本論文主要探討機器對機器裝置在蜂巢式網路的同步，其中包含了物理層同步以及媒體接入控制層的同步。物理層同步包括完成時間同步跟頻率同步，而媒體接入控制層的同步則包含系統資訊的協調跟註冊。根據現有的標準文件IEEE 802.16m，用戶端必須經由下載鏈結同步通道和非同步測距通道完成物理層同步，並在網路接取過程中完成媒體接入控制層同步。用戶端必須先完成同步才可以被允許進入網路。我們在本論文中，針對靜態機器對機器裝置位置固定不變之特性，提出一種新的方式，使得靜態機器對機器裝置能透過同步測距通道執行網路重新登入的動作。最後藉由模擬結果驗證，同步測距通道能提供比非同步測距通道更高的容量。

This paper firstly investigates synchronization issue of machine-to-machine (M2M) devices in cellular network systems, including physical (PHY) layer synchronization and media access control (MAC) layer synchronization. PHY synchronization involves timing synchronization and frequency synchronization. In addition, MAC synchronization involves system information negotiation and registration. According to the specification of IEEE 802.16m, the PHY synchronization can be achieved via downlink synchronization channel and non-synchronized ranging channel (NS-RCH) feedback channels. And moreover, MAC synchronization is accomplished through network access processes. Note that, synchronization has to be achieved before a mobile user is allowed to access the network. In this investigation, we propose that the fixed M2M devices can perform network re-entry through synchronized ranging channel (S-RCH). In addition, simulation results are conducted to show that S-RCH has higher capability than NS-RCH.