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This paper investigates the impact of network impairments (delay, stalling) and task characteristics on Perceptual Interaction Fluency (PIF) in Remote Collaborative Augmented Reality (RCAR). They classify RCAR tasks based on task-specific Just Noticeable Difference (JND) in temporal responsiveness, conduct subjective experiments to evaluate PIF under various network conditions, and propose a Task-Aware Perceptual Interaction Fluency Model (TPIFM). The TPIFM accurately assesses PIF under network impairments, offering guidance for adaptive RCAR design and user experience optimization.
Task demands in remote AR collaboration dictate how much network delay users can tolerate before perceived fluency breaks down, paving the way for adaptive systems.
Remote Collaborative Augmented Reality (RCAR) enables geographically distributed users to collaborate by integrating virtual and physical environments. However, because RCAR relies on real-time transmission, it is susceptible to delay and stalling impairments under constrained network conditions. Perceptual interaction fluency (PIF), defined as the perceived pace and responsiveness of collaboration, is influenced not only by physical network impairments but also by intrinsic task characteristics. These characteristics can be interpreted as the task-specific just-noticeable difference (JND), i.e., the maximal tolerable temporal responsiveness before PIF degrades. When the average response time (ART), measured as the mean time per operation from receiving collaborator feedback to initiating the next action, falls within the JND, PIF is generally sustained, whereas values exceeding it indicate disruption. Tasks differ in their JNDs, reflecting distinct temporal responsiveness demands and sensitivities to impairments. From the perspective of the Free Energy Principle (FEP), tasks with lower JNDs impose stricter temporal prediction demands, making PIF more vulnerable to impairments, whereas higher JNDs allow greater tolerance. On this basis, we classify RCAR tasks by JND and evaluate their PIF through controlled subjective experiments under delay, stalling, and hybrid conditions. Building on these findings, we propose the Task-Aware Perceptual Interaction Fluency Model (TPIFM). Experimental results show that TPIFM accurately assesses PIF under network impairments, providing guidance for adaptive RCAR design and user experience optimization under network constraints.
