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Distributed Queuing Collision Avoidance (DQCA) is a distributed MAC protocol for WLAN systems that offers near optimum performance. The protocol implements a reservation scheme that ensures collision-free data transmissions for high traffic load and switches smoothly and automatically to a random access mechanism when the traffic load is light, improving the delay performance for this situation. In this paper, the DQCA protocol operation is thoroughly described and its algorithm rules are given. Furthermore, an enhanced cross-layer scheduling mechanism is also proposed to be included into the protocol procedure. This mechanism employs a Virtual Priority Function to reschedule transmissions according to a cross-layer design.
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