Media delivery represents one of the main challenges for future networks which aim to converge Broadcast and Broadband video traffic into a common telecommunication network architecture. Nowadays, contents streamed over Internet are... more
Media delivery represents one of the main challenges for future networks which aim to converge Broadcast and Broadband video traffic into a common telecommunication network architecture. Nowadays, contents streamed over Internet are delivered in two different manners depending on the application: Video on Demand and Live Streaming. For the former, HTTP-based streaming technologies, such as Dynamic Adaptive Streaming over HTTP (MPEG-DASH), are widely employed for unicast and broadcast communications. It also enables Adaptive Rate Control on the client device allowing players to select a representation and bitrate matching the capabilities of the network at any moment. For the latter, MPEGDASH does not provide low latency for Live streaming when compared to a Broadcast service. Secure Reliable Transport (SRT) is proposed by SRT Alliance to overcome such limitations of unicast and broadcast communications. Nevertheless, it misses the adaptation of the content to the available network resources. In this paper, we show an implementation of Adaptive Rate Control for SRT protocol which exploits periodical network reports in order to adapt the content encoding process. The evaluation includes a real deployment of the solution and a comparison with a legacy SRT stream.
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The emerging technologies in the field of telecommunications have evolved into the paradigm of 5G. 5G technology is aimed to become sufficiently flexible to handle a wide variety of network services from various domains. One of the... more
The emerging technologies in the field of telecommunications have evolved into the paradigm of 5G. 5G technology is aimed to become sufficiently flexible to handle a wide variety of network services from various domains. One of the aspects envisaged by 5G is the virtualization of small cells, which allows enhanced mobile edge computing capabilities, thus enabling network service deployment and management near the end user. This paper presents a cloud-enabled small cell architecture and its corresponding use case for multimedia delivery over 5G networks developed within the 5G- ESSENCE project. Furthermore, it examines the inclusion at the edge of a proactive telemetry framework, as well as of an edge enabled eMBMS service to support 360 multimedia broadcasting in 5G networks.
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FeMBMS is the first broadcast only profile standardized in 3GPP. Re1-14 enables large scale transmission of multimedia content to mobile portable devices including free to air reception of TV services. While the new specification already... more
FeMBMS is the first broadcast only profile standardized in 3GPP. Re1-14 enables large scale transmission of multimedia content to mobile portable devices including free to air reception of TV services. While the new specification already meets most of the 5G-Broadcast requirements it is also expected to be further evolved in future 5G/3GPP releases. Moreover, in parallel to 5G standardization, a transition in the Radio Access Network (RAN) infrastructure is also taking place, transition where the virtualization of radio access technologies through the use of commodity processing hardware promises to make an end-to-end cloud based 5G network infrastructure a reality. In this paper we investigate first the potential of vRAN based 5GBroadcast networks. Later, based on OpenAirInterface and the containerization of its components, we introduce the development and analysis of a Kubernetes based FeMBMS end-to-end network architecture. The results address, among others, the potential of vRAN to foster the broadcast industry requirements in a 3GPP ecosystem.
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Auf der Basis von Edgeund Fog Computing Technologien wird von einem interdisziplinären Entwicklerteam im Rahmen des Forschungsprojekts INVIA ein neuartiges, cloudbasiertes Assistenzsystem für Training, Diagnose und Service an High-Tech... more
Auf der Basis von Edgeund Fog Computing Technologien wird von einem interdisziplinären Entwicklerteam im Rahmen des Forschungsprojekts INVIA ein neuartiges, cloudbasiertes Assistenzsystem für Training, Diagnose und Service an High-Tech Landmaschinen erforscht, konzipiert und prototypisch umgesetzt. Die Basis bilden verbreitete, möglichst offene Standards, Entwicklungsund Systemumgebungen. Dabei soll das Assistenzsystem in Bereichen mit sehr unterschiedlicher Mobilfunkbandabdeckung und verschiedenen Endgeräten betrieben werden. Somit muss es derart adaptiv gestaltet sein, dass Fahrer und Servicetechniker den größtmöglichen Nutzen daraus ziehen können. Die Architektur des realisierten Systems und die ersten Ergebnisse der Einsatzerprobungen bei einem der beteiligten Landmaschinenhersteller werden im Folgenden beschrieben.
