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

TL;DR

This paper investigates how MAC parameters affect IEEE 802.11 DCF performance in NS-3 simulations, providing guidelines for optimizing network performance based on simulation results.

Contribution

It offers a systematic design procedure for NS-3 WLAN scripts and analyzes the impact of MAC parameters on various performance metrics.

Findings

RTS/CTS outperforms basic access in saturated conditions

Higher CWmin improves throughput at the cost of delay

MAC parameters have minimal effect in non-saturated states

Abstract

This paper presents the design procedure of the NS-3 script for WLAN that is organized according to the hierarchical manner of TCP/IP model. We configure all layers by using NS-3 model objects and set and modify the values used by objects 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 simulation results show that RTS/CTS access mechanism outperforms basic access mechanism in saturated state, whereas the MAC parameters have no significant impact on network performance in non-saturated state. A higher value of CWmin improves the aggregated throughput in expense of average delay. The tradeoff relationships among the performance metrics are also observed in results for the optimal values of MAC parameters. Our design procedure represents a good guideline for new NS-3 users to design and modify script and results greatly benefit the network design and management.