Contention and polling based multiple access control with minimum piggybacking for wireless ATM network

In this paper a new multiple access control protocol for next generation multimedia wireless ATM (WATM) networks is proposed to achieve high channel utilization while satisfying quality-of-service (QoS) requirements of diverse multimedia ATM traffic types. A new contention access scheme is proposed to be used by voice connections to send their reservation requests during talkspurts, aiming to increase the probability of successfully accessing the network, decrease the probability of collision, reduce the access delay time and at the same time minimize the number of used contention minislots and utilize them efficiently. A number of polling control minislots are dedicated to available bit rate (ABR) connections to send their buffer length which required to base station scheduler to efficiently allocate slots for ABR traffic. A minimum piggybacking overhead (one bit flag) is used by variable bit rate (VBR) connections to indicate the buffering delay status and a novel slot allocation algorithm has been proposed to increase the VBR allocation efficiency and preserve the required QoS of VBR traffic. Simulation results are presented to show that the proposed protocol can provide very high channel utilization of approximately 99% for the wireless ATM channel while respects the required QoS of multimedia ATM traffic types.