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5G & Beyond: Promises and Challenges

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As the worldwide deployment of the long-term evolution (LTE, a.k.a. 4G) system is spreading out, a possible 5G standard is in active discussion and has captured the attention of researchers from both the academia and the industry. While each of the previous generation upgrades brought about 10x increase of system throughput, some 100x or even 1000x improvement is expected for the next decade in order to accommodate the explosion of data traffic, driven by the exponential increase of mobile devices as well as bandwidth consuming applications such as video streaming and mobile gaming. Unarguably, the only ways to fulfill such a demand are through new innovative physical layer techniques with very-high spectral efficiency (e.g., massive MIMO), exploitation of new spectrum toward much higher frequencies (e.g., millimeter wave), and ultra densification of wireless networks. Besides throughput, latency, energy efficiency, and high mobility are all equally important and should be taken into account.

The goal of this reunion is for some of the top researchers in the domain to present their vision on what the 5G may look like, their takes on today's hot 5G-related research topics (cloud RAN, massive MIMO, mmWave, small cell, interference alignment, full-duplex radio, …), and what are the challenges to implement those theoretically appealing techniques. On-going PhD works related to 5G will also be presented by students from different universities/institutions in France. 




Call for participation:


Researchers that are interested in presenting their work can submit their proposal (title and abstract) via email to the organizers until the 26th of September 2014. In particular, the participation of PhD students working on these topics is highly encouraged.


Confirmed Speakers:




8h50-9h20: Reception with Coffee
9h20-9h30: Introduction
9h30-10h30: Giuseppe Caire (TU-Berlin)
5G and Beyond: A Theoretician's Perspective
10h30-11h15: Alistair Urie / Philippe Sehier (Alcatel-Lucent)
It’s all about the fifth G
11h15-11h35: Zheng Chen (PhD student at SUPELEC, Gif sur Yvette)
Distributed SIR-Aware Opportunistic Access Control for D2D Underlaid Cellular Networks 
11h35-12h20: Raymond Knopp (EURECOM, Sophia Antipolis)
Coding and Multiple-Access for Sporadic and Small-Payload Traffic Sources
12h20-12h40: Jérémy Nadal (PhD student at Telecom Bretagne / Lab-STICC, Brest)
 FBMC/OQAM baseband for 5G mobile communication systems: hardware design and on-board prototyping
12h40 - 14h00: Lunch Break
14h00-14h45: David Gesbert (EURECOM, Sophia Antipolis)
Team-based cooperation in decentralized wireless networks
14h45-15h05: Victor Quintero (PhD student at INSA / INRIA, Lyon)
On the benefits of Channel-Output Feedback in 5G
15h05-15h50: Markus Mueck (Intel, Munich)
The path to 5G – New Spectrum Access Paradigms and Mobile Device Reconfigurability
15h50-16h10: Coffee Break
16h10 - 16h55: Eric Hardouin (Orange Labs, Issy les Moulineaux)
5G: An operator view
16h55 - 17h15: Elie Awwad (PhD student at Telecom Paristech, Paris)
Emerging optical MIMO systems for future telecommunication networks
17h15 - 18h00: Merouane Debbah (Huawei, Paris)
5G Energy Efficient Wireless Design


