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LTE-Advanced Overview
LTE-Advanced Overview
LTE-Advanced Overview
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LTE-Advanced Overview

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  • 1. LTE-Advanced 주요 표준 동향 및 기술 윤영우 yw.yun@lge.com LG 전자
  • 2. Contents  Generals on LTE-Advanced  Overview of LTE-Advanced Technologies  More details on LTE-Advanced Component Technologies LTE-Advanced 주요 표준 동향 및 요소 기술 2
  • 3. LTE-Advanced : Generals  Definition of LTE-Advanced  Major milestones for LTE-Advanced  Requirements and targets for LTE-Advanced  Current status of LTE-Advanced  Self Evaluation Results  Bands identified for IMT-Advanced
  • 4. 3GPP specification releases Cited from 3GPP, RP-091005, Proposal for Candidate Radio Interface Technologies for IMT-Advanced Based on LTE Release 10 and Beyond 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 GSM/GPRS/EDGE enhancements Release 99 W-CDMA Release 4 1.28Mcps TDD Release 5 HSDPA, IMS Release 6 HSUPA, MBMS, IMS+ Release 7 HSPA+ (MIMO, HOM etc.) ITU-R M.1457 IMT-2000 Recommendations Release 8 LTE, SAE Release 9 Small LTE/SAE enhancements LTE-Advanced 주요 표준 동향 및 요소 기술 Release 10 LTE-Advanced
  • 5. Definitions  What is IMT-Advanced?  A family of radio access technologies fulfilling IMT-Advanced requirements  Relates to 4G as IMT-2000 relates to 3G  IMT spectrum will be available to both IMT-2000 and IMT-Advanced  What is LTE-Advanced?  System now under study in 3GPP aiming toward IMT-Advanced within WP5D time line  Formal name: Advanced E-UTRA /Advanced E-UTRAN  Evolution from 3GPP LTE specifications, not a revolution  Comparable potential of 3GPP LTE with target requirements of IMT-advanced  Fast and efficient correspondence against the timeline of WP5D’s specification and commercialization for IMT-advanced  Cost-efficient support for backward and forward compatibility between LTE and LTE-A  Natural evolution of LTE (LTE release 10 & beyond) LTE-Advanced 주요 표준 동향 및 요소 기술 5
  • 6. Detailed Timeline for ITU-R Detailed Timelines for ITU-R Steps 1- 4 RAN #39 RAN #40 RAN #41 RAN #42 RAN #43 RAN #44 RAN #45 RAN #46 RAN #47 3/08 6/08 9/08 12/08 3/09 5/09 9/09 12/09 3/10 3GPP 3GPP work on ITU-R Step 2 LTE-Advanced Technology Development LTE-Advanced SI Approved Specifications 3GPP LTE- 3GPP LTE- Advanced 3GPP LTE- LTE-Advanced Advanced Specifications Complete Advanced Final Early to ITU-R Technical Submission to Submission to ~ Jan 2011 Submission to ITU-R including ITU-R 3GPP work on ITU-R Step 3 [~Release 10 ] ITU-R Updated Technology Submission [~RAN #50 12/10] Technical Initiate Submission & 3GPP LTE- Required Self- Advanced Evaluation 3GPP Q&A with Self-Evaluation evaluation groups (as required) IMT-Advanced Evaluation Evaluation of INDUSTRY Group(s) ITU-R Submissions Formed (notify ITU-R) Steps 1 & 2 WP 5D #1 WP 5D #2 WP 5D #3 Circular Letter & Development of Candidate RITs WP 5D #6 ITU-R 3/08 6/08 10/08 3/08 to 10/09 10/09 ITU-R Circular Step 3 ITU-R Circular Letter 5/LCCE/2 Letter Addendum Submission ITU-R Eval Process & 5/LCCE/2 + 3/09 to 10/09 Evaluation Reports Timelines Requirements Criteria WP 5D #4 WP 5D #5 WP 5D #6 & Submission Templates 3/09 6/09 10/09 Cutoff for Evaluation Reports WP 5D #4 Step 4 to ITU-R Evaluations June 2010 3/09 1/09 to 6/10 6/10 5 Source: RP-080651 WP 5D #8 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 7. IMT-Advanced Process WP 5D 2008 2009 2010 2011 No.1 No.2 No.3 No.4 No.5 No.6 No.7 No.8 No.9 No.10 meetings Step1 and 2 (0) (20 months) Step 3 (8 months) (1) Step 4 (16 months) (2) Steps 5,6 and 7 (20 months) (3) Steps 8 (12 months) (4) Steps in radio interface development process: Step 1: Issuance of the circular letter Step 5: Review and coordination of outside evaluation activities Step 2: Development of candidate RITs and SRITs Step 6: Review to assess compliance with minimum requirements Step 3: Submission/Reception of the RIT and SRIT proposals Step 7: Consideration of evaluation results, consensus building and acknowledgement of receipt and decision Step 4: Evaluation of candidate RITs and SRITs Step 8: Development of radio interface Recommendation(s) by evaluation groups Critical milestones in radio interface development process: (0): Issue an invitation to propose RITs March 2008 (2): Cut off for evaluation report to ITU June 2010 (1): ITU proposed cut off for submission October 2009 (3): WP 5D decides framework and key October 2010 of candidate RIT and SRIT proposals characteristics of IMT-Advanced RITs and SRITs (4): WP 5D completes development of radio February 2011 interface specification Recommendations IMT-Advanced A2-01 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 8. Major Milestones for LTE-Advanced  Major milestones for LTE-Advanced in 3GPP  1st workshop in November 2007 – Cancun  Approval of LTE-Advanced study item: Rapporteur: NTT DoCoMo  2nd workshop in April 2008 – Shenzhen  3rd workshop in May 2008 – Prague  Approval of LTE-A requirement TR: TR 36.913 v8.0.0 approved in RAN#40 in May  Early proposal to ITU-R WP5D in October 2008  Complete submission to ITU-R in June 2009 (WP5D #5)  Approval for RAN TR (TR 36.912) for ITU-R submission in September, 2009  Final proposal update to ITU-R in October 2009 (WP5D #6)  Study item completion in March 2010  LTE-Advanced function block work items started in December, 2009, irrespective of completion for LTE-Advanced study item  Initial approval of LTE-A (Rel-10 specification) will be done in December, 2010  Functional freezing will be done at the same time in December next year  ASN.1 freezing is expected to be done in March or June 2011 Standard Roadmap 2009 2010 2011 2012 Complete Tech Final Submission Proposals ITU-R WP5D Evaluation Consensus Specification 3GPP LTE Rel.9 LTE Rel.10 [LTE Rel.11] [LTE Rel.12] LTE-A LTE-A SI LTE-A Functional Work Items Beyond LTE-A SI LTE-Advanced 주요 표준 동향 및 요소 기술
  • 9. Agreed upon Time Plan for Rel-10 12.09 3.10 6.10 9.10 12.10 3.11 6.11 #46 #47 #48 #49 #50 #51 #52 Expected RAN1 has to complete their Functional specification by Sept. 10 freeze (only 9 month) In RAN1 Core spec ASN.1 RAN2/3/4 have to completeFunctional freeze freeze their specification by Dec. 10 (only 12 month) reflecting RAN1 agreements LTE-Advanced 주요 표준 동향 및 요소 기술
  • 10. Documents Related to LTE-Advanced  TR (Technical Report)  TR 36.806  Technical report for relay architecture  TR 36.814 (RAN1 technical report)  Evolved Universal Terrestrial Radio Access (E-UTRA); Further advancements for E-UTRA Physical layer aspects  TR 36.815  LTE-Advanced feasibility studies in RAN WG4  TR 36.912 (RAN technical report)  Feasibility study for Further Advancements for E-UTRA (LTE- Advanced)  TR 36.913  Requirements for further advancements for Evolved Universal Terrestrial Radio Access (E-UTRA) LTE-Advanced 주요 표준 동향 및 요소 기술
  • 11. RAN TR for LTE-Advanced  TR 36.912: RAN plenary TR for LTE-Advanced study item  RP-090743: TR36.912 v9.0.0  Approved in RAN #45  Will be submitted to ITU-R after PCG approval  Contents 1. Scope 2. References 3. Definitions, symbols and abbreviations 4. Introduction 5. Support of wider bandwidth 6. Uplink transmission scheme 7. Downlink transmission scheme 8. CoMP 9. Relaying 10. Improvement for latency 11. Radio transmission and reception 12. Mobility enhancements 13. TS 36.133 requirements enhancements 14. MBMS enhancements 15. SON enhancements 16. Self-evaluation report on “LTE Rel.10 & beyond (LTE-Advanced)” Annexs LTE-Advanced 주요 표준 동향 및 요소 기술
  • 12. Requirements for LTE-Advanced [1]  General requirement  LTE-Advanced is an evolution of LTE  LTE-Advanced shall meet or exceed IMT-Advanced requirements within the ITU-R time plan  Extended LTE-Advanced targets are adopted LTE-Advanced targets Performance IMT-Advanced System requirements and time plan Rel. 8 LTE Time Cited from 3GPP, RP-091005, Proposal for Candidate Radio Interface Technologies for IMT-Advanced Based on LTE Release 10 and Beyond LTE-Advanced 주요 표준 동향 및 요소 기술
  • 13. Requirements for LTE-Advanced [2]  Comparison between IMT-Advanced and LTE-Advanced  LTE-Advanced should at least fulfill or exceed IMT-Advanced requirements ITU Requirement 3GPP Requirement 1Gbps in DL Peak data rates 500Mbps in UL Bandwidth 40MHz (scalable BW) Up to 100MHz User plane latency 10ms Improved compared to LTE Active  Active dormant(<10ms) Control plane latency 100ms Camped  Active (<50ms) 15bps/Hz in DL 30bps/Hz in DL Peak spectrum efficiency 6.75bps/Hz in UL 15bps/Hz in UL Average spectrum efficiency Set for four scenarios and several antenna configurations See next slide for case 1 requirement Cell edge spectrum effciency VoIP capacity Up to200 UEs per 5MHz Improved compared to LTE LTE-Advanced 주요 표준 동향 및 요소 기술
  • 14. Requirements for LTE-Advanced [3]  System performance requirements for IMT-Advanced ITU system performance requirement Base Rural/ Enviromnet Indoor Micro-cell coverage Urban High speed DL 3 2.6 2.2 1.1 Spectrum (4x2 MIMO) Efficiency UL 2.25 1.8 1.4 0.7 (2x4 MIMO) DL Cell Edge 0.1 0.075 0.06 0.04 (4x2 MIMO) Spectrum UL Efficiency 0.07 0.05 0.03 0.015 (2x4 MIMO) LTE-Advanced 주요 표준 동향 및 요소 기술
