Evaluating ALPHAN with Multi-user Collaboration

In our previous work we introduced a novel application layer protocol, named ALPHAN, for haptic data communication. In this paper, we present a thorough evaluation of the protocol using a multi-user collaborative haptic application. The benchmark application consists of a simple game where three users attempt to lift a 3D triangular shape and place it in a triangular hole. The performance metrics and the test bed of the protocol evaluation are also discussed. It is found that a delay of 150 ms or higher caused the participating users not even to feel the existence of each other. Also a comparison between the two users and three users scenarios is considered. Finally, we comment on our findings and provide directions for prospective research.