Project

5G-Xcast (Broadcast and Multicast Communication Enablers for the Fifth-Generation of Wireless Systems)

Goal: 5G-Xcast is a second phase 5G-PPP Horizon 2020 European project with the following objectives:
• Develop broadcast and multicast point to multipoint (PTM) capabilities for 5G considering Media & Entertainment (M&E), Automotive, Internet-of-Things and Public Warning (PW) use cases.
• Design a dynamically adaptable 5G network architecture with layer independent network interfaces to dynamically and seamlessly switch between unicast, multicast and broadcast modes or use them in parallel and exploit built-in caching capabilities.
• Experimentally demonstrate the 5G key innovation developed in the project for the M&E and PW verticals.
More information: www.5g-xcast.eu
(H2020-ICT-2016-2 call, grant number 761498)

Updates
0 new
0
Recommendations
0 new
0
Followers
0 new
30
Reads
2 new
549

Project log

Menno Bot
added a research item
Method for distributing multimedia public warning alerts in a mobile telecommunications network, comprising the steps of: creating a alert message by an emergency authority computer in said network, said message comprising a textual message and at least one multimedia object, such as a picture, audio or video; sending by a multicast content distributor server in response to said request for a content delivery session parameters for a content delivery session, said parameters comprising a multicast IP address; sending by said emergency authority computer the created alert message to the multicast content distributor server; sending by said emergency authority computer a request for sending a cell broadcast message to a cell broadcast center in said network, said cell broadcast message comprising said textual message and said content delivery session parameters; broadcasting by said cell broadcast center said cell broadcast message through a radio access network in said network; receiving by a plurality of mobile user equipment in said network said cell broadcast message through said radio access network; setting up by the multicast content distributor server a transparent IP multicast session between the multicast content distributor server and at least part of said multitude of user equipment; sending said at least one multimedia object though said transparent IP multicast session to said at least part of said multitude of user equipment.
De Mi
added 2 research items
The first 5G (5th generation wireless systems) New Radio Release-15 was recently completed. However, the specification only considers the use of unicast technologies and the extension to point-to-multipoint (PTM) scenarios is not yet considered. To this end, we first present in this work a technical overview of the state-of-the-art LTE (Long Term Evolution) PTM technology, i.e., eMBMS (evolved Multimedia Broadcast Multicast Services), and investigate the physical layer performance via link-level simulations. Then based on the simulation analysis, we discuss potential improvements for the two current eMBMS solutions, i.e., MBSFN (MBMS over Single Frequency Networks) and SC-PTM (Single-Cell PTM). This work explicitly focus on equipping the current eMBMS solutions with 5G candidate techniques, e.g., multiple antennas and millimeter wave, and its potentials to meet the requirements of next generation PTM transmissions.
The 3rd Generation Partnership Project (3GPP) has defined based on the Long Term Evolution (LTE) enhanced Multicast Broadcast Multimedia Service (eMBMS) a set of new features to support the distribution of Terrestrial Broadcast services in Release 14. On the other hand, a new 5th Generation (5G) system architecture and radio access technology, 5G New Radio (NR), are being standardised from Release 15 onwards, which so far have only focused on unicast connectivity. This may change in Release 17 given a new Work Item set to specify basic Radio Access Network (RAN) functionalities for the provision of multicast/broadcast communications for NR. This work initially excludes some of the functionalities originally supported for Terrestrial Broadcast services under LTE e.g. free to air, receive-only mode, large-area single frequency networks, etc. This paper proposes an enhanced Next Generation RAN architecture based on 3GPP Release 15 with a series of architectural and functional enhancements, to support an efficient, flexible and dynamic selection between unicast and multicast/broadcast transmission modes and also the delivery of Terrestrial Broadcast services. The paper elaborates on the Cloud-RAN based architecture and proposes new concepts such as the RAN Broadcast/Multicast Areas that allows a more flexible deployment in comparison to eMBMS. High-level assessment methodologies including complexity analysis and inspection are used to evaluate the feasibility of the proposed architecture design and compare it with the 3GPP architectural requirements.
