系統識別號 U0026-2208201813591600
論文名稱(中文) 改善IEEE 802.11ax交疊基本服務集的服務質量機制
論文名稱(英文) Improving QoS Mechanisms for IEEE 802.11ax with Overlapping Basic Service Sets
校院名稱 成功大學
系所名稱(中) 電腦與通信工程研究所
系所名稱(英) Institute of Computer & Communication
學年度 106
學期 2
出版年 107
研究生(中文) 林廷彥
研究生(英文) Ting-Yen Lin
學號 Q36041151
學位類別 碩士
語文別 中文
論文頁數 57頁
口試委員 指導教授-蘇淑茵
中文關鍵字 交疊基本服務集  多使用者多輸入多輸出  服務質量 
英文關鍵字 OBSS  MU-MIMO  QoS 
中文摘要 隨著無線行動裝置日益漸多,使用者對於無線傳輸的需求也隨之增加,有越來越多的Wi-Fi存取點被建置在環境中以服務這些工作站,當存取點之間的距離過於靠近,便會產生多基本服務集之間服務範圍的交疊區域(Overlapping Area),若工作站位於該區域中,將會因為接收到其他基本服務集的存取點訊號被干擾,而導致即時性的資料無法在時間內傳輸,無法保證使用者的服務質量。因此,我們提出了三個策略來改善這個交疊基本服務集(OBSS)問題,對於低服務質量的工作站(LQ-STA),我們將額外給予其在單使用者傳輸中更長的傳輸機會(TXOP),增加其佇列中資料被傳送的機會,並考慮到802.11ax由存取點觸發的多使用者多輸入多輸出(MU-MIMO)傳輸,我們也提高其被存取點選擇的機率,減少等待通道存取的時間;最後以控制器(Controller)調整造成干擾的存取點的傳輸功率,減少低服務質量的工作站傳輸時受到的干擾,透過控制器蒐集環境中所有工作站的交疊區域記錄(OAR),控制器可以解此知道造成干擾的存取點。藉由我們方法中的3個策略,可以改善工作站因交疊基本服務集降低服務質量的問題,回復LQ-STA的服務質量。
英文摘要 IEEE 802.11e defines a set of Quality of Service (QoS) enhancement for Media Access Control (MAC) protocol in legacy 802.11 to satisfy the requirements for data with high instantaneity. And to react to the demand and issues of the growth of the quantity wireless devices, the latest standard IEEE 802.11ax draft has been published since 2014, supporting the Uplink/Downlink (UL/DL) MU-MIMO transmission. In this paper, we consider the condition that QoS-enabled Stations (QSTAs) in Overlapped Basic Service Set (OBSS) WLAN will be interfered seriously owing to receiving the signal from the Access Points (APs) of other BSSs, which increases packet transmission delay time and lower their QoS. Therefore, we propose a multi-BSS system model with our method implied. First, we let those low QoS Stations (LQ-STAs) suffered by OBSS problem have longer TXOP so that the packets in the queue are more likely to transmit. Besides, we deploy a controller in the system to collect and maintain the Overlapping Area Record (OAR) of all STAs. It will inform the APs interfering those LQ-STAs to reduce the transmitting power by looking up the OAR. By our method, LQ-STAs in overlapping area of BSSs can regain the proper QoS.
論文目次 內容目錄 ...................... x
表格目錄 ...................... xi
圖示目錄 ...................... xii
章節 1 介紹 .................. 1
章節 2 背景與相關研究 ........ 7
章節 3 系統模組 .............. 15
3.1 系統環境與傳輸行為 ....... 16
3.2 通道訊號模組 ............. 25
章節 4 提出方法 .............. 30
4.1 判定LQ-STA ............... 31
4.2 收集OAR .................. 33
4.3 提出的方法 ............... 36
章節 5 系統模擬與分析 ........ 39
5.1 模擬環境和參數 ........... 40
5.2 模擬結果與分析 ........... 45
章節 6 結論 .................. 55
參考文獻 ...................... A

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