Multichannel ALOHA data networks for personal communications services (PCS)

Two wireless data network access protocols, multichannel ALOHA with and without reservation, for personal communications services are studied. A Markov model is used to analyze the system throughput and average message delay. The combined effect of Rayleigh fading, log-normal shadowing, and spatial distribution of the mobile users on the system throughput is included. Numerical results show that the throughput of such a slotted multichannel ALOHA system with capture is much higher than that without capture, as expected. The results also indicate that multichannel ALOHA protocol with reservation has much higher throughput and less delay than the protocol without reservation, if the set-up time is negligible. The analysis can be easily used to analyze the reservation random access (RRA) schemes for voice transmission