De Mi
added 2 research items
This work presents eight demonstrators and one showcase developed within the 5G-Xcast project. They experimentally demonstrate and validate key technical enablers for the future of media delivery, associated with multicast and broadcast communication capabilities in 5th Generation (5G). In 5G-Xcast, three existing testbeds: IRT in Munich (Germany), 5GIC in Surrey (UK), and TUAS in Turku (Finland), have been developed into 5G broadcast and multicast testing networks, which enables us to demonstrate our vision of a converged 5G infrastructure with fixed and mobile accesses and terrestrial broadcast, delivering immersive audio-visual media content. Built upon the improved testing networks, the demonstrators and showcase developed in 5G-Xcast show the impact of the technology developed in the project. Our demonstrations predominantly cover use cases belonging to two verticals: Media & Entertainment and Public Warning, which are future 5G scenarios relevant to multicast and broadcast delivery. In this paper, we present the development of these demonstrators, the showcase, and the testbeds. We also provide key findings from the experiments and demonstrations, which not only validate the technical solutions developed in the project, but also illustrate the potential technical impact of these solutions for broadcasters, content providers, operators, and other industries interested in the future immersive media delivery.
The 3rd Generation Partnership Project (3GPP) has defined based on the Long Term Evolution (LTE) enhanced Multicast Broadcast Multimedia Service (eMBMS) a set of new features to support the distribution of Terrestrial Broadcast services in Release 14. On the other hand, a new 5 th Generation (5G) system architecture and radio access technology, 5G New Radio (NR), are being standardised from Release 15 onwards, which so far have only focused on unicast connectivity. This may change in Release 17 given a new Work Item set to specify basic Radio Access Network (RAN) functionalities for the provision of multicast/broadcast communications for NR. This work initially excludes some of the functionalities originally supported for Terrestrial Broadcast services under LTE e.g. free to air, receive-only mode, large-area single frequency networks, etc. This paper proposes an enhanced Next Generation RAN architecture based on 3GPP Release 15 with a series of architectural and functional enhancements, to support an efficient, flexible and dynamic selection between unicast and multicast/broadcast transmission modes and also the delivery of Terrestrial Broadcast services. The paper elaborates on the Cloud-RAN based architecture and proposes new concepts such as the RAN Broadcast/Multicast Areas that allows a more flexible deployment in comparison to eMBMS. High-level assessment methodologies including complexity analysis and inspection are used to evaluate the feasibility of the proposed architecture design and compare it with the 3GPP architectural requirements.
Jordi J. Gimenez
added a research item
This work presents a potential solution for enabling the use of multicast in the 5G New Radio Release 17, called 5G NR Mixed Mode. The proposed multicast/broadcast mode follows one of the two approaches envisaged in 3GPP, which enables a dynamic and seamless switching between unicast and multicast, both in the downlink and the uplink. This paper also provides a performance evaluation of several IMT-2020 KPIs, including available data rate and spectral efficiency, user and control plane latencies, energy efficiency, and mobility, highlighting the potential advantages of this solution over unicast in relevant scenarios. Finally, other multipoint-based KPIs such as coverage or packet loss rate are also evaluated by means of system level simulations.
De Mi
added a research item
This work presents eight demonstrators and one showcase developed within the 5G-Xcast project. They experimentally demonstrate and validate key technical enablers for the future of media delivery, associated with multicast and broadcast communication capabilities in 5th Generation (5G). In 5G-Xcast, three existing testbeds: IRT in Munich (Germany), 5GIC in Surrey (UK), and TUAS in Turku (Finland), have been developed into 5G broadcast and multicast testing networks, which enables us to demonstrate our vision of a converged 5G infrastructure with fixed and mobile accesses and terrestrial broadcast, delivering immersive audio-visual media content. Built upon the improved testing networks, the demonstrators and showcase developed in 5G-Xcast show the impact of the technology developed in the project. Our demonstrations predominantly cover use cases belonging to two verticals: Media & Entertainment and Public Warning, which are future 5G scenarios relevant to multicast and broadcast delivery. In this paper, we present the development of these demonstrators, the showcase, and the testbeds. We also provide key findings from the experiments and demonstrations, which not only validate the technical solutions developed in the project, but also illustrate the potential technical impact of these solutions for broadcasters, content providers, operators, and other industries interested in the future immersive media delivery.
