Abstract:

The extended IEEE 802.11 model in NS2 (network simulator version 2) is described, which has the key features of the structured design of functionality modules, cumulative signal to interference plus noise ratio computation, media access control frame capture capabilities, multiple modulation scheme support, packet drop tracing, and Nakagami fading model. Although the extended IEEE 802.11 model supports multi-rate at physical layer, it does not implement the channel adaptive multi-rate selection mechanism. After analyzing the signal flow of the extended IEEE 802.11 model, the mechanism is implemented. The simulation results demonstrate the link throughput improves 4.7 times and packet delay decreases 88% after implementing the channel adaptive multi-rate selection mechanism.