Avoiding Collisions by Time Slot Reduction Supporting Voice and Video in 802.11 Networks

One of the main challenges on the next generation local wireless networks lies in providing scalable media access control protocols in order to support the predicted high density. Research results have indicated that the current backoff mechanism is ineffective for dense networks, even more under the foreseen growing charge for the next five years. This paper investigates the proposal of the contention window enlargement, particularly by the reduction of time slot. The proposal intends to be implemented in the the 802.11ax amendment. Our main contribution lies in highlighting the impact of this proposal under different classes of traffic, reflecting on the access categories for data priority and their respective window time. Simulation results indicate that the proposal mitigates collision issues inherent to the backoff procedure, and it decreases frame loss. This study shows improvements over throughput and retransmissions, and it also warns to the impact on the clear channel assessment process. Results contribute with the literature pointing out the advantages and disadvantages of the adaptive proposal considering different classes of traffic and promoting the advance of the next generation local wireless networks.

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