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Collaborative Caching in Cellular based IoT Network Considering the Data Lifetime

Internet of Things (IoT) devices are usually limited by battery capacity. Thus, Saving energy consumption of IoT devices is meaningful. By caching IoT data at intermediate nodes to avoid frequent activation of IoT devices to reduce energy consumption. We propose a novel collaborative caching in cellular based IoT network considering the data lifetime to ensure the effectiveness of the cache. The relationship between data lifetime and user access rate determines whether data is cached. With the help of a joint optimization scheme, we unite the problems of capacity allocation and content placement in a hierarchical cache-enabled architecture. We define the formulation of the joint problem to maximize the reduction in energy consumption. Two heuristic algorithms proposed in this paper to reduce the complexity of the problem. Extensive simulations have been performed to prove that our proposed scheme can dynamically adapt to changes in the request rate and outperform existing schemes in terms of energy savings.