科研之友
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摘要
Quality of Service (QoS) provisioning for wireless multimedia applications has attracted increasing research attentions. Due to limited bandwidth of time-varying wireless links and various QoS requirements of bursty multimedia applications, an effective call admission control (CAC) policy that efficiently utilizes the bandwidth is desired. We have proposed a Differentiated Queueing Service (DQS) to support per-packet differentiated services for admitted traffic, which has been illustrated feasibility for mixed streams with various QoS requirements in multimedia applications. This paper furthers the research by exploring a DQS-based CAC policy to maximize the bandwidth utilization of wireless networks while provisioning call-level as well as packet-level QoSs for multimedia applications. To this end, we novelly use delay bound violation probability as admission control threshold and a basic DQS-based CAC policy, namely Delay Bound violation probability Guard (DBG) policy is proposed. Then we optimize the policy by formulating it as a Semi-Markov Decision Process (SMDP). The optimal DBG policy is found by solving the linear programming formulation problem. Numerical results show that, the DBG policy over SMDP achieves its goals of maximizing the bandwidth utilization while provisioning both call-level and packet-level differentiated QoSs for each class of multimedia calls in comparison with bandwidth guard CAC policies.
