The End of Spectrum Scarcity

Staple, Gregory C.; Werbach, Kevin

doi:10.1109/mspec.2004.1270548

Cited by 357 publications

(164 citation statements)

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“…Such contention can be resolved using a suitable medium access control (MAC) protocol. Thus, the maximum transmission duty cycle of an FAR node on a given channel is given by (2) where t off is the average duration in the off state. Clearly, the amount of interference caused to the victim nodes by an FAR node performing LBT depends on the values of the key parameters h, t on , and the MIFTP s*.…”

Section: Individual Lbtmentioning

confidence: 99%

“…Under the above two assumptions, the duty cycle of the FAR node executing LBT is given by [2] d P E P a a…”

Section: Interference Probability and Distancementioning

confidence: 99%

“…Recent studies [1,2] suggest that significant portions of the wireless spectrum are highly underutilized. An open research question is whether such 'spectrum holes' can be exploited without causing harmful interference to the primary users, i.e., transmitters and receivers, of the allocated wireless spectrum.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and analysis of interference in Listen‐Before‐Talk spectrum access schemes

Leu¹,

McHenry²,

Mark³

2006

Int J Network Mgmt

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SUMMARYSpectrum measurement studies have shown that substantial portions of the allocated wireless spectrum are highly underutilized. Frequency-agile radios (FARs) have the potential to make opportunistic use of such spectrum holes without causing harmful interference to users of the allocated spectrum. Toward this goal, we develop a framework for modeling the interference caused by FARs employing spectrum access mechanisms based on the simple ListenBefore-Talk (LBT) scheme. Two variations of LBT are considered: individual LBT, whereby the FARs act independently of each other; and collaborative LBT, whereby the FARs communicate with each other in order to more accurately identify the spectrum holes. Our analysis of the LBT scheme reveals the fundamental interdependencies among key system design metrics and provides a basis for analyzing more complex spectrum access methods. In particular, the analysis of LBT provides a lower bound on the capacity gain achievable by FARs employing spectrum-sharing schemes. Our numerical results show that the individual LBT scheme can provide substantial capacity gains, while even more gain can be achieved using the collaborative LBT schemes. Our analysis suggests that much greater gains should be achievable via spectrum access schemes that incorporate location information and/or more sophisticated group behaviors.

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Section: Individual Lbtmentioning

confidence: 99%

“…Under the above two assumptions, the duty cycle of the FAR node executing LBT is given by [2] d P E P a a…”

Section: Interference Probability and Distancementioning

confidence: 99%

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Modeling and analysis of interference in Listen‐Before‐Talk spectrum access schemes

Leu¹,

McHenry²,

Mark³

2006

Int J Network Mgmt

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“…However, this is being threatened by spectrum scarcity. This is as a result of the present static spectrum allocation and the fixed pricing mechanism that is presently adopted leading to congestion on the radio spectrum [1,2]. The static spectrum allocation does not allow for the same spectrum band to be shared among different service providers while users are usually locked into a long-term contract.…”

Section: Introductionmentioning

confidence: 99%

Energy Efficient Short Term Spectrum Auction Using the Concept of Green Payments

Oloyede

Grace

2016

Wireless Pers Commun

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This work seeks to demonstrate the economic importance of short-term spectrum auction and how it can be implemented with fewer overheads. This can be achieved using the proposed market driven sealed bid spectrum auction process with a novel concept called the green payment. The green payment serves as an incentive during the auction process to encourage the users to use the radio spectrum in an efficient manner. The model proposes to tax users that are not power efficient while those that are power efficient pay a subsidy during the auction process. First, the appropriate bidding and auction periods are examined and determined such that the bidding period is dependent on the traffic load in the system. Using the obtained bidding period, the value of the green payments is then examined and the appropriate level of tax and subsidy are also determined. The economic importance of the model in terms of the revenue generation for the service provider and in terms of the tax being adequate to finance the subsidy is also examined. These results show that using the proposed concept of green payment, the energy consumed and the system delay can be reduced when compared to a non-green payment based auction process. The results also show that the proposed model is beneficial to the service provider in terms of increase in profit and that the tax and subsidy system is self-sustaining.

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“…Spectrum measurement studies have indicated that large portions of the currently allocated spectrum are highly underutilized [1], [2]. Cognitive radios have been proposed as a promising approach to promote the efficient use of the spectrum by exploiting the existence of spectrum holes (i.e., unused spectrum) [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Performance of a cognitive radio network with tolerable service degradation

Tang

Mark

2009

2009 7th International Workshop on Design of Reliable Communication Networks

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Abstract-We analyze the performance of a cognitive radio wireless network, where secondary users opportunistically share the radio spectrum with primary users through spectrum sensing and may cause service degradation to the primary users due to unreliable spectrum sensing. When a secondary user occupying a channel detects the presence of a primary call arriving to the channel, it switches from its current channel to another channel, if one is available, to continue its service; however, if the secondary user fails to detect the presence of the primary call, it remains on the channel and both calls will receive degraded service. Based on a queueing network model, we derive closedform solutions for the equilibrium system state in terms of generating functions, and derive several performance metrics of interest. In particular, we introduce the system supportability metric to evaluate the extent to which the system can support secondary users and the interference factor to evaluate the degree of service degradation imposed on primary users by the secondary users. Numerical results are presented to show the impact of system parameters on the derived performance metrics.

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The End of Spectrum Scarcity

Cited by 357 publications

References 0 publications

Modeling and analysis of interference in Listen‐Before‐Talk spectrum access schemes

Modeling and analysis of interference in Listen‐Before‐Talk spectrum access schemes

Energy Efficient Short Term Spectrum Auction Using the Concept of Green Payments

Performance of a cognitive radio network with tolerable service degradation

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