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Further Enhancements for LTE-Advanced



Further Enhancements for LTE-Advanced

Further Enhancements for LTE-Advanced

Presented by Tetsushi Abe, NTT DOCOMO, INC., Vice Chairman of 3GPP RAN1

Sep. 2010



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Further Enhancements for LTE-Advanced Further Enhancements for LTE-Advanced Presentation Transcript

  • Further Enhancements for LTE-Advanced Tetsushi Abe NTT DOCOMO, INC. Vice Chairman of 3GPP RAN1NTT DOCOMO, INC., Copyright 2010, All rights reserved. 1
  • Outline • Introduction • LTE Rel-10 – Requirements – Technical features • LTE-enhancement – Targets – Rel-11 topics • SummaryNTT DOCOMO, INC., Copyright 2010, All rights reserved. 2
  • Introduction • LTE Rel-10 – Rel-10 discussion on LTE-Advanced is actively on-going to approve the Rel-10 specs by December 2010. • LTE Rel-11 and Beyond – Rel-11 discussion is expected to start from the beginning of 2011 – LTE enhancements and beyond LTE/IMT are gaining interest across the world as standardisation fora and the industry progress toward IMT-Advanced. • ARTIST4G Project • ITU-R WP5D IMT.UPDATE toward WRC-12 and 16 • Time has come to look at possible concept for Rel-11 and beyondNTT DOCOMO, INC., Copyright 2010, All rights reserved. 3
  • Release of 3GPP RAN Specification 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 GSM/GPRS/EDGE enhancementsRelease 99 W-CDMA Release 4 1.28Mcps TDD Release 5 HSDPA Release 6 HSUPA, MBMS Release 7 HSPA+ (MIMO, HOM etc.) ITU-R M.1457 Release 8 LTE IMT-2000 Recommendations Under preparation Small LTE Release 9 enhancements Release 10 LTE-Advanced Release 11 and NTT DOCOMO, INC., Copyright 2010, All rights reserved. beyond 4
  • LTE Rel-10NTT DOCOMO, INC., Copyright 2010, All rights reserved. 5
  • System Performance Requirements for LTE-Advanced • Peak data rate – 1 Gbps data rate will be achieved by 4-by-4 MIMO and transmission bandwidth wider than approximately 70 MHz • Peak spectrum efficiency – DL: Rel. 8 LTE satisfies IMT-Advanced requirements – UL: Need to double from Release 8 to satisfy IMT-Advanced requirements Rel. 8 LTE LTE-Advanced IMT-Advanced DL 300 Mbps 1 Gbps Peak data rate 1 Gbps(*) UL 75 Mbps 500 Mbps Peak spectrum efficiency DL 15 30 15 [bps/Hz] UL 3.75 15 6.75 *“100 Mbps for high mobility and 1 Gbps for low mobility” is one of the key features as written in Circular Letter (CL)NTT DOCOMO, INC., Copyright 2010, All rights reserved. 6
  • System Performance Requirements for LTE-Advanced (Cont’d) • Capacity and cell-edge user throughput – Targets for LTE-Advanced were set considering 1.4 to 1.6 times gain increase from Release 8 LTE performance Ant. Config. Rel. 8 LTE*1 LTE-Advanced*2 IMT-Advanced*3 Capacity DL 2-by-2 1.69 2.4 – [bps/Hz/cell] 4-by-2 1.87 2.6 2.2 x1.4-1.6 4-by-4 2.67 3.7 – UL 1-by-2 0.74 1.2 – 2-by-4 – 2.0 1.4 Cell-edge DL 2-by-2 0.05 0.07 – user throughput 4-by-2 0.06 0.09 0.06 [bps/Hz/cell/u 4-by-4 0.08 0.12 – ser] UL 1-by-2 0.024 0.04 – 2-by-4 – 0.07 0.03 *1 See TR25.912(Case 1 scenario) *2 See TR36.913(Case 1 scenario) *3 See ITU-R M.2135(Base Coverage Urban scenario)NTT DOCOMO, INC., Copyright 2010, All rights reserved. 7
  • LTE Rel-10 Technical Features Rel-10 work items for LTE-Advanced: • Carrier aggregation (CA) • Enhanced downlink multiple antenna transmission • Uplink multiple antenna transmission • Relaying • Enhanced ICIC for non-CA based deployments of heterogeneous networks for LTE (eICIC)NTT DOCOMO, INC., Copyright 2010, All rights reserved. 8
  • Carrier Aggregation (CA) • Wider bandwidth transmission using carrier aggregation (CA) for both DL and UL – Entire system bandwidth up to, e.g., 100 MHz, comprises multiple basic frequency blocks called component carriers (CCs) Satisfy requirements for peak data rate – Each CC can be configured in a backward compatible way with Rel-8 LTE Maintain backward compatibility with Rel-8 LTE • Carrier aggregation supports both contiguous and non-contiguous spectrum, and asymmetric bandwidth for FDD Achieve flexible spectrum usage CC, e.g., 20 MHz System bandwidth, e.g., 100 MHz Examples of UE Frequency capabilities • 100-MHz case • 40-MHz case • 20-MHz case (Rel. 8 LTE)NTT DOCOMO, INC., Copyright 2010, All rights reserved. 9
  • Enhanced Downlink Multi-antenna Transmission • Extension up to 8-layer transmission – Increased from 4 layers in Rel-8/9 Satisfy the requirement for peak spectrum efficiency, i.e., 30 bps/Hz Max. 8 streams • Additional reference signals (RS) specified: – Channel state information RS (CSI-RS) • For downlink channel sounding • Sparse, low overhead (configurable) – Density: 1 resource element (RE) per antenna port per PRB – UE-specific demodulation RS (DM-RS) • UE-specific DM-RS can be precoded, supporting non-codebook-based precoding, applied 1-8-layer transmission, and enhanced multi-user beamforming, such as zero forcing (ZF) • DM RS pattern for higher numbers of layers is extended from 2-layer format for transmission mode 8 in Rel-9 DMRS patternNTT DOCOMO, INC., Copyright 2010, All rights reserved. 10
