Trade-off Relationship Between Operability and Fairness in Networked Balloon Bursting Game Using Haptic Interface Devices

This paper investigates the trade-off relationship between the operability of haptic interface device and the fairness between players by carrying out subjective and objective QoE (Quality of Experience) assessments in a networked balloon bursting game. In the game, two players burst balloons in a 3D virtual space by using haptic interface devices, and they compete for the number of burst balloons. As a result, we confirm that there exists a trade-off relationship between the operability and fairness; that is, if we try to improve the fairness, the operability is degraded when the network delays are different from terminal to terminal; if we try to improve the operability, the fairness is damaged. We also find that the contribution of the fairness is larger than that of the operability to the comprehensive quality (i.e., the weighted sum of the operability and fairness). Assessment results further show that the output timing of terminals should be adjusted to the terminal which has the slowest output timing to maintain the fairness when the difference in network delay between the terminals is large. In this way, the comprehensive quality at each terminal can also be maintained as high as possible.