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Robust traffic differentiation with intra-AC prioritization in multirate IEEE 802.11aa networks

QoS provisioning for Audio-Video traffic in WLANs respecting different priorities was one of the reasons for introduction of the intra-AC prioritization service in the IEEE 802.11aa amendment. However, observations show that as the service is realized by each node independently, with worsening of transmission conditions both types of Video traffic are corrupted. To overcome this issue, basing on two versions of newly proposed shaping algorithm SWCBSA/SWCBSA-P, a novel credit-based scheduler - RWCBSA - is introduced and used to achieve robust traffic prioritization. The solutions are confronted with legacy EDCA behavior in simulation analysis with consideration of variable environment conditions.