Modelling and performance analysis of video and voice streams in the IEEE 802.11e-EDCA WLANs with TXOP bursting under fading channel

Abstract

Performance evaluation of the IEEE 802.11e network has been the subject of several research papers. Especially, the transmission opportunity limit (TXOPLimit) has been proven efficient for achieving differentiated quality of service (QoS) and improving the wireless bandwidth utilisation. However, most existing analytical models have been developed under unrealistic assumption that the wireless channel is error-free. Hence, the efficiency and the performance level of the TXOPLimit in an error-prone channel are questionable. In this paper, we aim at proposing a new Markov chain model of the IEEE 802.11e network including the TXOPLimit and the packet error rate (PER). Then, we derive the saturation throughput of the IEEE 802.11e network in cases of aggregated and non-aggregated packets. The obtained results show that, the TXOPLimit efficiency is highly degraded under the effect of bit error rate (BER) and packet length.

MAC improvements for very high throughput WLANs

“…As a result, this particular aggregation scheme is more effective in most of the scenarios than A-MPDU and A-MSDU aggregation operating alone (Perahia and Stacey, 2013). Table 2 shows the default access category configuration of the 802.11e standard using for QoS guarantee which is applicable for every high throughput WLANs (Abusubaih, 2016;Lorchat and Noel, 2006;Yazid et al, 2017).…”

“…Besides, 802.11ac provides for 160 MHz channels to be constructed from non-contiguous 80 MHz channels. This offers an additional 13 combinations of 160 MHz channels (Perahia and Stacey, 2013;Abusubaih, 2016;Lorchat and Noel, 2006;Yazid et al, 2017). 3.4 Enhanced aggregation and PPDU format 802.11n offered aggregation method where various subframes are collected and transmitted to a single frame to better MAC performance.…”

“…When the AP gains control of the channel to transmit the voice frame to the STA3, the AC_VO becomes the primary AC. The AP begins constructing an MU frame and other frames, and other access categories are started to participate in the transmission (Das et al, 2013;Abusubaih, 2016;Lorchat and Noel, 2006;Yazid et al, 2017).…”