Web Caching on Smartphones: Ideal Vs. Reality
Web caching in mobile networks is critical due to the unprecedented cellular traffic growth that far exceeds the deployment of cellular infrastructures. Caching on handsets is particularly important as it eliminates all network-related overheads. The authors perform the first network-wide study of the redundant transfers caused by inefficient web caching on handsets, using a dataset collected from 3 million Smartphone users of a large commercial cellular carrier, as well as another five-month-long trace contributed by 20 Smartphone users. Their findings suggest that redundant transfers contribute 18% and 20% of the total HTTP traffic volume in the two datasets.