Mixed Timescale Online PHY Caching and Content Delivery for Content-Centric Wireless Networks
Mixed Timescale Online PHY Caching and Content Delivery for Content-Centric Wireless Networks
复制标题
DOI：
10.1109/glocom.2017.8254710
复制
发表时间：
2017-12
期刊：
影响因子：
--
通讯作者：
An Liu;V. Lau;Wenchao Ding;E. Yeh
中科院分区：
文献类型：
--
作者：
An Liu;V. Lau;Wenchao Ding;E. Yeh
在以内容为中心的无线网络中，物理层(PHY)缓存被提出以利用基站(BS)缓存所产生的动态边信息来支持协调多点(CoMP)并获得巨大的容量收益。PHY缓存的性能在很大程度上取决于缓存内容放置算法。在现有的算法中，缓存内容放置以离线的方式适应长期的热度分布。提出了一种基于虚拟网络中虚拟兴趣包(VIP)概念的在线物理层缓存框架。VIP捕捉微观的空间和临时的热度变化，因此基于VIP的在线PHY缓存可以使缓存的内容适应微观的热度变化，从而充分发挥PHY缓存的优势。将在线缓存和内容分发的联合优化问题描述为一个混合时间尺度漂移最小化问题，并提出了一种低复杂度的算法来寻找最优解。仿真结果表明，与已有方案相比，该方案获得了较大的增益。
In content-centric wireless networks, physical layer (PHY) caching has been proposed to exploit the dynamic side information induced by base station (BS) cache to support Coordinated Multi-Point (CoMP) and achieve huge capacity gain. The performance of PHY caching depends heavily on the cache content placement algorithm. In existing algorithms, the cache content placement is adaptive to the long-term popularity distribution in an offline manner. We propose an online PHY caching framework based on the concept of virtual interest packet (VIP) in a virtual network. The VIP captures microscopic spatial and temporary popularity variations, and thus the VIP-based online PHY caching can adapt the cached content to the microscopic popularity variations to fully exploit the benefits of PHY caching. The joint optimization of online caching and content delivery is formulated as a mixed timescale drift minimization problem and a low complexity algorithm is proposed to find the optimal solution. Simulations show that the proposed solution achieves large gain over existing solutions.