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In the past decades, cooperative communications schemes have gained  significant attention in wireless networks. The cooperative scheme leads to  longer transmission time which can considerably degrade the system  performance. We evaluate the saturation throughput and saturation delay of  the Markov chain model with direct/cooperative schemes to support QoS in  WLANs. Simulation results show that differentiating the contention window  size is better than differentiating the arbitration interframe space in  terms of throughput and delay.

The performance analysis of direct/cooperative transmission to support QoS in WLANs