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In this paper, the authors study the problem of how to design a medical-grade wireless LAN for healthcare facilities. Unlike IEEE 802.11e MAC, which categorizes traffic primarily by delay constraint, the authors prioritize medical applications into access categories according to medical criticality. They design a fully-distributed contention control mechanism that can efficiently utilize wireless channel for improving medical-grade QoS. The authors further derive a sufficient condition for the convergence of the proposed algorithm. Their simulation result shows that their medical access categorization and the contention control mechanism significantly improve the performance of a medical network over the conventional IEEE 802.11e MAC.
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