(4) Give a fuzzy adaptive PID network congestion control method based on fuzzy forecasting. This method is applying fuzzy inferencing method to adjust PID controller parameter adaptively based on fuzzy forecasting results, and accomplish
(2) Analyze network system model, from the point of data transferring, take down the network system to individual sub-object according to the situation of network facilities, modify network mathematics analyzing model through setting up sub-object model. It shows the validity and reliability of this method through emulating and analysis.
Finally, designs of changing contention window length and introducing sleep mechanism were proposed based on analysis of channel joining mechanism in beacon-enabled star topology, furthermore the models of node and channel were given, then the performance of improved network was simulated and presented, and it was concluded that energy was saved while throughput was not lowered by introducing sleep mechanism and reducing contention window length in such networks.