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5 5 g – a different ph-ylosophy

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5 5 g – a different ph-ylosophy

  1. 1. 5G – A Different PHYlosophy? Nicola Marchetti CPqD, Campinas, Brazil November 6, 2013
  2. 2. OUTLINE • • • • What I do at a Glance Is PHY Research still needed? 5G Technologies 5G - A Different PHYlosophy?
  3. 3. OUTLINE • • • • What I do at a Glance Is PHY Research still needed? 5G Technologies 5G - A Different PHYlosophy?
  4. 4. What I do at a Glance Physical Layer & Radio Resource Management for Optical and Wireless Systems RRM PHY Complex Systems Theory 4
  5. 5. What I do at a Glance (2) Many Base Stations Many Antennas Radio Resource Management Synchronization 5
  6. 6. What I do at a Glance (3) Free Spectrum Detection Optical Wireless Integration Complex Communication Systems 6
  7. 7. OUTLINE • • • • What I do at a Glance Is PHY Research still needed? 5G Technologies 5G - A Different PHYlosophy?
  8. 8. Cellular Network Evolution • HSDPA/HSUPA (2005-08) 3.5 G 3.9 G – 3GPP Rel 5/6 – 14 / 5.7 Mbps peak DL/UL – CDMA & Diversity • HSPA+ (2008-09) – 3GPP Rel 7 – 28 / 11 Mbps peak DL/UL – CDMA & MIMO • LTE-A (2012-13) – 3GPP Rel 9/10 – 1 Gbps / 500 Mbps peak DL/UL – OFDMA & SC-FDMA & MIMO • 5G (2013-?) – 10+ Gbps / 5+ Gbps peak DL/UL • LTE (2010-11) – 3GPP Rel 8 – Power & cost reduction – 100 / 50 Mbps peak DL/UL – New bands, Self– OFDMA & SC-FDMA & MIMO organization, Massive MIMO, Small cells 4 G 5 G 8
  9. 9. Is PHY Research still needed? • Spectral efficiency  more antennas, higher modulation order, ultra dense deployment (and related channel understanding), distributed schemes (and related synchronization issues) • Power efficiency  small cell deployments, coordinated beamforming (CoMP) • Cost reduction  cheaper deployments (small cells), cheaper bands (mm-wave, LSA) • All the above has a lot to do with PHY !!! 9
  10. 10. Cooper’s Law •More Spectrum •Frequency Division •Modulation & Coding •Spectrum Reuse 10
  11. 11. OUTLINE • What I do at a Glance • Is PHY Research still needed? • 5G Technologies – – – – – More Spectrum Frequency Division Modulation & Coding Spectrum Reuse EU ADEL Project • 5G - A Complex Matter?
  12. 12. OUTLINE • What I do at a Glance • Is PHY Research still needed? • 5G Technologies – – – – – More Spectrum Frequency Division Modulation & Coding Spectrum Reuse EU ADEL Project • 5G - A Complex Matter?
  13. 13. The “Sweet” Spot • Opportunistic spectrum access: spectrum sharing paradigm that allows unlicensed secondary users to opportunistically access spectrum holes, called white spaces, in the bands for which the primary users hold a license • Although Cognitive Radio systems can be envisaged in any part of the radio spectrum, the frequency range considered more appropriate for their implementation is located between 100 MHz and 10 GHz • This includes the 300-3000 MHz range that OFCOM has dubbed the sweet spot for spectrum sharing 13
  14. 14. Bands & Spectrum Access Techniques F. Paisana, N. Marchetti, L. DaSilva, “Radar, TV and Cellular Bands: Which Spectrum Access Techniques for Which Bands?”, IEEE Communications Surveys &Tutorials, accepted for publication subject to minor revisions 14
  15. 15. Enhanced Carrier Aggregation J. McMenamy, I. Macaluso, N. Marchetti, L. Doyle, “A Framework for Enhanced Carrier Aggregation with Dynamic Carrier Selection”, Wireless Days 2013 15
  16. 16. OUTLINE • What I do at a Glance • Is PHY Research still needed? • 5G Technologies – – – – – More Spectrum Frequency Division Modulation & Coding Spectrum Reuse EU ADEL Project • 5G - A Complex Matter?
