LTE Technology with Emphasis on PHY and Air Interface

מק"ט: #11600 | משך קורס: 16 שעות אק'

טכנולוגית LTE למערכות סלולריות, הולכת ומתממשת ברחבי העולם. תהליך התקינה של גרסאות 10-11 הסתיים זה מכבר ומערכות מסחריות נפרסות ברחבי העולם. הצפי הוא שבטווח של 5 שנים יהיו מרבית המערכות הסלולריות בעולם מבוססות LTE. טכנולוגית LTE משלבת מכלול טכנולוגיות תקשורת מתקדמות הן בהיבט של ה- Radio Access והן בהיבט של ארכיטקטורת הרשת.
בקורס יסקרו התכונות העיקריות של טכנולוגית LTE: ובעיקר ממשק האוויר ומימושו בשכבות ה- MACוה-PHY. כמו כן יינתן רקע כללי על גרעין הרשת ותהליכי הקמת ,Session ניידות, תמיכה בשירותי דיבור ו End to End QoS .

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קהל יעד

מהנדסי תקשורת המעוניינים בהכרה מעמיקה של טכנולוגית LTE בעיקר בהיבט של ה- Radio Accessוה-PHY

תנאי קדם

רצוי רקע במערכות תקשורת Wireless


Section 1: Introducing LTE

  • 3GPP Evolution, From R5 to R10, the goals of LTE.
  • Review of the LTE Architecture,
  • interfaces, EPC, MME, S-GW, PDN Gateway, SGSN, IMS.
  • Spectrum and Channel Bandwidths Options
  • End to End Downlink and Uplink IP Data Flow.

Section 2: OFDM/OFDMA in LTE

  • OFDM motivation: spectral efficiency, equalization, bandwidth flexibility, resilience to multipath.
  • OFDM signal structure: subcarriers, orthogonality, the cyclic prefix, OFDM symbols, fundamental period.

Section 3: LTE Downlink Frame

  • LTE generic frame structure, slots and subframes, frequency bands, carrier frequencies and EARFCN.
  • Modulation and Coding, QPSK, 16QAM, 64QAM, Turbo Coding.
  • Downlink physical channel processing chain, scrambling, modulation, layer mapping, precoding.
  • Scrambling and modulation, PRBS initialisation, BPSK, QPSK, 16QAM and 64QAM constellations.
  • Mapping of physical channels and signals to the resource grid, relationship between antenna ports and physical antennas.
  • The control region, Resource Element Groups (REGs), Control Channel Elements (CCEs), PDCCH search spaces, role of CFI.

Section 4: LTE Uplink Radio Frame

  • Principle of SC-OFDMA
  • Scrambling and modulation, BPSK, QPSK, 16QAM and 64QAM constellations.
  • SC-FDMA symbol construction, DFT sizes, uplink resource allocation size restrictions, subcarrier mapping.
  • Uplink reference signals: DRS and SRS, uplink channel estimation problem, SRS structure and timing.
  • Indicator (HI), Scheduling Request (SR).
  • Control signalling on PUSCH, data and control interleaving and multiplexing, ACK/NACK placeholder bits.
  • Control signalling on PUCCH, PUCCH Formats 1, 1a, 1b, 2, 2a, 2b, PUCCH resources, cyclic shifts, resource element mapping.

Section 5: LTE Operational Procedures

  • Logical Channels - BCCH, PCCH, CCCH, DCCH, DTCH.
  • Transport Channels - BCH, DL-SCH, PCH, UL-SCH, RACH.
  • Mapping Logical Channels into Transport Channels - RNTI Identities, random access process, non-contention based random access procedure.
  • The LTE downlink physical channels - PBCH, PCFICH, PDCCH, PHICH, Synchronization and Reference Signals.
  • Contents of RRC MIB and SIB messages, Scheduling Options.
  • PLMN selection and Initial Cell Selection algorithms, Optimization of Parameters.
  • LTE initial procedures, RRC Connection, Signalling Radio Bearers.
  • Attach, PDN connectivity and Default and Dedicated Bearer Establishment.

Section 6: LTE eNB Protocols

  • Defined the use of NAS, IP, RRC, PDCP, RLC and MAC.
  • The E-UTRA Interface, Stratums, NAS Control Plane, NAS User Plane, NAS Messages, EMM Messages and ESM Messages.
  • LTE States, EPS Mobility Management States, EMM States in the UE, EMM States in the MME, EPS Connection
  • Management States.
  • The E-UTRA Protocols, Radio Resource Control, RRC Messages, RRC States, Establishment of an RRC Connection.
  • PDCP services and functions,
  • RLC, RLC Transparent Mode, RLC Unacknowledged Mode and RLC
  • Acknowledged Mode, RLC PDUs, the TMD PDU, UMD
  • PDU, AMD PDU, AMD Segment PDU and the RLC Status PDU.
  • MAC functions and operation.
  • More on PHY
  • OFDM and SC-FDMA Generation
  • Codewords and layers, antenna ports and physical antennas
  • Downlink multi-antenna processing, transmission schemes, layer mapping and precoding.
  • Control information: Channel Quality Information (CQI), Rank Indication (RI), Precoding Matrix Indication (PMI), HARQ

Section 7: MIMO Review

  • Motivation, increased capacity, increased robustness.
  • Multiantenna systems classification, SISO, MISO, SIMO and MIMO. Beamforming, diversity, spatial multiplexing.
  • Transmit and receive diversity, diversity gain.
  • The Alamouti sheme, space time coding, space frequency coding, decoding procedure.
  • Delay diversity and cyclic delay diversity (CDD), relationship with OFDM and multipath.
  • Beamforming, SNR maximisation.
  • Spatial multiplexing, narrowband assumption, channel matrix, channel rank, spatial streams and layers.
  • Precoding and combining in MIMO: Singular value decomposition (SVD), codebook and non-codebook based precoding, signalling overhead.
  • Codebook based precoding, desired codebook attributes, codebook selection, signalling overhead .