  • Enhanced Downlink Multi-antenna Transmission (Cont’d) Enhanced Multi-user (MU) MIMO CSI feedback • MU-MIMO dimensionality – Maximum spatial 4 layers – Maximum 2 layers per user Enhanced MU-MIMO • CSI feedback enhancement using two matrix (W1, W2) feedback frame work – W1 targets wideband/long-term channel properties – W2 targets frequency-selective/short-term time channel properties – Matrix multiplication is used. • Dynamic switching between SU/MU MIMONTT DOCOMO, INC., Copyright 2010, All rights reserved. 11
  • Uplink Multi-antenna Transmission • UL transmit diversity for PUCCH to improve robustness in cell-edge – Orthogonal resource transmit diversity is supported for PUCCH format 1 (Scheduling request) 1a/1b (HARQ-Ack), and format 2 (CQI) 2a/2b (CQI+ HARQ-Ack) when UE has two Tx antennas • the same modulation symbol from the uplink channel is transmitted from two antenna ports, on two separate orthogonal resources. • SU-MIMO up to 4-stream transmission to satisfy the requirement for peak spectrum efficiency, i.e., 15 bps/Hz – Closed-loop codebook based precoding supported SU-MIMO up to 4 streams Max. 4 streamsNTT DOCOMO, INC., Copyright 2010, All rights reserved. 12
  • Relaying for LTE • Relay design target for Rel-10 is coverage extension – Supports cell deployments in areas where wired backhaul is not available or very expensive • “Type 1” relay – Inband relaying: same carrier frequency for backhaul and access links – Time division multiplexing of backaul and access links – Relay node (RN) creates a separate cell distinct from the donor cell – UE receives/transmits control signals for scheduling and HARQ from/to RN – RN appears as a Rel-8 LTE eNB to Rel-8 LTE UEs • “Type 1a” relay – Outband relaying: different carrier frequency for backhaul from access link Macro (eNB) Relay node (RN) Backhaul link Access link UENTT DOCOMO, INC., Copyright 2010, All rights reserved. 13
  • eICIC for non-CA based HetNets • Interference coordination for non-CA based heterogeneous networks (HetNet) – Time domain coordination • Extend Rel-8/9 backhaul coordination for macro and pico deployments – Power control • Femto eNB power reduction to avoid inteference to macro UE Macro Macro Femto Femto Pico Pico HetNet with Macro and Pico HetNet with Macro and FemtoNTT DOCOMO, INC., Copyright 2010, All rights reserved. 14
  • LTE Rel-11 and BeyondNTT DOCOMO, INC., Copyright 2010, All rights reserved. 15
  • Future Requirements for Rel-11 and Beyond Market trends Technology requirements • Significant increase in data traffic • Very high network capacity – Driven mainly by video – With significant reduction in cost per bit – Mobile Internet flat-rate tariffs • Higher spectrum efficiency and user- – Spread of smart-phone, data-card for PCs experienced throughput – Requirement for high data rate comparable • Fairness of user throughput with that for fixed Internet – In a cell • Femto cell • Improve cell-edge throughput – Improve capacity and coverage – Among cells – New services for home use (e.g., “My Area” • Urban to rural in DOCOMO) • Digital divide • Ecosystem, Openness – Among users – Radio interface, OS, application • Less system impact from few heavy users • Energy saving • Low CAPEX and OPEX – World wide interest and activities, e.g. • Energy saving EARTH project, activities in SDOs • Scalability and flexibility to optimize • More diverse QoS system for – Increase in diverse data applications incl. – Various environments Machine type communications, Sin Client – Various QoS • Remote Radio Unit via optical fiber • Low end-to-end latencyNTT DOCOMO, INC., Copyright 2010, All rights reserved. 16
  • Evolution Directions • Evolution directions to further enhance network capacity Required network capacity Emerging solutions that need more focus Spectrum efficiency Traffic offloading - Radio access technologies - Offloading strategies tuned including multi-antenna to applications and scenarios transmission and receiver processing techniques Current - All-time issue for researchers capacity Network density and engineers in this area - Technical trend such as heterogeneous deployments - Network architecture to reduce Bandwidth extension cost per bit highly required - Efficient way to reduce cost per bit Conventional approach - Depends on future spectrumfor capacity improvement allocation and UE capabilityNTT DOCOMO, INC., Copyright 2010, All rights reserved. 17