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In practical unlicensed communications in TV band, radio devices have to identify, at first, the transmission opportunities, that is, the portion of the spectrum licensed for broadcasting services unoccupied in a certain region at certain... more
In practical unlicensed communications in TV band, radio devices have to identify, at first, the transmission opportunities, that is, the portion of the spectrum licensed for broadcasting services unoccupied in a certain region at certain time, that is, the so-called TV white space. In this paper the outcome of field measurements in the UHF TV band (470–860 MHz) conducted in EU is presented. To obtain empirical values for the parameters upon which unlicensed radio devices are able to distinguish in a real scenario between empty and occupied TV channels, signal power measurements have been performed in Italy, Spain, and Romania on rural, suburban, and urban sites, at different heights over the ground by using different analysis bandwidths. The aim of this work is to provide a set of practical parameters upon which harmless unlicensed communication in the UHF TV white space is feasible. The results have been analyzed with respect to the hidden node margin problem, spectrum sensing ban...
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ABSTRACT This paper focuses on the potential enhancements of the DVB-T2 standard by the use of newly designed Two-Dimensional Non-Uniform Constellations (2D-NUQAM). In this work, a complete analysis of the DVB-T2 system performance when... more
ABSTRACT This paper focuses on the potential enhancements of the DVB-T2 standard by the use of newly designed Two-Dimensional Non-Uniform Constellations (2D-NUQAM). In this work, a complete analysis of the DVB-T2 system performance when using the proposed 2D-NUQAM constellations against regular uniform (M-QAM) is presented. Based on the optimization of the Bit-interleaved Coded Modulation (BICM) capacity, the designed constellations provide a potential performance improvement of 1.05 dB for the overall DVB-T2 system performance in high order constellations. All carried out analyses are based on a complete DVB-T2 system specification simulation where equivalent 64-QAM and 256-QAM constellation and all baseline code rates have been evaluated.
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This paper presents the study of the spectrum occupancy in the UHF frequency band (470-870MHz) in Bilbao area, Spain. The study has been performed at three different sites and at different height to determinate the hidden node margin, the... more
This paper presents the study of the spectrum occupancy in the UHF frequency band (470-870MHz) in Bilbao area, Spain. The study has been performed at three different sites and at different height to determinate the hidden node margin, the main problem of the cognitive radio. The objective of the paper is to determinate by signal power measuring if the cognitive device will be able to detect and distinguish the empty and occupied channel to carry out the communication. The results from the spectrum measurements taken in all the sites have been analyzed and compared to the official spectrum regulation. The study reveals that the spectrum occupancy is minimum, thus there are a lot of white spaces in this band.
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... javi@bips78.bi.ehu.es amaia.arrinda@ehu.es c.fernandez.alonso@dominion.es gorka.prieto@ehu.es manuel.velez@ehu.es Abstract-This paper describes the main characteristics of the TETRA network installed at the BILBAO METRO. ...
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This paper describes the results of the project “Integration of Broadcast and Broadband in LTE/5G” (IMB5). The IMB5 project explores the LTE-broadcast mode eMBMS within two detailed single-frequency-network (SFN) field trial networks in... more
This paper describes the results of the project “Integration of Broadcast and Broadband in LTE/5G” (IMB5). The IMB5 project explores the LTE-broadcast mode eMBMS within two detailed single-frequency-network (SFN) field trial networks in Erlangen and Munich, Germany and identifies potential improvements of the current broadcasting feature within LTE towards future releases of 4G and 5G. On the User Equipment (UE) side, terminals from Qualcomm and Samsung based on commercial chipsets have been used mainly for application layer tests. For detailed physical layer tests, two different LTE software-defined-radio platforms (one based on the OpenAirInterface framework and one from National Instruments) have been set up to support detailed field experiments with the existing and future extended eMBMS beyond the state-of-the-art in LTE release 12. On the application layer, it is shown in the project, that using LTE eMBMS, a flexible service mix of unicast mobile broadband and broadcast linear TV can be delivered. For country-wide deployment of eMBMS SFNs, physical layer waveform modifications like an increased cyclic prefix compared to the current LTE standard are recommended.
