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IEEE 802.11ac standard provides an increase in performance by introducing the pioneering downlink multi-user MIMO technique which allows simultaneous transmission to multiple clients in the down-link direction [1]. In this paper we have evaluated MU-TXOP sharing probabilities in IEEE 802.11ac at different traffic intensities using analytical model based on discrete Markov chain and E-limited M/G/1...
This issue is the second part of the Special Issue on Networking for Big Data. The first part, with eight article, was published in the July/August 2014 issue of IEEE Network. Since then, we have witnessed fast development in various aspects of big data, such as theories, applications, and platforms.
The paper describes a simple channel scan protocol through which a station can quickly discover and join an existing piconet following a specified channel-hopping MAC protocol piconet in its vicinity. The proposed MAC protocol is simple and does not need a dedicated control channel. Moreover, the cognitive piconet can operate normally throughout the search, unlike Bluetooth where piconet operation...
In this paper, we investigate the IEEE 802.11p based Vehicular Ad-hoc Network transition between non-saturation and saturation regimes with mobile nodes. We combine vehicular traffic theory, queuing model and Markov chain to evaluate the performance of the network under spatial or networking saturation for mutiple data classes over control and service channels with different transmission rates depending...
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