Priority-based haptic event filtering for transmission and error control in networked virtual environments

Lee, Seok-Hee; Kim, Jong-Won

doi:10.1007/s00530-009-0170-4

Cited by 13 publications

(9 citation statements)

References 34 publications

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“…SHVEs are often realized using a client-server communication architecture (Hikichi et al, 2001;Lee & Kim, 2009a;Schuwerk, Chaudhari, & Steinbach, 2012), although it is known that such a centralized architecture generally suffers from scalability issues (Marsh, Figure 1. Consistency client-server architecture with centralized physics engine at the server and local force rendering at the clients (recreated from .…”

Section: Motivationmentioning

confidence: 99%

“…The object-state prediction is also used to absorb lost state update packets (Hikichi et al, 2001). In Lee and Kim (2009a), based on the quality of state predictions, updates are categorized into three different priorities. Depending on the current network load, updates with the lowest priority are skipped, while updates with the highest priority are always sent reliably.…”

Section: Traffic Control In Distributed Simulationsmentioning

confidence: 99%

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Perception-Based Traffic Control for Shared Haptic Virtual Environments

Schuwerk

Paggetti

Chaudhari

et al. 2014

Presence: Teleoperators and Virtual Environments

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Shared Haptic Virtual Environments (SHVEs) are often realized using a client-server communication architecture. In this case, a centralized physics engine, running on the server, is used to simulate the object-states in the virtual environment (VE). At the clients, a copy of the VE is maintained and used to render the interaction forces locally, which are then displayed to the human through a haptic device. While this architecture ensures stability in the coupling between the haptic device and the virtual environment, it necessitates a high number of object-state update packets transmitted from the server to the clients to achieve satisfactory force feedback quality. In this paper, we propose a perception-based traffic control scheme to reduce the number of object-state update packets, by allowing a variable but not perceivable object-state error at the client. To find a balance between packet rate reduction and force rendering fidelity, our approach uses different error thresholds for the visual and haptic modality, where the haptic thresholds are determined by psychophysical experiments in this paper. Force feedback quality is evaluated with subjective tests for a variety of different traffic control parameter settings. The results show that the proposed scheme reduces the packet rate by up to 97%, compared to communication approaches that work without data reduction. At the same time, the proposed scheme does not degrade the haptic feedback quality significantly. Finally, it outperforms well-known dead reckoning, commonly used in visual-only distributed applications.

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Section: Motivationmentioning

confidence: 99%

Section: Traffic Control In Distributed Simulationsmentioning

confidence: 99%

Perception-Based Traffic Control for Shared Haptic Virtual Environments

Schuwerk

Paggetti

Chaudhari

et al. 2014

Presence: Teleoperators and Virtual Environments

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“…There are eleven users (A-K) and eight objects (1)(2)(3)(4)(5)(6)(7)(8). Every user maintains a complete copy of the virtual environment.…”

Section: A High-level Overviewmentioning

confidence: 99%

“…in [6], [7], [8]). Herein, a local database is maintained at each client, storing the current state of the complete virtual environment.…”

Section: Communication Architectures For Shvesmentioning

confidence: 99%

“…The update rate from the centralized consistency server to the clients is adjusted according to the current network conditions in [6] by simply dropping packets to avoid congestion in the network. In [8], haptic media units, meaning device position and object states, are assigned with priorities based on their predictability and loss effect. These priority values, together with the monitored network state, are then used to drop update packets eventually.…”

Section: Traffic Controlmentioning

confidence: 99%

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An area-of-interest based communication architecture for Shared Haptic Virtual Environments

Schuwerk

Chaudhari

Steinbach

2013

2013 IEEE International Symposium on Haptic Audio Visual Environments and Games (HAVE)

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Abstract-Communication architectures conceived for SharedHaptic Virtual Environments (SHVEs) are based on either the client-server or the peer-to-peer paradigms. High-rate rendering and communication between collaborating users quickly leads to performance bottlenecks, if the virtual environment's size and complexity or the number of collaborating users increases. We propose a decentralized communication architecture for SHVEs, which exploits areas of interest (AoI) of a user to dynamically form smaller communication groups. High-rate information exchange following the client-server paradigm is used within these groups to support satisfactory haptic collaboration and consistency. A single group member is selected to simulate the object states and to relay this state to the other group members. Peerto-peer inter-group communication is also used, based on spatial proximity, to further reduce the overall communication load. We implemented a prototype based on our proposed architecture and present some first evaluation results. They serve as a proof-ofconcept and show the effectiveness of dynamic group maintenance in conjunction with additional traffic control schemes.

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Introduction

Lee¹,

Payandeh²

2015

Haptic Teleoperation Systems

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Priority-based haptic event filtering for transmission and error control in networked virtual environments

Cited by 13 publications

References 34 publications

Perception-Based Traffic Control for Shared Haptic Virtual Environments

Perception-Based Traffic Control for Shared Haptic Virtual Environments

An area-of-interest based communication architecture for Shared Haptic Virtual Environments

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