Screen-Off Traffic Characterization and Optimization in 3G/4G Networks
Today's cellular systems operate under diverse resource constraints: limited frequency spectrum, network processing capability, and handset battery life. The authors consider a novel and important factor, handset screen status, i.e., whether the screen is on or off, which was ignored by previous approaches for optimizing cellular resource utilization. Based on analyzing real Smartphone traffic collected from 20 users over five months, they find that off-screen traffic accounts for 58.5% of the total radio energy consumption although their traffic volume contribution is much smaller. Such unexpected results are attributed to the unique cellular resource management policy that is not well understood by developers, leading to cellular-unfriendly mobile apps.