IEEE 802.11ac: Enhancements for very high throughput WLANs

Ong, Eng Hwee; Kneckt, Jarkko; Alanen, Olli; Chang, Zheng; Huovinen, T.; Nihtilä, Timo

doi:10.1109/pimrc.2011.6140087

Cited by 81 publications

(33 citation statements)

References 5 publications

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“…Ong et al [17] provide a detailed description of the enhancements and mandatory/optional features of 802.11ac: channel bonding of up to eight 20 MHz channels (two in 802.11n), MIMO enhancement allowing up to eight spatial streams (four in 802.11n), as well as an increased highest order modulation (from 64-QAM to 256-QAM). They then perform an in-depth theoretical analysis of 802.11ac and 802.11n in a saturated, error-free network and show how the enhancements of 802.11ac (channel width and MIMO) can result in an 84% increase from 802.11n's throughput.…”

Section: Ieee 80211ac/axmentioning

confidence: 99%

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A Markov model for performance evaluation of channel bonding in IEEE 802.11

2021

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The ever-growing popularity of Wireless Local Area Networks (WLANs) in home, public, and work environments is fuelling the need for WLANs that can accommodate more stations, each with higher throughput. This typically results in WLANs containing a larger number of heterogeneous devices, making the prediction of the network's behavior and its efficient configuration an even more elaborate problem. In this paper, we propose a Markovian model that predicts the throughput achieved by each Access Point (AP) of the WLAN as a function of the network's topology and the AP's throughput demands. By means of simulation, we show that our model achieves mean relative errors of around 10% for networks of different sizes and with diverse node configurations. The model is adapted to the specification of IEEE 802.11 standards that implement channel bonding, namely 802.11n/ac/ax, and as such it can be used to provide insight into issues of channel assignment when using channel bonding. We derive guidelines on the best practice in static channel bonding given a performance metric and for different node characteristics such as the Modulation and Coding Scheme (MCS) indexes, frame aggregation rates, saturation levels, and network topologies. We then put our findings to the test by identifying the optimal channel bonding combination in an 802.11ac WLAN containing nodes with diverse characteristics. We conclude that the optimal solution is highly dependent on the particular network configuration. However, we find that, in general, larger channels are better suited for throughput maximization and smaller (and separate) channels render higher fairness.

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Section: Ieee 80211ac/axmentioning

confidence: 99%

“…We also consider fixed average frame length and static channel bonding. For a more detailed description of those features and the internal functioning of IEEE 802.11ac, we refer the reader to [41,17].…”

Section: System Descriptionmentioning

confidence: 99%

A Markov model for performance evaluation of channel bonding in IEEE 802.11

2021

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“…Wi-Fi network supports varying levels of performance, depending on the technology standard. Research [22] introduces a key mandatory and optional PHY features, as well as the MAC enhancements of 802.11 (ac) over the existing 802.11 (n) standard in the evolution towards higher data rates. They compare the MAC performance between 802.11 (ac) and 802.11 (n) over three different frame aggregation mechanisms, viz., aggregate MAC service data unit (A-MSDU), aggregate MAC protocol data unit (A-MPDU), and hybrid A-MSDU/A-MPDU aggregation through numerical analysis and simulations.…”

Section: Wi-fi Performancementioning

confidence: 99%

Protocol Heterogeneity Issues of Incremental High-Density Wi-Fi Deployment

Gebre-Amlak

Islam

Cummins

et al. 2018

Lecture Notes in Computer Science

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Going beyond the traditional coverage-oriented Wi-Fi network design, the recent Wi-Fi networks are designed for high traffic demand with high density deployments. A university campus environment is particularly unique in that a large number of users with multiple heterogeneous devices demand high capacity and performance from a wireless network over a wide geographical area. From a network management perspective, not only should the network support heterogeneous Wi-Fi protocols and devices, but high-density access points (APs) are needed to handle the high traffic demands. To meet the rising demands Wi-Fi AP upgrades are deployed incrementally over an extended period to cover the vast area found in a campus setting, which is different from a building-level Wi-Fi network. In this paper, we present a measurement study to bring forth wireless network management issues faced during incremental Wi-Fi deployment on a university campus network. We discuss various design considerations given to incremental deployments of Wi-Fi 802.11 (ac) including replacing older Wi-Fi versions, and addressing compatibility, data rate, coverage, and performance concerns. In addition, we perform pre-and-post upgrade evaluations using different network performance analysis tools. This study will shed light on heterogeneous large-scale Wi-Fi network management issues, as these will become applicable with the increasing prevalence of large metro area wireless networks.