Résumés des contributions


Title: 5G and Beyond: A Theoretician's Perspective
Speaker: Giuseppe Caire, TU-Berlin
Abstract: In the past 1-2 years, corporate visions on ``beyond 4G'', ``5G'' and even ``beyond 5G'' have been put forward by virtually all the major wireless communications manufacturers and operators. Often, such visions reduce to a list of target performances in terms of rates, ``delay'', and user devices mobility, without a clear understanding on how such targets are defined and whether they are at all achievable. 
In this talk, I will present my own overview on 5G, in terms of solving certain shortcomings of today's systems and, at the same time, listing a number of theoretical results, the corresponding promising enabling technologies, and the interactions and synergies among them. The main message of this talk is that system spectral efficiency increases up to 100x are in the reach of today's theory and perhaps tomorrow's technology, provided that the whole system architecture is re-thought and designed according to solid theoretical principles. In contrast, going after individual ``plug-and-play''  silver bullets, to be included in a backward compatible mode into existing architectures, is unlikely to provide large gains. 
Title: The path to 5G – New Spectrum Access Paradigms and Mobile Device Reconfigurability
Speaker: Markus Mueck, Intel (Munich)
Abstract: By the year 2020, upcoming 5G systems are expected to provide a 1000-fold increase of wireless broadband capacity compared to today’s deployed solutions. Commonly agreed ingredients for reaching this objective are i) new spectrum, ii) increased spectral efficiency and iii) Base Station densification. This talk will focus on the new spectrum direction and will provide a state-of-the-art overview as well as a future outlook on activities by political stakeholders, regulation authorities and standardization bodies over the world. In particular, current evolutions on new spectrum usage paradigms will be commented and discussed such as Licensed Shared Access (LSA) based Spectrum Sharing, uncoordinated as well as coordinated access to TV White Space Spectrum, the role of mmWave spectrum, etc. Details will be given on the very efficient interworking of the European Commission, European Regulation Administrations (CEPT) and ETSI Standardization in order to aggressively drive the development of Licensed Shared Access Technology in Europe.  
Title: Distributed SIR-Aware Opportunistic Access Control for D2D Underlaid Cellular Networks 
Speaker: Zheng Chen, PhD student, SUPELEC
Abstract: Device-to-Device (D2D) communication has recently attracted significant attention and is envisaged to be a key feature of 5G wireless networks and 3GPP LTE Rel. 12. As in D2D underlaid cellular networks D2D mobile users opportunistically access cellular spectrum occupied by cellular users, thus creating interference between each other, power control and opportunistic medium access control are two effective approaches to mitigate or harness interference caused by dense D2D link deployments. We propose a distributed interference and channel-aware opportunistic access control technique for D2D underlaid cellular networks, in which each potential D2D link is active whenever its estimated signal-to-interference ratio (SIR) is above a predetermined threshold so as to maximize the D2D area spectral efficiency. Specifically, we provide two expressions for the optimal SIR threshold, which can be applied in a decentralized way on each D2D link, so as to maximize the D2D area spectral efficiency derived using the unconditional and conditional D2D success probability respectively.
Title: Coding and Multiple-Access for Sporadic and Small-Payload Traffic Sources
Speaker: Raymond Knopp, EURECOM
Abstract: One of the main challenges in 5G networks and to a lesser extent in future releases of 4G as well, is to optimize physical resource allocation for an ever increasing diversity of traffic sources. We will surely witness an explosion of small, cheap and autonomous machines connected to 4G and 5G networks, and consequently 5G must address the spectral-efficiency aspects of these complex networks in the upcoming standardization phase. The key challenge is to devise efficient coding and multiple-access strategies tailored to the combination of conventional and machine-type traffic that will be transported by 5G networks. In this talk we survey some recent results on coding and multiple-access for information sources which are characterized by low-throughput, small-payload and sporadic arrivals which are transported over broadband channels. Moreover, these sources may be event-driven and generate spatially and temporally-correlated information.  We put specific emphasis on the simplest such sources (sensors) which upload isolated analog samples to the network.
Title: FBMC/OQAM baseband for 5G mobile communication systems: hardware design and on-board prototyping
Speaker: Jérémy Nadal, PhD student, Telecom Bretagne / Lab-STICC, Brest
Abstract: In this talk we present a new design and prototyping experience of an advanced communication system based on ?lter-bank multi-carrier and offset-quadrature-amplitude modulation (FBMC/OQAM). This modulation is being studied and considered nowadays by recent research projects as a key enabler for the future ?exible 5G air interface. It exhibits better spectrum shape compared to the traditional OFDM (Orthogonal Frequency-Division Multiplexing) and enables better spectrum usage and mobility support. In this context, a complete and efficient hardware implementation on an FPGA-based digital baseband (DBB) platform is proposed. This work is done in the framework of METIS (Mobile and wireless communications Enablers for the Twenty-twenty Information Society, ICT-317669), the EU flagship 5G project, with the objective of laying the foundation for 5G systems and building consensus prior to standardization. 

