Abstract
Improving the quality of service (QoS) performance to support existing and upcoming real-time applications is critical for IEEE 802.11n/ac devices. The mechanisms of the media access control (MAC) layer, including the aggregate MAC protocol data unit (A-MPDU) aggregation, greatly affect the QoS performance in wireless local area networks (WLANs). To investigate the impact of the aggregation level on the QoS performance for real-time multimedia applications, a novel end-to-end delay model for the unsaturated settings is proposed in this paper. The presented model considers the gathering procedure of packets, queuing behaviors, and transmissions using the RTS/CTS (request to send/clear to send) mechanism on error-prone channels. Based on the model, a novel QoS-aware A-MPDU aggregation scheduler for IEEE802.11n/ac WLANs was shown to obtain better QoS performance with lower latency and less packet loss, a larger capacity to hold higher data rates, and more working nodes. The validation of the proposed model and the promotion of the proposed scheduler are well benchmarked by ns-3.
Highlights
IEEE 802.11n/ac wireless local area networks (WLANs) are widely used to bear Internet traffic for real-time multimedia applications, such as live video sharing, voice over internet protocol (IP), and online games on electronic devices
According to [1], the average end-to-end delay should be less than 100 ms, and the packet loss rate should be less than 0.1% for real-time applications
In IEEE 802.11n/ac WLANs, the performance of the media access control (MAC) layer is enhanced via the aggregate MAC protocol data unit (A-MPDU) aggregation and block acknowledgment (BlockACK) [2]
Summary
IEEE 802.11n/ac wireless local area networks (WLANs) are widely used to bear Internet traffic for real-time multimedia applications, such as live video sharing, voice over internet protocol (IP), and online games on electronic devices. These real-time multimedia applications necessitate a stringent level of quality of service (QoS) performance, including low end-to-end delay and small packet loss rates. To investigate the performance of real-time multimedia applications in IEEE802.11n/ac WLANs with A-MPDU aggregation, we proposed a novel end-to-end delay model. Based on the proposed model, we present a novel QoS-aware A-MPDU aggregation scheduler for IEEE802.11n/ac.
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