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“…The previous paper analyzed the IEEE 802.11b/g/a/n MAC performance for wireless LAN with error-free and errorprone channel [3,[5][6][7]. Papers related to IEEE 802.11ac also analyzed MAC throughput, but did not consider mobile ad-hoc and error-prone environment that is applied to most wireless LAN [8][9][10][11]. So, this paper extends the previous IEEE 802.11ac performance researches and analyzes the IEEE 802.11ac MAC performance for mobile ad-hoc LAN under the errorprone channel environment.…”

Section: Ha Cheol Lee Yuhan University Koreamentioning

confidence: 99%

A MAC Performance of Mobile Ad hoc 802 11ac LAN Over Correlated Fading Channel

Cheol¹

2015

Third International Conference on Advances in Computing, Control and Networking - ACCN 2015

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Abstract-FER (Frame ErrorRate Ⅰ. INTRODUCTIONOver the past few years, wireless LAN have been deployed rapidly across enterprises, homes, public sectors and service providers due to mobility, flexibility, interoperability and cost-effective deployment. It is expected that wireless LAN have emerged as a promising network for future IP applications. When wireless channel experiences fading, bit errors occur and its performance decreases largely. Also, with the limited frequency resources, designing an effective MAC protocol is a hot challenge. The legacy IEEE 802.11b and 802.11g/a specification provide up to 11 and 54 Mbps data rates, respectively. They employs a CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) protocol with binary exponential back-off as the MAC protocol. IEEE 802.11n allows coexistence with IEEE 802.11b/g/a legacy devices [1]. It delivers a theoretical maximum throughput of 600 Mbps at physical layer and has maximum data throughput of at least 100 Mbps as measured at the MAC SAP(Service Access Point). IEEE 802.11ac is an amendment to IEEE 802.11 for very high throughput (VHT) operation in frequency bands below 6 GHz, excluding 2.4 GHz (i.e., unlicensed bands at 5 GHz band) [2]. The previous researches have been executed on the DCF performance over wireless LAN [3]. ______________________________________________ Ha Cheol Lee Yuhan University KoreaIn case of IEEE 802.11n, the throughput performance at the MAC layer can be improved by aggregating several frames before transmission [4]. Frame aggregation not only reduces the transmission time for preamble and frame headers, but also reduces the waiting time during CSMA/CA random backoff period for successive frame transmissions. Under error-prone channels, corrupting a large aggregated frame may waste a long period of channel time and lead to a lower MAC efficiency. The previous paper analyzed the IEEE 802.11b/g/a/n MAC performance for wireless LAN with error-free and errorprone channel [3,[5][6][7]. Papers related to IEEE 802.11ac also analyzed MAC throughput, but did not consider mobile ad-hoc and error-prone environment that is applied to most wireless LAN [8][9][10][11]. So, this paper extends the previous IEEE 802.11ac performance researches and analyzes the IEEE 802.11ac MAC performance for mobile ad-hoc LAN under the errorprone channel environment. In Section 2, IEEE 802.11ac PHY and MAC layer are reviewed. In Section 3 and Section 4, saturation throughput with bit errors appearing in the wireless channel are numerically analyzed and evaluated. In Section 5, it is concluded with remarks.

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IEEE 802.11ac: Enhancements for very high throughput WLANs

Cited by 81 publications

References 5 publications

A Markov model for performance evaluation of channel bonding in IEEE 802.11

A Markov model for performance evaluation of channel bonding in IEEE 802.11

Protocol Heterogeneity Issues of Incremental High-Density Wi-Fi Deployment

A MAC Performance of Mobile Ad hoc 802 11ac LAN Over Correlated Fading Channel

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