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Rapport (Rapport De Recherche) Année : 2023

Delay Analysis of AVB traffic in Time-Sensitive Networks (TSN) with application to multi-packet Video Frames

Dorin Maxim
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  • PersonId : 864858
Ye-Qiong Song

Résumé

Future autonomous vehicles and ADAS (Advanced Driver Assistance Systems) need realtime audio and video transmission together with control data traffic (CDT). Although audio/video packet delay analysis has been largely investigated in AVB (Audio Video Bridging) context, it needs to be further extended with the presence of the CDT in the new TSN context and also extended to the response time analysis of large-size video frames which are often transmitted in multiple TSN Ethernet packets. In this paper we first present a local delay analysis of AVB packets under hierarchical scheduling of credit-based shaping and time-aware shaping on TSN switches. We analyze the effects of time aware shaping on AVB traffic, how it changes the relative order of transmission of packets leading to bursts and worst case scenarios for lower priority AVB streams. We also show that these bursts are upper-bounded by the Credit-Based Shaper, hence the worst-case transmission delay of a given stream is also upper-bounded. We present the analysis to compute the worst case delay for a packet, as well as the feasibility condition necessary for the analysis to be applied. Furthermore, we extend our analysis to the case of realistic video frames where each frame (image) needs to be split into several TSN packets and reassembled at the destination node. The analysis of such video frames has an extra level of complexity as the entire video frame needs to be transmitted within a given time limit, as opposed to just each packet having to respect a deadline. Additionally, a video frame may be transmitted over several cycles of the Time Aware Shaper and this is the first work, to the best of our knowledge, that considers such a model. Our methods (analysis and simulation) are applied to an automotive use case, which is defined within the Eurostars RETINA project, and where both control data traffic and AVB traffic must be guaranteed. For the case of multi-packet video streams we have analyzed a large amount of randomly generated stream sets in order to assess the pessimism of the analysis and the variation in feasibility with respect to the characteristics of the stream sets.
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Dates et versions

hal-04315533 , version 1 (30-11-2023)

Identifiants

  • HAL Id : hal-04315533 , version 1

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Dorin Maxim, Ye-Qiong Song. Delay Analysis of AVB traffic in Time-Sensitive Networks (TSN) with application to multi-packet Video Frames. Loria. 2023. ⟨hal-04315533⟩
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