Coexistence of IEEE 802.15.4 with IEEE 802.11b

The recurrent collocation of IEEE 802.15.4 Wireless Sensor Networks (WSNs) and IEEE 802.11b Wireless Local Area Networks (WLANs) consequence in coexistence issues, as these networks share the same 2.4GHz Industrial, Scientific, and Medical (ISM) band. As a result, their performance may degrade. We have proposed a coexistence model of IEEE 802.15.4 and IEEE 802.11b networks, which attend to their coexistence behavior and explain their coexistence performance. The packet error rate (PER) of the IEEE 802.15.4 under the interference of the IEEE 802.11b is taken as a foremost performance measure , and is obtained from the bit error rate (BER). The signal to noise and interference ratio is used to calculate the BER. The minimum distance between IEEE 802.15.4 and IEEE 802.11b is observed from the PER. Throughput, average end-end delay and average jitter is used as performance measures to analyze the performance of IEEE802.15. The methodical results are validated for various topologies with and without mobility model using Qualnet 4.5 simulation.