In this paper, the possible effects of the problem of congestion in Wireless infrastructure LAN are discussed. It presents the discrete-event simulation, provides detailed, accurate network simulation results and it observed a wide variety of network statistics for Congestion Control in Wireless LAN. The software simulation package, OPNET (Optimized Network Engineering Tool), can be best described as a set of decision support tools, providing a comprehensive development environment for the specification, simulation and performance analysis of communication networks, computer systems and applications and distributed systems. Discrete event simulations are used as the means of analyzing the system performance and behavior. OPNET simulations were carried out to estimate the effect of congestion situation on the global performance of the network model. A tradeoff of various congestion parameters such as dropped data, load, throughput, retransmission attempts and received data traffic has been observed by creating different scenarios. Simulations are carried out at 11Mbps data rate is 900 simulations-seconds. There are six sections in this paper, section I deal with the introduction to the wireless LAN and the causes behind the occurrence of Congestion in general, section II deal with the problem of Congestion in Wireless environment, section III deal with the suggestions regarding the possible solution to the problem of congestion, section IV and V are to deal with the simulation and results and at last the paper is concluded by summarizing the important results.