Date of Publication :7th March 2016

Abstract: The Wi-Fi offloading with delay-tolerant applications under usage based pricing is the major problem in cellular data usage. We aim to achieve a good tradeoff between the user’s payment and its QoS characterized by the file transfer deadline. A general Delay-Aware Wi-Fi Offloading and Network Selection (DAWN) algorithm for a general single-user decision scenario was used. We then analytically establish the sufficient conditions, under which the optimal policy exhibits a threshold structure in terms of both the time and file size. As a result, we propose a monotone DAWN algorithm that approximately solves the general offloading problem, and has a much lower computational complexity comparing to the optimal algorithm. Simulation results show that both the general and monotone DAWN schemes achieve a high probability of completing file transfer under a stringent deadline, and require the lowest payment under a non stringent deadline as compared with three heuristic schemes.

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