Performance Comparison of Link Layer Protocol Using IEEE 802.11 in Network Simulator-2

the project entitled “Performance comparison of link layer protocol in IEEE 802.11� is a performance enhancement mechanism. The main objective of this mechanism is to improve the overall efficiency and data packet delivery in wireless LANs. IEEE 802.11 Wireless Local Area Network Medium Access Control layer provides a fair access protocol to the shared wireless medium based on Carrier Sense Multiple Access with Collision Avoidance. It is a contention based mechanism to access the medium. IEEE 802.11 physical layers 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 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 back off time slot dynamically. We have evaluated the mechanism by using network simulator version2.