Enabling coexistence of multiple cognitive networks in TV white space

Villardi, Gabriel Porto; Alemseged, Yohannes D.; Sun, Chen; Sum, Chin-Sean; Nguyen, Tran Ha; Baykaş, Tunçer; Harada, Hiroshi

doi:10.1109/mwc.2011.5999762

Cited by 45 publications

(26 citation statements)

References 3 publications

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“…It was shown in [69] that without the use of coexistence mechanisms, 92% of available spectrum is overlapped by neighboring networks. Based on the proposed architecture [70], the coexistence mechanisms are classified into three groups: centralized, coordinated and autonomous mechanisms.…”

Section: Self-coexistence Decision-making Mechanisms For Cr Network mentioning

confidence: 99%

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A Survey on Coexistence in Heterogeneous Wireless Networks in TV White Spaces

Maloku

Fazliu

Ibrani

2018

Wireless Communications and Mobile Computing

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With the advent of analog to digital transition in TV broadcasting, a substantial amount of spectrum has become available in TV bands. To take advantage of this, the idea for cognitive radios was introduced for two major reasons: better utilization of spectrum in urban areas and facilitation of wireless connectivity in rural areas. To achieve these two goals, however, many challenges have to be addressed first. Considering that these frequencies are commonly licensed, besides primary user detection, a serious challenge remains the detection and identification of other secondary devices and networks. The problems arising from this issue concern the coexistence problems happening from having several primary and secondary networks of different technologies cohabiting the same licensed spectrum simultaneously and from many secondary systems/users coexisting at the same place while using identical or different technologies. In this survey we provide a review of existing works and outline new challenges regarding coexistence and self-coexistence in heterogeneous wireless networks in TV White Spaces including a comparative analysis between selected coexistence mechanisms.

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Section: Self-coexistence Decision-making Mechanisms For Cr Network mentioning

confidence: 99%

“…Then to pass the information to users, internetwork coordination channels are used [69]. However this solution is costly and also ineffective when there are many coexisting devices or even networks that do not want to be part of a centralized control system.…”

Section: Self-coexistence Decision-making Mechanisms For Cr Network mentioning

confidence: 99%

A Survey on Coexistence in Heterogeneous Wireless Networks in TV White Spaces

Maloku

Fazliu

Ibrani

2018

Wireless Communications and Mobile Computing

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“…These diversities may cause coexistence issues, such as an unresolvable interference, spectrum congestion, and diversity in network size, as explained in [6][7][8][9]. To address coexistence issues and regulate access to TV spectrum, IEEE has proposed an 802.19.1 standard [10].…”

Section: Introductionmentioning

confidence: 99%

A Versatile Coexistence Decision-Making System for Efficient TV Whitespace Sharing among Whitespace Objects

Raza

Iqbal

Byun

et al. 2017

Wireless Communications and Mobile Computing

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A coexistence decision-making (CDM) system for efficient TV whitespace (TVWS) sharing among whitespace objects (WSOs) is introduced in this paper. The proposed system is considered versatile in functionality as it jointly takes care of three distinct channel allocation features: (a) optimizing system quality of service (QoS) performance metrics, (b) improving TVWS utility, and (c) satisfying WSO channel demands. Regarding system QoS performance metrics, the TVWS sharing problem is defined as an optimization problem with an aim to maximize the system throughput and minimize unfairness in allocation. Supporting the WSOs channel demands in a TVWS sharing problem is a multifold task which requires elaborate consideration in different aspects of the system performance. To this end, the variations of the SNR of wireless frequency channels which result in variable throughput gain of the WSOs are also taken care of in the proposed CDM system. A fast channel allocation algorithm is then designed that implements the TVWS sharing mechanism in a reasonable amount of time. Additionally, the proposed algorithm improves the TVWS utility by promoting a novel frequency reuse method by exploiting the inter-WSO interference information. Simulation results show the superiority of the proposed algorithm over existing TVWS sharing algorithms.

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“…It has attracted much attention in both the academic and the industry over the last decade [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Channel direction information probing for multi-antenna cognitive radio system

Fang

Villardi

Kojima

et al. 2015

EURASIP J. Adv. Signal Process.

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This work studies the problem of channel direction information (CDI) probing for multi-antenna cognitive radio system. The CDI of the channel from the secondary transmitter (ST) to primary receiver (PR) is elementary information in designing the beamforming at the ST for mitigating the interference to the PR. However, lacking the explicit cooperation between primary and secondary systems, the CDI has to be acquired by probing at the ST, which is challenging. To solve this, we consider the line of sight (LoS) channel between the ST and the PR, and propose one CDI probing scheme for the ST. Specifically, the ST sends two types of probing signals by beamforming towards an interested region where both the secondary receiver (SR) and the PR are located and then actively learns the hidden feedback information from the primary system to acquire the CDI. The proposed scheme has a closed-form solution, and avoids the iteration between the probing and acquisition, which is desirable for practical system. Moreover, we show that the proposed probing scheme can be extended for primary systems working under multi-access channel and broadcasting channel. Simulation results demonstrate that the proposed scheme can improve the accuracy of the acquired CDI at the ST in cognitive ratio system remarkably.

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Enabling coexistence of multiple cognitive networks in TV white space

Cited by 45 publications

References 3 publications

A Survey on Coexistence in Heterogeneous Wireless Networks in TV White Spaces

A Survey on Coexistence in Heterogeneous Wireless Networks in TV White Spaces

A Versatile Coexistence Decision-Making System for Efficient TV Whitespace Sharing among Whitespace Objects

Channel direction information probing for multi-antenna cognitive radio system

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