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

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LTE-Advanced Enhancements and Future Radio Access Toward 2020

LTE-Advanced Enhancements and Future Radio Access Toward 2020

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 LTE-Advanced Enhancements and Future Radio Access Toward 2020 LTE-Advanced Enhancements and Future Radio Access Toward 2020 Presentation Transcript

  • 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
  • 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
  • 3GPP LTE Release 12 NTT DOCOMO, INC., Copyright 2013, All rights reserved. 3
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • Future Radio Access (5G) - Toward 2020 and Beyond - NTT DOCOMO, INC., Copyright 2013, All rights reserved. 11
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • NTT DOCOMO, INC., Copyright 2013, All rights reserved. 23