18 research outputs found

    The outlook on white space utilization policy in Korea: Lessons from the DTV leading countries, namely, the US, the UK, and Japan

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    Some countries have already finished or are progressing toward a transition to Digital Television (DTV). In particular, the US and UK have conducted technical analyses of white space, and its management strategy is under review. They are also working on determining what kind of service could be used for white space. According to this trend, a special research team led by the Japanese government was formed to study DTV white spaces utilization, and its study was conducted at the end of July 2010 [1]. In Korea, a study was recently begun on Cognitive Radio (CR) that could be applied for white spaces. However, no official research is being conducted to quantify the available spaces and their management strategy depending on the service applications. In this paper, we propose an appropriate spectrum management scheme for white space in Korea considering the results of a survey, Spectrum Requirement According to DTV Transition, and an iconography review based on tentatively assigned DTV channels around three DTV pilot test areas, Uljin, Danyang, and Gangjin. --White space,DTV transition,Spectrum policy,Spectrum demand survey,Iconography review,Spectrum management

    Mobile Communication Networks and Digital Television Broadcasting Systems in the Same Frequency Bands – Advanced Co-Existence Scenarios

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    The increasing demand for wireless multimedia services provided by modern communication systems with stable services is a key feature of advanced markets. On the other hand, these systems can many times operate in a neighboring or in the same frequency bands. Therefore, numerous unwanted co-existence scenarios can occur. The aim of this paper is to summarize our results which were achieved during exploration and measurement of the co-existences between still used and upcoming mobile networks (from GSM to LTE) and digital terrestrial television broadcasting (DVB) systems. For all of these measurements and their evaluation universal measurement testbed has been proposed and used. Results presented in this paper are a significant part of our activities in work package WP5 in the ENIAC JU project “Agile RF Transceivers and Front-Ends for Future Smart Multi-Standard Communications Applications (ARTEMOS)”

    Recent Trends on TV White Space Deployments in Africa

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    In this paper, we presented the effects of Television White Space (TVWS) on digital divide in Africa. The trends in digital divide are found to be wide in most African countries, which are characterized with low internet penetration. Perhaps this is expected because over 60 % of people in Africa reside in the rural area and these areas are characterized with low literacy, poverty level and limited telecommunication infrastructure supports. There have been research efforts and regulations towards the secondary use of TV frequencies. However, findings indicate that there are limited opportunities for such system in Europe: This is due to high internet penetration in Europe, but the situation may be quite different in other part of the world like in Africa. Therefore, the TVWS could be used to provide affordable universal access in rural Africa. The paper also presents some benefits developing countries in Africa will incur from utilizing the TVWS solution. Also, recent trend in the deployment of TVWS and experiences got from African countries that embrace the solution are presented.http://dx.doi.org/10.4314/njt.v34i3.1

    Opportunistic Spectrum Access in LTE-Advanced networks

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    [ES] Esta tesina tiene como objetivo investigar, estudiar y desarrollar una soluciĂłn para el acceso oportunista al espectro no licenciado en sistemas LTE. La soluciĂłn propuesta apusta por la implementaciĂłn de un coordinador que decida, dada la ubicaciĂłn del usuario y el estado de sus interferencias, que recursos no licenciados tiene disponibles.[EN] Long Term Evolution Advanced (LTE-A) has emerged as a promising mobile broadband access technology to cope with the increasing demand of traffic in wireless networks. However, the higher spectral efficiency of LTE-A is not enough without a better management of the scarce and overcrowded electromagnetic spectrum. Cognitive Radio (CR) has been proposed as a feasible solution to the problem of spectrum scarcity. Among all the mechanisms provided by CR, the Opportunistic Spectrum Access (OSA) aims at making opportunistic use of certain licensed bands whenever the primary system is not affected. This operation requires spectral awareness in order to avoid interferences with licensed systems. In spite of having some spectrum sensing mechanisms, LTE-A technology lacks other tools that are needed in order to improve the knowledge of the radio environment. In this framework, this Master Thesis studies the implementation of a Geo-located Data Base (Geo-DB) that collects the location of free pieces of spectrum available for OSA, based on a cooperative channel-state declaration. Moreover, the potential benefit of this LTE-compliant OSA solution is evaluated using a calibrated simulation tool. The results allow us to optimally configure the system and show that the proposed opportunistic system is able to significantly improve its performance with the available bandwidth.Herranz Claveras, C. (2012). Opportunistic Spectrum Access in LTE-Advanced networks. http://hdl.handle.net/10251/27271.Archivo delegad