David Gomez-Barquero
added a research item
The provision of Terrestrial Broadcast services using 3GPP technologies was enabled for the first time in LTE Advanced Pro Release (Rel-) 14, in which the evolved Multimedia Broadcast Multicast Service (eMBMS) technology was enhanced to fulfill a wide set of requirements input by the broadcast industry. During the Enhancements for Television (EnTV) work item in Rel-14 several modifications were realized affecting system architecture, core and radio access. Among others, an interface to grant control to broadcasters to establish audiovisual services, an Application Programming Interface for developers to simplify access to eMBMS procedures, or a transparent delivery mode with native content formats. At the radio layer dedicated carriers with 100% broadcast content allocation were enabled, and also new OFDM numerologies to support larger inter-site distances in Single Frequency Networks (SFN). The most significant change was the so-called receive-only mode which enables devices receiving broadcast content with no need for uplink capabilities, SIM cards or network subscriptions, i.e. free-to-air reception. In Rel-16 3GPP carried out a study item to evaluate EnTV Rel-14 against the terrestrial broadcast requirements for 5G defined in 3GPP TR 38.913. Two requirements were detected as not met: the ability to support SFN with cell radii of up to 100 km, and mobile reception with speeds up to 250 km/h. A Rel-16 Work Item standardized further improvements while taking into account practical considerations such as implementation complexity and performance. The improved system is known as LTE-based 5G Terrestrial Broadcast, and also with the popular name 5G Broadcast.
De Mi
added a research item
In this article, we investigate a resource allocation problem for multicarrier multiuser MISO (multiple-input-Single-output) downlink systems, where multiple co-channel multicast groups are served simultaneously. We consider a rate-splitting transmission scheme to address the inevitable inter-group interference under an overloaded multigroup multicast scenario, where the insufficient number of transmit antennas prevents the conventional schemes from neutralizing the interference. We first formulate an optimization problem for maximizing the minimum multicast group rate among all groups on all available subcarriers. This problem involves a joint power and subcarrier allocation optimization, and is non-convex. We apply an iterative scheme based on successive convex approximation (SCA) to find the locally optimal solution. Simulation results demonstrate the performance gain of the proposed scheme compared to the state-of-the-art transmission schemes.
Menno Bot
added a research item
PWS in LTE and 5GS only supports text-based warning using Cell Broadcast technology. PWS with multimedia warning message delivery is not specified. The present document analyses requirements that need to be fulfilled to support multimedia warning message delivery in the 5GS within the boundaries of the 5G-Xcast project.
Carlos Barjau
added a research item
The first release of 5th Generation (5G) technology from 3rd Generation Project Partnership (3GPP) Rel’15 has been completed in December 2018. An open issue with this release of standards is that it only supports unicast communications in the core network and Point-To-Point (PTP) transmissions in the Radio Access Network (RAN), and does not support multicast/broadcast communications and Point-To-Multipoint (PTM) transmissions, which are 3GPP system requirements for 5G applications in a number of vertical sectors, such as Automotive, Airborne Communications, Internet-of-Things, Media & Entertainment, and Public Warning & Safety systems. In this article, we present novel mechanisms for enhancing the 5G unicast architecture with minimal footprint, to enable efficient PTM transmissions in the RAN, and to support multicast communications in the Rel’15 core as an in-built delivery optimization feature of the system. This approach will enable completely new levels of network management and delivery cost-efficiency.
Eduardo Garro
added a research item
This report investigates the 3GPP Release'15 (Rel'15) of 5G New Radio (NR), and extends the air interface to point-to-multipoint (PTM) communications. Two modes have been proposed in order to fulfil the different 3GPP requirements needed for broadcast and multicast. The 5G-Xcast Mixed Mode enables a dynamic and seamless switching between Point-to-Point (PTP) and PTM transmissions both in the downlink and the uplink. It reuses the NR Rel'15 air interface specification. The 5G-Xcast Terrestrial Broadcast Mode enables the reception of the service to users without uplink capabilities, i.e. being a downlink-only mode. One of its design principles is the transmission over large coverage areas in order to enable High-Power High-Tower (HPHT) network configurations. This deliverable also provides an evaluation of the 5G NR Rel'15 unicast specifications. In addition, the two 5G-Xcast PTM solutions are evaluated in order to demonstrate the more efficient use of the radio resources and their advantages over PTP for the scenarios considered in 5G-Xcast.
