Performance analysis of the 802.11ax UL OFDMA random access protocol in dense networks

Lanante, Leonardo; Uwai, Hiroshi Ochi Tatsumi; Nagao, Yuhei; Kurosaki, Masayuki; Ghosh, Chittabratta

doi:10.1109/icc.2017.7997340

Cited by 47 publications

(11 citation statements)

References 4 publications

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“…Several recent studies have not only provided advanced features for improving the performance of 802.11ax, but have also presented numerical analysis based on mathematical modeling [6,7,8,9,10]. Lanante et al provide an analytical model for 802.11ax UL OFDMA with saturated network throughput [6]. Naik et al consider diverse OFDMA scenarios by applying the latest 802.11ax amendment in their model [7].…”

Section: Related Workmentioning

confidence: 99%

“…Since the standard is still being developed, performance analysis through mathematical modeling is of paramount importance, and researchers have published numerous analytical studies on the 802.11ax MAC protocol [6,7,8,9,10]. Unfortunately, most of these provide only limited analytical results, making it difficult to obtain a complete understanding of 802.11ax.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of the IEEE 802.11ax MAC Protocol for Heterogeneous Wi-Fi Networks in Non-Saturated Conditions

Lee

2019

Sensors

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The IEEE 802.11ax standard, which realizes multi-user transmission based on orthogonal frequency division multiple access (OFDMA), has been highlighted as a key technology to meet high future demand for Wi-Fi systems. Since this standard is still being developed, performance analysis through mathematical modeling is of paramount importance; however, existing studies have several limitations. Firstly, most of these consider only the saturation network throughput, whereas for 802.11ax in particular, the access delay of the nodes needs to be studied carefully, since they no longer acquire the medium independently but depend solely on the access point’s (AP’s) schedule. Secondly, since the network performance may be affected to a greater extent by legacy nodes than by 802.11ax nodes, it is desirable to consider various heterogeneous cases of networks with existing legacy nodes. In this paper, a new analytical framework for the 802.11ax MAC protocol is provided. Markov-chain-based models are developed to represent the behavior of the 802.11ax nodes, and both non-saturated traffic conditions and co-existence with the legacy nodes are considered. Through both analysis and MATLAB simulations, it is shown that the proposed model accurately evaluates the throughput and the delay performance under various network conditions.

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Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Analysis of the IEEE 802.11ax MAC Protocol for Heterogeneous Wi-Fi Networks in Non-Saturated Conditions

Lee

2019

Sensors

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“…As the IEEE 802.11ax standard has been developed, the specific procedure of UORA has been defined. To modify and correct the Markov model and the analysis method, Lanante et al tried to generate a more generalized model and analysis method [37]. Many researchers have tried to evaluate its performance, especially its efficiency and throughput [38,39].…”

Section: System Modelmentioning

confidence: 99%

A Novel WLAN Vehicle-To-Anything (V2X) Channel Access Scheme for IEEE 802.11p-Based Next-Generation Connected Car Networks

Ahn

Kim

2018

Applied Sciences

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To support a massive number of connected cars, a novel channel access scheme for next-generation vehicle-to-anything (V2X) systems is proposed in this paper. In the design of the proposed scheme, two essential aspects are carefully considered: backward compatibility and massive V2X support. Since IEEE 802.11p-based V2X networks are already being deployed and used for intelligent transport systems, next-generation V2X shall be designed considering IEEE 802.11p-based V2X networks to provide backward compatibility. Since all future cars are expected to be equipped with a V2X communication device, a dense V2X communication scenario will be common and massive V2X communication support will be required. In the proposed scheme, IEEE 802.11-based extension is employed to provide backward compatibility and the emerging IEEE 802.11ax standard-based orthogonal frequency-division multiple access is adopted and extended to provide massive V2X support. The proposed scheme is further extended with a dedicated V2X channel and a scheduled V2X channel access to ensure high capacity and low latency to meet the requirements of the future V2X communication systems. To demonstrate the performance of the proposed scheme thoroughly and rigorously, the proposed scheme is mathematically analyzed using a Markov model and extensive simulations are performed. In the dense V2X communication networks of the future, the proposed V2X communication scheme will provide high performance and reliability.

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“…Several studies [ 14 , 15 , 16 , 17 , 18 ] have proposed performance analysis methods for UORA based on a two-dimensional Markov chain model [ 19 ]. At the early stage of IEEE 802.11ax standardization, the authors in [ 14 ] established an analytic model to evaluate the throughput of UORA with which the optimal number of RA-RUs can be obtained to maximize the throughput.…”

Section: Introductionmentioning

confidence: 99%

“…At the early stage of IEEE 802.11ax standardization, the authors in [ 14 ] established an analytic model to evaluate the throughput of UORA with which the optimal number of RA-RUs can be obtained to maximize the throughput. Similar to [ 14 ], another analytic model for UORA was proposed by [ 15 ]. As well as providing models of throughput and channel efficiency, a throughput optimization algorithm was proposed under the assumption that the AP can estimate the number of STAs.…”

Section: Introductionmentioning

confidence: 99%

OFDMA Backoff Control Scheme for Improving Channel Efficiency in the Dynamic Network Environment of IEEE 802.11ax WLANs

Kim

Kwon

Park

2021

Sensors

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IEEE 802.11ax uplink orthogonal frequency division multiple access (OFDMA)-based random access (UORA) is a new feature for random channel access in wireless local area networks (WLANs). Similar to the legacy random access scheme in WLANs, UORA performs the OFDMA backoff (OBO) procedure to access the channel and decides on a random OBO counter within the OFDMA contention window (OCW) value. An access point (AP) can determine the OCW range and inform each station (STA) of it. However, how to determine a reasonable OCW range is beyond the scope of the IEEE 802.11ax standard. The OCW range is crucial to the UORA performance, and it primarily depends on the number of contending STAs, but it is challenging for the AP to accurately and quickly estimate or keep track of the number of contending STAs without the aid of a specific signaling mechanism. In addition, the one for this purpose incurs an additional delay and overhead in the channel access procedure. Therefore, the performance of a UORA scheme can be degraded by an improper OCW range, especially when the number of contending STAs changes dynamically. We first observed the effect of OCW values on channel efficiency and derived its optimal value from an analytical model. Next, we proposed a simple yet effective OBO control scheme where each STA determines its own OBO counter in a distributed manner rather than adjusting the OCW value globally. In the proposed scheme, each STA determines an appropriate OBO counter depending on whether the previous transmission was successful or not so that collisions can be mitigated without leaving OFDMA resource units unnecessarily idle. The results of a simulation study confirm that the throughput of the proposed scheme is comparable to the optimal OCW-based scheme and is improved by up to 15 times compared to the standard UORA scheme.

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Performance analysis of the 802.11ax UL OFDMA random access protocol in dense networks

Cited by 47 publications

References 4 publications

Performance Analysis of the IEEE 802.11ax MAC Protocol for Heterogeneous Wi-Fi Networks in Non-Saturated Conditions

Performance Analysis of the IEEE 802.11ax MAC Protocol for Heterogeneous Wi-Fi Networks in Non-Saturated Conditions

A Novel WLAN Vehicle-To-Anything (V2X) Channel Access Scheme for IEEE 802.11p-Based Next-Generation Connected Car Networks

OFDMA Backoff Control Scheme for Improving Channel Efficiency in the Dynamic Network Environment of IEEE 802.11ax WLANs

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