A Timing Control Framework in Delayed Network for Distributed Multimedia System

H. Hayakawa, K. Yamamoto, S. Tagashira, T. Kitasuka, T. Nakanishi, and A. Fukuda (Japan)


Distributed Multimedia Systems, Home Network, Trans mission Delay


Some home network platforms allow interoperation and contents sharing among home appliances. However, exist ing platforms lack one-to-many interaction protocol. As a result, appliances employ non-standard protocols or wiring with dedicated cables. In such an environment, users still have to care configuration of appliances, and cannot take advantage of network capability. From a view of content format, formats supported by existing platforms consist of strictly tied media. Therefore, existing platforms have difficulty to separate constituent media and play them on multiple equipments. One-to-many interactions with con tents that can be extracted to a subset of constituent me dia allow each of media to be played on multiple suitable equipments. Enabling dynamical configuration of repro duction equipments can deal user contexts and environment changes to improve usability. Coordinated timing control for synchronized play is necessary for playing single con tent on multiple equipments. Existing content formats re alize synchronized play by limiting the types of constituent media. To accomplish coordinated timing control through shared network, it is necessary to consider the transmis sion delay caused by traffic convergence or frame colli sions. This paper proposes a new framework for media independent coordinated timing control. Proposal frame work adopts delay estimation methods: latest applying method and delay forecast method. Evaluation based on a prototype system shows that delay forecast method can improve the accuracy and stability of control.

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