Title: Team-based cooperation in decentralized wireless networks
Speaker: David Gesbert, EURECOM
Abstract: Pushed by the demand for bandwidth hungry multimedia and internet related services, wireless communication engineers seek to maximally exploit the spectral resources in all available dimensions, generating massive amounts of interference in the process. A crucial approach envisioned in 5G wireless to handling interference lies in the notion of network coordination and cooperation which can take place between otherwise competing nodes in the networks (terminals, relays, base stations etc.) Coordination can take place in a variety of domains such as resource control, scheduling, beamforming, power control, etc.
Decentralized cooperation/coordination poses both new theoretical and practical challenges. In this talk we briefly present the essence of such techniques and focus on the fundamental trade-off between coordination and information exchange. We make connections with the intriguing mathematical field of team decision theory and present several open problems in this area at the cross-roads between signal processing, information theory and control.
Title: On the benefits of Channel-Output Feedback in 5G
Speaker: Victor Quintero, PhD student, INSA / INRIA Lyon
Abstract: In this short-talk, the benefits of feedback in 5G communications systems are highlighted in simple but insightful multi-user channel models. Using arguments from information theory and game theory, it is shown that channel-output feedback enlarges both the capacity region and the equilibrium region of centralized and decentralized networks, respectively. In particular, it is shown that these benefits still hold even in the case in which feedback signals are unpaired by additive noise and/or feedback channels are rate-limited. 

Title: It’s all about the fifth G
Speaker: Alistair Urie / Philippe Sehier, Alcatel-Lucent
Abstract: 5G mobile systems are expected to be deployed starting 2020 and will be designed to meet the key requirements of more uniform end user experience, reduced latency, improved battery life and improved capacity.  We expect that new radio interfaces will need to be defined to meet these requirements with 5G access technologies being used in parallel to LTE and WLAN with multiple carriers, sites and radio access technologies combined together using a mixture of carrier aggregation, dual connectivity and CoMP solutions.  This talk will highlight some of the key considerations driving 5G definition and present details on UF-OFDM, one of the leading 5G radio waveform candidates.
Title: 5G: An operator view
Speaker: Eric Hardouin
Abstract: As academia and industry are currently investing a lot of effort into 5G research, this talk will provide Orange's vision on 5G. In particular, we will describe our views in terms of services, system requirements, key technology components and industry timeline. The focus will be on wireless, but core network aspects will be also discussed. Indeed, for us 5G is the future Internet as a whole, including radio access networks and a convergent core network between fixed access and radio access(es).
Title: Emerging optical MIMO systems for future telecommunication networks
Speaker: Elie Awwad, PhD student, Telecom ParisTech
Abstract: 5G promises to meet the growing needs for higher bitrates (up to some Gbits/s) of futuristic applications of information technologies such as telepresence, internet of things, human-centric communications and big data in its wide sense. This requires a reconfiguration or a modification of the architecture of today's network to increase their capacities and optimally use the available resources (frequency, time, space...). Among the major technical challenges, we identify the need for an ultra-high-rate optical-fiber based backbone network to which wireless towers are connected. We address, in this talk, the latest advancements in the field of high-rate optical transmission systems (hundreds of Terabits/s) that are able to fulfill the requirements of 5G networks. We mainly focus on emerging optical MIMO systems based on polarization and space division multiplexing.
Title: 5G Energy Efficient Wireless Design 
Speaker: Merouane Debbah, Huawei (Paris)
Abstract: Assume that one is given the ability to design from scratch a network deployment to uniformly cover a given area with maximal energy efficiency (EE). What are the optimal number of antennas, active users, and transmitpower taking into account the mobility pattern?The aim of this talk  is to answer this fundamental question. We consider jointly the uplink and downlink with different processing schemes at the base station and propose a new realistic power consumption model that reveals how the above parameters affect the EE. Closed-form expressions for the EE-optimal value of each parameter  are provided for several signal processing  schemes.  The expressions prove in particular how the parameters interact and  highlight in which regime Massive MIMO or Small Cells are the answer.


Date : 2014-10-06

Lieu : SUPELEC (Amphi Janet)

Thèmes scientifiques :
D - Télécommunications : compression, protection, transmission

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