  • 15. Requirements for LTE-Advanced [4]  System Performance Requirements from TR 36.913  Peak Spectral Efficiency:  DL 30bits/Hz (8x8 MIMO), UL 15bps/Hz (4x4 MIMO)  Seem to be easily achievable by means of extended utilization of # of antennas  Average Spectral Efficiency (SE) and Edge Spectral Efficiency for LTE Case-1  System performances of LTE Rel-8 are about 30% ~ 70% lower than 3GPP target  What would be key enabling technologies to fill up the gap between two? LTE LTE-ADV LTE LTE-ADV Case-1 Cell Avg. SE Cell Avg. SE Cell Edge SE Cell Edge SE [bps/Hz/cell] [bps/Hz/cell] [bps/Hz/user] [bps/Hz/user] Ant. Config (3GPP R1-072580) (3GPP TR36.913) (3GPP R1-072580) (3GPP TR36.913) 1x2 0.735 1.2 0.024 0.04 UL 2x4 - 2.0 - 0.07 2x2 1.69 2.4 0.05 0.07 DL 4x2 1.87 2.6 0.06 0.09 4x4 2.67 3.7 0.08 0.12 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 16. Frequency Bands Identified for LTE-A  WRC 07 identified some new IMT spectrum that is now under band planning  There should be either a clear FDD band plan or TDD band plan Existing IMT identified New Global 5150 450 790 806 890915 470 698 925960 New 100 200 300 400 500 600 700 800 900 1000 Region 2 New for IMT in some countries of Regions 1 & 3 1710 2025 2110 2690 2170 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3300 3400 3500 3600 3700 3800 3900 4000 4100 4200 4300 4400 4500 4600 4700 4800 4900 5000 IMT bands can be used by all IMT-2000 and IMT-Advanced technologies LTE-Advanced 주요 표준 동향 및 요소 기술
  • 17. Current Status of LTE-Advanced  Status related to IMT-Advanced submission  Early proposal in October 2008  Main purpose was to inform ITU-R of 3GPP’s resolution for IMT-Advanced and provide updated status of LTE-Advanced to ITU-R  Complete technology submission in June 2009  Initial proposal submission from 3GPP  Compliant with the formal form of submissition requested by ITU-R  Separate RIT for FDD and TDD  Performance results were not included in the submission  Final submission in October 2009  Final proposal update to ITU-R  Self evaluation results for LTE-Advanced were included  Status of LTE-Advanced in 3GPP  Study item has been formally completed in last RAN plenary meeting in March  Several new work items with respect to LTE-Advanced were created, targetting Rel’10 time frame  Carrier aggregation work item: created in December 2009  Enhanced DL MIMO work item: created in December 2009  UL MIMO work item: created in December 2009  Relay work item: created in December 2009  Enhanced ICIC for non-ca based HetNet: created in March 2010 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 18. Self-Evaluation Activities in 3GPP  RAN1 activities with respect to self evaluations for LTE-Advanced  List of companies who submitted self evaluation results:  Alcatel-Lucent, CATT, CMCC, Ericsson, Fujitsu, Hitachi, Huawei, LGE, Motorola, NEC, Nokia, NTT DOCOMO, Panasonic, Qualcomm, RITT, Samsung, Texas Instruments, ZTE  How to capture self evaluation results from a lot of companies  Since different companies have somewhat different assumptions on the overhead, the group had to make decision on the common assumption for the overhead so that the results from different companies can be comparable with each other  What kinds of features should be prioritized?  LTE-Advanced is based on LTE Rel.8 and it is the long term evolution of LTE, thus  It is good to inform that LTE Rel.8 can fulfill the most of requirements without any enhanced techniques.  It is also good to inform that only small updates from Rel.8 can fulfill the requirements even in the very tough conditions (UMi and Uma).  Thus, Rel-8 performance is captured if it fulfills the requirements.  If Rel-8 cannot meet the req. , we should prioritize ones with small extension from Rel-8, i.e.,  DL: Rel-8 > MUMIMO > CS/BF-CoMP and JP-CoMP  UL: Rel-8 > MUMIMO, SUMIMO and CoMP LTE-Advanced 주요 표준 동향 및 요소 기술
  • 19. Summary of Self-Evaluation Results  From the self evaluation activities, it was found that  For LTE Release 10,  FDD RIT Component meets the minimum requirements of all 4 required test environments  TDD RIT Component meets the minimum requirements of all 4 required test environments  The complete SRIT meets the minimum requirements of all 4 required test environments.  Baseline configuration exceeding ITU-R requirements with minimum extension  LTE release 8 fulfills the requirements in most cases (no extensions needed)  Extensions to Multi-user MIMO from Release 8 fulfills the requirements in some scenarios (Urban Macro/Micro DL)  More advanced configurations, e.g. CoMP, with further enhanced performance  Many (18) companies perticipated in the simulations, ensuring high reliability  Self evaluation reports are captured in section 16 of Technical Report TR 36.912 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 20. Self-Evaluation Results [1]  Peak spectrum efficiency  DL peak spectrum efficiency FDD spectral efficiency TDD spectral efficiency Scheme (bps/Hz) (bps/Hz) ITU requirement 15 15 Rel-8 4 layer spatial multiplexing 16.3 16.0 8 layer spatial multiplexing 30.6 30.0  UL peak spectrum efficiency FDD spectral efficiency TDD spectral efficiency Scheme (bps/Hz) (bps/Hz) ITU requirement 6.75 6.75 2 layer spatial multiplexing 8.4 8.1 4 layer spatial multiplexing 16.8 16.1 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 21. Self-Evaluation Results [2]  Indoor Hotspot / downlink / FDD  LTE Rel-8 meets the requirement ITU Number Cell average Cell edge Scheme and antenna requirement of conf. (Ave./Edge) samples L=1 L=2 L=3 L=1 L=2 L=3 Rel-8 SU-MIMO 3 / 0.1 15 4.8 4.5 4.1 0.23 0.21 0.19 4X2 (A) MU-MIMO 3 / 0.1 3 6.6 6.1 5.5 0.26 0.24 0.22 4X2 (C)  Indoor Hotspot / downlink / TDD  LTE Rel-8 meets the requirement ITU Number Cell average Cell edge Scheme and antenna requirement of conf. (Ave./Edge) samples L=1 L=2 L=3 L=1 L=2 L=3 Rel-8 SU-MIMO 3 / 0.1 10 4.7 4.4 4.1 0.22 0.20 0.19 4X2 (A) MU-MIMO 3 / 0.1 4 6.5 6.1 5.7 0.23 0.22 0.20 4X2 (C) LTE-Advanced 주요 표준 동향 및 요소 기술
  • 22. Self-Evaluation Results [3]  Indoor Hotspot / uplink / FDD  LTE Rel-8 meets the requirement ITU requirement Number of Scheme and antenna conf. Cell average Cell edge (Ave./Edge) samples Rel-8 SIMO 1X4 (A) 2.5 / 0.07 13 3.3 0.23 Rel-8 SIMO 1X4 (C) 2.5 / 0.07 10 3.3 0.24 Rel-8 MU-MIMO 1X4 (A) 2.5 / 0.07 2 5.8 0.42 SU-MIMO 2X4 (A) 2.5 / 0.07 5 4.3 0.25  Indoor Hotspot / uplink / TDD  LTE Rel-8 meets the requirement ITU requirement Number of Scheme and antenna conf. Cell average Cell edge (Ave./Edge) samples Rel-8 SIMO 1X4 (A) 2.5 / 0.07 9 3.1 0.22 Rel-8 SIMO 1X4 (C) 2.5 / 0.07 7 3.1 0.23 Rel-8 MU-MIMO 1X4 (A) 2.5 / 0.07 2 5.5 0.39 SU-MIMO 2X4 (A) 2.5 / 0.07 2 3.9 0.25 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 23. Self-Evaluation Results [4]  Urban Micro/downlink/FDD:Single cell MU-MIMO meets the requirement ITU Number Cell average Cell edge Scheme and antenna requirement of conf. L=1 L=2 L=3 L=1 L=2 L=3 (Ave./Edge) samples MU-MIMO 4X2 (C) 2.6 / 0.075 8 3.5 3.2 2.9 0.11 0.096 0.087 MU-MIMO 4X2 (A) 2.6 / 0.075 3 3.4 3.1 2.8 0.12 0.11 0.099 CS/BF-CoMP 4X2 (C) 2.6 / 0.075 5 3.6 3.3 3.0 0.11 0.10 0.089 JP-CoMP 4X2 (C) 2.6 / 0.075 1 4.5 4.1 3.7 0.14 0.13 0.12 MU-MIMO 8X2 (C/E) 2.6 / 0.075 4 4.2 3.8 3.5 0.15 0.14 0.13  Urban Micro/downlink/TDD: single cell MU-MIMO (4x2) meets the requirement ITU Number Cell average Cell edge Scheme and antenna requirement of conf. L=1 L=2 L=3 L=1 L=2 L=3 (Ave./Edge) samples MU-MIMO 4X2 (C) 2.6 / 0.075 8 3.4 3.2 3.0 0.10 0.096 0.089 MU-MIMO 4X2 (A) 2.6 / 0.075 1 3.1 2.9 2.7 0.11 0.10 0.095 CS/BF-CoMP 4X2 (C) 2.6 / 0.075 3 3.5 3.3 3.1 0.099 0.092 0.086 JP-CoMP 4X2 (C) 2.6 / 0.075 1 4.5 4.2 3.9 0.098 0.092 0.085 MU-MIMO 8X2 (C/E) 2.6 / 0.075 4 4.1 3.9 3.6 0.11 0.11 0.10 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 24. Self-Evaluation Results [5]  Urban Micro / uplink / FDD: LTE Rel-8 meets the requirement ITU requirement Number of Scheme and antenna conf. Cell average Cell edge (Ave./Edge) samples Rel-8 SIMO 1X4 (C) 1.8 / 0.05 13 1.9 0.072 Rel-8 MU-MIMO 1X4 (A) 1.8 / 0.05 2 2.5 0.077 MU-MIMO 2X4 (A) 1.8 / 0.05 1 2.5 0.086  Urban Micro / uplink / TDD: LTE Rel-8 meets the requirement ITU requirement Number of Scheme and antenna conf. Cell average Cell edge (Ave./Edge) samples Rel-8 SIMO 1X4 (C) 1.8 / 0.05 9 1.9 0.070 Rel-8 MU-MIMO 1X4 (A) 1.8 / 0.05 2 2.3 0.071 MU-MIMO 2X4 (A) 1.8 / 0.05 1 2.8 0.068 MU-MIMO 1X8 (E) 1.8 / 0.05 1 3.0 0.079 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 25. Self-Evaluation Results [6]  Urban Macro / downlink / FDD: Single cell MU-MIMO (4x2) meets the requirement ITU Number Cell average Cell edge Scheme and antenna requirement of conf. L=1 L=2 L=3 L=1 L=2 L=3 (Ave./Edge) samples MU-MIMO 4X2 (C) 2.2 / 0.06 7 2.8 2.6 2.4 0.079 0.073 0.066 CS/BF-CoMP 4X2 (C) 2.2 / 0.06 6 2.9 2.6 2.4 0.081 0.074 0.067 JP-CoMP 4X2 (A) 2.2 / 0.06 1 3.0 2.7 2.5 0.080 0.073 0.066 CS/BF-CoMP 8X2 (C) 2.2 / 0.06 3 3.8 3.5 3.2 0.10 0.093 0.085  Urban Macro / downlink / TDD: Single cell MU-MIMO (4x2) meets the requirement ITU Number Cell average Cell edge Scheme and antenna conf. requirement of (Ave./Edge) samples L=1 L=2 L=3 L=1 L=2 L=3 MU-MIMO 4X2 (C) 2.2 / 0.06 7 2.8 2.6 2.4 0.076 0.071 0.067 CS/BF-CoMP 4X2 (C) 2.2 / 0.06 4 2.8 2.6 2.4 0.082 0.076 0.071 JP-CoMP 4X2 (C) 2.2 / 0.06 1 3.5 3.3 3.1 0.087 0.082 0.076 CS/BF-CoMP 8X2 (C/E) 2.2 / 0.06 3 3.5 3.3 3.1 0.10 0.093 0.087 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 26. Self-Evaluation Results [7]  Urban Macro / uplink / FDD  LTE Rel-8 meets the requirement ITU requirement Number of Scheme and antenna conf. Cell average Cell edge (Ave./Edge) samples Rel-8 SIMO 1X4 (C) 1.4 / 0.03 12 1.5 0.062 CoMP 1X4 (A) 1.4 / 0.03 2 1.7 0.086 CoMP 2X4 (C) 1.4 / 0.03 1 2.1 0.099  Urban Macro / uplink / TDD  LTE Rel-8 meets the requirement ITU requirement Number of Scheme and antenna conf. Cell average Cell edge (Ave./Edge) samples Rel-8 SIMO 1X4 (C) 1.4 / 0.03 9 1.5 0.062 CoMP 1X4 (C) 1.4 / 0.03 1 1.9 0.090 CoMP 2X4 (C) 1.4 / 0.03 1 2.0 0.097 MU-MIMO 1X8 (E) 1.4 / 0.03 1 2.7 0.076 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 27. Self-Evaluation Results [8]  Rural Macro / downlink / FDD: LTE Rel-8 meets the requirement ITU Number Cell average Cell edge Scheme and antenna conf. requirement of (Ave./Edge) samples L=1 L=2 L=3 L=1 L=2 L=3 Rel-8 SU-MIMO 4X2 (C) 1.1 / 0.04 15 2.3 2.1 1.9 0.081 0.076 0.069 Rel-8 SU-MIMO 4X2 (A) 1.1 / 0.04 14 2.1 2.0 1.8 0.067 0.063 0.057 MU-MIMO 4X2 (C) 1.1 / 0.04 3 3.9 3.5 3.2 0.11 0.099 0.090 MU-MIMO 8X2 (C) 1.1 / 0.04 1 4.1 3.7 3.4 0.13 0.12 0.11  Rural Macro / downlink / TDD: LTE Rel-8 meets the requirement ITU Number Cell average Cell edge Scheme and antenna conf. requirement of (Ave./Edge) samples L=1 L=2 L=3 L=1 L=2 L=3 Rel-8 SU-MIMO 4X2 (C) 1.1 / 0.04 8 2.0 1.9 1.8 0.072 0.067 0.063 Rel-8 SU-MIMO 4X2 (A) 1.1 / 0.04 7 1.9 1.7 1.6 0.057 0.053 0.049 MU-MIMO 4X2 (C) 1.1 / 0.04 4 3.4 3.2 3.0 0.095 0.089 0.083 MU-MIMO 8X2 (C/E) 1.1 / 0.04 2 3.9 3.6 3.4 0.11 0.11 0.10 Rel-8 single-layer BF 8X2 (E) 1.1 / 0.04 4 2.4 2.3 2.1 0.11 0.10 0.093 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 28. Self-Evaluation Results [9]  Rural Macro / uplink / FDD: LTE Rel-8 meets the requirement ITU requirement Number of Scheme and antenna conf. Cell average Cell edge (Ave./Edge) samples Rel-8 SIMO 1X4 (C) 0.7 / 0.015 11 1.8 0.082 Rel-8 MU-MIMO 1X4 (A) 0.7 / 0.015 2 2.2 0.097 CoMP 2X4 (A) 0.7 / 0.015 2 2.3 0.13  Rural Macro / uplink / TDD: LTE Rel-8 meets the requirement ITU requirement Number of Scheme and antenna conf. Cell average Cell edge (Ave./Edge) samples Rel-8 SIMO 1X4 (C) 0.7 / 0.015 8 1.8 0.080 Rel-8 MU-MIMO 1X4 (A) 0.7 / 0.015 2 2.1 0.093 CoMP 2X4 (A) 0.7 / 0.015 1 2.5 0.15 MU-MIMO 1X8 (E) 0.7 / 0.015 1 2.6 0.10 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 29. Self-Evaluation Results [10]  VoIP capacity: Rel-8 LTE meets all the requirements FDD TDD Antenna ITU Scenarios conf. requirement Number of Capacity Number of Capacity samples (user/MHz/cell) samples (user/MHz/cell) Indoor Hotspot 50 3 140 2 137 Urban Micro 40 3 80 2 74 (A) Urban Macro 40 3 68 2 65 Rural Macro 30 3 91 2 86 Indoor Hotspot 50 3 131 3 130 Urban Micro 40 3 75 3 74 (C) Urban Macro 40 3 69 3 67 Rural Macro 30 3 94 3 92 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 30. Self-Evaluation Results [11]  Mobility Traffic Channel Link Data Rates  Rel-8 LTE can meet all the requirements FDD TDD Median LOS/ ITU Scenarios SINR UL spectrum UL spectrum NLOS requirement Number of Number of (dB) efficiency efficiency samples samples (bps/Hz) (bps/Hz) Indoor Hotspot 1.0 13.89 7 2.56 4 2.63 Urban Micro 0.75 4.54 7 1.21 4 1.14 Antenna conf. 1X4, NLOS Urban Macro 0.55 4.30 7 1.08 4 0.95 Rural Macro 0.25 5.42 7 1.22 4 1.03 Indoor Hotspot 1.0 13.89 4 3.15 2 3.11 Urban Micro 0.75 4.54 4 1.42 2 1.48 Antenna conf. 1X4, LOS Urban Macro 0.55 4.30 4 1.36 2 1.36 Rural Macro 0.25 5.42 4 1.45 2 1.38 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 31. Overview of LTE-Advanced Technologies  Outlining of candidate technologies for LTE-Advanced  LTE enhancement areas for LTE-Advanced  Emerging technology areas for LTE-Advanced
  • 32. Outline of Candidate Technologies for LTE-A  Emerging technologies for LTE-Advanced  Multi-hop transmission (relay)  Multi-cell cooperation (CoMP: Cooperative Multipoint Tx/Rx)  Heterogeneous cell overlay  Self-organizing network  Enhancements from LTE Rel-8/9  Bandwidth/spectrum aggregation  Contiguous and non-contiguous  Control channel design for UL/DL  MIMO enhancement  Extended utilization of antennas (increasing the number of layers)  UL SU-MIMO  Enhanced UL/DL MU-MIMO  Hybrid multiple access scheme for UL  Clustered SC-FDMA in addition to SC-FDMA  DL/UL Inter-cell Interference Management LTE-Advanced 주요 표준 동향 및 요소 기술
  • 33. LTE Enhancement Areas for LTE-Advanced Spectrum Aggregation Advanced MIMO High-order MIMO UL SU-MIMO Enhanced DL/UL MU-MIMO FFR & Power Control UL Hybrid Multiple Access Power Spectral Density : mapping to a RB Sector 1 A B Cluster C D Frequency Sector 2 A C Modulation Time Domain B D symbols S/P IFFT signal DFT P/S Sector 3 A D B C Reuse 1 Reuse 1/3 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 34. Emerging Technologies for LTE-Advaced Multihop Transmission (Relay) Multi-cell Cooperation (Collaborative MIMO) Self Organizing Network (SON) Heterogeneous Cell Overlay Mobile Core Network Macro eNB Femto-cell Controller X2 Pico eNB Relay eNB Femto eNB Interne t LTE-Advanced 주요 표준 동향 및 요소 기술
  • 35. LTE-Advanced Improvements  A schematic view on LTE-Advanced improvements LTE-Advanced Data rate Spectrum Higher Order Aggregation MIMO LTE CoMP Coverage Extension HeNB/Relay CoMP SON eNodeB LTE-Advanced 주요 표준 동향 및 요소 기술
  • 36. Spectrum and Carrier Aggregation  Motivation  Higher data rate support in wider bandwidth  LTE-Advanced should extend up to 100MHz  Backward compatible co-existence with LTE and LTE-A in IMT carrier bands  Aggregation of muliple component carriers into overall wider bandwidth  Each component carrier can appear as LTE carrier to LTE UE  Two types of aggregation  Case 1: Contiguous BW aggregation  Case 2: Non-contiguous BW aggregation  Aggregated allocation of contiguous  Aggregated allocation of separated carrier carrier BWs BWs  Need of further clarification for  Need of further clarification for spectrum feasibility of contiguous BW allocation range of BW aggregation up to 100MHz  Contiguos carrier aggregaion in a same frequency band  Maybe difficult to find out frequency bands where maximum of 200MHz (FDD) can be allocated in contiguos manner  Non-contiguous carrier aggregation in different frequency band  Possibility for wider total bandwidth without correspondingly wider contiguous spectum  Feasibility, complexity and cost analysis should be done in RAN4 WG LTE-Advanced 주요 표준 동향 및 요소 기술 36
  • 37. MIMO Enhancement for LTE-Advanced  DL MIMO enhancements  Design issues  8 Tx antennas  RS structure to support 8 Tx antennas  DM RS  CSI RS  # of codewords  Codebook design  Tx diversity in case of 8 Tx antennas  MU-MIMO enhancement scheme  UL MIMO enhancements  Design issues  UL SU-MIMO transmission  Up to 4Tx antenna  Reference signal design  Number of codewords  Tx diversity  UL MU-MIMO enhancement LTE-Advanced 주요 표준 동향 및 요소 기술
  • 38. Uplink Multiple Access  Motivation  Problems of SC-FDMA  PAPR/CM gain is not so crucial for UE without power limitation problem : mapping to a RB  Restricted flexibility due to “single- carrier property” in scheduling and Modulation control channel design Symbols DFT S/P RE IFFT P/S Time-domain signal  However, low PAPR/CM of SC- for TrBlk A Clustered- mapping FDMA at power-limited situation is DFTsOFDM still very important  Uplink Hybrid Multiple Access of Modulation S/P IFFT Clustered SC-FDMA and SC- Symbols for TrBlk B DFT RE mapping P/S Time-domain signal FDMA Clustered- DFTsOFDM  Clustered SC-FDMA transmission for more flexible scheduling  Non-contiguous resource allocation Modulation S/P IFFT Symbols DFT RE Time-domain should also be supported for for TrBlk C mapping P/S signal PUSCH transmission from UE with Clustered- DFTsOFDM sufficient amount of power headroom both in absence and presence of spatial multiplexing  SC-FDMA transmission for power-limited UEs  Support of low PAPR/CM property LTE-Advanced 주요 표준 동향 및 요소 기술
  • 39. Relay [1]  Several types of data transmission between eNB and UE Out of focus in LTE-Advanced study UE Relaying Conventional UE-eNB Tx/Rx • Direct inter-UE connectivity • Conventional single-hop Tx/Rx between UE • Autonomous ad-hoc network configuration and eNB as a basic connection scheme and management • Support of emergency call status Wireless link eNB connection Relay Node Relay Node Relay Node Tx/Rx • Remote relay node Tx/Rx • Coverage extension and throughput enhancement Main focus in LTE-Advanced study LTE-Advanced 주요 표준 동향 및 요소 기술
  • 40. Relay [2]  Exemplary use case for relay LTE-Advanced 주요 표준 동향 및 요소 기술
  • 41. CoMP [1]  CoMP stands for coordinated multipoint transmission  CoMP in Rel-10 time frame  Agreed not to pursue standardized CoMP solution at least during Rel-10 time frame  However, new study item for CoMP was created during last RAN plenary meeting in March LTE-Advanced 주요 표준 동향 및 요소 기술
  • 42. CoMP [2]  CoMP categories under consideration  Joint Processing  Data is available at each point in CoMP cooperating set  Joint Transmission  Dynamic Cell Selection  Coordinated Scheduling/Beamforming (CS/CB)  Data is only available at serving cell LTE-Advanced 주요 표준 동향 및 요소 기술
  • 43. CoMP [3]  Joint Transmission  Data to a single UE is available at multiple transmission points  PDSCH transmission from multiple points (part of or entire CoMP cooperating set) at a time  Coherently or non-coherently  To improve the received signal quality and/or cancel actively interference for other UEs  Dynamic Cell Selection  CoMP transmission point from a single point  Can change dynamically within the CoMP cooperating set.  Cooperative Scheduling/ Beamforming (CS/CB)  Data is only available at serving cell  User scheduling/beamforming decisions are made with coordination among the CoMP cooperating set.  CoMP transmission point : serving cell LTE-Advanced 주요 표준 동향 및 요소 기술
  • 44. More Details on LTE-Advanced Component Technologies  Spectrum and carrier aggregation  Relay  Enhanced DL MIMO  UL MIMO  CoMP
  • 45. Spectrum and carrier aggregation  Overview  Carrier Types  MAC-PHY interface  Uplink Multiple Access  Uplink Control Channel  Downlink Control Channel  UL Power control
  • 46. Overview [1]  Carrier aggregation  Support wider bandwidth  Two or more component carriers  Up to 100MHz and for spectrum aggregation  Each component carrier limited to a maximum of 110 RBs  Using Rel’8 numerology  Carrier aggregation type  Contiguous  Non-contiguous LTE/MIMO 표준기술 표준 동향 및 요소 기술 LTE-Advanced 주요 46
  • 47. Overview [2]  Concept of carrier aggregation Contiguous component carrier LTE bandwidth Frequency Non-contiguous component carrier Aggregated bandwidth Frequency LTE-Advanced 주요 표준 동향 및 요소 기술
