DYNAMIC TIME-SLOT ASSIGNMENT SCHEMES FOR TDMA-BASED WIRELESS ATM

It is indispensable to establish a multi-access protocol and resource management technique that can assure transmission quality and efficien tly utilize the radio frequency spectrum for ATM-based wireless access systems. This paper proposes dynamic time-slot assignment schemes for the forward link from a user to a central station (CS): (1)the centra lized assignment and release scheme (CAR), and (2)the centralized-assi gnment and autonomous-release scheme (CAAR). In the proposed schemes, a central station dynamically assigns time-slots based on traffic info rmation obtained by monitoring the input traffic in each radio module (RM). In addition, forward protection is used to prevent false-release of assigned time-slots. Performance evaluations have been carried out by analysis as well as computer simulations. They show that the propo sed schemes achieve good performance in delay, link stability, and uti lization efficiency of radio resources with an optimized number of For ward protection steps.