節能減碳一直以來都是人類所關心的問題，電力的節省就顯得相當重要，現今的電力系統透過資訊、通訊與自動化科技，來建置具智慧的發電、輸電、配電以及用戶電力監測等功能，進而形成智慧化電力網路，使得電力系統運轉效率、供電品質與可靠性提升，此電力網路稱之智慧電網(Smart Grid)。然而，為達成家庭配電的控制與監測，無線感測網路(wireless sensor network; WSN)扮演非常重要的角色。
無線感測網路是由數個感測節點所組成的，每個感測節點具有感測周遭資訊能力，並經由無線方式進行傳輸，而無線感測網路具有省電、低成本以及支援大量網路節點的特性，恰好符合智慧電網中家庭區域網路(home area network; HAN)的硬體需求。在通訊協定上，IEEE 802.15.4標準定義無線感測網路實體層與媒體存取控制副層的運作，使得智慧電網的通訊協定有明確規範可使用。
在智慧電網之家庭區域網路中，智慧電表與智慧裝置彼此之間互相傳遞訊息以交換各電器的用電狀況以及控制訊號等資訊，為了使控制訊號與資料能夠及時到達目的端，智慧電網標準規範其通訊系統中的訊號類型與服務品質(quality of service；QoS)要求，其中最重要的是各類型訊號的可容忍延遲時間，若訊號無法在標準所訂定的時間內送達，其可能造成財產損失及人員的傷亡。在IEEE 802.15.4標準中，並無針對傳輸服務品質進行規範以至於無法滿足智慧電網中對通訊系統服務品質的要求。
因此，本論文將針對智慧電網家庭區域網路中的控制訊號及資料，提出一有效的智慧電網家庭區域網路傳輸機制(efficient transmission mechanism for HAN smart grid; ETHS)，針對不同優先權之訊號與資料使用不同的傳輸方式，以達到各訊號類型與等級之規範，並提升其高優先權訊號之傳輸效率。

The resources of the earth are finite. In order to use the energy more efficiency, modern electricity systems use information, communication and automation technologies to implement the smart electricity generation, transmission and monitoring, called smart grid. Moreover, in order to achieve the smart monitoring and control for smart grid applications, wireless sensor network becomes important.
Wireless sensor network is composed by sensor nodes, each sensor node has a capability of sensing and transmitting information in wireless environment. Wireless sensor network has low power consumption, low cost, and support large number of network nodes. Those features fit the requirements of hardware in this smart grid home area network. In the communication protocol, IEEE 802.15.4 standard defines the physical layer of wireless sensor networks and media access control sublayer operation, making the smart grid has a clear protocol specification can be used.
In the smart grid home area network, smart meter and smart devices would transmit messages between each other to exchange appliances power status, electricity situation and various control signals. In order to make these control signals can reach the destination in time, standard specified its communication system signal type and QoS (quality of service) requirements, the most important requirement is the various types of signal delay that can be tolerated. If the signal cannot reach the destination in time, it could cause property damage and personnel casualties. In the IEEE 802.15.4 standard does not regulate this information.
To solve the above mentioned problems, this thesis proposes the ETHS (Efficient Transmission Mechanism for HAN Smart Grid) mechanism. ETHS uses different transmit methods to adapt different priorities to achieve specification and improve transmission efficiency of high priority signals.

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