Modifying Backoff Freezing Mechanism to Optimize Dense IEEE 802.11 Networks

Karaca, Mehmet; Bastani, Saeed; Landfeldt, Bjorn

doi:10.1109/tvt.2017.2705343

Cited by 24 publications

(14 citation statements)

References 21 publications

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“…In the backoff scheme proposed in Ref. [15], stations do not attempt to tune the contention window but make a small modification in the backoff freezing process to determine the optimal configuration, which improves network throughput even under densely populated networks. The Exponential Increased exponential decreased (EIED) backoff algorithm under fading channel errors was modeled by a discrete time Markov chain, and the EIED is better than the traditional backoff scheme under saturated throughput with fading channel errors [16] .…”

Section: Related Workmentioning

confidence: 99%

Retransmission Number Aware Channel Access Scheme for IEEE 802.11ax Based WLAN

et al. 2020

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Section: Related Workmentioning

confidence: 99%

Retransmission Number Aware Channel Access Scheme for IEEE 802.11ax Based WLAN

et al. 2020

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“…Although the above algorithms can be applied to a dynamic network environment, they need to be simultaneously executed on nodes and AP and result in extra operating cost. Therefore, [15] and [16] present two algorithms that do not require any hardware modifications and only run on nodes. In [15], all of the nodes decrease the back-off counter with a certain probability that can be calculated by some available network parameters during the idle time.…”

Section: Related Workmentioning

confidence: 99%

“…Therefore, [15] and [16] present two algorithms that do not require any hardware modifications and only run on nodes. In [15], all of the nodes decrease the back-off counter with a certain probability that can be calculated by some available network parameters during the idle time. In [16], the AP can calculate and assign a back-off value for nodes by running a VBA algorithm in the back-off stage after nodes successfully transmit.…”

Section: Related Workmentioning

confidence: 99%

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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“…In CCT-SDN, the data transmission of the uplink utilizes the DCF mechanism with BEB [33]. However, the downlink transmission decision of APs is made by the controller governed by our concurrent transmission decision algorithm.…”

Section: Concurrent Transmission Decision Algorithmmentioning

confidence: 99%

SDN-Based Centralized Downlink Scheduling with Multiple APs Cooperation in WLANs

Lei

Wang

Xia

2019

Wireless Communications and Mobile Computing

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Conventional DCF and RTS/CTS mechanisms perform the channel contention by a distributed and independent manner, which can lead to severe cochannel interference and low channel utilization in multiple APs dense deployment scenario. In this paper, we propose a channel scheduling cooperation algorithm called CCT-SDN (centralized concurrent transmission based on SDN) that enables multiple APs (Access Points) to perform cooperatively a centralized downlink transmission control, thus achieving higher system throughput and channel utilization by avoiding cochannel interference and implementing concurrent transmission. This design inherits the merit of the conventional distributed random channel access and adopts standardized OpenFlow protocol and Software Defined Network (SDN) architecture to make a centralized concurrent downlink traffic transmission decision among APs. Meanwhile, we also present a novel neighborhood relation storage scheme called SPRIM to enhance the retrieving efficiency of SDN controller, which enables CCT-SDN to perform a real-time control. Moreover, we also develop a theoretical model to prove the improvement of CCT-SDN. Furthermore, our solution does not require any modifications to existing ubiquitous 802.11 terminal devices and thus is likely to be widely deployed. Finally, extensive simulation results on Mininet-WiFi verify that CCT-SDN can achieve significant performance in terms of aggregate throughput, channel utilization, and packet loss rate in different deployment scenarios.

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Modifying Backoff Freezing Mechanism to Optimize Dense IEEE 802.11 Networks

Cited by 24 publications

References 21 publications

Retransmission Number Aware Channel Access Scheme for IEEE 802.11ax Based WLAN

Retransmission Number Aware Channel Access Scheme for IEEE 802.11ax Based WLAN

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

SDN-Based Centralized Downlink Scheduling with Multiple APs Cooperation in WLANs

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