當有線網路已經發展成熟的同時，整個網路的發展趨勢是走向寬頻、行動化，以達到隨處可上網為目的。因此，無線網路技術成為現在炙手可熱的熱門話題，然而在目前的無線傳輸環境中，許多問題是在有線架構上看不到的，包含了無線平台的可移動性、電力、高封包遺失率及相較有線環境下的低頻寬，所以要在無線環境提供良好的服務品質，仍然有許多技術尚待克服。
這篇論文提出了一個整合差別服務在無線網路應用上的方法。在這個方法中，我們觀察無線環境的封包遺失情況，以及封包被轉送的次數，在擷取點上根據我們提出的滿意度計算公式，適當地提升封包的優先權值，使無線主機的封包在有線環境中，較不容易被丟棄。透過這個方法，可以提升無線主機上的使用者對網路品質的滿意度，並且對於整體的網路，可以節省下因為丟棄無線主機封包所浪費的資源。在模擬實驗中，我們測試了UDP及TCP資料流的不同組合，並且觀察比較單跳接網路和多跳接網路的差異，以找出在何種情況下，我們的方法會有最好的效果。 / When the wired network technologies are getting matured, the whole network trends are to develop "broadband" and "mobile" network infrastructure, and to enable everyone access the Internet everywhere. Therefore, the wireless network technology is a hot topic in current network research. However, there are many problems in the wireless network, including mobility of mobile hosts, battery power, high packet loss rate, and lower bandwidth that never appear in the wired environment. In order to provide good Quality of Service(QoS) in wireless environments, there are still many problems needed to be solved.
This thesis proposed a method to integrate Differentiated Service(Diffserv) and wireless networks. To provide certain QoS for mobile applications, we define a "satisfaction" formula. By monitoring the packet loss in the wireless environment, the number of times of packet forwarding, we can base on the formula to raise the priority of wireless packets. By doing this, we could improve the network quality of satisfaction for mobile users, and save the resource of the entire networks, which is wasted by dropping wireless packets. In the simulation, we tested the combinations of UDP and TCP data flows, and compared their performance in both single-hop and multi-hop wireless networks. The results gave us implications how to utilize the Diffserv for mobile applications under any circumstances.
| Identifer | oai:union.ndltd.org:CHENGCHI/A2002001573 |
| Creators | 黃世奇, Huang, Shih-Chi |
| Publisher | 國立政治大學 |
| Source Sets | National Chengchi University Libraries |
| Language | 中文 |
| Detected Language | English |
| Type | text |
| Rights | Copyright © nccu library on behalf of the copyright holders |
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