Wei Guo
added a research item
Broadcast and multicast will be an important feature supported in 5G New Radio. In this paper a new transmission method is proposed to improve the receiver side User Equipment (UE) resource efficiency by using redundant multicast channels at the transmitting Base Station (BS). Transmission is tailored for UEs with different channel characteristics. A sub-grouping algorithm is designed to fast allocate UEs of a multicast group to their most suitable channels. Numeric sample calculation proves the validity of the proposed method.
De Mi
added a research item
This paper provides the mobility and coverage evaluation of New Radio (NR) Physical Downlink Control Channel (PDCCH) for Point-to-Multipoint (PTM) use cases, e.g., eMBMS (evolved Multimedia Broadcast Multicast Services). The evaluation methodology is based on analyses and link level simulations where the channel model includes AWGN, TDL-A, TDL-C as well as a modified 0dB echo to model different PTM scenarios. The final version of this work aims to provide insightful guidelines on the delay/echo tolerance of the NR PDCCH in terms of mobility and coverage. In this paper, it is observed that under eMBMS scenario, i.e. SFN channel, due to the time domain granularity of pilots distributed inside the PDCCH region, the system can support very high user movement speed/Doppler with an relatively low requirement on the transmit Signal/Carrier-to-Noise Ratio (SNR/CNR). On the other hand however, the system falls short on its coverage due to the low frequency domain granularity of pilots that effects the channel estimation accuracy.
Carlos Barjau
added a research item
In this paper, an innovative Radio Access Network (RAN) architecture design to enable Single Frequency Network (SFN) functionality in 5G Networks is proposed. SFN transmissions impose several challenges and delay constraints in distribution networks. To overcome this, a new functionality is developed by inserting a new logical entity, Centralized Unit Multicast Function (gNB-CU-MC), inside Cloud-RAN architecture. By leveraging 3GPP Release 15 gNB split functionality, and extending eMBMS SYNC protocol (RAN-SYNC) this proposal has minimal imprint over 5G Networks and can support a wide range of SFN transmissions. This design fulfils the requirements for Vehicular and Mission Critical communications, Linear TV distribution or IoT, while overcoming existing limitations in Release 14 eMBMS. A complexity analysis of this solution in terms of imprint over 5G Architecture, latency and dimensionality is used to validate the proposal.
Jose Luis Carcel
added a research item
5G New Radio (5G NR) is the first technology standard to enable mobile communications in three different usage scenarios: enhanced Mobile Broadband (eMBB), Ultra-Reliable Low Latency Communications (URLLC) and massive Machine Type Communications (mMTC). As a result of its technical impact, ITU-R considers 5G NR as candidate technology for the International Mobile Telecommunications for 2020 (IMT-2020) evaluation process. To assess 5G NR performance, IMT-2020 defines multiple Key Performance Indicators (KPIs) related to specific requirements to enable Point-to-Point communications (PTP). IMT-2020 does not consider Point-to-Multipoint (PTM) communications due to the absence of multicast/broadcast capabilities in the current 5G NR standardized solution. Nevertheless, PTM communications are proved to be a key feature for 5G applications in a wide number of vertical sectors as Media & Entertainment, Public Warning or Internet of Things. This paper performs an analysis of different IMT-2020 KPIs for 5G NR PTP and extends the evaluation to a PTM perspective. The results contribute to enhance the role of PTM communications towards the IMT-2020 landmark.
Eduardo Garro
added a research item
This work presents a potential solution for enabling the use of multicast in the 3GPP Release 15 air interface, called 5G New Radio (NR). The proposed multicast mode, denoted as 5G Mixed Mode follows one of the two approaches envisaged in 3GPP, which enables a dynamic and seamless switching between unicast and multicast, both in the downlink and the uplink. This paper also provides a performance evaluation in Single Frequency Networks (SFN) and mobility scenarios, showcasing the potential advantages of this solution over unicast in relevant scenarios.
Roman Odarchenko
added a research item
5G-Xcast is a project focused on Broadcast and Multicast Communication Enablers For the Fifth Generation of Wireless Systems. Within the project for the most number of defined use cases it is necessary to provide adequate throughput, delay, reliability, seamless handover etc. For this purpose multilink approach can be used. This paper describes multilink benefits, its high-level description and implementation to the 5G core architecture for better user experience. Also was described the methodology of the experimental studies to estimate the effectiveness of the proposed solutions. The experiments were conducted in the IRT testbed (Munich) and have shown great increase of the overall QoE.