    D21.3 Analysis of initial results at EuWIN@CTTC

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    Deliverable D21.3 del projecte europeu NEWCOM#The nature of this Deliverable of WP2.1 (“Radio interfaces for next-generation wireless systems”) is mainly descriptive and its purpose is to provide a report on the status of the different Joint Research Activities (JRAs) currently ongoing, some of them being performed on the facilities that are available at EuWInPeer ReviewedPreprin

    Implementing opportunistic spectrum access in LTE-Advanced

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    Long term evolution advanced (LTE-A) has emerged as a promising mobile broadband access technology aiming to cope with the increasing traffic demand in wireless networks. However, the enhanced spectral efficiency offered by LTE-A may become futile without a better management of scarce and overcrowded electromagnetic spectrum. In this sense, cognitive radio (CR) has been proposed as a potential solution to the problem of spectrum scarcity. Among all the mechanisms provided by CR, opportunistic spectrum access (OSA) aims at a dynamic and seamless use of certain licensed bands provided the licensee is not harmfully affected. This operation requires spectral awareness in order to avoid interferences with licensed systems. In spite of implementing some spectrum sensing mechanisms, LTE-A technology lacks other tools that are needed in order to improve the knowledge of the radio environment. This work studies the adoption of a Geo-located data base (Geo-DB) that cooperatively retrieves and maintains information regarding the location of unutilized portions of spectrum potentially available for OSA. Moreover, the potential benefit of this LTE-compliant OSA solution is evaluated using a calibrated simulation tool, by which numerical results allow us to optimally configure the system and show that the proposed opportunistic system is able to significantly improve its performance.The authors would like to thank the funding received from the Ministerio de Ciencia e Innovacion within the Project number TEC2011-27723-C02-02 and from the Ministerio de Industria, Turismo y Comercio TSI-020100-2011-266 funds. This article had been written in the framework of the CELTIC project CP08-001 COMMUNE. Study by X. Gelabert is funded by the BP-DGR 2010 scholarship (ref. 00192). The authors would like to acknowledge the contributions of their colleagues.Osa Ginés, V.; Herranz Claveras, C.; Monserrat Del Río, JF.; Gelabert, X. (2012). Implementing opportunistic spectrum access in LTE-Advanced. EURASIP Journal on Wireless Communications and Networking. 2012(99):1-17. https://doi.org/10.1186/1687-1499-2012-99S117201299Martín-Sacristán D, Monserrat JF, Cabrejas-Peñuelas J, Calabuig D, Garrigas S, Cardona N: On the way towards fourth-generation mobile: 3GPP LTE and LTE-Advanced. EURASIP J Wirel Commun Netw 2009, 2009: 1-10.Ratasuk R, Tolli D, Ghosh A: Carrier aggregation in LTE-Advanced. In IEEE 71st Vehicular Technology Conference (VTC 2010-Spring). Taipei; 2010:1-5.Wang H, Rosa C, Pedersen K: Performance of uplink carrier aggregation in LTE-advanced systems. In IEEE 72nd Vehicular Technology Conference Fall (VTC 2010-Fall). Ottawa; 2010:1-5.Tandra R, Sahai A, Mishra S: What is a spectrum hole and what does it take to recognize one? 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    Who runs the radio commons? The role of strategic associations in governing transnational common pool resources

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    This thesis investigates how collective action is achieved in the governance of transnational common pool resources, taking the example of the electromagnetic radio spectrum as a global common. The thesis asks what determines variation in operational and collective choice property arrangements in common pool resources such as the radio spectrum. The radio spectrum represents the totality of radio frequencies used for wireless communications around the world. It is a transnational resource that exhibits properties of other common pool resources: a) high rivalry in consumption and b) difficulty in excluding non-contributing beneficiaries from its use. This study demonstrates that the presence of a public actor – even one with established authority at transnational level such as the Commission of the European Union – cannot fully explain variations in the configuration of property arrangements in the radio resource. Instead, this study finds that private actors in the electronic communications industry – i.e. service operators and system developers – define rules of access and rules of use in the transnational radio resource, by means of negotiating the configuration of technology systems used to extract value from the resource. In addition, this study finds that industry actors are able to define common operational rules to access and use a transnational frequency pool even in complex situations of heterogeneous economic interests and heterogeneous technology capabilities. They reduce uncertainty in these complex situations by increasing participation in decision-making and by developing mechanisms of information exchange and mutual monitoring in industry associations. When industry actors agree these common rules of management, and reinforce them with common rules of exclusion, they are more likely to negotiate operational arrangements based on principles of common exclusive property rather than individual exclusive property in the transnational radio resource. These findings are derived from the analysis of four case studies, which trace the development of operational rules in five radio frequency bands across time. By revealing the central role of industry associations in defining property arrangements in transnational commons such as the radio spectrum, this research seeks to contribute to the debate about the nature and scope of private transnational governance of common goods
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