摘要
在Internet迅速發展的今天，人們非常關注如何能夠高效、高質量地傳輸Internet業務以及實時多媒體業務。傳統Internet是一種盡力而為的服務方式，已不能適應一些新業務（如I P 電話、傳真、電子商務等）對服務質量的要求，IP QoS的研究成為目前的熱點。因此，通信網絡的仿真，成為通信領域的熱點問題。如何高效地建立網絡模型，如何對網絡模型進行修改以提高其性能，如何提高 IP QoS等，都需要網絡仿真。而OPNET則是當前網絡仿真以及分析領域一種十分優秀的軟件，特別是在優化通信網絡和提高網絡效率方面有十分顯著的效果。
本文首先介紹了IP QoS的基本概念，其次分析了IP QoS的關鍵技術，如綜合服務模型、區分服務模型以及主要的實現技術等，并就各種實現方法的特點進行了總結。最后使用OPNET仿真軟件構建基于IP QoS技術的網絡模型，對其性能進行仿真。因此，IP QoS技術的研究具有一定的現實意義。
關鍵詞：IP QoS 網絡仿真 OPNET
Abstract
With the current boon in Internet usage special due to its proliferation into business, there is a greater and more urgent need for the transmission of efficient and high-quality service and real-time multi-media service. Traditional IP is a best-efforts service, now it can not fit for some new services (For example, IP phone, IP Fax, electron commerce and etc.) of Quality of Service. Quality of Service has been a research issue in society. Thus the communications network simulation, become a hot issue. How to make a network model, how to modify the network model to improve the function and how to improve the Quality of Service of IP network need network simulation. Then the OPNET is very excellent network simulation software, especially in optimization communication network and raising network efficiency.
This paper firstly introduces some basic concepts about QoS .Secondly the paper analyses several key technique, such as Integrated Services, differentiated services and achievement techniques of QoS and so on. And the paper summarizes the traits of these achievement techniques. Finally the paper introduces the principle of OPNET software usage. Using OPNET simulation software builds the network which is on the basis of IP QoS technique and simulates the performance of the network. So, the research of the IP QoS technique has certain meaning of the realism.
