LTE-Advanced Enhancements and Future Radio Access Toward 2020 and Beyond

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LTE-Advanced Enhancements and
Future Radio Access
Toward 2020 and Beyond

Takehiro Nakamura
NTT DOCOMO, INC.

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LTE-Advanced Enhancements and Future Radio Access Toward 2020 and Beyond

  1. 1. Broadband World Forum 2013 LTE-Advanced Enhancements and Future Radio Access Toward 2020 and Beyond Takehiro Nakamura NTT DOCOMO, INC. NTT DOCOMO, INC., Copyright 2013, All rights reserved. 1
  2. 2. Release of 3GPP specifications 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Release 99 W-CDMA Release 4 1.28Mcps TDD Release 5 HSDPA Release 6 HSUPA, MBMS Release 7 ITU-R M.1457 IMT-2000 Recommendation ITU-R M.2012 IMT-Advanced Recommendation HSPA+ (MIMO, HOM etc.) Release 8 LTE Release 9 Minor LTE enhancements Release 10 LTE-Advanced Release 11 Release 12 NTT DOCOMO, INC., Copyright 2013, All rights reserved. To be frozen in June 2014 2
  3. 3. 3GPP LTE Release 12 NTT DOCOMO, INC., Copyright 2013, All rights reserved. 3
  4. 4. Key Features in Release 12 Physical layer aspects • Study Item – – – – – Small Cell Enhancement 3D-channel model for Elevation Beamforming and Full Dimension-MIMO Network-Assisted Interference Cancellation and Suppression Device to Device (D2D) Proximity Services Coordination Multi-Point (CoMP) with non-ideal backhaul • Work Item – Further enhancements to TDD for DL/UL Interference Management and Traffic Adaptation (eIMTA) – Further DL MIMO Enhancement – Low cost & enhanced coverage MTC UE – TDD-FDD Joint Operation – Coverage Enhancements NTT DOCOMO, INC., Copyright 2013, All rights reserved. 4
  5. 5. Small Cell Enhancements (SCE) -PHY aspects• Objective – Spectrum efficiency improvements • Higher order modulation (e.g., 256QAM) • Overhead reduction, control signaling enhancement RS – Efficient small cell operation • • • • Interference avoidance and coordination Small cell ON/OFF, load balancing/shifting Efficient small cell discovery Radio Interface-based sync. 256QAM Replace RS by data Efficient discovery – Physical layer study for higher-layer aspects • Dual connectivity to macro and small cell layers • Mobility enhancements Small cell OFF Sync and/or coordination among small cells • DOCOMO’s view – Consider dense small cell deployment with higher frequency band Control functionalities – Propose • Phantom cell concept (Dual connectivity) • Efficient discovery mechanism • etc. NTT DOCOMO, INC., Copyright 2013, All rights reserved. Realtime services (e.g., VoLTE) Best effort services 5
  6. 6. MIMO Enhancements Rel-10 MIMO • Max. 8-Tx (Max. 4-Tx for FDD) • Achieves beamforming in azimuth angle Optimization for realistic environment Beamforming in azimuth/elevation angle Enhancement of the number of antennas Rel-12 MIMO 2D MIMO enhancement 3D MIMO using active antenna system Study of 3D channel model (3D UE distribution, 3D pathloss, fast fading, etc Elevation beam forming Full dimension-MIMO NxM antennas (Using higher freq.) N M • 4-Tx codebook enhancement • Feedback enhancement for MUMIMO • Max. 8-Tx  Beam gain and interference reduction using 3D beam • More than 8-Tx (e.g., 16, 32, …) • Higher freq. (e.g., 3.5 GHz-) Progressive capacity enhancement •DOCOMO’s view – Focus on • Full dimension MIMO with higher frequency band NTT DOCOMO, INC., Copyright 2013, All rights reserved. 6
  7. 7. NW-Assisted Interference Cancellation and Suppression Rel. 11 Advanced receiver Target for receiver Rel. 12 Advanced receiver Interference limited areas, i.e., cell edge All areas including cell edge ■Target for Advanced receiver Inter-UE interference for MU-MIMO • Inter-cell interference at cell edge Severer interference for other scenarios Study on a variety of receiver types and need of interference information – Interference suppression: Enhancement of Rel-11 receiver – Interference cancellation: Subtraction of interference replica from received signal, e.g., SIC •DOCOMO’s view – Propose/Investigate • NW-assisted signaling • Receiver performance NTT DOCOMO, INC., Copyright 2013, All rights reserved. 7
