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The Distributed Queuing with Collision Avoidance (DQCA) Medium Access Control (MAC) protocol has been presented in the literature as a high-performance protocol for up-link traffic in WLANs. Previous works regarding DQCA are focused on the operation of a single cell, where no interaction with neighboring sites is considered. In this paper, the authors define specific hand-off functions (channel sensing, discovery and re-association functions) that enable the roaming of users in a scenario composed by a number of different DQCA access points deployed in a specific area using different channel frequencies.
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