Insensitive Call Admission Control for Wireless Multiservice Networks

Insensitive Call Admission Control for Wireless Multiservice Networks,10.1109/LCOMM.2011.072911.111513,IEEE Communications Letters,Jorge Martinez-Baus

Insensitive Call Admission Control for Wireless Multiservice Networks  
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WO important quality of service measures for wireless networks are the fraction of new and handover calls that are blocked due to the lack of enough free resources. As handover blocking is more annoying than new call blocking for subscribers, efficient call admission control (CAC) strategies can be used to reject new calls in order to reserve resources for future handovers, while minimizing the impact on the blocking rate of new calls. Conventional trunk reservation policies for CAC lead to continuous-time Markov chains (CTMC) whose state-space cardinality grows very quickly with the number of channels and services supported. Then, determining the stationary distribution and parameters derived from it, like new and handover probabilities, might become an unfeasible task [1]. We propose a probabilistic CAC policy for multiservice wireless networks that supports different service classes (SCs) and provides differentiated treatment to each arrival type (new or handover). The CTMC that models the system is reversible and its stationary distribution has a product-form, which greatly simplifies its computation. In addition, the stationary distribution is insensitive to the channel holding time (CHT) distribution. An interesting feature of the proposed policy is that the resource sharing among SCs, and between new and handover calls of the same SC, can be controlled independently. Our work has been motivated in part by the study presented in [2], although we obtain results different from the ones derived there. In the next section we prove the reversibility and insensitivity properties. For illustrative purposes, in Section III we present a numerical example that confirms the insensitivity property. Finally, in Section IV we present examples of both reversible and non-reversible CAC policies.
Journal: IEEE Communications Letters - IEEE Commun. Lett. , vol. 15, no. 9, pp. 989-991, 2011
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