全IP網路中以預算為基礎之端對端服務品質管理


Budget-Based End-to-End QoS Management for All-IP Networks


陳建同

面對通訊與資訊科技的大幅進步、網際網路的蓬勃發展、以及電信自由化帶來的激烈競 爭, 通訊網路正在進行一個巨大的變革, 企圖將原有Circuit Switching 與 Packet Switching 網路整合成一個單一整合型網路 -All-IP網路以支援所有的應用服務。 All-IP網路受限於封包交換網路原有的特性,有服務品質問題(QoS)有待克服, 因此有必要在All-IP網路上提供服務品質管理機制以實現整合型網路的目標。 而要提供適當的QoS 管理,其成功之關鍵主要在於是否能提供一個簡單易行之架構。 本論文先提出BBQ(Budget-Based QoS)採用以預算為基礎之服務品質管理, 以簡化管理、追求效率,不增加管理複雜度為原則。 BBQ提供一個高適用性的管理架構和相關的管理工具, 可適用於不同的下層網路架構和不同營運目標的網管政策。 本論文為提出在BBQ管理系統中之端對端服務品質解決方案。 透過承載服務的概念,端對端之服務由接取網路和骨幹網路之承載服務提供支援。 本論文依據分層負責的精神提出一系列的資源規劃及路徑建構方式,提高網路資源運用 效率, 並可快速的以即時方式建構具服務品質保證的端對端路徑給使用者。 骨幹網路由許多核心網路相連而成, 各個核心網路各自獨立規劃內部路徑而端對端的路徑規劃只需選擇所欲通過的核心網路 即可, 計算量可大幅降低,因此可適用即時的路徑建構。 路徑規劃之研究重心為如何挑選最佳核心網路路徑,以規劃具服務品質之端對端路徑並 可達到資源之最有效利用。

In response to the great progress of communications and computer technologies, aggressive deployment of broadband fiber optical network, advance of Internet technology, and the global standardization of IP technology, the telecommunication industry is moving toward a converged network, which uses a single global IP based packet-switching network to carry all types of network services. Diverse types of services demand diverse QoS requirements making it a great challenge to support potential services with guaranteed QoS on All-IP networks. Our research group proposes a Budget-Based QoS (BBQ) management architecture to facilitate network operators of diversified networks. With BBQ management architecture, network operators can adjust their network architectures and management polities to support as many services as possible with end-to-end QoS guarantee. In this thesis, based on BBQ QoS architecture, We propose an End-to-End QoS solution in BBQ management system. By bearer services concepts, a End-to-End service is decomposed into Backbone and Stub Network bearer services. Each subnetwork will carry the responsible bearer service with committed QoS quarantee. Based on the proposed hierarchical management infrastructure, we design a methodology to allocate resource and path planning in a progressive manner. This methodology will give network operators sufficient time to configure and deploy networks according to long time demand forecast. Furthermore, it allows admission controller to efficiently acquire resource in real time in admitting a service with end-to-end QoS guarantee. Because each Core Network plans its own internal path independently, End-to-End path planning is only to choose Core Networks to pass through. This scheme could reduce the enormous computation overhead such that it is adaquate for real time path setup. One critical challenge is to choose the best End-to-End paths with QoS quarantee for incoming service requests in terms of optimal resource utilization. We have developed a mathematical programming method to solve the problem. The simulation evaluation show that our optimizaiton ............