| 基于补丁流传输机制的移动流媒体系统的缓存替换算法 |
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| 引用本文： | 雷正雄,廖建新,朱晓民.基于补丁流传输机制的移动流媒体系统的缓存替换算法[J].高技术通讯,2006,16(7):671-675. |
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| 作者姓名： | 雷正雄 廖建新 朱晓民 |
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| 作者单位： | 北京邮电大学网络与交换技术国家重点实验室,北京,100876 |
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| 基金项目： | 高比容电子铝箔的研究开发与应用项目 |
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| 摘 要： | 介绍了在WCDMA网络中基于代理的移动流媒体系统的网络结构和特殊特征,给出了评价其中代理服务器缓存替换算法性能的平均传输成本和平均播放启动延迟这两个指标,推导出了在移动补丁流(MPatching)传输机制下与这些指标相对应的收益的计算公式,提出了适用于移动流媒体系统的基于收益的缓存替换算法.仿真结果表明,这种算法与传统的替换算法相比,具有更小的网络传输成本、播放启动延迟和更大的字节命中率,可显著提高移动流媒体系统的性能.
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| 关 键 词： | 移动流媒体系统 代理服务器 补丁流传输机制 收益 缓存替换算法 仿真 |
| 收稿时间： | 2005-06-28 |
| 修稿时间： | 2005年6月28日 |
Cache replacement algorithm for patching stream transmission scheme based mobile streaming media system |
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| Lei Zhengxiong,Liao Jianxin,Zhu Xiaomin.Cache replacement algorithm for patching stream transmission scheme based mobile streaming media system[J].High Technology Letters,2006,16(7):671-675. |
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| Authors: | Lei Zhengxiong Liao Jianxin Zhu Xiaomin |
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| Affiliation: | State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876 |
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| Abstract: | The network structure and special characters of the proxy-based streaming media system in WCDMA network are introduced,and two metrics,the mean transferring cost and the mean playback startup latency for evaluating the performance of the cache replacement algorithm of the proxy in the system are presented.Expressions for corresponding revenue of the metrics under the mobile patching(MPatching) stream transmission scheme are developed.A revenue-based cache replacement algorithm that applies to the mobile streaming media system is put forward.The simulation results demonstrate that the algorithm achieves less transferring cost and startup latency and higher Byte-Hit rate than the conventional replacement algorithm. |
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| Keywords: | mobile streaming media system proxy patching stream transmission scheme revenue cache replacement algorithm simulation |
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