Feasibility of QoS Control Based on QoS Mapping in Audio-Video Transmission over IEEE 802.11 Wireless LANs

This paper proposes a method for testing feasibility of QoS control based on QoS mapping. We focus on the issue in wireless IP networks with IEEE 802.11 MAC. In wireless multimedia applications, it is important to investigate how we enhance user-level QoS of audio-video transmission. As one of the methods, we can control QoS at lower levels so that user-level QoS keeps high by means of QoS mapping. However, there is no guarantee that a given scheme of QoS control at lower-levels can give desirable user-level QoS. Therefore, we must examine the feasibility of the QoS control. In order to test it, we introduce concepts of the feasibility space and the decision boundary, which are obtained by the QoS mapping with multiple regression analysis. To show the effectiveness of our method, we utilize the simulation results in a previous work by the authors' research group. The simulation treats application-level QoS control and MAC-level one; we adopt EDCA of IEEE 802.11e as MAC-level control.