臺灣博碩士論文加值系統

本研究利用實際部署無線區域網路案例，並透過一系列的實驗測試具有SDWN功能實驗組(Aruba AP)與不具有SDWN功能對照組(Rukus AP)來驗證SDWN機制的確可以確保high priority traffic (e.g., video stream)的服務品質，並且我們找出重要的SDWN操作參數以提供其他網路應用服務品質保證之參考。實驗數據中呈現當支援SDWN功能時，其實驗結果不論在接收封包總數、Inter-packet average spacing time及Inter-packet spacing time standard deviation都優於未支援SDWN的Test machine。當隨著增加灌入一般流量，具有SDWN功能實驗組的接收封包總數、Inter-packet average spacing time及Inter-packet spacing time standard deviation幾乎都沒有改變，而不支援SDWN的對照組的接收封包總數逐漸減少、Inter-packet average spacing time及Inter-packet spacing time standard deviation都是呈現逐漸遞增的趨勢。捕捉Inter-packet spacing time主要是來反映Inter-frame spacing time，當Inter-packet average spacing time越大，Inter-frame spacing time也會越大，Inter-packet spacing time standard deviation越大代表video播放時不穩定的現象越嚴重。我們也根據實驗結果建立了二個數學一般式來依實際流量需求調整決定SDWN最佳的High priority traffic設定比例，這個最佳設定比例可以避免保留太多high priority traffic的流量所造成之閒置浪費，如此不僅可以保證high priority traffic之服務品質，同時也可以儘量滿足normal traffic的流量需求。

In this paper, we deploy a Wireless Local Area Network (WLAN), which is Aruba WLAN, that supports the Software Defined Wireless Network (SDWN) to guarantee the Quality of Service (QoS) of the high priority traffic (e.g., video stream) traffics. We also deploy another WLAN, which is Ruckus WLAN, that does not support the SDWN for comparison. By performing a series of on-site experiments, we verify that the SDWN enabled WLAN is superior to non-SDWN enabled WLAN in terms of total number of received packets, the average of inter-packet spacing time and the standard deviation of inter-packet spacing time of video streams, especially in high network traffic load environments. In addition, we also identify the SDWN operational parameters to be applicable to the other QoS traffic requirements. By injecting more non-high priority traffic to the WLAN, it shows that the total number of received packets, inter-packet average time and inter-packet standard deviation remains almost the same in SDWN enabled WLAN. However, the total number of received packets is becoming lower and the inter-packet average time and inter-packet standard deviation are getting bigger for non-SDWN enabled WLAN. Measuring the inter-packet spacing time is to capture the inter-frame spacing time. Inter-frame space time plays an important role in measuring the quality of video streaming. The bigger the average of inter-packet spacing time, the bigger the average of inter-frame spacing time. Similarly, the bigger the standard deviation of inter-packet spacing time, the bigger the standard deviation of inter-frame spacing time. Large average inter-packet spacing time and large standard deviation of inter-packet spacing time will result in poor video streaming. Besides capturing the packet statistics of the video stream, we also developed two general mathematical formulations in determining the best ratio setting of high priority traffic in SDWN enabled WLAN to guarantee the QoS of high priority traffic and at the same time to accommodate non-high priority traffic as much as possible.

目錄
摘要 ii
Abstract iii
目錄 v
表目錄 vii
圖目錄 viii
第一章 緒論 1
1.1 研究背景與動機 1
1.2 研究目的 2
1.3 研究流程 3
第二章 文獻探討 4
2.1 軟體定義網路 4
2.2 軟體定義無線網路 7
2.3 QoS of SDWN 7
第三章 研究方法 10
3.1 實驗設計 10
3.2 SDWN硬體與系統架構 10
3.3 啟用Aruba SDN Application 12
3.4 測試軟硬體設備及流程 12
3.5 量測結果呈現 15
第四章 SDWN影音擷取與驗證 16
4.1 Wireshark擷取線上串流流量 16
4.2WebRTC影像語音流量測試 20
第五章 結論與未來研究方向 38
5.1結論 38
5.2 未來研究方向 39
參考文獻 40

