無線網路頻寬偵測器

Available Bandwidth Estimator in Wireless Networks

林春秀(Lin,Chunsiou)

指導教授 ： 朱元三

國立中正大學/工學院/電機工程學系/碩士(2012年)

摘要

由於無線網路快速的發展，使得多媒體傳輸的服務普及化，然而在視訊串流的傳輸上，頻寬偵測的機制是非常重要的，利用頻寬偵測的資訊可使用戶端達到高品質的服務。一個好的頻寬偵測機制需符合下列兩點：準確與快速。準確的提供目前可用頻寬以及快速的偵測時間。論文當中提出的頻寬偵測機制，利用PTR的技術並改善當發生封包遺失時頻寬偵測的準確度。論文中採用估算頻寬的方法和參數的取捨，有考慮到封包在網路遺失的情況，因此可提升頻寬偵測的準確性。在有線網路環境下，實測結果顯示，最高的平均誤差僅1.32%，而在無線網路環境下，最高的平均誤差為5.56%。針對在無線網路環境容易遺失封包，我們採用的方法可避免因封包遺失而造成偵測出來的頻寬產生大量的誤差，因此可提高準確性。在實測的結果，也證明本論文的方法優於其他頻寬偵測的工具。

關鍵字

可變封包長度 ； 可用頻寬偵測

並列摘要

The service of multimedia transmission becomes universal due to the rapid development of wireless networks. In the transmission of video streaming, bandwidth detection mechanism is very important. Using the information of bandwidth detection will make the clients to be high-quality services. A good bandwidth detection mechanism should include the two following characters, accurate and fast, which mean to provide available bandwidth accurately and fast detection. Bandwidth detection mechanism mentioned in the paper, uses PTR technique and improves accuracy when the occurrence of packet loss. Because of the consideration of packet loss in network, the methods used in estimating the bandwidth and parameter choice, significantly improve the accuracy of the bandwidth detection. In the wired network environment, the measured results show that the highest average error is only 1.32%. Though in a wireless network environment, the highest average error is 5.56%. For the easily packet loss of wireless network environment, the methods we adopted, avoid the large amount of error from bandwidth detection due to packet loss, can improve the accuracy. Our methods are proved to be superior to other bandwidth detection tools in measured results.

並列關鍵字

available bandwidth estimation ； variable packet size

參考文獻

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