  • 48. Overview [3]  Deployment scenarios in RAN4  Intraband contiguous CA  Originally, intraband contiguous CA scenario was proposed only for TDD, but it was agreed also for FDD afterwards for the sole reason of satisfying ITU-R requirement Uplink (UL) band Downlink (DL) band E-UTRA E-UTRA Duple UE transmit / BS receive UE receive / BS transmit CA operating Channel Channel x Band Band BW MHz FDL_low (MHz) – FDL_high BW MHz mode FUL_low (MHz) – FUL_high (MHz) (MHz) CA_40 40 2300 – 2400 [TBD] 2300 – 2400 [TBD] TDD CA_1 1 1920 – 1980 [TBD] 2110 – 2170 [TBD] FDD LTE-Advanced 주요 표준 동향 및 요소 기술
  • 49. Overview [4]  Interband non-contiguous CA Uplink (UL) band Downlink (DL) band E-UTRA E-UTRA Duple UE transmit / BS receive UE receive / BS transmit CA operating Channel Channel x Band Band BW MHz FDL_low (MHz) – FDL_high BW MHz mode FUL_low (MHz) – FUL_high (MHz) (MHz) 1 1920 – 1980 [TBD] 2110 – 2170 [TBD] CA_1-5 FDD 5 824 – 849 [TBD] 869 – 894 [TBD]  TBD bandwidth will be finally decided after having RAN4 discussion LTE-Advanced 주요 표준 동향 및 요소 기술
  • 50. Overview [5]  UE capability regarding carrier aggregation  LTE-A UE  Simultaneous transmission/reception on multiple component carrier  Depends on the transmission/reception capability  Rel’8 UE  Transmission on a single component carrier only  Characteristics of component carrier  It shall be possible to configure all component carriers LTE Release 8 compatible at least when the aggregated numbers of component carriers in the UL and the DL are same  Consideration of non-backward-compatible configurations of LTE-A component carriers is not precluded (CC only for LTE-A) System bandwidth, CC, e.g., 20 MHz e.g., 100 MHz Frequency UE capabilities • 100-MHz case • 40-MHz case • 20-MHz case (Rel. 8 LTE) LTE-Advanced 주요 표준 동향 및 요소 기술
  • 51. Carrier Types  Backward compatible carrier A carrier accessible to UEs of all existing LTE releases  Can be operated as a single carrier (stand-alone) or as a part of carrier aggregation  For FDD, backwards compatible carriers always occur in pairs, i.e. DL and UL  Non-backward compatible carrier A carrier not accessible to UEs of earlier LTE releases  Can be operated as a single carrier (stand-alone) from the duplex distance  Otherwise, as a part of carrier aggregation LTE-Advanced 주요 표준 동향 및 요소 기술
  • 52. MAC-PHY Interface  From a UE perspective  There is one transport block (in absence of spatial multiplexing)  One hybrid-ARQ entity per scheduled component carrier.  Each transport block is mapped to a single component carrier  A UE may be scheduled over multiple component carriers simultaneously. transport block transport block Channel Channel coding coding Modulation Modulation RB mapping RB mapping Component carrier 1 Component carrier 2 20MHz 20MHz One UE LTE-Advanced 주요 표준 동향 및 요소 기술
  • 53. Uplink Multiple Access  SC-FDMA for PUSCH  One DFT per component carrier : mapping to a RB  Supported for spatial multiplexing Modulation S/P IFFT Time-domain  Resource allocation Symbols for TrBlk A DFT Clustered- DFTsOFDM RE mapping P/S signal  Frequency-contiguous  Frequency-non-contiguous Modulation Symbols DFT S/P RE IFFT P/S Time-domain signal for TrBlk B mapping Clustered- DFTsOFDM Modulation S/P Symbols DFT RE IFFT Time-domain for TrBlk C mapping P/S signal Clustered- DFTsOFDM  Uplink multiplexing of L1/L2 control signalling and data  Control signalling is transmitted on PUCCH simultaneously with data on PUSCH  Control signalling is multiplexed with data on PUSCH according to the same principle as in Rel-8 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 54. Uplink Control Channel  PUCCH design  Rel’10 design supports up to 5 DL CC  Consider extendability to larger number of DL CC in the future  All ACK/NACK for a UE can be transmitted on PUCCH in absence of PUSCH transmission  Simultaneous A/N on PUCCH transmission from 1 UE on multiple UL CCs is not supported  A single UE-specific UL CC is configured semi-statically for carrying PUCCH A/N  Method for assigning PUCCH resource(s) for a UE on the above single UL carrier in case of carrier aggregation  Implicit / Explicit / Hybrid: FFS  Note that for a CA-capable UE that is configured for single UL/DL carrier-pair operation , single-antenna PUCCH resource assignment shall be done as per Rel-8.  A single UE-specific UL CC is configured semi-statically for carrying PUCCH A/N, SR, and periodic CSI from a UE  Concept of primary carrier LTE-Advanced 주요 표준 동향 및 요소 기술
  • 55. Uplink Control Channel  One SR per UE transmitted on PUCCH  Semi-statically mapped onto one UE specific UL CC  Periodic CSI reporting for up to 5 DL CC supported  Semi-statically mapped onto one UE specific UL CC  Following Rel8 principles for CQI/PMI/RI  Consider ways to reduce reporting overhead, e.g. DL CC cycling  Consider ways to support extending CSI payload LTE-Advanced 주요 표준 동향 및 요소 기술
  • 56. Uplink Control Channel  Further discussion points for ACK/NACK transmission  Method(s) for A/N multiplexing  How many simultaneous PUCCH signals?  PUCCH format 1b with SF reduction to 2 or 1  Channel selection with appropriate modification  PUCCH format 2  New PUCCH signal/format (e.g. DFT-S-OFDM based)  A/N bundling within / across CCs  Also consider TDD H H H H H H H H H C C C C C C C C C S S S S S S S S S D D D D D D D D D P P P P P P P P P A/N A/N A/N H A/N H H H H A/N H A/N H H A/N H A/N H A/N Joint coding C C C C C C C C Bundling C C C C C C C C C C C C U U U U U U U U U U P P P P P P P P P P Multiple resources transmission Bundling Joint coding LTE-Advanced 주요 표준 동향 및 요소 기술
  • 57. Uplink Control Channel  CQI (Channel Quality Indication)  Multiple CQIs on single component carrier  Multiple resources transmission  Joint coding  TDM DL CC #0 DL CC #1 DL CC #2 DL CC #0 DL CC #1 DL CC #2 H CQI H H H H CQI H CQI CQI CQI CQI C C C C C C H H C C C C C C C C Joint coding U U U U U U C C P P P P P P U U DL CC #0 DL CC #1 DL CC #2 P P H H Multiple resources transmission CQI C C CQI C C CQI U P U P Joint coding subframe #n Time H H C C C C U U P P subframe #n+1 H H C C C C U U P P subframe #n+2 TDM LTE-Advanced 주요 표준 동향 및 요소 기술
  • 58. Downlink Control Channel  PDCCH structure  PDCCH is transmitted within one component carrier  Mapping of PDCCH information  Separate coding of DL/UL scheduling for each component carrier  Based on DCI format(s) for single carrier  Linked carrier scheduling w/o CIF (carrier indicator field)  Rel’8 PDCCH structure and DCI formats  Cross carrier scheduling with CIF  Rel’8 DCI formats extended with 3 bit carrier indicator field  Reusing Rel’8 PDCCH structure  Solutions to PCFICH detection errors on the CC carrying PDSCH to be standardized  PDCCH blind decoding reduction is desirable CC#1 CC#2 CC#1 CC#2 CFI correct CFI error CFI correct CFI error PDCCH correct PDCCH DTX PDCCH PDCCH correct correct PDSCH error due to CFI error, also leads to Receive PDSCH Not receive PDSCH Receive PDSCH HARQ buffer corruption. Linked Carrier Scheduling Cross Carrier Scheduling LTE-Advanced 주요 표준 동향 및 요소 기술
  • 59. Downlink Control Channel  Linkage between PDSCH/PUSCH and PDCCH  Further discussion required on whether at least the following is supported:  A UE only monitors PDCCH on one DL CC for each PDSCH/PUSCH CC  For any DL carrier with CIF where the UE monitors PDCCH, PDCCH on the DL carrier shall be able to schedule PDSCH at least on the same carrier and/or PUSCH on a linked UL carrier  Further discussion required on whether this can be extended to support modified Option 1 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 60. Downlink Control Channel  PHICH transmission  Re-use PHICH physical transmission aspects from Rel’8  Orthogonal code design, modulation, scrambling sequence, mapping to REs  PHICH transmitted only on the ‘DL CC used to transmit the UL grant’  PHICH resource mapping rules:  For 1-to-1 or many-to-1 mapping between DL and UL without CIF  Reuse Rel’8 mapping  For many-to-1 UL:DL mapping or many-to-1 mapping between DL and UL with CIF  Single set of PHICH resources shared by all UEs (Rel-8 to Rel-10)  DM RS cyclic shift mechanism remains available and can be used to reduce collision probability  Working assumption to be confirmed at RAN1#60bis if no fundamental problem identified:  Further discussion point  Additional standardised mechanism for handling PHICH collisions needed? LTE-Advanced 주요 표준 동향 및 요소 기술
  • 61. Downlink Control Channel  PCFICH  Independent control region size per CC  On any carrier with a control region, re-use Rel’8 design  Modulation  Coding  RE mapping  PCFICH for cross-CC scheduling  In case of cross carrier scheduling, a standardized solution will be supported to provide CFI to the UE for the carriers on which PDSCH is assigned LTE-Advanced 주요 표준 동향 및 요소 기술
  • 62. Uplink Power Control  Assume similar operation of Rel’8:  Mainly compensate for slow-varying channel conditions while reducing the interference generated towards neighboring cells  Fractional PC or full path-loss compensation is used on PUSCH and full path- loss compensation on PUCCH  Supports component carrier specific UL PC for both contiguous and non-contiguous CC aggregation  Which PC parameters are CC-specific?  P0_PUSCH, P0_PUCCH, α, δpusch, ∆TF are CC-specific  There is a max power for the total UE transmit power (provided by RAN4)  There is a CC-specific max power  Pathloss derivation  The DL CC used for pathloss derivation for power control of each UL CC is configured by the network (any restrictions on correspondence between DL and UL CCs for this purpose are up to RAN4)  Whether a pathloss offset per CC needs to be signalled to the UE is FFS  The number of DL CCs measured is up to RAN4  TPC command transmission  TPC in UL grant is applied to UL CC for which the grant applies  TPC in DL grant is applied to UL CC on which the ACK/NACK is transmitted LTE-Advanced 주요 표준 동향 및 요소 기술
