近年來，越來越多研究學者開始研究探討如何在緊急急難現場提供緊急通訊的服務，在本論文中我們使用Wi-Fi Direct技術來達到可靠地通訊之目的，根據Wi-Fi Direct的規範，裝置需要加入一個Group才得以與其他裝置進行通訊，然而這樣子的通訊方式並不適用於災難現場的通訊，因為容易造成時間上的浪費以及能量的消耗，因此在本論文中，我們提出無須連接至群組的Wi-Fi Direct通訊方法來達成緊急通訊之需求，在所提出之方法中，我們額外設計了封包遺失處理程序來保證通訊的可靠性，以及兩種省電機制來減少裝置能量的消耗，以藉此延長裝置存活時間。我們的實驗與實做結果顯示，所提出之方法能快速且可靠的傳遞資訊，且達到電量節省之特性。 Recently, more and more researchers have investigated how to provide emergency communication services in scenes. In this work, we propose to use Wi-Fi Direct technology to achieve reliable communication in such scenarios. According to the Wi-Fi Direct specification, a device needs to join a group before starting communicating with other devices. However, this policy will cause the waste of time and energy consumption on communications. In this paper, we proposed a connection-less scheme to achieve emergency communication by Wi-Fi Direct. In the proposed method, we also design a packet loss handling procedure to ensure the reliability of communication, as well as two power-saving mechanisms to reduce the energy of the devices. Our experimental and simulation results show that the proposed method can quickly and reliably transmit information and achieve energy savings.
