Digital switchover and regulatory design for competing white space usage rights

Freyens, Benoit; Loney, Mark

doi:10.1109/dyspan.2011.5936222

Cited by 15 publications

(5 citation statements)

References 8 publications

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“…Three reasons are crucial for the existence of this spectral opportunity [1]: 1) In the same licensed area and thanks to improved signal characteristics, DVB-T services need a reduced amount of guard intervals respect to analog TV adiacent transmissions; 2) Given different licensed areas, TV services broadcasting on the same channel need to be geographically separated; 3) In areas where there is a limited demand of broadcasting services, some TV channels are not allocated yet. The TVWS usage by the so-called White Space Devices (WSDs) requires, first of all, an adequate protection of licensed systems; for this reason, regulation activities are presently ongoing in US (by FCC [2]), UK (by Ofcom [3]) and Europe (by CEPT [4]).…”

Section: A Tv White Spaces and Cognitive Radio Networkingmentioning

confidence: 99%

Cognitive indoor positioning in TV White Spaces

Caso

Nardis

Ferrante

et al. 2013

International Conference on Indoor Positioning and Indoor Navigation

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Recent evolution in regulation of access to TV channels allocated in UHF frequencies (DVB-T) makes vacant channels (TV White Spaces -TVWS) available to wireless data services. While this opportunity is currently widely studied by the cognitive radio community for communications, the use of TVWS for indoor positioning is all but unexplored. Frequencies below 900 MHz are extremely appealing for positioning due to a more uniform signal propagation with respect to the ISM bands and a lower attenuation when passing through obstacles. This work focuses indeed on indoor positioning in the TVWS. A TVWS positioning system is proposed and compared against WiFi-based solutions, in terms of energy efficiency, operating range, and impact of network topology. Moreover, the formulation of a cognitive paradigm for optimal selection of the topology of Access Points and of network topology in a TVWS communication and positioning system is given. The proposed algorithm takes into account constraints related to positioning accuracy and communication performance. Results obtained analytically and by simulation show that favorable propagation conditions characterizing the TVWS frequencies, in conjunction with an optimized system organization and topology, lead to highly accurate positioning and improved energy efficiency over traditional schemes, thanks to lower transmit power levels. The proposed solution is therefore also appealing in light of recent trends towards green wireless communications.

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Section: A Tv White Spaces and Cognitive Radio Networkingmentioning

confidence: 99%

Cognitive indoor positioning in TV White Spaces

Caso

Nardis

Ferrante

et al. 2013

International Conference on Indoor Positioning and Indoor Navigation

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“…Consequently, TVWS spectrum availability after DSO is expected to experience an increase between 30% and 82%. This definitely leads to a more unutilised band, because digital transmission customarily requires a fraction of the spectrum band as compared to the analogy transmission . Much research work has been performed to investigate the preferred frequency channel assignment (FCA) for the unlicensed system to increase spectrum utilisation in TV band after DSO .…”

Section: Cognitive Radio and In Malaysiamentioning

confidence: 99%

“…An amount of 48 MHz of the spectrum marked in grey (six channels) will be cleared. This is because the DTV broadcasting is more spectrum efficient and requires fewer spectrums to operate . This will result in clearing the band of 742–790 MHz, referred to as TVWS spectrum, which can be reallocated for other services by the regulators or could be used in an opportunistic manner by CR users.…”

Section: How Much Tv White Space Will Be Available?mentioning

confidence: 99%

A survey of cognitive radio and TV white spaces in Malaysia

Elshafie

Fisal

Abbas

et al. 2014

Trans Emerging Tel Tech

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Cognitive radio (CR) enables spectrum sharing by allowing new unlicensed services from secondary users to operate in pre-allocated bands in an opportunistic manner. TV white space (TVWS) is a portion of the spectrum in ultra-high frequency (UHF) and very-high frequency bands, which is not utilised by primary users in specific time and location. It is envisaged that more spectrum will be available after digital switchover (DSO) TV transmission replaces the current analogue system. Recently, the regulators in the USA and in the UK have given approval for companies to operate new communication systems with the capability of utilising TVWS spectrum. This paper provides a comprehensive overview of the CR technology and quantifies the TVWS status in Malaysia to expose the spectrum reuse opportunities for future secondary user deployment. Taking the 18 major cities in Malaysia into consideration, we find that all seven TV stations utilise from two to seven of the UHF channels. In our analysis, three usage scenarios were considered, where the utilisation of the 40 UHF channels is full, half and a third. For each case, it was discovered that TVWS was 82.5%, 65% and 46.1%, which can be opportunistically utilised by CR users.

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“…For DTT operation, in the USA, extended measurements performed by the Federal Communication Commission (FCC) showed that a large part of the TV radio spectrum, although allocated, was virtually unused [2]: ∼10% of the 67 high‐power TV channels were allocated. Even in Europe, the digital switchover has induced a review of the UHF spectrum usage [3], leaving free TV channels in each territorial area. In the UK modelling, commissioned by the ‘Independent regulator and competition authority for the UK communications industries’ (Ofcom) revealed that over 50% of locations in the United Kingdom have more than 150 MHz available in the bands assigned to DTT [4].…”

Section: Introductionmentioning

confidence: 99%

“…The unused channels within the TV band are called ‘TV white spaces’ (TVWS) [2]. However, since TVWS are not occupied, but still licensed channels, formally assigned to TV broadcasting services, traditional static spectrum allocation policy do not formally allow using them for other services [3].…”

Section: Introductionmentioning

confidence: 99%