Views on Rel-12 and onwards for LTE and UMTS
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  • 1. RAN workshop on Rel-12 and onwards RWS-120006Ljubljana, Slovenia, 11th and 12th June 2012Views on Rel-12 and onwardsfor LTE and UMTSHuawei Technologies, HiSiliconHUAWEI TECHNOLOGIES CO., LTD.
  • 2. Evolution of Mobile Traffic Rapid traffic growth with mobile video as dominant service Major part of traffic occurs in Hotspot and Indoor Scenarios >80% Traffic in Indoor; >50% Traffic at Home Machine Type Communication (MTC) related traffic will gain in importanceHUAWEI TECHNOLOGIES CO., LTD. Page 2
  • 3. Rel-12 Targets and Requirements Higher mobile broadband capacity  Improved spectrum efficiency, in particular for hotspot and indoor scenarios  Efficient support of Heterogeneous Networks with dense Low Power Node (LPN) deployments  Improved spectrum usage General network enhancements  Easier deployment and system operation  Energy efficiency improvement with bit/J/km2 as generic metric  Improvements for diverse devices, applications, and services (smartphones, MTC traffic,…)  Support of efficient backhaul offloadingHUAWEI TECHNOLOGIES CO., LTD. Page 3
  • 4. Proposed Rel-12 Timing Rel-11 Rel-12 Rel-13 2011 2012 2013 2014#52 #53 #54 #55 #56 #57 #58 #59 #60 #61 #62 #63 #64 #65 #66 Rel-11 study Items Rel-11 work Items Rel-11 stage 3 completion Rel-11 ASN.1 freezing Rel-12 study Items Rel-12 work Items Rel-12 Workshop Rel-12 stage 3 completion Rel-12 ASN.1 freezing Rel-12 can be targeted as an 18 months release beginning from September 2012HUAWEI TECHNOLOGIES CO., LTD. Page 4
  • 6. Hotspot and Indoor Enhancements (LTE-Hi)Multi-layer network layout with dense low power nodes (LPN)  Different layers for coverage and capacity Throughput LTE LPN 3.5 GHz Hot spots  Efficient capacity layer at higher frequency bands Urban & Suburban (e.g. LTE 2.6 GHz) e.g. strategic spectrum at 3.5GHz for global Nation wide (e.g. LTE 700/800 MHz) wideband hotspot and indoor accessLPNs optimized and simplified for hotspot and indoor scenarios  Enhanced spectrum efficiency for typical terminal form factors (2 RX antennas): • Peak Spectrum Efficiency: 10 bps/Hz (~25% improvement over LTE-Advanced) • Average Spectrum Efficiency: Up to 50% improvement  Adaptation to local traffic with flexible TDD DL/UL configuration  Interference avoidance in local clusters via synchronized neighbor detection  Efficient use of larger available bandwidth  Stand alone support, e.g. for deep indoor scenariosCoordinated multi-layer operation and management  Throughput aggregation from multiple layers  Macro assistance on small cell layer mobility and traffic steering HUAWEI TECHNOLOGIES CO., LTD. Page 6
  • 7. LTE-Hi: Enhanced Spectrum Efficiency Peak rateSupport of higher order modulation up to 256 QAM achieved at 27 dB  Usable SINR range is roughly above 20 dB  Up to 40% of terminals may benefit from 256 QAM in indoor scenarios (ITU InHome scenario)Overhead reduction  RS overhead (CRS and DMRS) can be reduced in low mobility and wider coherence bandwidth  Control channel overhead can be reduced e.g. by scheduling over multiple sub-frames  Maintain backward compatibility for legacy terminals  Expected savings are 10-15% Usable range for 256 QAMHUAWEI TECHNOLOGIES CO., LTD. Page 7
