Freshness Management of Cache Content in Information-Centric Networking

Information-Centric Networking is proffering the roadway for future internet architecture. It is a transposition from the host-centric model to a content-centric model that supports unique naming, name-based routing and in-network caching. However, managing the stale content in in-network caching is one of the research challenges. The problem becomes even more perceptible in the case of transient data where there is a stringent requirement for the freshness of information. In this paper, we posit a cache freshness mechanism for both transient and static data with minimum signaling overhead. For transient data that require live updates, data is fetched directly from the producer and no in-network caching is done. However, rest of the transient data are assigned a lifetime by the producer. Lifetime of the content in the cache is checked in case a Interest packet for the same is received by the node from the consumer which reduces the overhead. For static data the item is evicted only due to the cache eviction policy. To validate our results we simulated the work in ndnSIM, and checking the efficiency and effectiveness of the work.