Wi-Fi Channel Bonding: An All-Channel System and Experimental Study From Urban Hotspots to a Sold-Out Stadium

Barrachina‐Muñoz, Sergio; Bellalta, Boris; Knightly, Edward W.

doi:10.1109/tnet.2021.3077770

Cited by 21 publications

(18 citation statements)

References 40 publications

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“…The work [25] analytically studies the performance of a multi-channel bonding mechanism that supports delay-sensitive multimedia applications. The work in [26] presents a system to simultaneously measure all Wi-Fi channels that support channel bonding in the 5 GHz band with a microsecond scale granularity. The authors in [27] propose an online decentralized primary channel selection approach for dynamic channel bonding, that improves the network throughput by considering both the availability of the primary channel and the pursuit of the secondary channels.…”

Section: Existing Approaches and Their Limitationsmentioning

confidence: 99%

IBAC: An Intelligent Dynamic Bandwidth Channel Access Avoiding Outside Warning Range Problem

Karmakar,

Kaddoum

2022

Preprint

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IEEE 802.11ax uses the concept of primary and secondary channels, leading to the Dynamic Bandwidth Channel Access (DBCA) mechanism. By applying DBCA, a wireless station can select a wider channel bandwidth, such as 40/80/160 MHz, by applying the channel bonding feature. However, during channel bonding, inappropriate bandwidth selection can cause collisions. Therefore, to avoid collisions, a well-developed media access control (MAC) protocol is crucial to effectively utilize the channel bonding mechanism. In this paper, we address a collision scenario, called Outside Warning Range Problem (OWRP), that may occur during DBCA when a wireless station interferes with another wireless station after channel bonding is performed. Therefore, we propose a MAC layer mechanism, Intelligent Bonding Avoiding Collision (IBAC), that adapts the channel bonding level in DBCA in order to avoid the OWRP. We first design a theoretical model based on Markov chains for DBCA while avoiding the OWRP. Based on this model, we design a Thompson sampling based Bayesian approach to select the best possible channel bonding level intelligently. We analyze the performance of the IBAC through simulations where it is observed that, comparing to other competing mechanisms, the proposed approach can enhance the network performance significantly while avoiding the OWRP.

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Section: Existing Approaches and Their Limitationsmentioning

confidence: 99%

IBAC: An Intelligent Dynamic Bandwidth Channel Access Avoiding Outside Warning Range Problem

Karmakar,

Kaddoum

2022

Preprint

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“…In the dataset, spectrum samples consist of 1 s of consecutive, 10 µs receive signal strength indicator (RSSI) measurements. We refer the reader to [20], [21] for further…”

Section: A Waca Datasetmentioning

confidence: 99%

“…details on the dataset. Compared to [20], [21], in this work we have implemented a wholly new Wi-Fi state machine, capable of (i) fully characterizing the temporal dynamics of the system under finite traffic loads, i.e., non-full buffer conditions, and (ii) supporting multiple Wi-Fi interfaces and packet buffers.…”

Section: Environment Activitymentioning

confidence: 99%

“…In this paper, capitalizing on over-the-air measurements of spectrum occupancy for the entire 5 GHz band recently collected [20], [21] and freely available in open source 1 , we experimentally investigate the latency 2 performance of 802.11be MLO. Atop these traces, which include scenarios with high access point (AP) density and crowded environments and span multiple hours, we develop an emulation tool that fuses a Wi-Fi MLO state machine with the high-resolution spectrum measurements.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study of Latency for IEEE 802.11be Multi-link Operation

Carrascosa¹,

Geraci²,

Knightly³

et al. 2021

Preprint

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Will Multi-Link Operation (MLO) be able to improve the latency of Wi-Fi networks? MLO is one of the most disruptive MAC-layer techniques included in the IEEE 802.11be amendment. It allows a device to use multiple radios simultaneously and in a coordinated way, providing a new framework to improve the WLAN throughput and latency. In this paper, we investigate the potential latency benefits of MLO by using a large dataset containing 5 GHz spectrum occupancy measurements. Experimental results show that when the channels are symmetrically occupied, MLO can improve latency by one order of magnitude. In contrast, in asymmetrically occupied channels, MLO can sometimes be detrimental and increase latency. To address this case, we introduce Opportunistic Simultaneous Transmit and Receive (STR+) channel access and study its benefits. M. Carrascosa and B. Bellalta were supported by WINDMAL PGC2018-099959-B-I00 (MCIU/AEI/FEDER,UE) and Cisco. G. Geraci was supported by MINECO's Project RTI2018-101040 and by a "Ramón y Cajal" Fellowship from the Spanish State Research Agency. II. MULTI-RADIO MULTI-LINK OPERATION IEEE 802.11be considers two main channel access methods to support Multi-link Operation: Simultaneous Transmit and Receive (MLO-STR), and Non-simultaneous Transmit and 1 WACA dataset: https://github.com/sergiobarra/WACA WiFiAnalyzer. 2 The terms latency and delay are used interchangeably throughout the paper.

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“…In other approaches, the frequency range used or intended to be used in the selected application is subjected to measurements and analysis [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. In this case, researchers give particular attention to 2.4 GHz and 5 GHz ISM bands, widely used by WLAN devices [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Channel Occupancy Measurements in 868 MHz ISM Band in Residential Areas

Kozlowski

Kurek

2021

Sensors

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The rapid development of Internet of Things (IoT) has led to more and more devices using ISM frequency bands. Because they are not time synchronized, medium access collisions are unavoidable. The probability of such a collision is usually reasonably low; however, it increases with the number of transmitters competing for the same frequency channel. For this reason, ISM bands’ occupancy is regularly monitored by researchers. This paper presents the results of the measurement campaign during which a selected part of the 868 MHz ISM frequency band was monitored for the presence of transmissions in six locations in various residential areas in Warsaw, Poland. For the purpose of the campaign, a dedicated measurement set-up comprising a software-defined radio (SDR) module was assembled. The measurements results showed that the channel occupancy is in most cases lower than 1% with a maximum observed value of 2%. The paper presents selected characteristics of the detected signals. Additionally, distribution over time of the detected signals was used together with the Monte Carlo simulations to analyze how long idle time blocks are available for new transmitters that could be deployed in the band under testing.

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Wi-Fi Channel Bonding: An All-Channel System and Experimental Study From Urban Hotspots to a Sold-Out Stadium

Cited by 21 publications

References 40 publications

IBAC: An Intelligent Dynamic Bandwidth Channel Access Avoiding Outside Warning Range Problem

IBAC: An Intelligent Dynamic Bandwidth Channel Access Avoiding Outside Warning Range Problem

An Experimental Study of Latency for IEEE 802.11be Multi-link Operation

Channel Occupancy Measurements in 868 MHz ISM Band in Residential Areas

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