Roman Odarchenko
added 2 research items
There is a growing demand from operators to deploy converged video delivery solutions across all their networks (fixed and mobile) and across all the screens, to save on operational and equipment costs and to increase QoE. The Internet is replacing vertically-integrated delivery platforms. the main role of a content delivery framework within 5G is to deliver this type of content as efficiently as possible. For this purpose within 5G-Xcast project there was proposed QoE estimation model. For the optimization of the content delivery several techniques can be used. They are QUIC, MooD, ML, ABR and mABR. Each technology has it’s own benefits and limitations, that were considered within the 5G-Xcast.
Juha Kalliovaara
added a research item
This paper presents a transportable and rapidly deployable network system, which can be used to provide local voice, video and data connectivity for critical communications in remote locations and Internet connectivity through commercial mobile network, if available. The network is a stand-alone system, which is independent of external electricity and Internet. It is built with commercial off-the-shelf equipment and software. This paper presents trials of a local tactical voice service, a TETRA-compatible push to talk application, and Licensed Shared Access evolution spectrum manager along with radio signal measurements on 700 MHz and 2300 MHz frequency bands.
Jordi J. Gimenez
added 2 research items
The 3GPP Release-14 specification has enhanced long-term evolution (LTE) enhanced Multimedia Broadcast Multicast Service (eMBMS) to enable the provision of television services according to some of the requirements of the broadcasting industry. These improvements include radio interface enhancements, such as support for larger intersite distances in single-frequency network deployments and the introduction of more flexibility including a dedicated eMBMS carrier with 100% broadcast resource allocation. Although the performance of LTE eMBMS has been extensively evaluated by numerical computations, it is crucial to perform laboratory measurements that provide insights into the operation of the system in a practical setup. This paper describes the construction of eMBMS chains within the laboratory to carry out physical-layer measurements within a controlled environment and presents a methodology to measure the signal-to-noise ratio (SNR) of eMBMS signals (that can time multiplex both unicast and broadcast parts). The SNR thresholds at different modulation and coding schemes are measured independently in the laboratories of the British Broadcasting Corporation Research and Development and Institut für Rundfunktechnik, and the results are compared with the results obtained with numerical evaluations.
3GPP LTE eMBMS release (Rel-) 14, also referred to as further evolved multimedia broadcast multicast service (FeMBMS) or enhanced TV (EnTV), is the first mobile broadband technology standard to incorporate a transmission mode designed to deliver terrestrial broadcast services from conventional high power high tower (HPHT) broadcast infrastructure. With respect to the physical layer, the main improvements in FeMBMS are the support of larger inter-site distance for single frequency networks (SFNs) and the ability to allocate 100% of a carrier's resources to the broadcast payload, with self-contained signaling in the downlink. From the system architecture perspective, a receive-only mode enables free-to-air (FTA) reception with no need for an uplink or SIM card, thus receiving content without user equipment registration with a network. These functionalities are only available in the LTE advanced pro specifications as 5G new radio (NR), standardized in 3GPP from Rel-15, has so far focused entirely on unicast. This paper outlines a physical layer design for NR-MBMS, a system derived, with minor modifications, from the 5G-NR specifications, and suitable for the transmission of linear TV and radio services in either single-cell or SFN operation. This paper evaluates the NR-MBMS proposition and compares it to LTE-based FeMBMS in terms of flexibility, performance, capacity, and coverage.
Jordi J. Gimenez
added a research item
Single Frequency Networks (SFN) are widely adopted in terrestrial broadcasing networks based on High-Power High-Tower (HPHT) deployments. The mobile broadcasting standard Evolved Multimedia Broadcast Multicast Service (eMBMS) also enables SFN operation but with limited performance due to short cyclic prefix (CP) duration, suitable for dense Low-Power Low-Tower (LPLT) networks. An enhancement of the eMBMS specification, by introducing larger CP duration, may allow for the deployment of large area SFNs and even the combined operation of HPHT and LPLT stations. The knowledge of the SINR distribution over an SFN area may facilitate the selection of transmission parameters according to the network topology. This paper presents a semianalytical method for the calculation of the SINR distribution in SFNs with low computational complexity compared to Monte-Carlo simulations. The method, which builds on previous work developed for cellular communications, is applied to HPHT+LPLT SFNs and evaluated against different transmission and network parameters.
