New channel reservation techniques for media access control protocol in high bit-rate wireless communication systems

This paper presents a new class of channel reservation techniques for medium access control protocols suitable for high bitrate wireless communication systems. Seven distinct channel reservation schemes are proposed, namely CFP (cascade fixed probability), CAP (cascade adaptive probability), COP (cascade optimal probability), COP+SPL (split), CFP+SPL, UNI (uniform) and UNI+LA (limited access) and their performances are analytically evaluated and compared with existing techniques. In the high-speed environment, transmission time is comparatively shorter than the propagation delay so that the user request outcome cannot be acquired within the same reservation period. Consequently, users will request only once in each reservation period. Under such an environment, it is shown that conventional reservation techniques become less effective and the proposed schemes are superior as they take both the number of active users and available slots simultaneously into consideration while accessing the request slots.