  17. 17. Uplink Synchronization 17
  18. 18. Uplink Synchronization (2) • Detection techniques with very low complexity – Utilization of the symmetrical behaviour of interference among different subcarriers A. Farhang, N. Marchetti, L. Doyle, “Low Complexity LS and MMSE Based CFO Compensation Techniques for the Uplink of OFDMA Systems”, IEEE International Conference on Communications 2013 18
  19. 19. OUTLINE • What I do at a Glance • Is PHY Research still needed? • 5G Technologies – – – – – More Spectrum Frequency Division Modulation & Coding Spectrum Reuse EU ADEL Project • 5G - A Complex Matter?
  20. 20. Massive MIMO 2.4 GHz F. Bentosela, N. Marchetti, H. Cornean, “MIMO Capacity: Transition from Linear to Logarithmic Growth”, IEEE Transactions on Antennas and Propagation, under review 20
  21. 21. Massive MIMO (2) F. Bentosela, N. Marchetti, H. Cornean, “MIMO Capacity: Transition from Linear to Logarithmic Growth”, IEEE Transactions on Antennas and Propagation, under review 21
  22. 22. Optical-Wireless Integration • How to integrate mobile and fixed access networks? • How to jointly optimize the overall network? 22
  23. 23. Inter Base Station Communications • To perform handover and more advanced cooperation schemes, base stations need to communicate with low latency • It is necessary to investigate if the tree architecture has a good performance or if other architectures should be considered • Cooperative multipoint transmission/reception (CoMP) – Data and control information can be multicasted to base stations, exploiting the broadcasting nature of the Passive Optical Network 23
  24. 24. mm-Wave & Massive MIMO • Using very high carrier frequencies (up to hundreds of GHz)… • …one can squeeze more antennas in the same base station/device • Target Line Of Sight short range (up to ~100m) communications at the beginning • Later on we expect to start to look into Non Line Of Sight wider range communication (distributed massive MIMO/CoMP, with many antennas at each base station, and base stations coordinating their transmissions) 24
  25. 25. OUTLINE • What I do at a Glance • Is PHY Research still needed? • 5G Technologies – – – – – More Spectrum Frequency Division Modulation & Coding Spectrum Reuse EU ADEL Project • 5G - A Complex Matter?
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  29. 29. Higher Throughput & Lower Power C. Galiotto, N. Marchetti, L. Doyle, “The Role of the Total Transmit Power on the Linear Area Spectral Efficiency Gain of Cell-Splitting”, IEEE Communications Letters, accepted for publication, to appear 29
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  32. 32. Spectrum Management and ICIC in HetNet Inter-Cell Interference Coordination via spectrum management Mitigation of the harm of interference on macro-cell edge users  Reduction of overall network throughput  GOAL: Guaranteeing cell-edge user throughput with limited reduction of overall network throughput 32
  33. 33. User Operating Points LPN = Low Power Node MBS = Macro Base Station PF = Proportional Fair scheduler C. Galiotto, N. Marchetti, L. Doyle, “Flexible Spectrum Sharing and Interference Coordination for Low Power Nodes in Heterogeneous Networks”, IEEE Vehicular Technology Conference 2012 33
  34. 34. Results C. Galiotto, N. Marchetti, L. Doyle, “Flexible Spectrum Sharing and Interference Coordination for Low Power Nodes in Heterogeneous Networks”, IEEE Vehicular Technology Conference 2012 34
  35. 35. Complex Communication Systems I. Macaluso, H. Cornean, N. Marchetti, L. Doyle, “Complex Communication Systems Achieving Interference-Free Frequency Allocation”, IEEE International Conference on Communications 2014, submitted 35
  36. 36. Self-Organizing Channel Assignment h  1.29 EC  2.04 I. Macaluso, H. Cornean, N. Marchetti, L. Doyle, “Complex Communication Systems Achieving Interference-Free Frequency Allocation”, IEEE International Conference on Communications 2014, submitted 36
  37. 37. OUTLINE • What I do at a Glance • Is PHY Research still needed? • 5G Technologies – – – – – More Spectrum Frequency Division Modulation & Coding Spectrum Reuse EU ADEL Project • 5G - A Complex Matter?
