| Project/Area Number |
09650436
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
System engineering
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| Research Institution | University of Tsukuba |
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Principal Investigator |
TAKAGI Hideaki Institute of Policy and Planning Sciences, Professor, 社会工学系, 教授 (30260467)
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| Co-Investigator(Kenkyū-buntansha) |
ONOZATO Yoshikuni School of Engineering, Gumma University, Professor, 工学部, 教授 (10143710)
TAKAHASHI Yutaka Graduate School of Information Science, Nara, Advanced In-stitute of Science and, 情報科学研究科, 教授 (00135526)
ZHANG Yongbing Institute of Policy and Planning Sciences, University of Tsukuba, Assistant Prof, 社会工学系, 講師 (80242353)
HASHIDA On Institute of Policy and Planning Sciences, University of Tsukuba, Professor, 社会工学系, 教授 (70228401)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Multimedia networks / Mobile Netoworks / Traffic analysis / Queueing systems. / 待ち行列 |
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| Research Abstract |
(1) Characterization and Modeling of Multimedia Traffic
We have observed the 1/f property in the sequence of MPEG 2 variable bite rate compressed frames of a real video by the spectral analysis. We have also developed a method to generate an artificial long memory process from the sequence of the numbers of customers in an M/G/* queueing system.
(2) Evaluation of Call Loss Probabilities in Cellular Mobile Networks
We have evaluated the loss probability of new calls and the forced termination probability of hand-off calls for cellular mobile networks with non-uniform traffic conditions by numerical calculation of Markov models and simulation. Those probabilities have been compared between the current frequency division multiple access (FDMA) and the future code division multiple access (CDMA) schemes.
(3) Analysis of Probability Models for Complex Communication Networks
(a) We have analyzed a queueing system in which the input consists of a special semi-Markov process representing MPEG frame sequences and a Poisson process representing the interfering traffic, and evaluated the frame transmission delays based on the parameter values of real video data.
(b) We have studied the throughput and delay performance of the IEEE 1394 serial interface, and compared with CSMA/CD of Ethernet by using a simulation software package QPNET.
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