在第三代合作夥伴計劃（3GPP）標準中，機器對機器協定被稱為機器類型通訊（MTC）。在長程演進計畫（LTE）中，追踪區域(TA)由多個細胞（基地台的覆蓋範圍）所組成，而追蹤區域列表（TAL）則由多個跟蹤區域所組成，追蹤區域列表是用來確認機器類型通訊設備所在的位置。中央策略是一種分配追蹤區域列表的概念，也就是以機器類型通訊設備所在的追踪區域為中心來分配追蹤區域列表。傳統的中央策略，是以追踪區域(TA)為單位來進行分配追蹤區域列表，主要是考量的是高移動性的設備，所以相對於低移動性的機器類型通訊設備會不適合。
於是我們以低移動性的機器類型通訊設備為考量對象，提出了一個以細胞(cell)為單位分配細胞列表(cell list)的中央策略。本篇論文探討以追踪區域(TA)為單位和以細胞(Cell)為單位的中央策略的效能。我們的研究表明，以細胞(Cell)為單位的方法可以在差不多更新區域的次數下減少呼叫訊息所造成系統的負擔。

In 3rd Generation Partnership Project (3GPP) standard protocol, the M2M protocol is called Machine Type Communication (MTC). In Long Term Evolution (LTE), the cells (the radio coverage of base stations) are grouped into the Tracking Areas (TAs), and TAs List (TAL) includes a list of TA identity. The location of the MTC device is tracked at the TAL level. Central policy is a concept that allocates the TAL whose central TA is the MTC device currently resides. Traditional central policy which is TA-based assignment focuses on tracking high mobility devices, which is not suitable for MTC devices with low mobility feature. We propose Cell-based central policy location assignment whose location is tracked at the Cell list level for MTC devices with low mobility feature. This thesis investigates the performance of the location assignment with TA-based central policy and Cell-based central policy. Our study indicates that the Cell-based central policy can reduce the paging cost for TA-based central policy under the same location update cost.

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