内容流行分布动态性对基站端缓存性能的影响
发布时间：2019-04-25 19:30
【摘要】：为了满足移动数据的爆炸性增长,在无线边缘部署缓存已经成为下一代移动通信的研究热点之一。业务模型与实际相符的程度直接决定了无线缓存性能评估的准确性,然而目前几乎所有关于无线缓存的文献所采用的文件请求模型并未考虑内容流行分布的动态变化。最近已有文献考虑时变流行分布,但是均采用了被动缓存策略,而主动缓存策略对无线缓存十分重要。本文分别基于一个能够描述内容流行度动态变化的文件请求模型——散粒噪声模型、和现有文献中广泛采用的独立参考模型,分析了采用被动和基于预测的主动基站缓存策略时内容流行分布动态变化对命中率和无线网络吞吐量的影响。仿真结果表明,采用散粒噪声模型对评估无线缓存系统吞吐量的影响很大,特别是当网络中干扰较小时;另外,已有文献基于被动缓存策略得到的结论并不适于主动缓存策略。
[Abstract]:In order to meet the explosive growth of mobile data, the deployment of cache at the wireless edge has become one of the research hotspots of next generation mobile communication. The accuracy of wireless cache performance evaluation is directly determined by the degree of consistency between the traffic model and the actual situation. However, almost all the file request models adopted in the literature on wireless cache do not take into account the dynamic changes of the popular distribution of content at present. In recent literature, time-varying popular distribution is considered, but passive caching strategy is adopted, and active caching strategy is very important to wireless caching. This paper is based on a file request model which can describe the dynamic change of content popularity-the granular noise model, and the independent reference model widely used in the existing literature. This paper analyzes the impact of dynamic change of popular content distribution on hit ratio and throughput of wireless network when passive and prediction-based active base station caching strategy is adopted. The simulation results show that the granular noise model has a great impact on the throughput evaluation of wireless cache system, especially when the interference is small in the network, and the conclusions based on the passive caching strategy in the literature are not suitable for the active caching strategy.
【作者单位】： 北京航空航天大学电子信息工程学院;
【基金】：国家自然科学基金(61671036)
【分类号】：TN929.5
本文编号：2465396
[Abstract]:In order to meet the explosive growth of mobile data, the deployment of cache at the wireless edge has become one of the research hotspots of next generation mobile communication. The accuracy of wireless cache performance evaluation is directly determined by the degree of consistency between the traffic model and the actual situation. However, almost all the file request models adopted in the literature on wireless cache do not take into account the dynamic changes of the popular distribution of content at present. In recent literature, time-varying popular distribution is considered, but passive caching strategy is adopted, and active caching strategy is very important to wireless caching. This paper is based on a file request model which can describe the dynamic change of content popularity-the granular noise model, and the independent reference model widely used in the existing literature. This paper analyzes the impact of dynamic change of popular content distribution on hit ratio and throughput of wireless network when passive and prediction-based active base station caching strategy is adopted. The simulation results show that the granular noise model has a great impact on the throughput evaluation of wireless cache system, especially when the interference is small in the network, and the conclusions based on the passive caching strategy in the literature are not suitable for the active caching strategy.
【作者单位】： 北京航空航天大学电子信息工程学院;
【基金】：国家自然科学基金(61671036)
【分类号】：TN929.5
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