1. 4G LTETeam 9

2. 4G Standards International Mobile Telecommunications Advances (IMT-A) set by the International Telecommunications Union Radio (ITU-R) All IP packet switchnetwork 1Gbit/s stationary,100Mbit/s moving Scalable channelbandwidth 5-20 MHz 3. LTE Technologies / Features E-UTRA LTEs air interface Transfer capabilities DL and UL schemes Protocol Architecture Spectrum Flexibility Cell size support Network architecture 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. OFDM OFDMSingle Carrier Serial Symbols S1 Wide Frequency S2 Short Symbol TimeS1 S2S3S5 S4Time S3Time S4 S5 Parallel SymbolsFrequency Narrow FrequencyFrequency Long Symbol Time 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 S1S2 S3 S5S4Frequency Time 7. Upstream Modulation SC-FDMA (Single carrier frequency - division multiple access) Lower peak-to-average-power (PAPR) Acceptable performance loss 8. MIMO Multiple Input Multiple Output S1DSP TxRx DSP S2 9. E-UTRA Protocol Stack MAC: HARQ error correction;dynamic scheduling betweenUEs RLC: ARQ error correction;data formatting PDCP: ciphering; errorcorrection during handoff RRC: handles broadcastinformation, security keying NAS: security control;authentication 10. Spectrum Flexibility Allows for cellbandwidth: 1.4 MHz 3 MHz 5 MHz 10 MHz 20 MHz Cell sizes can rangefrom 1-100 km 11. E-UTRA Network Architecture Network consists ofonly evolved-NodeBs eNodeBs consist ofindividual radionetwork controllers,simplifying thenetwork architecture 12. LTE vs 4G Standards All IP packet switch network 1Gbit/s stationary, 100Mbit/smoving Scalable channel bandwidth 5-20MHz 13. FUTURE: LTE AdvancedCircuit + PacketPacket Switching Switching 14. Questions?