近年來我國的3G滲透率持續成長，再加上以iPhone為首的智慧型手機之興起，造成行動數據服務的流量急劇成長，不過由於各大電信業者擴建及升級3G基地台的腳步無法趕上此一數據流量快速攀升的情況，以及業者廣泛提供吃到飽的上網費率、接收了過多的客戶，致使基地台容量不足以供應使用者的傳輸需求，因此常有連線速率緩慢甚至斷線的情形發生。
本研究首先參考國外對於容量不足的解決措施，歸納出影響3G行動網路容量之因素為基地台數、頻譜數、用戶行為以及服務品質。由於基地台和頻譜的增加需要較長久的時間，本研究認為限制用戶數為目前較可能的解決方法，因此，透過發展一計算業者可接收的用戶數之公式、評估業者可能提供的服務品質，本研究期能提供NCC管制各業者可接收的客戶數及評估業者服務品質之依據，並給予業者有關解決服務品質問題的方法參考，希望能維護與保障用戶行動上網的使用品質。
透過本研究的結果分析可知，於2011年底的基地台佈署下，當用戶的上網機率為20%時，若基地台用於數據服務的流量比例為40%或50%，業者可提供給顧客70Kbps的速率；若數據的流量比例增為60%，則是能提供接近200Kbps的速率。於基地台全部升級為HSDPA的情況下，當用戶的上網機率為50%時，若數據的傳輸流量比例是60%，業者也可支援用戶約200Kbps的應用服務，而上網機率增至70%時則是能提供70Kbps的服務品質。此外，在本研究所假設的各情境中，結果顯示業者A的服務品質可能較居於領先地位，而各業者所提供的傳輸速率都已符合NCC所訂定的服務品質標準。

The continuous increasing of 3G’s penetration rate and the rollout of iPhone or other smart phones has led to a rapid growth of mobile data traffic in Taiwan. However, the speed of dramatically increasing data transmission is faster than the expansion and upgrade of base stations by mobile operators. Moreover, all of the operators provide an unlimited data plan with flat-rate and receive too many subscribers. Hence, the capacity of 3G network cannot meet the demand of subscriber. Therefore, the rate of mobile data service is often slow.
This research reviews the measures of solving capacity shortage overseas, finding the factors that influent the capacity of 3G mobile system are the number of base stations, radio spectrum, subscriber behavior, and QoS (Quality of Service). Since it could take lots of time to add more base stations and spectrum, we think that limiting the number of subscribers is one of the possible methods to solve capacity problem. And then, we develop a formula to calculate the number of subscribers that operator can receive, evaluating QoS that operator may offer. We hope this research can provide the authority, NCC, with the method for managing each operator’s quantity of subscribers and QoS, and also could give some advices about the improvement of QoS problem to operators.
According to the results, with the number of base stations by the end of 2011, we found that when the possibility of subscriber using mobile data service is 20% and if data traffic uses 40% or 50% of total traffic volume, operators could provide 70Kbps to each customer; if the percentage of data traffic is 60%, then they could offer almost 200Kbps to customers. Furthermore, with the technology of all base stations is HSDPA, when the possibility of subscriber using mobile data service is 50%, and if data traffic of total volume is 60%, then operators could support their subscribers to use mobile application which needs 200Kbps. Also, operators could provide 70Kbps when the possibility of subscriber using mobile data service is 70%. In addition, the research results also reveal that the Qos of operator A is better than those of others. At last, all the three operators can offer the data rates of 64Kbps suggested by NCC.

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