  • 8. LTE-Hi: TDD Traffic Adaptive DL/UL ConfigurationAdaptive DL/UL configurations based on traffic variation  Isolated cell clusters, e.g. shopping mall, airport, etc.  Heterogeneous networks  Continued work from Rel-11 study phase Hotspot area 2 (UL dominant)Inter-cell interference mitigation is required  Configuration detection of neighbor cells  Alignment of DL/UL configuration within LPN clusters Hotspot area 1 (DL dominant) HUAWEI TECHNOLOGIES CO., LTD. Page 8
  • 9. LTE-Hi: LPN Configuration Detection Motivation  Dynamic cell re-configurations adapt to time-varying traffic load  Autonomous detection allows to quickly react to a changing Detectable Reconfigurable environment and avoid interference between LPNs configuration Dynamic carrier switching Neighbor configuration & TDD DL/UL re-configuration Highly efficient detection mechanism Interference condition  Support detecting LPN configuration by other LPNs and UEs Configuration Detection &  Synchronized detection slot in the frame structure Application  Configuration detection RS and procedure Configuration detection applications  Flexible carrier selection in larger bands (FDD and TDD) Flexible interference avoidance  Flexible DL/UL resource allocation (TDD) Carrier selection DL/UL resource allocation  Flexible power control (FDD and TDD)HUAWEI TECHNOLOGIES CO., LTD. Page 9
  • 10. Multi-Stream AggregationThroughput aggregation from multiple nodes  CoMP and CA solutions so far are limited to intra-site and fast backhaul scenarios  Backhaul with limited bandwidth and higher latency needs to be supported as well  Possibility of separate frequency and shared frequencyEfficient multi-layer operation for LTE-Hi scenario  Coordinated multi-point protocol stack  Coverage layer with macro-node  Handling of mobility and traffic steering  Capacity layer with LPNs  Cluster of LPNs ensuring high data rate  Energy efficient topology adapting to load variation F2 Capacity layer  Fast carrier selection  Increased number of carriers in larger bands F1 Coverage layer  Handling of New Carrier Type  Support of UEs with single RF chain and multiple RF chains HUAWEI TECHNOLOGIES CO., LTD. Page 10
  • 11. Multi-Stream Aggregation Protocol stack split over multiple nodes  Create a local LPN cluster around the UE  Data splitting above MAC layer supports backhaul with various latencies  UE aggregates data streams from multiple nearby LPNs  Radio resources are pooled to form a high speed composite data pipe  Macro-cell handles traffic steering (e.g. based on QoS) and control plane  Possibility of slim protocol stack for LPN (User plane only) Possible Multi-Stream Protocol Stacks Accessory LPN Macro Cell Accessory LPN Macro Cell DRB2 RRC S1CP RRC S1CP DRB1 DRB PDCP PDCP PDCP RLC RLC RLC RLC MAC MAC MAC MAC PHY PHY PHY PHY RB based Packet basedHUAWEI TECHNOLOGIES CO., LTD. Page 11
  • 12. Support of Active Antenna SystemsIncreased spectrum efficiency  Vertical beamforming  Proactive cell shaping  Vertical cell-splitting Vertical cell shapingProposed study areas  3D channel modelling  Reference signal enhancements  Codebook and feedback enhancements  Measurement enhancements for interference Active Antenna coordination in beam domain System  RF requirements (ongoing as SI in RAN4) Vertical beamforming HUAWEI TECHNOLOGIES CO., LTD. Page 12
  • 13. Active Antenna Systems – performance Cell average SE Cell edge SE 6 0,16 +41% 2D BF +43% 0,14 2D BFCell average SE (bps/Hz) 5 3D BF 3D BF Cell edge SE (bps/Hz) 0,12 4 +12% 0,1 3 0,08 0,159 5,00 0,06 0,113 2 3,50 0,087 2,71 0,04 0,086 1 2,42 0,02 0 0 SU-BF MU-BF SU-BF MU-BF Assumptions Expected gain:  3GPP case 1  SU-BF: 12% gain @cell average  SCM with 6° vertical angle spread limited gain @cell edge  Ideal beamforming  MU-BF: 43% gain @cell average  2 column X-polar AAS 41% gain @cell edge  2D: 4 horizontal ports only at baseband  3D: 4 horizontal + 8 vertical ports at baseband HUAWEI TECHNOLOGIES CO., LTD. Page 13
