A Novel Contention Window Control Scheme Based on a Markov Chain Model in Dense WLAN Environment

Yoshiaki, Morino; Hiraguri, Takefumi; Yoshino, Hideaki; Nishimori, Kentaro; Tachibana, Akira; Matsuda, Takahiro

doi:10.1109/aims.2015.72

Cited by 8 publications

(8 citation statements)

References 5 publications

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“…Therefore, the solutions that were discussed in many literatures are to dynamically adjust the CW value. In [4], the authors obtain an optimal CW value by estimating the number of nodes according to a collision probability mechanism. In [5], the authors propose an adaptive practical channel observation-based scaled backoff (COSB) to scale-up and scale-down the CW according to the channel observation-based conditional collision probability, which achieves higher throughout and shorter delay.…”

Section: Related Workmentioning

confidence: 99%

“…For comparison, we also present the system throughput of DCF mechanism that is derived in [4], denoted as S DCF , is given by…”

Section: Performance Analysismentioning

confidence: 99%

“…Therefore, there is a pervasive viewpoint that channel access mechanism should be designed more sophisticated to overcome the highly challenging in dense network scenarios. Furthermore, various mechanisms for tuning the CW sizes were proposed in [4][5][6][7][8][9] to mitigate collision and improve throughput. The issue that the network capacity will be severely underutilized when the legacy DCF operates as core part of WLANs has already been recognized.Recently, the standardization of IEEE 802.11ax [10] has been initiated and one of its prime goals is to increase the capacity of Medium Access Control (MAC) in dense WLANs.…”

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confidence: 99%

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Decoupling-Based Channel Access Mechanism for Improving Throughput and Fairness in Dense Multi-Rate WLANs

2019

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Legacy IEEE 802.11 Medium Access Control (MAC) adopts the Distributed Coordination Function (DCF) mechanism, which provides the same access opportunity for all contenders. However, in dense multi-rate Wireless Local Area Networks (WLANs), the pure distributed control mechanism will cause high collision rate and performance anomaly, which results in low network utilization and wasting valuable channel resources. In this paper, we present a decoupling MAC mechanism (DMAC) based on the idea of contention/reservation to reduce collision and realize collision free data transmission. In proposed mechanism, the channel access time is partitioned into channel contention process and data transmission process. The proposed algorithm makes full use of the distributed random channel access mechanism and performs a centralized collision-free data transmission. Wherein, we also design an adaptive algorithm to adjust the length of the contention period to improve the channel utilization. Furthermore, we further propose two airtime fairness algorithms Improve-DMAC1 (I-DMAC1) and Improve-DMAC2 (I-DMAC2) for delay sensitive network and high throughput network scenarios, respectively, to solve the performance anomaly in multi-rate WLANs, based on DMAC. We verify the effectiveness of these decoupling algorithms through extensive simulations. Moreover, the simulation results show that the proposed algorithms achieve better performance than the 802.11 standard and other protocols.

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Section: Related Workmentioning

confidence: 99%

“…For comparison, we also present the system throughput of DCF mechanism that is derived in [4], denoted as S DCF , is given by…”

Section: Performance Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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Decoupling-Based Channel Access Mechanism for Improving Throughput and Fairness in Dense Multi-Rate WLANs

2019

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“…Using CW threshold (CW Threshold ), the traffic is categorized in DCBTA. A novel CW control scheme proposed in [13] analyzes IEEE 802.11 DCF parameters effect such as CW and RL (Retry Limit) in industrial applications including short packet and noisy environment [14].…”

Section: Related Workmentioning

confidence: 99%

Mobile Wi-Fi based Scheduling for Body Area Networks

Nazir¹

2017

IJCA

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“…The intermediate nodes act as routers to forward data packets of other nodes for quality-of-service (QoS) provisioning. However, when the number of data transmitting nodes increases and generate a high amount of data, the performance of MAC layer protocols degrades dramatically in terms of fairness, throughput, and delay [1]. This can further degrade QoS parameters such as loss of accurate information, and delivery of information after due time.…”

Section: Introductionmentioning

confidence: 99%

A QoS-aware Secured Communication Scheme for IoT-based Networks

Khan¹,

Au²,

Yahya³

et al. 2019

Preprint

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The Internet of Things (IoT) is an emerging technology that aims to enable the interconnection of a large number of smart devices and heterogeneous networks. Ad hoc networks play an important role in the designing of IoT-enabled platforms due to their efficient, flexible, low-cost, and dynamic infrastructures. These networks utilize the available resources efficiently to maintain the Quality of Service (QoS) in a multi-hop communication. However, in a multi-hop communication, the relay nodes can be malicious, thus requiring a secured and reliable data transmission. In this paper, we propose a QoS-aware secured communication scheme for IoT-based networks (QoS-IoT). In QoS-IoT, a Sybil attack detection mechanism is used for the identification of Sybil nodes and their forged identities in multi-hop communication. %by high-power and mobile nodes. After Sybil nodes detection, an optimal contention window (CW) is selected for QoS provisioning, i.e., to achieve per-flow fairness and efficient utilization of the available bandwidth. In a multi-hop communication, the MAC layer protocols do not perform well in terms of fairness and throughput, especially when the nodes generate a large amount of data. It is because the MAC layer has no capability of providing QoS to prioritized or forwarding flows. We evaluate the performance of QoS-IoT in terms of Sybil attack detection, fairness, throughput, and buffer utilization. The simulation results show that the proposed scheme outperforms the existing schemes and significantly enhances the performance of the network with a large volume of data. Moreover, the proposed scheme is resilient against Sybil attack.

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A Novel Contention Window Control Scheme Based on a Markov Chain Model in Dense WLAN Environment

Cited by 8 publications

References 5 publications

Decoupling-Based Channel Access Mechanism for Improving Throughput and Fairness in Dense Multi-Rate WLANs

Decoupling-Based Channel Access Mechanism for Improving Throughput and Fairness in Dense Multi-Rate WLANs

Mobile Wi-Fi based Scheduling for Body Area Networks

A QoS-aware Secured Communication Scheme for IoT-based Networks

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