Pulse+: DetNet Routing Under Delay-Diff Constraint

Shizhen Zhao

doi:10.1109/TON.2025.3586040

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Pulse+: DetNet Routing Under Delay-Diff Constraint

2025-07-11

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Shizhen Zhao

Ximeng Liu

Xinbing Wang

DOI：10.1109/TON.2025.3586040

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Abstract

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Deterministic Networking (DetNet) is a rising technology that offers deterministic delay & jitter and extremely low packet loss in large IP networks. To achieve determinism under failure scenarios, DetNet requires finding at least two paths with close end-to-end delay, i.e., a delay-diff constraint, for mission-critical flows. However, how to find two routing paths subject to the delay-diff constraint remains open. We study the DetNet routing problem in two scenarios. First, given a primary path, we propose Pulse+, which finds a secondary path whose end-to-end delay is within a range determined by the end-to-end delay of the primary path and the delay-diff requirement. Second, we propose CoSE-Pulse+, which integrates Pulse+ with a divide-and-conquer approach to find a pair of paths that meet DetNet’s delay-diff constraint. Both Pulse+ and CoSE-Pulse+ guarantee solution optimality. Notably, although Pulse+ and CoSE-Pulse+ do not have a polynomial worst-case time complexity, their empirical solver running time is better than that of other algorithms. We evaluate Pulse+ and CoSE-Pulse+ against the K-Shortest-Path and Lagrangian-dual based algorithms using synthetic test cases generated over networks with up to 10000 nodes. Both Pulse+ and CoSE-Pulse+ can solve more test cases than other algorithms under a predefined time limit. Compared to the second best algorithm, Pulse+ achieves an average-time speedup of $5\times $ and CoSE-Pulse+ achieves an average-time speedup of $22\times $ . Our code and test cases are available at https://gitee.com/zsz2019_shizhenzhao/drcr

Keywords:

DetNet

routing

delay-diff

bounded jitter