https://scholars.lib.ntu.edu.tw/handle/123456789/148182
標題: | 即時互動應用程式的服務品質提供:從網路效能到使用者滿意度 QoS Provisioning for Real-Time Interactive Applications: From Network Performance to User Satisfaction |
作者: | 陳寬達 Chen, Kuan-Ta |
關鍵字: | 線上遊戲;網路電話;服務品質;Online Games;VoIP;Skype;QoS | 公開日期: | 2006 | 摘要: | 近幾年來,因為即時互動應用程式(例如線上遊戲)的流行,如何為這類型應用程式提供好的的服務品質提供已成為重要的研究主題。然後,由於目前的網際網路本身並不提供服務品質保證,再加上這類型應用程式的特性-即時性、互動性以及雙向資料傳輸-這些因素加總起來,使得即時互動應用程式的服務品質提供成為一個十分困難的任務。 要為網路應用程式提供高滿意度的使用經驗的困難之一是,不像系統層面的效能指標,例如頻寬或延遲時間,使用者滿意度是抽象而且不可量測的。要解決這個問題的關鍵是,我們必須能夠客觀並有效率地測量使用者對於網路效能的感覺。 我們在這篇論文裡從各個層面來探討要為即時互動應用程式提供服務品質的問題。因為下述原因,我們把研究焦點放在兩種應用程式,網際網路電話(Voice over IP),以及線上遊戲。首先,它們皆被認為是自從World Wide Web流行之後少見的殺手級應用,而且也是許多網路用戶最常使用的軟體。第二點,更重要的是,大眾使用電腦以及網路的主要動機通常脫離不了人際溝通以及娛樂,而網路電話及線上遊戲正是能夠滿足這兩項需求的代表性應用。 我們的研究可大略分為兩部分。第一部分,我們徹底地分析線上遊戲所產生的網路流量。我們的研究目的是發現及確認潛在的效能問題,為日後開發高效能網路遊戲平台建構更穩固的基礎。第二部分,我們嘗試為網路電話及線上遊戲使用者對於網路品質的「感覺」進行客觀地量測。我們的目標是為即時互動應用程式定義客觀的使用者滿意度指標,做為服務品質提供的最佳化基準。 我們的主要貢獻可分為三點:(一)我們指出目前線上遊戲的潛在效能問題,並且提出各種可能的解決方案;(二)我們提出可從使用某項服務的時間,例如玩線上遊戲的時間或者講電話的時間,來推論使用者對於網路服務品質的感覺。另外我們也為Skype應用程式提出一項基於網路品質的使用者滿意度指標,並且提出驗證方法;(三)我們為目前普遍存在網路遊戲的作弊行為-使用機器人程式來進行遊戲-提出解決之道,我們提出的方法特色在於能夠推廣到其它的遊戲,並且能抵擋來自機器人程式設計者的反制。 In recent years, QoS (Quality-of-Service) provisioning for real-time interactive applications, such as online gaming, has been actively discussed because of the popularity of such applications. However, the design of non-QoS-enabled Internet and the requirement of real-timeliness, interactivity, and bi-directionality of the applications together make the goal of QoS provisioning immensely challenging. One of the main obstacles to provide satisfactory user experience for network applications is that, unlike system-level performance metrics, such as bandwidth or latency, user satisfaction is intangible and unmeasurable. The key to this problem is to measure users' opinions about network performance objectively and efficiently. We endeavored in this work to explore the problem of QoS-provisioning for real-time interactive applications in a number of aspects. We aim at two applications, VoIP and online gaming, as our target of study for two reasons. First, they are considered killer applications since the emergence of World Wide Web, and have been part of the primary reasons people use the Internet. The second and more important reason is that, interpersonal interaction and entertainment are usually the goals for the mass to use the computer and Internet, where VoIP and online gaming could be seen representative applications that fulfill those fundamental demands. Our work is classified into two parts. In the first part, we thoroughly analyze the traffic generated from online game playing. We aim to identify potential performance bottlenecks that could be served a basis to develop more efficient network infrastructure for such applications. In the second part, we strive for emph{objectively} measuring the users' perception when using VoIP and gaming applications based on the network conditions the users experience. Our goal is to define a objectively assessable metric for QoS-provisioning of real-time interactive applications through the mapping from system-level performance metrics to user-level satisfaction measures. Our main contributions are three-fold: 1) We pointed out the potential performance problems of online gaming and proposed some possible solutions; 2) We proposed to infer users' awareness of network QoS by the time they spend on a service, e.g., game playing or Internet phone. Also, we proposed and verified a user satisfaction measure for Skype, which is computed based on the network conditions users experience; 3) We proposed a number of strategies to cope with the prevalent but undesirable use of online game bots, where our methods are shown generalizable across different games and robust under counter-attacks from bot developers. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/53111 | 其他識別: | en-US |
顯示於: | 電機工程學系 |
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ntu-95-D91921008-1.pdf | 23.31 kB | Adobe PDF | 檢視/開啟 |
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