策略與計費控制系統之深度封包檢測成本與效能分析

Cost Analysis of Deep Packet Inspection in PCC Architecture

隨著行動裝置的普及，有越來越多的行動應用程式被開發出來，然而這些應用程式大多屬於Over-The-Top（OTT）應用程式，即由應用程式開發商所提供，僅使用電信業者的網路頻寬，這造成電信業者有非常大量的頻寬支出卻僅帶來極少量的收入。因此有非常多的電信業者嘗試加入深度封包檢測（Deep Packet Inspec-tion，DPI）的機制，將封包依其特徵賦予不同的Quality of Service（QoS）管理機制，然而對於路由器及整體系統來說，這將會是一個非常大的負擔。因此，在本論文中，主要分析深度封包檢測的機制對於整體系統的影響，探討在不同的偵測頻率下，對於封包的辨識率的影響，以期能夠達到在較低的成本下得到較高的封包特徵辨識成功率，以供電信商在建立深度封包檢測機制的參考依據。

Along with being more popular of the mobile device, there are more and more mobile applications have been developed nowadays. However among these applications are 'Over-The-Top (OTT)' applications which have been provided by the vendor of applications holds the biggest amount of them. And OTT merely use bandwidth which is offered by operators and this has caused operator have to afford a big amount of money for bandwidth but with very less income in return. Hence, here are many operators trying their best to join the mechanism of Deep Packet Inspection (DPI), and then assign the packets with different Quality of Service (QoS) rules according to their different kinds of signature. However to the router and backbones this will be a heavy burden. Consequently, this research mainly analyze how the mechanism of the DPI affects the Policy Control and Charging (PCC) System, and moves forward a step to investigate the rate of identification of DPI at different detecting rate in order to get the high successful detecting rate but with the lower payment. In conclusion, this research's main purpose is to build reference of DPI mechanism.