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We analyze the MAC performance of the IEEE 802.15.4 non-beacon mode where both uplink and downlink traffic flows are executed simultaneously and downlink data packets are transmitted by piggyback method. To build the mathematical model of the stochastic behavior of a device with both uplink and downlink traffic flows, we combine the Markov chain model for the uplink transmission in T.O. Kim et al...
We consider IEEE 802.11s multi-hop wireless mesh network under multi-channel and multi-radio environments. We decompose the mesh network into disjoint zones by using multiple channels and multiple radios such a way that (i)mesh nodes in a zone are within one-hop distance and compete with other nodes to access the channel using IEEE 802.11e EDCA, (ii) neighbor zones use different channels, (iii) each...
We provide a simple mathematical model of IEEE 802.15.4 unslotted CSMA/CA by busy cycle of M/G/l queueing system to obtain several performance measures. Our performance measures can be used for determining the optimal number of devices while supporting the required QoS constraints on the average packet delay and the packet loss probability, and also for calculating battery lifetime.
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