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ABSTRACT DVB-T2 is the second generation terrestrial broadcast system developed within the DVB consortium. Based on multi-carrier transmission OFDM, DVB-T2 introduces many innovative tools offering high flexibility to broadcasters. Among... more
ABSTRACT DVB-T2 is the second generation terrestrial broadcast system developed within the DVB consortium. Based on multi-carrier transmission OFDM, DVB-T2 introduces many innovative tools offering high flexibility to broadcasters. Among many other new techniques DVB-T2 defines an optional Time-Frequency-Slicing (TFS) profile. In TFS slices of a PLP are sent over multiple and non necessarily adjacent RF frequency channels. This technique provides a gain associated to propagation diversity, as well as an intrinsic multiplexation gain. Following a software defined radio approach this paper presents a flexible DVB-T2 Time Frequency Slicing evaluation framework built to study the practical performance of DVB-T2 Time Frequency Slicing configurations under realistic channel scenarios. The paper focuses on the diversity gain associated to propagation diversity.
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In the last years, the migration from analog to digital terrestrial television systems has favored the deployment of Single Frequency Networks (SFN), more efficient from a spectrum point of view, to provide DVB-T services in larger... more
In the last years, the migration from analog to digital terrestrial television systems has favored the deployment of Single Frequency Networks (SFN), more efficient from a spectrum point of view, to provide DVB-T services in larger geographical areas through the reuse of frequencies. However, the planning of a SFN is not a trivial task, since the designer must find a
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... Alda. Urkijo s/n, 48013 Bilbao, Spain, e-mail: inaki.eizmendi@ehu.es, tel.: +34 94 601 7303, fax: +34 94 601 4259. ... Alda. Urkijo s/n, 48013 Bilbao, Spain, e-mail: gorka.prieto@ehu.es, tel.: +34 94 601 3994, fax: +34 94 601 4259. ...
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ABSTRACT In DVB-T2 broadcast networks, the Single Frequency Network (SFN) mode is an attractive alternative to the well-known Multiple Frequency Network (MFN) mode. SFN networks provide augmented spectrum efficiency as well as a quality... more
ABSTRACT In DVB-T2 broadcast networks, the Single Frequency Network (SFN) mode is an attractive alternative to the well-known Multiple Frequency Network (MFN) mode. SFN networks provide augmented spectrum efficiency as well as a quality of service improvement due to the more homogeneous distribution of the received signal strength. Nevertheless, in practice, some areas will also show a degradation caused by long SFN echoes. In order to improve the performance under harsh SFN receiving conditions, the DVB-T2 standard incorporates a Multiple Input Single Output (MISO) antenna diversity mechanism. The aim of this paper is to analyze the practical performance of DVB-T2 receivers under realistic SFN channel conditions. A software based DVB-T2 receiver implementation is used as a reference, providing performance results for both SISO and MISO configurations in a set of proposed SFN scenarios.
ABSTRACT This paper presents a novel methodology to characterize the DVB-T2 MISO vs SISO performance using field test measurements. The proposed methodology uses general purpose digital vector signal analyzers to record the required... more
ABSTRACT This paper presents a novel methodology to characterize the DVB-T2 MISO vs SISO performance using field test measurements. The proposed methodology uses general purpose digital vector signal analyzers to record the required DVB-T2 MISO/SISO IQ (In-phase and in-quadrature) signals in the coverage area to be later processed using a laboratory play out system with a software based custom DVB-T2 receiver and a commercial DVB-T2 receiver.
ABSTRACT An approach that predicts the propagation, models the terrestrial receivers and optimizes the performance of single frequency networks (SFN) for digital video broadcasting in terms of the final coverage achieved over any... more
ABSTRACT An approach that predicts the propagation, models the terrestrial receivers and optimizes the performance of single frequency networks (SFN) for digital video broadcasting in terms of the final coverage achieved over any geographical region, enhancing the most populated areas, is proposed in this paper. The effective coverage improvement and thus, the self-interference reduction in the SFN is accomplished by optimizing the internal static delays, sector antenna gain, and both azimuth and elevation orientation for every transmitter within the network using the heuristic simulated annealing (SA) algorithm. Decimation and elevation filtering techniques have been considered and applied to reduce the computational cost of the SA-based approach, including results that demonstrate the improvements achieved. Further representative results for two SFN in different scenarios considering the effect on the final coverage of optimizing any of the transmitter parameters previously outlined or a combination of some of them are reported and discussed in order to show both, the performance of the method and how increasing gradually the complexity of the model for the transmitters leads to more realistic and accurate results.