Efficient Traffic Reduction in IoT Domains Using Bernoulli Scheduling of Proactive Cache Refresh

In this work we examine the tradeoffs involved in cache operation in an IoT domain controlled by a single Constrained Application Protocol (CoAP) proxy using IEEE 802.15.4 low power wireless personal area network technology. As the requirements for fresh data supplied to the clients and the reduction of traffic in the IoT domain are contradictory, a viable tradeoff is sought to obtain satisfactory performance. To this end, we compare the performance of a recently proposed group-based approach to that of a Bernoulli-scheduled, server-initiated proactive refresh, and show that the latter achieves superior cache hit ratio while offering substantial savings in terms of actual number of IoT domain messages exchanged.