無線傳輸技術，如Wifi、藍芽等在現代應用上相當廣泛。而有些無線傳輸的裝置本身在體積跟資源上受到限制，例如只有有限的電力供應、有限的硬體資源、計算能力受到限制。這類的裝置如果應用在對於時間順序有嚴格要求的系統中，則各個裝置上的時間同步便成為一大考量與挑戰。由於硬體時鐘在各個裝置並不會完全一致，各個裝置的時間處於非同步的狀態，對於應用於監視系統、資料庫處理或是軍事用途上，若在事件發生時，便無法確定事件發生的先後順序。 本研究針對藍芽裝置上的時間同步機制進行探討。此處的藍芽裝置為一個裝置配有藍芽晶片或是外部裝載藍芽dongle，透過藍芽進行時間同步。本研究目標在於找出可行且有效的時間同步機制，能應用在有限硬體資源的裝置上。時間同步機制不應對於裝置的計算能力造成過多負擔，從而使硬體資源分配不均。 Wireless technologies, such as Wifi, Bluetooth, are common in modern times. Since it is wireless, there are fewer limits on where to install the devices equipped with the wireless technology. Some wireless devices are limited in dimensions and resources; for example, the limited power supply, limited hardware resources, weak calculation capability. Clock synchronization will be a major concern and challenge while such devices apply for the system which has a strong demand in timing sequence. This research focuses on the clock synchronization on the Bluetooth devices. Bluetooth devices are defined as devices that are connected with Bluetooth chips or external Bluetooth dongles. The goal of this research is to look for a valid and achievable mechanism for synchronization and it could be applied for devices which have limited hardware resources.
