Performance Comparisons of Collision Resolution Mechanism in IEEE 802.11 Using Network Simulator NS-2

• Main Authors: Shuo-Yu Chang, 張碩佑
• Other Authors: Wei-Tsong Lee
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/91652872061794423773

碩士 === 逢甲大學 === 資訊工程所 === 92 === 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). It is a contention-based mechanism to access the medium. 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. A mechanism was proposed to assign the backoff time slot dynamically. In this thesis, we evaluated the mechanism by using network simulator version 2 (NS-2). The performance of the new mechanism was compared with the conventional mechanism. It was observed that the proposed mechanism performs better throughput than the original mechanism.