  8. 8. TDD-FDD Joint Operation • Objective – TDD-FDD carrier aggregation • Either TDD or FDD as Pcell – TDD-FDD joint operation (e.g., multistream aggregation, dual mode UE) • Identify deployment scenarios of joint operation on FDD and TDD spectrum, and network/UE requirement eNB FDD UL DL • DOCOMO’s view – Very interested in TDD-FDD carrier aggregation – Consider FDD Pcell (Macro cell) and TDD Scell (many Small cells) with higher frequency band – Propose • TDD-FDD carrier aggregation mechanism TDD UL/DL Freq. SCell PCell UL/DL SCell UL/DL SCell UL/DL SCell NTT DOCOMO, INC., Copyright 2013, All rights reserved. 8
  9. 9. Device to Device (D2D) proximity service • Objective With NW coverage Discovery Required both for public safety & nonpublic safety Public safety only Communication – Commercial use with NW coverage – Public safety/critical communication with/without NW coverage – Two kinds of technical topics Without NW coverage Required at least for public safety Public safety only • D2D discovery • D2D communication Current NW Within NW coverage Internet Outside NW Internet Disaster, Terror D2D Streaming, Mail, etc. Discovery Advertise, Discovery Comm. for + Communication public safety ITS, etc. •DOCOMO’s view – Interested in commercial discovery – Propose/Investigate • D2D discovery mechanism NTT DOCOMO, INC., Copyright 2013, All rights reserved. 9
  10. 10. eIMTA* (Dynamic TDD) * eIMTA: Further enhancements to LTE TDD for DL-UL interference management and traffic adaptation • Objective DL-to-UL interference – TDD UL-DL reconfiguration for traffic adaptation • Reconfiguration mechanism • HARQ scheme Cell 2 Cell 1 UL-to-DL interference – Interference mitigation with TDD UL-DL reconfiguration • UL power control • DOCOMO’s view – Interested in this topic with higher frequency band – Propose/Investigate • Interference mitigatation scheme • HARQ mechanism NTT DOCOMO, INC., Copyright 2013, All rights reserved.  Interference mitigation schemes Scheme 1 Scheme 2 Cell clustering Scheduling enhancement Scheme 3 Scheme 4 Interference mitigation based on (F)eICIC Interference suppressing and mitigation 10
  11. 11. Future Radio Access (5G) - Toward 2020 and Beyond - NTT DOCOMO, INC., Copyright 2013, All rights reserved. 11
  12. 12. Network/Communication Society in 2020 and Beyond Extension/enrichment of wireless services Everything Connected by Wireless Monitor/collect information & control devices Multiple personal devices Transportation (Car/Bus/Train) Deliver rich contents in real-time & ensure safety Video streaming New types of terminal/HI 4K Interaction across multiple devices Consumer electronics Entertainment, Navigation Traffic information Watch/jewelry/cloth s 4K/8K video resolutions Video on newspapers Background video Healthcare Human interface and healtchcare sensors Remote operation using personal terminal Education Remote health check & counseling House Sensors Cloud computing Remote control of facilities House security Smart power grid Agriculture and farming Factory automation Weather/Environment All kinds of services supported by the mobile personal cloud NTT DOCOMO, INC., Copyright 2013, All rights reserved. Glasses/Touch internet Distance (remote) learning Any lesson anywhere/anytime Safety and lifeline system Prevention of accidents Robustness to disasters 12
