一個智慧型網路語音服務品質提供系統

Abstract

寛頻網路服務及家用閘道器的普遍化造就了家庭網路使用者的廣泛相關應用，藉由網際網路承載語音的免費或低價網路電話是即時網路傳輸主要的應用之一。然而當同一個使用下的家用閘道器，即時網路傳輸（如：網路電話）如果和其它的網路相關應用服務在同一段時間發生，必定會造成對內及對外的頻寛資源要求的衝突與競爭，進而造成維持可接受即時網路傳輸服務品質的困難。本論文中提出了方法來解決即時網路傳輸網路服務品質提供系統的三個重要基本需求（計算對外可用頻寛資源，對外頻寛的流量控制以及對內流量壅塞控管），並在家用閘道器上實現智慧型網路語音服務品質提供系統以針對SIP網路電話做即時傳輸的品質控制，藉以驗證所提出方法的正確性及可行性，進而提出一可廣泛地應用在家用或企業用閘道器做其相關之即時網路傳輸品質控制之方案。

Experiencing the rapid growth of broadband infrastructure and the wide deployment of the residential gateway, various Internet applications are getting more popular for home users. VoIP is one major real-time streaming application used to carry voice data over the IP network and provides the users with free or low cost phone service compared to the traditional PSTN service. To maintain the acceptable end-to-end delay and packet loss for the real-time streaming applications becomes a challenge for the home users behind the residential gateway in case the real-time streaming packets are competing with the non-priority packets to access the limited bandwidth in the egress or ingress directions. Three effective algorithms are proposed to address the egress bandwidth measurement, egress traffic shaping and ingress traffic congestion avoidance, which are commonly required by the residential gateway for the service quality provisioning system for general real-time streaming applications. SQPV (Smart QoS Provisioning System for VoIP) is a service quality provisioning system with these three algorithms implemented and specifically deals with SIP/RTP sessions to demonstrate the result. These algorithms are proposed and able to be leveraged to support the service quality provisioning system for different real-time streaming applications.