Điện tử viễn thông chap 1 STC LTE eNB overview khotailieu

Distribution ED01 English Jae ho, Lee Customer Training Center Contents Intro Network Architecture Multiple Access Frame Structure Multiple Antenna Technique LTE Evolution Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge Intro Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge LTE Definition and History R99 Rel4 WCDMA Rel5 HSDPA Rel6 HSPA Rel7 Rel8 Rel1 HSPA evolution LTE LTE-advanced LTE Background Demand for high-datarates Reduced Latency Enhancement of UTRA & UTRAN Improved system capacity & coverage Reduced cost for the operator UTRA : Universal Terrestrial Radio Access UTRAN: UTRA Radio Access Network Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge Requirements of LTE (1/2) [Ref: TR 25.913] Peak data rate 100 Mbps (DL) / 50 Mbps (UL) Baseline: 20 MHz BW, 1TX & 2RX UE Less than 50msec Dormant (Cell_PCH) Active (Cell_DCH) Significantly reduced latency Control-plane latency – Idle ↔ active : < 100 ms – dormant ↔ Active: < 50 ms Less than 100msec Camped-state (idle) User-plane latency : < ms in unload condition for small IP packet Significantly improved throughput & spectrum efficiency ~ times Release HSPA Spectrum flexibility Scalable bandwidth: 1.4/3/5/10/15/20 MHz Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge Requirements of LTE (2/2) [Ref: TR 25.913] Mobility Optimized for low mobile speed ~ 15 km/h 15 ~ 120 km/h should be supported with high performance Connection maintained at speeds 120 ~ 350 km/h (or even up to 500 km/h) Support for inter-working with existing 3G systems and non3GPP systems Reduced CAPEX and OPEX including backhaul Efficient support of the various types of services, especially from the PS-domain Web-browsing, FTP, video-streaming, VoIP Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge LTE Standard Specifications Free Download from http://www.3gpp.org/ftp/Specs/htmlinfo/36-series.htm Specification index TS 36.100 series Description of contents Equipment Requirements: Terminals, Base stations, and Repeaters Layer (Physical layer): TS 36.200 series Physical channels, Modulation, Multiplexing, Channel coding, etc Layers and 3: TS 36.300 series Medium Access Control, Radio Link Control, and Radio Resource Control TS 36.400 series TS 36.500 series Network Signaling & Interfaces: Architecture, S1, X2 Interfaces, etc UE equipment conformance testing Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge TD-LTE Fundamental LTE FDD A paired frequency band allocation Uplink and downlink selected from different frequency bands LTE TDD Enables use of unpaired frequency bands The same frequency band for UL and DL, divided in time Channel Reciprocity TD-LTE and LTE FDD Difference solely a physical layer manifestation and therefore invisible to higher layers there are no operational differences between the two modes in the system architecture FDD TDD Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge E-UTRA Operating Band FDD - frequency division duplex TDD - time division duplex Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge HARQ and control signaling HARQ ACK/NACK For FDD, the acknowledgement of data received in sub-frame n is transmitted in sub-frame n+4 For TDD, the acknowledgement obviously cannot be transmitted until an uplink sub-frame occurs Multiple UL ACK/NACK Transmission For, DL heavy case, the reception of several downlink sub-frames may need to be acknowledged in a single uplink sub-frame ACK/NACK Bundling - Combines the acknowledgements in time domain from multiple hybrid-ARQ processes ACK/NACK Multiplexing - Combines the acknowledgements in codeword domain from multiple hybrid-ARQ processes Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 10 Synchronization Channel (FDD vs TDD) FDD TDD Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 30 Multiple Antenna Technique Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 31 Multiplexing DL Orthogonal Frequency Division Multiple Access(OFDMA) No Inter Symbol and multipath interference Frequency selective scheduling Far improved MIMO performance • Performance improvement vs WCDMA UL Single-Carrier FDMA(SC-FDMA) No interference between intra cell users Low PAPR(Peak to Average Radio • Simpler receiver implementation • Larger UL cell coverage than OFDMA IDFT: Invers Discrete Fourier Transform DFT: Discrete Fourier Transform S0 S1 S2 ……S10 S11 Freq Freq IDFT IDFT DFT S0 S1 S2 ……S10 S11 Downlink OFDMA S0 S1 S2 ……S10 S11 Uplink SC-FDMA Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 32 DL MIMO Supports 2X2, 4X2, 4X4 MIMOs, rank-r transmission, where r=1,2,3,4 Precoding Operation Codebook-based precoding - Channel sensitive precoding based on UE’s PMI feedback Large-delay CDD based Open-loop precoding - Large delay CDD for robust communications against channel variation PMI: Precoding Matrix Information CDD: