4G LTE Presentation Group 9

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4G LTE Presentation Group 9

  1. 1. 4G LTETeam 9
  2. 2. 4G Standards International Mobile Telecommunications – Advances (IMT-A) set by the International Telecommunications Union – Radio (ITU-R)  All IP packet switch network  1Gbit/s stationary, 100Mbit/s moving  Scalable channel bandwidth 5-20 MHz
  3. 3. LTE Technologies / Features E-UTRA – LTE’s air interface  Transfer capabilities  DL and UL schemes  Protocol Architecture  Spectrum Flexibility  Cell size support  Network architecture
  4. 4. Data Rate Peak download rate of 100 Mbit/s Peak upload rate of 50 Mbit/s Low handoff and data transfer latencies (sub 5-ms for small IP packets) How is this achieved?
  5. 5. OFDM OFDM Single Carrier • Serial Symbols S1 • Wide Frequency S2 • Short Symbol Time S1 S2 S3 S5 S4Time S3 Time S4 S5 • Parallel Symbols Frequency • Narrow FrequencyFrequency • Long Symbol Time
  6. 6. Downstream Modulation  OFDMA (Orthogonal frequency-division multiple access)  Multi-user version of OFDM  Achieved by assigning subsets of subcarriers to individual users  Allows simultaneous low-data rate transmission  High power cost Sub-CarriersSub-Carriers S1 S2 S3 S5 S4 Frequency Time
  7. 7. Upstream Modulation SC-FDMA (Single carrier frequency - division multiple access)  Lower peak-to-average-power (PAPR)  Acceptable performance loss
  8. 8. MIMO – Multiple Input Multiple Output S1DSP Tx Rx DSP S2
  9. 9. E-UTRA Protocol Stack MAC: HARQ error correction; dynamic scheduling between UEs RLC: ARQ error correction; data formatting PDCP: ciphering; error correction during handoff RRC: handles broadcast information, security keying NAS: security control; authentication
  10. 10. Spectrum Flexibility Allows for cell bandwidth:  1.4 MHz  3 MHz  5 MHz  10 MHz  20 MHz Cell sizes can range from 1-100 km
  11. 11. E-UTRA Network Architecture Network consists of only evolved-NodeBs eNodeBs consist of individual radio network controllers, simplifying the network architecture
  12. 12. LTE vs 4G Standards All IP packet switch network 1Gbit/s stationary, 100Mbit/s moving Scalable channel bandwidth 5-20 MHz
  13. 13. FUTURE: LTE – AdvancedCircuit + Packet Packet Switching Switching
  14. 14. Questions?

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