RSVP 網路中服務提供者與訂戶之成本效能分析

Abstract

今日網際網路的發展趨勢之一是以服務品質為基礎的網際網路，必須提供 多類別的服務以滿足不同應用軟體的需求。IETF 為此做了許多努力，也 為信號協定及整合服務制定了規格。除了資源保留協定（RSVP）以及有效 率的排程演算法之外，一個成本效能分析的研究也是必需的。在本篇論文 中，進行了同質與異質的資料－服務參數成本效能分析以及良好與保守的 許可控制的比較，注意到資料特性的暴現程度對於效能是一個重要的影響 因素，而網路服務提供者也應該將這個性質反應在計費制度中，對服務訂 購者而言，如果資料的暴現程度低，可以選擇使用保證式的服務，然而， 若資料是屬於暴現式的，那麼就要小心做選擇了，對服務提供者而言，最 重要的議題就是鑑別資料流的特性，它決定了如何對客戶計費。另一個重 要的議題是不同資料特性的影響，而在此篇論文中也做了一些研究。 One of the developing trend of today's Internet is QoS based Internet. Multi-class services should be provided to meet the requirements of applications.IETF makes efforts towards this goal and some specifications of signalingprotocol and integrated service are made. In addition to the Resource ReSer-Vation Protocol (RSVP) and efficient scheduling algorithms, a study on cost and performance engineering is necessary. In this study, a cost and perfor-mance engineering on homogeneous and heterogeneous traffic-service characterization and a comparison between a well-performed and conservative admission control is made. It is remarked that the burstiness of the traffic characterization is an important factor to the performance, and the billing policy of ISPs should reflect this attribute. For service subscribers, with a low bursty traffic, choosing Guaranteed Quality Service is reasonable. However, be careful to make this decision if the traffic is bursty. For service providers, the most important issue is to identify the characterization of the traffics. It decides how to charge the customers. Another important issue is the impact of the characterization of different traffics, and it is also studied in this study.