“…As a result, many prior works proposed QoE-related things by using objective QoE metrics. QoE metrics can be estimated from various factors : network delay and quality, [50], [61], [62], [63], [77], [78], [64], [54], [6], latency [79], energy consumption [80], [81] processing and completion time [82], resource states [83], [81], contentrelated metrics (e.g., voice, video, image) [84], [85], [86], [87], and user-related metrics [49], [81] User and Context related IFs : gender, age, social, characteristics, education, user location (e.g., home, workplaces), live style, background, usage history, living environment, workplace, job, personal interest, memory experiences user engagement metrics : user background and profiles, number of downloads, average visit time, screen views per visits, retention rate, number of active users, user event tracking (e.g., search history), user satisfaction metrics (e.g., app rating, touch heatmap, in-app feedback), user perception metrics (app crashes, speed, latency) [49], [50], [51], [52], [53], [54], [6], [55], [51] marketing strategies and tuning designs for users e.g., machine learning approaches for tailor-made experience for each user Application (Contentrelated)…”