Cache-aware Named-data Forwarding in Internet of Things

Named Data Networking (NDN), a revolution of the IP architecture, provides an information-centric routing for designing the unified Internet of Things (IoT) network protocol. However, the data forwarding scheme exploited by the current NDN generates lots of communication overhead and invalid caching hits, which is not suitable for IoT. This is because there exist large amounts of weak network devices with constrained resources in IoT compared to the Internet. In this paper, we first build a caching time model to characterize the caching process for individual packet and estimate the packet's caching time on the next hop node. Based on this model, we propose a cache-aware named-data forwarding scheme for the typical weak devices in IoT - wireless sensor nodes. Extensive simulation experiments have been performed to evaluate our scheme in terms of forwarding number, average delay and valid hit ratio. The results show that our scheme can reduce the packet number during multicast forwarding of router nodes, meanwhile guarantee valid hit ratio of content caching.