Design and Evaluation of the Optimal Cache Allocation for Content-Centric Networking
Design and Evaluation of the Optimal Cache Allocation for Content-Centric Networking
复制标题
以内容为中心的网络的最佳缓存分配的设计和评估
DOI:
10.1109/tc.2015.2409848
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发表时间:
2016
影响因子:
3.7
通讯作者:
Xie, Gaogang
中科院分区:
文献类型:
--
作者:
Li, Zhenyu;Tyson, Gareth;Uhlig, Steve;Xie, Gaogang
Content-centric networking (CCN) is a promising framework to rebuild the Internet's forwarding substrate around the concept of content. CCN advocates ubiquitous in-network caching to enhance content delivery, and thus each router has storage space to cache frequently requested content. In this work, we focus on the cache allocation problem, namely, how to distribute the cache capacity across routers under a constrained total storage budget for the network. We first formulate this problem as a content placement problem and obtain the optimal solution by a two-step method. We then propose a suboptimal heuristic method based on node centrality, which is more practical in dynamic networks with frequent content publishing. We investigate through simulations the factors that affect the optimal cache allocation, and perhaps more importantly we use a real-life Internet topology and video access logs from a large scale Internet video provider to evaluate the performance of various cache allocation methods. We observe that network topology and content popularity are two important factors that affect where exactly should cache capacity be placed. Further, the heuristic method comes with only a very limited performance penalty compared to the optimal allocation. Finally, using our findings, we provide recommendations for network operators on the best deployment of CCN caches capacity over routers.
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