頁籤選單縮合
題名 | A Novel Mechanism of the Transmission Mechanism in IEEE 802.11=在IEEE 802.11上傳送機制之研究 |
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作 者 | 朱國志; 張碩佑; 鍾昆錚; 李維聰; | 書刊名 | 龍華科技大學學報 |
卷期 | 19 民94.09 |
頁次 | 頁65-74 |
分類號 | 448.6 |
關鍵詞 | 多傳輸速率; 後退時間時槽; IEEE 802.11; CSMA/CA; Multiple transmission rates; Backoff time slot; |
語文 | 英文(English) |
中文摘要 | IEEE 802.11無線區域網路採用了CSMA/CA來做為傳輸的機制,在實體層也支援多種傳輸的速率。使用者端根據與無線網路存取點之間不同的信號品質,會選擇使用不同的傳輸速率。在這篇論文中我們將修改CSMA/CA的機制,使得傳輸速率較快的使用者在傳送時,只需要等待較短的等待時間;而傳輸速率較慢的使用者則等待較長的時間,如此將可以使得網路上可以傳遞更多的資料。最後藉由NS-2軟體的模擬,我們驗證我們的方法的確可以比原始方法在網路產出量上有更好的效能。 |
英文摘要 | IEEE 802.11 Wireless Local Area Network (WLAN) Medium Access Control (MAC) layer provides a fair access protocol to the shared wireless medium based on Collision Sense Multiple Access with Collision Avoidance (CSMA/CA). IEEE 802.11 physical layers (PHYs) support multiple transmission rates. The transmission rate should be chosen in an adaptive manner since the wireless channel condition. If the stations refer to access point (AP) with a low data rate, data packets may be delivered slower than high data rate stations. This will reduce the usage of bandwidth and system performance in the wireless environment. In this paper, a mechanism was proposed to assign the backoff time slot dynamically. And, we verified our mechanism by using network simulator version 2 (NS-2). The performance of our mechanism was also compared with the conventional mechanisms. It was observed that the proposed mechanism performs better throughput than the conventional mechanism. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。