近年來，裝置對裝置通訊 (Device-to-Device Communication) 吸引了許多人的注意力，因為它不需要基地台 (Access Point) 就能直接溝通。隨著裝置數量的增加，使用者想要利用裝置對裝置通訊的好處，進而讓使用者更有效率地使用資源。Wi-Fi直連（Wi-Fi Direct）是一種基於隨意網路 (Ad hoc) 的協定，旨在加速裝置間連線和通訊。然而，這些利用Wi-Fi直連實作的程式大多需要使用者手動設定，與裝置對裝置加速通訊的目標互相矛盾。並且，這些實作缺少路由 (Routing) 功能。在本篇論文當中，我們提出能夠自動化建立的跨群組通訊和基於無線自組網按需平面距離向量路由協議 (AODV) 的路由功能。除此之外，整體的方法能夠運行在未修改Android作業系統的行動裝置上。整體方法由兩部分組成，跨群組連線和繞徑實作。實驗結果顯示我們提出的方法能夠運行在市面上的智慧型手機裝置，並且減少網路壅塞。

Nowadays, Device-to-Device (D2D) communication, in which devices could communicate with other devices without existence of infrastructure, has drawn plenty of attention. Due to the rising number of devices, users tend to take the advantage of D2D communication, providing an efficient way to allow users to reuse all kinds of resources, especially Wi-Fi Direct. Wi-Fi Direct is a technology standardized by the Wi-Fi Alliance to facilitate the connection between devices without the presence of an Access Point based on IEEE 802.11. However, almost all of the implementations based on Wi-Fi Direct in these days require of manual setup, contradicting to the objective of D2D network that devices could be formed dynamically and automatically. In addition, many of them are lacking of routing functionality. In this thesis, we propose a method to automatically establish connections among groups and further construct routing path based on Ad hoc On-Demand Distance Vector Routing (AODV). Furthermore, this method could apply to non-rooted Android mobile devices. Our method consists of two stages—Cross-groups communications, and Reactive routing. Experimental results show that our method, on top of Android platform, could reduce the number of the packets among the network in comparison with flooding.

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