Journal of Korean Institute of Industrial Engineers (대한산업공학회지)

Korean Institute of Industrial Engineers (대한산업공학회)
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Estimation of Degradation Period Ratio for Adaptive Framework in Mobile Cellular Networks

적응형 구조를 갖는 이동통신망에서 호 저하 시간 비율 추정

  • 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)
  • 정성환 (서울대학교 산업공학과) ;
  • 이세진 (서울대학교 산업공학과) ;
  • 홍정완 (한성대학교 산업 및 기계시스템공학부) ;
  • 이창훈 (서울대학교 산업공학과)
  • Published : 2003.12.31
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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

References

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