Performance Analysis of Downlink MU-TXOP Sharing in IEEE 802.11ac

Ali, M. Zulfiker; Mišić, Jelena

doi:10.1109/tvt.2017.2701351

Cited by 12 publications

(9 citation statements)

References 10 publications

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“…and freezing counter restart probability of STA k (k < l) due to unsuccessful reservation of bandwidth is pf f l = 1 − f l − ps l . However, the backoff counter suppression probability of a STA due to successful or unsuccessful bandwidth reservation during MU-UL transmission remains same as derived in [22]. The PGF for the duration of unsuccessful bandwidth reservation T c k (z) due to collision of multiple primary RTSs or the corruption of G-CTS can be obtained as…”

Section: A Backoff Modelmentioning

confidence: 99%

“…When AP gains access to the medium, downlink MU-MIMO transmission is initiated and when a STA gains access to the medium, an uplink MU-MIMO transmission is initiated. We have evaluated the performance of DL-MU-MIMO in our previous work [22]. In this paper, we restrict our analysis only for the uplink traffic in order to reduce the complexity of our analytical model.…”

Section: Analytical Modelmentioning

confidence: 99%

“…Finally, the PGFs for backoff time for STA k during i backoff phase T bi k,i (z), total backoff time T b k (z) and proactive zeroth backoff time T b0 k (z) can be derived in a similar fashion as discussed in [22]. 4) Impact of Hidden Nodes: In our network we assume that AP is located at the center of the BSS and the transmission range of all the nodes are equal.…”

Section: A Backoff Modelmentioning

confidence: 99%

“…where f mu is the MU transmission probability defined in (7). Now, the successful transmission probability in presence of hidden nodes γ k,h can be evaluated as γ k,h = γ k f ncoll where γ k is the successful transmission probability without hidden node [22].…”

Section: A Backoff Modelmentioning

confidence: 99%

“…The PGF for the number of frames in the queue after the departure of π-th frame can be written as Π k,μ (z) and is obtained from [22].…”

Section: B Queuing Modelmentioning

confidence: 99%

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Uplink Access Protocol in IEEE 802.11ac

Ali

Mišić

2018

IEEE Trans. Wireless Commun.

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The IEEE 802.11ac amendment enhances WLAN throughput by exploiting the spatial diversity of the antennas in a multi-user multi-input multi-output downlink transmission. Still, network resources remain under-utilized in uplink transmission due to single-user communication. In this paper, we propose an access point-controlled MAC protocol (A-MAC) that enables simultaneous transmissions from multiple STAs in uplink. The protocol uses the EDCA channel access technique to initiate multi-user transmission and the OFDMA method to transmit multiple RTSs simultaneously. It also introduces the explicit channel sounding technique by using dedicated OFDM subcarrier blocks for each user. Performance measurement shows that network throughput of the A-MAC is 150% higher than that of a single uplink transmission, thanks to the availability of concurrent multiple RTS transmissions in the uplink. The proposed protocol shortens the backoff time by up to 50% for all traffic categories due to concurrent multiple transmissions and thus enhances the battery life of the nodes. We observe that although the smaller backoff window of high-priority traffic category enhances the network throughput, higher intensity of high-priority traffic drives the network faster to saturation. Furthermore, better network stability and fairness among different traffic categories can be achieved when the dominant traffic has low priority.

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Section: A Backoff Modelmentioning

confidence: 99%

Section: Analytical Modelmentioning

confidence: 99%

Section: A Backoff Modelmentioning

confidence: 99%

Section: A Backoff Modelmentioning

confidence: 99%

“…The PGF for the number of frames in the queue after the departure of π-th frame can be written as Π k,μ (z) and is obtained from [22].…”

Section: B Queuing Modelmentioning

confidence: 99%

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Uplink Access Protocol in IEEE 802.11ac

Ali

Mišić

2018

IEEE Trans. Wireless Commun.

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Throughput Performance Analysis of DL-MU-MIMO for the IEEE 802.11ac Wireless LAN

Farej,

Ali

2023

Advances in Intelligent Systems and Computing

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Impact of IEEE 802.11n/ac PHY/MAC High Throughput Enhancements on Transport and Application Protocols—A Survey

Karmakar

Chattopadhyay

Chakraborty

2017

IEEE Commun. Surv. Tutorials

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Since the inception of Wireless Local Area Networks (WLANs) in the year 1997, it has tremendously grown in the last few years. IEEE 802.11 is popularly known as WLAN. To provide the last mile wireless broadband connectivity to users, IEEE 802.11 is enriched with IEEE 802.11a, IEEE 802.11b and IEEE 802.11g. More recently, IEEE 802.11n, IEEE 802.11ac and IEEE 802.11ad are introduced with enhancements to the physical (PHY) layer and medium access control (MAC) sublayer to provide much higher data rates and thus these amendments are called High Throughput WLANs (HT-WLANs). In IEEE 802.11n, the data rate has increased up to 600 Mbps, whereas IEEE 802.11ac/ad is expected to support a maximum throughput of 1 to 7 Gbps over wireless media. For both standards, PHY is enhanced with multiple-input multiple-output (MIMO) antenna technologies, channel bonding, short guard intervals (SGI), enhanced modulation and coding schemes (MCS). At the same time, MAC layer overhead is reduced by introducing frame aggregation and block acknowledgement technologies. However, existing studies reveal that although PHY and MAC enhancements promise to improve physical data rate significantly, they yield negative impact over upper layer protocols -mainly for reliable end-to-end transport/application layer protocols. As a consequence, a large number of schools have focused researches on HT-WLANs to improve the coordination among PHY/MAC and upper layer protocols and thus, boost up the performance benefit. In this survey, we discuss the impact of enhancements of PHY/MAC layer in HT-WLANs over transport/application layer protocols. Several measures have been reported in the literature that boost up data rate of WLANs and use aforesaid enhancements effectively for performance benefit of end-to-end protocols. We also point out limitations of existing researches and list down different open challenges that can be explored for the development of next generation HT-WLAN technologies.

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Performance Analysis of Downlink MU-TXOP Sharing in IEEE 802.11ac

Cited by 12 publications

References 10 publications

Uplink Access Protocol in IEEE 802.11ac

Uplink Access Protocol in IEEE 802.11ac

Throughput Performance Analysis of DL-MU-MIMO for the IEEE 802.11ac Wireless LAN

Impact of IEEE 802.11n/ac PHY/MAC High Throughput Enhancements on Transport and Application Protocols—A Survey

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