Advanced Wireless LAN Technologies

Gong, Michelle X.; Hart, B.D.; Mao, Shiwen

doi:10.1145/2721914.2721933

Cited by 51 publications

(22 citation statements)

References 6 publications

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“…Figure 5 plots the standard deviation of the MAC access delay versus the number of nodes, where the theoretical results are calculated by Eq. (12). From this figure, we can see that the standard deviation increases as n increases when d = 5, 10 ms.…”

Section: Performance Evaluationmentioning

confidence: 70%

“…In this situation, the conventional 802.11 distributed coordination function (DCF) protocol [8] (where each node is limited to send at most one data packet upon each transmission opportunity) is hard to meet the growing traffic transmission requirements. To improve the transmission efficiency, the frame aggregation technology (i.e., multiple packets are aggregated into a super-frame for one transmission) has been proposed and adopted by 802.11 EDCA [8], 802.11n [9][10][11], and the latest 802.11ac [12,13]. 802.11 EDCA is an amendment of DCF.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and optimization of delayed channel access for wireless cyber-physical systems

Feng

Cheng

et al. 2016

J Wireless Com Network

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In wireless cyber-physical systems (CPS), with a growing number of sensors being deployed, more and more data will be transmitted over wireless links. This essentially requires that wireless network protocols should be further studied and amended to improve their transmission efficiency. The delayed channel access (DCA) protocol is of great practical importance in improving channel utilization. DCA is an improved version of IEEE 802.11 distributed coordination function (DCF). In DCA, a node first waits for an extra delay before it enters the normal DCF procedure, so that more packets can be aggregated and transmitted upon each transmission opportunity. However, how the extra delay affects the performance of DCA has never been theoretically investigated. In this paper, we first propose a theoretical model to characterize the impact of a deterministic extra delay on collision probability, throughput, and medium access control (MAC) delay. With this model, we perform asymptotic analysis to calculate the optimal deterministic delay that can maximize the system throughput. We find that the system performance is significantly affected by the relationship between the deterministic delay and the number of nodes; and therefore, carefully choosing a suitable deterministic delay is crucial in improving channel utilization. The extensive ns2 simulations verify that our model is very accurate, and the theoretical optimal deterministic delay can make the system achieve the maximum system throughput. This study is very useful for better designing and implementing the packet aggregation technology that has been adopted by IEEE wireless networking standards including 802.11n and the latest 802.11ac.

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Section: Performance Evaluationmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of delayed channel access for wireless cyber-physical systems

Feng

Cheng

et al. 2016

J Wireless Com Network

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“…The data rates of Wi-Fi communication have increased significantly over the last decade and can exceed 1 Gbit/s [94]. Wi-Fi coverage varies from 30 to 250 meters [95], [96] for indoor and outdoor environments respectively.…”

Section: Survey Of Phy Channelsmentioning

confidence: 99%

Survey and Systematization of Secure Device Pairing

Fomichev

Álvarez

Steinmetzer

et al. 2018

IEEE Commun. Surv. Tutorials

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Abstract-Secure Device Pairing (SDP) schemes have been developed to facilitate secure communications among smart devices, both personal mobile devices and Internet of Things (IOT) devices. Comparison and assessment of SDP schemes is troublesome, because each scheme makes different assumptions about out-of-band channels and adversary models, and are driven by their particular use-cases. A conceptual model that facilitates meaningful comparison among SDP schemes is missing. We provide such a model. In this article, we survey and analyze a wide range of SDP schemes that are described in the literature, including a number that have been adopted as standards. A system model and consistent terminology for SDP schemes are built on the foundation of this survey, which are then used to classify existing SDP schemes into a taxonomy that, for the first time, enables their meaningful comparison and analysis. The existing SDP schemes are analyzed using this model, revealing common systemic security weaknesses among the surveyed SDP schemes that should become priority areas for future SDP research, such as improving the integration of privacy requirements into the design of SDP schemes. Our results allow SDP scheme designers to create schemes that are more easily comparable with one another, and to assist the prevention of persisting the weaknesses common to the current generation of SDP schemes.

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“…It uses OFDM level information exchange to make channel assignment decisions locally and try to circumvents both hidden and exposed terminal problems. The 802.11ac standard in wave-2 [26] also supports a non-contiguous 160 MHz (80 + 80 MHz) channels are comprised of any two valid, non-adjacent 80 MHz channels.…”

Section: Combining Fragmented Channelsmentioning

confidence: 99%

MulWiFi: Flexible Policy Enforcement in Multi-Radio High-Speed WiFi Networks

Nishat¹,

Uzmi²,

Qazi³

2017

ijacsa

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Abstract-As data rates in 802.11 Wireless LANs (WLANs) scale to Gbps, it becomes increasingly challenging for a single radio resource to meet the goals of high MAC efficiency, service differentiation, and adaptability to diverse network scenarios. We present MulWiFi, a system that uses a centralized controller to manage multiple off-the-shelf radios in a single device for addressing challenges in high-speed WLANs. MulWiFi allows flexible policy enforcement based on application requirements and channel state information at each radio. MulWiFi offers the ability to 1) customize the MAC based on application requirements and network scenarios; 2) assign different roles to radios; 3) improve MAC throughput efficiency at high data rates; and 4) combine fragmented channels. We demonstrate the early promise of MulWiFi through three case studies and discuss future opportunities and challenges.

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Advanced Wireless LAN Technologies

Cited by 51 publications

References 6 publications

Analysis and optimization of delayed channel access for wireless cyber-physical systems

Analysis and optimization of delayed channel access for wireless cyber-physical systems

Survey and Systematization of Secure Device Pairing

MulWiFi: Flexible Policy Enforcement in Multi-Radio High-Speed WiFi Networks

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