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Following fast growth of cellular networks, more users have drawn attentionto the contradiction between dynamic user data traffic and static data plans.To address this important but largely unexplored issue, in this paper, wedesign a new data plan sharing system named Prometheus, which is based on thescenario that some smartphone users have surplus data traffic and are willingto help others download data. To realize this system, we first propose amechanism that incorporates LT codes into UDP. It is robust to transmissionerrors and encourages more concurrent transmissions and forwardings. It alsocan be implemented easily with low implementation complexity. Then we design anincentive mechanism using a Stackelberg game to choose assistant users ($AUs$),all participants will gain credits in return, which can be used to ask forfuture help when they need to download something. Finally real environmentexperiments are conducted and the results show that users in our Prometheus notonly can manage their surplus data plan more efficiently, but also achieve ahigher speed download rate.

Prometheus: LT Codes Meet Cooperative Transmission in Cellular Networks