  • 63. Uplink Power Control  PHR  Per CC  FFS whether or not PHR is per channel (i.e. PUSCH / PUCCH) within each per-CC PHR  Max power scaling  Starting point:  PUCCH power is prioritised; remaining power may be used by PUSCH (i.e. PUSCH power is scaled down first, maybe to zero)  scaling is per channel  Detailed formula is FFS  Power control for multiple antennas: FFS LTE-Advanced 주요 표준 동향 및 요소 기술
  • 64. Relay  Overview  Type 1 Relay  Type 2 Relay  Resource Partioning for Relay-eNB link  Access-Backhaul Partitioning  Backward compatible backhaul partitioning  Backhaul Resource Assignment  R-Channel design
  • 65. Overview  Relaying  as a tool to improve e.g. the coverage of high data rates, group mobility, temporary network deployment, the cell-edge throughput and/or to provide coverage in new areas.  Relay functionalities  Wirelessly connected to radio-access network via a donor cell.  Connection type  Inband,  Outband  Duplexing  Half duplex relay  resource partioning required  Full duplex relay  Outband relay  Inband relay with enough spatial separtion or enhanced interference cancellation  no need to consider resource partioning  Relay classification w.r.t the knowledge in the UE  Transparent  Non-transparent  Depending on the relaying strategy, a relay may  Control cells of its own (similar to eNB : type 1 relay)  Be part of the donor cell (L2 relay, Type 2 relay)  Relay in Rel’10 LTE-Advanced  Inband half duplex relay and outband relay will be included in the initial version of LTE- Advanced LTE-Advanced 주요 표준 동향 및 요소 기술
  • 66. Type 1 Relay  Control Cells of its own  It control cells, each of which appears to a UE as a separate cell distinct from the donor cell  Has unique physical-layer cell identity (defined in Rel-8)  Shall transmit its own synchronization, reference symbols, ..  The same RRM mechanisms as normal eNB  No difference in accessing cells controlled by a relay and cells controlled by a “normal” eNB from a UE perspective  Shall appear as a Rel-8 eNB to Rel.8 UE  To LTE-A UEs, it should be possible for a type 1 relay node to appear differently than Rel.8 eNB to allow for further performance enhancement  UE shall receive scheduling information and HARQ feedback directly from the relay node and send its control channels (SR/CQI/ACK) to the relay node  Self-backhauling, in-band relay LTE-Advanced 주요 표준 동향 및 요소 기술
  • 67. Type 2 Relay  Part of the donor cell  It does not have a separate Physical Cell ID  Would not create any new cells  It is transparent to Rel-8 UEs;  A Rel-8 UE should not be aware of the presence of a type 2 relay node  At least part of the RRM is controlled by the eNB to which the donor cell belongs  It can transmit PDSCH  At least, it does not transmit CRS and PDCCH  L2 relay, smart repeaters, decode-and-forward relays LTE-Advanced 주요 표준 동향 및 요소 기술
  • 68. Resource Partioning for Relay-eNB Link  Link definition  Backhaul link  DL backhaul : eNB-> RN  UL backhaul : RN -> eNB  Access link  DL access : RN -> UE  UL access : UE -> RN LTE-Advanced 주요 표준 동향 및 요소 기술
  • 69. Resource Partioning for Relay-eNB Link  Inband Backhauling of Relay  eNB-to-relay link operates in the same frequency spectrum as the relay-to-UE link  In this case, half duplex relay operation is more feasible  Simultaneous eNB-to-relay and relay-to-UE transmissions on the same frequency resource may not be feasible  Due to relay transmitter causing interference to its own receiver  Unless sufficient isolation of the outgoing and incoming signals is provided  Similarly, relay may not be possible to receive UE transmissions simultaneously with the relay transmitting to the eNB  Therefore, resource partioning scheme should be taken into account in case of inband half duplex relay LTE-Advanced 주요 표준 동향 및 요소 기술
  • 70. Resource Partioning for Relay-eNB Link  Relay functionalities  In-band backhauling of the relay traffic  General principle for resource partitioning at the relay:  eNB → RN and RN → UE links are time division multiplexed in a single frequency band (only one is active at any time)  RN → eNB and UE → RN links are time division multiplexed in a single frequency band (only one is active at any time)  Multiplexing of backhaul links in FDD:  eNB → RN transmissions are done in the DL frequency band  RN → eNB transmissions are done in the UL frequency band  Multiplexing of backhaul links in TDD:  eNB → RN transmissions are done in the DL subframes of the eNB and RN  RN → eNB transmissions are done in the UL subframes of the eNB and RN LTE-Advanced 주요 표준 동향 및 요소 기술
  • 71. Access-Backhaul Partitioning  Example of UL resource TDM partitioning eNB UL RX UL RX subframe Relay UL TX UL TX No TX Relay UL RX No RX UL RX R-UE UL TX e.g. blocked subframe UL TX LTE-Advanced 주요 표준 동향 및 요소 기술
  • 72. Access-Backhaul Partitioning  Illustration F2 F1 UE1 UL (F2) DL (F1) eNB F1: DL frequency (FDD) F2: UL frequency (FDD) UL (F2) DL (F1) RN One link active at a time One link active at a time UL (F2) DL (F1) UE2 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 73. Backward Compatible Backhaul Partitioning  Backward compatibility of Relay node  In certain subframes, a relay node receives DL transmissions  In certain other subframes, a relay node transmits on DL  In the subframes where a relay node receives DL transmissions, Rel. 8 UE does not expect any relay transmission in PDSCH by configuring MBSFN subframe  Relay backhauling subframe  Create transmission gap in the relay-to-UE transmission  Relay is not transmitting any signal to UE when it is supposed to receive data from the donor eNB  Configuring MBSFN subframes  During “gaps”, UEs(including Rel-8 UEs) are not supposed to expect any relay transmission  Relay-to-eNB transmissions can be facilitated by not allowing any terminal-to-relay transmission in some subframes  Relay should transmit PDCCH and CRSs in PDCCH region eNB-to-relay transmission One subframe transmission gap Ctrl Data Ctrl (“MBSFN subframe”) No relay-to-UE transmission LTE-Advanced 주요 표준 동향 및 요소 기술
  • 74. Backhaul Resource Assignment  Backhaul Subframe allocation  At the RN, the access link DL subframe boundary is aligned with the backhaul link DL subframe boundary, except for possible adjustment to allow for RN transmit/receive switching  The set of DL backhaul subframes  During which DL backhaul transmission may occur  Semi-statically assigned  The set of UL backhaul subframes  During which UL backhaul transmission may occur,  Can be semi-statically assigned,  Or implicitly derived from the DL backhaul subframes using the HARQ timing relationship  R-PDCCH (Relay Physical Downlink Control CHannel)  R-PDCCH is used to assign resources for the DL backhaul data  Dynamically or semi-persistently assign resources  May assign DL resources in the same and/or in one or more later subframes.  R-PDCCH is used to assign resources for the UL backhaul data  Dynamically or semi-persistently assign resources  May assign UL resources in one or more later subframes. LTE-Advanced 주요 표준 동향 및 요소 기술
  • 75. R-Channel Design (TR 36.814)  R-PDCCH resources  PRBs for R-PDCCH transmission is semi-statically assigned  Resources for R-PDCCH transmission within semi-statically assigned may vary dynamically between subframes  Resources that are not used for R-PDCCH within the semi-statically assigned PRBs may be used to carry R-PDSCH or PDSCH  R-PDCCH decoding  R-PDCCH transmitter processing (channel coding, interleaving, multiplexing, etc.) should reuse Rel-8 functionality to the extent possible  Search space approach of R8 is used for the backhaul link  Use of common search space, which can be semi-statically configured (and potentially includes entire system bandwidth  If RN-specific search space is configured, it could be implicitly or explicitly known by RN.  The R-PDCCH is transmitted starting from an OFDM symbol within the subframe that is late enough so that the relay can receive it.  “R-PDSCH” and “R-PDCCH” can be transmitted within the same PRBs or within separated PRBs. LTE-Advanced 주요 표준 동향 및 요소 기술
  • 76. R-Channel Design  Backhaul link reference signal  For R-PDCCH,  For a given RN, R-PDCCH demodulation RS type (CRS or DM-RS) shall not change dynamically nor depend on subframe type.  Demodulate with  In normal subframes:  Rel-10 DM-RS when DM-RS are configured by eNB  Otherwise Rel-8 CRS  In MBSFN subframes, Rel-10 DM-RS  Baseline may be modified (in relation to which OFDM symbols contain DM RS) depending on RAN4 response on the timing.  For downlink shared data transmission on Un  Same possibilities as for R-PDCCH  Further discussion point  R-PDCCH multiplexing  Backhaul link HARQ timing  Detailed R-PDCCH design LTE-Advanced 주요 표준 동향 및 요소 기술
  • 77. Backhaul Link Timing: DL [1]  Backhaul downlink timing  The RN can receive Un DL transmissions starting with OFDM symbol numbered m and it can stop receiving with the OFDM symbol numbered n.  Here OFDM symbol numbering within the subframe starts at 0  k is equal to the number of OFDM symbols used for the L1/L2 control region at the RN access  The following cases are deemed for further consideration:  Case 1: RN can receive the DL backhaul subframe starting from OFDM symbol m=k+1 until the end of the subframe (n=13 in case of normal CP)  This corresponds to the case when RN switching time is longer (> cyclic prefix) and RN DL access transmit time is slightly offset with respect to DL backhaul reception time at the RN  Case 2: RN can receive the DL backhaul subframe starting from OFDM symbol m=k until the end of the subframe (n=13 in case of normal CP)  This corresponds to the case when RN switching time is sufficiently shorter than the cyclic prefix and RN DL access transmit time is aligned to the DL backhaul reception time at the RN  Case 3: RN can receive the DL backhaul subframe starting from OFDM symbol m ≥k until OFDM symbol n<13 (depending on the propagation delay and the switching time)  This corresponds to the case when RN DL Uu transmissions is synchronized with the eNB DL transmissions  Case 4: RN can receive the DL backhaul subframe starting from OFDM symbol 0 until OFDM symbol n=13-(k+1)  This corresponds to the case when RN can receive the normal PDCCH. LTE-Advanced 주요 표준 동향 및 요소 기술
