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In this paper, the authors introduce a threshold-based preemption strategy for supporting emergency traffic in cellular networks. Compared with the current commercially used policies, their scheme not only can guarantee a certain amount of resources to public customers, but also can provide immediate access for emergency users and flexibility for providers to adapt to different requirements and operating scenarios. In addition, under the combined preemption and queueing framework, interesting analytical relationships among channel occupancy, gross service time and success probability for public traffic are revealed. Based on this, guidelines for further improving satisfaction of public customers can be provided.
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