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Audio-video streaming in Wi-Fi (IEEE 802.11) wireless local area networks (WLANs) has recently attracted a lot of attention. In order to increase the granularity of traffic prioritization and quality of service (QoS) support defined by EDCA, intra-access category prioritization has recently been introduced in the IEEE 802.11aa amendment. In this paper, we present novel results which show how the new mechanism impacts the performance of an access point (AP). Additionally, we propose a wireless credit-based shaper algorithm (WCBSA), a version of CBSA adjusted to the wireless environment. We also analyze how the different settings of WCBSA impact the prioritization of traffic streams. Finally, we compare the operation of 802.11aa intra-access category prioritization with the legacy inter-access category prioritization defined by EDCA.

Ensuring QoS guarantees for real-time multimedia traffic in WLANs has recently attracted a lot of attention from standardization bodies and researchers. In order to increase the granularity of traffic prioritization and QoS support provided by EDCA, the intra-access category prioritization mechanism has been proposed in the recent IEEE 802.11aa amendment. In order to improve real time transmission over WLANs, two standard transmission selection algorithms can be used to prioritize traffic within the voice and video access categories of EDCA: the strict priority algorithm and the credit-based shaper algorithm (CBSA). This paper focuses on the improvement of video transmission over WLANs using two video transmission queues (primary and alternate) and the two traffic selection algorithms and compares the behavior of IEEE 802.11aa with legacy EDCA. Additionally, it comments on the possible ways of CBSA implementations. Finally, it proposes an adjustment of CBSA to wireless environment (WCBSA) which gives the most promising results.

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