  • 78. Backhaul Link Timing: DL [2]  Case 1: DL (-) timing offset A fixed delay in addition to propagation delay LTE-Advanced 주요 표준 동향 및 요소 기술
  • 79. Backhaul Link Timing: DL [3]  Case 2 (DL): No offset, Switching time < CP LTE-Advanced 주요 표준 동향 및 요소 기술
  • 80. Backhaul Link Timing: DL [4]  Case 3 (DL): Global Tx timing sync  Cas3 3a: [(Tp<L)&(Tp<G1)&(Tp+G2<L), symbol_length = L] LTE-Advanced 주요 표준 동향 및 요소 기술
  • 81. Backhaul Link Timing: DL [5]  Case 3 (DL): Global Tx timing sync  Case 3b: [(G1<Tp<L)&(Tp+G2<L), symbol_length = L] LTE-Advanced 주요 표준 동향 및 요소 기술
  • 82. Backhaul Link Timing: UL [1]  Backhaul link UL timing  RNshould transmit SC-FDMA symbols m=0 until the end of the UL backhaul subframe (n=13 in case of normal CP)  This corresponds to the case when the access link and backhaul link UL subframe boundary is staggered by a fixed gap and RN switching time is considered by configuring the UE not to transmit the last SC- FDMA symbol of the Uu link  Further discussion point  There are concerns about the impact of Case 2b on the usage of SRS and/or CQI on the access link  Companies are encouraged to analyze the impact and evaluate the pe rformance, especially for TDD, for the next meeting  If impact is not acceptable, consider other RN UL timing cases LTE-Advanced 주요 표준 동향 및 요소 기술
  • 83. Backhaul Link Timing: UL [2]  UL timing: (-) time offset  Not listening to the symbol#13 (or SRS) in Uu link LTE-Advanced 주요 표준 동향 및 요소 기술
  • 84. Enhanced DL MIMO Transmission  DL RS: Overview  DL-RS: DM-RS  DL-RS: CSI-RS  DL MIMO: Overview  DL-MIMO: DL-MIMO in LTE-Advanced
  • 85. DL-RS: Overview [1]  RS types in LTE-Advanced  Two types of new RS are introduced in LTE-Advanced in addition to CRS (Common Reference Signal) defined in Rel-8  DMRS (Demodulation RS)  CSI-RS (Channel State Information RS)  UE-specific DM-RS, which is precoded, makes it possible to apply non- codebook-based precoding  UE-specific DM-RS will enable application of enhanced multi-user beamforming such as zero forcing (ZF) for, e.g., 4-by-2 MIMO LTE-Advanced 주요 표준 동향 및 요소 기술
  • 86. DL-RS: Overview [2]  DM-RS based system in LTE-Advanced  Support of Rel-8 Common RS  LTE-Advanced eNB should always support LTE UE as well  Rel-8 CRS is also used for LTE-Advanced UEs to detect PCFICH, PHICH, PDCCH, PBCH and PDSCH (TxD only)  RS overhead optimization  main motivation for DM-RS based approach  Employing DM-RS for demodulation of PDSCH only (except TxD)  Transmitted only in an RB allocated for a UE in every subframe  12RE up to rank-2  24RE up to rank-8  Employing CSI-RS for measurment  Transmitted by pucturing PDSCH RE in a duty cycle  Idea is that CSI-RS overhead can be made very small (e.g. less than 1% for 8Tx antenna support)  Define LTE-Advanced only subframe by MBSFN type signalling  LTE-Advanced PDSCH only in these subframe  Rel-8 CRS is not transmitted in PDSCH region  Independent antenna configuration  Although LTE-Advanced antenna port is larger than 4Tx, Rel-8 antenna port can be defined less than 4Tx LTE-Advanced 주요 표준 동향 및 요소 기술
  • 87. DL-RS: Overview [3]  Allow transmissions of PDSCH to Rel-10 UEs in MBSFN (LTE- advanced) subframes  Possible to configure CSI RS for transmission in LTE-Advanced subframes  Possible to use LTE-Advanced features without any LTE- advanced subframes  Cell specific CSI-RS possible to transmit in normal Rel-8 subframes  Consideration on CSI-RS impact on PDSCH transmissions to Rel-8 UEs for various RS densities needed  There should be no impact from CSI RS transmission on transmission of PBCH/PSS/SSS  Strive for same CSI RS and DM-RS patterns regardless of subframe type (DL Rel-8 or DL LTE-A subframes)  DM-RS in support of up-to 8 transmission layers should be defined LTE-Advanced 주요 표준 동향 및 요소 기술
  • 88. DL-RS: DM-RS [1]  Characteristics  UE specific  Transmitted only in scheduled RBs and the corresponding layers:  Design principle is an extension of the concept of Rel-8 UE- specific RS (used for beamforming) to multiple layers  RSs on different layers are mutually orthogonal  RS and data are subject to the same precoding operation  No need to transmit precoding information  Per-PRB based channel estimation  Precoding granularity indication is FFS  Complementary use of Rel-8 CRS by the UE is not precluded LTE-Advanced 주요 표준 동향 및 요소 기술
  • 89. DL-RS: DM-RS [2]  DM-RS pattern for rank-1 and rank-2  Forward compatible DM-RS pattern design from LTE Rel-9 dual layer beamforming  CDM between two layers  DM-RS pattern agreed for Rel-9 dual layer beamforming Normal subframe DwPTS (symbols >= 11) DwPTS (symbols<11)  Extended CP was not agreed and thus is not supported in conjunction with transmission mode 8 in Rel-9.  Note that this does not preclude a solution being introduced in a later release LTE-Advanced 주요 표준 동향 및 요소 기술
  • 90. DL-RS: DM-RS [3]  DM-RS pattern for rank-3 and rank-4  Baseline is alternative 1 in the figure below  CDM+FDM, OCC length=2  24RE in an RB DwPTS with 11,12 DwPTS with 9,10 OFDM symbols OFDM symbols LTE-Advanced 주요 표준 동향 및 요소 기술
  • 91. DL-RS: DM-RS [4]  DM-RS pattern for rank5~8  Hybrid CDM+FDM DMRS patterns are adopted for rank 5-8 transmission with normal CP (normal subframe, DwPTS)  Same location with same density (24RE per PRB) as the rank3-4  The length of OCC in time domain is 4 for both CDM groups  2 CDM group, OCC length=4 Normal subframe DwPTS with 11,12 DwPTS with 9,10 OFDM symbols OFDM symbols  Multiple RB optimization  Followings are FFS  DM-RS pattern optimization according to the number of RBs allocated  Precoding granularity indication LTE-Advanced 주요 표준 동향 및 요소 기술
  • 92. DL-RS: CSI-RS [1]  Baseline assumption for CSI-RS  CSI-RS is transmitted by puncturing data RE on both LTE Rel-8/9 and LTE-Advanced PDSCH  Some performance impacts on the legacy Ues are inevitable  Loss of information due to puncturing  Interference from CSI-RS  Uniform frequency spacing and periodic time domain transmission  Agreed to transmit all the CSI-RS for every antenna port within the same subframe  Overhead assumption  CSI-RS density in frequency domain  1 RE per PRB for 2, 4 and 8 antenna port  CSI-RS density in time domain  Multiple of 5 msec is baseline for further evaluations.  10ms periodicity is prioritized  Assuming 10ms periodicity, CSI-RS overhead can be calculated as 0.06% (1/1680) (8 antenna port = 0.48 %)  Time density: 1 symbol every 10ms per antenna port  1/140  Frequency density: 1 RE per PRB  1/12 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 93. DL-RS: CSI-RS [2]  Relationship between CSI-RS and Rel-8 CRS  No mixed use of Rel-8 CRS and Rel-10 CSI RS for a configured Rel-10 CSI measurement of a given cell at Rel-10 UE (for all possible number of antenna ports in the cell)  For the configured CSI measurement the UE measures either on Rel-8 CRS or on Rel-10 CSI RS for the given cell  8 Rel-10 CSI RS can be configured for Rel-10 CSI measurements in a given cell  For this case of Rel-10 CSI measurements, only the 8 Rel-10 CSI RS are used for the CSI measurements corresponding to the given cell  CSI RS are punctured into the data region of normal/MBSFN subframes  However, independent antennea configuration is possible LTE-Advanced 주요 표준 동향 및 요소 기술
  • 94. DL-RS: CSI-RS [3]  Further agreement in RAN1 with respect to CSI-RS  Full-power utilization is the design target.  Send an LS to RAN4 asking about the feasibility of 9 dB boosting.  Same data RE power between a data RE in the OFDM symbol containing CSI-RS and a data RE in the OFDM symbol without CSI-RS/Rel-8 CRS is assumed within a subframe  Resource elements (REs) of CSI-RS are configured and/or tied to system parameters for inter-cell orthogonality, i.e, no collision between CSI-RS  Partial collision of CSI-RS for inter-cell randomization is not precluded.  CSI-RS pattern for {2,4,8} CSI-RS ports  Port 0 is fully configured (subframe, OFDM symbol, frequency location) by L3 signaling and /or tied to system parameters  The other ports follow port0 (implicit)  FFS if all ports have the same shift or different shift in time and frequency  For intra-cell CSI-RS, FDM/TDM/CDM/CSM needs further study.  Study RE muting, i.e., no collision between CSI-RS and data, for multi-cell CSI measurement  Consider the impact of muting on UE interference measurement  Consider the impact on Rel-8 UE  Power reallocation of muted REs is FFS LTE-Advanced 주요 표준 동향 및 요소 기술
  • 95. DL-MIMO: Overview  Gains from MIMO LTE-Advanced 주요 표준 동향 및 요소 기술
  • 96. DL-MIMO: Overview LTE-Advanced 주요 표준 동향 및 요소 기술
  • 97. DL-MIMO in LTE-Advanced  The number of transmit antennas in DL: up to 8  Design issue  Number of codewords  Reference signal (RS)  Transmit diversity  Precoding  Multi-user MIMO (MU-MIMO)  Maximum number of codewords: 2  2 transport blocks in a subframe  Number of MCS fields: 2  Separate link adapation of two codewords LTE-Advanced 주요 표준 동향 및 요소 기술
  • 98. DL-MIMO in LTE-Advanced  CW-to-Layer mapping in support of 8-Tx antenna  Up to 4 layers, same mapping rule as in Rel-8  For higher number layers, it was agreed to simply extend the Rel-8 mapping so that two codewords are as much evenly distributed over each layer as possible LTE-Advanced 주요 표준 동향 및 요소 기술
  • 99. DL MIMO in LTE-Advanced  Transmit Diversity Scheme  Rel-8TxD will be reused with CRS in normal subframe  TBD: TxD definition in LTE-Advanced only subframe  Alt 1: rank-2 DRS supports SFBC  Alt 2: channel interpolation with the CRS in the next subrame PDCCH region  Alt 3: no definition of TxD in LTE-Advanced only subframe LTE-Advanced 주요 표준 동향 및 요소 기술
