CSMA/CQ: A Novel SDN-Based Design to Enable Concurrent Execution of Channel Contention and Data Transmission in IEEE 802.11 Networks

Zhao, Qinglin; Xu, Fangxin; Yang, Jie; Zhang, Yujun

doi:10.1109/access.2017.2665554

Cited by 10 publications

(10 citation statements)

References 29 publications

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“…Existing studies of SDN-aware protocols mainly consider exploiting SDN for wireless MAC access [9], [10], [11], [12], [13]. However, none of these studies supports SIC transmission.…”

Section: B Sdn-aware Designsmentioning

confidence: 99%

“…However, none of these studies supports SIC transmission. CSMA/CQ [9] aims to enable concurrent control and data channels. The whole channel is separated into two individual channels based on the OFDMA technique.…”

Section: B Sdn-aware Designsmentioning

confidence: 99%

“…The contention antenna works on the contention subchannel, and the transmission antenna works on the transmission subchannel. We assume that these two antennas can work concurrently as in [9]. Multi-CQ executes the contention process and the transmission process in parallel.…”

Section: Multi-cq Protocolmentioning

confidence: 99%

See 2 more Smart Citations

A Novel Successive-Interference-Cancellation- Aware Design for Wireless Networks Using Software-Defined Networking

Zhao

Feng

et al. 2021

IEEE Access

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In traditional CSMA/CA-based MAC designs supporting successive interference cancellation (SIC), channel utilization is inefficient, because the inherited CSMA/CA-style contention approach often forces the whole channel to remain idle and the early released channel is not utilized. In this paper, we propose Multi-CQ, which is the first software-defined networking (SDN)-based MAC design for wireless LANs that supports SIC and significantly improves the channel utilization. Multi-CQ, adopting SDN's functional separation idea and OFDMA, makes contention and data transmission be executed over two subchannels independently and concurrently, where the superposition coding are used for decoding combined signals, and multiple CQs (contention queues) are introduced to coordinate the concurrency. This concurrent execution greatly reduces the waste in channel contention. Next, adopting SDN's central control idea, Multi-CQ controller selects nodes who can finish their frame transmissions in almost equal time, thereby improving the channel utilization. Finally, we develop a theoretical model to optimize bandwidth allocation for channel contention and data transmission. Extensive simulations verify the effectiveness of our design and the accuracy of our theoretical model. This study is also helpful to better design wireless MAC protocols supporting other advanced functionalities such as MU-MIMO.

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“…Existing studies of SDN-aware protocols mainly consider exploiting SDN for wireless MAC access [9], [10], [11], [12], [13]. However, none of these studies supports SIC transmission.…”

Section: B Sdn-aware Designsmentioning

confidence: 99%

Section: B Sdn-aware Designsmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Successive-Interference-Cancellation- Aware Design for Wireless Networks Using Software-Defined Networking

Zhao

Feng

et al. 2021

IEEE Access

Self Cite

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“…However, it also can be inefficient due to lots of idle contention time slots being wasted, while all nodes get into a contention-free status. In [20], a mechanism carrier sense multiple access/contention queuing (CSMA/CQ) based on software defined network (SDN) is proposed to solve the collision problem, but it needs multiple channels due to its separation of operation in the contention and transmission channel.…”

Section: Related Workmentioning

confidence: 99%

“…In our initial work [13], we propose a decoupling channel access algorithm to overcome this limitation. Similar to the CSMA/CQ proposed in [20], we partition the channel utilization into contention and transmission process. However, unlike CSMA/CQ, our algorithm only operates in one channel, thus it is more flexible to be deployed in many single channel scenarios.…”

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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Decoupling Channel Contention and Data Transmission in Dense Wireless Infrastructure Network

Lei

Yun

2019

Advances in Intelligent Systems and Computing

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CSMA/CQ: A Novel SDN-Based Design to Enable Concurrent Execution of Channel Contention and Data Transmission in IEEE 802.11 Networks

Cited by 10 publications

References 29 publications

A Novel Successive-Interference-Cancellation- Aware Design for Wireless Networks Using Software-Defined Networking

A Novel Successive-Interference-Cancellation- Aware Design for Wireless Networks Using Software-Defined Networking

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

Decoupling Channel Contention and Data Transmission in Dense Wireless Infrastructure Network

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