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Acesso multiusuário em WLANs de alta eficiência by Saloua Brahmi

Acesso multiusuário em WLANs de alta eficiência

by Saloua Brahmi , Mohand Yazid
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Book cover type: Paperback
  • ISBN13: 9786206817581
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Edicoes Nosso Conhecimento
  • Publisher Imprint: Edicoes Nosso Conhecimento
  • Publication Date:
  • Pages: 88
  • Original Price: GBP 52.98
  • Language: Portuguese
  • Edition: N/A
  • Item Weight: 127 grams
  • BISAC Subject(s): Networking / General

Para promover as comunica��es MU (Multi-Utilizador) em WLANs de elevada efici�ncia, a nova norma IEEE 802.11ax introduziu o conceito de RU (Resource Unit) atrav�s da t�cnica de transmiss�o OFDMA. Embora as comunica��es OFDMA MU permitam servir v�rios utilizadores ao mesmo tempo nas direc��es DL (Down-Link) e UL (Up-Link), h� ainda v�rios desafios a enfrentar para conceber um protocolo MAC (Medium Access Control) que atribua de forma justa e utilize eficazmente as RUs. Os desafios a enfrentar s�o os seguintes (1) definir quando e como utilizar os quadros de controle 802.11ax, (2) estabelecer uma pol�tica de envio justo das necessidades UL, (3) adotar uma estrat�gia para selecionar uma estrutura de canal, e (4) evitar perda de efici�ncia espetral e timeout BA (Block Acknowledgment). Nesta tese, propusemos o protocolo FAEU-RUs (Fair Allocation and Effective Utilization of RUs), respondendo a cada um dos desafios das comunica��es OFMDA MU. A avalia��o de desempenho demonstra que o protocolo FAEU-RUs melhora significativamente o desempenho global da rede, mas tamb�m o desempenho individual de cada tipo de tr�fego (DL e UL) e de cada categoria de esta��o.

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