  • Requirements and Techniques • Requirements • Techniques Network density Traffic offloading Higher capacity and New NW architectures/deployments user-experienced throughput and offloading techniques Bandwidth extension Fairness of user throughput Techniques for bandwidth extension & enhanced utilization Low CAPEX and OPEX Spectrum efficiency Energy saving Multiple access and efficient packet access mechanism Scalability and flexibility for various environments and QoS MIMO (increase in number of Tx/Rx antennas) Low end-to-end latency Advanced receiver techniquesNTT DOCOMO, INC., Copyright 2010, All rights reserved. 18
  • LTE Rel-11: Possible Concept • LTE enhancements after Rel-10 – Backwards compatibility is essential • Non-backwards compatible features can be considered (only) if their gain justifies it – Gain-complexity tradeoff in actual commercial network and terminals must be considered – Main focus of LTE Rel-11: • Refinement of Rel-10 for further performance improvement • Features which have been studied but not supported in Rel- 10 due to time limitation • For brand new features targeting beyond Rel-11, e.g., non-backward compatible features, study items can be started during Rel-11 time frame.NTT DOCOMO, INC., Copyright 2010, All rights reserved. 19
  • Candidate Topics for Rel-11 Initial candidates for Rel-11 • CoMP • CA enhancements • eICIC enhancements • Advanced receiver • Relay • MDT enhancements • MBMS enhancements • SON enhancements • MTC enhancementsNTT DOCOMO, INC., Copyright 2010, All rights reserved. 20
  • Coordinated Multiple Point Transmission and Reception (CoMP) • Background – Standard transparent CoMP is supported for Rel-10 – New Study Item (SI) for CoMP will be started. • Technical topics – Deployment scenarios – UE feedback enhancement • Multi-cell CQI measurement and feedback – Control signaling and measurement procedures – UL sounding (SRS) enhancement – (CSI-RS for Rel-10 will be designed to support inter-cell measurement for future CoMP) Gain needs to be verified eNB eNB RRH exampleNTT DOCOMO, INC., Copyright 2010, All rights reserved. 21
  • CA Enhancements • Background – Rel-10 specification supports CA up to 5 CCs – Further refinements could be considered for Rel-11. • Technical topics – Refinements of Rel-10 features, e.g., • CQI feedback for 5 CC (or more) • Reduction of blind decoding at UE – Support for inter-band CA (definition of band combinations) – Support of various deployment scenarios, such as RRH • Support for multiple timing advance for UL CA CC1 CC2NTT DOCOMO, INC., Copyright 2010, All rights reserved. 22
  • eICIC Enhancements • Background – Rel-10 will support power control and time domain ICIC Macro • Technical topics to be studied – Control channel enhancement • Capacity enhancement • Enhanced ICIC and flexibility – Backhaul support (X2) between macro and femto CSG cells • Information exchange between nodes for enhanced ICIC – New UE measurement support – Interference cancellation at UE – Extension of cell selectionNTT DOCOMO, INC., Copyright 2010, All rights reserved. 23
  • Advanced Receiver • Background – Performance requirement for advanced receiver has been specified IRC for HSDPA – Advanced receiver (IRC) is necessary to meet the ITU-R requirements • Typical IRC is MMSE detection using covariance matrix of inter-cell interference • 30-40% gain can be expected by evaluation results – Advanced receiver is also beneficial in HetNet to improve the performance of both control and data • CRS cancellation receiver is a typical example • Topics for Rel-11 – Performance requirement for a simple multi-cell interference rejection receiver should be specifiedNTT DOCOMO, INC., Copyright 2010, All rights reserved. 24
  • Upper Layer Topics • Relay – Mobile relays, flow control, coverage extension (include layer 1 issues) • Minimization of Drive Test (MDT) enhancements – Additional measurement, tighter coupling with LCS • Multimedia Broadcast/Multicast Service (MBMS) enhancements – Service continuity aspects • Self-Optimizing Networks (SON) enhancements – LTE-A/HeNB specific aspects • Machine-Type Communication (MTC) enhancements – RAN overload controlNTT DOCOMO, INC., Copyright 2010, All rights reserved. 25
  • Summary • Market demands and requirements for beyond LTE-A – Alignment with the market demand needs to be considered • LTE-Rel-10 and possible extensions to Rel-11 – CoMP – CA enhancements – eICIC enhancements (HetNet) – Advanced receiver – Relay – MDT enhancements – MBMS enhancements – SON enhancements – MTC enhancements • For beyond Rel-11, brand new features with very big gain are needed to meet long-term requirementsNTT DOCOMO, INC., Copyright 2010, All rights reserved. 26