Adaptive multimedia synchronization and scalable multipoint routing with mobility support.
Item
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Title
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Adaptive multimedia synchronization and scalable multipoint routing with mobility support.
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Identifier
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AAI9820558
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identifier
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9820558
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Creator
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Liu, Changdong.
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Contributor
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Advisers: Myung J. Lee | Tarek N. Saadawi
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Date
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1998
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Electronics and Electrical
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Abstract
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The paradigm shift in the Internet towards supporting multimedia, multipoint, mobility with QoS guarantee captures the emerging technologies in packet-switched internetworks. The work reported herein presents innovational research results in this new direction.;Application level QoS is always appreciated for multimedia/real-time applications over packet-switched internetworks. A efficient, yet simple to implement, adaptive multimedia synchronization algorithm has been developed. The suer defined QoS specifications can be directly mapped into the design parameters of the algorithm. The essence of the algorithm is partitioning the vicinity of the arrival epochs of packets into regions, counting arrivals at each region and adjust the PlayBack Clock (PBC) accordingly. The algorithm is adaptive to network changes, eliminates the need for a global clock, and is immune to the clock frequency drift.;Existing multipoint and mobile support approaches face the same problem--scalability, which constantly challenge the masterminds behind the Internet. Early work on multipoint support uses source-based tree technique, which is tolerable when group members are densely packed and bandwidth is plentiful but not proper for wide area networks. Relatively new approaches use shared-tree technique, in which a center-specific tree spanning all members of each group is used to deliver multicast traffic for that group. But how to efficiently select the center for a group is still an open issue.;The proposed work, Core-Manager based Multicast Routing (CMMR), takes a new approach to the issues of center-specific tree creation and management. The basic idea behind CMMR is that the Core-Manager keeps tracking cores of each multicast delivery tree in order to maintain a brief image of the tree. Consequently, new members will almost always be direct to a nearby core to join the group so that tree cost is well confined. However, not every new member has to actually consult the Core-Manager to join the tree due to a self-growing scheme, which further lowered the control overhead. Further improving on scalability is sought by using a hierarchical architecture, which requires the multicast addresses be administratively scoped in accordance with the hierarchy. Given such a hierarchical CMMR multicast autonomous region, different approaches to reconnecting a mobile multicast group member host to its group tree after each moving into a new subnetwork are proposed.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