表目錄
表2-1 SDN與傳統網路比較表 5
表3-1 Aruba Wi-Fi佈建使用軟硬體規格 11
表3-2 測試軟硬體需求 13
表3-3 二種無線基地台硬體規格 13
表4-1 Aruba無壓力測試流量Test Machine A and B結果 22
表4-2 Ruckus無壓力測試流量Test Machine A and B結果 23
表4-3 Aruba 50Mbps測試流量Test Machine A and B結果 24
表4-4 Ruckus 50Mbps測試流量Test Machine A and B結果 24
表4-5 Aruba 100Mbps測試流量Test Machine A and B結果 26
表4-6 Ruckus 100Mbps測試流量Test Machine A and B結果 26
表4-7 Aruba 150Mbps測試流量Test Machine A and B結果 27
表4-8 Ruckus 150Mbps測試流量Test Machine A and B結果 28
表4-9 Aruba 200Mbps測試流量Test Machine A and B結果 29
表4-10 Ruckus 200Mbps測試流量Test Machine A and B結果 29
表4-11 Aruba 250Mbps測試流量Test Machine A and B結果 30
表4-12 Ruckus 250Mbps測試流量Test Machine A and B結果 31
表4-13 Aruba 300Mbps測試流量Test Machine A and B結果 32
表4-14 Ruckus 300Mbps測試流量Test Machine A and B結果 32
表4-15 Aruba 350Mbps測試流量Test Machine A and B結果 34
表4-16 Ruckus 350Mbps測試流量Test Machine A and B結果 34

圖目錄
圖1-1 研究流程圖 3
圖2-1 SDN架構 4
圖2-2 軟體定義網路流量路徑 6
圖2-3 傳統網路流量路徑 6
圖2-4 傳統基地台QoS分類 8
圖2-5 應用程式層級QoS動態轉發 9
圖3-1 無線網路系統架構圖 11
圖3-2 Aruba SDN call flow 12
圖3-3 Iperf3與Test Machine架構圖 15
圖3-4 MCS及NSS值 15
圖3-5 Wireshark IO Packets 15
圖4-1 示範串流畫面 15
圖4-2 開始擷取封包 15
圖4-3 顯示對談流量 15
圖4-4 找出流量最高對談 15
圖4-5 設定過濾用戶端至伺服器雙向流量 15
圖4-6 過濾雙向封包 15
圖4-7 以I/O圖表呈現 15
圖4-8 I/O封包圖 15
圖4-9 I/O圖顯示雙向封包 15
圖4-10 I/O圖只顯示UDP封包最大延遲時間 15
圖4-11 確認WMM Shaping Policy啟用 20
圖4-12 Aruba QoS Correction偵測 20
圖4-13 包含DSCP標頭 21
圖4-14 Ruckus未套用DSCP標頭 21
圖4-15 Video quality comparison between Aruba and Ruckus(machine) 23
圖4-16 Received total packet comparison(machine) 23
圖4-17 Video quality comparison between Aruba and Ruckus(machine) 25
圖4-18 50Mbps Received total packet comparison(machine) 25
圖4-19 Video quality comparison between Aruba and Ruckus(machine) 27
圖4-20 100Mbps Received total packet comparison(machine) 27
圖4-21 Video quality comparison between Aruba and Ruckus(machine) 28
圖4-22 150Mbps Received total packet comparison(machine) 28
圖4-23 Video quality comparison between Aruba and Ruckus(machine) 30
圖4-24 200Mbps Received total packet comparison(machine) 30
圖4-25 Video quality comparison between Aruba and Ruckus(machine) 31
圖4-26 250Mbps Received total packet comparison(machine) 32
圖4-27 Video quality comparison between Aruba and Ruckus(machine) 33
圖4-28 300Mbps Received total packet comparison(machine) 33
圖4-29 Video quality comparison between Aruba and Ruckus(machine) 35
圖4-30 350Mbps Received total packet comparison(machine) 35
圖4-31 Received total packet comparison (AP) 36
圖4-32 Video quality comparison between Aruba and Ruckus (AP) 36
圖4-33 Video quality comparison between Aruba and Ruckus (AP) 36

參考文獻
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