A new multiple access protocol for multimedia wireless networks

We design and analyze the performance of a new multiple access protocol, designed to attend multimedia traffic in cellular networks and wireless PCS. It is based on slotted-ALOHA and on the permission probability concept, modified in order to allow a different treatment for each kind of traffic. A first variation of the protocol (CPMA: Constant Permission Probabilities Multiple Access) assigns for each kind of traffic a constant and different permission probability value. In a second variation (DPMA: Dynamic Permission Probabilities Multiple Access), we dynamically assign permission probabilities using an extension of the Pseudo-Bayesian Algorithm. These schemes guarantee maximum priority to voice traffic as well as good channel utilization. Simulation results for voice, low delay data, ATM traffic and high delay data are presented with respect to their QoS requirements. We observe that DPMA presents a better performance when compared to CPMA, due to its adaptability to traffic changes.