Simulation of CSMA

In this study, we implemented a simulation framework for slotted Non-Persistent Carrier Sense Multiple Access (NP-CSMA) protocols. Our model incorporates critical network behaviors including packet collisions, retransmission mechanisms, and channel occupancy states. The simulation architecture employs discrete-event modeling to track node transmission attempts, where each node performs carrier sensing at slot boundaries and implements randomized backoff algorithms upon detecting channel busy conditions. We validated our implementation by comparing simulated throughput and delay metrics against established theoretical curves, demonstrating close alignment under varying traffic loads. Through detailed analysis of experimental data, we identified several noteworthy performance patterns, including throughput degradation under high collision rates and optimal operating points for different retransmission strategies. Our research provides comprehensive insights into NP-CSMA's operational characteristics, highlighting both its advantages in reduced collision probability and limitations in channel utilization efficiency. These findings offer valuable references for future protocol optimization and wireless network design.