Menno Bot
added a research item
The presentation explains how CAP was used to deliver mulimedia alerts to mobile clients using LTE broadcast (eMBMS)
Manuel Fuentes
added a research item
This paper provides a detailed performance analysis of the physical layer of two state-of-the-art point-to-multipoint (PTM) technologies: evolved Multimedia Broadcast Multicast Service (eMBMS) and Advanced Television Systems Committee - Third Generation (ATSC 3.0). The performance of these technologies is evaluated and compared using link-level simulations, considering relevant identified scenarios. A selection of Key Performance Indicators for the International Mobile Telecommunications 2020 (IMT-2020) evaluation process has been considered. Representative use cases are also aligned to the test environments as defined in the IMT-2020 evaluation guidelines. It is observed that ATSC 3.0 outperforms both eMBMS solutions, i.e., MBMS over Single Frequency Networks (MBSFN) and Single-Cell PTM (SC-PTM) in terms of spectral efficiency, peak data rate and mobility, among others. This performance evaluation serves as a benchmark for comparison with a potential 5G PTM solution.
Jordi J. Gimenez
added a research item
The 3GPP Release-14 specification has enhanced LTE eMBMS to enable the provision of television services according to some of the requirements of the broadcasting industry. These improvements include radio interface enhancements such as support for larger inter-site distances in Single Frequency Network deployments and the introduction of more flexibility including a dedicated eMBMS carrier with 100% broadcast resource allocation. Although the performance of LTE eMBMS has been extensively evaluated by numerical computations, it is crucial to perform laboratory measurements that provide insights into the operation of the system in a practical setup. This paper describes the construction of eMBMS chains within the laboratory to carry out physical-layer measurements within a controlled environment and presents a methodology to measure the signal-to-noise-ratio (SNR) of eMBMS signals (that can time multiplex both unicast and broadcast parts). The SNR thresholds at different modulation and coding schemes are measured independently in the laboratories of BBC R&D and IRT and the results are compared with the results obtained with numerical evaluations.
Athul Prasad
added a research item
5G network technologies are evolving in a tremendous pace, enhancing the potential for being adopted and exploited by vertical industries and serve advance networking requirements needs. Towards this direction, a set of 5G PPP projects are providing contributions for tackling aspects related to the overall lifecycle of 5G vertical applications design, development and deployment, including the activation and management of the appropriate network services. In this paper, a cartography of a set of novel solutions facilitating the adoption of 5G technologies by vertical industries is presented, aiming at identifying set of challenges and relevant solutions as well as potential synergies among the related projects.
Jordi J. Gimenez
added a research item
3GPP Release 14 has further improved eMBMS to enable the provision of television services according to requirements commonly found in the broadcasting industry. The improvements include several radio interface enhancements such as the support for larger inter-site distances in SFN deployments, the introduction of a dedicated eMBMS carrier with 100% broadcast resource allocation complete with a new, lower overhead subframe, stripping out the unicast control region. Studied in this paper are the main innovations introduced in Release 14 with respect to SFN coverage performance. Analysis has been carried out for low power low tower (LPLT) i.e. cellular networks and high power high tower (HPHT) networks typical in broadcasting today. Special focus is given to providing reception to fixed roof-top antennas, broadcasters' main coverage mode.
David Gomez-Barquero
added a research item
This document describes the 5G mobile core network that enables multicast and broadcast capabilities where two different alternatives have been considered. This document provides an analysis of the architectural alternatives. The architectural alternatives have been built based on the 5G-Xcast design principles and building blocks. Two different approaches to leverage multicast and broadcast capabilities in 5G mobile core network have been studied: transparent multicast transport and point-to-multipoint services. This document also presents new functionalities and technologies considered within 5GXcast such as converged autonomous switch between unicast, multicast and broadcast for the converged network including fixed broadband and mobile networks, Public Warning for multimedia content, Multilink and Multi-access Edge Computing. In addition, the limitations of eMBMS in LTE that have motivated the current work are also outlined in this document.
