Virtual Duplex: Scaling Dense WLANS and Eliminating Contention Asymmetry

Flores, Adriana B.; Knightly, Edward W.

doi:10.1109/icnp.2014.96

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Ezchannel [19] allocates different sub-channels to potential hidden and exposed terminals, in order mitigate the negative effect of hidden and exposed terminals and therefore improve spectral efficiency. Virtual Duplex [20] divides a channel into two sub-bands and allocates downlink and uplink traffic to each sub-band. The bandwidths of the a b Fig.…”

Section: Related Workmentioning

confidence: 99%

N-DCF: MAC overhead reduction using narrow channel contention in wireless networks

Eliab

2018

J Wireless Com Network

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This paper presents a medium access control protocol for wireless networks that improves system spectral efficiency using multiple channels. Use of multiple narrow channels has already been proposed as a solution to reduce MAC overhead, but merely dividing a wide channel into narrow channels cannot mitigate the negative effect of packet collisions especially when the network is densely populated. The proposed protocol, called N-DCF, adds protocol support to reduce packet collisions and improve channel utilization. The main idea is to let each node contend on one of the multiple channels and give the node privilege to access other channels when it successfully finishes transmission on its contention channel. When a node gains privilege to a channel, it can access the channel without contention. Privilege is gained probabilistically so that other nodes can have chance to win the channel and obtain privilege for other channels as well. N-DCF reduces channel idle time by conducting random backoff only on one of the narrow channels and reduces packet collisions by assigning contention channel randomly. Idle channels are not wasted because nodes can access other channels once the node wins its contention channel. Performance evaluation shows that the proposed scheme achieves higher throughput than 802.11 DCF without harming the fairness, regardless of node density, packet size, and number of radios.

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Section: Related Workmentioning

confidence: 99%

N-DCF: MAC overhead reduction using narrow channel contention in wireless networks

Eliab

2018

J Wireless Com Network

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“…In [77], a wireless architecture for frequency division named virtual duplex is proposed to conduct arbitrary division for spectral band. Virtual duplex divides spectrum resources into two subbands, which are allocated to corresponding download and upload traffic, respectively.…”

Section: Spectral Interference Avoidancementioning

confidence: 99%

“…However, this approach automatically sacrifices wide-band applications' working range and performance. To address the above drawbacks, the mechanism of band management is proposed to build cross technology friendly network through band division and band aggregation [77][78][79]. The band division is to separate the wide shared band into subbands, and band aggregation aims to weave subbands and then later assign combined subbands to wireless devices for specific usage request.…”

Section: Spectral Interference Avoidancementioning

confidence: 99%

A Survey on Spectrum Utilization in Wireless Sensor Networks

2015

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In recent years, the industrial, scientific, and medical (ISM) bands have been intensively shared with unlicensed wireless communications applications such as wireless sensor networks (WSNs). With flourishing popularity of sensor devices and increasing installation of wireless sensor nodes, the cross technology interference (CTI) has become a considerable realworld problem. Because of CTI, wireless devices suffer significant communication dilemma. Moreover, ISM band, as the main communication medium of WSN, should be reasonably utilized in an efficient and effective manner. Extensive approaches have been proposed to explore spectrum utilization in WSN. However, there is no such one, which systematically organizes these works. In this paper, we present a comprehensive survey on spectrum utilization in WSNs. To achieve this goal, We first illustrate the background of WSN and spectrum utilization. Our concern on CTI is then noted. Later we demonstrate the importance of efficient spectrum utilization. Eventually, through classification and summary of recent related works, we provide an essential structure of research in titled field and detailed intellectual merits of published works. Our survey covers more than 80 studies in the scope of spectrum utilization in WSN.

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