Different quality-of-service (QoS) required types of multimedia services and need a guaranteed service rate in wireless multimedia networks. When the number of user arrivals increases, bandwidth degradations may occur due to limited bandwidth nature of cellular wireless networks. The bandwidth that should be assigned to user cannot be met for QoS provisioning in congested network. In this paper, a priority-based call admission control scheme with bandwidth adaptation is proposed to provide the required QoS to service users and to utilize the bandwidth effectively. An analytical model is developed to evaluate the numerical results. Proposed scheme differentiates the services according to their call-level QoS priorities as non-prioritized and prioritized calls and provides the satisfactory QoS under the upper bound limitations. Further, bandwidth adaptation policy maintains the higher performance results in terms of blocking and dropping probabilities, resource utilization and throughput of non-prioritized calls.
Key words: Priority-based call admission control (CAC), bandwidth adaptation, quality-of-service (QoS), bandwidth allocation.
QoS, Quality-of-service; CAC, call admission control; DP-CAC,dynamic priority call admission control; CP-CAC, complete partitioning call admission control; QP-CAC, queuing priority call admission control.
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