IEEE 802.15.4 CSMA/CA Scheme for Heterogeneous Sensor Networks Based Adaption and RTS/CTS Mechanism

摘要

Recently, the wireless sensor networks (WSNs) are being widely used in various fields which can simultaneously support many kinds of sensing tasks in a common sensor field. In heterogeneous sensor networks (HSNs), the network topology may change due to environmental factors or energy depletion, the position of the moving object and the observer, adding a new node; each node generates data packets with a different size, degrading the network performance. In this paper, we propose a multi-channel three-dimensional probability CSMA/CA scheme based on the adaption and RTS/CTS mechanism, which is a variation on the basis of IEEE 802.15.4 CSMA/CA, solving the three problems. The mathematical model based on the discrete time is presented and analyzed to measure the performance. Network aggregate throughput and multiple priorities throughput with diverse business are successfully detected. Simulation results are given to verify the accuracy of the improved model.