Efeito dos mecanismos de QoS nas redes em malha sem fios com restrições de energia
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A rede em malha sem fios (WMN) � um conjunto de n�s sem fios que podem comunicar dinamicamente entre si atrav�s de m�ltiplos saltos. A WMN tem recebido consider�vel aten��o como meio de conectividade em comunidades e entidades comerciais. A facilidade de implementa��o e as caracter�sticas de autogest�o das WMN tornam-nas uma boa op��o para �reas rurais. No entanto, na maioria dos pa�ses em desenvolvimento, a eletricidade � escassa ou pouco fi�vel nas �reas rurais. Uma solu��o poss�vel para a falta de fornecimento de eletricidade nessas �reas � a utiliza��o de n�s alimentados a energia solar ou a bateria. Foram envidados esfor�os significativos na otimiza��o do fornecimento de QoS nas WMN; por isso, foram propostos muitos mecanismos de QoS na camada OSI. No entanto, n�o � claro como os diferentes mecanismos de QoS na camada OSI afetam a vida �til do n� e o custo energ�tico por bit. Protocolos diferentes em camadas diferentes t�m efeitos vari�veis na efici�ncia energ�tica dos n�s WMN alimentados por bateria, quando esses protocolos est�o sujeitos a v�rios n�veis de pot�ncia de transmiss�o e tamanhos de carga �til. O objetivo deste estudo � avaliar como os diferentes mecanismos de QoS existentes afetam a vida �til operacional dos n�s WMN alimentados por bateria.
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