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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2005 E88-A(7):1809-1815; doi:10.1093/ietfec/e88-a.7.1809
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Copyright © 2005 The Institute of Electronics, Information and Communication Engineers

Special Section on Multi-dimensional Mobile Information Networks -- Papers -- Network Management/Operation

Optimal Call Admission Control for Voice Traffic in Cellular Mobile Communication Networks

Minoru OHMIKAWA1, Hideaki TAKAGI2 and Sang-Yong KIM3

1 The author is with the Doctoral Program in Policy and Planning Sciences, University of Tsukuba, Tsukuba-shi, 305-8573 Japan., 2 The author was with the Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba-shi, 305-8573 Japan. E-mail: takagi{at}sk.tsukuba.ac.jp, 3 The author is with the Doctoral Program in Systems and Information Engineering, University of Tsukuba, Tsukuba-shi, 305-8573 Japan.

We propose a new call admission control (CAC) scheme for voice calls in cellular mobile communication networks. It is assumed that the rejection of a hand-off call is less desirable than that of a new call, for a hand-off call loss would cause a severe mental pain to a user. We consider the pains of rejecting new and hand-off calls as different costs. The key idea of our CAC is to restrict the admission of new calls in order to minimize the total expected costs per unit time over the long term. An optimal policy is derived from a semi-Markov decision process in which the intervals between successive decision epochs are exponentially distributed. Based on this optimal policy, we calculate the steady state probability for the number of established voice connections in a cell. We then evaluate the probability of blocking new calls and the probability of forced termination of hand-off calls. In the numerical experiments, it is found that the forced termination probability of hand-off calls is reduced significantly by our CAC scheme at the slight expense of the blocking probability of new calls and the channel utilization. Comparison with the static guard channel scheme is made.

Key Words: mobile communication networks, call admission control, semi-Markov decision process, blocking probability, forced termination, channel utilization

Manuscript received October 1, 2004. Manuscript revised January 21, 2005. Final manuscript received March 3, 2005.


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