次世代無線網路包括不同規格的通訊技術 (例如:UMTS~cite{yblinbook,barooah2013architectural}, LTE~cite{rumney2013lte}, WiMAX~cite{chiang2013performance}, and WiFi~cite{wei2013wifi}),這種由不同網路營運商 (Operator)所共同建構的網路稱之為異質網路 (Heterogeneous Networks~cite{DBLP:journals/bell/LingCCV13})。 手機使用者 (User)只需與網路營運商簽約並支付相關費用,就可透過各種行動裝置,同時享用各式各樣的網路及應用服務。預付是其中一種付費方式,能確保使用者不使用超過他們所能支付的服務。如何從理論層面中建立次世代無線網路的預付機制,從而安全和有效率地支付使用者同時使用中的各種服務,這是至關重要的研究。為應對這一挑戰,我們這篇論文提出了NSEP (A Novel Secure Micro Electronic Payment Model),並證明其達到最嚴謹的安全等級,以及分析其在通訊網路中之效能。
In the next generation wireless networks, heterogeneous network technologies (e.g., UMTS, LTE, WiMAX, and WiFi) coexist to provide users communications services. Users may use different terminals to access different Internet applications through different communication services simultaneously. The applications and communication services are owned by different operators. Users obtain the services/applications by making payments to their subscribed networks. Prepaid is one of the payment models, which ensures that users do not overuse the communication service or applications within limited credits. How to apply the prepaid model in the next generation networks such that user's credits can be securely distributed among different operators to support user's usage of different services at the same time is challenging. For the challenge, in this paper, we propose NSEP (A Novel Secure Micro Electronic Payment Model). We prove NSEP satisfies the security requirements and analyze the performance of NSEP in terms of signaling overhead.