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Estimation of Degradation Period Ratio for Adaptive Framework in Mobile Cellular Networks  

Jung, Sung-Hwan (Department of Industrial Engineering, Seoul National University)
Lee, Sae-Jin (Department of Industrial Engineering, Seoul National University)
Hong, Jung-Wan (Division of Industrial and System Engineering, Hansung University)
Lee, Chang-Hoon (Department of Industrial Engineering, Seoul National University)
Publication Information
Journal of Korean Institute of Industrial Engineers / v.29, no.4, 2003 , pp. 312-320 More about this Journal
Abstract
Recently there is a growing interest in mobile cellular network providing multimedia service. However, the link bandwidth of mobile cellular network is not sufficient enough to provide satisfactory services to users. To overcome this problem, an adaptive framework has been proposed. In this study, we propose a new method of estimating DPR(Degradation Period Ratio) in an adaptive multimedia network where the bandwidth of ongoing call can be dynamically adjusted during its lifetime. DPR is a QoS(Quality of Service) parameter which represents the ratio of allocated bandwidth below a pre-defined target to the whole service time of a call. We improve estimation method of DPR using DTMC(Discrete Time Markov Chain) model by calculate mean degradation period, degradation probability more precisely than in existing studies. Under Threshold CAC(Call Admission Control) algorithm, we present analytically how to guarantee QoS to users and illustrate the method by numerical examples. The proposed method is expected to be used as one of CAC schemes in guaranteeing predefined QoS level of DPR.
Keywords
adaptive multimedia network; degradation period ratio; call admission control; quality of service; discrete time markov chain;
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