普及運算的服務再未來是一種趨勢，而目前網路技術的發展中，已有越來越多的網路介面可供使用者所使用。假如我們的系統能夠整合這些網路的優點並且設計成一個能夠隨時隨地提供使用的多媒體檔案傳輸的服務，對於使用者來說會是非常的便利。在這篇論文中，我們將使用ZigBee (IEEE805.15.4), NFC (Near-Field Communication), Bluetooth (IEEE
802.15.1) 還有 Wi-Fi (IEEE 802.11)去設計一個檔案傳輸系統。除此之外，每個移動裝置都會根據系統目前的狀態自動的切換網路介面，像是省電或是需要高頻寬的資料傳輸。最後根據實驗結果，將可以看出我們系統上的優點。

Ubiquitous services are an inevitable trend of our future. Nowadays,
there are many wireless technologies that can be used and provide
services to mobile users. If we can integrate their respective advantages and design a system to create an ubiquitous multimedia environment, it will be very convenient for people. In this paper, we will use Zigbee (IEEE 802.15.4), NFC (Near-Field Communication), Bluetooth (IEEE 802.15.1) and Wi-Fi (IEEE 802.11) to design a system that is able to support mobile devices unremitting data transmission services. In addition, each mobile device (MD) can automatically switch between multiple wireless interfaces according to the proposed policies in terms of high bandwidth and power saving. According to the experimental results, the proposed method can demonstrate its advantages.

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