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http://dx.doi.org/10.5207/JIEIE.2004.18.4.171

A Study on the Call Admission Control with Overflow and Preemption at Adaptive Moving Boundary in Cellular Mobile Communications  

노희정 (김포대학 전자정보계열)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.18, no.4, 2004 , pp. 171-180 More about this Journal
Abstract
CDP(handoff Call Dropping Probability) and CBP(new Call Blocking Probability) have been used as two important call level QoS parameters in cellular mobile communications. But, many methods to reduce CDP without considering CBP have been studied, and hand-off call priority scheme has been introduced. But the use of hand-off call priority scheme increases CBP and decreases channel utilization rate depending on the number of reserved channel for priority. In this paper, we propose a CAC(Call Admission Control) algorithm with overflow and preemption to solve the problem caused by considering CDP and CBP in calculation of the number of channel reserved. The problem is the increase of CDP as the traffic load increases. In our CAC algorithm, hand-off call is permitted to use(overflow) unreserved and unused channel if there is no reserved and unused channel, and new call is permitted to use(preemption) the channel overflowed by hand-off call if there is no unreserved and unused channel. This mechanism of calculation of the number of reserved channel and CAC algorithm is expected to increase channel utilization rate, and can be applied to media-based QoS provision in cellular mobile communications.
Keywords
CDP(hand-off Call Dropping Probability); CBP(new Call Blocking Probability); CAC(Call Admission Control);
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