WLAN 802.11 anomaly mitigation using SNR to control backoff contention window / Minimização do efeito de anomalia em redes IEEE 802.11 usando SNR para controlar o CW

AUTOR(ES)

Debora Meyhofer Ferreira

DATA DE PUBLICAÇÃO

2007

RESUMO

Ethernet exists more than 20 years and the wireless Ethernet, known as IEEE 802.11, for more than seven years. Extensions of the original standard, as IEEE 802.11g, are been created to guarantee higher transmission rates. However, some conditions there are that affect the performance of the network. One of them, known as Performance Anomaly, occurs when in an infrastructured WLAN stations (STAs) operate at different rates. In such a case, the low rate STA rate captures the channel for a long time, penalizing the higher rate stations, thence degrading the performance of the network. This work substantiates and quantifies such an anomaly and proposes a method to mitigate the effect of it, prioritizating the higher STAs. This mitigation is is carried out using Signal to Noise Ratio as a criterion to control the Contention Window variation. The mechanism is modeled mathematically and evaluated by means of simulation using the software Network Simulator.

ASSUNTO(S)

wlan cw desempenho performance sistemas de comunicação sem fio ieee 802.11

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