De Mi
added 2 research items
In this paper, we consider multigroup multicast transmissions with different types of service messages in an overloaded multicarrier system, where the number of transmitter antennas is insufficient to mitigate all inter-group interference. We show that employing a rate-splitting based multiuser beam-forming approach enables a simultaneous delivery of the multiple service messages over the same time-frequency resources in a non-orthogonal fashion. Such an approach, taking into account transmission power constraints which are inevitable in practice, outperforms classic beamforming methods as well as current standardized multicast technologies, in terms of both spectrum efficiency and the flexibility of radio resource allocation.
The first 5G (5th generation wireless systems) New Radio Release-15 was recently completed. However, the specification only considers the use of unicast technologies and the extension to point-to-multipoint (PTM) scenarios is not yet considered. To this end, we first present in this work a technical overview of the state-of-the-art LTE (Long Term Evolution) PTM technology, i.e., eMBMS (evolved Multimedia Broadcast Multicast Services), and investigate the physical layer performance via link-level simulations. Then based on the simulation analysis, we discuss potential improvements for the two current eMBMS solutions, i.e., MBSFN (MBMS over Single Frequency Networks) and SC-PTM (Single-Cell PTM). This work explicitly focus on equipping the current eMBMS solutions with 5G candidate techniques, e.g., multiple antennas and millimeter wave, and its potentials to meet the requirements of next generation PTM transmissions.
Manuel Fuentes
added 3 research items
Broadcast and multicast represent a key opportunity in 5G for the massive consumption of multimedia services in the near future. These technologies permit to offload an important portion of this traffic in peak demand scenarios where users are consuming parallel content. An initial specification of 5G New Radio (NR) Rel'15 was delivered in December 2017 and the final version will be published in June this year. However, 3GPP has not yet defined any broadcast/multicast solution for Rel'15 NR, although some proposals will be revisited as soon as time units in Rel'16 become available. In this work, we analyze the use of a mixed mode that shares multicast, broadcast and unicast resources via the same physical channel. This technology, as well as its LTE counterpart, is evaluated through link level air interface and subsequently system level simulations, providing an objective insight roads to MBMS provision in 5G NR.
5G New Radio (NR) is the wireless standard that will become the foundation for the next generation of mobile networks. NR implements different techniques that improve the performance in terms of data rate, coverage, reliability, latency or mobility. However, NR still has room for performance improvement in modulation, since it employs uniform Quadrature Amplitude Modulation (QAM) constellations to map information bits into complex symbols. Non-Uniform Constellations (NUC) are a practical solution to reduce the gap to Shannon. They are optimized by means of signal geometrical shaping for a specific signal-to-noise ratio (SNR) and channel model. Non-Uniform Constellations (NUCs) are presented in this paper as a potential technique to be implemented in future releases of 5G NR. A novel algorithm is also introduced for the design of NUCs for specific Modulation and Coding Schemes (MCS), which offer high performance gains compared to QAM. The optimized constellations provide gains up to 0.8 dB for AWGN channel.
Athul Prasad
added a research item
Virtual reality is one of the most challenging use cases in 5G due to the need for simultaneous support for high data rates, low-latency and high-reliability. In this work, we consider a radio resource efficient mechanism for the mass delivery of such content to a multitude of users with D2D augmented 5G broadcast. Based on detailed performance evaluations conducted using 5G system setting, it is shown that the optimized mechanism can provide significant gains in terms of cell-edge user throughput and resultant spectral requirements for broadcast. The performance gains are obtained due to the ability of the system to optimize the operating point, instead of targeting the worst user which has been the traditional approach for broadcast. The proposed mechanism could be an enabler for mitigating the key challenges currently foreseen for the broadcast of such immersive content.
Ece Öztürk
added a research item
Enhanced TV (enTV) features introduced into Long Term Evolution (LTE) Evolved Multimedia Broadcast/Multicast Service (eMBMS) have attracted TV broadcasters to offer their services also over eMBMS to enable service continuity and greater coverage. Considering the usual service quality offered by these content providers, an important question becomes how to deliver the offered services also over eMBMS while achieving an acceptable level of quality. In this paper, the results of an investigation that was performed for ATSC 3.0 Dynamic Adaptive Streaming over HTTP (DASH) TV broadcasting service are reported. While adequate service quality was achieved through LTE carrier aggregation (CA), additional error robustness schemes, and a flexible service configuration framework, crucial input for 5G design considerations, are derived.
