| Project/Area Number |
12555109
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
情報通信工学
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
TASAKA Shuji Nagoya Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (80110261)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Yoshihiro Nagoya Institute of Technology, Faculty of Engineering, Assistant Professor, 工学部, 講師 (50335098)
ISHIBASHI Yutaka Nagoya Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (40252308)
KATO Masami SANYO Electric Co., Ltd, Digital Systems Development Center, Principal Researcher, デジタルシステム研究所, 主管研究員
NUNOME Toshiro Nagoya Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (10345944)
SUZUKI Takahiro Nihon Fukushi University, Faculty of Social and Information Sciences, Associate Professor, 情報社会科学部, 助教授 (70262954)
塩川 茂樹 名古屋工業大学, 工学部, 助手 (30303689)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥12,900,000 (Direct Cost: ¥12,900,000)
Fiscal Year 2002: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2001: ¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2000: ¥7,400,000 (Direct Cost: ¥7,400,000)
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| Keywords | multimedia mobile communications / media synchronization / wireless LAN / PHS / Bluetooth / handover / multicast / inter-destination synchronization / WaveLAN / PHSベストエフォートサービス / 垂直ハンドオーバ |
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| Research Abstract |
The research results can be classified into the following four categories.
1. We have studied the media synchronization quality for stored audio-video transmission in a wireless LAN environment with handover. By experiment, we have demonstrated that a retransmission-based error recovery scheme RVTR with dynamic resolution control of video can improve the voice quality.
2. We have proposed a traffic control scheme for continuous media over a PHS 64kbps best-effort channel, whose transmission capacity changes between two values according to network conditions. We developed two types of experimental systems : one changes the capacity only within a base station, and the other switches it by handover between two public base stations. The experiment showed the effectiveness of the scheme.
3. Experimental assessment of the media synchronization quality in a Bluetooth LAN access system has been made when a server transfers stored audio and video streams to a terminal with point-to-point communication. We first examined the effects of the interference from DSSS wireless LAN systems and Bluetooth packet types on the quality. We then studied the effect of segmentation mismatch caused by the difference between the RFCOMM Maximum Frame Size and the baseband packet payload size. We also proposed a scheme that adaptively selects the best packet type according to the network condition and showed its effectiveness by experiment.
4. An experimental study on inter-destination synchronization control has been done in an integrated wired and wireless network that consists of a router-based IP network and a wireless LAN with two base stations. A server in the wired network multicasts a pair of audio and video streams to a wired terminal and a wireless terminal which performs handover from one base station to the other. We measured the synchronization quality of inter-destination as well as intra-stream and inter-stream.
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