  • 14. Improved Support for MTCLow cost devices Network robustness  Continuation of Rel-11 study on cost reduction management for large number of MTC  Low bit-rate UE category for MTC Devices in R10/11 Network optimization MTC Devices for large number of MTC Impact cost reduction devices in 3GPPNetwork optimization for MTC in R12  Efficient support of large amount of MTC devices with small data transmission Other SA impacts for adaptation of diverse  RRC signalling reduction M2M applications  Efficient physical layer resource usage (e.g. PDCCH/PUCCH/SRS)  Low power consumption for MTC devices  Co-work with SA2 for MTC enhancements HUAWEI TECHNOLOGIES CO., LTD. Page 14
  • 15. Positioning EnhancementsSupport new scenarios for OTDOA  Distributed RRUs in heterogeneous networks  Vertical positioning  Higher terminal speeds  High SNR difference of reference signalsEnhanced OTDOA accuracy  Specific system bandwidths Positioning for distributed RRU scenario  Small bandwidth 1.4 MHz / 3 MHz  Larger bandwidth 15 MHz / 20 MHzHUAWEI TECHNOLOGIES CO., LTD. Page 15
  • 16. LTE Standardisation Roadmap Rel-11 Rel-12 Rel-13 Enh. Spectrum efficiency for Hotspot and Indoor LPN configuration detection Hotspot and Indoor TDD flexible DL/UL ratio adaptation Enhancements Multi-Stream Aggregation Continued work on NCT, ePDCCH, DL-MIMO, CoMP 3D Beamforming with AAS General network Continued work on: MDT, SON, Energy Saving Enhancements Backhaul offloading LIPA/SIPTO, Enhancements for local traffic Continued work on M2M (low cost devices, overhead reduction) Support of diverse Continued work on diverse data applications & smartphones services and devicesHUAWEI TECHNOLOGIES CO., LTD. Page 16
  • 18. Continued Improvement of UMTSUMTS networks and devices will still dominatein medium term  Continued improvement of UMTS is essentialPeak rate enhancements introduced in Rel-11  8 Carrier, DL 4X4 MIMO, UL MIMO + 64QAM  No need for further increase of peak rate in Rel-12/13Improved capacity with Heterogeneous networks in Rel-12  Managing interaction between macro and small cells is crucial  Limit physical layer impacts for backward compatibilityPotential additional areas for Rel-12  Uplink enhancements HUAWEI TECHNOLOGIES CO., LTD. Page 18
  • 19. Improved Support for Heterogeneous NetworksMobility enhancements  Dedicated and shared carrier deployments  Improve Inter-frequency small cell discovery  Avoid PSC (Primary Scrambling Code) confusion Small Cell Mobility with dense small cell deployments  Optimize small cell handover based on UE speed Uplink InterferenceInterference management  Shared carrier deployments  Extension mechanisms for small cell coverage  Improved support of soft-handover in HetNets  Reduced uplink interference Soft Handover HUAWEI TECHNOLOGIES CO., LTD. Page 19
  • 20. Uplink Enhancements Uplink Coverage Enhancement  Rel-11 closed loop transmit diversity  Extend applicability to cell-FACH state and in combination with DC-HSUPA Uplink Capacity Enhancement  Improve E-DCH ressource efficiency by dynamic ressource sharing  Reduced interference from control channel optimisation (HS-DPCCH/E-DPCCH)HUAWEI TECHNOLOGIES CO., LTD. Page 20
  • 21. Thank you !HUAWEI TECHNOLOGIES CO., LTD. Page 21