Edge-Based Content Delivery for Providing QoE in Wireless Networks Using Quotient Filter

With an exponential increase in the data generation from various Internet-enabled devices, end user's demand satisfaction with respect to Quality of experience (QoE) has become a prime concern over the past few years. However, to assure QoE to the end users, content delivery networks (CDNs) aim to provide the content close to the user's geographical location so as to decrease network congestion, and latency along with an optimal bandwidth consumption. This paper proposes a popular content storage at the edge nodes/gateways instead of a remote server for increasing the data availability. For efficient cache management at the edge nodes, data is stored using Quotient filters (QFs), where number of QFs considered are determined by the number of categories taken for data segregation. To improve the accuracy and reduce the effort in caching process, one extra bit called timer-based metabit has been used with the QF, which helps to implement least frequently used caching efficiently. It has been experimentally proved that the proposed scheme has an approximate gain of 8.9% in object hit ratio with respect to the existing CDN based techniques. Moreover, the search time complexity of the proposed edge-based CDN is independent of the number of incoming requests.