於Android智慧型手機以近場通訊啟用藍芽資料傳輸之研究

Abstract

藍芽技術從1999年推出後，雖有短距離高速資料傳輸的功能，但其設定步驟之繁複，儘管智慧型手機配備了藍芽技術，但仍使許多不黯科技產品的使用者仍視為畏途。自從2010年Google推出首支內建近場通訊(NFC)的Android智慧型手機Nexus S後，其簡單與易用特性，使近場通訊的應用與相關的研究如雨後春筍般地被推出。近場通訊技術除了資料傳輸之外，也可以透過控制指令的傳送來取代藍芽技術的前置動作，降低操作的複雜度，藉以增加該通訊技術的使用性。如何利用NFC來擴充與改善藍芽的技術應用為重要課題。 本研究提出以近場通訊的點對點模式，啟用藍芽的連線與資料傳輸，可節省設定時間，且使用者不必具有連線先備知識。因應官方SDK無提供藍芽傳輸檔案的狀況，本研究發展出文字基底的傳輸檔案模組，進一步比較點對點模式與藍芽傳輸檔案的時間，結果顯示，在小於4KB時，使用點對點模式較省時，成為兩種技術的分水嶺。我們依據所發展出來的模組，開發出三項應用：孩童走失警示、繪圖接龍、翻牌遊戲。孩童走失警示系統可以偵測小孩是否距離超過藍芽連線距離，超出則響鈴提醒。繪圖接龍為兩人開啟藍芽連線，用接力的方式完成圖畫和紙筆遊戲，翻牌遊戲則是玩法類似記憶遊戲，並利用藍芽即時同步遊戲的狀態。

Bluetooth technology was proposed in 1999. Although it can transmit in high speed within short range, nevertheless the setting procedure is complicated for users. Since Google launched the first near-field-communication (NFC) smartphones on the Android platform, the simplicity and friendly design of its user-interface makes related applications sprang up like mushrooms. NFC provides data transmission between smartphones. Beside data transmission, NFC also can activate Bluetooth communication between two smartphones by tapping the back of these two smartphones, which can reduce the complexity of Bluetooth setting procedure. In this thesis, we develop a system which can set up Bluetooth transition automatically by using NFC P2P mode. To cope with the problem that official SDK doesn’t provide the method of transfer files by Bluetooth, we design a text-based file transfer module. Further, we compare our module with NFC P2P mode, the result shows that 4 KB is a crossover point between NFC and Bluetooth. If file size of the data transmission is less than 4KB, then NFC provides better performance; if file size is greater than 4KB, then Bluetooth provides better performance. We also developed three applications which are based on our NFC activated transmission modules, they are “Child Guard”, “Draw Together”, and “NFC memory game”. “Child Guard” is a Bluetooth-based parent assisted software which can warn parents when their child stays in the distance more than Bluetooth reachable distance. “Draw Together” provide two users take turns to draw pictures on their smartphones. “NFC memory game” is the same as classic poker game, which matches colors in the poker cards, but the game state is synchronous using Bluetooth communication.