Opportunistic content pushing via WiFi hotspots

Metro WiFi networks can be potentially leveraged to offload data traffic from congested cellular networks. In this paper, we design a content pushing system which pushes the content to mobile users through opportunistic WiFi connections. The system responds a user´s pending requests or predicted users´ future requests, codes these requested contents by using Fountain codes, predicts the user´s routes, and prelocates the coded content to the WiFi access points along the user´s routes. The content prelocation scheme is based on an order-2 Markov predictor and the connection duration statistics. Through simulations, we show that a significant amount of content can be delivered to mobile users through the proposed system.