Study On Optimization Of Deployment And Load Balancing Of Wireless LAN In Aircraft Cabin

With the rapid development of wireless and mobile communications,the demand for Internet services anytime,anywhere is increasing.Aircraft cabins as information islands have also been proposed to achieve mobile communication,and whether to provide airborne mobile communication has become a major factor for passengers to choose airlines.Combining with the needs of China Commercial Aircraft Co.,Ltd.Cooperation project “Development and Testing of Prototype of Air-to-Ground Broadband Data Link Communication System”,the main research content and results are as follows:(1)Due to the tunnel shape of the cabin,the seats and passengers are densely distributed in the cabin.The multi-paths are abundant and the fading occurs during the transmission.Generally,the signal fading can be overcome by increasing the transmit power of the AP,but the deployment of wireless local area network in the aircraft cabin must ensure that mobile signals do not cause interference to the avionics system,and the transmission power needs to be limited below a certain threshold that meets security requirements.Therefore,this thesis adopts the method of deploying multiple APs to divide the wireless local area network into multiple cells,in order to reduce the transmit power of each AP and the impact of signal fading.In this thesis,we determine the two objective functions which are the minimum total AP transmit power and the minimum number of APs deployed.According to the objective function,aiming at the AP overlapping coverage,we establish the mathematical model of AP optimization in cabin and uses the built-in model to solve the model.The numerical simulation results show that the joint optimization algorithm can not only optimize the cabin AP layout according to the user’s distribution law,but also effectively reduce the number of cabin APs.It can be provided a reference for AP deployment of high-density overlapping communication network in aircraft cabin.(2)In WLAN,the terminal of user only uses the received signal strength as the connection standard during the access or roaming process,regardless of the load of the connected AP.In view of the imbalance in the traffic load carried by each AP,some APs have a high load,while the load on adjacent APs is very light or even idle.Considering that in the planning of wireless local area network on an aircraft,the transmit power of the AP is limited by electromagnetic compatibility conditions,we study the problem of WLAN load balancing based on power control.In this thesis,we turn the problem of minimizing congestion load into a problem of finding the network state with minimizing congestion load,and propose a maximum and minimum priority load balancing algorithm.The simulation results show that the algorithm can achieve global load balancing without covering black holes on the premise of ensuring reliable communication for users.