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In the past decade, smartphones and tablets became the most popular mobile devices. They contribute to a growing fraction of the Internet traffic, and this growth is planned to be exponential [14]. This kind of devices is usually able to be connected via WiFi and cellular networks. Then, the end-users expect to have their mobile devices capable to benefit seamlessly from all available interfaces. However, this coexistence between WiFi and cellular is much more complex and suffers from early design decisions of popular protocols.