  38. 38. Advanced Dynamic spectrum 5G mobile networks Employing Licensed shared access ADEL Seventh Framework Programme for Research of the European Commission
  39. 39. EU project ADEL Key Idea To explore the potential of Licensed Shared Access (LSA) as a key enabler of 5G mobile broadband networks By developing: 1) Collaborative sensing techniques 2) Dynamic radio-aware resource allocation 3) Cooperative communication With the final goal of providing: – An order of magnitude improvement in spectral efficiency – More energy & cost efficient mobile broadband networks 39
  40. 40. Facts • 2.5 M euro (270 K euro for CTVR) • Small or medium-scale focused research project (STREP) – ranked 4th out of 130 at EU level • 8 partners (5 academia, 3 industry) • 3 years (Dec 1, 2013 – Nov 30, 2016) 40
  41. 41. Motivation • Key driver: to meet the growing capacity demands in cellular networks imposed by the increasing customer base and datahungry mobile applications • Key concept: The “Licensed Shared Access” (LSA) (a.k.a. “Authorised Shared Access” – ASA) paradigm wherein: incumbent operators may allow others to share their spectrum at specific times and places, according to an agreed set of rules • State-of-the-art: the use of spectrum in commercial applications is either licensed or license-exempt . Cognitive radio is another approach but it has been met with scepticism by cellular operators and has led to very limited deployments (e.g. 802.22) 41
  42. 42. LSA concept and basic architecture [Contains incumbent’s spectrum usage information in frequency, time & space] [Computes rule-based LSA spectrum availability] [Issues RRM commands] Operations Administration & Management 1) Shared use of spectrum based on radio cognition 2) Implemented via individual authorisation scheme ensuring QoS 3) Access rights can be granted on a temporary or long term basis J. Khun-Jush, P. Bender, B. Deschamps, and M. Gundlach, “Licensed shared access as complementary approach to meet spectrum demands: Benefits for next generation cellular systems,” ETSI Workshop on on Reconfigurable Radio Systems, December 2012 42
  43. 43. Component technologies • • • • • • Collaborative spectrum sensing Signal processing techniques for sensing Interference channel estimation and interferer localisation Cooperative communication Dynamic resource allocation Policy violation detection / policy reinforcement With the above, we believe that ADEL will lead to future heterogeneous wireless networks of an order of magnitude higher capacity and energy efficiency thus setting the roadmap for the adoption of spectrum flexible broadband wireless systems by 2020 43
  44. 44. Work package structure Project Management (WP1) Scenarios, Requirements and Network Architecture Definition (WP3) “Who, When, Where” Licensed Shared Access Resource Allocation Techniques (WP4) Dynamic Spectrum Access (WP5) “How” Platform Development and Experimental Evaluation (WP6) Dissemination & Exploitation Planning (WP2) 44
  45. 45. Concrete results expected • Spectral efficiency: a factor of 10 is aimed at • Energy efficiency: also a factor of 10 is anticipated • Cost: at least a factor of 10 improvement for mobile data traffic via the use of small cells with LSA • Experimental platforms: are expected to show some of these gains over-the-air, as well as over large-scale system level simulations WARP IRIS Open Air 45
  46. 46. OUTLINE • • • • What I do at a Glance Is PHY Research still needed? 5G Technologies 5G - A Different PHYlosophy?
  47. 47. Are Comm Systems Complex? Many different networks coming together • • • • Optical & wireless WiFi, LTE, sensors, RFID etc. Many simple devices densely deployed Many antennas Highly dynamical systems • high variability in time, but also in frequency and space domains 47
  48. 48. Are Comm Systems Complex? • Self-organization and need to mimic bio-inspired decentralized behaviours – Evolution (but not only) – Emergence of (complex) patterns Trend towards increasing complexity 48

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