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首页> 外文期刊>International journal of communication systems >Design and performance evaluation of a mechanism to share contents over broadcast channels
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Design and performance evaluation of a mechanism to share contents over broadcast channels

机译：通过广播频道共享内容的机制的设计和性能评估

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In this paper, we present a novel mechanism (Wireless Data Sharing, WDS) to share popular contents between a set of second-level (children) proxies connected to a parent proxy by means of a bandwidth-limited, wireless, broadcast channel. The idea is as follows: when one of the children proxies requests a content from the parent proxy, the parent publishes the transmission of this content over a specific TCP connection between itself and the requesting child, so as to enable all the other children to capture it. Finally, the parent starts transmitting the content and the children may listen to the broadcast channel and sniff the content from the TCP connection. This allows users served by these proxies to decrease the time to access contents, without any additional bandwidth consumption. Furthermore, such a mechanism is able to decrease the load of the parent proxy. This work provides a detailed description of the architecture and functions of the WDS system, with explicit reference to the prototype we implemented. This prototype enabled us to evaluate the performance of the data sharing mechanism from both user and network viewpoints. In this regard, we carried out a measurement campaign in an IEEE 802.11 environment to evaluate the performance of the mechanism quantitatively. The results show that the WDS system guarantees not only bandwidth saving, but also lower content access latency with respect to the legacy proxy hierarchy system. In addition, the signalling overhead associated with the publishing mechanism proves to be very low.
机译：在本文中，我们提出了一种新颖的机制（无线数据共享，WDS），用于通过带宽受限的无线广播通道在连接到父代理的一组第二级（子级）代理之间共享流行内容。想法如下：当一个子代代理从父代代理请求内容时，父代通过自身与发出请求的子代之间的特定TCP连接发布此内容的传输，从而使所有其他子代都能捕获它。最后，父母开始传输内容，孩子可以收听广播频道并从TCP连接中嗅探内容。这使这些代理服务的用户可以减少访问内容的时间，而不会增加带宽消耗。此外，这种机制能够减少父代理的负载。这项工作对WDS系统的体系结构和功能进行了详细描述，并明确引用了我们实现的原型。这个原型使我们能够从用户和网络的角度评估数据共享机制的性能。在这方面，我们在IEEE 802.11环境中进行了测量活动，以定量评估该机制的性能。结果表明，与传统代理层次结构系统相比，WDS系统不仅可以保证节省带宽，还可以降低内容访问延迟。另外，与发布机制相关联的信令开销被证明非常低。

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