Abordagem de atribui????o de canais baseada em m??ltiplos fatores para redes locais sem fio

Submitted by bruna ortiz (brunaortiz.f@gmail.com) on 2016-07-04T15:34:48Z No. of bitstreams: 1 Disserta????o-Laura Michaella Batista Ribeiro.pdf: 5196443 bytes, checksum: 44f8d0ba69aa5d5fb4454331819feaa4 (MD5) Approved for entry into archive by Divis??o de Documenta????o/BC Biblioteca Central (ddbc@ufam.edu.br) on 2016-07-18T13:11:02Z (GMT) No. of bitstreams: 1 Disserta????o-Laura Michaella Batista Ribeiro.pdf: 5196443 bytes, checksum: 44f8d0ba69aa5d5fb4454331819feaa4 (MD5) Approved for entry into archive by Divis??o de Documenta????o/BC Biblioteca Central (ddbc@ufam.edu.br) on 2016-07-18T13:25:46Z (GMT) No. of bitstreams: 1 Disserta????o-Laura Michaella Batista Ribeiro.pdf: 5196443 bytes, checksum: 44f8d0ba69aa5d5fb4454331819feaa4 (MD5) Made available in DSpace on 2016-07-18T13:25:46Z (GMT). No. of bitstreams: 1 Disserta????o-Laura Michaella Batista Ribeiro.pdf: 5196443 bytes, checksum: 44f8d0ba69aa5d5fb4454331819feaa4 (MD5) Previous issue date: 2014-04-07 CAPES - Coordena????o de Aperfei??oamento de Pessoal de N??vel Superior 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. Com a utiliza????o significativa das redes Wi-Fi como um dos principais meios de comunica????o e transmiss??o de dados, problemas relacionados ?? confiabilidade no tr??fego dessas redes foram surgindo. O uso n??o planejado de pontos de acesso (do ingl??s, Access Point - AP), aliado com as interfer??ncias decorrentes da coexist??ncia de outras tecnologias compartilhando o mesmo espectro de frequ??ncias 2,4GHz, tem constantemente afetado o desempenho das redes sem fio. Com o intuito de propor uma solu????o para o problema de interfer??ncia entre redes sem fio 802.11, este trabalho descreve uma abordagem para atribui????o de canais baseada em m??ltiplos fatores como a indica????o da intensidade do sinal recebido, a rela????o sinal-ru??do, a qualidade de link e o fator de sobreposi????o de canais. Esta abordagem, denominada de MFDCA (Multi-Factor Dynamic Channel Assignment) ?? composta pelos m??dulos de detec????o de interfer??ncias e de sele????o e atribui????o de canais. A abordagem atribui de forma din??mica canais de opera????o nas redes 802.11, considerando as caracter??sticas presentes no ambiente espectral onde cada AP est?? inserido. AMFDCA foi projetada para operar em pontos de acesso de baixo custo, desde que suportem a instala????o de um firmware baseado em Linux. Os resultados dos testes realizados em uma rede piloto mostram que a MFDCA ?? capaz de beneficiar as redes como um todo, incluindo redes n??o administradas, proporcionando um aumento na vaz??o de dados e a diminui????o das taxas de perdas de pacotes.