Cyclic Delay Diversity h11 h11 Precoder hNM data streams CDD h1M Receiver Precoder data streams h1M hNM Receiver hN hN Precoder feedback W3 Closed-Loop MIMO Open-Loop MIMO Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 33 UL MIMO Antenna selection diversity Multi-user MIMO h11 UE hN UE eNodeB UE Allocate the same resource blocks to Multiple UEs → Improves spectrum efficiency eNodeB h1M hNM Selection of better link antenna (with single TX RF at the UE) → Improves link performance Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 34 LTE Feature Introduction Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 35 Standard QoS Classes Scheduler supports the standardized QoS class indicators (QCIs) QCI Priority PDB PELR 100 ms 10-2 Conversational Voice 150 ms 10-3 Conversational Video (Live Streaming) 50 ms 10-3 Real Time Gaming 300 ms 10-6 Non-Conversational Video (Buffered Streaming) 100 ms 10-6 IMS Signalling 6 300 ms 10-6 Video (Buffered Streaming), TCP-based (e.g., www, email, chat, ftp, p2p file sharing, progressive video, etc.) 100 ms 10-3 Voice, Video (Live Streaming), Interactive Gaming 300 ms 10-6 Video (Buffered Streaming), TCP-based (e.g., www, email, chat, ftp, p2p file sharing, progressive video, etc.) Resource Type GBR Non-GBR 8 … … … QCI: QoS Class Identifier PELR: Packet Error Loss Rate … Example Services operator-specified class PDB: Packet Delay Budget b/w UE and PGW (Soft upper bound) (3GPP TS23.203) GBR: Guaranteed Bit Rate Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 36 SON Feature Overview Rollout of the LTE leads to Rapidly expanding number of Base Stations (new sites) Parallel operation of 2G, 3G and LTE Much higher complexity in network infrastructure and network management (Operation & Maintenance) Self-Organizing Network(SON) aims to configure and optimize the LTE network automatically by Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 37 UE Category LTE UE category data rates Category DL 10 50 100 150 300 UL 25 50 50 75 LTE UE category modulation formats supported Category DL QPSK, 16QAM, 64QAM UL QPSK, 16QAM QPSK, 16QAM, 64QAM LTE UE category modulation formats supported Category 2Rx diversity 2x2 MIMO 4x4 MIMO Assumed in performance requirements across all LTE UE categories Not supported Not supported Mandatory Mandatory Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 38 LTE Evolution Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 39 3GPP Work Plan for IMT-Advanced 3GPP LTE stabilized on March 2009 Schedule of study/work item for LTE-Advanced Early submission: Sep.2008 LTE-Advanced complete technical submission: Jun.2009 Release of Specification of LTE-Advanced: around 1Q 2011 3GPP Target of LTE-Advanced Better performance than IMT-Advanced requirements 2007 2008 2009 2010 2011 3GPP RAN Study Item ITU-R WP5D Work Item Proposals Evaluation Consensus Specification Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 40 Key Technologies for LTE-Advanced Peak Data Rate improvement Support for large bandwidths (up to 100Mhz) - Aggregation of contiguous/non-contiguous carriers) DL MIMO enhancement - Further performance improvement for 4X4 MIMO(LTE baseline 2X2) - 8X8 MIMO is also considered UL SU-MIMO support - Introduce 2X4 or even 4X4 MIMO (LTE baseline 1X2) Sector/cell throughput improvement Advanced DL MU-MIMO with Tx antenna Multi-stream dedicated beamforming Cell edge performance improvement Relay-coverage extension eICIC for deployments of heterogeneous networks Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 41 eICIC Interference coordination for non-CA based heterogeneous network (HetNet) Time domain coordination - Extend Rel 8/9 backhaul coordination for macro and pico deployments Power control - Femto eNB power reduction to avoid interference to macro UE enhanced Inter-Cell Interference Coordination Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 42 Relay for Coverage Extension BS Coverage Area Reason for Relay Coverage Extension Throughput/capacity gain BS MS RS Coverage Area MS Benefits of Relay vs Pico eNB MS Lower cost – no fiber backhaul Flexibility RS MS MS Samsung Confidential Information Official Commitment will be made in a formal form Up to the best of Samsung’s knowledge 43 Thank You! ... Fourier Transform DFT: Discrete Fourier Transform S0 S1 S2 ……S10 S 11 Freq Freq IDFT IDFT DFT S0 S1 S2 ……S10 S 11 Downlink OFDMA S0 S1 S2 ……S10 S 11 Uplink SC-FDMA Samsung Confidential Information Official... L1 L1 L1 L1 LTE- Uu S1-U UE eNodeB S5/S8 a Serving GW SGi PDN GW Control plane Protocol Stack NAS NAS Relay RRC S1-AP PDCP RRC PDCP S1-AP SCTP RLC RLC IP IP MAC MAC L2 L2 L1 L1 L1 L1 UE LTE- Uu eNodeB... Channel Bandwidth, 1Resource Block (RB) = 18 0KHz 1. 4MHz 3MHz 5MHz 10 MHz 15 MHz 20MHz RBs 15 RBs 25RBs 50RBs 75RBs 10 0RBs Modulation scheme Downlink: QPSK, 16 QAM, 64QAM Uplink: QPSK, 16 QAM, 64QAM (optional