Impart of access scheme selectability on traffic performance in wireless multimedia communications system

This article proposes a flexible wireless multimedia communications system where time-division multiple-access (TDMA) and direct sequence code-division multiple-access (DS-CDMA) schemes are flexibly selectable according to user's quality of services (QoSs) and channel conditions. We evaluate the traffic performance of the proposed system and discuss the impact of the access scheme selectability on the traffic performance. The key element of the proposed system is how to determine an appropriate access scheme for a user. Therefore, we theoretically derive a simple selection algorithm to maximize the system capacity. Our computer simulation results show that the proposed system with the derived access scheme selection algorithm can significantly improve the traffic performance as compared with conventional TDMA and CDMA systems.