WLC08-3: Prioritized Admission and Differentiated Services Media Access Control for Multi-Services CDMA Systems
To enable combined connection-level and application-level QoS support in future multi-class CDMA-based system characterized with highly non-stationary loading at both levels, this paper integrates two adaptive control mechanisms of prioritized admission and rate scheduling. The buffered adjusted multimode dynamic guard bandwidth (BAM-DGB) admission control enables connection-level prioritization via dynamic guard method with differentiated congestion controls that minimizes handoff droppings in non-stationary environment. The adaptive differentiated services medium access control (ADS-MAC) complements the admission control with the target-tracking weighted fair queuing (TT-WFQ) scheduler that adapts allocated transmission rates subject to constraints imposed by the admission control. It enables delay-bandwidth decoupling for maximum resource utilizations, and absolute delay target- tracking for balanced degradations during system congestions. Numerical results indicate that the proposed mechanisms are able to maintain consistent connection dropping probabilities and scheduling delay targets under non-stationary loading and congestion conditions.