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This paper presents the design procedure of the NS-3 script for WLAN that isorganized according to the hierarchical manner of TCP/IP model. We configureall layers by using NS-3 model objects and set and modify the values used byobjects to investigate the effects of MAC parameters (access mechanism, CWmin,CWmax and retry limit) on the performance metrics viz. packet delivery ratio,packet lost ratio, aggregated throughput, and average delay. The simulationresults show that RTS/CTS access mechanism outperforms basic access mechanismin saturated state, whereas the MAC parameters have no significant impact onnetwork performance in non-saturated state. A higher value of CWmin improvesthe aggregated throughput in expense of average delay. The tradeoffrelationships among the performance metrics are also observed in results forthe optimal values of MAC parameters. Our design procedure represents a goodguideline for new NS-3 users to design and modify script and results greatlybenefit the network design and management.

Effects of MAC Parameters on the Performance of IEEE 802.11 DCF in NS-3