  • 100. DL MIMO in LTE-Advanced  MU-MIMO  In Rel-9, DM-RS based MU-MIMO scheme was decided  Dynamic indication of DM-RS port is supported in case of rank 1 transmission  To enable scheduling of two UEs with rank-1 transmission using different orthogonal DMRS ports on the same PDSCH resources  SU/MU assumption  no explicit signaling of the presence of co-scheduled UE in case of rank 1 transmissions  in case of rank-1 transmission, the UE cannot assume that the other DM RS antenna port is not associated with PDSCH assigned to another UE  Dynamic SU/MU switching in LTE-Advanced  Switching between SU- and MU-MIMO transmission is possible without RRC reconfiguration  Transparent vs. Non-transparent MU-MIMO  “Transparent” here means that no downlink signalling is provided to indicate to a UE whether a downlink transmission to another UE is taking place in the same RB.  No clear preference for transparent or non-transparent MU-MIMO at this stage.  If MU-MIMO were to be non-transparent, strongest possibilities to consider for downlink signalling include:  whether / which DM-RS ports are used for other UEs  Power offset LTE-Advanced 주요 표준 동향 및 요소 기술
  • 101. DL-MIMO in LTE-Advanced  Target design criteria for 8Tx Codebook  8Tx codebook is now under discussion for feedback purpose only  Design criteria  For rank > 2, optimize for SU-MIMO only  For rank <= 2, optimize for both SU- and MU-MIMO  For MUMIMO, target UE separation in correlation domain  Suitable for various antenna configurations  Feedback of precoding codebook  Implicit feedback (PMI/RI/CQI) is used also for Rel-10  UE spatial feedback for a subband represents a precoder (as constructed below)  CQI computed based on the assumption that eNodeB uses a specific precoder (or precoders), as given by the feedback, on each subband within the CQI reference resource  Note that a subband can correspond to the whole system bandwidth  A precoder for a subband is composed of two matrices  The precoder structure is applied to all Tx antenna array configurations  Each of the two matrices belong to a separate codebook  The codebooks are for further study  The codebooks are known (or synchronized) at both the eNodeB and UE  Codebooks may or may not change/vary over time and/or different subbands  That is, two codebook indices together determine the precoder  One of the two matrices targets wideband and/or long-term channel properties  The other matrix targets frequency-selective and/or short-term channel properties  Note that a matrix codebook in this context should be interpreted as a finite enumerated set of matrices that for each RB is known to both UE and eNodeB.  Note that Rel-8 precoder feedback can be deemed as a special case of this structure LTE-Advanced 주요 표준 동향 및 요소 기술
  • 102. UL MIMO  UL MIMO: Overview  UL MIMO: Multiple Access Scheme  UL MIMO: Receiver for UL MIMO  UL MIMO: Multi-Antenna Support  UL MIMO: Reference Signal
  • 103. UL-MIMO: Overview [1]  UL-MIMO in Rel’8  UL MIMO was not supported for complexity reason  64QAM was introduced instead during Rel’8 time frame  Only antenna switching Tx diversity is defined in Rel-8 LTE  MU-MIMO was supported in an implicit manner (specification transparent way)  LTE-Advanced  Agreed to employ SU-MIMO in LTE-Advanced  Crucial in satisfying 3GPP’s own peak spectrum efficiency requirement  The number of transmit antennas in UL  Up to 4 transmit antenna will be supported  4 layer transmission  Design issue  Multiple access scheme  Number of codewords  Precoder design  Transmit diversity LTE-Advanced 주요 표준 동향 및 요소 기술
  • 104. UL-MIMO: Overview [2]  Necessity of Preserving CM  OFDM vs. SC-FDMA discussion in early LTE-Advanced SI phase  SC-FDMA is agreed as an uplink multiplexing scheme  MIMO transmission should be implemented with SC-FDMA  SC-FDMA based MIMO transmission  CM can be one of design criteria for uplink MIMO scheme  Single antenna mode support  In this mode, the UE behavior is same as the UE behaviour with single antenna from eNB’s perspective  Exact UE implementation is left to UE vendors (e.g., PA archiecture)  PUCCH and/or PUSCH and/or SRS transmission can be independently configured for single uplink antenna port transmission  Detail scenario and operation is FFS  UL single antenna port mode is the default operation mode before eNB is aware of the UE transmit antenna configuration LTE-Advanced 주요 표준 동향 및 요소 기술
  • 105. UL-MIMO: Multiple Access Scheme  SC-FDMA vs. OFDMA  Complexity  SC-FDMA: turbo SIC  OFDMA: maximum likelihood detector (MLD)  MLD is more complex in 16/64 QAM, especially for 4x4 configuration  Latency  Depends on computational complexity  SC-FDMA and OFDMA may not give significant difference  Performance  OFDMA shows gain over SC-FDMA in high SNR range for 2x2 configuration  Similar performance for 2x4 configuration  OFDMA shows system level gain over SC-FDMA in 2x2 and 4x4 configuration  SC-FDMA was adopted for multiple access scheme as UL MIMO transmission LTE-Advanced 주요 표준 동향 및 요소 기술
  • 106. UL-MIMO: Receiver for UL MIMO  Soft interference canceller (SIC): turbo SIC  Implementationflexibility: various algorithms  One implementation [1]: R1-083732 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 107. UL-MIMO: Multi-Antenna Support [1]  Number of codewords: 2 2 transport blocks in a subframe  Same codeword-to-layer mapping as in LTE downlink codeword to layer mapping for 2 Tx and 4 Tx LTE-Advanced 주요 표준 동향 및 요소 기술
  • 108. UL-MIMO: Multi-Antenna Support [2]  Candidates forTx diversity for PRACH  PVS, CDD, TSTD  Candidates for Tx Diversity for PUSCH  No consensus on the necessity of TxD in Rel-10  Identify target use cases where 2 TxD bring additional benefit, compared to single antenna mode and SM mode  Following candidates are on the table  2 transmit antennas  FSTD  STBC: special care of unpaired symbol due to SRS  Modified SFBC  Closed loop rank 1 precoding  4 transmit antennas  STBC + FSTD  STBC + PSD  CDD + FSTD  Modified SFBC + FSTD  Closed loop rank 1 precoding LTE-Advanced 주요 표준 동향 및 요소 기술
  • 109. UL-MIMO: Multi-Antenna Support [3]  PUCCH TxD  2 Tx PUCCH transmit diveristy scheme  Rel-8 PUCCH format 1/1a/1b: Spatial Orthogonal Tramsit Diveristy (SORTD) is applied  The same modulation symbol d(0) is transmitted on different orthogonal resources for different antennas  Exact resource allocation: FFS  PUCCH format 2 TxD  Three major camps for PUCCH format 2 :  No TxD, SORTD, STBC without slot hopping  4 Tx PUCCH transmit diversity: 2Tx TxD is applied (UE implementation issue) n_r=(n_cs, n_oc, n_PRB) for PUCCH format 1 n_r=(n_cs, n_PRB) for PUCCH format 2 Ant#0 d_0 (n) Spreading with n_r0 . d_0 (n) Modulation symbol . . Ant#M-1 d_0 (n) Spreading with n_rM-1 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 110. UL-MIMO: Multi-Antenna Support [4]  SU-MIMO  Codebook based precoding  Independent codebook design for different ranks  Single wideband TPMI per UL component carrier  Frequency non-selective precoding in a component carrier  Codebook size  2 Tx: 1-layer+2-layer ≤ 8 (3-bit codebook)  4 Tx: 1-layer+2-layer+3-layer+4-layer ≤ 64 (6-bit codebook  Dynamic rank adaptation  Alphabet size: QPSK alphabet: {1, -1, j, -j}  Further consideration point  UL frequency selective precoding  Impact on antenna gain imbalance (AGI) due to hand-gripping problem  Antenna power amp (PA) configuration  2 Tx antenna  20dBm + 20dBm  23dBm + 23dBm  23dBm + x, where x ≤ 23dBm  4 Tx antenna  17dBm + 17dBm + 17dBm + 17dBm  23dBm + 23dBm + 23dBm + 23dBm and  23dBm + x + x + x where x ≤ 23dBm LTE-Advanced 주요 표준 동향 및 요소 기술
  • 111. UL-MIMO: Multi-Antenna Support [5]  Precoder design for 2 Tx LTE-Advanced 주요 표준 동향 및 요소 기술
  • 112. UL-MIMO: Multi-Antenna Support [6]  Precoder design for 4Tx  Separate design of each rank  No nested property  Alphabet in codebook element: from {1, -1, j, -j}  Antenna selection codebook elements in rank 1  Cubic metric preserving (CMP) codebook in rank 2 and rank 3  Identity precoding matrix in rank 4 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 113. UL-MIMO: Multi-Antenna Support [7]  4Tx rank-1 codebook  Size-24: 16 constant modulus + 8 antenna pair turn-off vectors LTE-Advanced 주요 표준 동향 및 요소 기술
  • 114. UL-MIMO: Multi-Antenna Support [8]  4Tx rank-2 codebook  Size-16: CM-preserving matrices  QPSK alphabet LTE-Advanced 주요 표준 동향 및 요소 기술
  • 115. UL-MIMO: Multi-Antenna Support [9]  4Tx rank-3 codebook  Size-12 CMP codebook  BPSK alphabet 1 0 0 1 0 0 1 0 0 1 0 0   0  1 1 0 0  1 − 1 0 0 1 0 1 0  10 1  Index 0 to 3   2 0 1 0 2 0 1 0 2 1 0 0 2 − 1 0 0         0 0 1 0 0 1 0 0 1 0 0 1 1 0 0 1 0 0 0 1 0 0 1 0  0   0 10 1  1 1 0 0   11 0 0 Index 4 to 7 1 0 1   2 0 0 1 2 0 0 1 2 1 0 0 2 − 1 0 0         1 0 0 − 1 0 0 0 0 1 0 0 1 0 1 0 0 1 0 0 1 0 0 1 0   1  1  1 1 0 0 11 0 0  1 0 0  10 0  Index 8 to 11  2 0 0 1 2 0 0 1 2 1 0 0 21 0 0         1 0 0 − 1 0 0 1 0 0 − 1 0 0  4Tx rank-4 codebook  Single identity matrix LTE-Advanced 주요 표준 동향 및 요소 기술
  • 116. UL-MIMO: Multi-Antenna Support [10]  Number of MCS fields: 2  Separate link adapation of two codewords  Discussion on layer shifting  Among the followings, alternative 2 was agreed  Alt1: No HARQ-ACK Spatial Bundling and no layer shifting.  Alt2: No layer shifting, and continue discussion on HARQ bundling.  Alt 3: Layer shifting with HARQ bundling LTE-Advanced 주요 표준 동향 및 요소 기술
  • 117. UL-MIMO: Reference Signal [1]  UL DM-RS in support of UL-MIMO  Precoded UL DM-RS  2Tx  rank 1-rank 2: precoded RS  4Tx  rank 1-rank2, rank 4: precoded RS  rank 3 : FFS, but potential agreement of precoded DM-RS in case of rank-3  Same precoding for DM RS and PUSCH  UL DM-RS multiplexing  Cyclic shift (CS) separation for DM-RS multiplexing  TBD: Orthogonal cover code (OCC) separation between slots for interference suppression  DM-RS sequence design for non-contiguous resource allocations  Working assumption: Base sequence according to the whole allocation size and split into clusters. LTE-Advanced 주요 표준 동향 및 요소 기술
