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Robson Costa,Jim Lau,Paulo Portugal,Francisco Vasques,Ricardo Moraes 한국통신학회 2019 Journal of communications and networks Vol.21 No.3
In this paper, the RT-WiFi architecture is proposedto handle real-time (RT) communication in infrastructured IEEE802.11 networks operating in high density industrial environments. This architecture is composed of a time division multiple access(TDMA)-based coordination layer that schedules the medium accessof RT traffic flows, and an underlying traffic separation mechanismthat is able do handle the coexistence of RT and non-RT trafficsources in the same communication environment. The simulationassessment considers an overlapping basic service set (OBSS),where a set of RT and non-RT stations share the same frequencyband. The performance assessment compares the behaviour of theRT-WiFi architecture vs. the behaviour of standard distributedcoordination function (DCF), point coordination function (PCF),enhanced distributed channel access (EDCA), and hybrid coordinationfunction (HCF) controlled channel access (HCCA) mediumaccess control mechanisms. A realistic error-prone model has beenused to measure the impact of message losses in the RT-WiFi architecture. It is shown that the proposed RT-WiFi architecture offersa significantly enhanced behaviour when compared with the useof IEEE 802.11 standard mechanisms, in what concerns averagedeadline misses and average access delays. Moreover, it also offersan almost constant access delay, which is a relevant characteristicwhen supporting RT applications.
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