近年來行動寬頻市場的需求呈現持續性的成長，為了能應付更多更快的速度需求、符合用戶的期望，業者需要更多的頻寬來支援，隨著科技的發展和頻寬需求的增加，目前各國正在著手進行投資第四代通訊技術，而台灣目前也正著手4G的投資商轉規劃，且國家通訊傳播委員會表示，將在2013年釋出4G行動寬頻業務執照，包括700MHz、900MHz、1800MHz三種頻段，總頻寬135MHz*2，並以5MHz*2為單位進行執照拍賣，因此，本研究參考相關文獻，歸納出影響4G行動通訊系統容量之因素，發展計算業者在投資建置4G時，所需頻寬之公式來進行評估。
本研究經過文獻探討，歸納出評估LTE容量所應考慮的因素為服務品質、用戶需求面及業者供給面，而這三個構面，並不是單向的，如果知道用戶需求面及一定的服務品質便能推估符合需求的頻譜數量，反之亦然。因此本研究希望能探討台灣未來建置4G時，業者應提供多少的頻譜量來滿足用戶需求。
透過本研究分析結果，當用戶上網機率為20%時，因為凌晨到早上這段時間需求較低，而照這個時段的用戶大部分都在住宅區，因此住宅區為95%、商業區為5%，另外，阻塞率的高低，也會影響到所需的頻寬，若以阻塞率為1%來看，並用4G及WiFi來進行流量傳輸，當4G負責傳輸流量為80%時，最高需求頻寬為2*36.6 MHz，若傳輸流量大部分由WiFi分擔流量，4G傳輸流量為30%時，最高所需傳輸頻寬為2*13.7 MHz。

The mobile broadband market has continued to grow to meet the more demands and the expectations of users. Hence, mobile operators require more and more spectrum to support the demands of consumers. With the technology evolution and the increment in bandwidth, many countries including Taiwan are working to invest the fourth generation (4G) mobile communication systems. In 2013, Taiwan would auction 4G mobile broadband spectrum, including 700MHz-, 900MHz-, and 1800MHz-bands. The total bandwidth is 135MHz*2 with a basic unit of 5MHz*2. Therefore, this research will review the relevant literature, summarize the factors affecting 4G system capacity, and develop a few formulas to calculate the required spectrum.
This research finds the factors that affect the capacity of 4G mobile system are the QoS (Quality of Service), the traffic demands of users, and the number of base stations and allocated spectrum. If the user demands and QoS are known, we are able to estimate the amount of spectrum. Therefore, this study attempts to derive the required spectrum that can satisfy user needs for Taiwan’s 4G service.
According to the results, when the probability of subscribers using mobile data service is 20%, blocking rate is 1% and data traffic for 4G transmission is 80%, a mobile operator should provide the spectrum of 2*36.6MHz. Also, when the ratio of 4G transmission is 30%, the required bandwidth is 2*13.7MHz. According to the findings, we know that the higher the user demand, the more bandwidth is required.

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