| Project/Area Number |
15500038
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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 |
Computer system/Network
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| Research Institution | Nara Institute of Science and Technology |
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Principal Investigator |
ITO Minoru Nara Institute of Science and Technology, Graduate School of Information Science, Professor, 情報科学研究科, 教授 (90127184)
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| Co-Investigator(Kenkyū-buntansha) |
YASUMOTO Keiichi Nara Institute of Science and Technology, Graduate School of Information Science, Associate Prof., 情報科学研究科, 助教授 (40273396)
SHIBATA Naoki Shiga University, Faculty of Economics, Associate Prof., 経済学部, 助教授 (40335477)
MURATA Yoshihiro Nara Institute of Science and Technology, Graduate School of Information Science, Research Assoc., 情報科学研究科, 助手 (40362834)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2004: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2003: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | portable wireless device / streaming playback / battery-aware control / transcoding |
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| Research Abstract |
In streaming playback of video, portable wireless devices consume a lot of electric power for video data decoding and wireless communication. Therefore there are demands to control the power consumption so that the battery life can be extended to a desirable playback duration and/or the specified percentage of the battery capacity is left for the other applications. In this research, we have proposed a battery-aware video streaming system to play back for specified duration considering a preference of quality of video specified by each user and the remaining battery amount for portable wireless devices. In the system, power consumption is reduced by using transcoding of video and periodic bulk transfer of video data. We have implemented the system and carried out several experiments using a PDA and a laptop PC. As a result, we have confirmed that our system can extend the battery life up to 2.8 times on the PDA and up to 1.6 times on the laptop PC, and can control the battery life with reasonably small error.
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