  13. 13. FRA concept and requirements Various requirements for network/communication society in 2020 and beyond Support for traffic explosion • 1000x capacity/km2 QoE for various applications Future Radio Access Massive device connectivity • 100x more connected devices • Lower overhead incl. reduced control signaling • Enhanced connectivity, e.g., deep inhouse • 10-100x data rates • Reduced latency to < 1ms • Support of high mobility • Terminal battery saving Intelligent network with low cost & high robustness • Very small/light BS with energy saving • Reduced network cost incl. backhaul • Efficient support for diverse environments incl. emergency cases FRA will provide a total solution to satisfy the requirements NTT DOCOMO, INC., Copyright 2013, All rights reserved. 13
  14. 14. Evolution paths for FRA • Further LTE enhancements – Macro-assisted small cell enhancement (Phantom cell) – Further general LTE enhancements • Potential new RAT Performance – Should prioritize the achievement of more big gains over backward compatibility – Consider new spectrum allocations of WRC-15 and beyond – Some technical components may be applied to further LTE enhancements LTE-Advanced LTE Macro-assisted small cell enhancement (Phantom cell) Rel-12/13 Rel-10/11 Rel-8/9 Pico/Femto CA/eICIC/CoMP for HetNet NTT DOCOMO, INC., Copyright 2013, All rights reserved. WRC-15 ~2015 Future Radio Access (= Future IMT = 5G?) Potential New RAT Big gain Rel-14/15,… Further LTE enhancements WRC-18/19 ~2020 Year 14
  15. 15. Directions of evolution: “The Cube” A set of radio access technologies is required to satisfy future requirements Required performance Spectrum efficiency Traffic offloading TRx TRx TRx WiFi TRx TRx TRx TRx TRx Non-orthogonal multiple access Controller 3D/Massive MIMO, Advanced receiver Network densification Current capacity Hotspot Dense urban Shopping mall Study for new interference scenarios Tx-Rx cooperative access technologies Spectrum extension Existing cellular bands Cellular network assists local area radio access Higher/wider frequency bands Very wide Super wide New cellular concept for cost/energyefficient dense deployments Frequency Efficient use of higher spectrum bands NTT DOCOMO, INC., Copyright 2013, All rights reserved. 15
  16. 16. FRA technical concept Combined usage of lower and higher frequency bands  Higher frequency bands become useful and beneficial! Existing cellular bands Higher frequency bands (high power density for coverage) (wider bandwidth for high data rate) Very wide (e.g. > 3GHz) Super wide (e.g. > 10GHz)  No coverage issue any more  Can provide very high throughput using wider bandwidth  Big offloading gain from existing cellular bands Frequency FRA technical concept Further cellular enhancements NTT DOCOMO, INC., Copyright 2013, All rights reserved. Exploitation of higher frequency bands 16
  17. 17. FRA Real-time Simulator  The potential performance gains of applying key FRA technologies are demonstrated using FRA real-time simulator.  Demo Scenario  Spectrum extension x NW densification • Efficient exploitation of higher frequency bands using small cells  Key technology for small cells • Massive MIMO  Key technology for macro cells • Non-orthogonal Multiple Access (NOMA) NTT DOCOMO, INC., Copyright 2013, All rights reserved. 17
  18. 18. FRA Real-Time Simulator Macro @ 2GHz (20MHz) + 12 small cells @ 3.5GHz (100MHz) w/ Raytracing @ Shinjuku, Tokyo NTT DOCOMO, INC., Copyright 2013, All rights reserved. 18
  19. 19. FRA Real-Time Simulator Macro @ 2GHz (20MHz) + 12 small cells @ 10 GHz (400MHz) w/ Raytracing @ Shinjuku, Tokyo NTT DOCOMO, INC., Copyright 2013, All rights reserved. 19
  20. 20. FRA Real-Time Simulator Macro @ 2GHz (20MHz) + 12 small cells @ 20 GHz (1GHz) w/ Raytracing @ Shinjuku, Tokyo NTT DOCOMO, INC., Copyright 2013, All rights reserved. 20
  21. 21. FRA Real-Time Simulator Macro @ 2GHz (20MHz) + 12 small cells @ 20 GHz (1GHz) + Massive MIMO w/ Raytracing @ Shinjuku, Tokyo NTT DOCOMO, INC., Copyright 2013, All rights reserved. 21
  22. 22. NTT DOCOMO, INC., Copyright 2013, All rights reserved. 23
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