Abordagem de atribuição de canais baseada em múltiplos fatores para redes locais sem fio

Abstract

With the significant utilization of the Wi-Fi networks as one of the main mass media and transmission of data, some problems of traffic reliability have been related and increasing day by day. The unplanned use of Access’ Points – AP, chained to the interferences resulting from coexistence of other technologies occupying the same frequency spectrum 2.4GHz, has constantly affected the performance of these networks. In order to propose a solution to interference’s problem between networks 802.11, this work describe an approach of attribution of channels based in many aspects such as received signal strength indicator, signal-to-noise ratio, link quality and channels overlap factor. This approach, named MFDCA (Multi-Factor Dynamic Channel Assignment) is composed by detection interferences modules, as well as selection and attribution of channels. The approach attributes in a dynamic way operation of channels in the networks 802.11, considering the characteristics noted in the spectral environment where which AP is inserted. The MFDCA was developed so that to operate in low cost of access points, as long as they withstand an installation of a firmware based in Linux. The results of the tests accomplished in a pilot network show that a MFDCA is able to benefit the network as a whole, including non-administered networks, by increasing its throughput and decreasing the rate losses of packages.