVB that takes into account the ST flows. Although latency analysis methods have been successfully applied to AVB traffic in AVB networks [14], [15], [16], they do not take account for the interference of ST traffic on the AVB traffic and only consider two or three AVB classes. Recently, Cao et al [17] have proposed an eligible interval based formal analysis on the calculation of worst-case performance bounds for multiple classes of AVB traffic.…”

Section: Introductionmentioning

confidence: 99%

Latency Analysis of Multiple Classes of AVB Traffic in TSN With Standard Credit Behavior Using Network Calculus

Zhao

Pop

Zheng

et al. 2021

IEEE Trans. Ind. Electron.

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Time-Sensitive Networking (TSN) is a set of amendments that extend Ethernet to support distributed safety-critical and real-time applications in the industrial automation, aerospace and automotive areas. TSN integrates multiple traffic types and supports interactions in several combinations. In this paper we consider the configuration supporting Scheduled Traffic (ST) traffic scheduled based on Gate-Control-Lists (GCLs), Audio-Video-Bridging (AVB) traffic according to IEEE 802.1BA that has bounded latencies, and Best-Effort (BE) traffic, for which no guarantees are provided. The paper extends the timing analysis method to multiple AVB classes and proofs the credit bounds for multiple classes of AVB traffic, respectively under frozen and non-frozen behaviors of credit during guard band (GB). They are prerequisites for non-overflow credits of Credit-Based Shaper (CBS) and preventing starvation of AVB traffic. Moreover, this paper proposes an improved timing analysis method reducing the pessimism for the worst-case end-to-end delays of AVB traffic by considering the limitations from the physical link rate and the output of CBS. Finally, we evaluate the improved analysis method on both synthetic and real-world test cases, showing the significant reduction of pessimism on latency bounds compared to related work, and presenting the correctness validation compared with simulation results. We also compare the AVB latency bounds in the case of frozen and non-frozen credit during GB. Additionally, we evaluate the scalability of our method with variation of the load of ST flows and of the bandwidth reservation for AVB traffic.

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Improving Worst-Case Delay Analysis for Traffic of Additional Stream Reservation Class in Ethernet-AVB Network

Cited by 15 publications

References 30 publications

Quantitative Performance Comparison of Various Traffic Shapers in Time-Sensitive Networking

Quantitative Performance Comparison of Various Traffic Shapers in Time-Sensitive Networking

On the Validity of Credit-Based Shaper Delay Guarantees in Decentralized Reservation Protocols

Latency Analysis of Multiple Classes of AVB Traffic in TSN With Standard Credit Behavior Using Network Calculus

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