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| 研究生： |
李顯成 Hsien-cheng Li |
|---|---|
| 論文名稱： |
無線區域網路多通道直接連結演算法 WLAN Multi-Channel Direct Link Algorithm |
| 指導教授： |
陳漢宗
Hann-Tzong Chern |
| 口試委員: |
吳乾彌
Chen-Mie Wu 趙耀庚 Yaw-Geng Chau |
| 學位類別： |
碩士 Master |
| 系所名稱： |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
| 論文出版年： | 2007 |
| 畢業學年度： | 96 |
| 語文別： | 中文 |
| 論文頁數： | 64 |
| 中文關鍵詞： | 優級連線 、次級連線 、整體網路輸出值 、多通道直接連結演算法 、非重疊通道 、端點對端點延遲時間 |
| 外文關鍵詞： | good link, bad link, throughput, MDLA, non-overlapping channel, end-to-end delay |
| 相關次數： | 點閱：228 下載：1 |
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IEEE 802.11 DCF通訊協定應用在多速率（Multi-rate）WLAN 連線環境下，所有移動節點(Mobile Node，簡稱MN)使用相同參數競爭無線通道使用權。由於CSMA/CA並未針對連線時間進行管制，因此次級連線(data rate <= 2Mbps)佔用大部份連線時間，而造成優級連線(data rate >= 5.5Mbps)無法取得足夠無線通道資源進行資料傳送，導致整體網路輸出(network throughput)表現不佳及端點對端點延遲(end-to-end delay)時間上升。
本論文研究提出多通道直接連結演算法(Multi-Channel Direct Link Algorithm，簡稱MDLA)，允許移動節點在主從式無線區域網路(infrastructure network)連線模式下，使用其它的非重疊通道(non-overlapping channel)，建立短距離點對點(peer to peer)連線，來降低次級連線數量及提高優級連線時間，而改善整體網路輸出值，並降低端點對端點延遲時間。
IEEE 802.11 DCF protocol does not work efficiently in the multi-rate wireless local area networks (WLAN) and leads to the unfairness of the channel access. Since the good links have higher data rate, it should have more opportunities to send than the bad ones. The IEEE 802.11 DCF protocol will make the network throughput decreased and the end-to-end delay increased.
In this paper, we present the Multi-Channel Direct Link Algorithm (MDLA), which works in the WLAN infrastructure network. A direct link will be set up between talking nodes over some other non-overlapping channel. Therefore, the good links get much more time to send and the bad ones get less. Hence, both the throughput and end-to-end delay of the network are improved.
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