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To accommodate the explosive growth in mobile data traffic, both mobilecellular operators and mobile users are increasingly interested in offloadingthe traffic from cellular networks to Wi-Fi networks. However, previouslyproposed offloading schemes mainly focus on reducing the cellular data usage,without paying too much attention on the quality of service (QoS) requirementsof the applications. In this paper, we study the Wi-Fi offloading problem withdelay-tolerant applications under usage-based pricing. We aim to achieve a goodtradeoff between the user's payment and its QoS characterized by the filetransfer deadline. We first propose a general Delay-Aware Wi-Fi Offloading andNetwork Selection (DAWN) algorithm for a general single-user decision scenario.We then analytically establish the sufficient conditions, under which theoptimal policy exhibits a threshold structure in terms of both the time andfile size. As a result, we propose a monotone DAWN algorithm that approximatelysolves the general offloading problem, and has a much lower computationalcomplexity comparing to the optimal algorithm. Simulation results show thatboth the general and monotone DAWN schemes achieve a high probability ofcompleting file transfer under a stringent deadline, and require the lowestpayment under a non-stringent deadline as compared with three heuristicschemes.

DAWN: Delay-Aware Wi-Fi Offloading and Network Selection