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A MAC protocol for wireless ATM over CDMA

Several MAC protocols for wireless ATM have been described in the literature; TDMA and FDMA combinations making up the bulk of these. Very little has appeared on MAC protocols for ATM over CDMA channels. This paper introduces a protocol for carrying ATM cells over a wireless CDMA channel between a mobile and a base station. The paper considers CBR, VBR and ABR traffic. QoS is guaranteed in the CAC scheme, and implemented using a power control mechanism. The protocol makes use of a movable boundary mechanism to partition the bandwidth in proportion to traffic demand. The soft capacity nature of CDMA is exploited by allowing CBR and VBR traffic to 'steal' bandwidth from ABR traffic. Simulation results show that this leads to a greater throughput than would be achieved without this mechanism.