Spatially-Dispersed Caching in Information-Centric Networking
Noriaki Kamiyama, Masayuki Murata · 2018
Information-centric networking (ICN), a new network architecture for efficiently delivering content, has been widely investigated recently. In ICN, cache memory is implemented at each router, and content items are routed in the network by using the content name as the locator determining the destination. The caching strategy that determines the content to be cached at each router strongly affects the cache hit ratio and flow hop length, and it is important to efficiently utilize limited cache resources by avoiding duplicated caching of the same content among routers located closely. However, no caching strategy aiming at dispersing content over networks has been investigated. In this paper, we propose spatially dispersed caching (SDC), which is a caching strategy dispersing content by assigning a binary ID to each router and limiting the cache targets at each router to content with names whose hash value coincides with the router ID. Through computer simulations using backbone networks of actual ISPs in the USA, we show that SDC reduced the average hop length by about 5% to 20% compared with the existing caching strategies.