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Um protocolo MAC para redes de sensores sem fios multicanal

Um protocolo MAC para redes de sensores sem fios multicanal

Carlene Campbell / Kok-Keong Jonathan Loo

53,67 €
IVA incluido
Disponible
Editorial:
KS OmniScriptum Publishing
Año de edición:
2024
Materia
Tecnología: cuestiones generales
ISBN:
9786208098636
53,67 €
IVA incluido
Disponible

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Este livro apresenta o multicanal com rádio único como um novo paradigma para a função coordenada distribuída (DCF) IEEE 802.11 em redes de sensores sem fios (RSSF). Tradicionalmente, as RSSF não necessitavam de uma taxa de dados e de um débito elevados. Com a mudança de tecnologia, o fluxo de multimédia, a mobilidade dos nós sensores e o tráfego de veículos tornaram-se a tendência para a recolha de dados sensoriais, pelo que é necessário um protocolo de taxa de dados elevada para as RSSF. Este livro centrou-se na conceção de um algoritmo que aplicasse o multicanal ao algoritmo DCF back-off do IEEE 802.11 para reduzir o tempo de espera de um nó e aumentar o débito ao tentar aceder ao meio. Em primeiro lugar, foram estudadas as subcamadas MAC dos protocolos IEEE 802.15.4 e IEEE 802.11 MAC para ajudar a compreender o esquema CSMA/CA dos protocolos 802.11 e 802.15.4. O desempenho de ambos foi investigado e avaliado através de resultados de simulação. Em segundo lugar, foi examinado o algoritmo de backoff MC-DCF proposto para acesso multicanal baseado nos protocolos 802.11 DCF. Este algoritmo permite que o nó tenha acesso a múltiplos canais não sobrepostos, acedendo a canais dinamicamente através da comutação de canais após ter sido atingido um determinado limiar.

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