Research On AP Dense Deployment Of WLAN Based On SDN

With the rapid development of mobile Internet technology and the gradual popularization of wireless terminal equipment,the demand for wireless mobile data services is explosive rapid growth.WLAN network has been deployed a large number,the number of wireless access points(AP)and the number of users increased dramatically,the network presents a trend of intensive.On one hand,the intensive deployment of AP can effectively improve the network coverage and system capacity,but on the other hand,the network interference in WLAN is more prominent because of the randomness of AP deployment,which has a serious impact on the overall performance of the network.At the same time,the proliferation of wireless local area network(WLAN)users and the rapid expansion of network density have promoted the development of WLAN from the original sparse traditional autonomous architecture to large-scale centralized.However,the traditional wireless LAN architecture can not meet the development needs of WLAN——fat AP architecture can not achieve centralized control,while the fit AP+AC architecture is poorly programmable due to the development of new applications closed to the AC internal.Therefore,in order to better solve the problem of AP dense deployment in WLAN,it is necessary to develop an AP architecture which can control the underlying AP and have flexible programmability,and deploy feasible and effective wireless resource optimization scheme on this basis.SDN is a new network architecture proposed by the Stanford University in the United States.It breaks the traditional limitations of network,separates the data plane and control plane and presents the open and flexible programmable controller interface,which achieves centralized control of the network and gives the system a high degree of programmability.This paper introduces the SDN architecture into the wireless LAN,making full use of the advantages of centralized control and programmability of SDN to make up for the shortcomings of the traditional architecture,and clarify the specific structure and function of the SDN three layer structure in the wireless LAN.From the two aspects of channel allocation and power control,this paper designs a network optimization scheme.Aiming at the problem of channel allocation,the dense deployment of WLAN scene is modeled,and a heuristic channel allocation algorithm based on greedy algorithm is proposed.Aiming at the power control problem,a power control algorithm based on interference matrix is proposed,which can lock the AP nodes fast and carry out power control reasonally,optimizing the network performance.