Research On The802.11Network Highly Dense Deployment Of Access Algorithm

With the rapid development of network, the traditional wired network cannot make the people satisfied in the modern world. They want to get rid of the cable. The wireless network which came from the wired network plays a more important role in our lives nowadays. In recent years, wireless network develops rapidly and the wireless terminal gradually diversifies. More and more devices, such as mobile phone, notebook computer, sports bracelet and so on, accessing to the wireless network brings dense deployment problems. In the dense deployment scenario, the users’ terminal how to access network effectively is an inevitable question. Therefore, it has a very important theoretical and practical application of the value of the research.This paper does some research on wireless network in dense deployment scenarios of the problem. Through the practical application of the scene investigation, it summarizes the similarities and features of application scenarios.Then two basic models have been established by the work before. Then we do some scene simulation for the two basic models.After that,we analysis the simulation results and make a conclusion that under dense deployment scenarios will lead to decline in the quality of services in WLAN. By using the single variable method, compare the impact of each variable on the network.we figure out that traffic from overlapping area and AP overloaded node are major factor leading quality of service becoming worse. Subsequently, the paper based on the analysis of these issues, we propose a central management admission control algorithm. We set a central node in wireless network, all the other AP nodes connected to the central node. Each AP regularly reports the relevant parameters to the central node. The central node collects traffic information from each basic service set and aggregated the information. Then the network makes the decision whether to allow new traffic to connect to the network by concerning about load capacity of each basic service set of AP. Thus by controlling the flows of the network ensure that the current QoS of network. The ultimate goal of the algorithm is to make wireless networks maintaining a relatively high throughput while ensuring network quality of service.Furthermore, in order to give each terminal fair opportunities access to the network.we presented in this article modification cell breathing algorithm-distance control cell breathing. The cell breathing method is complementary to the central management admission control algorithm. The unfairness which access algorithm leads to exceeding the threshold will trigger cell breathing algorithm. In order to ensure the fairness of the network, this paper’s cell breathing algorithm to dynamically adjust the coverage of AP nodes.It will force some of the terminal node do the AP switching operation. So that some node which had been denied before will have the opportunity to join the neighboring nodes basic service set. Meanwhile, the algorithm can also control the number of nodes in the overlapping region, reduces co-channel interference between basic service sets. It will make the throughput and quality of service of the network to achieve optimal.Some simulations have been done about the proposed algorithms and programs based on NS2network simulation platform. The simulation results demonstrate the effectiveness and feasibility of the proposed algorithm.