| Summary: | 碩士 === 國立成功大學 === 工程科學系專班 === 97 === In the current wireless network environment, IEEE 802.11b communication protocol in MAC layer has two kinds of transmission methods under environment of Multi-rate and Single-rate. To ensure the unobstructed communication between stations and base stations that avoidance the packet loss in transmission. The mechanisms of CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance), RTS/CTS (Request To Send / Clear To Send) are used to reduce the opportunities of package collision during the transmission. However, the usage of RTS/CTS results in the long delay time and low transmission flow between stations. In this paper, we first analyze and compare several vital factors which influence the performance of RTS threshold under the wireless network transmission. Next, we demonstration RTS/CTS launch timing, which is obtained from the cross analysis under Single-rate and Multi-rate transmission. Finally, we propose a rule-based mechanism to improvement the transmission throughput at Single-rate transmission disabled RTS/CTS and Multi-rate transmission enabled RTS/CTS, through extensive experiments, the results that prove our scheme can improve the performance actually.
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