David Gomez-Barquero
added a research item
This report defines technical requirements for the WP3 on Radio Access Network (RAN) for the use cases of the four vertical sectors on Media & Entertainment, Public Warning, Automotive, and Internet of Things. The selection of the Key Performance Indicators (KPI) and evaluation methodology for the RAN benchmark has been aligned with one defined by the ITU-R for the IMT-2020 RIT evaluation process. The main target in the performance evaluation of the technical KPIs has been the technical standard 3GPP Rel’14 LTE-Advanced-Pro specification for both Point-to-Point (PTP) and Point-to-Multipoint (PTM) transmission modes. For PTM the evaluation has includes SC-PTM, eMBMS (MBSFN) and ATSC 3.0 systems. The selected test environments are representative of the WP2 use cases and are also aligned to the test environments as defined in the IMT-2020 evaluation guidelines. The performance evaluation will serve as the benchmark to compare with the performance of 5G-Xcast new radio solutions developed throughout the project.
Juha Kalliovaara
added a research item
This paper presents a trial on sharing spectrum between different actors in a flexible manner in 2.3 GHz band. Trial demonstrates a flexible use of shared spectrum providing means for the broadcasters and other Programme Making and Special Events (PMSE) stakeholders to gradually upgrade their equipment towards LTE/5G radio based equipment.
Athul Prasad
added a research item
Exponential increase in data rate demand has lead to the periodic upgrade of mobile network infrastructure, with a new generation of wireless access technology being developed every decade. Currently, the fifth generation (5G) of mobile networks supporting higher data rates and reliability, with lower latency are being developed and planned to be deployed. Point-to-Multipoint or multicast / broadcast communication, which has received limited attention so far in 5G, enables the delivery of common content to a multitude of users, while consuming minimal amount of radio resources. In this work, we consider the usage of unlicensed spectrum for enabling such transmissions using enhancements of the currently specified LTE-Advanced eMBMS network. The proposed enhancements are fully compatible with distributed radio access network deployments, and require limited coordination between base stations. Using realistic 5G network assumptions, we also evaluate performance of such enhancements in delivering media content to a large number of users.
David Gomez-Barquero
added a research item
This deliverable sets out the vision of a flexible, self-organizing content delivery network which can combine unicast, multicast, broadcast and caching to deliver content cost-effectively at scale. It outlines the broad operation of such as system in a network-agnostic manner and identifies and proposes the core functional elements and the key technology components work together in an overall content delivery system to help realise the 5G-Xcast content delivery vision.
David Gomez-Barquero
added 5 research items
In the recent past, with the ubiquitous adoption of smartphones and tablets, there has been an exponential increase in data rate demands which has become increasingly challenging for network operators to support. This trend is expected to continue in future, with the advent of high-performance gaming and increasing appetite for immersive applications and social media experiences. Such factors have contributed to the development of the fifth generation (5G) of mobile networks, which would be supporting significantly higher data rates with improved reliability and latency. 5G has also enabled the deployment of wireless virtual reality applications, with wide-ranging use cases. In this work, we consider the key challenges for broadcasting such content to a large number of audience thereby enabling new disruptions in mass media consumption. The technology potential and practical constraints for such deployments were also evaluated using realistic network settings. Based on the performance evaluations, it was shown that with slightly higher system bandwidth requirements, VR broadcast can be supported under ideal conditions, using 5G millimeter wave small cell networks. Potential areas for future work in order to make VR broadcast a reality is also discussed.
David Gomez-Barquero
added a project goal
5G-Xcast is a second phase 5G-PPP Horizon 2020 European project with the following objectives:
• Develop broadcast and multicast point to multipoint (PTM) capabilities for 5G considering Media & Entertainment (M&E), Automotive, Internet-of-Things and Public Warning (PW) use cases.
• Design a dynamically adaptable 5G network architecture with layer independent network interfaces to dynamically and seamlessly switch between unicast, multicast and broadcast modes or use them in parallel and exploit built-in caching capabilities.
• Experimentally demonstrate the 5G key innovation developed in the project for the M&E and PW verticals.
More information: www.5g-xcast.eu
(H2020-ICT-2016-2 call, grant number 761498)