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An End to End Adaptable Architecture for Streaming Media over IP Networks

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Abstract

Wireless networks differ in bandwidth, size and access costs each requiring a set of protocol functions to enable devices to communicate efficiently. Portable multimedia devices such as PDA's and laptops will also vary greatly however all these devices will require optimal multimedia delivery. A traditional method is for sources to limit their transmission rates to accommodate lower bandwidth links, even though high-bandwidth connectivity is available to many participants. This method similar to others does not provide optimum throughput to heterogeneous clients due to its quest for a common denominator bandwidth. In addition, due to the divergence of users and applications, traditional protocol stacks are frequently enriched with additional functionality such as transport protocol functionality, synchronization and presentation coding which can lead to a performance bottleneck due to the insufficient processing power and memory of portable devices.

Micro-protocols attempt to eradicate this bottleneck by optimising the protocol stack to the functionality that is actually required by the application. A side effect of this is that it allows a device such as a PDA to offer protocol functions, which would not normally be available due to its memory constraints achievable by downloading necessary micro-protocols for new environments and discarding previous micro-protocols. Multicast media groups overcome the heterogeneous client problem where clients subscribe to different quality of services in accordance with resource availability and move between groups according to bandwidth availability.

Chameleon is 100% Java middleware for multimedia streaming to heterogeneous mobile clients, which allows the dynamic configuration of protocols with respect to application requirements and available network resources. We evaluate the dynamic reconfigurability of the middleware in order to demonstrate runtime adaptation. We especially concentrate on the primary quality transformation technique (PQT) of the middleware which enables clients to subscribe to media groups in accordance with available resources and network capacity.

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Authors and Affiliations

  1. Internet Technologies Research Group, Northern Ireland Knowledge Engineering Laboratory, University of Ulster, Magee Campus, Northern Ireland, UK

    Kevin Curran & Gerard Parr

Authors
  1. Kevin Curran
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  2. Gerard Parr
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Curran, K., Parr, G. An End to End Adaptable Architecture for Streaming Media over IP Networks. Multimedia Tools and Applications 20, 225–236 (2003). https://doi.org/10.1023/A:1024020221086

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  • DOI: https://doi.org/10.1023/A:1024020221086

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