在無線資訊系統中，廣播磁碟技術已經變成一個熱門的資料散播的方式。然而， 當有些因素，如週期性的斷線發生時，廣播的策略就需要告訴行動通訊使用者一個合 適的存取廣播資料的方法。本篇論文中，我們提出一個新索引架構AMI (accessmode Indicator)，使用者可以根據回復時間（tumaroundtime)決定連線（active)與睡眠 (sleep)的時間週期。我們的目標是發展一種利益導向（benefit-oriented)的資料擷取 協定，讓行動通訊使用者在有限的回復時間（tumaroundtime)內能夠在消耗少量電源 的情沉下，取得對行動使用者而言更多有價值的資料。經由實驗評估與驗證，我們提 出的AMI索引架構各方面的效能優於適用於廣播環境的改良式廣播索引架構，特別 在等待時間（waitingtime)的節省比率更高達75%。因此，運用我們的方法使用者不 但能利用更少的電力得到更多有價值的資料，而且等待時間的減少代表能得到更快速 查詢結果回應，那麼使用者可以將節省下來的時間用來處理其它的應用。

Broadcast disk technology has become a popular method for data dissemination in wireless information systems. However, when the factors such as intentional periodic disconnection are involved, a broadcast strategy needs to actively tell the mobile host (MH) a suitable access mode for retrieving the broadcast data. In this paper, we propose a new broadcast indexing structure AMI (Access Mode Indicator) such that mobile client can decide his active and sleep time period by his turnaround time. Our goal is to develop a retri-eval protocol so that a mobile host can retrieve more valuable broadcast information by consuming less power of a mobile device at a turnaround time. By performance evaluation shows that AMI substantially outperforms the traditional indexes (enhanced for wireless broadcast) and especially gets 75% saving on waiting time. Since 5 apply our approach mobile client can retrieve more valuable broadcast information by consuming less power. The decreasing waiting time represents mobile clients can g et query results more quickly and then they can have more time to do other applications.