ABSTRACT
In this chapter, we propose a cache replacement approach based on a value of sensed information (VoI) policy for fog applications. Our approach depends on three functional parameters in information-centric sensor networks (ICSNs). These three parameters are age of data based on periodic request, popularity of on-demand requests, and the duration for which the sensor node is required to operate in active mode to capture the sensed readings. These parameters are considered together to assign a value to the cached data to retain the most valuable information in the cache for longer time. The higher the value, the longer the duration for which the data will be retained in the cache. This replacement strategy provides significant availability for most valuable and difficult to sense data in the ICSNs. Extensive simulations are performed to compare our approach against other dominant cache replacement policies under varying circumstances such as data popularity, cache size, network load, and connectivity degree.
