Abstract-With the introduction of Digital TerrestrialTelevision (DTT) and the analogue television switch-off, terrestrial broadcast spectrum in the UHF band is being released for mobile communications, in particular for fourth generation (4G) Long Term Evolution (LTE) mobile services. This spectrum is known as digital dividend. An impending problem when deploying 4G LTE mobile networks in the digital dividend bands is that interferences may appear in the adjacent radio frequency channels used for DTT. In this paper, we analyze the adjacent coexistence of DTT and 4G LTE networks in the digital dividend bands at 700 MHz and 800 MHz. A generic framework is adopted such that results can be easily extrapolated to different scenarios and bands. Results are presented as a function of the guard band between technologies, for both LTE uplink and downlink adjacent to the DTT signals, and for fixed outdoor and portable indoor DTT reception. Also, the effect of using anti-LTE filters is studied.
Abstract-In the near future, many applications such as environmental sensors, smart objects, health sensors and personal devices will be connected to mobile networks requiring additional spectrum. Studies have been made to demonstrate a low occupancy time and locations on the DTT band. This available or unused spectrum have been called "TV-WhiteSpaces". In the 2015 World Radiocommunication Conference, the ITU decided to re-allocate the 700 MHz band (694-790 MHz) for IMT services and also emplaced the discussion of the future use of the DTT band (470-694 MHz) to 2025, for which studies have been requested.In this paper we study a particular case which goes a step beyond the previous ones, as it aims at sharing the same frequency band in the same area between Long Term EvolutionAdvance (LTE-A) and Digital Video Broadcasting -Terrestrial Second generation (DVB-T2) technologies. Those geographical areas that are not covered because the useful DTT signal is obstructed by the environment or it has a limited coverage by the network design can be called "micro-TVWS" (µTVWS). We assume that a DVB-T2 transmitter provides coverage for fixed rooftop reception as a primary service, to a building in which a LTE-A femtocell is installed indoors for local coverage, as a secondary service. The results have been obtained by laboratory emulation and validated through field measurements using professional equipment. Our results provide the technical restrictions of the LTE-A Femtocell, mainly on the maximum allowable Effective Isotropic Radiated Power (EIRP) that could transmit on the DTT band in terms of carrier separation, from co-channel to adjacent band. These results meet the need of spectrum for IMT-Advanced technologies, so spectrum sharing is proposed in this paper as a new solution to make an efficient use of this resource.Index Terms-DVB-T2, LTE-A Femtocell, White Space, Spectrum Sharing, Digital Terrestrial Television, IMT-Advance Technologies. I. INTRODUCTIONhe increasing demand of applications and scenarios that converge on the massive use of mobile communications has led to a need for additional spectrum allocation. New applications such as environmental sensors, smart objects, Manuscript received December 22, 2015; reviewed May 6, 2016; accepted June 7, 2016. This work was supported by the Ministerio de Educación y Ciencia, Spain, ("DEFINE5G" TEC2014-60258-C2-1-R and "ARCO5G" TEC2014-56469-REDT), by the European FEDER funds. health sensors and personal devices will be connected through mobile devices, so an exponential increase in data traffic accessing mobile radio links is expected. The majority of reports published on actual mobile traffic profiles claim that about 50% of voice calls and 70% of the data traffic is generated in indoor scenarios [1]. Cisco Visual Networking Index (VNI) considered that global mobile data traffic will be multiplied by 10 in the next five years, reaching 30. Since radio spectrum is a natural, scarce and highly demanded resource for the use of wide range wireless technologies, governme...
La televisión digital terrestre, brinda mayor robustez a la señal frente a ruido e interferencias. Además, permite la transmisión de varios canales de televisión por un mismo canal radioeléctrico y optimiza el uso del espectro radioeléctrico mediante el uso de redes de frecuencia única. Sin embargo, en Ecuador no se está utilizando una de las principales ventajas de las redes de TDT, la posibilidad de usar redes de frecuencia única. Lo que conlleva un uso no óptimo del espectro radioeléctrico. En este artículo, en primer lugar, se presenta el modo de transmisión más adecuado para Ecuador en función de su extensión y topografía. Además, se propone una planificación de frecuencias para Ecuador utilizando redes de frecuencia única basado en algoritmos de planificación de coloreado secuencial, optimizando así el uso del espectro radioeléctrico. Finalmente, se presentan ejercicios de planificación de una red real del canal de televisión Ecuador TV, el cual cuenta con 96 transmisores en todo el país, con el cual se comprueba tanto cobertura como interferencias para la planificación propuesta.
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