Study on Multimedia communication systems under heterogeneous network environment

异构网络环境下多媒体通信系统研究

• 批准号: 07650411
• 负责人: SEZAKI Kaoru
• 金额: $ 1.47万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650411/
• 关键词: Multimedia Network; MPEG; Hierarchical Coding; Selective packet discard; Protocol; Intermedia Priority; Subband Coding; Flow control

To avoid congestion in heterongeneous network environment during multimedia communication, it is necessary to discard packets of low priority. From this point of view, the treatment of intermedia priority is treated in this study. Further, the objective evaluation of such a priority structure is also discussed. Our primary result of this study are as follows.For the image media, we developed a novel coding scheme where both the hierarchical strucutre and reversibility are sustained. The coding effiecney of the proposed coding scheme is studied and it is clarified that the proposed shemce has a large advantage. Also, for lossy coding, we found a new conding scheme which has better coding efficiency. In finding them, we utilized the strucutre of sub-band coding.For network control sheme, we developed a new congestion deteciton algorithm where such congestion are detected in very short term, which is mixed with a novel flow control scheme. Computer simulation of this algorithm is also performed and the performance is verified. Further, we imbed this idea into the ABR service class of ATM.As typical application, we also developed a system where Q factor of MPEG streams are dynamically contorlled using this algorithm. This system was also implemented on the real B-ISDN systems.

在异构网络环境下进行多媒体通信时，为了避免拥塞，需要丢弃低优先级的数据包。从这一角度出发，本文对媒介优先权的处理进行了探讨。此外，这种优先级结构的客观评价也进行了讨论。本研究的主要结果如下：对于图像媒体，我们开发了一种新的编码方案，其中保持了分层结构和可逆性。研究了所提出的编码方案的编码效率，并阐明了所提出的方案具有很大的优势。对于有损编码，我们提出了一种新的编码方案，具有更好的编码效率。在网络控制方案中，提出了一种新的拥塞检测算法，在很短的时间内检测到拥塞，并与一种新的流量控制方案相结合。对该算法进行了计算机仿真，验证了算法的性能.作为典型应用，我们还开发了一个MPEG流的Q因子动态控制系统。该系统已在真实的B-ISDN系统上实现。

项目成果

J.C.Y.Hsiao: "Fair Bandwidth Sharing Between ER and EFCI Switches" 電子情報通信学会通信ソサイエティ大会. B-734 (1996)

J.C.Y.Hsiao：“ER 和 EFCI 交换机之间的公平带宽共享”IEICE 通信协会会议 B-734 (1996)。

小松邦紀: "可逆的サブバンド符号化の段階的画像再生における圧縮効率の向上" PCSJ96画像符号化シンポジウム. 51-52 (1996)

Kuninori Komatsu：“使用可逆子带编码提高逐步图像再现的压缩效率”PCSJ96 图像编码研讨会 51-52 (1996)。

S.Y.Kim: "A Partitioning Routing Scheme for ATM Switches" 電子情報通信学会総合大会. (1996)

S.Y.Kim：“ATM 交换机的分区路由方案”IEICE 大会（1996 年）。

R.Nishino: "A Synchronization Mechanism Among Various Media Including Teleoperaion in Multimedia Communications:" Proc.IEEE IECON'95. Etis-02/3. (1995)

R.Nishino：“包括多媒体通信中的远程操作在内的各种媒体之间的同步机制：”Proc.IEEE IECON95。

N.Tosa: "Network Neuro-Baby with Robotic Hand" HCI'95. (1995)

N.Tosa：“带有机械手的网络神经婴儿”HCI95。