  • 118. UL-MIMO: Reference Signal [2]  UL sounding reference signal  Re-use of Rel-8 principles (CS separation, IFDM separation) with some possible modifications  SRS configuration per CC in case of carrier aggregation  Dynamic aperiodic SRS is supported  Continue discussion on PDCCH signaling aspects,  how to provide aperiodic SRS resources (including for multiple antennas), how to share these resources with ones for periodic SRS, and for the duration of the dynamic SRS transmission (e.g. one-shot, with a timer, semi-persistent until disabled, etc.)  Precoded SRS is not supported in Rel-10  Further discussion point  need for sounding via DMRS  need for increased SRS multiplexing possibilities (if so, which methods)  need for multi-cell coordination / randomisation (which methods if any)  need for SRS coverage enhancement  need for non-contiguous SRS transmission LTE-Advanced 주요 표준 동향 및 요소 기술
  • 119. CoMP  Overview  Carrier Types  MAC-PHY interface  Uplink Multiple Access  Uplink Control Channel  Downlink Control Channel  UL Power control
  • 120. Terminology and Definition – CoMP Set  CoMP Cooperating Set  Set of (geographically separated) points directly or indirectly participating in PDSCH transmission to UE.  COMP transmission point(s)  Point or set of points actively transmitting PDSCH to UE  CoMP transmission point(s) is a subset of the CoMP cooperating set  For Joint transmission, the points in the CoMP cooperating set  For Dynamic cell selection, a single point is the transmission point at every subframe. This transmission point can change dynamically within the CoMP cooperating set.  For Coordinated scheduling/beamforming, the “serving cell”  Transparent/non-transparent to UE  CoMP measurement set  Set of cells about which channel state/statistical information related to their link to the UE is reported  May be the same as the CoMP cooperating set  The actual UE reports may down-select cells for which actual feedback information is transmitted (reported cells) LTE-Advanced 주요 표준 동향 및 요소 기술
  • 121. CoMP Category  Joint Processing  Data is available at each point in CoMP cooperating set  Joint Transmission  Dynamic Cell Selection  Coordinated Scheduling/Beamforming (CS/CB)  Data is only available at serving cell  Joint Transmission  Data to a single UE is available at multiple transmission points  PDSCH transmission from multiple points (part of or entire CoMP cooperating set) at a time  Coherently or non-coherently  To improve the received signal quality and/or cancel actively interference for other UEs  Dynamic Cell Selection  CoMP transmission point from a single point  Can change dynamically within the CoMP cooperating set.  Cooperative Scheduling/ Beamforming (CS/CB)  Data is only available at serving cell  User scheduling/beamforming decisions are made with coordination among the CoMP cooperating set.  CoMP transmission point : serving cell LTE-Advanced 주요 표준 동향 및 요소 기술
  • 122. CoMP Operation- Joint Transmission LTE-Advanced 주요 표준 동향 및 요소 기술
  • 123. CoMP Operation– CS/CB 참고) R1-092232, “Summary of email discussion for CoMP” Qualcomm LTE-Advanced 주요 표준 동향 및 요소 기술
  • 124. Joint Processing: Transparent vs. Non-transparent  Transparent to UE  DL joint transmission is based on the dedicated reference signals (DRS) for demodulation  UEs need not know which eNBs participate in transmission  Easy to implement and minimal spec change  May cause performance degradation due to CRS and PDSCH collision  RE collision may be resolved by alignment among CoMP transmission points  Non-transparent to UE  CRS and PDSCH RE mapping collision among transmission points  Enable resource mapping optimization  Increase overhead for DL control channels  Transmission Points : semi-statically (or dynamically) configured LTE-Advanced 주요 표준 동향 및 요소 기술
  • 125. Joint processing: Coherent vs. Non-coherent  In terms of manner of the combination of signal from multiple cells at UE  Coherent transmission  Non-coherent transmission  Coherent transmission  UE could combine transmitted signal coherently  Network obtains channel state information of all the cooperating cell sites  Phase correction + precoding  Phase factor obtained from feedback or calculated at network side  The transmitted signal from each cell is multiplied by a distinct phase factor  Global precoding  Non-coherent transmission  Signal arriving at UE is unable to combine coherently LTE-Advanced 주요 표준 동향 및 요소 기술
  • 126. Precoding Codebook for CoMP  Global precoding (joint design)  A single super-cell codebook is designed considering multiple points.  A codebook needs to be designed for each combinations  Number of cooperating points  Number of transmit antennas  Number of layers  The performance is upper bound of all precoding schemes for CoMP  High Complexity  Large global codebook to quantize  Codebook varies with the size of CoMP cells  Local precoding (disjoint design)  A single super-cell codebook is composed by the N(number of cooperating points) single-cell codebook  Local precoding design is simpler  The performance is worse than that of global precoding LTE-Advanced 주요 표준 동향 및 요소 기술
  • 127. Cell Clustering for CoMP  UE-specific Clustering  Cluster of coordinated cells chosen based on the preference of the UE  Largest throughput gain  Scheduling among all eNBs in the system needed  Excessive Backhaul overhead  Fixed Clustering  Simple in terms of implementation  Throughput gain obtained is limited  Hybrid UE-specific clustering – UE specific with Network assistance  Cluster of eNB serving a particular UE is a subset of a larger fixed cluster  Throughput gain  Reduce scheduling complexity and backhaul demand  Semi-statically (or dynamically) configured LTE-Advanced 주요 표준 동향 및 요소 기술
  • 128. Feedback in Support of DL CoMP  CoMP Feedback mechanisms  Explicit channel state/statistical information feedback  Channel as observed by the receiver, without assuming any transmission or receiver processing  Implicit channel state/statistical information feedback  Use hypotheses of different transmission and/or reception processing, e.g., CQI/PMI/RI  Channel reciprocity  UE transmission of SRS can be used for CSI estimation at eNB  UE CoMP feedback reports target the serving cell  on UL resources from serving cell LTE-Advanced 주요 표준 동향 및 요소 기술
  • 129. Explicit Feedback  Channel part  For each cell in the UE’s measurement set that is reported in a given subframe, one or several channel properties are reported  Channel properties include (but are not limited to) the following  Channel matrix – short term (instantaneous)  Transmit channel covariance  Inter-cell channel properties may also be reported  Noise-and interference part  Interference outside the  Cells reported by the UE  CoMP transmission points  Total receive power (Io) or total received signal covariance matrix  Covariance matrix of the noise-and-interference LTE-Advanced 주요 표준 동향 및 요소 기술
  • 130. Implicit Feedback  Hypotheses at the UE and the feedback  based on one or a combination of two or more of the following, e.g.:  Single user vs. Multi user MIMO  Single cell vs. Coordinated transmission  Within coordinated transmission : Single point (CB/CS) vs. multi-point (JP) transmission  Within Joint processing CoMP  Subsets of transmission points or subsets of reported cells (Joint Transmission)  CoMP transmission point(s) (Dynamic Cell Selection)  Transmit precoder (i.e. tx weights)  JP : multiple single-cell or multi-cell PMI capturing  CB/CS : single-cell or multiple single-cell PMIs  Other types of feedbacks, e.g. main Multi-cell eigen-component, instead of PMIs are being considered  Receive processing (i.e. rx weights)  Interference based on particular tx/rx processing LTE-Advanced 주요 표준 동향 및 요소 기술
  • 131. Reference [1] [1] ITU-R, Revision 1 to Document IMT-ADV/2-E, “Submission and evaluation process and consensus building” [2] 3GPP, RP-08099, “Proposed schedule for the submission of LTE- Advanced to ITU-R as a candidate for IMT-Advanced”, AT&T et. Al [3] ITU-R, Addendum 2 to circular letter 5/LCCE/2 [4] ITU-R, Report ITU-R M.2133 “Requirements, evaluation criteria, and submission templates for the development of IMT-Advanced” [5] ITU-R, Report ITU-R M.2134 “Requirements related to technical system performance for IMT-Advanced Radio interface(s)” [6] ITU-R, Report ITU-R M.2135 “Guidelines for evaluation of radio interface technologies for IMT-Advanced” [7] 3GPP, RP-091000, Release 10 time plan [8] ITU-R WP5D/291, Initial 3GPP submission of a candidate IMT- Advanced technology [9] ITU-R WP5D/496, AN INITIAL TECHNOLOGY SUBMISSION OF 3GPP LTE RELEASE 10 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 132. Reference [2] [10] 3GPP, RP-090743, TR TR36.912 v9.0.0, Feasibility study for Further Advancements for E-UTRA, September 2009 [11] 3GPP, RP-090745, Annex C1: Characteristics template [12] 3GPP, RP-090746, Annex C2: Link budget template [13] 3GPP, RP-090747, Annex C3: Compliance template [14] 3GPP, RP-090744, Annex A3: Self-evaluation results [15] ITU-R, WP5D/564-E, COMPLETE SUBMISSION OF 3GPP LTE RELEASE 10 & BEYOND (LTE-ADVANCED) UNDER STEP 3 OF THE IMT-ADVANCED PROCESS [16] 3GPP, TR 36.913, “Requirements for further advancements for E- UTRA (LTE-Advanced)”, V8.0.0, June 2008 [17] 3GPP, RP-091005, Proposal for Candidate Radio Interface Technologies for IMT-Advanced Based on LTE Release 10 and Beyond [18] 3GPP, RP-100357, TR36.814, “Further Advancements for E-UTRA Physical Layer Aspects (Release 9)”, V2.0.1, March 2010 LTE-Advanced 주요 표준 동향 및 요소 기술
  • 133. Thanks !! LTE-Advanced 주요 표준 동향 및 요소 기술

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